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Dissertations / Theses on the topic 'LED display'
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1
Dolejší, Miloš. "Řízení barevného grafického LED displeje pomocí FPGA." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-317123.
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This thesis deals with controlling a color graphic LED display using an FPGA. The first half of the theoretical part of this paper describes the properties of the used FPGA, the data source and a principle of controlling an RGB LED display. The second half describes an implementation of pulse width modulation and binary code modulation which enables the control of brightness of the display and of color depth of every sub-pixel. The practical part on the other hand describes the designing and the implementation of this module in the VHDL language. Then it explains the transfer of image data from Blackfin processor to the memory via PPI interface, the subsequent process of reading data from the memory, conversion of the data to a serial format and finally it describes the process of sending the data to the LED controller. The module was realized on the Digilent Atlys development board equipped with the Spartan-6 FPGA and was tested on a 32x20 light panel for the firm Ing. Ivo Herman, CSc.
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Coufal, Miroslav. "Modulární RGB LED displej." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220135.
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The aim of this master’s thesis was the design RGB LED display with Ethernet interface. I created a display module, controlled by a microcontroller ATmega 2560-16AU. These modules can be connected via a serial RS485 standard. Ethernet connection is made via plug-in interface that uses the programmable module Rabbit RCM 3200. I documented a proposal. I tested designed device.
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Powell, Matthew Reid 1980. "Integrated feedback circuit for organic LED display driver." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17967.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.Includes bibliographical references (leaf 65).
Organic LEDs (OLEDs) offer the potential of ultra low power, portable display technology. The chief barrier to their usage lies in producing OLEDs that will emit light at predictable and consistent amplitudes. We propose the use of optical feedback to generate the desired luminosity pixel by pixel. We implement this technique in an integrated silicon chip. The simulation and verification of fabricated integrated circuits with deposited OLEDs validates the utility of the technique.
by Matthew Reid Powell.
M.Eng.
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Lisuwandi, Eko T. 1977. "Feedback circuit for organic LED active-matrix display drivers." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16849.
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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.Includes bibliographical references (leaves 44-45).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
A feedback circuit for an Organic Light Emitting Diode (OLED) based display is proposed and demonstrated. An OLED-based flat panel display is brighter, much lower power, has no viewing angle limitation and potentially cheaper compared to available Liquid Crystal (LC) based displays. Despite these advantages, an OLED-based display is not widely commercialized mainly due to its short practical lifetime. The I-V characteristics of the individual OLED pixels vary over time, temperature and processing-dependent parameters. Moreover, the variation is not uniform across an array of OLED pixels, causing OLED based displays to lose brightness accuracy after a few thousand hours of operation. The proposed feedback circuit is used to compensate for the non-uniformities in the individual OLED characteristics. The resulting display leverages the beneficial aspects of OLED display technology, while maintaining pixel uniformity and grayscale reproducibility. A demonstration system is built proving the feasibility of a flat panel display using direct optical feedback. The feedback loop monitors the output light level using a sensor and adjusts the current fed to the pixels to set the output light power to a digitally set reference level. The system shares a single feedback loop among a number of pixels, saving power and real estate. The demonstration system consists of a 5x5 array of LEDs, a CMOS camera, analog pixel circuitry, driver and feedback loop, as well as a digital controller. The demonstration system also shows the feasibility of time-sharing a feedback loop among a number of output devices.
by Eko T. Lisuwandi.
M.Eng.
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Alderson, David Douglas. "Scalable and flexible large display arrays: A novel approach to the architectural enhancement of a prototype large display array." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/87833/1/David%20Alderson%20Thesis.pdf.
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Large Display Arrays (LDAs) use Light Emitting Diodes (LEDs) in order to inform a viewing audience. A matrix of individually driven LEDs allows the area represented to display text, images and video. LDAs have undergone rapid development over the past 10 years in both the modular and semi-flexible formats.
This thesis critically analyses the communication architecture and processor functionality of current LDAs and presents an alternative method, that is, Scalable Flexible Large Display Arrays (SFLDAs).
SFLDAs are more adaptable to a variety of applications because of enhancements in scalability and flexibility. Scalability is the ability to configure SFLDAs from 0.8m2 to 200m2. Flexibility is increased functionality within the processors to handle changes in configuration and the use of a communication architecture that standardises two-way communication throughout the SFLDA.
While common video platforms such as Digital Video Interface (DVI), Serial Digital Interface (SDI), and High Definition Multimedia Interface (HDMI) are considered as solutions for the communication architecture of SFLDAs, so too is modulation, fibre optic, capacitive coupling and Ethernet. From an analysis of these architectures, Ethernet was identified as the best solution.
The use of Ethernet as the communication architecture in SFLDAs means that both hardware and software modules are capable of interfacing to the SFLDAs. The Video to Ethernet Processor Unit (VEPU), Scoreboard, Image and Control Software (SICS) and Ethernet to LED Processor Unit (ELPU) have been developed to form the key components in designing and implementing the first SFLDA.
Data throughput rate and spectrophotometer tests were used to measure the effectiveness of Ethernet within the SFLDA constructs. The result of testing and analysis of these architectures showed that Ethernet satisfactorily met the requirements of SFLDAs.
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Petra-Kajňák, Daniel. "Optimalizované systémy napájení LED." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413158.
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The paper discusses a design of a matrix LED display for car rear combination lamps and its power supply. It provides basic information about converters, light, and electronics requirements in the automotive industry. The design of individual circuits, printed circuit board, and firmware are analyzed. Predefined animations have safety, practical, and design functions. The innovative solution presents a new level of communication between the vehicle and its environment. The purpose is to increase safety and improve traffic flow.
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Olivier, François. "Etude des caractéristiques électro-optiques de micro-LED GaN pour application aux micro-écrans haute-luminance." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT019/document.
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Le domaine des écrans est en pleine mutation. De nouvelles technologies d’écrans (principalement LCD et OLED) ont remplacé l’écran à tube cathodique du XXème siècle et ouvrent la voie vers de nouvelles fonctionnalités (écran 3D, flexible, transparent). Depuis quelques années, un genre particulier d’écran fait l’objet de nombreuses recherches, notamment pour adresser de nouveaux marchés tels que la réalité augmentée : les micro-écrans. Pour cela, les contraintes technologiques sont fortes. L’écran doit être miniature (quelques millimètres de diagonale) tout en permettant une qualité d’image semblable aux écrans traditionnels. Il doit aussi être compact, économe en énergie et très lumineux. Une nouvelle technologie d’écran est à l’étude depuis quelques années et doit permettre d’atteindre ses spécifications. Il s’agit des micro-écrans LED, constitués d’un réseau de LED micrométriques, dans lequel chaque diode constitue un pixel de l’image. L’objectif de cette thèse est d’étudier les spécificités des matrices de LED en nitrure de gallium (GaN) en vue de leur utilisation dans des micro-écrans.Les recherches menées au cours de cette thèse portent sur trois axes d’étude. Le premier concerne l’optimisation du rendement à travers l’étude du procédé de matriçage d’une épitaxie LED. L’amélioration de la métallisation P et de l’intégrité électrique du P-GaN a permis d’augmenter le rendement d’un facteur 10 sur les micro-LED. Le deuxième axe de travail concerne l’étude des effets de taille. La réduction de la taille des LED entraine une forte baisse du rendement maximum. Les études menées ont permis l’attribuer principalement à des recombinaisons non-radiatives sur les bords de pixel. Le troisième axe de recherche porte sur l’étude des micro-LED en tant que réseau bidimensionnel permettant la formation d’images. Les principales sources d’inhomogénéité et de dispersion ont été étudiées. Des solutions ont été proposées pour éliminer le cross-talk optique et améliorer l’extraction lumineuse, principal frein au rendement de nos micro-LED. Enfin, des micro-écrans LED fonctionnels, bleus et verts, à l’état de l’art mondial ont été obtenus et caractérisés au cours de cette thèseThe display industry is facing a fast transformation. New technologies (mainly LCD and OLED) have faded-out the cathode ray tube of the 20th century and lead to new applications (3D, flexible and transparent displays). A very particular type of display has recently emerged to address new markets, such as augmented reality: micro-displays. They can be defined as having a diagonal of around 1 inch or less. One important goal of these micro-displays is to deliver the same image quality as conventional, larger-size displays. Strong challenges arise in terms of definition, compactness, consumption and brightness. To address these, LED micro-displays are currently being studied. In a LED micro-display, a 2D-array of micro-LEDs is fabricated, where each LED acts as a single pixel of a whole image. The main objective of this thesis work is to study the specifics of Gallium Nitride (GaN) micro-LEDs arrays for micro-display applications.Our investigations have been carried out focusing on three major areas of study. Increasing LED efficiency through the study of our fabrication process was the first goal. By improving P metal and enhancing P-GaN electrical performances, we were able to increase efficiency of micro-LED by a factor of 10.The influence of size-reduction on the performances of LEDs have then been thoroughly investigated. As LED size decreases, its maximum efficiency drops. Non-radiative recombinations occurring at the edges of the LED were found to be the main origin. We have then studied LEDs, not as a single diode, but as a dense 2D array of micro-LEDs allowing image display, and optical and electrical spread have been investigated. Furthermore, optical cross-talk has been studied and fabrication was changed to address this issue. New structures have also been suggested to improve light extraction efficiency, which is one of the main hindrance towards high-efficiency micro-LEDs. Finally, state-of-the-art, blue and green, active matrix micro-LED displays have been obtained and characterized during the course of this thesis work
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Karmazín, Michal. "Elektronický informační štítek." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218693.
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This master thesis deals with design and construction of the electronic information card. Display consists of 8×32 LED matrix in a modular form which is soldered to the mainboard via edge. In the thesis there are described available circuit solutions, realization, technological description of connection between display module and mainboard and measurements made for verification of parameters.
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Wang, Lulu. "Virtual imaging system." Click here to access this resource online, 2009. http://hdl.handle.net/10292/668.
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The main purpose of this research project was to implement a combination of computer graphics and processing to generate displays that will aid in the visualization of the colour rendering properties of a range of light sources, including the new generation of high-output LEDs (light emitting diodes) that are becoming widely adopted in general lighting service. The CIE (International Commission on Illumination) has developed a colour appearance model CIECAM02 for use in colour imaging and colour management, and this model is utilized in this work. This thesis describes the design and construction of a computer-based model that can be used as a research tool for the simulation and demonstration of the colour rendering properties of various artificial light sources. It is a comprehensive study of the colour models and measurement procedures currently in use in the lighting industry, as recommended by the CIE. This research project focused on the display of a set of surface colour patches as if they were illuminated by a specific light source, and the simultaneous display of two such sets to demonstrate the surface colour differences arising from the use of the two different light sources. A VIS (virtual imaging system) has been developed to display the colour properties of a series of test colour samples under different light sources. This thesis describes the computer models developed for the representation and display of surface colours in general, and colour rendering in particular. The designed system computes and displays the colour of each sample from a knowledge of the light-source spectrum and the spectral reflectance of each surface. It can simultaneously display the colours resulting from illumination by two different sources. In addition, the system computes the colour appearance differences for two sets of colours using the CIECAM02 colour appearance model. Subjective and objective tests were taken to validate the computed results. The VIS has been designed and implemented. It also has been tested by 21 observers and we believe that it will be a powerful research tool for the lighting industry, especially in relation to colour rendering.
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Kim, LeeAnn. "Deposition of colloidal quantum dots by microcontact printing for LED display technology." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37207.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.Includes bibliographical references (p. 81-84).
This thesis demonstrates a new deposition method of colloidal quantum dots within a quantum dot organic light-emitting diode (QD-LED). A monolayer of quantum dots is microcontact printed as small as 20 ,Lm lines as well as millimeter scale planes, and the resulting devices show quantum efficiencies as high as 1.2% and color saturation superior to previous QD-LEDs'. Through a modification of the polydimethylsiloxane (PDMS) stamp with a parylene-C coating, quantum dots solvated in chloroform were successfully inked and stamped onto various substrates, including different molecular organic layers. The ability to control the placement and the pattern of the quantum dots independently from underlying organic layers provides a new level of performance in QD-LEDs, increasing the possibility of QD-LED displays.
by LeeAnn Kim.
M.Eng.
11
Lamba, Kartik S. "An integrated circuit for feedback control & compensation of an organic LED display." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36801.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.Includes bibliographical references (p. 55-56).
Organic LEDs (OLEDs) have the potential to be used to build large-format, thin, flexible displays. Currently, the primary drawback to their usage lies in the difficulty of producing OLEDs which emit light at a constant and predictable brightness over their lifetime. A solution has been proposed which uses organic photo-detectors and optical feedback to control the desired luminosity on a per-pixel basis. This thesis demonstrates the design and fabrication of an integrated silicon control chip and an organic pixel/imaging array, which together form a stable, usable display. The simulation, verification, and testing of this OLED display demonstrates the utility of our solution. In particular, this thesis focuses on the Loop Compensator silicon design and feedback aspects of this circuit. The results demonstrate that the Loop Compensator has the desired DC and frequency characteristics with a measured gain of 100.2 and a variable dominant pole located at digitally-selectable frequencies (using a programmable capacitor array) of 10.8 Hz, 13.5 Hz, 22.8 Hz, and 64.8 Hz, given a clock frequency of 20 kHz.
by Kartik S. Lamba.
M.Eng.
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Xavier, Dominic Michael. "Development of a large scale flexible LED display matrix for the screen industry." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/62065/1/Dominic_Xavier_Thesis.pdf.
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This project addresses the viability of lightweight, low power consumption, flexible, large format LED screens. The investigation encompasses all aspects of the electrical and mechanical design, individually and as a system, and achieves a successful full scale prototype. The prototype implements novel techniques to achieve large displacement colour aliasing, a purely passive thermal management solution, a rapid deployment system, individual seven bit LED current control with two way display communication, auto-configuration and complete signal redundancy, all of which are in direct response to industry needs.
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Zemánek, Petr. "Modulární RGB LED displej s rozhraním Ethernet." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220700.
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This thesis deals with an electronic circuit and a PCB of a modular RGB LED display with the Ehernet interface. Firstly, author describes a RGB colour model, features of RGB LED displays, ways of control them. The next chapter contains a short description of the Ethernet interface, UDP and TCP protocols and a lwIP TCP/IP stack. The last theoretical chapter is an introduction to ARM Cortex-M3 and Cortex-M4 based microcontrollers. The next chaper is deals with a hardware design of the modular RGB LED display. The device is designed to be modular. Individual devices can be combosed together and create a larger display. Data from the Ethernet interface will be displayed on the RGB LED matrix, resolution of the matrix is 32 × 32 (1024 diodes). A refresh frequency is 100 Hz, a color depth is High color (16 bits) and a scanning 1/16 (two rows is driven at the same time). The next chapter describes the firmware for the RGB LED display, all its logical parts including a web page. Author also created the PC application, which sends pictures using UDP protocol to individual modules.
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Pivoňková, Dagmara. "Slovinské národní divadlo v Lublani." Master's thesis, Vysoké učení technické v Brně. Fakulta architektury, 2009. http://www.nusl.cz/ntk/nusl-215637.
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The plot for a new theater is in historic centre of Ljubljana and it is defined by block of existing buildings. I designed theatre with 3 variable scenes – one for 500 spectators, two for 100 people each. In addition i propose the theatre square – big exterior arena. The proposed building is an ending of urbanictic axe, that is why it has shape of monumental gate. The gate is oriented to the south, so i covered the fasade with huge fotovoltaic sreen, that is collecting electric energy during the day and shining this energy out during the night as a big city culture screen..
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Šafář, Viktor. "Elektronický informační štítek." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219279.
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Tato diplomová práce se zabývá návrhem elektronického informačního štítku, jehož základem je maticový LED displej. V teoretické části jsou probrány použitá rozhraní a periferie mikrokontroléru a PC a diskutuje se nad možnostmi kódování českých znaků. Dále se probírá krok za krokem návrh zařízení. Nejdříve jsou vytyčeny hlavní požadavky a funkcionalita zařízení, následuje výběr vhodných komponent a je navrženo elektrické schéma. Jádrem zařízení je mikrokontrolér Microchip PIC, pro který je dále navržen program. Nakonec je popsána a naprogramována aplikace pro MS Windows, která se se zařízením komunikuje.
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Кірєєв, Сергій Русланович, and Serhii Kirieiev. "Пристрій для догліду за кімнатними рослинами на arduino." Thesis, Національний авіаційний університет, 2021. https://er.nau.edu.ua/handle/NAU/50171.
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Language Reference of Arduino [Електронний ресурс]. – Режим доступу:
https://www.arduino.cc/reference/en/
2.ESP8266 Arduino Core’s documentation [Електронний ресурс]. – Режим доступу:
https://arduino-esp8266.readthedocs.io/en/latest/
3. Mini-Tech [Електронний ресурс]. – Режим доступу: https://www.minitech.com.ua/
4.Студентське конструкторське бюро "Sky" при кафедрі електроніки,
робототехніки і технологій моніторингу та інтернету речей [Електронний ресурс]. –
Режим доступу: http://kafelec.nau.edu.ua/Student%20Design%20Office%20Sky.htmlКожна рослина потребує догляду, але інколи ми можемо забути про те що потрібно її поливати. Розроблений нами пристрій, може допомогти вам у догляді за рослиною, нагадуючи про те що її треба полити та тримати в комфортних умовах. В майбутніх розробках цей пристрій буде відслідковувати стан рослини, чи вистачає їй сонця, чи комфортна температура для рослини, чи вистачає рослині вологи, і т.д. Якщо одне з перелічених не буде відповідати нормі, пристрій вам про це повідомить. Також буде реалізований автополив.
Every plant needs care, but sometimes we can forget about that it needs to be watered. The device we developed can help you in care of the plant, reminding that it should be watered and kept in comfortable conditions. In future developments, this device will monitor the condition of the plant, whether it has enough sun, whether a comfortable temperature for the plant, whether it is enough plant moisture, etc. If one of these does not meet the norm, the device notifies you. Auto-watering will also be implemented.
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Seauve, Yoann. "Exploration, conception et mise en œuvre de circuit de pilotage pour micro-écrans à LED GaN." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT069.
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Les avancées récentes dans le domaine de la fabrication de LEDs Inorganiques permettent la production de LEDs GaN à l’échelle micrométrique. Ces composant optiques, jusqu’ici produits uniquement dans des dimensions importantes, peuvent être associés à un circuit de pilotage CMOS afin de produire des micro-écrans. Les micro-LEDs produites en GaN offrent une luminance maximum et une vitesse de commutation bien supérieures aux autres technologies LEDs généralement utilisées à l’échelle micrométrique. Cependant, elles présentent aussi des caractéristiques électriques spécifiques, telles qu’une efficacité réduite et une dispersion de fonctionnement accrue pour une utilisation sous un faible courant. Ainsi, les méthodes de pilotage couramment utilisées avec d’autres technologies LED s’avèrent peu adaptées.Cette thèse a pour objectif le développement de circuits de pilotage pixel adaptés aux micro-LEDs GaN, autant par le type de pilotage mis en place que par un encombrement compatible avec la surface des LEDs employées. Une première partie des travaux porte sur les applications d’affichage, avec une matrice de pixels compacte exploitant la forte luminance des LEDs, tout en présentant une grande résolution. L’utilisation d’un pilotage de type PWM, avec un fonctionnement intermittent des LEDs sous un fort courant, est retenu en raison des spécificités électriques de ces dernières. Afin de maintenir des dimensions réduites pour ce circuit pixel malgré la relative complexité du pilotage mis en place, une construction en 3D du circuit est présentée. Un dérivé de la technologie 3D CoolCube développée au CEA Leti est envisagé afin de construire un micro-écran sur trois niveaux superposés. Le circuit de pilotage est réparti entre les deux premiers niveaux, constitués de circuits CMOS implémentés avec des transistors de natures différentes. Tandis que les LEDs GaN constituent le troisième niveau de l’assemblage.La seconde partie des travaux est orientée vers l’exploitation du temps de commutation réduit des LEDs GaN. Cette capacité à générer un signal optique de fréquence élevée s’avère particulièrement intéressante pour la réalisation de systèmes de communication optique. Plusieurs émetteurs de communication optique en champ libre, utilisant une LED GaN pour réaliser des transferts de données avec un débit de plusieurs Gb/s, sont présentés dans la littérature. Ces systèmes mono-LED, bien que rapides, s’avèrent complexes à mettre en œuvre et particulièrement encombrants. Des émetteurs utilisant une multitude de LEDs, émettant chacune une fraction du signal optique utilisé pour la transmission, constituent une implémentation alternative. Bien que les transmissions réalisées avec ce type d’équipement restent pour l’instant plus lentes, les émetteurs matricés s’avèrent beaucoup plus compacts. Le développement d’un circuit pixel binaire, permettant la commutation d’une LED entre les deux seuls états, allumé et éteint, est présenté. Grace à un mécanisme de compensation de la capacité parasite induite par la LED, ce circuit atteint une fréquence de commutation de 333 MHz. Enfin, une réflexion quant à l’organisation d’un ensemble de ces pixels au sein d’un émetteur matricé, amène à un contrôle thermométrique des différents pixels. La répartition des LEDs à allumer en fonction du code d’entrée qui en découle permet en effet d’assurer la monotonicité de la conversion réalisée, et offre une linéarité accrue par rapport à d’autres modes de décodages plus simples d’implémentationRecent advances in the field on inorganic LEDs, allow for manufacturing of GaN LEDs at micrometer scale. These optical devices, which were initially only manufactured with large dimensions, can be associated to a CMOS driving circuit to form micro-displays. GaN based micro-LEDs offer a maximum brightness and a commutation speed, well above other LEDs technologies used at micrometer scale. However, they also have specific electrical characteristics, such as reduced efficiency and large dispersion of behavior, when used with a reduced current. Consequently, driving methods commonly used with other types of LEDs are not appropriate for the control of such devices.This thesis focusses on the design of pixel driving circuits suitable for micro GaN LEDs, both in terms of implemented driving method and footprint compliance with the size of used LEDs. The first part of this work focusses on display applications, with a compact pixel matrix exploiting LEDs high brightness, while offering a large resolution. A PWM driving scheme, which implies sporadic operation of the LEDs under high current, is chosen to deal with LEDs specificities. In order to insure low silicon footprint despite the relatively high complexity of PWM driving, a 3D manufacturing of the circuit is introduced. A derivative of the CoolCube 3D technology that is developed by CEA Leti, is considered to manufacture a micro-display on three superposed levels. The driving circuit is split between the two first levels, made a CMOS circuit with different types of transistors. An array of GaN LEDs form the third level for the display.The second part of this thesis focusses on exploiting the reduced commutation time of the GaN LEDs. The ability to generate a high frequency optical signal is appropriate for building visible light communication emitters. Several free space optical communication emitters reported in the literature use a single GaN LED to transmit data at several Gb/s. Although, these single LED emitters are very fast, they are cumbersome and complex to build. Other emitters, based on a group of LEDs each emitting a part of the optical signal, forms an alternative solution. Even though data transmission is currently slower using these emitters, matrix based emitters are much more compact. This work introduce the design of a binary pixel, which make the LED switch between its two possible states, ON and OFF. Thanks to a LED introduced parasitic capacitance compensation method, this circuit reaches a 333 MHz operation frequency. Finally, a study of the best pixels organization inside the array led to a thermometer type of pixel control. The resulting association between each input code and the activated pixels insures the conversion monotonicity. It also shows a better linearity than other matrix control schemes with simpler implementations
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Cepl, Miroslav. "Návrh a realizace ovladače LCD displaye pro Raspberry Pi." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-220548.
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The aim of the course work is to design and implement a driver for touchscreen LCD display. The premise of the connection the display to the microcontroller using the I2C bus and use MCP23017 circuits. Raspberry Pi B + will be used for communication with circuits MCP23017 via I2C bus. Display TFT_320QVT will be connected to the outputs of extension circuits MCP23017. Part of the display complete is also a touchscreen with XPT2046 controller. Raspberry Pi runs on Raspbian system based on the Debian Linux distribution. The driver will serve to communicate and display information on the screen. The complete will be useable for applications such as selecting settings and show main information on the display.
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Růžička, Jakub. "Zpracování signálu obrazových senzorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-221025.
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This diploma thesis deals with an image capturing by a CMOS image sensor and controlling of graphical LCD displays using specialized integrated circuits. A theoretical research on the topic and design of the system designed for ease of processing, transmitting and still images displaying based on this research is described in this work. The output of the work is complete the device realized.
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Nevoral, Jan. "Ovládací panel s dotykovým displejem." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-234988.
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The aim of this work is to design and construct a printed circuit board with touchscreen connection that will serve as a universal platform for controlling a variety of devices including industrial devices. The functionality of the board is demonstrated on control of gas boiler application. The first part attends to currently used and available graphic displays, touchscreens, communication interfaces and microcontrollers that allow control of a graphic display. The main focus is put on LCD TFT displays, resistive touch panels and microcontrollers with LCD TFT controller. The second part describes the selection of system components, design of printed circuit board and implementation of thermostat. The end of the work evaluates the produced device and discusses possible future extensions.
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Bartošík, Vladislav. "Řízení grafického OLED displeje mikrokontrolérem Atmel." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218559.
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This Master's thesis deals with design and a realisation of a device controlling an OLED display, Densitron DD-25664-1A. This display has a resolution of 256 x 64 pixels and allows displaying of 4-bit grayscale. The proposed utility software implements the initialization and termination functions, two sets of fonts { Latin and Greek letters and functions for rendering graphics and text. The result of the project is a device with the controlling software.
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Pagáč, Radek. "Modernizace klimatizační komory." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228600.
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The target of this work is to modernize air-conditioning control of the unit Thermal Chamber. The old air-conditioning unit will be renewed by replacing old one by new one, microcontroller-driven control unit, trough which it will be possible to show the current and desired temperature LCD. Theoretically description of the components and methods of measuring the temperature and environment for the creation of the microcontroller is shown before construction.
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Pajskr, Jaroslav. "Přídavný displej LCD k laboratornímu přípravku s programovatelným obvodem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217668.
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The main part of the digital application is its user interface. Users can check the status of the programme or change its state. There are many ways to obtain a suitable interface. During the design stage the simplest interface is chosen that provides the necessary functions. In most cases the interface contains a display. This diploma thesis deals with the design of an extension board to plug in a display to a programmable device, a control algorithm for the display and the design of a simple display interface. There are two ways to design software. The first of them is achieved by the processor PicoBlaze, which contains all the required functions. The second solution is by the state machine written in VHDL language. Both solutions can be used in the same way, but the latter solution is quicker and requires less hardware resources.
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Isaacson, Matthew David. "Using new tools to study the neural mechanisms of sensation : auditory processing in locusts and translational motion vision in flies." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/288741.
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This thesis describes work from both the University of Cambridge in the lab of Berthold Hedwig and from the HHMI Janelia Research Campus in the lab of Michael Reiser. At the University of Cambridge, my work involved the development and demonstration of a method for electrophoretically delivering dyes and tracers for anatomical and functional imaging into animals that are not amenable to genetic labelling techniques. Using this method in locusts and crickets - model systems of particular interest for their acoustic communication - I successfully delivered polar fluorescent dyes and tracers through the sheath covering the auditory nerve, simultaneously staining both the peripheral sensory structures and the central axonal projections without destroying the nerve's function. I could label neurons which extend far from the tracer delivery site on the nerve as well as local neuron populations through the brain's surface. I used the same method to deliver calcium indicators into central neuropils for in vivo optical imaging of sound-evoked activity, as well as calling song-evoked activity in the brain. The work completed at the Janelia Research Campus began with the development of a modern version of a modular LED display and virtual reality control system to enable research on the visual control of complex behaviors in head-fixed animals. The primary advantages of our newly developed LED-based display over other display technologies are its high-speed operation, brightness uniformity and control, precise synchronization with analog inputs and outputs, and its ability to be configured into a variety of display geometries. Utilizing the system's fast display refresh rates, I conducted the first accurate characterization of the upper limits of the speed sensitivity of Drosophila for apparent motion during flight. I also developed a flexible approach to presenting optic flow scenes for functional imaging of motion-sensitive neurons. Finally, through the on-line analysis of behavioral measures, image rendering, and display streaming with low latency to multi-color (UV/Green) LED panels, I demonstrated the ability to create more naturalistic stimuli and interactive virtual visual landscapes. Lastly, I used this new visual display system to explore a newly discovered cell-type that had been implicated in higher-order motion processing from a large genetic screen of visually-guided behavior deficits. Using genetic silencing and activation methods, and by designing stimuli that modeled the optic flow encountered during different types of self-motion, colleagues in the Reiser lab and I showed that this cell-type - named Lobula Plate Columnar 1 (LPC1) - is required for the stopping behavior of walking flies caused by back-to-front translation motion but is not involved in the rotational optomotor response. Using calcium imaging, I found that LPC1 was selectively excited by back-to-front motion on the eye ipsilateral to the neuron population and inhibited by front-to-back motion on the contralateral eye, demonstrating a simple mechanism for its selectivity to translation over rotation. I also examined an anatomically similar cell type - named Lobula-Lobula Plate Columnar type 1 (LLPC1) - and found that its selectivity results from a similar but opposite calculation for the detection of front-to-back translational motion. The detection of back-to-front motion had previously been hypothesized to be useful for collision avoidance, and this work provides a neural mechanism for how this detection could be accomplished, as well as providing a platform from which to explore the larger network for translation optic flow.
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Frecer, Petr. "Radiokomunikační monitor pro ISM pásmo 868 MHz." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219885.
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This thesis deals with the design and the realization of the radiocommunication monitor for the 868 MHz band. In the thesis, a description of licence-free radio bands complying ITU recommendations and ETSI standards is given. A special attention is paid to the 863 MHz - 870 MHz band. The transceiver CC1020 that forms the base for the monitor is described in detail. The circuit design, the monitor assembly and the firmware creation are presented step by step. The radiocommunication monitor is portable and battery powered. The monitor is able to display RF signals in the 868 MHz band, to indicate the frequency error of the transmitter and to receive FSK modulated signal. Demodulated data can be transferred to the personal computer via the USB.
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Klubal, Ondřej. "Grafická knihovna pro dotykový LCD." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236534.
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This work deals with description of graphic library for a touch screen educational kit with a microcontroller from Freescale. Part of this library is a driver that accelerates gradient rendering and supports reading from video RAM. The library allows inserting images with transparency and their upscaling. Multiple fonts are also supported. Fonts can be upscaled and their weight can be set.
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Vazirian, Marjan. "Colour characterisation of LCD display systems." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20850/.
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The main purpose of this research is to study the colour characterisation of digital display systems. Three distinct models for characterisation (GOG, PLCC and PLVC) are evaluated and compared and for two of these models (GOG and PLCC) two different sets of linearisation samples (either colour-ramps or grey-ramp samples) are used to perform the linearisation. To evaluate these models’ colorimetric measurements are made for 20 different display devices and colour characterization performance is reported as the main measure. Characterisation performance is calculated using several sets of samples including the widely used Macbeth ColorChecker chart and two new charts called Chart4 and Matlab60 (one of which was based on a method previously published by Cheung and Westland and another was based on a new method). A key aspect of this work is that all 256 levels of intensity were measured for the colour-ramps and for the grey-ramp linearisation samples for each of the 20 displays to allow subsampling of these data to explore the effect of the number of linearisation samples on characterisation performance. When the number of linearisation samples used was small (less than 10) the GOG model sometimes resulted in the smallest characterisation colour differences. However, for the PLCC and PLVC models performance tended to increase with the number of linearization samples and both of these models outperformed GOG with more 10 linearisation samples. For the PLCC model, better performance was usually obtained using the grey-ramp linearisation samples rather than using the colour-ramps linearization samples. It was possible, for each of the 20 displays, to reach average ab values that are less than 1.5 (ab <1.5, 90%) or ab < 1.0 (75%); however, the model that yields the best performance is difficult to ascertain in advance (a good strategy would be to evaluate all five models and select the one that performs best for the characterisation of any particular display). However, in the majority of cases, lowest colour differences (ab) were obtained using the PLCC model and all 256 of the grey-ramp samples for linearisation. This work has compared the performance of five different models using a large number of displays and has allowed a number of recommendations to be made about display characterisation. Although the majority of the work in this thesis was based on stationary displays the effect of motion on characterization performance was also explored. This is important since moving images are now commonplace in many applications. The results showed that a moving background has a small, but statistically significant, effect on the colour of patches.
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JU, HSISH CHENG, and 謝政儒. "Digital Solar cell LED display System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/63697719529144132591.
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碩士南開科技大學
電機與資訊工程研究所
98
The thesis presents the design a Digital Solar cell LED display System. The proposed system consists of a photovoltaic module, DC/DC power converter, LED display module and a battery。In the thesis, photovoltaic module,MPPT(Maximum Photovoltaic Power Tracker),Software battery charging methods are analyzed。 This tracking rule is using Incremental conductance method as a base, Solar cells using feedback of the output voltage and current changes in the volume, as well as the solar cell of the conductivity value of the moment. To determine the location of the current work points to determine changes in the direction of the next。A microprocessor PIC16f917 is used in the system, Software programs with the construction of a solar cell maximum power tracking。When the sun light and temperature conditions substantially change.. The tracker can rapidly track the maximum photovoltaic power point. Make solar cells under illumination in a variety , Can have a maximum power output. This paper provides experimental results to verify the development of solar cell LED display subtitles and feasibility of the performance of the system。
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Yu, Chih-Wei, and 游志偉. "Optimizing Product Portfolios for LED Display." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/40572722929594559978.
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碩士國立交通大學
管理學院工業工程與管理學程
102
Owing to the raising awareness of environment protection in recent years, the demand of LED (light-emitting diode) displays strongly grows to replace the traditional lamps. Numerous companies significantly expand production capacities to result in the situation that supply is over demand. Thus, the prices of LED products are gradually declining. In order to mitigate this imbalance between demand and supply, one of the best blue-ocean strategies among numerous competitors is seeking and extending more application fields on LED displays. LED displays are controlled through changing LED components to result in combinations of three colors, namely, red, green, and blue. Due to technology breakthrough in technology in the white-light LED, the whole market has been pushed from switching among different colors to multi-color applications. In addition, rising demands on big displays, colorful message reminding, and real-time information communication strengthen the key roles of LED displays and further drive them to replace the traditional advertising business models. As we know, there are numerous LED manufacturers in Taiwan, ranging from the upstream to the downstream. In order to survive in a fast-growing market, companies need to reconsider and reposition their product strategies to face numerous competitors. For instance, determining the optimal production scales with consideration of maximizing profit margins and constrained resources (i.e. machine hours, materials, labor forces, and etc.) is a key issue in this field. Specifically, this dissertation combines linear programming with the theory of constraint (TOC) to accomplish the aforementioned goal. Experimental results show that the presented method in optimizing product portfolios can not only significantly improve the profitability of a company but also control the increase of the WIP (work in process).
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Lo, Chi-Kang, and 羅際慷. "A research of LED display image quality." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/4bd5gj.
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碩士國立交通大學
電機學院電子與光電學程
107
In this study, we aim to improve the image quality of the LED display from the system point of view since the LED displays have been gradually prevailed into the indoor application. Especially, the driving mechanism switch from static driving to time-multiplexing structures would easily result in several significant problems that people would easily observe. There are seven main issues required to be addressed, including: upper ghosting, lower ghosting, low gray scale color shift, first scan line dim, LED open cross mark, LED short column always on and high low gray scale coupling. Improvement of LED drivers and switching MOS driving capability do not only work for analog part, but now the digital part also needs to support the new data structure to fulfill the image quality people require to view.
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WU, CHIA-HAO, and 吳家豪. "LED Color Display Research On Red、Green Phosphor triggered by Blue LED." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/d7c7g7.
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碩士國立臺南大學
電機工程學系碩博士班
107
In this paper, using Solidworks to drawn a mask, and then printed on a 3D printer and bonded to a transparent glass substrate to produce a pixel of a three-primary light-emitting display. With different phosphor powder concentrations, click on the specified block to create RGB three-color light, which is the pixel of the display. Integrating the spheres to measure the spectrum of the blue LEDs of the excitation source, and collecting the values of the intensity of the excitation source, and then measuring the blue wavelengths of the different concentrations of red and green phosphors and their own wavelengths after being excited by blue light by integrating spheres, respectively. The value of the luminous intensity changes, and then the characteristics of the fluorescent powder are discussed. Then, the blue light-emitting multilayer film is designed to remove the blue light of the display to enhance the color gamut. This research is applied to the application of color LED display.
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馬楷杰. "Application of Interactive LED based Visual Transmission Display." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/45304702670760009804.
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碩士建國科技大學
電機工程系暨研究所
98
This thesis is concerned about the design and implementation of interactive LED based visual transmission display technique. Traditional LED display is designed for sending information of specific purpose, such as advertisement, instruction, and decoration. In this work, a one-way interactive display system was proposed, in which RF transmission technique was used to transfer the message between sender and receiver. As in the case of supermarket’s customer services, available clerk might trig a RF signal displaying the unoccupied counter ready to serve next customer on a large LED panel or TV screen, while people waiting on the rest couch or check-out area. A commercial grade RF set was adapted to complete the test circuit and control of LED display array. This thesis has clearly demonstrated the potential of the proposed interactive LED display technique and its extended two-way interactive features.
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Chen, Mau-Tang, and 陳楙棠. "Development of 3D Large-Scale LED Display System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/29198607882801092179.
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碩士明道大學
光電暨能源工程學系碩士班
101
The aim of this study is to develop large scale autostereoscopic LED display. The fundamental theorem of stereoscopic imaging is to create two different views for both eyes. In this study, an integration of LED and lenticular lens array is to achieve spectral effects. By LightTools design software analysis, the best lenticular lens curvature and LED placement is then obtained; achieving the best effect of the autostereoscopic display. Small scale matrix array module is used to verify the feasibility in developing large scale autostereoscopic LED display. The implements from small scale matrix array module to large scale autostereoscopic LED display will be more mature in near future.
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Liang, Cheng-Chang, and 梁成章. "The Legibility of Arabic Numerals Applying to LED Display." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/78237605753998108577.
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碩士國立臺灣科技大學
設計研究所
92
LED Display generally applies to public space and traffic system. Its major function is how to provide the necessary information to the observer. Numeric is the common word system in the world, and number ( for example: temperature, speed, time, stock quotes, and mileage) is also the main content of LED Display. It involves in the accurate information, so it is important that how to let observer quickly and accurately recognize these numbers form a mass of information. This study will concentrate on the vision recognizable evaluation of Arabic numerals applying to LED Display. I will have an experiment on the effect of “the Stroke characteristics of the Numeric character” and “the Resolution of LED Display” to the results of the vision recognizable evaluation. Inferring a conclusion from the facts: 1. LED Display arranged by matrix is made by LED dots. The facts to decide how to show it include the resolution of LED Display, the size of LED dots, the dot pitch of LED Display and the color of LED. The size of the dots, the dot pitch and the light color can be adjusted by practical needs, and the resolution of LED Display is the most important part of legibility. 2. The factor affects the numeric legibility including: the characteristic of stroke, the stroke width, character height and character width-to-height ratio. The numeric strokes of vertical, horizontal, curve, and crisscross always misunderstood by their identical with characteristic. When the numeric applying to LED Display, the legibility really affected by “the characteristics of the Numeric character” and the lights of vertical of LED Display. 3. The study of related documents and records always uses “serif” and “sans serif” as the classifying script basis, but it differs from the meaning of the detail strokes characteristic, including different recognition and explanation of “serif”. For the convenience of later study of consistency, I give the definition of “the characteristic of the end detail strokes” as “the end of stroke”. 4. When numeric of “the same thickness of the horizontal and vertical line” applies to LED Display, the lights of LED Display are less, and it can’t display the familiar numeric stroke characteristic. The lowest legibility is 7 vertical points, and it is also the lowest threshold. The standard of ordinary people is 11 vertical points. No matter there is the end of stroke characteristic, the legibility of a word in standardized form is much better than a word in italic type. When the changing of the characteristic of the end of stroke applies in italic type, it is disadvantageous to legibility.
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Lin, Wei-Kai, and 林惟凱. "3D High-Brightness Autostereoscopic Display Systems with LED Backlight." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/07537552131445777001.
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碩士國立彰化師範大學
機電工程學系
100
The purpose of this thesis is to discuss the technical problems of LCD, especially 3D. The research direction focuses on 3D display effects and improved visual effects. This thesis mainly uses Glass Parallax Barrier to go with 3D digital photo frame made by LCM (LCD Module). The brightness of LCM will decrease 50%, due to the Parallax Barrier method. Therefore, this thesis will have the further discussion on backlight improvement. Besides the improvement of 3D display brightness issue, this thesis also mentions the applications of LED backlight and DBEF to diminish consumed power and enhance the backlight brightness.
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Hsieh, Mingyu, and 謝明諭. "Mini/Micro LED Display Module with RGB Full Colorization." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/g874bd.
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碩士逢甲大學
自動控制工程學系
107
Mini/Micro-LED display is considered as the most promising one among the products of display technology for next generation. The major advantages are high efficiency, high brightness, high reliability, fast response, and low power consumption. However, it suffers from several limitations, such as mass transfer technology, full colorization, and driver IC. In view of this, this research proposes a Mini/Micro-LED display module with RGB full colorization. The core concept is to produce a white light through integrating the blue LED array and the yellow phosphor film. Furthermore, the color filter was combined to achieve a self-emitting full-color display with RGB dot array. The display module was mainly divided into three parts, including the LED array, electroformed nickel with holes’ structure, and color filter. First of all, the 32×32 LED arrays with the pixel size 200×200 μm2, 100×100 μm2, and 80×80 μm2 are fabricated, simultaneously. After that, the holes and filter fabrication are finished by nickel electroforming and photolithography process. Finally, the three parts of entire display module was integrated by vertical stacking. Based on the above methods, the experimental results show that R, G, and B three color lights are produced, effectively, and the corresponding peak wavelength are 590 nm, 540 nm, 465 nm, respectively. However, the module is limited by the sapphire thickness and the Lambertian light distribution result in the brightness and contrast decreased. In the future, the problems mentioned above can be solved by optimizing the structure design.
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Chiou, Yu-Ruei, and 邱于瑞. "Fabrication of a Flexible LED Display by 3D Micro Assembly." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/87132528129234977393.
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碩士國立彰化師範大學
顯示技術研究所
97
In this work, we proposed a novel architecture with meshed circuit and using micro-self-assembly technology to fabricate a flexible, bright and wide viewing angle LED display. The meshed circuit is appropriate to flexible electronics due to its flexibility and heat dissipation capability. Compare to LCD, using LED chips as a display device has many unique advantages including faster response, better brightness and wider viewing angle. Furthermore, the flexible LED architecture is more durable to substrate bending than LCD. This research focuses on the technologies of LED chip, mesh circuit, conductive bead micro-assemblies and the process integration. These processes, including gold wire ordering, solder ball self-assembling and translating, LED chip translating, and vertical hot press processing. In this experiment, we have successfully fabricated a 3×3 flexible LED display component.
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Li, Yi-Lin, and 李宜霖. "The Design of LED Display using Flat Surface Rotating Mechanism." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/50277876247360806846.
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碩士國立交通大學
電機與控制工程系
89
Due to the cost of the high illuminating LED for a large scale full color LED display, In the present thesis, we propose a design that can be used to reduce the total number of LEDs in the display. In this design, the time-spatial sharing mechanism is developed to share the illumination using moving LED bars. By driving the LED bars according to the time-space and coordinate on the LED display synchronously, we not only can get realistic illuminance, but also save the number of LEDs used in the system considerably. The purpose of this thesis is to analyze the feasibility of utilizing the human vision in halting image. Here, the time-spatial sharing mechanism or the flat surface rotating mechanism is developed for one dimensional scanning effect that is used to produce a complete image .The mechanism consists of two parts: a conveyer with LED bar attached on the belt and a driving motor that produce the scanning effect on the LED bars. In this thesis, we have completed the motor servo control for stabilizing the scanning speed and the generation of synchronization signal so that image signal can be transmitted accordingly.
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Chou, Yan-zhi, and 周彥幟. "Color Correction for the Surrounding Full-Color LED Display System." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/67628510500420158995.
Full textAbstract:
碩士國立聯合大學
電機工程學系碩士班
97
With rapidly advancing computer technology, the demand of color images is growing with time for both quantity and quality, especially for various display panels. The purpose of this thesis is to research and develop a method of color correction for a 360-degree surrounding LED display system such that all brilliant images can be seen from any view of angle. The color correction techniques include: 1. PWM (Pulse Width Modulation) control of a linear relationship between RGB input value and output luminance; 2.Gamma correction for gradation of the luminance; 3. Based on LED white point, make a compensation for the RGB input values; 4. Find a right weighted filter to eliminate the luminance effects among LEDs. The great enhancement of color saturation and brightness is achieved by the color correction methods described above. The display quality of the surrounding LED display system is improved and close to the display of the current commercial LCD and CRT.
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Gong, Fan-Shuo, and 龔凡碩. "Inspection and Correcting of the Relative Luminance on LED Display." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/55947707211077634777.
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碩士國立中正大學
電機工程所
96
With the rapidly improvement of LED (Light Emitting Diode) from 1955 to present, it has been applied widely in many aspects. Because of the successful development of high brightness LED particularly, the advantages such as high brightness, wide view angle, and easy composition have been noticed and bring the great mass fervor on LED display board and become main stream in display board. The luminance of LED will decay gradually with the using time and the level of decay of every LED is different, so the LED display board after resulting in using for a long time will present the question uneven in luminance. As the result, the luminance of LED display board should be maintained regularly with measuring and maintenance frequently. A set of simple methods to reach this purpose in this study: Using the CCD digital camera to take an image of LED display board and distinguishing and dividing the lighting areas of every LED, and analysing the relative luminance on display board on making use of basic technique in image processing. Finally, compare with the relative luminance table, the compensation and correction of the luminance on LED display board can be evaluated and improve uniformity of LED display board. After the experiment, the mean absolute error of LED display board can mostly reduce to less than 1%. It shows that the method we offered to measure and adjust the relative luminance on LED display board is reliable.
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Chien, Kuo-Hsiang, and 簡國祥. "Study display Panel LED backlight combination power consumption and efficiency." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/84067964218825503223.
Full textAbstract:
碩士國立交通大學
平面顯示技術碩士學位學程
102
LCD production technology in recent years, becoming more skillful and began to spread, along with its related components also flourished. In many of the key components in the LCD on, he entered the threshold of the minimum backlight module, but its share of the cost is very high proportion, thus attracting a large number of manufacturers into the manufacturing ranks. And its associated optical simulation study is one of many more, but these are generally explore its light uniformity, which is part of the light guide plate and the diffusion film, as backlight LED strings and numbers, that is, efficiency and power consumption Most of the research is rare. Therefore, this paper will focus on the backlight module efficiency and power consumption on the part of the analysis., In this study, the use of LCD module backlight and backlight driving its underlying structural parameters: LED serial to parallel the number of backlight driving frequency, different backlight brightness for analysis and discussion, to observe its effect on the number of LED strings and the efficiency and power consumption.
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CAI, JYUN-NAN, and 蔡俊男. "High resolution display system of dynamic cylindrical full color LED." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/28305804966341104998.
Full textAbstract:
碩士建國科技大學
電子工程系暨研究所
104
This thesis is mainly for rotating display with a small amount of LED to research and development of higher resolution display, and a motor mounted single row of RGB LED lamps with single-chip microcontroller through high-speed rotation mode, by using the principle of human persistence of vision to achieve the same scan TV wall display and has a wider than 360 TV wall ring display. Its main feature of this work is to use a small amount of control core PIC32MX795F512H and 160 primary colors SMD precision RGB LED with dynamic scan control technology, it can display up to 16,777,216 colors. In addition, to increase the density of pixels and resolution of the point this work also uses Bluetooth and XBee wireless communication module, through App developed via phone and computer HMI terminal and incorporate wireless communications technology to replace reached the distal end of the remote screen and surround display. So people in anywhere can watch the dynamic display and dramatically improves the efficiency of the message spread to complete high-resolution full-color LED display screen cylinder dynamic system of control applications. Through the results testing, regardless of the high quality graphics and photos display a good display on the screen is obtained.
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Huang, Ya-Chi, and 黃雅琪. "A Study on the Text Legibility of Large LED Display." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/72394607639087306925.
Full textAbstract:
碩士大同大學
工業設計學系(所)
104
The study aims to explore into the visibility of text information on large LED display as the effective segment information, quick search and correct reading performance. The experiment sample design is conducted on three variables, namely color combination of figure/background, tracking and leading. The experiment is conducted in three stages, including “Accuracy Recognition Measure,” “Distance Subjective Evaluation and Glare Level Questionnaire” and “Glare Distance Measure.” The data analysis adopts descriptive statistics analysis and multi-factor analysis of variance. The results suggest that color combination of figure/background, tracking and leading all have impact on glare distance but do not affect each other. The furthest glare distance is red/green, which is the combination that is more likely to perceive glare, followed by red/red. The closest distance is yellow/blue, which is the combination that is less likely to perceive glare. Findings of objective recognition and subjective evaluation indicate that the color combination with high recognition accuracy is not necessarily identical to visual subjective perception. In sum of the results between subjective and objective comparison, the best combination of visibility for color combination of figure/background is yellow/blue, amber/amber, and yellow/yellow. With regards to tracking, the standard glare distance of tracking is greater than tracking fine-tuned to 100 and is likely to perceive glare. With regards to leading, leading 150% is better than leading 120%. Tracking and leading show significant difference at 28 meter, the visibility of leading 150% is better than that of leading 120% and tracking fine-tuned to 100 is better than the tracking standard. Nonetheless, tracking at 44 meters does not show significance. The study concludes the design principles that meet the public visual perception, which results can be referred for the information on LED display design in extensive applications such as the train station, shops, airport, or roads.
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Hsieh, Sheng-Hsun, and 謝昇勳. "High Efficiency LED Illuminator for 2D/3D Switchable Projection Display." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/39669416502236085383.
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碩士國立清華大學
動力機械工程學系
99
A LCoS projection display architecture based on LED illuminator is proposed with simulation analysis and prototype evaluation for both improving the utilization efficiency of light source and adding new capability of high dynamic range in 2D presentation with switchability to 3D function. The light source is divided into two yet identical light paths with orthogonal polarization to illuminate two LCoS panels. The image on both panels are combined and spatially aligned in the projection light path so as to share a single projection lens module. Each of the two illumination light paths has its own intensity control unit so that the brightness of two panel images can be well balanced, especially for the 3D presentation mode. Evaluation on the prototype shows that the each projection pattern can keep the uniformity performance on the screen while the intensity control unit is tuned from fully closed to fully opened. Light utilization efficiency up to 9%.
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朱書慧. "Application of Micro Optics for Naked-eye 3D LED Display." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/94277055359977127409.
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Hsiao, Yun-Yue, and 蕭雲嶽. "A Kind of Wireless Intelligent LED Dimmer with Illumination Display." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/9e4fj2.
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碩士國立虎尾科技大學
光電與材料科技研究所
99
The thesis provides a kind of Intelligent wireless Light Emitting Diode dimmer technique, People use the system that can gain more comfortable and save the electricity. Base on the technique was developed a kind of wireless LED dimmer with illumination display. Traditional fluorescent lamps is so consumes the electricity. When people want to save the electricity that are usually reduce the lamps number so that make their vision feel uncomfortable. Compared with LED fluorescent lamp, LED fluorescent lamp has better brightness and low power loss. Therefore, LED will instead of traditional fluorescent lamps. The thesis is a kind of small module which has high flexibility. Compare with large LED dimmer module the small one is suit to work in generally family than the other one. We use 8 bit microcontroller to develop a kind of wireless LED dimmer with illumination display . It’s not only has Lux value display on LCD monitor but also it can let detector signal feed back to microcontroller to process. The system use algorithm that can adjust PWM dutyfactor to make LED automatic Changes bright or dark. The system combine PIR detector. If nobody pass there ,the LED will be auto closed.
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Han, Ming-yuan, and 韓明媛. "The study of porjection display using RGB LED as light source." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/81835246207915129688.
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碩士國立中央大學
光電科學研究所
96
In this thesis, we study to optimize the optical system with RGB LEDs. We start from the design of the compound parabolic concentrator to collect the light from LEDs and maintain the etendue requested by the optical system. At the same time, we simulate the optical distribution with specific LED arrangement. We compare the experimental measurement with the simulation and finally design an optical module for the LED projection system, where the system efficiency as well as uniformity are analyzed.
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Wang, Tai-Lai, and 王泰來. "Development of High-light LED Display System with Embedded Micro-controller." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/37836713972593543065.
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碩士國立中正大學
電機工程所
93
This thesis proposes an embedded micro-controller design on FPGA and develops a high-power high-light LED display system according to the platform. The IP reused technique in SoC design is more and more important, duo to low-cost and low-time-to-market. The SoC-MCU platform design is the key component for more consume electronics or industry applications. A MCU base SoC platform with more powerful peripherals like A/D, D/A, memory, PSTN remote control, or etc., is popular in unmanned working environment or remote districts. We will develop the SoC-MCU platform, especially in memory access and UART communication in this thesis. The system includes Image Capture Module, Time-division Multiplexing DMX Encoder Module, Multi-loop DMX Decoder with LED Characteristic Curve Correct Module, and High-power High-light LED Display Module. The image capture module is embedded in on our SoC-MCU platform for PC communication and image data transform. The DMX encoders/decoders are integrated in the LED module for image capture data and transformation LED controller data/signal to drive LED. The system with true color display capability is full implemented in FPGA. In the future, some of modules will be implemented in VLSI technology
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CHEN, CHIEN YANG, and 陳建揚. "The Design and Manufacture of Scanning Mechanisms for Large LED Display." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/50166742156688049555.
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碩士國立交通大學
電機與控制工程系
88
For a half-outdoor full color LED display, because it is very expinsive for the high illumination LED, we hope to reduce the LED quantity for reducing the cost for manufacturing. The method is using the theorem of people’s halting vision and that making one dimension scanning by mechanism is to make fewer LED of column to perform a complete image. Thus it can be seen, the key point is that if the scanning mechanism of half electric and half mechanism can been provided a reciprocation of a cycle stably, and when it is moving so quickly, the power and signal can been transport to LED module successfully. Thus, the purpose of this paper is to design a practicable scanning mechanism and transport the power and signal successfully for reducing manufacturing cost. We use the method : 1.Rotating with flat surface : driving conveyer and pulley by motor is to make them scanning with rotating. 2.Scanning with reciprocation : including vibrating with reciprocate and reciprocate with crank-slider, we use the to reciprocate.
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CHEN, WEI-YU, and 陳威宇. "Implementation and Control of a Wheel Type Full-Color LED Display." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/02354236499464274096.
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碩士建國科技大學
電子工程系暨研究所
104
In this thesis is based on the single chip micro-computer control of single RGB LED lanterns set, which is fitted in the bicycle rim of the wheel and used the DC motor-driven simulation frame of bicycle wheels tire rotation, so as to reach spin-wheel monitor display. This work is characterized by a small number (32 pieces) RGB LED, using persistence of vision effects out of disc-shaped full-color display, apart from increasing the wheel outside the arc of the Visual effects, but also a rider in the night security, and can be used as a promotional or advertising identification of cycling teams. This monitor system based on Microchip PIC32MX470F512H single chip micro-controller as a main control center and armed with four 12-bits PWM LED driver IC-TLC5951 to control RGB LED full color display for changes, and a magnetic sensor to fix image display position control. And this works using Bluetooth module matches the cell phone, remote switch image display feature, can also pass data by computer RS232 communication interface, through wireless transmission module of packet transmission and achieve the real-time image functions.