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Dissertations / Theses on the topic 'LED modul'
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1
Prokš, Jiří. "Zákaznicky upravitelný modul zadní skupinové svítilny s HD rozlišením." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318409.
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This thesis deals with the design of LED matrix array contains 150 LEDs. In the first part, the thesis identifies source of light like OLED and LED and provide an overview of their lifetime, reliability and basic principle of design systems with LEDs. The thesis then describe design of LED matrix array, deals with power supply of this LED array and with cooling of LED. Finally the thesis describes a software for contol of LED matrix array.
2
Byrtus, David. "Osvětlovací LED modul pro bezkontaktní měření fyziologických parametrů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242099.
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This thesis describes the design of the illumination LED module for contactless measurement of basic physiological parameters. Contactless methods is based on the fotopletysmografických methods. The acquisition parameters used video camera for monitoring body part of the patient. Designed lighting LED module is used to enhance the optical signal with respect to quantum efficiency of the camera used. The acquired video sequences are then programmatically processed, analyzed, and the result is an estimate of the measured parameter.
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Janík, Daniel. "Provozní parametry LED světelných zdrojů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316394.
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The aim of the thesis is to introduce the basic photometric quantities and operating parameters of LED light sources, according to which the light sources are evaluated and compared. The thesis examines effects of high temperature and elevated stress on LED retrofits and a design of measurement methods to measure these influences. According to the proposed methods, nine samples of light sources were measured and compared to each other on a basis of the measurements. Comparison was made from the point of view of the energy as well as the quality of the produced light. The results were also compared to the parameters specified by the producers.
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Bordovský, Lukáš. "Hodnocení LED náhrad světelných zdrojů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220292.
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The aim of my thesis is to become familiar with LED replacements of light sources, possible problems, advantages and disadvantages. In the work are at first explained terms of light technology. Then are concisely described actual light sources, that can be replaced by LED. That concern: classic bulbs, halogen bulbs, linear fluorescents and compact bulbs. After that is described principle of LED light fittings and advantages, disadvantages nowadays to use LED light fittings. The main emphasis is placed on chapter 5. The compensations of linear fluorescents by LED moduls. The following chapters are dedicated to comparison of fluorescent lamps and LED moduls. Involving-photometrics parameters, luminous intensity, lumniance analysis and also economics comparison of lighting systems with fluorescent lamps versus the LED moduls.
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Martinka, Václav. "Bezdrátové ovládání LED světel." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2021. http://www.nusl.cz/ntk/nusl-445572.
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This work deals with the design and implementation of Wi-Fi LED lighting. It consists of various modules - switches, buttons, single or multicolored light sources - and a central unit that provides mutual communication and automation. The result of the work is the design of a prototype and several modules, which are built on the basis of the microcontroller ESP32. Their utility is implemented in C++. The user interacts through the website. The main result of this thesis is a demonstration of the possibility of using Wi-Fi to control light sources and creating complex lighting using a combination of simple modules and rules.
6
Sikora, Roman. "DC-DC měnič pro matrix beam modul." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413161.
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The master thesis deals with the development of buck-boost DC-DC converter which supplies matrix beam module. The design is focused on testing two-phase boost converter and three channel buck converter manufactured by NXP Semiconductors. Part of the design is implementation of microcontroller for converter control and communication with computer. Part of the thesis is also to design user interface on Windows platform for easy system configuration. Next thing the thesis deals with is designing load for DC-DC converter that is variable and can make different current consumption. One part of this thesis is focused to achieve the lowest conducted emissions and to maximize conducted immunity. Part of this project is production of a prototype and prototype testing.
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Kropáč, Vlastimil. "Vláknový osvětlovací modul pro mikroskopii." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417106.
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This diploma thesis describes the design of the illumination system for a Coherence--Controlled Holographic Microscope (CCHM). The theoretical part mentions the history of microscopy, the principle of holography and individual types of interference microscopy. To get closer to the topic, individual light sources and an overview of current illumination systems are mentioned. The diploma thesis also describes the procedure of designing a fiber-optic illumination module for microscopy from optical design through design of construction to the last step, which is assembly and testing of the module.
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Tomeš, Martin. "Simulace LED náhrad v reálných podmínkách." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220695.
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This Master’s Thesis on Simulation of LED retrofits under operational conditions is divided into theoretical and practical part. Theoretical part in the introductory section deals with the concepts of lighting technology and presents some electric light sources, such as classic bulbs, halogen bulbs, linear and compact fluorescent lamps. It also describes the principle of electroluminescent light sources (LED), which discusses principles of yielding a white light, the main advantages of LED etc. The reader is familiar with the issue of compensation the linear fluorescent lamps tubular LED source and with the work environment programme ReluxPro that is used for design of the lighting system. Practical part of the thesis is divided into two chapters. In the first chapter, measured linear fluorescent lamps and LED modules for the light-technical parameters, luminous intensity, radiation spectrum and settling time of light sources are evaluated and compared. The second chapter is solved by using ReluxPro, which explores the impact on the lighting and the brightness of the room layout SA 5.10 while using various light sources. In conclusion, there is an economic aspect of linear fluorescent lamps and LED modules analyzed. Results from the program ReluxPro are continuously compared with real measured values.
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Nejedlý, Tomáš. "Bezdrátové zabezpečovací zařízení." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218410.
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This project deals with design and study wireless security device. This device works in ISM band, created by two modules handling secure subject. Microprocessor AVR from company Atmel provides communication between these modules.
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Nemček, Oliver. "Rozšiřující modul s dotykovým LCD displejem pro výukovou platformu Minerva." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2017. http://www.nusl.cz/ntk/nusl-363882.
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The aim of this Master thesis is create an expansion module with TFT touch screen display for educational Mierva platform. Low level driver and graphical user interface library will be developed for this module. GUI library enables user to design an graphical application in easy way.
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Jankovský, Martin. "Řízení svítidla LED." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442588.
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The main topics of the thesis are luminaries based on LED technology and methods for driving them. The aim of theoretical part is to offer basic knowledge about LEDs, their categories, advantages and disadvantages. The basic methods for driving LED modules are also presented. Based on these facts the design of LED switching power supply for street lighting is presented. The aim is to reach high power factor. The function of the devices is presented by examining parts of the power supply.
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Hofman, Miroslav. "Řídící modul dvouosého kartézského manipulátoru pro PLC S7-1200." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241993.
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This thesis deals with the design of module for control of biaxial cartesian manipulator. Control module recieves signals STEP and DIR from PLC - these signals can have frequency up to 100 kHz. They are processed by the module and send to inputs of drivers, which control motors of biaxial manipulator. Both axis of manipulator are driven simultaneously. PLC is not able to manage this process without this module. Adjusted parameters are displayed on LCD display. Control module is disturbance-resistant. All signals are isolated by fast optocouplers, which guarantee minimum distortion of signals. Data are processed by microprocessor ATXMEGA. Program of microprocessor is written in the C language. It is possible to switch module to NPN or PNP logic and it is also possible to select output voltage 5 or 24 V according to the type and adjustment of used driver for motor control.
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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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Macuacua, Eduardo F. "Export expansion as determinant of economic growth in Mozambique: a co-integration analysis." Thesis, University of the Western Cape, 2008. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_2412_1269987891.
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The objective of this study is to empirically examine the export-led growth hypothesis in Mozambique using quarterly time series data over the period of 1987-2004, applying a co-integration analysis, Engle and Granger&rsquo
s (1987) Error Correction Model (ECM) and the Granger causality test. The paper explores the causal relationship between economic growth and othe explanatory variables, such as real exports, imports, labour force, gross capital formation, terms of trade, civil war and natural disasters (the last two as dummy variables).
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Remella, Siva Rama Karthik. "Steady State Mathematical Modeling of Non-Conventional Loop Heat Pipes: A Parametric and a Design Approach." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1353154991.
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Manona, Siyabulela S. "Smallholder agriculture as local economic development (LED) strategy in rural South Africa: exploring prospects in Pondoland, Eastern Cape." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&.
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The aim of this study was to explore the role and the prospects of smallholder agriculture as local economic development in Eastern Pondoland, in the former Transkei homeland. The study explored the role of agriculture in contributing to local economic development and the upliftment of the rural poor. It also explored the role that government and its agencies have played and could play in stimulating agricultural development.
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Tuladhar, Looja R. "Resonant Power MOSFET Driver for LED Lighting." Youngstown State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1264709029.
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Freixieiro, Gomes de Mello Rafael. "Design-led future forecasting model for mobile communications." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/13142.
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Since the establishment of the wireless sector, design has been playing a wide range of roles. Specialized literature has been extensively reporting the use of this discipline associated with NPD, focusing on hardware and software development in the mobile communications. On the other hand, evidences of its use to support forecasting are scarce and generic. Finally, formal publications addressing future forecasting from a design perspective in the context of mobile communications have never been reported, leading to a knowledge gap that needs to be addressed. This research investigates the strategic roles, applications and contributions of design and designers for future forecasting in the wireless telecom sector. As a comprehensive discipline, it is used to examine and identify a number of factors that might influence/impact in the development of visionary solutions supporting the design team of traditional handset manufacturers to make better decisions in order to ‘shape’ the future in the wireless industry. Considering these ideas, the aim of this research is to create a ‘design-led future forecasting model for mobile communications’ to assist and support traditional manufacturers’ design team. This PhD study relies on a qualitative methodology comprising a number of data collection and analysis tools (e.g. literature review, case studies analysis, in-depth experts’ interviews, workshops and Grounded Theory). To create the intended framework, extensive secondary and primary data; theoretical and practical inputs were brought together, analysed and combined. The proposed model was evaluated through two rounds of experts’ interviews complemented by two workshops with potential users (e.g. design students) to check and explore its practicalities when applied to design for the future. Finally, this study bridges future forecasting and the wireless telecom through the use of design to address the literature gap. The richness of the developed model provides practical assistance to traditional manufacturer’s design team informing about a broad spectrum of aspects that should be considered when designing for the future in the mobile telecom industry, supporting strategic decision making in different stages of the future-led design process.
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Musil, Tomáš. "Bezdrátový pager." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217967.
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The aim of thesis is a design of wireless pager, that can be used for short text messages transmission from the sender to a particular recipient. The report is sent from a computer via serial port. The application is based on microcontrollers, which provide data protection, evaluation and display data on the display of the receiver. The wireless transmission is effected via the RF modules, that are powered from batteries.
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Gül, Zakir. "A Partial Test of the Intelligence-Led Policing Model." Kent State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=kent1258580104.
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Ngxiza, Sonwabile. "Governance, management and Implementation challenges of Local Economic Development (LED) in Khayelitsha." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_1659_1307441323.
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Development should not be viewed as just a project but must be understood as an overarching strategy with a thorough implementation plan and specific targets as well as review mechanisms. All different spheres of government, organs of civil society and business have a tremendous role to play in pursuit of sustainable economic growth and development. In Khayelitsha there are emerging trends of bulk infrastructure spending and community led partnership that seek to unlock the economic potential however this progress has thus far been limited to retail development with no productive industrial development.
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Burel, Guillaume. "Bonnes démonstrations en déduction modulo." Phd thesis, Université Henri Poincaré - Nancy I, 2009. http://tel.archives-ouvertes.fr/tel-00372596.
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Cette thèse étudie comment l'intégration du calcul dans les démonstrations peut les simplifier. Nous nous intéressons pour cela à la déduction modulo et à la surdéduction, deux formalismes proches dans lesquels le calcul est incorporé dans les démonstrations via un système de réécriture. Pour améliorer la recherche mécanisée de démonstration, nous considérons trois critères de simplicité.L'admissibilité des coupures permet de restreindre l'espace de recherche des démonstrations, mais elle n'est pas toujours assurée en déduction modulo. Nous définissons une procédure qui complète le système de réécriture pour, au final, admettre les coupures. Au passage, nous montrons comment transformer toute théorie pour l'intégrer à la partie calculatoire des démonstrations.
Nous montrons ensuite comment la déduction modulo permet de réduire arbitrairement la taille des démonstrations, en transférant des étapes de déduction dans le calcul. En particulier, nous appliquons ceci à l'arithmétique d'ordre supérieur pour démontrer que les réductions de taille qui sont possibles en augmentant l'ordre dans lequel on se place disparaissent si on travaille en déduction modulo.
Suite à ce dernier résultat, nous avons recherchés quels sont les systèmes d'ordre supérieur pouvant être simulés au premier ordre, en déduction modulo. Nous nous sommes intéressés aux systèmes de type purs et nous montrons comment ils peuvent être encodés en surdéduction, ce qui offre de nouvelles perspectives concernant leur normalisation et la recherche de démonstration dans ceux-ci. Nous développons également une méthodologie qui permet d'utiliser la surdéduction pour spécifier des systèmes de déduction.
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Dornic, Nausicaa. "Élaboration et comparaison de deux modèles de durée de vie des fils d’interconnexion des modules de puissance, l’un basé sur les déformations et l’autre sur les dégradations." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN043/document.
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Dans de nombreux domaines, tels que l’industrie des transports ou bien des infrastructures, la tendance est à l’introduction toujours plus importante d’équipements électriques. De ce fait, les industriels sont de plus en plus confrontés à la nécessité de fournir des dispositifs robustes et fiables avec un minimum de maintenance. Les composants électroniques, tels que les transistors IGBTs ou MOSFETs et les diodes rassemblés dans des modules de puissance, sont au cœur de la conversion d'énergie électrique. En conséquence, ils sont soumis en opération à de fortes contraintes environnementales et fonctionnelles (température, humidité…). L’ensemble de ces contraintes a un impact sur la durée de vie des composants, et donc sur la fiabilité des dispositifs. D’un point de vue économique, le remplacement d’un équipement défectueux est moins pénalisant qu’une défaillance brutale du système. Ainsi, l’utilisation d’outils de diagnostic est nécessaire pour prédire la durée de vie restante des dispositifs en opération, et mettre en place une maintenance adaptée et efficace.Pour déterminer la durée de vie restante des modules de puissance en opération, des modèles de durée de vie sont utilisés. La plupart de ces modèles sont établis soit de manière empirique, soit de manière physique, soit de manière statistique. Les modèles empiriques sont les plus courants, car leur réalisation et implémentation sont maintenant bien connues. Ils se basent sur des résultats issus de tests de cyclage accélérés qui reproduisent les contraintes endurées par le module de puissance sous des conditions "accélérées" de fonctionnement. Une extrapolation est ensuite nécessaire pour obtenir l’état de santé du dispositif dans des conditions normales de fonctionnement. Le principal inconvénient de ces modèles réside dans le manque de description des mécanismes physiques responsables de l’endommagement. Ce manque peut mener potentiellement à des erreurs, notamment lors de l’extrapolation. C’est pourquoi les modèles basés sur la physique connaissent un intérêt grandissant.Dans cette thèse, deux modèles de durée de vie basés sur la physique et appliqués aux modules de puissance IGBTs sont proposés et comparés. La première approche est basée sur les déformations induites à l’intérieur de l’assemblage du module lorsque soumis à des contraintes thermiques. Dans ce cas, la dégradation est décrite via la quantification des déformations pour un stress thermique donné. Dans la seconde approche, le modèle de durée de vie est basé directement sur l’endommagement via l’établissement d’un modèle de dégradation. La comparaison des deux modèles met en lumière les défauts et qualités de chacun. D’une manière plus générale, l’établissement et la comparaison de ces modèles s’inscrit dans une démarche de développement d’outils de diagnostic afin de prédire la durée de vie restante des modules de puissance en opérationThe domain of power electronics reliability has become an important center of interest with the recent massive system electrification. The manufacturers are more and more confronted to the necessity of producing reliable devices with optimized maintenance. Electronics components, such as IGBTs, diodes and MOSFETs assembled in power modules, are at the center of the systems conversion, and as a consequence, are subjected to high environmental and functional stresses (ambient temperature, vibrations…). All these factors have a strong impact on the components lifetime and thus on the devices reliability. Economically, scheduling a maintenance with a system replacement is less detrimental than a brutal failure of the system. As a consequence, the use of lifetime prognostic tools is necessary. The problematic consists in the health state prediction of power modules in functioning to be able to schedule a maintenance before the failure of the equipment.To be able to determine the remaining useful lifetime of power modules in functioning, lifetime models are used. These models can either be empirical, physical or statistical. The empirical models are the most common ones, because of their easy establishment and implementation. They are based on results from accelerated power cycling tests, which reproduce the stresses endured by the power modules in severe conditions. An extrapolation is then needed to obtain the power module health state in normal functioning conditions. The main drawback of these models is the lack of description of the physical mechanisms leading to damage, resulting potentially in errors in particular during extrapolation. That’s the reason why physical models start to draw more attention.In the thesis, two physical lifetime models of IGBT power modules are proposed. The first approach is based on deformation induced inside the device assembly in operation. The degradation is in this case described by the quantification of deformation related to thermal stresses. In the second approach, the lifetime model is based directly on damage through the establishment of a degradation model. These two lifetime models are finally compared to show the benefits and disadvantages of each. More generally, the establishment and comparison of these models is part of an approach to develop diagnostic tools so that the remaining useful lifetime of power modules can be predicted in operation
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Gonzalez, Perez Carlos Alberto. "Pragmatic model verification." Thesis, Nantes, Ecole des Mines, 2014. http://www.theses.fr/2014EMNA0189/document.
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L’Ingénierie Dirigée par les Modèles (IDM) est une approche populaire pour le développement logiciel qui favorise l’utilisation de modèles au sein des processus de développement. Dans un processus de développement logiciel base sur l’IDM, le logiciel est développé en créant des modèles qui sont transformés successivement en d’autres modèles et éventuellement en code source. Quand l’IDM est utilisée pour le développement de logiciels complexes, la complexité des modèles et des transformations de modèles augmente, risquant d’affecter la fiabilité du processus de développement logiciel ainsi que le logiciel en résultant.Traditionnellement, la fiabilité des logiciels est assurée au moyen d’approches pour la vérification de logiciels, basées sur l’utilisation de techniques pour l’analyse formelle de systèmes et d’approches pour le test de logiciels. Pour assurer la fiabilité du processus IDM de développement logiciel, ces techniques ont en quelque sorte été adaptées pour essayer de s’assurer la correction des modèles et des transformations de modèles associées. L’objectif de cette thèse est de fournir de nouveaux mécanismes améliorant les approches existantes pour la vérification de modèles statiques, et d’analyser comment ces approches peuvent s’avérer utiles lors du test des transformations de modèlesModel-Driven Engineering (MDE) is a popular approach to the development of software which promotes the use of models as first-Class citizens in the software development process. In a MDE-Based software development process, software is developed by creating models to be successively transformed into another models and eventually into the software source code. When MDE is applied to the development of complex software systems, the complexity of models and model transformations increase, thus risking both, the reliability of the software development process and the soundness of the resulting software. Traditionally, ensuring software correctness and absence of errors has been addressed by means of software verification approaches, based on the utilization of formal analysis techniques, and software testing approaches. In order to ensure the reliability of MDE-Based software development processes, these techniques have some how been adapted to try to ensure correctness of models and model transformations. The objective of this thesis is to provide new mechanisms to improve the landscape of approaches devoted to the verification of static models, and analyze how these static model verification approaches can be of assistance at the time of testing model transformations
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Sen, Sagar. "Automatic effective model discovery." Rennes 1, 2010. http://www.theses.fr/2010REN1S042.
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Les découvertes scientifiques aboutissent souvent à la représentation de structures dans l’environnement sous forme de graphes d’objets. Par exemple, certains réseaux de réactions biologiques visent à représenter les processus vitaux tels que la consommation de gras ou l’activation/désactivation des gênes. L’extraction de connaissances à partir d'expérimentations, l'analyse des données et l’inférence conduisent à la découverte de structures effectives dans la nature. Ce processus de découverte scientifiques peut-il être automatisé au moyen de diverses sources de connaissances? Dans cette thèse, nous abordons la même question dans le contexte contemporain de l'ingénierie dirigée par les modèles (IDM) de systèmes logiciels complexes. L’IDM vise à accélérer la création de logiciels complexes en utilisant de artefacts de base appelés modèles. Tout comme le processus de découverte de structures effectives en science un modeleur crée dans un domaine de modélisation des modèles effectifs, qui représente des artefacts logiciels utiles. Dans cette thèse, nous considérons deux domaines de modélisation: métamodèles pour la modélisation des langages et des feature diagrams pour les lignes de produits (LPL) logiciels. Pouvons-nous automatiser la découverte de modèles effectifs dans un domaine de modélisation? Le principal défi dans la découverte est la génération automatique de modèles. Les modèles sont des graphes d’objets interconnectés avec des contraintes sur leur structure et les données qu'ils contiennent. Ces contraintes sont imposées par un domaine de modélisation et des sources hétérogènes de connaissances, incluant plusieurs règles de bonne formation. Comment pouvons-nous générer automatiquement des modèles qui satisfont ces contraintes? Dans cette thèse, nous présentons un framework dirigé par les modèles pour répondre à cette question. Le framework pour la découverte automatique de modèles utilise des sources hétérogènes de connaissances pour construire, dans un premier temps, un sous-ensemble concis et pertinent d’une spécification du domaine de modélisation appelée domaine de modélisation effectif. Ensuite, il transforme le domaine de modélisation effectif défini dans différents langages vers un problème de satisfaction de contraintes dans le langage de spécification formel Alloy. Enfin, le framework invoque un solveur sur le modèle Alloy pour générer un ou plusieurs modèles effectifs. Nous incorporons le framework dans deux outils: Cartier pour la découverte de modèles a partir de n’importe quel langage de modélisation et Avishkar pour la découverte de produits dans une LPL. Nous validons notre framework par des expérimentations rigoureuses pour la génération de test, la complétion de modèles partiel, la génération de produits, et la génération d’orchestrations web service. Les résultats montrent que notre framework génère systématiquement des solutions effectives dans des domaines de modélisation à partir de cas d’étude significatifsScientific discovery often culminates into representing structure in nature as networks (graphs) of objects. For instance, certain biological reaction networks aim to represent living processes such as burning fat or switching genes on/off. Knowledge from experiments, data analysis and mental tacit lead to the discovery of such effective structures in nature. Can this process of scientific discovery using various sources of knowledge be automated? In this thesis, we address the same question in the contemporary context of model-driven engineering (MDE) of complex software systems. MDE aims to grease the wheels of complex software creation using first class artifacts called models. Very much like the process of effective structure discovery in science a modeler creates effective models, representing useful software artifacts, in a modelling domain. In this thesis, we consider two such modelling domains: metamodels for modelling languages and feature diagrams for Software Product Lines (SPLs). Can we automate effective model discovery in a modelling domain? The central challenge in discovery is the automatic generation of models. Models are graphs of inter-connected objects with constraints on their structure and the data contained in them. These constraints are enforced by a modelling domain and heterogeneous sources of knowledge including several well-formedness rules. How can we automatically generate models that simultaneously satisfy these constraints? In this thesis, we present a model-driven framework to answer this question. The framework for automatic model discovery uses heterogeneous sources of knowledge to first setup a concise and relevant subset of a modelling domain specification called the effective modelling domain. Next, it transforms the effective modelling domain defined in possibly different languages to a constraint satisfaction problem in the unique formal specification language Alloy. Finally, the framework invokes a solver on the Alloy model to generate one or more effective models. We embody the framework in two tools: Cartier for model discovery in any modelling language and Avishkar for product discovery in a SPL. We validate our framework through rigorous experiments in test model generation, partial model completion, product generation in SPLs, and generation of web-service orchestrations. The results qualify that our framework consistently generates effective findings in modelling domains from commensurate case studies
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Liao, Te-Chih, and 廖得志. "New LCD-TV LED Backlight Driver Circuit Module Design." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/12403200046454449179.
Full textAbstract:
碩士元智大學
電機工程學系
99
ABSTRACT In the carbon reduction of environmental consensus, unlike the traditional backlighting elements (such as CCFL), the lower power consumption of the LED has become a new generation of LCD TV backlight trend. Compared to the application of monitor, TV as a larger size, they need more strings of the LED backlight modules to achieve the required brightness of the LED control and on it’s multi-serial LED strings. The first problem is the current imbalances will be encountered among LED strings. The imbalance will cause the serial current uneven brightness, and thus the image quality. How to reach a balance under the given cost and getting the current balance among the LED strings, will be a challenge to for LED driver designers. Conventional AC load multiple drivers [ such as CCFL, EEFL ( External Electrode Fluorescent Lamp ), etc. ] often connected passive components in each group sharing the loads among AC power input, so one can achieve multiple AC load flow with current balance. This thesis proposes a lower power loss and cheaper method LED driver module for a typical 60” LED TV. For balancing the multiple LED strings, the LCD-TV LED driver circuit prototype design with passive components used in the DC load current connection. In addition, the circuit outputs data and waveforms were also measured. The AC power connecting with a rectifier can provide the DC power for the DC loads. By the connection of passive components, it will get the current balance among the DC loads. This thesis uses a LLC resonant converter design integrated with "A power supply with a H- balance LED driver for the multiple DC loads." The main purpose of the new power module for LED driver is to provide a cheaper and also efficient power supply circuit for current balance. Different from the traditional with linear structure, the new design can have current balance in each group of DC loads and the same brightness, the lower power consumption and high efficiency. The new design has relatively few components and low complexity, and substantial cost savings. With the actual measurements, we will measure and evaluate the performance of the new LED driver design with current balance circuits.
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Wu, Chih-hung, and 吳志宏. "DESIGN OF LED BACKLIGHT CIRCUIT MODULE FOR LCD-MONITOR." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/85132301767942524568.
Full textAbstract:
碩士大同大學
電機工程學系(所)
98
A LED arrays driver circuit of module is proposed, and is used in the backlight of LCD-monitor and illumination system. As constant-power dissipation curve, calculate the optimal voltage and current and determine the appropriate LED arrays. With Fly-back converter to be a AC to DC power supply and get the fixed voltage (12V) by pulse width modulation (PWM) of current feedback mode, then adopt the Boost converter to arise the voltage. Depend on feedback of LED arrays and generate the driver voltage. In order to reduce the luminance difference between each LED, this makes stable current of LED arrays by current mirror. And using the dynamic select function let LED arrays light at the same. The feature of this circuit is module design that applies various LED backlight models and generates the applicable voltage and stable current then achieve the common-design purpose.
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Yao, Yuan-Jung, and 姚源榕. "Two-Dimensional LED Tandem Backlight Module for Large Scale Scanning LCD." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/89530645016184727553.
Full textAbstract:
碩士國立交通大學
電機學院光電顯示科技產業專班
96
The aim of this thesis is to utilize tandem wedge shaped light guides to accomplish the large scale scanning field-sequential-color liquid crystal display. The field-sequential-color system has a lot of advantages such as high efficiency, high color gamut. However, due to the response time of the liquid crystal is insufficient fast, the duty cycle of the light source is restricted. This situation leads to luminance reduction especially in large size application. In order to overcome this issue, the scanning field-sequential-color backlight system is proposed. In this system, the color state is sequentially scanned from up to down during a whole frame. Nevertheless, if the conventional light guide is used to perform the scanning field-sequential-color backlight module, two different color states will appear on the screen simultaneously. The light penetration will occur inside the light guide, and that will lead the image color distortion. For this reason, each scanning partition of the field-sequential-color scanning backlight application should be an isolated segment to avoid the color mixing error. Based on this purpose, the tandem wedge shaped light guides are assembled to realize large scale application. Through the experiment, the uniformity by 9 points of LG was 84% associated with the brightness enhance film and diffuser. The FHWM (Full Width at Half Maximum) of the extraction light is �b30 degree in scanning direction. The leakage from the illuminated block to the adjacent stripes is only 9.8%.
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Chou, Yong-Wen, and 周詠紋. "Design of Side-View-White-LED used for LCD Backlight Module." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/09879582940742900604.
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Lee, Kuo-Chih, and 李國志. "Design，Simulation and Analysis of LCD backlight module base on LED." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/43763113739391964044.
Full textAbstract:
碩士長庚大學
光電工程研究所
94
Use LED to make the backlight source of LCD to have many excellences, such as slight weight, thin thickness, reduction the electricity,no radiation、no mercury,long life, etc.. It is the mainstream of the display under 20 inches in the future. It can be apply to the LCD of 3C products extensively, such as the notebook ,digital camera, mobile phone, ViewCAM, etc.. This thesis, we develop dot pattern on the light guide plate to scatter, in order to improve brightness of panel , with increasing out the homogeneity of the luminance of the panel, however we divide dot pattern into two parts: (1)Density does not have regular but size have regular (2)Size does not have regular but density have regular. We make use of optics software ASAP to design module, to simulate and analysis it, We use white light LED as the light source, and adopt the sidelight type structure, LGP is the associations of the form of two wedge templates, The baseplate of LGP spread dot pattern, and we change density of dot pattern, The result shows that over 85％ uniformity of best brightness and LED light source efficiency of utilization up to 70% .
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LAI, SHIH-JUNG, and 賴世榮. "Improvement of Uniformity of LED Back Light Module in TFT-LCD." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/47573982074220918110.
Full textAbstract:
碩士逢甲大學
機械工程學所
97
Backlight Module is one of the most important devices used in LCD panel. How to improve its performance is the main research topic. In this study, improving uniformity of back light module by LED using in TFT-LCD is investigated. Taguchi method is used as analysis method. According Taguchi methods, the main effect factors are obtained from measurement methods, equipments, working environment, artificial operation, and material properties. Use these effect parameter to perform real deeds analysis and then to find out factors for improvement. And then it could promote of uniformity of back light module by LED using in TFT-LCD. From the results, it is found: (1) Increasing angles of light guides and using lower transmissive diffusers would have better uniformity. (2) Angle of light going to light guide is the most important factor of uniformity. (3) Light guides and diffusers are two significant devices affecting uniformity. Light guides can be designed and fabricated by users. Therefore, design of light guide is most significant. According to the above-mentioned methods, it is shown that the Taguchi method can be effectively applied to promote of uniformity of back light module by LED using in TFT-LCD. And it finds out the affecting main conditions about uniformity of back light module by LED using in TFT-LCD. Therefore, such results can be used for further design of light guides.
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Lin, I.-Hsin, and 林益新. "Design of white LED light source for noble LCD backlight module." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/52696304394046226086.
Full textAbstract:
碩士元智大學
電機工程學系
95
A brand new design concept is presented in this thesis. In this design, the white LED light source is located in the counter angle and the shape of light guide plate (LGP) has been modified. We adopt the uniform dot pattern and concave surface in the LGP. Using R-cut light entering surface and TracePro simulation, we are able to increase the emission efficiency from 53% to 74%.
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Li, Tung-Yen, and 李東諺. "Development of LED Module and Optical Interference Technology for TFT-LCD Applications." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/06840965574085265079.
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博士國立中央大學
電機工程學系
101
Recently, TFT-LCD is the most popular display application in the flat panel display application. The main parts in the TFT-LCD system includes: LCD panel module, backlight module and electronic driver module. This paper provides the novel design of direct-in backlight module of the TFT-LCD system and the inspection method for the gap mura defect of the LCD panel. We applied the LED light source, secondary light-guide component and micro reflector structure to design the novel backlight module. Compared with West’s work in 2003, the uniformity ratio for our new design shows an increase of 24%, from 60% to 84%, and the luminance a 23.29% improvement, from 10 000 nits to 12 329 nits. On the other hand, we combine the optical interference method and neural network classification to detect the gap mura defect of the LCD panel. Three kinds of mura defects including non-uniformity sealant panel; panel with foreign material and fiber-cluster panel are tested. After learning process of Neural Network Classification method, the Mean Squared Error could decrease less than 0.01. By this method, we could sort out the bad panel and increase the yield rate of the production line.
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張婉茹. "The Construction of Due Date Promising Model for TFT-LCD Module Assembly." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/58262532049130917985.
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碩士明新科技大學
工程管理研究所
93
There are three processing sections in Thin Film Transistor Liquid Crystal Display Fabrication, named Array, Cell, and Module. And each has specific manufacturing characteristics and respective management focuses. For capital intensive, high machine utilization is the common production target in the Array and Cell processing sections. Therefore, Make-To-Stock is a popular adopted order fulfillment strategy. However, in the Module processing area, it works like component assembly and material planning got to be considered before work order is released. In this paper, we develop a due date promising model for customer order. When the order due date promising model is triggered, material and capacity constrains is considered sequentially. Furthermore, this due date promising model is realized by VB program. In the final verification, the result shows that this model can provide a quick and reliable promised delivery date than the past researches have made.
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Hu, Yu-Chi, and 胡育旗. "The Production Planning and Scheduling Model for TFT-LCD Assembly Module site." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/83850444840975886604.
Full textAbstract:
碩士東海大學
工業工程與經營資訊學系
95
The manufacturing process of TFT-LCD (Thin Film Transistor-Liquid Crystal Display) industry can be divided into three main segments: array, cell, and module. The module process is the final segment which has to directly fulfill customer’s uncertainty demands and has many distinct manufacturing sites. Besides, the module process has three specific production characteristics: (1) the products which customer require has the different grades; (2) the material requirements of each product have alternative BOM; (3) the module site facilities can re-allocate the materials to each other to fulfill the customer demands. However, there is not any research to solve the three production characteristics simultaneously. And the TFT-LCD industry is the Assemble To Order (ATO) production model. This research considers the material constraint, capacity constraint, and the production characteristics which mention above, employing the mathematical programming to construct the multi-site production planning and scheduling model for TFT-LCD module site under the given information (demands and each site’s material/ capacity supply). The objective of the model is to minimize the integrated manufacturing costs. In this research, we construct the mathematical model employing CPLEX. By means of experimentation, we can get the suitable range of the model. Compare with other method by illustration, the model has better performance than others at the three characteristics in the production planning and scheduling.
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Chen, Shao-Yu, and 陳少宇. "Thermal Analysis of LED Module." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/02761013384750398459.
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碩士國立成功大學
工程科學系碩博士班
94
Following the improvement in luminous of light emitting diodes’(LEDs) luminous, LEDs favored by the light source market day by day. However, as the evolution of ICs, the evolution of LED also encounters the serious heat dissipation problems. So this research utilize ANSYS finite element analysis software and Taguchi methods to do analyze thermal features of LED cooling module. Four kinds of different parameters and three kinds of parameter levels are used to probe parameters’ influence on junction temperature and LEDs’ largest displacement, separately. The four parameters are thickness of MCPCB’s metal layer, materials of MCPCB’s metal layer, thickness of MCPCB’s dielectric layer, and the number of screws respectively. For junction temperature, the influence of metal layer’s thickness is the greatest, the influence of dielectric layer’s thickness is the smallest. For LEDs’ greatest displacement, the influence of metal layer’s material is the greatest, the influence of dielectric layer’s thickness is the smallest. In Taguchi improve module, the junction temperature can be reduced by 3.6%, the number of the screws can also be reduced, but LEDs’ greatest displacement will increase 0.002mm.
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Chen, Wen-fei, and 陳雯斐. "A Study on Reducing LED Amount Used in 14 Inches LCD Back Light Module." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/10241249648796741059.
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碩士國立中山大學
機械與機電工程學系研究所
98
In this study, the optical simulation software Light Tools was executed to reduce the LED amount used by improving the performance of light guide plate of backlight module with LED illuminator. The improvement of the design including: 1.replacing the V-cut microstructures on the lower layer of the light guide plate by the micro-semispherical lens structures;2.replacing the diffusion film by the micro-semispherical lens structures on the upper layer of the light guide plate ; 3.adding the lateral microstructure on the light guide plate to reduce the dark-area phenomenon. The sizes of upper/lower microstructures, their spacings and the amount of LED were selected as the parameters and applying L18 orthogonal array to process the simulations firstly. Then integrating different kind of lateral microstructures to find the best uniformity, and obtain a set of parameters that could improve the performance of backlight module and then the amount of LED can be reduced. The results show that the uniformity of backlight module is over 88% without diffusion film which have overcome the requirement of 85% in traditional design with 2 diffusion films. This improvement not only reduces the cost from diffusion film, also removes the dark-area phenomenon. Additionally, the amount of LED is reduced to 45 from 48 that retrench about 7% of power. Energy and cost are saved simultaneously.
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鄭欣怡. "Implementation of the LCM Process Order Promise Model for TFT-LCD Module Site." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/76088629223879583244.
Full textAbstract:
碩士明新科技大學
工程管理研究所
94
There are three processing sections, Array, Cell, and Module, in Thin Film Transistor Liquid Crystal Display Fabrication. And each has specific manufacturing characteristics and respective management focuses. For capital intensive, high machine utilization is the common adopted production target in the Array and Cell processing sections. Therefore, Assembly-To-Order is a popular adopted order fulfillment strategy. However, in the Module processing area, it works like component assembly and material planning that must be considered before work order is released. In this paper, we develop a delivery date promising model for LCM assembly. This model considers material and capacity constraints. We adopt Forward and backward scheduling technique to determine the machine slack times which used for capacity promising. When the order due date promising model is triggered, material and capacity constrains is considered sequentially. Furthermore, this delivery date promising model is realized by DELPHI language and ACCESS 2003 database. In the final verification, the result shows that this model can provide a realistic order promising date.
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Chen, Shi-an, and 陳石安. "High Efficient LED Back Light Module." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/35709647632264599300.
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碩士國立高雄應用科技大學
電子工程系
98
Traditional Light bar using in Light-Emitting-Diode（LED） backlight is applied by the long edge side-lighting of backlight module. In order to achieve high brightness, high uniformity of the LED backlight, you need to arrange a line of LED light source light bar. With the improvement of semiconductor manufacturing process, the LED’s luminous efficiency has been superior to the Cold-Cathode-Fluorescent-Lamp（CCFL）, and then a substantial upgrade in LED's luminous efficiency has reduced the number of LED using in backlight module, although it can reduce the backlight module cost. Because of high brightness LED's characteristic, it may let the backlight module arise the thermal issue with hot-spot and shadow phenomenon. Therefore, I bring up using LED combine with Flexible-Printed Circuit board（FPC） and applied it to the short edge side-lighting of backlight module. It can decrease 50% reduction in the number of LED and increase brightness 25%, lifetime expectancy increased almost 150% by the long edge side-lighting backlight module. Its way will decrease the number of LED in using the short edge side-lighting and can be arranged more closely, collocated with a pattern design for light guide plate（LGP）. As that design can have the solve to the hot-spot and shadow phenomenon of backlight module, reaching the perfect optical uniformity. In LED light bar layout design, using new solder pad with solder paste stencil to control LED in the X, Y, Z axis offset of 0.1mm in the range, reducing the decay of optical and regional brightness issues caused by gap and perspective in LGP assembly. And it also reduce LED Light bar rework problem and costs of manufacturing. The short edge side-lighting of backlight module not only reduces the cost, but also enhances the lifetime, brightness efficiency and reliability. It will achieve the target of high quality and high efficient LED back light module.
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Huang, Lu-Si, and 黃露嬉. "Equity Valuation Model of LED Industry." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/22149146360971692083.
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碩士國立雲林科技大學
會計系碩士班
100
This paper discusses other information as part of Ohlson (1995) evaluation model to be the effective operation of the light emitting diode (Light Emitting Diode, LED) industry companies the object of empirical analysis. When Ohlson equity valuation model proposed, there is many study based on this model; except for the additional information part of how to do research is very rare, most people do not know how to operationalize. In this study, relatively high proportion of the value of other information, and the recent booming LED industry analysis, try to give other information of value to effect the efficient operation of the method. Attempt to distinguish the other information four dimensions, the company, the industrial, overall, regulations and the policy side, respectively. Companies proxy variables include capacity utilization, technological development, the management team, financial leverage; the industrial proxy variables including industry, the supply; the overall proxy variables include gross domestic product, international oil prices, consumers price index, exchange rates, interest rates. The results show that the company face of capacity utilization was significantly positively correlated with the value of the company, the industrial and industry conditions and the supply was also a significant positive correlation, interest rate of the overall surface variables and the variables of the regulations and policies was positively correlated with the value of the company believe that through the analysis in this paper can provide the practical and academic circles to how it should be for other information part of the operating reference.
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孔祥宇. "LED Illumination Module Design without Glare." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/8p2ph4.
Full textAbstract:
碩士逢甲大學
資訊電機工程碩士在職專班
102
So far, the development of illumination lamp light source has changed from tungsten lamp to Light emitting diode, The main discuss of this thesis using the geometrical optics theorem that including the refraction and reflection principle to design the LED lens of large light-emitting angle, and to utilize the optical simulation software that could optimize, design and analyze the optical field, it could arrive the light-emitting field that has high-effective and large-angle. The harmless and glare less design for adult is practical application with a sin-form wave film.
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Ming-YuanHo and 何明原. "Improvement in Color Shift of TFT-LCD Using LED Backlight Module with 6500K Color Temperature." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/39208180216811761950.
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碩士國立成功大學
電機工程學系專班
100
This study is to research for the analysis and improvement of TFT-LCD color shift. We change properties of color, including value、hue and chroma in the basic properties of color. Such as, the color distribution of the display gamma curve, backlight's led bin and saturation of the color filters, to analyze the impact of TFT-LCD color shift. The method of experimental is to change the color parameters of TFT-LCD. We use the color analyzer CA-210 to measure the three primary colors of TFT-LCD stimulus value through the color shift formula and obtain the delta E of TFT-LCD color shift. We analysis the delta E of different color parameters to identify the reason for the TFT-LCD color shift, and propose the appropriate and less cost solutions to improve the TFT-LCD color shift, and comply with the specifications developed by the IEC association. The experimental method in improvement TFT-LCD color shift, in the first is selected closer to the LED backlight module with 6500K to reduce the overall color shift value of TFT-LCD. Then adjustment Gamma Curve of TFT-LCD, in the first, adjust the Gamma curve of red and green which to meet gamma equal to 2.2 to reduce the color shift of reddish and greenish, in the finally, adjust Gamma curve of Blue to reduce variational amplitude of Color temperature. We improve the delta E of TFT-LCD color shift which can effectively reduce the average delta E to less than 3. In the study, we propose the method in improvement TFT-LCD color shift can effective use in the LED backlight, so that users can actually watch the image of the display to convey.
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Wang, Yen-Chun, and 王彥淳. "Research of mixed-light control for RGB and White light LED on LCD backlight module." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/sy37wu.
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碩士國立虎尾科技大學
電機工程研究所
99
In this thesis, a RGBW backlight control module is developed based on W-LED along with RGB-LED. Using PSoC and digital level dimming circuit to develop a RGBW-LED backlight module which has color temperature control. The quantitative analysis and control of mixed–light technology for RGBW LED based on digital color level control technique is proposed and studied to output white light by rapidly adjusting xy chromaticity diagram into black body locus. Accordingly, the brightness and color-shifting problems resulted from temperature-rise of RGBW-LED can be improved and overcome. A high efficiency power supply is an essential prerequisite for a high-performance mixed-light LED backlight source. Apart from being energy-conserved, the voltage fluctuation caused by RGBW LED output change must be prevented as well. The research is engaged in the improvement and implementation of large-sized LED backlight source and a 16" backlight source is developed in module. The purpose of wide color space and high brightness for RGBW-LED backlight module can be completed.
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Chen, Yu-shen, and 陳禹伸. "The Study of LED Light Bar for Small and Medium Size LCD Back Light Module." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/h36j53.
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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
In recent years, as the share of light emitting diodes (LED) being applied as the backlight of LCD grows higher to achieve thinner model in the market, the technique of LED started to replace traditional FFC tubes and became a key target. Since there are many patterns of LED and chips, this aim of this research is to find the design pattern which matches best. The size of monitor used with computer in current market is about 18.5-24 inches. Monitors sized above 26 inches are mainly used as television. This research is focused on the light source of computers and can be divided into two sections. The first section studies the applied theory of optics to estimate any optical phenomenon during luminescence of LED according to light efficiency and material properties while the second section measures the thermal resistance on the base board of LED light bar to verify the dependence of certain LED material based on the knowledge of thermal resistance. Finally, the light efficiency of LED and verified data of base board will be compared with the specification of LCM module in experiment in order to confirm that the LED compartments and base board design in edge type backlight module is the best design pattern.
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Kuo, Yi-Hsin, and 郭亦心. "A Study of Multi-Model Assembly Line Balancing Problem for TFT-LCD Module Process." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/rvcu2n.
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碩士國立清華大學
工業工程與工程管理學系所
105
In the Thin Film Transistor-Liquid Crystal Display (TFT-LCD) industry, the module process is labor intensive, as it is more difficult to apply automation to this process, compared with Array, Color filter, and Cell processes. In addition, module process is considered a multi-model assembly line, which means several models from a basic product family are manufactured simultaneously. Therefore, a module process with integrated arrangement and line-balancing can reduce labor requirement and increase production efficiency. This research considered several practical characteristics of the TFT-LCD module process, including multi-skilled operators and operator efficiency, to solve a multi-model assembly line balancing (MuMALB) problem. A new mathematical model was proposed to arrange labors, tasks, workstations, and machines. Furthermore, data from the TFT-LCD module factories were used to evaluate the performance of heuristic two-phase adaptive genetic algorithm (AGA) based on experimental design and response surface method. This study integrated theoretical research and practical application to develop a heuristic two-phase AGA for assembly line balancing problem for the TFT-LCD module process. Hence, the efficiency could be improved, and the cost could be reduced, which would ultimately improve the global competitiveness of TFT-LCD manufacturers of our country.
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Hsieh, Tien-Ghin, and 謝天嘉. "Design for LED 7-inch Backlight Module." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/44638981029945999648.
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碩士國立清華大學
產業研發碩士積體電路設計專班
95
Backlights illuminate the LCD panels from the rear, and generally consist of a light source and optical components. Mass LCD backlights have used cold-cathode florescent lamps (CCFL) for this purpose, but now we are switching to LEDs. We only convert the light source of CCFL into LEDs. We use AutoCAD software to establish 7-inch backlight modules and analyze optical characteristics of 7-inch backlight modules in TracePro software. Four steps for designing LED 7 inch backlight are below: Step one: Model 7-inch backlight modules in AutoCAD. Step two: Find the uniform output plane using CCFL light source in TracePro software. Step three: Instead of CCFL, we use White LED for light source. Step four: Use three RGB colors LEDs generating white light. Finally, we can get three types of 7-inch backlight modules. Three types of 7-inch backlight modules are CCFL backlight modules, White light LED backlight modules, and Three RGB colors LED backlight modules.
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Lu, De-Gang, and 盧德剛. "Color Mixing Design of LED Backlight Module." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/97660056278970620761.
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Wu, Pei-Chen, and 吳珮禎. "Design of LED Direct-Lighting Backlight Module." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/86903061061034635469.
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Lin, Cing-Liang, and 林清良. "Study on Thermal Module of LED Headlight." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/06857803909253548943.
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碩士國立高雄第一科技大學
機械與自動化工程研究所
100
In recent years, LED as the global environmental awareness is high and the green to the energy crisis facing the subject, LED has gradually been public attention. in addition to the advantages of its lightweight, long life, low pollution and low power consumption, and of good earthquake-resistant durability. Therefore the application of high power LED as lightning source becomes popular. Its applications in automobile headlamp in particular. The engine room is a high temperature environment. High temperatures will reduce the luminous efficiency and lifetime of LEDs. Thus, designing a high efficiency thermal module is important in LED headlamp application in automobiles. In this study, the car engine produce suction to drive gas manner, to design carried out in gas convection thermal module. The finite element analysis software of high-power LED applications in the thermal module of heat and mass transfer characteristics. With the finite element analysis software to investigate the heat transfer characteristics of high power LEDs used in the thermal module. Its design parameters of thermal modules for fin diameter, length, texture, thermal grease 4 factor, and joined to harsh conditions of vehicle operation time parameter analysis and simulation to identify optimal thermal module parameters. The last to experiment will simulate the real car environment. Experimental results show car produced by an engine driven suction inlet air temperature at 70℃(relative to the engine room temperature) and at room temperature 25℃. Relative average temperature of the LED chip measured as 84.02℃ and 51.09 ℃, differences up to 4.7 times of their life. From the results show effects of inlet temperature on LED chip temperature. If as in the use of car air intake location close to better weather temperature.
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Hou, Chih Teng, and 侯智騰. "Liquid Encapsulated RGB-Stack LED Power Module." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/78146842521719835462.
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