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Journal articles on the topic 'Capacitive Touch Sensors'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Zuk, Samuel, Alena Pietrikova, and Igor Vehec. "Capacitive touch sensor." Microelectronics International 35, no. 3 (July 2, 2018): 153–57. http://dx.doi.org/10.1108/mi-12-2017-0071.

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Purpose The purpose of this paper is to analyse the possibilities of mechanical switch replacement by capacitive film touch sensor in applications requiring high reliability and short response time. Advantage of replacing mechanical switch by capacitive touch sensor is no mechanical wear and possible implementation of sensor in application where the switch could not be used or where the flexibility of the sensor substrate is required. The aim of this work is to develop a capacitive touch sensor with the advantage of maximum mechanical resistance, short response time and high sensitivity. Design/methodology/approach Based on various possible sensors layouts, the authors realized 18 different (14 self-capacitance and four mutual capacitance) topologies of capacitive sensor for touch applications. Three different technologies – PCB, LTCC and polymer technology – were used to characterize sensor’s behaviour. For precise characterization of different layouts realized on various substrates, the authors used integrated circuit FDC2214 capacitance-to-digital converter. Findings Sensing range of the capacitive touch (proximity) sensor is affected by the per cent of area covered by the sensor, and it does not depend on topology of sensor. The highest sensing range offers PCB technology. Flexible substrates can be used as proper substituent to rigid PCB. Originality/value The novelty of this work lies in finding the touch capacitive sensors that allow shorter switching times compared to standard mechanical switches.

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2

Ko, Wen H., and Qiang Wang. "Touch mode capacitive pressure sensors." Sensors and Actuators A: Physical 75, no. 3 (June 1999): 242–51. http://dx.doi.org/10.1016/s0924-4247(99)00069-2.

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3

Vallett, Richard, Ryan Young, Chelsea Knittel, Youngmoo Kim, and Genevieve Dion. "Development of a Carbon Fiber Knitted Capacitive Touch Sensor." MRS Advances 1, no. 38 (2016): 2641–51. http://dx.doi.org/10.1557/adv.2016.498.

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ABSTRACTTextiles, in combination with advances in materials and design, offer exciting new possibilities for human and environmental interaction, including biometric and touch-based sensing. Previous fabric-based or flexible touch sensors have generally required a large number of sensing electrodes positioned in a dense XY grid configuration and a multitude of wires. This paper investigates the design and manufacturing of a planar (two-dimensional, XY location) touch fabric sensor with only two electrodes (wires) to sense both planar touch and pressure, making it ideal for applications with limited space/complexity for wiring. The proposed knitted structure incorporates a supplementary method of sensing to detect human touch on the fabric surface, which offers advantages over previous methods of touch localization through an efficient use of wire connections and sensing materials. This structure is easily manufactured as a single component utilizing flatbed knitting techniques and electrically conductive yarns. The design requires no embedded electronics or solid components in the fabric, which allows the sensor to be flexible and resilient. This paper discusses the design, fabrication, sensing methods, and applications of the fabric sensor in robotics and human-machine interaction, smart garments, and wearables, as well as the highly transdisciplinary approach pursued in developing medical textiles and flexible embedded sensors.

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4

Kwon, Oh-Kyong, Jae-Sung An, and Seong-Kwan Hong. "Capacitive Touch Systems With Styli for Touch Sensors: A Review." IEEE Sensors Journal 18, no. 12 (June 15, 2018): 4832–46. http://dx.doi.org/10.1109/jsen.2018.2830660.

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5

Wang, Qiang, and Wen H. Ko. "Modeling of touch mode capacitive sensors and diaphragms." Sensors and Actuators A: Physical 75, no. 3 (June 1999): 230–41. http://dx.doi.org/10.1016/s0924-4247(99)00068-0.

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6

Guo, Xue. "3D Multi-Touch Screen Based on Pressure Sensor." Applied Mechanics and Materials 513-517 (February 2014): 4064–67. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.4064.

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This paper describes a 3D multi-touch screen based on pressure sensor. Aiming at the disadvantage of traditional capacitive touch screen such as detection errors and inaccurate positioning caused by environmental impact, the multi-touch screen in this paper adds thin film pressure sensors and control chips on the ordinary capacitance touch screen, which can obtain the number and location of touch points and the corresponding touch pressure. This 3D Multi-touch screen is simple and compact in structure, improves the accuracy of touch detection effectively and realizes the 3D multi-touch operation, it's safe and reliable.

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7

Harnett, Cindy. "Making Soft Optical Sensors More Wearable." MRS Advances 5, no. 18-19 (2020): 1017–22. http://dx.doi.org/10.1557/adv.2020.64.

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ABSTRACTThis paper discusses new components and approaches to make stretchable optical fiber sensors better meet the power and washability requirements of wearables. First, an all-polymer quick connector allows the light source and photosensor to be quickly detached for washing. Second, the paper investigates the possibility of driving the sensors using ambient light instead of an onboard light source. While optical strain sensors and touch sensors have advantages over electronic ones in wet environments, and the intrinsic stretchability of the fibers is useful for soft robotics and highly conformal wearables, the typical light-emitting diode (LED) light source consumes more power than an electronic resistive or capacitive strain sensor. In this work, ambient light of uniform but unknown intensity is demonstrated to drive an elastomeric optical touch sensor in a differential configuration.

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8

Hwu, Chen Chuan, and Jui Lin Hsu. "Shielding Method for the Capacitive Touch-Sensor." Applied Mechanics and Materials 300-301 (February 2013): 464–67. http://dx.doi.org/10.4028/www.scientific.net/amm.300-301.464.

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Capacitive touch technology has been widely used in various applications because it allows intuitive interfaces and is almost without service-life limitation. There are two major limitations of capacitive touch sensors: the sensitivity is low when the sensing area is small and the sensing penetration is poor when the mechanical structure is thick. Here, we propose a shielding strategy for capacitive touch technology to improve the two limitations of sensing sensitivity and penetration. Based on the same test conditions, our proposed approach can improve sensing sensitivity. Hence, our proposed approach allows the replacement of an experiment device with a 50 mm2 sensing area with one with a 7-mm2 sensing area when using a 4 mm-thick cover.

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9

Liu, Yu-Qing, Yong-Lai Zhang, Zhi-Zhen Jiao, Dong-Dong Han, and Hong-Bo Sun. "Directly drawing high-performance capacitive sensors on copying tissues." Nanoscale 10, no. 36 (2018): 17002–6. http://dx.doi.org/10.1039/c8nr05731a.

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10

Reynolds, Veronica G., Sanjoy Mukherjee, Renxuan Xie, Adam E. Levi, Amalie Atassi, Takumi Uchiyama, Hengbin Wang, Michael L. Chabinyc, and Christopher M. Bates. "Super-soft solvent-free bottlebrush elastomers for touch sensing." Materials Horizons 7, no. 1 (2020): 181–87. http://dx.doi.org/10.1039/c9mh00951e.

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11

Rahman, Md Taibur, Arya Rahimi, Subhanshu Gupta, and Rahul Panat. "Microscale additive manufacturing and modeling of interdigitated capacitive touch sensors." Sensors and Actuators A: Physical 248 (September 2016): 94–103. http://dx.doi.org/10.1016/j.sna.2016.07.014.

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12

Wang, Qiang, and Wen H. Ko. "Si-to-Si fusion bonded touch mode capacitive pressure sensors." Mechatronics 8, no. 5 (August 1998): 467–84. http://dx.doi.org/10.1016/s0957-4158(98)00013-0.

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13

Lee, Kilsoo, Jaehong Lee, Gwangmook Kim, Youngjae Kim, Subin Kang, Sungjun Cho, SeulGee Kim, et al. "Rough-Surface-Enabled Capacitive Pressure Sensors with 3D Touch Capability." Small 13, no. 43 (May 19, 2017): 1700368. http://dx.doi.org/10.1002/smll.201700368.

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14

Hussaini, Said, Hui Jiang, Paul Walsh, Dermot MacSweeney, and Kofi A. A. Makinwa. "A 15-nW per Sensor Interference-Immune Readout IC for Capacitive Touch Sensors." IEEE Journal of Solid-State Circuits 54, no. 7 (July 2019): 1874–82. http://dx.doi.org/10.1109/jssc.2019.2907041.

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15

Xie, Liping, Peng Chen, Shuo Chen, Kun Yu, and Hongbin Sun. "Low-Cost and Highly Sensitive Wearable Sensor Based on Napkin for Health Monitoring." Sensors 19, no. 15 (August 5, 2019): 3427. http://dx.doi.org/10.3390/s19153427.

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The development of sensors with high sensitivity, good flexibility, low cost, and capability of detecting multiple inputs is of great significance for wearable electronics. Herein, we report a napkin-based wearable capacitive sensor fabricated by a novel, low-cost, and facile strategy. The capacitive sensor is composed of two pieces of electrode plates manufactured by spontaneous assembly of silver nanowires (NWs) on a polydimethylsiloxane (PDMS)-patterned napkin. The sensor possesses high sensitivity (>7.492 kPa−1), low cost, and capability for simultaneous detection of multiple signals. We demonstrate that the capacitive sensor can be applied to identify a variety of human physiological signals, including finger motions, eye blinking, and minute wrist pulse. More interestingly, the capacitive sensor comfortably attached to the temple can simultaneously monitor eye blinking and blood pulse. The demonstrated sensor shows great prospects in the applications of human–machine interface, prosthetics, home-based healthcare, and flexible touch panels.

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16

Diaz-Alonso, Daniela, Mario Moreno-Moreno, Carlos Zuñiga, Joel Molina, Wilfrido Calleja, Juan Carlos Cisneros, Luis Niño de Rivera, et al. "Hermetic capacitive pressure sensors for biomedical applications." Microelectronics International 33, no. 2 (May 3, 2016): 79–86. http://dx.doi.org/10.1108/mi-05-2015-0046.

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Purpose This paper aims to purpose the new design and fabrication scheme of Touch Mode Capacitive Pressure Sensor (TMCPS), which can be used in a wireless integrated resistor, inductor and capacitor circuit for monitoring pressure in biomedical applications. Design/methodology/approach This study focuses on the design, simulation and fabrication of dynamic capacitors, based on surface micromachining using polysilicon or aluminum films as the top electrode, both structural materials are capped with a 1.5 μm-thick polyimide film. Findings The design of microstructures using a composite model fits perfectly the preset mechanical behavior. After the full fabrication, the dynamic capacitors show complete mechanical flexibility and stability. Originality/value The novelty of the method presented in this study includes two important aspects: first, the capacitors are designed as a planar cavity within a rigid frame, where two walls contain channels which allow for the etching of the sacrificial material. Second, the electromechanical structures are designed using a composite model that includes a polyimide film capping for a precise pressure sensing, which also protects the internal cavity and, at the same time, provides full biocompatibility.

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17

Park, Jong, Chang-Ju Lee, and Jong Kim. "Analysis of Multi-Level Simultaneous Driving Technique for Capacitive Touch Sensors." Sensors 17, no. 9 (September 2, 2017): 2016. http://dx.doi.org/10.3390/s17092016.

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18

Park, Jae Young, Jong Kang Park, Chang-Ju Lee, and Jong Tae Kim. "Inverted driving technique for removing display noise in capacitive touch sensors." IEICE Electronics Express 12, no. 19 (2015): 20150683. http://dx.doi.org/10.1587/elex.12.20150683.

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19

Fragiacomo, Giulio, Thor Ansbæk, Thomas Pedersen, Ole Hansen, and Erik V. Thomsen. "Analysis of small deflection touch mode behavior in capacitive pressure sensors." Sensors and Actuators A: Physical 161, no. 1-2 (June 2010): 114–19. http://dx.doi.org/10.1016/j.sna.2010.04.030.

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20

Han, Jeahyeong, and Mark A. Shannon. "Smooth Contact Capacitive Pressure Sensors in Touch- and Peeling-Mode Operation." IEEE Sensors Journal 9, no. 3 (March 2009): 199–206. http://dx.doi.org/10.1109/jsen.2008.2011090.

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21

Janardhanan, Shankaran, Joan Z. Delalic, Jeffrey Catchmark, and Dharanipal Saini. "Development of Biocompatible MEMS Wireless Capacitive Pressure Sensor." Journal of Microelectronics and Electronic Packaging 2, no. 4 (October 1, 2005): 287–96. http://dx.doi.org/10.4071/1551-4897-2.4.287.

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The objective of this research was to develop a wireless pressure sensor useful for monitoring bladder pressure. The wireless sensor consists of an active capacitive element and an inductor coil. The changes in pressure are related to the changes in the resonant frequency of the internal sensor. The existing pressure sensors have inductors formed on both sides of the substrate. The changes in internal capacitance of these sensors are related to the changes in pressure by impedance matching of the internal LC circuit. The deviation in bladder pressure is an important variable in evaluating the diseased state of the bladder. The inductor designed for this application is a spirally wound inductor fabricated adjacent to the capacitor. The external sensing uses equivalent changes in internal LC. The resonant frequency of the internal sensor is defined by the deformation of the plate, causing the plate to touch the dielectric on the fixed capacitive plate, which is reflected as changes in capacitance(C). The deformation of the plate has been modeled using Finite Element Analysis. The finite element analysis optimizes the dimensions of the design. Remote sensing is achieved through inductive coupling and the changes in pressure are determined. The device is tested for pressures ranging from 0–150 mmHg, bladder pressure. The RF Telemetry system has been modeled using Sonnet. The frequency range is between 100–670 MHz which is in compliance to that specified by Federal Communications Commission (FCC) regulations.

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22

Kanda, Eiji, Tsukasa Eguchi, Yasunori Hiyoshi, Taketo Chino, Yasushi Tsuchiya, Takahiro Iwashita, Tokuro Ozawa, Takao Miyazawa, and Tomotaka Matsumoto. "55.2: Integrated Active Matrix Capacitive Sensors for Touch Panel LTPS-TFT LCDs." SID Symposium Digest of Technical Papers 39, no. 1 (2008): 834. http://dx.doi.org/10.1889/1.3069800.

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23

Park, Jong Kang, Chang-Ju Lee, Do-yeon Kim, Jung-Hoon Chun, and Jong Tae Kim. "Application of weighing matrices to simultaneous driving technique for capacitive touch sensors." IEEE Transactions on Consumer Electronics 61, no. 2 (May 2015): 261–69. http://dx.doi.org/10.1109/tce.2015.7150602.

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24

Yaragalla, Srinivasarao, Simeone Dussoni, Muhammad Zahid, Marco Maggiali, Giorgio Metta, Athanassia Athanasiou, and Ilker S. Bayer. "Stretchable graphene and carbon nanofiber capacitive touch sensors for robotic skin applications." Journal of Industrial and Engineering Chemistry 101 (September 2021): 348–58. http://dx.doi.org/10.1016/j.jiec.2021.05.048.

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25

Lee, Sang, and Sangyoon Lee. "Fabrication and Characterization of Roll-to-Roll Printed Air-Gap Touch Sensors." Polymers 11, no. 2 (February 2, 2019): 245. http://dx.doi.org/10.3390/polym11020245.

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Although printed electronics technology has been recently employed in the production of various devices, its use for the fabrication of electronic devices with air-gap structures remains challenging. This paper presents a productive roll-to-roll printed electronics method for the fabrication of capacitive touch sensors with air-gap structures. Each layer of the sensor was fabricated by printing or coating. The bottom electrode, and the dielectric and sacrificial layers were roll-to-roll slot-die coated on a flexible substrate. The top electrode was formed by roll-to-roll gravure printing, while the structural layer was formed by spin-coating. In particular, the sacrificial layer was coated with polyvinyl alcohol (PVA) and removed in water to form an air-gap. The successful formation of the air-gap was verified by field emission scanning electron microscopy (FE-SEM). Electrical characteristics of the air-gap touch sensor samples were analyzed in terms of sensitivity, hysteresis, and repeatability. Experimental results showed that the proposed method can be suitable for the fabrication of air-gap sensors by using the roll-to-roll printed electronics technology.

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26

Bae, Jihyun, and Kyung Hwa Hong. "Electrical properties of conductive fabrics for operating capacitive touch screen displays." Textile Research Journal 83, no. 4 (November 27, 2012): 329–36. http://dx.doi.org/10.1177/0040517512464298.

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Electrically conductive textiles have many potential applications, such as sensors, static charge dissipation, and electro-magnetic interference shields. In this study, two different types of core spun yarns were produced with silver-plated nylon filaments as the conductive material. The electrical characteristics of the core spun yarns and the fabric samples knitted with these yarns were investigated. It was clear that the surface resistance of each type of knitted fabric depends on the surface exposure of the conductive materials. However, both knit types exhibited reasonable features for application as a touching operator for capacitive touch screen panels.

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Dean, Robert, Aditi Rane, Colin Stevens, Michael Baginski, Zane Hartzog, and David Elton. "Implementing Fringing Field Sensors in PCB Technology." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2010, DPC (January 1, 2010): 000579–98. http://dx.doi.org/10.4071/2010dpc-ta22.

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Interdigitated electrode structures are well suited for realizing capacitors where a significant percentage of the total capacitance in due to the out of plane fringing fields. An object that interferes with the fringing fields will then change the measurable capacitance between the electrodes. Therefore this configuration can be used as a sensor for the object that interferes with the fringing fields and is called a capacitive fringing field sensor. These types of sensors have been used in many applications, such as water detection, moisture content measurement and as proximity switches. Printed circuit board (PCB) technology is particularly useful for realizing this type of sensor architecture. The interdigitated electrode structures can be patterned in the Cu cladding on one or both sides of the substrate. The solder mask coating can then be used to insulate the electrodes to prevent shorting in the presence of water or other conductive substances. The size and spacing of the electrode structures can be optimized to adjust the sensitivity of the sensor to the measurand of interest. The implementation of this type of sensor in PCB technology has several advantages when compared to traditional MEMS technologies. External electronics can readily be attached to the PCB substrate. Very large sensor panels can be manufactured easily and economically. Other types of MEMS sensors have been implemented in PCB technology in recent years. This sensor is compatible with those types of sensors and could be used to augment sensor suites implemented in PCB MEMS technology. Demonstration prototype fringing field sensors were implemented in PCB technology for measuring the mass of small quantities of water, for measuring soil moisture content and for use as capacitive touch switches.

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28

Jang, Jiuk, Yoon Sun Jun, Hunkyu Seo, Moohyun Kim, and Jang-Ung Park. "Motion Detection Using Tactile Sensors Based on Pressure-Sensitive Transistor Arrays." Sensors 20, no. 13 (June 28, 2020): 3624. http://dx.doi.org/10.3390/s20133624.

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In recent years, to develop more spontaneous and instant interfaces between a system and users, technology has evolved toward designing efficient and simple gesture recognition (GR) techniques. As a tool for acquiring human motion, a tactile sensor system, which converts the human touch signal into a single datum and executes a command by translating a bundle of data into a text language or triggering a preset sequence as a haptic motion, has been developed. The tactile sensor aims to collect comprehensive data on various motions, from the touch of a fingertip to large body movements. The sensor devices have different characteristics that are important for target applications. Furthermore, devices can be fabricated using various principles, and include piezoelectric, capacitive, piezoresistive, and field-effect transistor types, depending on the parameters to be achieved. Here, we introduce tactile sensors consisting of field-effect transistors (FETs). GR requires a process involving the acquisition of a large amount of data in an array rather than a single sensor, suggesting the importance of fabricating a tactile sensor as an array. In this case, an FET-type pressure sensor can exploit the advantages of active-matrix sensor arrays that allow high-array uniformity, high spatial contrast, and facile integration with electrical circuitry. We envision that tactile sensors based on FETs will be beneficial for GR as well as future applications, and these sensors will provide substantial opportunities for next-generation motion sensing systems.

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29

Meng, Guangqing, and Wen H. Ko. "Modeling of circular diaphragm and spreadsheet solution programming for touch mode capacitive sensors." Sensors and Actuators A: Physical 75, no. 1 (May 1999): 45–52. http://dx.doi.org/10.1016/s0924-4247(99)00055-2.

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30

Valasma, Ronja, Eva Bozo, Olli Pitkänen, Topias Järvinen, Aron Dombovari, Melinda Mohl, Gabriela Simone Lorite, Janos Kiss, Zoltan Konya, and Krisztian Kordas. "Grid-type transparent conductive thin films of carbon nanotubes as capacitive touch sensors." Nanotechnology 31, no. 30 (May 14, 2020): 305303. http://dx.doi.org/10.1088/1361-6528/ab8590.

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31

Cataldi, Pietro, Simeone Dussoni, Luca Ceseracciu, Marco Maggiali, Lorenzo Natale, Giorgio Metta, Athanassia Athanassiou, and Ilker S. Bayer. "Carbon Nanofiber versus Graphene-Based Stretchable Capacitive Touch Sensors for Artificial Electronic Skin." Advanced Science 5, no. 2 (December 27, 2017): 1700587. http://dx.doi.org/10.1002/advs.201700587.

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32

Zagkanas, Vasileios N., Dimitris A. Orlis, Christos G. Daskalou, George D. Bouzianas, and Carsten Temming. "11‐4: Invited Paper: Virtual Prototyping and Testing of Automotive Capacitive Touch Sensors." SID Symposium Digest of Technical Papers 51, no. 1 (August 2020): 142–45. http://dx.doi.org/10.1002/sdtp.13823.

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33

Liu, Wenjiang, Ru Liu, Pengfei Yu, Linrun Feng, and Xiaojun Guo. "Device/Circuit Mixed-Mode Simulations for Analysis and Design of Projected-Capacitive Touch Sensors." Journal of Display Technology 11, no. 2 (February 2015): 204–8. http://dx.doi.org/10.1109/jdt.2014.2370453.

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34

Cooper, Christopher B., Kuralamudhan Arutselvan, Ying Liu, Daniel Armstrong, Yiliang Lin, Mohammad Rashed Khan, Jan Genzer, and Michael D. Dickey. "Stretchable Capacitive Sensors of Torsion, Strain, and Touch Using Double Helix Liquid Metal Fibers." Advanced Functional Materials 27, no. 20 (March 23, 2017): 1605630. http://dx.doi.org/10.1002/adfm.201605630.

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35

Yang, Hyun Joon, Jin Yong Lee, and Woong-Ryeol Yu. "Carbon nanotube fiber assemblies with braided insulation layers for washable capacitive textile touch sensors." Functional Composites and Structures 2, no. 1 (April 2, 2020): 015007. http://dx.doi.org/10.1088/2631-6331/ab797f.

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36

Sell, Johannes K., Herbert Enser, Bernhard Jakoby, Michaela Schatzl-Linder, Bernhard Strauss, and Wolfgang Hilber. "Printed Embedded Transducers: Capacitive Touch Sensors Integrated Into the Organic Coating of Metalic Substrates." IEEE Sensors Journal 16, no. 19 (October 2016): 7101–8. http://dx.doi.org/10.1109/jsen.2016.2596791.

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37

Huang, Haiming, Junhao Lin, Linyuan Wu, Zhenkun Wen, and Mingjie Dong. "Trigger-Based Dexterous Operation with Multimodal Sensors for Soft Robotic Hand." Applied Sciences 11, no. 19 (September 26, 2021): 8978. http://dx.doi.org/10.3390/app11198978.

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This paper focuses on how to improve the operation ability of a soft robotic hand (SRH). A trigger-based dexterous operation (TDO) strategy with multimodal sensors is proposed to perform autonomous choice operations. The multimodal sensors include optical-based fiber curvature sensor (OFCS), gas pressure sensor (GPS), capacitive pressure contact sensor (CPCS), and resistance pressure contact sensor (RPCS). The OFCS embedded in the soft finger and the GPS series connected in the gas channel are used to detect the curvature of the finger. The CPCS attached on the fingertip and the RPCS attached on the palm are employed to detect the touch force. The framework of TDO is divided into sensor detection and action operation. Hardware layer, information acquisition layer, and decision layer form the sensor detection module; action selection layer, actuator drive layer, and hardware layer constitute the action operation module. An autonomous choice decision unit is used to connect the sensor detecting module and action operation module. The experiment results reveal that the TDO algorithm is effective and feasible, and the actions of grasping plastic framework, pinching roller ball pen and screwdriver, and handshake are executed exactly.

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38

Zhang, Min, Yichuan Wu, Xudong Wang, and Xiaohao Wang. "All-transparent graphene-based flexible pressure sensor array." International Journal of Modern Physics B 31, no. 07 (March 19, 2017): 1741009. http://dx.doi.org/10.1142/s0217979217410090.

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In this work, we propose and demonstrate a flexible capacitive tactile sensor array based on graphene served as electrodes. The sensor array consists of 3 × 3 units with 3 mm spatial resolution, similar to that of human skin. Each unit has three layers. The middle layer with microstructured PDMS served as an insulator is sandwiched by two perpendicular graphene-based electrodes. The size of each unit is 3 mm × 3 mm and the initial capacitance is about 0.2 pF. High sensitivities of 0.73 kPa[Formula: see text] between 0 and 1.2 kPa and 0.26 kPa[Formula: see text] between 1.2 and 2.5 kPa were achieved on the fabricated graphene pressure sensors. The proposed flexible pressure sensor array shows a great potential on the application of electric skin or 3D touch control.

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Liu, Shi-Yu, Yi-Jun Wang, Jian-Gang Lu, and Han-Ping D. Shieh. "38.3: One Glass Solution with a Single Layer of Sensors for Projected-Capacitive Touch Panels." SID Symposium Digest of Technical Papers 45, no. 1 (June 2014): 548–50. http://dx.doi.org/10.1002/j.2168-0159.2014.tb00143.x.

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40

Jindal, Sumit Kumar, M. Aditya Varma, and Deepali Thukral. "Study of MEMS Touch-Mode Capacitive Pressure Sensor Utilizing Flexible SiC Circular Diaphragm: Robust Design, Theoretical Modeling, Numerical Simulation and Performance Comparison." Journal of Circuits, Systems and Computers 28, no. 12 (November 2019): 1950206. http://dx.doi.org/10.1142/s0218126619502062.

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Copious research has been conducted on Capacitive Pressure Sensors over the decades with a focus on Silicon being the primary filming element. However, due to Silicon Carbide emerging as superior in harsh environmental conditions, the research is gravitating towards it for industrial applications. This work presents a new analytical model for a polycrystalline silicon carbide-based capacitive pressure sensor working in touch-mode operation. Carbide demonstrates properties like electrical stability, mechanical robustness and chemical inertness which puts it on the frontier of research. The mathematical model proposed is a simple yet powerful tool in manipulating design and sizing for fast analysis. It is quicker and bypasses the need for complex simulation software. The analysis is purely mathematical and hence the results are analyzed with MATLAB. The mathematical model developed is verified with a standard Finite Element Analysis (FEM) using COMSOL v5.2. The results of the mathematical analysis dovetail well with the FEM analysis and show a significant improvement in both the sensitivity and capacitance generated.

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41

An, Jae-Sung, Sang-Hyun Han, and Jae-Hun Ye. "A Sensing Mode Reconfigurable Analog Front-End IC for Capacitive Touch and a-IGZO TFT-Based Active-Matrix Capacitive Fingerprint Sensors." IEEE Sensors Journal 19, no. 23 (December 1, 2019): 11544–52. http://dx.doi.org/10.1109/jsen.2019.2935231.

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Kim, Piljoong, Sanghyun Han, Yunho Jung, and Seongjoo Lee. "A PAPR Reduction Technique for Fast Touch Sensors Adopting a Multiple Frequency Driving Method on Large Display Panels." Sensors 21, no. 2 (January 9, 2021): 429. http://dx.doi.org/10.3390/s21020429.

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The multiple frequency driving method (MFDM) capacitive touch system (CTS), which drives transmit (TX) electrodes in parallel, has been developed to improve the touch-sensitivity of large touch screens at high speed. However, when driving multiple TX electrodes at the same time, TX signals are merged through the touch panel, which results in increasing the peak-to-average power ratio (PAPR) of combined signals. Due to the high PAPR, the signal is distorted out of the power amplifier’s linear range, causing a touch malfunction. The MFDM CTS can avoid this problem by reducing the drive voltage or partially driving the TX electrodes in parallel. However, these methods cause a significant performance drop with respect to signal-to-noise ratio (SNR) in the MFDM systems. This paper proposes a stack method which reduces PAPR effectively without the performance degradation of MFDM and achieves real-time touch sensitivity in large display panels. The proposed method allocates a suitable phase for each TX electrode to reduce the peak power of combined signals. Instead of investigating all of the phases for the total number of TX electrodes, the optimal phase is estimated from the highest frequency to the lowest one and fixed one by one, which can reduce the required time to find a suitable phase considerably. As a result, it enables high-speed sensing of multi-touch on a large touch screen and effectively reduces PAPR to secure high signal-to-noise-ratio (SNR). Through experiments, it was verified that the proposed method in this paper has an SNR of 39.36 dB, achieving a gain of 19.35 and 5.98 dB compared to the existing touch system method and the algorithm used in the communication system, respectively.

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43

Kim, Piljoong, Sanghyun Han, Yunho Jung, and Seongjoo Lee. "A PAPR Reduction Technique for Fast Touch Sensors Adopting a Multiple Frequency Driving Method on Large Display Panels." Sensors 21, no. 2 (January 9, 2021): 429. http://dx.doi.org/10.3390/s21020429.

Full text

Abstract:

The multiple frequency driving method (MFDM) capacitive touch system (CTS), which drives transmit (TX) electrodes in parallel, has been developed to improve the touch-sensitivity of large touch screens at high speed. However, when driving multiple TX electrodes at the same time, TX signals are merged through the touch panel, which results in increasing the peak-to-average power ratio (PAPR) of combined signals. Due to the high PAPR, the signal is distorted out of the power amplifier’s linear range, causing a touch malfunction. The MFDM CTS can avoid this problem by reducing the drive voltage or partially driving the TX electrodes in parallel. However, these methods cause a significant performance drop with respect to signal-to-noise ratio (SNR) in the MFDM systems. This paper proposes a stack method which reduces PAPR effectively without the performance degradation of MFDM and achieves real-time touch sensitivity in large display panels. The proposed method allocates a suitable phase for each TX electrode to reduce the peak power of combined signals. Instead of investigating all of the phases for the total number of TX electrodes, the optimal phase is estimated from the highest frequency to the lowest one and fixed one by one, which can reduce the required time to find a suitable phase considerably. As a result, it enables high-speed sensing of multi-touch on a large touch screen and effectively reduces PAPR to secure high signal-to-noise-ratio (SNR). Through experiments, it was verified that the proposed method in this paper has an SNR of 39.36 dB, achieving a gain of 19.35 and 5.98 dB compared to the existing touch system method and the algorithm used in the communication system, respectively.

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Hernández-Sebastián, Natiely, Daniela Díaz-Alonso, Francisco Renero-Carrillo, Noé Villa-Villaseñor, and Wilfrido Calleja-Arriaga. "Design and Simulation of an Integrated Wireless Capacitive Sensors Array for Measuring Ventricular Pressure." Sensors 18, no. 9 (August 24, 2018): 2781. http://dx.doi.org/10.3390/s18092781.

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This paper reports the novel design of a touch mode capacitive pressure sensor (TMCPS) system with a wireless approach for a full-range continuous monitoring of ventricular pressure. The system consists of two modules: an implantable set and an external reading device. The implantable set, restricted to a 2 × 2 cm2 area, consists of a TMCPS array connected with a dual-layer coil, for making a reliable resonant circuit for communication with the external device. The capacitive array is modelled considering the small deflection regime for achieving a dynamic and full 5–300 mmHg pressure range. In this design, the two inductive-coupled modules are calculated considering proper electromagnetic alignment, based on two planar coils and considering the following: 13.56 MHz frequency to avoid tissue damage and three types of biological tissue as core (skin, fat and muscle). The system was validated with the Comsol Multiphysics and CoventorWare softwares; showing a 90% power transmission efficiency at a 3.5 cm distance between coils. The implantable module includes aluminum- and polyimide-based devices, which allows ergonomic, robust, reproducible, and technologically feasible integrated sensors. In addition, the module shows a simplified and low cost design approach based on PolyMEMS INAOE® technology, featured by low-temperature processing.

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Capineri, Lorenzo. "Design and realization of a tactile switches module with capacitive sensing method implemented with a microcontroller." Transactions on Environment and Electrical Engineering 1, no. 3 (August 26, 2016): 7. http://dx.doi.org/10.22149/teee.v1i3.21.

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The aim of this research project is the architecture and the design of an electronic system for controlling domestic tactile switches to be integrated into a home automation system based on the KNX standard. All the steps that led to the fulfillment of the finished prototype are reported, from the study and design of the capacitive tactile sensors and the electronic control board according to the specifications imposed by KNX standard. The touch event detection is reached as a trade-off with the footprint requirements of the switch. Experimental results of the fabricated prototype are presented to demonstrate the feasibility of this device

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Worfolk, Brian J., Sean C. Andrews, Steve Park, Julia Reinspach, Nan Liu, Michael F. Toney, Stefan C. B. Mannsfeld, and Zhenan Bao. "Ultrahigh electrical conductivity in solution-sheared polymeric transparent films." Proceedings of the National Academy of Sciences 112, no. 46 (October 29, 2015): 14138–43. http://dx.doi.org/10.1073/pnas.1509958112.

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With consumer electronics transitioning toward flexible products, there is a growing need for high-performance, mechanically robust, and inexpensive transparent conductors (TCs) for optoelectronic device integration. Herein, we report the scalable fabrication of highly conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films via solution shearing. Specific control over deposition conditions allows for tunable phase separation and preferential PEDOT backbone alignment, resulting in record-high electrical conductivities of 4,600 ± 100 S/cm while maintaining high optical transparency. High-performance solution-sheared TC PEDOT:PSS films were used as patterned electrodes in capacitive touch sensors and organic photovoltaics to demonstrate practical viability in optoelectronic applications.

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Lee, Chang-Ju, Jong Kang Park, Seonki Kim, and Jung-Hoon Chun. "A Study on a Lattice Resistance Mesh Model of Display Cathode Electrodes for Capacitive Touch Screen Panel Sensors." Procedia Engineering 168 (2016): 884–87. http://dx.doi.org/10.1016/j.proeng.2016.11.297.

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Wang, Xiaolong, Tingjie Li, Jillian Adams, and Jun Yang. "Transparent, stretchable, carbon-nanotube-inlaid conductors enabled by standard replication technology for capacitive pressure, strain and touch sensors." Journal of Materials Chemistry A 1, no. 11 (2013): 3580. http://dx.doi.org/10.1039/c3ta00079f.

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Qin, Hantang, Jingyan Dong, and Yuan-Shin Lee. "Fabrication and electrical characterization of multi-layer capacitive touch sensors on flexible substrates by additive e-jet printing." Journal of Manufacturing Processes 28 (August 2017): 479–85. http://dx.doi.org/10.1016/j.jmapro.2017.04.015.

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Hsu, Jui Me, Po Ching Ho, Chia Chiang Chang, and Ta Hsin Chou. "Ga-Doped ZnO Films Deposited by Atmospheric Pressure Plasma." Advanced Materials Research 939 (May 2014): 465–72. http://dx.doi.org/10.4028/www.scientific.net/amr.939.465.

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Deposition of gallium-doped zinc oxide (GZO) thin films using atmospheric pressure plasma jet (APPJ) system is presented in this work. High quality GZO films were demonstrated: The resistivity of as-deposited film achieves up to ~7×10-4ohm-cm, which is comparable to that deposited using vacuum process. Further, the optical transmission with optimized thickness is > 89 % at wavelength of 550 nm. The Hall mobility increased as GZO deposition thickness increase to 300 nm. In order to study thermal stability of GZO thin films, the effect of thermal annealing on the optical and electrical properties was studied. Samples annealed in vacuum and in air showed opposite characteristics: resistivity decrease for vacuum annealing samples and increase for air annealing samples. Carrier reduction mainly attributed to the resistivity increase in air annealing. Mobility increases but carrier concentration decreases when samples were annealed in vacuum: The combined effects resulted in resistivity decrease to half of the prior-annealing values after 500 °C vacuum annealing. The GZO thin films used in capacitive touch sensors were also evaluated. We demonstrated that APPJ-deposited GZO thin films can be successfully applied to touch sensors in our work. These results indicate that our APPJ system can deposit good quality TCO films, which have potential to be applied in optoelectronics field.

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