Capacitive tactile sensor array for touch screen application

Kim, Hongki; Lee, Seunggun; Yun, Kwang-Seok

doi:10.1016/j.sna.2009.12.031

Cited by 203 publications

(107 citation statements)

References 10 publications

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“…Until now, the low cost resistive type touch panels have been widely used, however the capacitive type touch panels are becoming the main stream [1]. In order to incorporate the multitouch feature even with large-sized display panels, touch sensors with small area, low power, improved accuracy, and fast detection time are highly demanding.…”

Section: Introductionmentioning

confidence: 99%

Touch sensor readout circuit with comparator threshold self-adjustment

Asgari

Lee

2018

IEICE Electron. Express

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This work describes a capacitive type touch sensor readout circuit using a current based capacitance-to-time converter with comparator threshold level self-adjustment. The proposed circuit generates an output pulse with duty-cycle corresponding to the panel capacitance variation using a simple switch control block, a current generator, and a comparator. This does not require additional amplifiers and passive capacitors/resistors. As a result, the proposed scheme can lead to small size and low power on-chip solution with fast detection time compared to conventional touch sensor readout circuits. Furthermore, due to the comparator threshold level selfadjustment, the readout circuit is less sensitive to component mismatch and process variations. The readout circuit is implemented using CMOS 0.35 µm technology with core area of 100 µm × 27 µm and power consumption of 52 µW, which can detect the touch panel capacitance ranging from 5 pF to 50 pF.

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Section: Introductionmentioning

confidence: 99%

Touch sensor readout circuit with comparator threshold self-adjustment

Asgari

Lee

2018

IEICE Electron. Express

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“…Resistive touch sensor, exploits pressure to complete separated electronic circuits; optical ones are made by a network of photo-detectors sensitive to the daylight intensity [3]; ultrasonic sensors use piezo-electric actuators for interfacing with electronics, acoustic wave is injected and when a touch occurs a part of this signal is absorbed [4,5]. Among those techniques, capacitive sensing [6][7][8] remains the most popular. It is based on a very straightforward coupling between electrostatics and electronics, with very simple and low-cost transducers: electrode arrays directly made on thin films.…”

Section: Introductionmentioning

confidence: 99%

Development of a Compact Acquisition System for Touch Location on a Conformable Monoport Distributed Sensor

Selmene¹,

Blayac²,

Muller³

et al. 2017

JEE

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A compact acquisition system developed for a flexible large area monoport tactile surface is presented in this paper. This sensor requires a single port connection and avoids complicated matrix acquisition system and multiplexing. The tactile surface is based on a coplanar transmission line printed on a large area flexible substrate. Touching the waveguide generates a reflected signal. A harmonic analysis of this reflected signal at the line input port allows locating the touch event. A compact and low complexity acquisition system has been developed in order to demonstrate the principle and evaluate the feasibility of its integration on the sensor. Theoretical background, design and measurements on the overall sensor are exposed. The acquisition circuit imperfections have been demonstrated experimentally and correction methods have been proposed and implemented. Results are presented, and to assess the precision of the compact acquisition system, they are compared to reference measurements made with a Vector Network Analyzer.

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“…Various kinds of TSP modules using different principles of operation have been developed. Among them, methods sensing the change in resistance or capacitance are commonly used these days [1][2][3]. In spite of the growth in TSP-embedded products, the TSP market has become very crowded these days; hence the inspection and repair of defective TSP electrodes is essential for cost reduction.…”

Section: Introductionmentioning

confidence: 99%

Operating Voltage of Optical Instruments based on Polymer-dispersed Liquid Crystal for Inspecting Transparent Electrodes

Yeo

Lee

2017

Current Optics and Photonics

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Optical instruments based on polymer-dispersed liquid crystal (PDLC) have been used to inspect transparent electrodes. Generally the operating voltage of an inspection instrument using PDLC is very high, over 300 V, reducing its lifetime and reliability. The operating-voltage issue becomes more serious in the inspection of touch-screen panel (TSP) electrodes, due to the bezel structure protruding over the electrodes. We have theoretically calculated the parameters affecting the operating voltage as a function of the distance between the TSP and the PDLC, the thickness, and the dielectric constant of the sublayers when the inspection module was away from the TSP electrodes. We have experimentally verified the results, and have proposed a way to reduce the operating voltage by substituting a plastic substrate film with a hard coating layer of smaller thickness and higher dielectric constant.

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Capacitive tactile sensor array for touch screen application

Cited by 203 publications

References 10 publications

Touch sensor readout circuit with comparator threshold self-adjustment

Touch sensor readout circuit with comparator threshold self-adjustment

Development of a Compact Acquisition System for Touch Location on a Conformable Monoport Distributed Sensor

Operating Voltage of Optical Instruments based on Polymer-dispersed Liquid Crystal for Inspecting Transparent Electrodes

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