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Touch device and driving method thereof

A touch device and drive unit technology, applied in the direction of instruments, calculations, electrical digital data processing, etc., can solve the problem of enlarged touch electrode impedance across the screen, weakened touch drive and detection signals, and uneven film thickness of touch electrodes and other issues to achieve the effect of improving touch performance

Active Publication Date: 2014-07-23
SHANGHAI AVIC OPTOELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing mutual-capacitance touch screen, when the touch electrode in the touch panel has poor film quality (the so-called poor film quality refers to the insufficient etching liquid, film forming power, annealing temperature, etc. The overall film thickness of the touch electrode is not uniform due to stable factors), and the impedance of the touch electrode will change due to changes in the contact environment, such as high temperature, high humidity, polarizer containing acid or conductivity, and use time, etc. The impedance of the touch electrode becomes larger on the whole screen
Once the impedance of the touch electrode becomes larger, the touch driving and detection signals received by the touch device will be weakened, and then the touch performance of the touch device will decrease or fail.

Method used

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  • Touch device and driving method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] figure 2 Shown is a touch device 20 provided by an embodiment of the present invention. The touch device 20 includes: a touch panel 21 , a detection unit 22 , a drive unit 23 and a comparison unit 24 .

[0030] The touch panel 21 includes: a plurality of sensing lines, the plurality of sensing lines are composed of a plurality of scanning electrodes 25 and a plurality of sensing electrodes 26 . The scanning electrodes 25 and the sensing electrodes 26 are connected to the driving unit 23 through the scanning electrode leads 27 and the sensing electrode leads 28 respectively.

[0031] The detection unit includes at least one detection line 22, the detection line 22 is a straight line, one end is connected to the drive unit 23, and the other end is connected to the ground wire, and the detection line 22 is connected to the scanning electrodes 25 (or sensing electrodes) in the touch panel 21. The electrodes 26 ) are placed in parallel, and the detection line 22 is located...

Embodiment 2

[0040] image 3 Another touch device 30 provided by the embodiment of the present invention, the difference between the structure of the touch device 30 and the touch device 20 in the first embodiment is that the comparison unit 34 is located in the drive unit 33 Externally, one end of the comparison unit is connected to the detection line 32 to receive the first feedback signal output from the detection line 32 , and the other end is connected to the driving unit 33 to output a second feedback signal to the driving unit. The comparison unit 34 is a voltage comparator, and a first predetermined value is set inside the voltage comparator.

[0041] When the touch device works normally, the driving unit 33 provides a first driving signal to the scanning electrodes 35 and the sensing electrodes 36, and the first driving signal is an AC signal. The first driving signal is transmitted to the scanning electrodes 35 and the sensing electrodes 36 via the scanning electrode leads 37 an...

Embodiment 3

[0046] Figure 6 It is a flow chart of an embodiment of the present invention based on the driving method of the touch device 20 proposed in the first embodiment.

[0047] Such as Figure 6 As shown, firstly, the driving unit 23 provides the first driving signal to the touch panel 21 and provides the second driving signal to the detection unit.

[0048] When the touch device 20 works normally, the driving unit 23 provides a first driving signal to the scanning electrodes 25 and the sensing electrodes 26 in the touch panel 21 , and the first driving signal is an AC signal. The first driving signal is transmitted to the scanning electrodes 25 and the sensing electrodes 26 through the scanning electrode leads 27 and the sensing electrode leads 28 . After the scanning electrodes 25 and the sensing electrodes 26 receive the first driving signal, the scanning electrodes 25 are driven and scanned line by line, and the sensing electrodes 26 are sensed and compared line by line, usin...

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Abstract

The invention discloses a touch device and a driving method of the touch device. The touch device comprises a touch panel, a detection unit, a driving unit and a comparison unit, wherein the detection unit comprises at least one detection line and is used for detecting the impedance change of the touch panel and outputting a corresponding first feedback signal, the driving unit is connected with the touch panel and the detection unit and provides a first driving signal and a second driving signal to the touch panel and the detection unit respectively, a first preset value is set inside the comparison unit, the comparison unit receives the first feedback signal output by the detection unit and compares the first feedback signal with the first preset value, and the driving unit adjusts the first driving signal according to a comparison result. According to the touch device, the impedance change of the sensing line in the touch panel can be detected in real time, the driving capacity of the touch device is adjusted in real time according to the resistance change, and thus the purpose of improving the touch performance is achieved.

Description

technical field [0001] The present invention relates to the field of touch control, in particular to a touch control device and a driving method of the touch control device. Background technique [0002] As an input medium, the touch display screen is currently the simplest and most convenient way of human-computer interaction, so the touch display screen is more and more applied to various electronic products. Based on different working principles and information transmission media, touch screen products can be divided into four types: infrared touch screen, capacitive touch screen, resistive touch screen and surface acoustic wave touch screen; among them, capacitive touch screen has long life, high light transmittance, and can support multiple Point touch and other advantages have become the current mainstream touch screen technology. [0003] Capacitive touch screens include surface capacitive and projected capacitive, and projected capacitive can be further divided into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 黄正园叶松王香春丁晓源李文静杨旭向倩影马海涛
Owner SHANGHAI AVIC OPTOELECTRONICS