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Self-capacitance touch screen and touch display device

A self-capacitance, touch screen technology, applied in the direction of electrical digital data processing, instruments, data processing input/output process, etc., can solve the problems of touch detection interference, touch position coordinate offset, false alarm, etc., to improve accuracy, The effect of solving errors and shielding interference

Inactive Publication Date: 2013-11-20
FOCALTECH ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing single-layer self-capacitive touch screen is heavily pressed, there are problems of coordinate offset of the touch position and false positives.
In addition, when the LCD module is working, it will interfere with the touch detection
These will affect the accuracy of touch detection

Method used

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  • Self-capacitance touch screen and touch display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] image 3 A schematic cross-sectional view of a self-capacitive touch screen according to Embodiment 1 of the present disclosure is shown. Such as image 3 As shown, Embodiment 1 of the present disclosure provides a self-capacitive touch screen, including:

[0030] a plurality of self-capacitive touch-sensing electrodes arranged in a single layer;

[0031] A touch control circuit, configured to drive the plurality of self-capacitive touch sensing electrodes, detect changes in self-capacitance of the plurality of self-capacitive touch-sensing electrodes, and determine a touch position based on the self-capacitance changes;

[0032] an insulating layer covering the surfaces of the plurality of self-capacitive touch-sensing electrodes; and

[0033] An isolated electrode, the isolated electrode covers the surface of the insulating layer, and the isolated electrode is connected to the touch control circuit.

[0034] Such as image 3 As shown, as an example, the plurality...

Embodiment 2

[0037] In the self-capacitive touch screen provided in Embodiment 2 of the present disclosure, the touch control circuit is configured to drive the isolated electrodes with a fixed level.

[0038] Please refer to image 3 , during touch detection, the touch sensing electrodes 31 and 33 charge and discharge the isolation electrodes through Cim and Cin, and Cim and Cin form part of the self-capacitance of the touch sensing electrodes 31 and 33 .

[0039] Figure 4 A schematic cross-sectional view showing deformation of the self-capacitive touch screen according to Embodiment 2 of the present disclosure when it is heavily pressed is shown. When the touch screen is pressed heavily, such as Figure 4 As shown, the cover plate is deformed. Since the cover plate is closely arranged with the touch sensing electrodes 31 and 33 , the insulating layer, and the isolation electrodes, the touch sensing electrodes 31 and 33 , the insulating layer, and the isolation electrodes will be defor...

Embodiment 3

[0043] In the self-capacitive touch screen provided in the third embodiment of the present disclosure, the touch control circuit is configured to drive the isolated electrodes according to the driving signals of the plurality of self-capacitive touch sensing electrodes.

[0044] Specifically, the touch control circuit may be configured to drive the isolated electrodes with a signal that is consistent with the waveform of the driving signal of the currently detected touch sensing electrodes, so that the isolated electrodes have the same waveform as that of the currently detected touch sensing electrodes. . In this way, the isolation electrodes change synchronously with the detected touch sensing electrodes, and the detected touch sensing electrodes will not charge and discharge the isolation electrodes. That is, Cim and Cin are not part of the self-capacitance of the touch-sensing electrodes 31 and 33 . Of course, Cil is not part of the self-capacitance of the touch-sensing el...

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PUM

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Abstract

An embodiment of the invention provides a self-capacitance touch screen which comprises a plurality of self-capacitance touch induction electrodes, a touch control circuit, an insulating layer and an isolation electrode, wherein the self-capacitance touch induction electrodes are arranged into a monolayer, the touch control circuit is used for driving the self-capacitance touch induction electrodes, detecting self-capacitance changes of the self-capacitance touch induction electrodes and determining touch positions according to the self-capacitance changes, the insulating layer covers the surfaces of the self-capacitance touch induction electrodes, and the isolation electrode covers the surface of the insulating layer and is connected with the touch control circuit. According to the scheme, touch detection accuracy can be improved.

Description

technical field [0001] The present invention relates to the field of touch technology, in particular to a self-capacitive touch screen and a touch display device including the self-capacitive touch screen. Background technique [0002] Currently, self-capacitive touch screens are widely used in electronic products such as smart phones and tablet computers. However, when the existing single-layer self-capacitive touch screen is heavily pressed, there are problems of coordinate deviation of the touch position and false alarms. In addition, when the liquid crystal display module works, it will interfere with the touch detection. These will affect the accuracy of touch detection. Contents of the invention [0003] In view of this, embodiments of the present disclosure provide a self-capacitive touch screen and a touch display device including the self-capacitive touch screen, which can improve the accuracy of touch detection. [0004] The self-capacitive touch screen provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
CPCG06F3/0443G06F3/0447G06F2203/04107
Inventor 莫良华刘卫平
Owner FOCALTECH ELECTRONICS
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