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Touch control screen

A technology of touch screen and touch circuit, which is applied in the direction of instruments, electrical digital data processing, input/output process of data processing, etc., and can solve problems such as complex structure

Active Publication Date: 2014-05-07
FOCALTECH ELECTRONICS SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is necessary to find a solution to the above-mentioned complex structural problems, improve the reliability of the capacitive touch screen, improve the display effect, compress the thickness, reduce the cost, and realize the touch function of the flat panel display in a simple way

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0077] Figure 4 For the touch display 400 shown, the timing of the display electrode time division multiplexing scheme is as follows Figure 5 shown. The frame blanking period between every two display frames is used as the touch detection period. During this period, the display electrode is switched to the touch sensing electrode, and the touch excitation signal is applied to the display electrode to detect the display. The change of the touch signal on the electrode.

[0078] The touch excitation source is a square wave signal source with or without a DC bottom value. During touch detection, for example figure 2 The three electrodes of Gi, Sj and COM of the TFT shown are respectively applied as Image 6 As shown in the touch excitation signal, the three applied touch excitation signals are all square waves with or without a DC bottom value, and have the same frequency and phase. When the display screen electrode is switched from the display state to the touch detectio...

specific Embodiment approach 2

[0080] The difference between this embodiment and Embodiment 1 is that the three touch excitation signals applied (such as Figure 7 shown) are not the same frequency.

specific Embodiment approach 3

[0081] The difference between this embodiment and Embodiment 1 and Embodiment 2 is that the three touch excitation signals applied are all square waves with or without a DC bottom value, and their frequencies are the same but their phases are inconsistent, such as Figure 8 shown.

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Abstract

A touch screen is provided, which includes a substrate and a touch control circuit. Two or more groups of intersected row electrode groups and column electrode groups are disposed on the substrate. The touch control circuit has a touch excitation source and a touch signal detection circuit. The touch signal detection circuit has a signal detection channel, a data sampling channel, and a data processing and timing control circuit. The touch control circuit applies a touch signal to an electrode line in the row electrode groups or column electrode groups, and detects a change of the touch signal on the electrode line, so as to detect whether the electrode is touched or not. Each signal detection channel or data sampling channel of the touch control circuit performs signal detection sequence or data sampling sequence on each electrode line in the row electrode groups and column electrode groups in a scanning mode, and performs signal detection or data sampling on the touch signal on different electrode lines in different times.

Description

technical field [0001] The invention relates to a touch screen and a touch display screen, in particular to a capacitive touch screen and a touch display screen. Background technique [0002] Touch screens have been widely used in many fields such as personal computers, smart phones, public information, smart home appliances, and industrial control. In the current touch field, there are mainly resistive touch screens, photoelectric touch screens, ultrasonic touch screens, and planar capacitive touch screens. In recent years, projected capacitive touch screens have developed rapidly. But at present these touch screens all have respective technical shortcomings, although they have been widely used in some special occasions, it is difficult to popularize and apply them on ordinary display screens. [0003] The display screen and the touch screen are twin products. In the prior art, the display screen and the touch screen usually undertake display and touch tasks independently....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/041
CPCG06F3/044G06F3/0412G06F3/0416G06F3/04166G06F3/041661
Inventor 陈其良刘海平李德海
Owner FOCALTECH ELECTRONICS SHENZHEN CO LTD