An embedded touch screen, its touch detection method and display device

Abstract

An in-cell touch screen, a touch detection method thereof and a display device are disclosed, the in-cell touch screen comprising: an array substrate and an opposed substrate arranged opposite to each other; a self-capacitance electrode pattern (100, 200), disposed on a side of the array substrate facing the opposed substrate and / or a side of the opposed substrate facing the array substrate, including: a plurality of first self-capacitance electrodes (100), each of the first self-capacitance electrodes (100) being a strip electrode, a plurality of second self-capacitance electrodes (200), each of the second self-capacitance electrodes including a plurality of block electrodes (210) electrically connected with each other; and a touch detecting chip, configured to judge a touch position according to signal variation of the self-capacitance electrode pattern, wherein orthogonal projections of each of the first self-capacitance electrodes (100) and each of the second self-capacitance electrodes (200) on the array substrate cross to each other, and each of the first self-capacitance electrodes (100) and each of the second self-capacitance electrodes (200) are connected with the touch detecting chip through periphery wirings (300), respectively. The in-cell touch screen according to an embodiment of the present disclosure varies the self-capacitance electrode pattern, which can significantly reduce the number of the periphery wirings, and is conducive to narrow frame design; moreover, time required for touch detection can be greatly reduced in a mode of switching self capacitance and mutual capacitance.

Description

technical field [0001] The invention relates to the field of touch technology, in particular to an embedded touch screen, a touch detection method and a display device thereof. Background technique [0002] At present, the existing in-cell touch screen uses the principle of mutual capacitance or self-capacitance to detect the finger touch position. Among them, the principle of self-capacitance can be used to set a plurality of self-capacitance electrodes on the same layer and insulated from each other in the touch screen. When the human body does not touch the screen, the capacitance of each capacitive electrode is a fixed value. , the capacitance borne by the corresponding self-capacitance electrodes is a fixed value superimposed on the human body capacitance, and the touch detection chip can determine the touch position by detecting the capacitance value changes of the respective capacitance electrodes during the touch period. Since human body capacitance can act on all s...

AI Technical Summary

Problems solved by technology

In order to simplify the number of layers in the design, the wires in the lead-out line and the self-capacitance electrodes are generally arranged on the same layer. More wires will cause a large touch blind area. The touch blind area refers to the concentration of wires in the touch screen. In this area, the signal in this touch blind area is relatively disordered, so it is called a touch blind area, that is, the touch performance in this area cannot be guaranteed.

figure 1 30 self-capacitance electrodes are used as an example for illustration. 30 self-capacitance electrodes need 30 wires to lead them to the frame. A total of 10 wires are needed in the place where the wires are densest, which will cause a large touch blind area.

[0005] In addition, due to the large number of wires, there will also be too many peripheral wires arranged at the frame and connected to the wires one by one, which will cause the frame of the touch screen to expand, which is not conducive to the narrow frame design.

Images