Embedded touch screen, and touch detection method and display device of embedded touch screen

Abstract

The invention discloses an embedded touch screen, and a touch detection method and a display device of the embedded touch screen. A self-capacitance electrode pattern is changed, and is changed to be composed of a part of block electrodes and a part of strip electrodes from all block electrodes at present; the block electrodes are connected with one another through a lead to be equivalent to the strip electrodes; and the strip electrodes are connected to a touch sensing chip through periphery routing. Compared with the existing condition that bumped self-capacitance electrodes need to be connected to the touch sensing chip through single routing, the periphery routing quantity can be greatly reduced, and a narrow-border design is achieved. In addition, aiming at the problem of a ghost focus appearing when the self-capacitance electrode pattern is subjected to touch detection, according to the touch detection method disclosed by the invention, primary detection is firstly carried out by using the advantage of short self-capacitance detection time; and when a plurality of touch point positions are detected, the self-capacitance electrode pattern is detected again as mutual capacitance to remove the ghost focus position. The time required for touch detection can be greatly shortened by adopting a self-capacitance and mutual capacitance switching detection mode.

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