In cell touch panel and display device

Abstract

The invention discloses an in cell touch panel and a display device. Multiple self-capacitance electrodes which are arranged on the same layer and are independent of one another are arranged in the touch panel according to the self-capacitance principle. A touch detecting chip can judge the touch position by detecting change of the capacitance value of each self-capacitance electrode. Due to the fact that body capacitance acts on all the self-capacitance, compared with the mode that body capacitance only acts on projection capacitance of mutual capacitance, the touch variation caused by touch on the panel by a human body is larger, and the signal to noise ratio of touch can be effectively increased; in this way, the accuracy of touch sensing is improved. In addition, compared with the prior art that two new film layers need to be additionally arranged when the touch function is achieved according to the mutual capacitance principle, the in cell touch panel has the advantages that since an ADS-type pattern of a public electrode layer is changed, the multiple self-capacitance electrodes which are independent of one another and wires enabling the self-capacitance electrodes to be connected with the touch detecting chip are formed, no extra film layer is needed, the production cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of touch technology, in particular to an embedded touch screen and a display device. Background technique [0002] With the rapid development of display technology, touch screen panels (Touch Screen Panels) have gradually spread in people's lives. Currently, touch panels can be classified into: Add on Mode Touch Panel, On Cell Touch Panel, and In Cell Touch Panel according to their composition and structure. Among them, the plug-in touch screen is produced separately from the touch screen and Liquid Crystal Display (LCD), and then bonded together to form a liquid crystal display with touch function. The plug-in touch screen has high production costs and low light transmittance. Low, thick modules and other shortcomings. The embedded touch screen embeds the touch electrodes of the touch screen inside the liquid crystal display, which can reduce the overall thickness of the module and greatly reduce the production cos...

AI Technical Summary

Problems solved by technology

[0005] In the structural design of the above-mentioned capacitive embedded touch screen, the human body capacitance will only couple with the projected capacitance in the mutual capacitance, and the facing capacitance formed by the touch driving electrode and the touch sensing electrode on the opposite side will make the signal of the touch screen Reduced noise ratio affects the accuracy of touch sensing in in-cell touchscreens

Moreover, it is necessary to add two new film layers on the existing TFT array substrate, resulting in the need to add a new process when making the TFT array substrate, which increases the production cost and is not conducive to improving production efficiency

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