Touch display device and manufacturing method thereof

Abstract

The invention discloses a touch display device and a manufacturing method thereof. The touch display device includes a touch screen base plate and a pixel array base plate, and further includes a first shielding layer and a second shielding layer. The touch screen base plate includes a touch control structure layer and output leads of the touch control structure layer (including drive electrode leads and induction electrode leads); the pixel array base plate is provided with a pixel array and peripheral leads of the pixel array; the output leads of the touch control structure layer and the peripheral leads of the pixel array are overlapped in the light transmitting direction; the first shielding layer is arranged between the drive electrode leads and the peripheral leads of the pixel array; and the second shielding layer is arranged between the induction electrode leads and the peripheral leads of the pixel array. The shielding layers reduce the parasitic capacitance between the peripheral leads of the pixel array base plate and the output leads of the touch control screen base plate, avoid the condition that drive electrodes and induction electrodes of the touch screen are coupled through the parasitic capacitance, and further improve the SNR (Signal to Noise Ratio).

Description

technical field [0001] The present invention relates to the field of touch display, in particular to an embedded touch display device and a manufacturing method thereof. Background technique [0002] As an input medium, a touch display device is currently the simplest, most convenient and natural way of human-computer interaction. Therefore, touch display devices are more and more applied to various electronic products, such as mobile phones, notebook computers, MP3 / MP4 and so on. [0003] The touch display device is equipped with a touch screen to realize the touch display function, and based on different working principles and information transmission media, the touch screen can be divided into four types: resistive, capacitive, infrared, and surface acoustic wave. The capacitive touch screen has become the current mainstream touch screen technology due to its advantages of long life, high light transmittance, and support for multi-touch. In order to make the touch displ...

AI Technical Summary

Problems solved by technology

Because the signal corresponding to the mutual capacitance change is usually small, it is easy to be submerged in the larger substrate signal, making it difficult for the detection circuit 6 to detect the signal corresponding to the mutual capacitance change, resulting in detection failure

[0014] It can be seen from the above that the touch display device in the prior art includes a pixel array substrate (such as an LCD pixel array substrate, an OLED pixel array substrate) and a touch screen substrate oppositely arranged, wherein the output leads (including drive electrode leads and sensing electrode leads) of the touch screen substrate are connected to The peripheral leads of the pixel array substrate (including scan line leads and common electrode leads) generate a large parasitic capacitance at the overlap of the peripheral lead area, and the driving electrodes and sensing electrodes of the touch screen are coupled through the parasitic capacitances 13a and 13b to generate interference signals , making it difficult for the detection circuit to detect the signal corresponding to the mutual capacitance change, and even cause detection failure

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