Touch display panel and preparation method thereof as well as display device

Abstract

The invention provides a touch display panel and a preparation method thereof as well as a display device, belonging to the field of a touch screen display. The touch display panel comprises an array substrate and the array substrate is provided with a plurality of grid wires and a plurality of public electrode wires; the touch display panel further comprises a plurality of optical sensing units arranged on the array substrate, an optical sensing control wire arranged on the array substrate, an optical sensing signal wire arranged on the array substrate and a voltage supply unit, wherein each optical sensing unit comprises an optical sensing TFT (Thin Film Transistor); a grid electrode and a drain electrode of the optical sensing TFT are connected with the optical sensing control wire; the optical sensing signal wire is crossly arranged with the optical sensing control wire; one end of the optical sensing signal wire is connected with the optical sensing units and is used for outputting an optical sensing signal; and the voltage supply unit is used for providing stable voltage to the optical sensing TFT through the optical sensing control wire. The technical scheme disclosed by the invention can improve touch precision and accuracy.

Description

technical field [0001] The invention relates to the field of touch screen displays, in particular to a touch display panel, a manufacturing method thereof, and a display device. Background technique [0002] According to the principle, the touch screen generally includes the following types: resistive touch screen, capacitive touch screen, infrared touch screen, surface acoustic wave touch screen, electromagnetic touch screen, vibration induction touch screen, frustrated total internal reflection optical induction, etc. According to the composition structure, the touch screen is divided into: external touch screen (double layer), touch sensor on the coverage surface (single layer), touch sensor on the panel, and touch sensor inside the panel. With the market development trend of overall module thinning, the structure of the touch screen is developed from an external touch screen to an embedded touch screen, which can not only reduce the thickness of the touch panel but also ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, optical touch sensing generally uses an optical sensing thin film transistor (optical sensing TFT) to sense light intensity, and the gate and source of the optical sensing TFT are connected to the common electrode lines on the array substrate , because the voltage of the common electrode is limited by the array substrate, it cannot be adjusted arbitrarily; and the common electrode will be interfered by the data signal line during actual work, resulting in certain noise, so the voltage of the common electrode is not maintained at the actual working process A constant DC voltage, which will have a certain impact on the touch accuracy and judgment accuracy

At the same time, since the optical sensing TFT is connected to the common electrode line, it will affect the stability of the voltage on the common electrode line, which will cause the voltage on the common electrode to be unstable, thereby affecting the display of the pixel.

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