Array substrate, preparation method thereof, and display device

Abstract

The invention discloses an array substrate, a preparation method thereof, and a display device comprising the array substrate. A first through hole through which part of a first electrode is exposed is arranged in a pixel switch; a first protective layer is arranged in the first through hole; a pixel electrode is electrically connected with the first electrode through the first protective layer; the protective layer and a first signal line are of the same metal layer; the first signal line provides an electric signal to a common electrode. Through the structural design, the drain metal in the first through hole can be effectively prevented from over-etching, so that the pixel electrode on the upper layer of a drain is prevented from being broken; therefore, the display effect of the display device is improved; moreover, the preparation method of forming the first signal line and the first protective layer on a third insulating layer in which the first through hole and a second through hole are formed is adopted, wherein the first protective layer is formed in the first through hole; in addition, the preparation method is easy to operate.

Description

Technical field [0001] The present invention relates to flat panel display technology, in particular to an array substrate and a preparation method thereof, and a display device including the array substrate. Background technique [0002] Display panels are currently widely used in mobile phones, handheld computers (Personal Digital Assistant, PDA) and other portable electronic products, such as: Thin Film Transistor-Liquid Crystal Display (TFT-LCD), organic light-emitting diodes Displays (Organic Light Emitting Diode, OLED), Low Temperature Poly-silicon (LTPS) displays, and Plasma Display Panels (PDP), etc. Driven by market competition, display devices that are lighter, have better display effects, and have lower prices are increasingly sought after. [0003] In recent years, thin display devices have been increasingly sought after by consumers. There are currently many methods to prepare thin display devices. Among them, the method of fabricating touch electrodes in liquid cryst...

AI Technical Summary

Problems solved by technology

[0003] In recent years, thin display devices have become more and more sought after by consumers. There are many ways to prepare thin display devices, among which the method of making touch electrodes in liquid crystal cells is particularly common. Usually, touch electrodes are made in On the TFT substrate of the display device, it is necessary to make a shielding electrode on the TFT substrate, and when the shielding electrode is etched, the coated shielding electrode in the contact hole electrically connected to the pixel electrode and the drain of the thin film transistor Over-etching, during the etching process, the drain metal in the contact hole will be over-etched, forming an inverted cone (Taper) structure, resulting in disconnection of the pixel electrode on the upper drain, thus affecting the display effect of the display device

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