Array substrate and preparation method and display device of array substrate

Abstract

The invention provides an array substrate and a preparation method and display device of the array substrate, which are used for reducing the voltage difference of common electrode layers among different pixel units, and increasing the pixel aperture ratio. The array substrate comprises a substrate, grid lines arranged on the substrate in an intersecting way, data lines, and pixel units which are formed by the division of the grid lines and the data lines and are in matrix arrangement, wherein thin film transistors, pixel electrodes and common electrode layers are arranged in the pixel units, and the thin film transistors comprise grid electrodes, first insulating layers, source electrodes, drain electrodes and active layers. The array substrate also comprises black matrixes with conductivity, which are arranged in non-display areas of the pixel units and electrically connected with the common electrode layers, and second insulating layers which are used for insulating the black matrixes and the common electrode layers from the thin film transistors, wherein the coverage areas of the second insulating layers are overlapped with the coverage areas of the black matrixes and the common electrode layers.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to an array substrate, a preparation method thereof, and a display device. Background technique [0002] Thin Film Transistor Liquid Crystal Display (TFT-LCD) has the characteristics of small size, low power consumption, and no radiation. It has developed rapidly in recent years and occupies a dominant position in the current flat panel display market. TFT-LCD has been widely used in various large, medium and small size products, almost covering the main electronic products in today's information society, such as LCD TV, high-definition digital TV, computer, mobile phone, vehicle display, projection display, video camera , digital cameras, electronic watches, calculators, electronic instruments, meters, public displays and virtual displays, etc. [0003] TFT-LCD is composed of liquid crystal display panel, driving circuit and backlight module, and liquid crystal disp...

AI Technical Summary

Problems solved by technology

[0008] In the prior art, since the metal layer 11 and the gate 10 are arranged on the same layer and are made of the same material, the materials used are generally Cr, W, Ti, Ta, Mo, Al, Cu and other metals and their alloys, so that the metal After the layer 11 is connected in parallel with the common electrode layer 20, the resistance of the common electrode layer 20 can be reduced to a certain extent, but due to the restriction of the width d1 of the black matrix 80 on the color filter substrate, and in order to prevent the A short circuit occurs, and the distance between the metal layer 11 and the gate 10 is about 5 micrometers (um), so the width d2 of the metal layer 11 is very limited, so the effect on reducing the resistance of the common electrode layer 20 is not very obvious, However, reducing the resistance of the common electrode layer 20 by increasing the length of d2 will cause d2 to enter the interior of BB'-CC', resulting in a decrease in the pixel aperture ratio

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