A kind of coa substrate and its preparation method, display device

Abstract

Embodiments of the present invention provide a COA substrate, a preparation method thereof, and a display device, which relate to the field of display technology, and can ensure contact between a connection pattern and a signal line lead without increasing production costs. The disclosed COA substrate includes a first conductive layer, an insulating layer, a second conductive layer, a flat layer, and a connection pattern arranged in sequence; the first conductive layer includes signal wire leads located in the wiring area; the part of the insulating layer located in the wiring area has a second A via hole to expose the signal line leads; the second conductive layer includes a first metal pattern located in the wiring area and a second metal pattern located in the display area, the first metal pattern has a second via hole; the flat layer is located in the part of the wiring area There is a hollowed out area, the second via hole is at least partially located in the hollowed out area, and the projection of the boundary of the second via hole located in the hollowed out area on the base substrate overlaps with the projection of the boundary of the first via hole on the base substrate; The pattern is located in the wiring area, and the connection pattern passes through the first via hole and the second via hole to be connected with the signal line leads.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a COA substrate, a preparation method thereof, and a display device. Background technique [0002] COA (Color Filter on Array) substrate means that the color film layer is directly prepared on the array substrate. Since the display panel using the COA substrate does not have the problem of alignment between the color filter substrate and the array substrate, it can reduce the difficulty of box alignment during the production process of the display panel and avoid errors in box alignment. Therefore, the black matrix can be designed to be narrower. Thereby improving the pixel aperture ratio. [0003] However, since the color film layer is prepared on the array substrate, it will cause a large gap on the surface of the array substrate, which may affect the preparation of the subsequent process. In the prior art, by adding a flat layer, the flat layer can be, for example, an organi...

AI Technical Summary

Problems solved by technology

However, although the connection pattern 40 can be fully contacted with the signal line lead 10 in this way, since the insulating layer 20 is not patterned in the prior art, if the via hole 201 is to be formed at the part of the insulating layer 20 located in the wiring area, an additional Adds a second mask, which leads to an increase in cost

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