Method for manufacturing color filter with pixel end difference height improved through half tone mask

Abstract

The invention discloses a method for manufacturing a color filter with the pixel end difference height improved through a half tone mask. The method comprises the steps that firstly, a substrate is coated with a black matrix material; secondly, exposing, developing and high-temperature baking and solidifying are carried out on the material through the half tone mask, four areas are formed, T-shaped black matrix patterns with the height difference are formed in the first area, the second area and the third area and are reserved on the substrate; thirdly, the four areas of the substrate are coated with color films; fourthly, exposing, developing and solidifying are carried out on the color films so that a needed color film pattern can be formed, wherein the needed color film pattern is located on the first area, the third area and the fourth area, and the operation is repeatedly carried out three times; fifthly, a transparent conductive layer ITO is splashed after all color film layers are formed; sixthly, the substrate is coated with a transparent insulation material layer; seventhly, the substrate is wholly exposed, developed and solidified, and a PS layer with the needed height is formed and serves as a common column for supporting Gaps between two LCD substrate layers. The method has the advantages that the material does not need to be changed, the production efficiency is improved, and the production procedures are simplified.

Description

technical field [0001] The invention relates to a method for manufacturing a color filter by using a half tone mask (Half Tone Mask) to improve the height of pixel end difference (horn) and belongs to the technical field of display filter production. Background technique [0002] The structure of the color filter (Colour Filter) includes a glass substrate, a black matrix, a color layer, an ITO conductive film layer, and a PS layer. In order to prevent light leakage between the color pixel and the underlying black matrix BM, there is an appropriate amount of overlap between the color pixel and the black matrix BM during design, that is, Overlay, where the photoresist amount is more than other parts of the pixel, and the height is also higher than other parts of the pixel , usually called end difference (ox horn), such as figure 1 As shown, TN products have very high requirements for the end difference (horn) on the pixel. If the end difference (horn) is high, it will affect ...

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a color filter manufacturing method that uses a half-tone mask to improve the edge height of pixels. Its purpose is to solve the PI friction caused by too high end difference by controlling the end difference height within a reasonable range. Unevenness leads to poor liquid crystal alignment and light leakage at the edge of the pixel

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