Color filter, manufacturing method thereof, liquid crystal panel and display device

Abstract

The invention provides a manufacturing method of a color filter. The method comprises a step of forming a black matrix and a step of sequentially forming a first color filter layer, a second color filter layer and a third color filter layer, wherein the first color filter layer, the second color filter layer and the third color filter layer are formed in the black matrix respectively through a first color filter layer alignment mark, a second color filter layer alignment mark and a third color filter layer alignment mark; and in the step of forming the first color filter layer, the second color filter layer and the third color filter layer, the third color filter layer alignment mark is formed at the same time or after the first color filter layer is formed, and the first color filter layer alignment mark, the second color filter layer alignment mark and the third color filter layer alignment mark are not exactly same in color. According to manufacturing method of the color filter, the accuracy of alignment identification of exposure equipment in an exposure process in an exposure step is improved, and the occurrence of a phenomenon that the exposure equipment is difficult to acquire the third color filter layer alignment mark can be avoided, so that the production time is greatly saved, and the production cost is reduced.

Description

Technical field [0001] The invention belongs to the technical field of liquid crystal display, and relates to a color filter and a manufacturing method thereof, and a liquid crystal panel and a display device containing the color filter. Background technique [0002] In a liquid crystal display (Liquid Crystal Display, LCD for short), a color filter (Color Filter, CF for short) is one of the important components of a liquid crystal panel to achieve color display. [0003] In the current production process of color filters, the transparent substrate is generally cleaned and a black matrix (BM for short) for shading is made on it, and then the three primary color filter layers of red, green, and blue are made in sequence, and finally made Protective layer and transparent electrode (ITO), etc. In the production of the red, green, and blue primary color filter layers, the process steps of "coating the corresponding color photoresist to form a color filter film→pre-baking→exposure→deve...

AI Technical Summary

Problems solved by technology

[0005] However, in the production process of the color filter layer, for the convenience of the process, the overall coating method is generally used when coating the color filter film, that is, the color filter film is not only coated in the black matrix, but also coated on the black matrix. In other areas other than the black matrix, like this, when the red color filter layer and the green color filter layer are manufactured, the blue color filter layer alignment mark 5 used to make the blue color filter layer on the substrate is not only coated The red photoresist is applied, and the green photoresist is also coated at the same time. Therefore, after coating the blue color filter film (made of blue photoresist), the alignment mark 5 of the blue color filter layer is aligned with the The color contrast of the blue photoresist in the black matrix is ​​relatively low, which makes it difficult for the exposure equipment to automatically recognize the alignment mark 5 of the blue color filter layer during the exposure process for making the blue color filter layer, which often causes the exposure equipment to Alarm, at this time, the operator needs to manually operate the positioning, which not only consumes production time, but also easily leads to a decrease in the yield rate of the color filter or even scrapping due to inaccurate alignment and inaccurate exposure, thereby increasing production costs

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