Colored film baseplate, preparation method thereof and display device

Abstract

An embodiment of the invention provides a colored film baseplate, a preparation method thereof and a display device and relates to the technical field of display. By the preparation method, the colored film baseplate having high flatness can be obtained without increasing composition process number, and image display quality of a liquid crystal display device after involution is guaranteed. The preparation method includes: forming a first color resistor, a second color resistor and a third color resistor positioned in a first sub pixel area, a second sub pixel area and a third sub pixel area respectively on a substrate baseplate, wherein the first color resistor, the second color resistor and the third color resistor have first thickness; forming a protection layer covering above the substrate baseplate; forming a transparent insulating layer covering the protection layer, wherein thickness of the transparent insulating layer is greater than the first thickness; performing composition process processing on the transparent insulating layer, and forming a spacer and a spacer material reserving portion on the protection layer, wherein the spacer material reserving portion is positioned in a fourth sub pixel area, and thickness of the spacer material reserving portion is equal to the first thickness.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a color filter substrate, a preparation method thereof, and a display device. Background technique [0002] RGBW (Red, red; Green, green; Blue, blue; White, white) four-color liquid crystal display device is based on RGB three-color liquid crystal display device, adding a W pixel made of transparent material to improve backlight and The transmittance of the LCD panel. Since the RGBW four-color liquid crystal display device has higher light transmittance and higher brightness, the demand for backlight brightness can be reduced, and the cost of the liquid crystal display device can be further reduced, so the market demand is increasing. [0003] The RGBW four-color liquid crystal display device specifically includes two substrates that are aligned up and down. The upper substrate may be, for example, a color filter substrate, and the lower substrate may be, for example, an array ...

AI Technical Summary

Problems solved by technology

Among them, such as figure 1 As shown, the PW process is to separately coat a layer of PS material after completing BM (Black Matrix) and RGB color resistance, and form a W color resistance through a patterning process. The thickness of PS material and RGB color resistance is equal. The height of the formed W color resistance is equal to the height of the RGB color resistance, and the color filter substrate has better flatness, but this process requires an additional patterning process, which increases the preparation time of the color filter substrate, which is not conducive to mass production manufacture

like figure 2 As shown, the CW process is to directly coat the OC layer on the color film substrate after the BM and RGB color resists are completed, without the composition process of exposure and development. The preparation time of the color film substrate is the same as that of the existing three-color RGB color film substrate. The time is equivalent, which is conducive to mass production and manufacturing; but since the OC layer is directly covered on the BM and RGB color resistance, in the area defined by BM corresponding to the W color resistance, there is no color resistance material under the OC layer, which is directly sunken. Therefore, the total height of the film layer at the W color resist made by the CW process will be significantly lower than the film height at the RGB color resist, that is, the W color resist is in a concave state, resulting in a lower overall flatness of the color filter substrate. Difference

like image 3 As shown, when rubbing and aligning the PI solution (orientation layer solution, usually referred to as PI because it is usually made of polyimide material) coated on the surface of the color filter substrate by a rubbing roller, it is easy to generate an alignment weak zone Or the introduction of impurity particles will affect the display quality of the picture; at the same time, due to the poor overall flatness of the color filter substrate prepared by the CW process, the measurement accuracy of the cell thickness of the liquid crystal panel formed after the color filter substrate is combined with the array substrate and the accuracy of the cell thickness of the set at The height calculation results of the spacer (referred to as PS in the figure) between the two substrates will be affected

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