Color filter substrate, preparation method thereof, and quantum dot display device comprising it

Abstract

A color filter substrate is provided, comprising: a base substrate; a black matrix formed on the base substrate, comprising a plurality of openings and banks surrounding each opening and defining a plurality of pixel regions, the banks comprising Black dye; a color filter layer, formed in each opening, including a colored quantum dot material layer formed in at least part of the opening area; a first planarization layer, covering the color filter layer, and the embankment is exposed the first planarization layer; a second planarization layer covering the first planarization layer and the bank, the surface of the second planarization layer corresponding to the first planarization layer The distance between the surface of the bank part and the base substrate is smaller than the distance between the surface of the part corresponding to the pixel area and the base substrate; a grating layer is formed on the second planarization layer; Three planarization layers covering the grating layer. The present invention forms a flattening layer with a high pixel area and a low black bank area, so that the nanometer grating in the pixel area can be well formed.

Description

Technical field [0001] The present invention relates to the technical field of quantum dot display, and in particular to a color film substrate, a preparation method thereof, and a quantum dot display device containing it. Background technique [0002] With the rapid development of the display field, quantum dot display technology has received more and more attention due to its unique light-emitting properties, excellent stability, wider color gamut coverage, and relatively low cost. At present, in display devices using quantum dot display technology, the blue light emitted by the backlight is usually used to excite the quantum dot material to emit red and green light, thereby providing a color display. [0003] In the existing process of preparing quantum dot display devices, it is necessary to planarize the base substrate when the green light quantum dot material (QD G) and the red light quantum dot material (QD R) are completed. However, due to the flat material and the black ba...

AI Technical Summary

Problems solved by technology

[0003] In the existing process of preparing quantum dot display devices, it is necessary to planarize the substrate substrate after completing the green light quantum dot material (QD G) and the red light quantum dot material (QD R), but due to the flat material and the black bank (bank) and There is a large gap between the color resists, and the level difference cannot be completely erased after planarization. This structure with a low pixel area and high sides is not conducive to the formation of gratings by nanoimprinting.

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