Display Substrate Color Filter Overlap for Planarization
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Solution Overview
Problem
Conventional display substrates suffer from poor surface planarization and non-uniform spacer distribution, leading to touch dark non-uniformity and increased manufacturing costs due to recesses in the display panel surface.
Innovation Solution
A display substrate design featuring a base substrate with a black matrix and overlapping color filter layers that cover the black matrix, along with spacers positioned to match the surface level, enhancing surface planarization and reducing recess dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If color filters are spaced apart by the black matrix in conventional display substrates, then the black matrix can be formed as a grid structure, but recesses are created in the protective layer leading to poor surface planarization
Solution Approach 1:
The color filter layer is extended to overlap with the black matrix region, merging the color filter structure with the black matrix support structure. This eliminates the gap between color filters that would otherwise create recesses, thereby improving surface planarization while maintaining the grid-like black matrix structure underneath.
Solution Approach 2:
The color filter layer is extended in the horizontal dimension to overlap with the black matrix region, rather than being strictly confined to pixel regions. This dimensional extension allows the color filter to bridge across the black matrix grid, eliminating recesses and improving surface planarization without adding vertical complexity.
2Quantity of substance
If spacers are disposed within the recess to maintain spacing, then color filter spacing is maintained, but the recess dimensions increase the amount of liquid crystal required
Solution Approach 1:
The color filter layer is merged with the black matrix region through overlapping, eliminating the need for deep recesses to accommodate spacers. This reduces the overall volume required for liquid crystal while maintaining proper spacing between adjacent color filters through the extended color filter structure itself.
3Shape
If the color filter layer is extended to overlap with the black matrix, then surface planarization is improved, but the first color filter layer must be formed to extend into the black matrix region
Solution Approach 1:
The black matrix is formed first as a grid structure on the substrate, providing a predefined pattern. The color filter layer is then formed to overlap with this pre-existing black matrix structure, allowing the extended color filter to be precisely positioned and aligned with the black matrix grid, simplifying the manufacturing process.
Data Source
AI summary
A display substrate includes a base substrate; a black matrix on the base substrate and in the black matrix region, the black matrix comprising a plurality of rows and a plurality of columns intersecting each other; a first color filter layer having a net structure with a plurality of openings, and comprising a first portion in the first region and a second portion in the black matrix region, the first color filter layer substantially covering the plurality of columns of the black matrix; a second color filter layer in the second region; and a third color filter layer in the third region. A first height of a surface of the first portion away from the base substrate relative to the base substrate and a second height of a surface of the second portion away from the base substrate relative to the base substrate are within 30% of each other.