Color Filter Substrate Disconnected Light-Blocking Pattern
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Solution Overview
Problem
Existing liquid crystal displays (LCDs) face challenges in achieving uniform cell gaps and image quality due to non-flat surfaces of color filter substrates, particularly in white sub-pixel regions where the transparent layer's height differs from colored sub-pixel regions, leading to inconsistent image display.
Innovation Solution
A color filter substrate design featuring a light-blocking pattern with disconnected portions between sub-pixel regions, allowing the transparent layer to flow and couple with adjacent openings, ensuring a flat upper surface and uniform cell gap by connecting first and second openings via these disconnected portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a continuous light-blocking pattern is used to separate sub-pixel regions, then color mixing prevention is improved, but surface flatness deteriorates due to height differences in transparent layers
Solution Approach 1:
The continuous light-blocking pattern is segmented into disconnected portions at specific boundaries between sub-pixel regions. This segmentation allows the transparent layer to have different heights in different sub-pixel regions while preventing color mixing through the light-blocking portions, thus resolving the contradiction between color mixing prevention and surface flatness.
Solution Approach 2:
The light-blocking pattern is applied locally only where needed to prevent color mixing, rather than continuously across all boundaries. By making the light-blocking pattern disconnected at specific locations, the patent achieves local color isolation while maintaining overall surface flatness, allowing the transparent layer to flow uniformly across the substrate.
2Shape
If the transparent layer height is increased in white sub-pixel regions to match colored regions, then surface flatness is improved, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process leverages the natural flow and self-leveling properties of the transparent layer material. By controlling the light-blocking pattern geometry and applying the transparent layer uniformly, the material automatically flows to fill height differences and creates a flat surface without requiring additional complex manufacturing steps such as selective deposition or post-processing leveling.
3Shape
If disconnected portions are added to the light-blocking pattern to improve flatness, then surface uniformity is improved, but light-blocking effectiveness may be reduced
Solution Approach 1:
The light-blocking pattern is strategically segmented into disconnected portions only at boundaries where sub-pixel height differences exist, while maintaining continuous light-blocking in other critical areas. This selective segmentation prevents color mixing at height transition zones while preserving overall light-blocking effectiveness for color isolation.
Solution Approach 2:
The disconnected portions of the light-blocking pattern act as intermediaries that allow the transparent layer to flow and equalize height between sub-pixel regions, while the remaining continuous light-blocking portions maintain color isolation. This intermediary approach resolves the conflict between flatness and light-blocking effectiveness.
Data Source
AI summary
A color filter substrate includes: a first substrate including a first sub-pixel region corresponding to a non-white color region and a second sub-pixel region corresponding to a white color region and adjacent to the first sub-pixel region; a light-blocking pattern disposed on the first substrate, the light-blocking pattern including a first opening corresponding to the first sub-pixel region and a second opening corresponding to the second sub-pixel region; a first color filter having a first color and disposed in the first sub-pixel region; and a transparent layer disposed in the second sub-pixel region and on the first color filter. The light-blocking pattern further includes a disconnected portion between the first sub-pixel region and the second sub-pixel region, and the first and second openings are coupled to each other via the disconnected portion.