Color Filter Substrate Spacer Thickness Variation
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Solution Overview
Problem
In display panels, the distance between supporting structures and sealants in peripheral areas is long, leading to inadequate supporting force, resulting in a recessed liquid crystal cell gap at the edge of the display area and a color shift phenomenon that affects display quality.
Innovation Solution
A color filter substrate with first and second photo spacers and corresponding color and dummy-color photoresist patterns, where the second photo spacers have a compression amount equal to their thickness minus the first photo spacers' thickness, and the coverage rates of these patterns determine the thickness difference between the spacers, ensuring a balanced liquid crystal cell gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between supporting structures and sealants in peripheral areas is increased, then the sealing effectiveness is improved, but the supporting force becomes inadequate causing liquid crystal cell gap recess
Solution Approach 1:
The patent applies different photo spacer thicknesses to different regions: the first photo spacers in the display area have a first thickness, while the second photo spacers in the peripheral area have a second thickness greater than the first thickness. This local differentiation provides enhanced supporting force in the peripheral area where the distance to sealant is longer, preventing liquid crystal cell gap recess while maintaining adequate sealing effectiveness.
2Strength
If the photo spacer thickness is increased in peripheral area, then the supporting force is improved, but the liquid crystal cell gap uniformity deteriorates
Solution Approach 1:
The patent implements region-specific photo spacer thickness design where first photo spacers in the display area have a first thickness and second photo spacers in the peripheral area have a second thickness. This local quality approach allows the peripheral area to have greater supporting force without compromising the overall uniformity, as each region's spacer thickness is optimized for its specific functional requirements.
Solution Approach 2:
The patent changes the thickness parameter of photo spacers based on spatial location. By adjusting the thickness parameter from the first thickness in the display area to the second thickness in the peripheral area, the patent optimizes both supporting force and liquid crystal cell gap uniformity according to the specific needs of each region.
3Strength
If different thickness photo spacers are used in different areas, then the supporting force distribution is optimized, but the device complexity increases
Solution Approach 1:
The patent combines multiple photo spacers (first and second photo spacers with different thicknesses) into a single integrated color filter substrate structure. This merging approach allows different thickness regions to coexist within one substrate, optimizing supporting force distribution while avoiding the complexity of assembling separate components.
Data Source
AI summary
A color filter substrate and a display panel are provided. The color filter substrate includes a substrate, first spacers, second spacers, color resist patterns, and at least one dummy-color resist pattern. A first area has a first projection area A. A second area has a second projection area B. The color resist patterns are disposed at least partially around of at least one of the first spacers. A covering area of the color resist patterns in the first area is a. (a/A)*100% is defined as a first coverage rate M. The dummy-color resist pattern is disposed at least partially around of at least one of the second spacers. The covering area of the dummy-color resist pattern in the second area is b. (b/B)*100% is defined as a second coverage rate N. The first projected area A is equal to the second projected area B and 27%≤(N−M)≤58%.