Teeth-Shaped Light Shielding for LCD Color Filter Uniformity
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Solution Overview
Problem
The existing color filter substrates for liquid crystal displays face issues with step differences between color-resists and light shielding strips, leading to non-uniform rubbing and potential breaking of the color-resist layer, resulting in uneven brightness and display quality.
Innovation Solution
The implementation of teeth-shaped structures on both color-resists and light shielding strips, where the distance between adjacent teeth is less than twenty times the thickness of the light shielding strips, to gradually vary the step difference during the rubbing process, ensuring uniform rubbing and preventing layer breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light shielding strips are arranged to overlap with color-resists to prevent light leakage, then light shielding effectiveness is improved, but step differences occur between overlapping and non-overlapping areas causing non-uniform rubbing and potential layer breakage
Solution Approach 1:
The light shielding strip is segmented into multiple teeth-shaped structures instead of a continuous strip. This segmentation creates multiple small overlap regions distributed across the color-resist, reducing the cumulative step difference effect while maintaining light shielding effectiveness. The teeth-shaped structures are spaced at specific intervals to balance light blocking with surface uniformity.
Solution Approach 2:
The patent applies different structural characteristics to different regions: the teeth-shaped structures create localized overlap regions with controlled geometry. Each tooth has specific height, width, and spacing parameters that are optimized to maintain light shielding in critical areas while minimizing step differences in rubbing regions. This local differentiation allows simultaneous achievement of light shielding and surface uniformity.
2Reliability
If the orientation layer is rubbed to generate pre-inclination angle for liquid crystal molecules, then liquid crystal alignment is improved, but the color-resist layer may break due to step differences in overlapping areas
Solution Approach 1:
By segmenting the light shielding strip into teeth-shaped structures, the rubbing process encounters multiple small step differences rather than one large step difference. This segmentation distributes the mechanical stress during rubbing across multiple small transitions, preventing concentration of stress that would cause color-resist layer breakage while still achieving the necessary pre-inclination angle for liquid crystal alignment.
Solution Approach 2:
The teeth-shaped structures are designed with specific geometric parameters (height, width, spacing) that cushion the rubbing process. The gradual height reduction from the base toward the tooth tips creates a cushioning effect that softens the transition during rubbing, protecting the color-resist layer from breaking while allowing sufficient rubbing action to establish liquid crystal pre-inclination.
3Manufacturing precision
If sequential exposure operations are used to manufacture color-resists in red, green and blue, then color filter precision is improved, but the process complexity and time increase
Solution Approach 1:
The light shielding strip is segmented into teeth-shaped structures that can be manufactured in a single exposure step. This segmentation allows the light shielding pattern to be created simultaneously with or independently of the color-resist patterns, potentially reducing the total number of sequential exposure operations needed while maintaining the precision required for color filter alignment.
Data Source
AI summary
The present invention discloses a color filter substrate, a liquid crystal display panel, and a display device so as to lower step differences between color-resists and light shielding strips on the color filter substrate to thereby avoid non-uniform rubbing or the color-resist layer being broken while an orientation layer is being rubbed for orientation from occurring due to the step differences, thus avoiding non-uniformity of brightness and hence improving a quality of display. The color film substrates includes a plurality of color-resists arranged spaced from each other, and light shielding strips arranged in gaps between every two adjacent color-resists, wherein the respective color-resists and the light shielding strips adjacent thereto overlap in respective overlap areas each including a plurality of teeth-shaped structures, and a distance between tops of two adjacent ones of the teeth-shaped structures is less than twenty times a thickness of the light shielding strip.