Curved Display Black Matrix Alignment for Color Crosstalk Control
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Solution Overview
Problem
Curved display devices suffer from color crosstalk and reduced display quality due to the misalignment of black matrices caused by substrate curvature, leading to color mixing and decreased aperture ratio and brightness.
Innovation Solution
The black matrix is designed with equal-width open portions and adjusted central line alignment to border lines of adjacent color filters, ensuring consistent coverage of data lines across different panel portions to prevent color crosstalk and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the black matrix is formed on a curved substrate without adjustment, then the substrate curvature is accommodated, but the black matrix misaligns with data lines causing color crosstalk
Solution Approach 1:
The patent applies local quality by differentiating the black matrix design into multiple panel portions (first, second, third panel portions) with distinct characteristics. Each panel portion has specifically designed open portions with different widths and positions relative to color filters, allowing the black matrix to adapt to local curvature variations while maintaining proper alignment with data lines in each region
Solution Approach 2:
The black matrix is segmented into multiple discrete open portions corresponding to different panel portions. Each open portion is independently designed with specific width and position parameters, allowing the black matrix structure to be divided into manageable segments that can be precisely controlled to prevent color crosstalk in each segment while accommodating overall substrate curvature
2Reliability
If the black matrix width is increased to cover data lines, then color crosstalk is reduced, but the aperture ratio and brightness decrease
Solution Approach 1:
The patent implements local quality by varying the open portion width of the black matrix across different panel portions. The first panel portion has a first open portion width, while the second and third panel portions have different widths, allowing each region to have optimized black matrix coverage that prevents color crosstalk while maximizing light transmission and aperture ratio for that specific location
Solution Approach 2:
The patent applies parameter changes by modifying the width parameter of the black matrix open portions in different panel portions. By changing the width parameter locally rather than uniformly across the entire display, the design achieves adequate data line coverage for color crosstalk prevention while maintaining larger open areas for improved aperture ratio and brightness in specific regions
Data Source
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AI summary
A curved display device includes: first and second substrates a first panel portion at a center thereof and second and third panel portions at both sides of the first panel portion; gate and data lines crossing each other to define a sub-pixel; a black matrix having an open portion corresponding to the sub-pixel; and first to third color filters between the black matrix and the first substrate, wherein the black matrix between the open portions has first to third BM widths in the first to third panel portions, respectively, wherein the open portion has first to third OP widths in the first to third panel portions, respectively, wherein each of the second and third BM widths is equal to or greater than the first BM width, and wherein the second and third BM widths are equal to each other.