Display Panel Via Hole Shielding for Aperture Ratio Equalization
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Solution Overview
Problem
Liquid crystal display devices with two-domain structures face issues of color shift and gray-scale inversion due to differences in aperture ratios between sub-pixel regions, which affect display quality and cause horizontal stripes.
Innovation Solution
A display panel design featuring an array substrate with auxiliary common electrodes connected via via holes and a color filter substrate with via hole shielding and compensation shielding parts, where the shielding parts are strategically placed to equalize aperture ratios and reduce color shift, with the shielding parts being positioned within sub-pixel domains to minimize their impact on adjacent regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If via holes are used to connect auxiliary common electrodes to common electrode, then electrical connectivity is improved, but light leakage and display quality deteriorate
Solution Approach 1:
A via hole shielding layer is introduced as an intermediary component between the via holes and the liquid crystal layer. This shielding layer blocks light from leaking through the via holes while maintaining electrical connectivity through the via holes to the common electrode.
Solution Approach 2:
The via hole shielding layer is selectively positioned only in regions where via holes are present, rather than covering the entire display area. This localized approach blocks light leakage at problem areas while preserving aperture ratio and display quality in other regions.
2Illumination intensity
If aperture ratios of sub-pixel regions are increased, then display brightness is improved, but aperture ratio differences between regions cause color shift and gray-scale inversion
Solution Approach 1:
Black matrix patterns are selectively extended into via hole regions to create localized aperture ratio adjustments. This allows different aperture ratios in different sub-pixel regions to be compensated, achieving uniformity across the display while maintaining high overall brightness.
Solution Approach 2:
The aperture ratio parameter is dynamically adjusted in specific regions by extending the black matrix pattern into via hole areas. This changes the local aperture ratio to compensate for differences caused by via holes, achieving uniform display characteristics across all sub-pixel regions.
3Manufacturing precision
If black matrix pattern is extended to compensate for aperture ratio differences, then display uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The black matrix pattern is segmented into different regions with different extension characteristics. Specifically, the black matrix is extended into via hole regions in a controlled manner, creating a segmented pattern that addresses aperture ratio differences without requiring complete redesign of the entire black matrix structure.
Data Source
AI summary
Provided is a display panel. The display panel comprises an array substrate and a color filter substrate, wherein the color filter substrate comprises a second substrate and a black matrix pattern, wherein the black matrix pattern comprises a body, via hole shielding parts, and compensation shielding parts, the via hole shielding parts being disposed within first domains of part of plurality of sub-pixel regions, the compensation shielding parts being disposed within second domains that are adjacent in first direction to the first domains where the via hole shielding parts are disposed, and at most one of the via hole shielding part and the compensation shielding part being disposed in one sub-pixel region.