Black Matrix Slit Design for Antistatic and Optical Performance
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Solution Overview
Problem
Liquid crystal display panels face issues with high transmittance and poor antistatic effects due to patterning slits in the black matrix, leading to low process yield and susceptibility to electrostatic breakdown.
Innovation Solution
A black matrix design featuring rectilinear first and second slits in frame regions around the display area, with specific orientations and spacings to achieve low light transmittance while ensuring an effective antistatic effect, including frame regions with varying slit configurations and coatings to minimize light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If patterning slits are set in the black matrix to achieve antistatic effect, then antistatic performance is improved, but light transmittance increases and process yield decreases
Solution Approach 1:
The patent applies different slit configurations to different regions of the black matrix. Frame regions (peripheral areas) are equipped with patterning slits for antistatic function, while the display region maintains high quality black matrix without slits to prevent light leakage. This localized differentiation resolves the contradiction by providing antistatic protection only where structurally necessary, without compromising display quality or excessive light transmittance.
Solution Approach 2:
The black matrix is segmented into functionally distinct regions: frame regions with antistatic slits and display regions with high optical quality. This segmentation allows the antistatic function to be isolated to specific areas, reducing overall light transmittance impact and improving process yield by limiting the complexity of slit patterning to only necessary zones.
2Reliability
If patterning slits are set in the black matrix to achieve antistatic effect, then antistatic performance is improved, but light transmittance increases to about 30%
Solution Approach 1:
By confining patterning slits to frame regions only, the patent maintains low light transmittance in the display region where optical quality is critical. The frame regions serve as peripheral zones where higher transmittance is acceptable, thus resolving the contradiction between antistatic performance and light transmittance control.
Solution Approach 2:
The patent moves the antistatic function from the two-dimensional display area to the peripheral frame dimension. This spatial relocation allows antistatic slits to be positioned in areas that do not directly impact the optical performance of the display region, effectively decoupling antistatic requirements from light transmittance constraints.
3Ease of manufacture
If uniform slit configuration is applied across all frame regions, then manufacturing is simplified, but light leakage occurs at junction regions between frame regions
Solution Approach 1:
The patent introduces asymmetric slit configurations at junction regions where frame regions meet. Instead of uniform slit patterns, the slit arrangements are adapted to account for the geometric discontinuities at junctions, preventing light leakage paths while maintaining reasonable manufacturing complexity. This asymmetric treatment resolves the contradiction by targeting specific problem areas rather than applying uniform simplification.
Solution Approach 2:
Different slit configurations are applied to different frame regions based on their specific functions and positions. Junction regions receive specialized slit patterns to prevent light leakage, while other frame regions use standard configurations for manufacturing efficiency. This localized differentiation resolves the contradiction between manufacturing simplicity and light leakage prevention.
Data Source
AI summary
Disclose are a display substrate, a liquid crystal display panel and a display device. The display substrate is provided with a display region. The display substrate includes: a base substrate, and a black matrix arranged on a side of the base substrate. The black matrix includes: a first region corresponding to the display region, and a plurality of frame regions arranged on a periphery of the first region. At least one rectilinear first slit and at least one rectilinear second slit intersecting with the at least one rectilinear first slit are arranged in the at least one of the frame regions, and an extending direction of the at least one rectilinear first slit is same as an extending direction of the at least one of the frame regions.