Black Matrix Structure with Asymmetric Trapezoid for High PPI Displays
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Solution Overview
Problem
Current black matrix structures in display devices have a minimum strip width of 2.5 microns, limiting their applicability to higher resolution requirements, such as virtual reality devices, which need resolutions greater than 1200 pixels per inch (PPI).
Innovation Solution
A black matrix structure with strips ranging from 2 to 2.5 microns in width and 4 to 5 microns in distance between adjacent strips, featuring a chamfered isosceles trapezoid shape and a slope angle of 80 to 85 degrees, is developed, along with a manufacturing method involving the formation and partial collapse of trapezoidal truncated cones to reduce strip width and improve resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the black matrix strip width is reduced to increase display resolution, then the resolution capability is improved, but the structural stability and light-shading effectiveness deteriorate
Solution Approach 1:
The black matrix strip employs an asymmetric trapezoidal cross-section with a slope angle of 80-85 degrees, where the wider base provides structural stability and light-shading effectiveness while the narrower top enables closer spacing for high resolution. This asymmetric geometry resolves the contradiction by distributing functional requirements across different dimensions of the same structure.
Solution Approach 2:
The invention transitions from considering only the horizontal width dimension to incorporating the vertical slope dimension. The trapezoidal shape with 80-85 degree slope angle utilizes the vertical dimension to provide structural support and light-shading performance, allowing the horizontal width to be reduced for higher resolution without compromising reliability.
2Measurement precision
If the black matrix strip width is reduced to achieve higher resolution, then the pixel density is improved, but the manufacturing precision requirements worsen
Solution Approach 1:
The invention specifies precise parameter ranges (width: 2-2.5 microns, slope angle: 80-85 degrees, distance between strips: 4-5 microns) that optimize both resolution and manufacturability. By controlling the slope angle within 80-85 degrees, the manufacturing process achieves the required precision for ultra-fine strips while maintaining structural integrity.
Solution Approach 2:
The trapezoidal shape with its wider base acts as a preliminary structural foundation that is easier to manufacture with precision, then tapers to the narrow top section. This preliminary wider base provides a more forgiving manufacturing target before the final narrow dimension is achieved, reducing the overall manufacturing precision burden.
3Measurement precision
If the distance between adjacent black matrix strips is reduced to increase resolution, then the pixel density is improved, but the light-shading performance worsens
Solution Approach 1:
The black matrix strip utilizes a composite structure combining materials with different properties: the lower base portion uses materials optimized for light absorption and shading, while the upper portion uses materials optimized for structural support at minimal width. This composite approach allows reduced spacing while maintaining light-shading performance through material optimization rather than increased width.
Data Source
AI summary
Provided is a black matrix structure. The black matrix structure includes a plurality of black matrix strips that are intersected with each other, wherein a width the black matrix strip ranges from 2 to 2.5 microns, and a distance between any two adjacent black matrix strips in the plurality of black matrix strips ranges from 4 to 5 microns.