Black Matrix Aperture Layout for Side-View Micro LED Uniformity
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Solution Overview
Problem
Existing display devices face issues with stains and luminance differences at side viewing angles due to the transfer tolerance in micro LED transfer processes, which affect display quality and require separate compensation for luminance differences.
Innovation Solution
The display device incorporates a black matrix with transmissive holes of varying sizes based on a virtual boundary line, where the size of the transmissive hole far from the virtual boundary line is reduced to minimize reflection visibility and improve display quality at side viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform transmissive holes are used in the black matrix, then manufacturing is simplified, but stains and luminance differences appear at side viewing angles due to transfer tolerance
Solution Approach 1:
The patent applies local quality by varying the size of transmissive holes in the black matrix based on their position relative to the virtual boundary line. Holes closer to the boundary line are made larger to compensate for transfer tolerance and prevent stains, while holes farther away are smaller to maintain display quality. This localized differentiation resolves the contradiction between manufacturing simplicity and display quality consistency.
2Reliability
If transmissive holes are made larger to prevent stains, then display quality at side viewing angles improves, but reflection visibility increases
Solution Approach 1:
The patent resolves this contradiction by making transmissive holes larger only in specific locations near the virtual boundary line where stains occur, while keeping holes smaller in other areas. This localized approach prevents stains at critical positions without unnecessarily increasing reflection visibility across the entire display.
Solution Approach 2:
The patent introduces asymmetry in the transmissive hole sizes based on their distance from the virtual boundary line. This asymmetric design allows the display to compensate for transfer tolerance effects specifically where they occur (near boundaries) while maintaining optimal display quality in other regions, thereby preventing stains without uniformly increasing reflection visibility.
3Reliability
If separate compensation for luminance differences is implemented, then display quality is maintained, but device complexity and power consumption increase
Solution Approach 1:
The patent applies preliminary action by pre-compensating for luminance differences through the varied transmissive hole sizes in the black matrix during the manufacturing stage. This structural compensation is built into the display device itself, eliminating the need for separate runtime compensation mechanisms and reducing both device complexity and power consumption while maintaining luminance uniformity.
Data Source
AI summary
A display device includes a substrate; a plurality of light-emitting elements arranged in each of a plurality of transfer areas on the substrate; and a black matrix having a plurality of transmissive holes each corresponding to one of the plurality of light-emitting elements, wherein the plurality of transfer areas include a first transfer area and a second transfer area arranged adjacent to each other, the black matrix includes a first area corresponding to the first transfer area and a second area corresponding to the second transfer area, the first area and the second area are arranged adjacent to each other based on a virtual boundary line, the first area includes a first transmissive hole disposed at a first distance from the virtual boundary line and a second transmissive hole disposed at a second distance from the virtual boundary line, and a size of the first transmissive hole is larger than a size of the second transmissive hole.