OLED Display Substrate and Fine Metal Mask Layout for Larger Apertures
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Solution Overview
Problem
OLED displays face challenges with large sub-pixel distances leading to reduced sub-pixel aperture areas and increased driving current, which shortens device lifetime.
Innovation Solution
A display substrate design with alternately arranged first and second pixels in intersecting directions, featuring polygonal sub-pixels with staggered vertexes, allowing for closer sub-pixel arrangements and increased aperture areas, using fine metal masks with staggered opening regions to enhance resolution and reduce driving current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If traditional sub-pixel arrangement is used, then manufacturing is simpler, but sub-pixel aperture area is reduced and driving current increases
Solution Approach 1:
The patent applies asymmetry by using different shapes for different sub-pixels: first and third sub-pixels are triangular while second sub-pixels are quadrangular. This asymmetric design allows optimized packing arrangements that increase aperture area while maintaining manufacturability through the systematic use of fine metal masks with corresponding asymmetric opening regions.
Solution Approach 2:
The patent utilizes staggered arrangements where vertices of adjacent sub-pixels in different directions are offset from each other, creating a two-dimensional optimization pattern. This dimensional staggering allows sub-pixels to be positioned more efficiently in both horizontal and vertical directions, maximizing aperture area without increasing overall device complexity.
2Area of moving object
If sub-pixel distance is reduced, then aperture area increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the pixel structure into distinct triangular and quadrangular sub-pixel segments with clearly defined vertices and edges. This segmentation approach, combined with corresponding segmented opening regions in the fine metal masks, enables precise positioning through standardized manufacturing processes while maintaining reduced sub-pixel distances for increased aperture area.
Solution Approach 2:
The patent changes the geometric parameters of sub-pixels by using specific triangular and quadrangular shapes with defined vertex positions. These parameter changes allow for optimized spacing and positioning that increase aperture area while remaining within achievable manufacturing precision limits through the use of patterned fine metal masks.
Data Source
AI summary
First sub-pixels and third sub-pixels are alternated in first and second directions to form first type of rows along the first direction and first type of columns along the second direction, and second sub-pixels form second type of rows along the first direction and second type of columns along the second direction. In at least one first type of row, a connection line between centers of first and third sub-pixels adjacent to each other is not parallel to the first direction, a connection line between centers of first sub-pixels adjacent to each other is parallel to the first direction, and a connection line between centers of third sub-pixels adjacent to each other is parallel to the first direction. In at least one of the second type of rows, a connection line between centers of second sub-pixels adjacent to each other is parallel to the first direction.