Polygonal Display Substrate Layout for Lower OLED Driving Current
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Solution Overview
Problem
In OLED displays, the large distance between sub-pixels results in a small sub-pixel aperture area, necessitating high driving current, which accelerates device aging and shortens the display's lifetime.
Innovation Solution
A display substrate with alternately arranged first and second pixels, forming a windmill-like structure, where each pixel includes sub-pixels in polygonal shapes, allowing for closer sub-pixel arrangement and increased aperture area under the same resolution, thereby reducing driving current and extending the display's lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub-pixels are arranged with large distance between them, then manufacturing is easier, but sub-pixel aperture area becomes small requiring high driving current
Solution Approach 1:
The patent applies asymmetry by using different shapes for different sub-pixel types: first and third sub-pixels are triangular while second sub-pixels are quadrangular. This asymmetric arrangement allows optimized positioning and closer spacing between adjacent sub-pixels of different types, increasing aperture area without compromising manufacturing feasibility through standardized fabrication processes
Solution Approach 2:
The patent transitions from conventional linear or grid arrangements to a two-dimensional staggered layout where triangular and quadrangular sub-pixels interlock in alternating rows. This dimensional optimization enables closer packing in both horizontal and vertical directions, maximizing aperture area while maintaining manufacturability through systematic patterning
2Use of energy by moving object
If sub-pixel aperture area is increased by reducing distance between sub-pixels, then driving current is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the display into alternating rows of different sub-pixel configurations: first rows contain first and third triangular sub-pixels with second quadrangular sub-pixels positioned in between, while second rows reverse this pattern. This segmented alternating structure simplifies manufacturing by breaking down the complex arrangement into repeatable unit cells with standardized positioning, reducing precision requirements while enabling closer sub-pixel spacing
Solution Approach 2:
The patent changes the geometric parameters of sub-pixels by using triangular shapes for first and third sub-pixels and quadrangular shapes for second sub-pixels. These specific geometric parameters are optimized to achieve maximum aperture area while maintaining feasible manufacturing tolerances, as the shapes naturally accommodate closer spacing without requiring extreme positioning precision
3Illumination intensity
If high driving current is used to compensate for small aperture area, then display brightness is maintained, but device aging accelerates and lifetime shortens
Solution Approach 1:
The patent merges first, second, and third sub-pixels of different shapes into closely packed alternating rows, combining their light-emitting areas to achieve high aperture ratio. This merged arrangement increases total light output area, allowing reduced driving current per sub-pixel while maintaining overall display brightness, thereby extending device lifetime by reducing stress on individual OLED elements
Data Source
AI summary
A display substrate includes a plurality of first pixels and a plurality of second pixels alternately arranged in a first direction and a second direction. Each of the first pixels includes a first sub-pixel and a second sub-pixel, and each of the second pixels includes a third sub-pixel and a second sub-pixel. The second sub-pixels are evenly arranged in a matrix. The first sub-pixel and the third sub-pixel are both in a polygonal shape, and are alternately arranged in the first direction and the second direction. For one first sub-pixel and one third sub-pixel adjacent to each other in the first direction, a line connecting a vertex of the one first sub-pixel closest to the one third sub-pixel with a vertex of the one third sub-pixel closest to the one first sub-pixel intersects an extension line in the first direction and an extension line in the second direction.