Display Substrate Triangular Pixel Layout for Color Purity
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Solution Overview
Problem
Existing OLED display technologies face issues with color mixing and reduced aperture ratio due to film-layer overlapping between sub-pixels, particularly in the Real RGB pixel arrangement mode, which affects display quality and efficiency.
Innovation Solution
A novel pixel arrangement where the centers of sub-pixels are positioned at the vertices of a virtual triangle, with intersecting directions of sub-pixel queues, ensuring that more than half of each sub-pixel region is on one side of the connecting line, reducing film-layer overlapping and increasing pixel opening sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub-pixels are arranged in a conventional grid pattern, then manufacturing is simple, but film-layer overlapping occurs causing color mixing and reduced aperture ratio
Solution Approach 1:
The patent applies asymmetry by positioning the centers of sub-pixels at vertices of a virtual triangle rather than a conventional grid pattern. This asymmetric triangular arrangement ensures that connecting lines between sub-pixel centers form specific angles with pixel queue directions, preventing film-layer overlapping while maintaining manufacturing feasibility through standardized deposition processes.
2Productivity
If sub-pixel spacing is reduced to increase pixel density, then resolution improves, but film-layer overlapping increases causing color mixing
Solution Approach 1:
The asymmetric triangular arrangement allows sub-pixels to be positioned closer together while maintaining adequate separation in critical directions. The specific geometric configuration ensures that even at reduced spacing, the film deposition from adjacent sub-pixels does not overlap, preventing color mixing while achieving higher pixel density.
Solution Approach 2:
The patent transitions from a one-dimensional grid concept to a two-dimensional triangular lattice arrangement. This dimensional change in the spatial organization of sub-pixels provides additional geometric freedom, allowing optimized spacing that prevents film-layer overlapping while maximizing pixel density within the available area.
3Use of energy by moving object
If pixel opening size is increased to improve aperture ratio, then optical efficiency improves, but sub-pixel area increases causing color mixing
Solution Approach 1:
The asymmetric triangular positioning allows each sub-pixel to have a larger opening area while the unique geometric arrangement ensures that the expanded sub-pixel regions do not overlap with adjacent sub-pixels. This resolves the contradiction by allowing increased aperture ratio without compromising color purity.
4Manufacturing precision
If sub-pixels are positioned to minimize film-layer overlapping, then color mixing is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the pixel array into repeating triangular units, where each unit contains sub-pixels positioned at vertices of a virtual triangle. This segmentation into standardized geometric modules simplifies the overall manufacturing process while maintaining the precise positioning needed to prevent film-layer overlapping, as the same triangular pattern repeats across the entire display.
Data Source
AI summary
In a displaying base board, each pixel unit includes three sub-pixels. The centers of the first sub-pixel, the second sub-pixel and the third sub-pixel are sequentially located at the vertex positions of a virtual triangle. The connecting line between the center of the first sub-pixel and the center of any one of the other sub-pixels in the same one pixel unit has an included angle with at least one of a first direction and a second direction, which are the directions of extension of the same one queue of the first sub-pixels and intersect. Both of more than a half of the region of the second sub-pixel and at least a half of the region of the third sub-pixel in the same one pixel unit are located on the same one side of the connecting line of the centers of the same one queue of the first sub-pixels.