OLED Pixel Structure with Asymmetric Sub-Pixels for High PPI
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Solution Overview
Problem
Conventional RGB pixel arrangements in OLED display screens face limitations in achieving high Pixel Per Inch (PPI) and aperture ratio, making it difficult to meet the demands for high-resolution displays.
Innovation Solution
A novel pixel structure and evaporation mask design where pixel unit groups consist of first, second, and third sub-pixels with non-parallel edges, shared mask openings, and polygonal shapes, allowing for increased PPI and aperture ratio through optimized sub-pixel arrangements and mask configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional RGB side-by-side pixel arrangement is used, then the structure is simple and easy to manufacture, but the PPI and aperture ratio cannot exceed 200-300, failing to meet high-resolution display requirements
Solution Approach 1:
The patent transforms the conventional symmetric rectangular sub-pixel arrangement into an asymmetric design where the third sub-pixel has a triangular shape with one vertex pointing toward the bridge. This asymmetric configuration allows the sub-pixels to be positioned closer to the bridge without increasing shadowing effects, thereby increasing the aperture ratio and PPI while maintaining manufacturing feasibility through the systematic design of the evaporation mask
Solution Approach 2:
The patent introduces a new spatial dimension by arranging sub-pixels in a triangular configuration rather than the conventional linear side-by-side arrangement. The third sub-pixel extends toward the bridge in a direction that optimizes space utilization, allowing closer positioning without compromising the light-emitting area, thus achieving higher PPI and aperture ratio
2Object-affected harmful factors
If sufficient distance is maintained between sub-pixels and bridge to avoid shadowing effect, then shadowing is avoided, but the length of sub-pixels decreases and aperture ratio is affected
Solution Approach 1:
The asymmetric triangular design of the third sub-pixel allows it to approach the bridge closely without creating significant shadowing, as the triangular shape minimizes the blocking area compared to a rectangular sub-pixel of the same area. This resolves the contradiction by enabling close positioning while maintaining light emission efficiency
Solution Approach 2:
The patent applies different geometric characteristics to different sub-pixels: the first and second sub-pixels maintain rectangular shapes optimized for their respective positions, while the third sub-pixel adopts a triangular shape specifically designed to minimize shadowing when positioned close to the bridge. This localized optimization allows each sub-pixel to achieve its maximum effective area without compromising others
3Ease of manufacture
If rectangular sub-pixels with equal light-emitting areas are used, then the structure is regular and easy to manufacture, but the aperture ratio and PPI are limited
Solution Approach 1:
The patent introduces asymmetric triangular shaping for the third sub-pixel while maintaining symmetric arrangement principles for the overall pixel structure. This controlled asymmetry increases the aperture ratio and PPI by allowing closer positioning to the bridge, while the systematic design of the evaporation mask ensures manufacturability is maintained
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the PPI and aperture ratio, enabling higher resolution displays while improving the strength and stability of the evaporation mask, thus overcoming the limitations of conventional designs.
Implementation Method 1
OLED evaporation technology applies the conventional RGB Stripe arrangements for evaporation
Implementation Method 2
the organic light-emitting component is formed at a position corresponding to pixels on an array substrate through using a Fine Metal Mask (FMM) under evaporation
Data Source
AI summary
The present disclosure provides a pixel structure, an OLED display screen, and an evaporation mask. The pixel structure includes a plurality of pixel unit groups arranged in an array. Each of the pixel unit groups includes a first sub-pixel, a second sub-pixel and a third sub-pixel. An edge of the first sub-pixel close to the third sub-pixel is not parallel to an edge of the first sub-pixel away from the third sub-pixel. An edge of the second sub-pixel close to the third sub-pixel is not parallel to an edge of the second sub-pixel away from the third sub-pixel. At least two adjacent first sub-pixels and/or at least two adjacent second sub-pixels of at least two adjacent pixel unit groups are formed by a same mask opening in the evaporation mask.