OLED Sub-Pixel Layout for High-Resolution Mask-Limited Displays
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Solution Overview
Problem
Existing OLED devices face challenges in achieving high resolution due to the limitations imposed by the process margin required for fine metal masks, leading to reduced sub-pixel sizes and increased power consumption, which hinders the development of high-resolution displays.
Innovation Solution
The arrangement of sub-pixels is optimized by aligning sub-pixels of the same color adjacent to each other, with increased size and reduced distance between sub-pixels of the same color, while maintaining sufficient distance between sub-pixels of different colors, allowing for efficient use of fine metal masks and minimizing non-emission areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sub pixels of adjacent pixels are aligned only in one direction (prior art), then manufacturing is simpler, but display quality and resolution are limited
Solution Approach 1:
The patent transitions from single-direction sub pixel alignment to two-directional alignment by arranging sub pixels in both horizontal and vertical directions. This dimensional expansion enables higher resolution and better display quality while maintaining manufacturing feasibility through systematic patterning processes.
Solution Approach 2:
The pixel structure is segmented into multiple sub pixels (red, green, blue) arranged in specific two-directional patterns. This segmentation allows each sub pixel to be independently controlled and positioned, achieving precise alignment in both directions while maintaining overall pixel functionality.
2Ease of manufacture
If green sub pixels are positioned at corners of pixel electrodes (prior art), then manufacturing is easier, but moire patterns occur and display quality deteriorates
Solution Approach 1:
The patent employs asymmetric positioning of green sub pixels relative to the pixel electrode structure, specifically placing them at offset positions rather than symmetric corner positions. This asymmetric arrangement disrupts the periodic patterns that cause moire effects while maintaining manufacturability through adjusted photomask designs.
Solution Approach 2:
Different sub pixel types (red, green, blue) are positioned at different local positions within the pixel structure. The green sub pixels are specifically positioned at offset locations to eliminate moire patterns, while red and blue sub pixels maintain their traditional positioning, creating locally optimized quality without compromising overall manufacturing ease.
Data Source
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AI summary
Discussed is an organic light emitting display device including a plurality of pixels, where red sub pixels and blue sub pixels of adjacent pixels are aligned in a first direction and are also aligned in a second direction, the second direction being a direction that intersects the first direction. Also, the green pixels of adjacent pixels are aligned in the first direction and are also aligned in the second direction. And the at least one green sub pixel of each pixel is disposed between the at least one red sub pixel and the at least one blue sub pixel of the each pixel, and the at least one green sub pixel is offset from the at least one red sub pixel and the at least one blue sub pixel in the first direction and the second direction in the each pixel.