OLED Substrate Pixel Group Segmentation for Color Mixing Prevention
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Solution Overview
Problem
Current OLED fabrication methods using fine metal masks face challenges in achieving high resolution due to color mixing and increased processing difficulty, particularly with densely arranged pixels that require precise alignment and small opening sizes in the mask.
Innovation Solution
A light-emitting substrate design with distinct pixel groups and sub-pixels arranged in a specific pattern, including first, second, and third pixel groups with defined intervals between them and their sub-pixels, to prevent color mixing and improve resolution without shrinking mask openings, utilizing a substrate with first sub-pixels, second sub-pixels, and third sub-pixels of different colors arranged in a staggered and corresponding manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixels are arranged in a small and dense manner to achieve high resolution, then the pixel size is reduced and more pixels can be arranged on the substrate, but color mixing occurs between adjacent pixels
Solution Approach 1:
The invention introduces a third pixel group between the first and second pixel groups, effectively segmenting the pixel arrangement into three distinct groups. This segmentation creates additional spatial separation and buffer zones that prevent color mixing while maintaining high pixel density for improved resolution
Solution Approach 2:
The patent employs a staggered arrangement where pixel units in adjacent rows are offset by half a pixel unit width. This dimensional reorganization in the vertical direction creates diagonal spacing patterns that increase effective distance between adjacent pixels of different colors, preventing color mixing while maintaining high horizontal resolution
2Measurement precision
If the openings in the fine metal mask are made small to form smaller pixels, then high resolution is achieved, but the alignment accuracy requirements increase and processing difficulty increases
Solution Approach 1:
By dividing the pixel array into three distinct pixel groups with different sub-pixel configurations, the invention allows each group to be fabricated with optimized mask opening sizes. This segmentation enables larger, easier-to-manufacture openings in each mask while achieving high overall resolution through the combined three-group structure
Solution Approach 2:
Each pixel group has locally optimized sub-pixel arrangements (first group with four sub-pixels, second group with four sub-pixels, third group with two sub-pixels) that are tailored to specific regional requirements. This local quality approach allows different mask opening configurations for different groups, simplifying manufacturing while maintaining high resolution
3Measurement precision
If pixels are arranged in a dense manner to improve resolution, then more pixels fit on the substrate, but the alignment accuracy of the fine metal mask must be precisely controlled
Solution Approach 1:
The three-pixel-group structure with distinct sub-pixel configurations creates naturally aligned reference patterns during fabrication. Each group's specific arrangement (4-4-2 sub-pixel configuration) provides built-in alignment markers that simplify mask positioning and reduce the stringency of alignment accuracy requirements while maintaining high resolution
Solution Approach 2:
The third pixel group acts as an intermediary structure between the first and second pixel groups, providing a buffer zone and reference framework that facilitates accurate mask alignment. This intermediate group with its specific two-sub-pixel configuration serves as a alignment reference that simplifies the positioning of subsequent masks
Data Source
AI summary
A light-emitting substrate and a display device are provided. The light-emitting substrate including a substrate, and a first pixel group and a second pixel group arranged on the substrate and spaced apart from each other, wherein a third pixel group is disposed between the first pixel group and the second pixel group, a first interval is defined between the first pixel group and the third pixel group, and between the second pixel group and the third pixel group, a second interval is defined between adjacent first sub-pixels of the first pixel group, a third interval is defined between adjacent second sub-pixels of the second pixel group, a fourth interval is defined between adjacent third sub-pixels of the third pixel group, and the first sub-pixels, the second sub-pixels, and the third sub-pixels are all different in colors.