Fine Metal Mask Layout for Compact OLED Sub-Pixel Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLED displays face challenges in achieving high resolution and long device lifetime due to large sub-pixel distances leading to increased driving current and accelerated aging.
Innovation Solution
A display substrate design with alternately arranged first and second pixels in intersecting directions, featuring polygonal sub-pixels with staggered vertexes, and a fine metal mask set with corresponding opening regions to enhance sub-pixel aperture area and reduce distance between adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sub-pixel distance is reduced to increase resolution, then manufacturing precision and device complexity increase
Solution Approach 1:
The pixel array is segmented into different types (first pixels with first sub-pixels and second pixels with second sub-pixels) that are alternately arranged. This segmentation allows for optimized sub-pixel spacing and aperture area distribution, achieving high resolution without uniformly reducing all sub-pixel distances which would otherwise increase manufacturing precision requirements and device complexity
Solution Approach 2:
The patent employs asymmetric sub-pixel aperture area design where first sub-pixels and second sub-pixels have different aperture areas. This asymmetric arrangement optimizes the overall display resolution and light emission efficiency while maintaining manageable manufacturing precision and device complexity through non-uniform distribution
2Illumination intensity
If sub-pixel aperture area is increased to improve brightness, then driving current increases causing accelerated aging
Solution Approach 1:
Different regions of the display utilize sub-pixels with different aperture areas (first sub-pixels with larger aperture and second sub-pixels with smaller aperture). This local quality differentiation optimizes brightness distribution across the display while controlling overall driving current, thereby improving illumination intensity without uniformly increasing current that would cause accelerated aging
Solution Approach 2:
The patent changes the aperture area parameter of sub-pixels by introducing multiple types with different aperture sizes. This parameter variation allows optimization of brightness output while distributing the driving current load, thus achieving improved illumination intensity without the penalty of uniformly high current that accelerates device aging
Data Source
AI summary
A display substrate is provided, including: first sub-pixels, second sub-pixels and third sub-pixels. The first sub-pixels and the third sub-pixels form a first type of rows along the first direction and a first type of columns along the second direction. The second sub-pixels form a second type of rows along the first direction and a second type of columns along the second direction. Within a same one of the first type of rows or a same one of the first type of columns, a first straight line connecting midpoints of a pair of opposite edges of the first sub-pixel and passing through a center of the first sub-pixel is parallel to but does not coincide with a second straight line connecting midpoints of a corresponding pair of opposite edges of the third sub-pixel and passing through a center of the third sub-pixel.