Display Panel Subpixel Layout for High-Resolution Uniformity
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Solution Overview
Problem
The challenge of improving display quality in organic light emitting display devices, particularly in high-resolution displays, is exacerbated by the difficulty in manufacturing processes that require precise pixel sizing and spacing, leading to increased costs and potential display issues such as dark spots and uneven brightness.
Innovation Solution
A display panel design with alternating arrangements of first and second color sub-pixels, where the second color sub-pixels have larger effective light emitting regions relative to their light emitting layers, allowing for a larger precision margin in the evaporation process, thereby stabilizing the quality of the light emitting layers and reducing the impact of manufacturing deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is reduced to improve display resolution, then the display quality is improved, but the manufacturing precision requirement increases and defects such as dark spots and uneven brightness occur more frequently
Solution Approach 1:
The patent applies different design strategies to different sub-pixel types. Specifically, sub-pixels with smaller effective light emitting regions (such as blue sub-pixels) are given larger process margins in the evaporation process compared to sub-pixels with larger effective light emitting regions. This local differentiation allows each sub-pixel type to be optimized according to its specific characteristics, thereby improving overall manufacturing precision while maintaining high display resolution.
2Measurement precision
If the pixel size is reduced to improve display resolution, then the display quality is improved, but the display uniformity deteriorates due to manufacturing deviations
Solution Approach 1:
The patent changes the process margin parameter differently for different sub-pixel types based on their effective light emitting region sizes. Sub-pixels with smaller effective light emitting regions are allocated larger process margins, while sub-pixels with larger effective light emitting regions are allocated smaller process margins. This parameter adjustment compensates for the increased sensitivity to manufacturing deviations that occurs with smaller pixel sizes, thereby maintaining display uniformity while achieving high resolution.
3Reliability
If the manufacturing precision is increased to reduce defects, then the display quality is improved, but the manufacturing cost increases
Solution Approach 1:
Instead of uniformly increasing manufacturing precision for all sub-pixels, the patent applies precision requirements locally based on sub-pixel characteristics. Sub-pixels with smaller effective light emitting regions receive higher precision control with larger process margins, while sub-pixels with larger effective light emitting regions use standard process margins. This selective approach improves display quality where needed without unnecessarily increasing manufacturing costs across the entire panel.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a first color sub-pixels and a second color sub-pixel. The first color sub-pixel includes a first effective light emitting region, the second color sub-pixel includes a second effective light emitting region. The first color sub-pixel includes a first color light emitting layer, the second color sub-pixel includes a second color light emitting layer, for one second effective light emitting region, along the length direction, a difference between the maximum size of the second color light emitting layer and the maximum size of the second effective light emitting region is a first difference, and along the width direction, a difference between the maximum size of the second color light emitting layer and the maximum size of the second effective light emitting region is a second difference, and the first difference is less than the second difference.