OLED Sub-Pixel Layout for Evaporation Margin in High-Resolution Displays
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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 process deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is reduced to improve resolution, then the display resolution is improved, but the manufacturing precision requirement increases and process deviations cause display issues
Solution Approach 1:
The patent changes the geometric parameters of the light emitting region and light emitting layer to resolve the contradiction. Specifically, the light emitting region is designed with a specific aspect ratio (length greater than width), and the light emitting layer is positioned to extend along the length direction with its width direction extending along the width direction of the light emitting region. This parameter optimization allows for smaller pixels while maintaining manufacturing tolerance, as the aspect ratio provides a clear design guideline for fabrication processes.
Solution Approach 2:
The patent introduces a dimensional approach by defining the light emitting region and light emitting layer in terms of their length and width directions, with specific relationships between these dimensions. The light emitting layer's dimensions are deliberately designed to match the light emitting region's dimensions in a specific orientation, adding a dimensional constraint that helps control manufacturing variations and improves resolution without proportionally increasing precision requirements.
2Measurement precision
If the light emitting layer size is reduced to maintain small pixel size, then the pixel density is improved, but the precision margin in evaporation process decreases
Solution Approach 1:
The patent optimizes the parameters of the light emitting layer, specifically its length and width dimensions, to maintain an appropriate size ratio with the light emitting region. The light emitting layer is designed with length extending along the length direction of the light emitting region and width extending along the width direction, creating a proportional relationship that provides sufficient precision margin in the evaporation process while maintaining high pixel density.
Solution Approach 2:
The patent uses dimensional relationships between the light emitting region and light emitting layer to resolve the contradiction. By defining the light emitting layer's dimensions in terms of the light emitting region's dimensions and specifying that the light emitting layer extends along both the length and width directions with appropriate proportions, the design maintains manufacturability while achieving high pixel density.
3Measurement precision
If the light emitting region area is reduced to improve resolution, then the display resolution is improved, but the light emitting layer quality becomes more sensitive to process deviations
Solution Approach 1:
The patent changes the geometric parameters of the light emitting region and light emitting layer to improve resolution while maintaining quality stability. The light emitting region is designed with a specific aspect ratio (length greater than width), and the light emitting layer is positioned to extend along the length direction with its width direction extending along the width direction of the light emitting region. This parameter optimization provides a buffer against process deviations while achieving high resolution.
Solution Approach 2:
The patent introduces dimensional relationships that provide robustness against process deviations. The light emitting layer is designed with specific dimensional relationships to the light emitting region, extending along both the length and width directions with controlled proportions. This dimensional approach creates a design margin that maintains light emitting layer quality stability even as the overall area is reduced for higher resolution.
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.