OLED Pixel Arrangement Structure for Shadow Effect Reduction
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) pixel structures are limited by a shadow effect during the evaporation process, which reduces the aperture ratio and pixel resolution due to the arrangement of the linear evaporation source and mask plate, leading to increased metal area between openings.
Innovation Solution
The OLED pixel arrangement structure incorporates an inclination angle between the sides of the square openings and the linear evaporation source, forming acute or obtuse angles, which reduces the shadow effect, allowing for higher aperture ratios and resolutions by optimizing the sub-pixel arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance between openings on the mask plate is increased to reduce shadow effect, then the shadow effect is reduced, but the pixel resolution is reduced
Solution Approach 1:
The patent applies asymmetry by rotating the sub-pixel arrangement pattern by 45 degrees relative to the mask plate opening arrangement. This creates an asymmetric configuration where the sub-pixel groups are diagonally oriented rather than aligned with the mask plate openings, which reduces the shadow effect while maintaining high pixel resolution through optimized spatial arrangement.
Solution Approach 2:
The patent introduces a new dimensional relationship by arranging sub-pixels in a diagonal pattern (45-degree rotation) rather than in a standard grid alignment with the mask plate. This dimensional change in the arrangement orientation allows the evaporation process to better fill the spaces between openings, reducing shadows while maintaining resolution.
2Object-affected harmful factors
If the distance between openings on the mask plate is increased to reduce shadow effect, then the shadow effect is reduced, but the aperture ratio is reduced
Solution Approach 1:
The asymmetric 45-degree rotated arrangement of sub-pixel groups relative to the mask plate openings allows for more efficient use of the evaporation area. This configuration reduces the need to increase the distance between openings, thereby maintaining a higher aperture ratio while still minimizing shadow effects through the optimized diagonal pattern.
3Ease of manufacture
If the sub-pixels are arranged in a conventional square pattern aligned with mask plate openings, then the manufacturing process is simple, but the shadow effect is large
Solution Approach 1:
The patent maintains manufacturing simplicity by using a regular grid pattern for the mask plate openings while introducing asymmetry only in the sub-pixel arrangement (45-degree rotation). This selective application of asymmetry reduces shadow effects without significantly complicating the manufacturing process, as the mask plate itself remains unchanged.
Solution Approach 2:
The patent segments the pixel structure into distinct sub-pixel groups arranged in a rotated pattern, separating the sub-pixel arrangement from the mask plate opening arrangement. This segmentation allows independent optimization of each component, maintaining simple mask plate manufacturing while achieving reduced shadow effects through the rotated sub-pixel group configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration minimizes the shadow effect, enhancing the aperture ratio and pixel resolution of OLED displays by adjusting the sub-pixel group orientations relative to the evaporation source, thereby improving manufacturing outcomes.
Implementation Method 1
In the evaporation process, since the linear evaporation source is arranged along the horizontal line, the scanning direction is perpendicular to the horizontal line
Data Source
AI summary
An organic light emitting diode pixel arrangement structure includes multiple first sub-pixels, multiple second sub-pixels, and multiple third sub-pixels. Two adjacent first sub-pixels are arranged in a first sub-pixel group, two adjacent second sub-pixels are arranged in a second sub-pixel group, two adjacent third sub-pixels are arranged in a third sub-pixel group. The multiple sub-pixels form multiple arrays, and each array includes at least one first sub-pixel, at least one second sub-pixel and at least one third sub-pixel, each of the first, second and third sub-pixel groups corresponds to a square opening of a mask plate in an evaporation process, there is an inclination angle between a side of the square opening and an arrangement direction of a linear evaporation source, and the inclination angle is an acute angle or an obtuse angle.