Display Substrate Pixel Electrode Layout for High-Density AMOLED
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Solution Overview
Problem
The increasing pixel density in AMOLED display substrates limits the design space for pixel circuits, necessitating an optimization of the pixel structure and manufacturing process to improve display performance.
Innovation Solution
The display substrate incorporates a design where sub-pixels have pixel electrodes with interconnected main body and connection portions, featuring non-overlapping orthogonal projections and specific angular relationships, along with optimized layer arrangements to enhance layout efficiency and light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased in AMOLED display substrates, then display resolution is improved, but design space for pixel circuits is reduced
Solution Approach 1:
The pixel electrode connection portion is designed to extend in a direction intersecting with the arrangement direction of sub-pixels (at angles between 80°-100°), utilizing spatial dimensions more efficiently. This dimensional reorientation allows the connection portion to pass through or overlap with adjacent sub-pixel regions without increasing the overall pixel area, thereby maintaining design space while supporting higher pixel density
Solution Approach 2:
The connection portion of the pixel electrode is positioned to overlap with or pass through the light-emitting regions of adjacent sub-pixels. By nesting the connection structure within the spatial envelope of neighboring sub-pixels, the design minimizes additional area consumption while maintaining electrical connectivity, thus preserving design space for pixel circuits at high pixel densities
2Measurement precision
If pixel size is reduced to increase pixel density, then display resolution is improved, but layout efficiency is worsened
Solution Approach 1:
The pixel electrode is designed with an asymmetric structure where the main body portion has a specific shape matching the light-emitting region, while the connection portion extends in a different direction and orientation. This asymmetric design allows optimized packing and arrangement of pixel circuits, improving layout efficiency even as pixel size is reduced for higher density displays
Solution Approach 2:
By orienting the connection portion at intersecting angles (80°-100°) relative to the sub-pixel arrangement direction, the design utilizes angular dimensions to achieve better spatial utilization. This dimensional approach simplifies the overall layout by creating more regular, predictable patterns that are easier to manufacture and assemble at high pixel densities
3Device complexity
If connection portion overlaps with adjacent sub-pixel light-emitting regions, then layout efficiency is improved, but light transmittance is reduced
Solution Approach 1:
The main body portion of the pixel electrode is designed to precisely match the shape of the light-emitting region, ensuring optimal light transmittance where it matters most. The connection portion, while overlapping with adjacent sub-pixels, is positioned and shaped to minimize its impact on light emission, creating local quality differences that prioritize light output in critical areas while maintaining layout efficiency through strategic overlap in less critical regions
Data Source
AI summary
A display substrate includes a base substrate and a plurality of sub-pixels. A sub-pixel includes a pixel electrode and an effective light-emitting region. The pixel electrode includes a main body portion and a connection portion that are interconnected. Shapes of the main body portion and the effective light-emitting region are the same, and at least partial borders of the main body portion and the pixel electrode coincide. The plurality of sub-pixels at least include a first sub-pixel and a second sub-pixel, and light emitted by the first sub-pixel and second sub-pixel is the same.