Display Substrate Planarization Layer Segmentation for Anode Flatness
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Solution Overview
Problem
OLED display panels suffer from poor chromatic aberration symmetry due to uneven surfaces of anode patterns, leading to inconsistent color display when viewed from different directions, which affects the overall display performance.
Innovation Solution
A display substrate with a planarization layer comprising a first and second part, where the orthographic projection of the first part coincides with the functional pattern, and the second part does not overlap, ensuring identical heights and flatness, along with an optional compensation functional pattern and planarization layer to address surface unevenness and chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional planarization layer is formed without considering underlying pattern heights, then the manufacturing process is simple, but the anode layer surface becomes uneven causing poor chromatic aberration symmetry
Solution Approach 1:
The planarization layer is divided into a first part covering the functional pattern and a second part not covering the functional pattern. This segmentation allows each part to have different thicknesses, enabling the first part to compensate for the height of the functional pattern and achieve a flat anode layer surface, while maintaining structural complexity only where necessary.
Solution Approach 2:
The planarization layer is designed with non-uniform thickness distribution: the first part has a greater thickness to fill the space above the functional pattern, while the second part has a smaller thickness. This local quality variation ensures that the top surface of the planarization layer is substantially flat, providing a uniform base for the anode layer without adding unnecessary complexity throughout the entire structure.
2Manufacturing precision
If the planarization layer uniformly covers all areas, then the structure is simple, but the chromatic aberration symmetry deteriorates due to surface unevenness
Solution Approach 1:
The planarization layer is segmented into distinct regions (first part and second part) with different coverage areas and thicknesses. The first part is positioned to cover the functional pattern and provide height compensation, while the second part covers non-functional areas with reduced thickness. This segmentation achieves chromatic aberration symmetry by ensuring uniform anode layer formation without requiring complex multi-layer structures.
3Manufacturing precision
If compensation functional pattern is added to address surface unevenness, then the flatness improves, but the manufacturing process becomes more complex
Solution Approach 1:
The compensation functional pattern is formed in advance during the existing manufacturing process sequence, specifically after forming the functional pattern and before forming the planarization layer. This preliminary action creates the necessary height variations that the planarization layer will subsequently compensate for, achieving flat surface without requiring additional post-processing steps or complex manufacturing operations.
Data Source
AI summary
A display substrate, a method of forming the display substrate and a display device are provided. The display substrate includes a base substrate, a functional pattern arranged at a side of the base substrate and a planarization layer arranged at a side of the functional pattern away from the base substrate. The planarization layer includes a first part and a second part, an orthographic projection of the first part to the base substrate coincides with an orthographic projection of the functional pattern to the base substrate, and an orthographic projection of the second part to the base substrate does not overlap the orthographic projection of the functional pattern to the base substrate.