Display Substrate Anode Flatness via Planarization Compensation
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Solution Overview
Problem
High pixel density in displays makes it challenging to ensure the flatness of anode patterns under pixel openings, affecting display quality and color shift parameters.
Innovation Solution
A display substrate design featuring a base substrate with data lines, sub-pixels, and a planarization compensation pattern that overlaps with data lines and anode patterns, compensating for level differences and improving flatness by arranging planarization and power supply lines in specific configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased to improve display quality, then display resolution is improved, but the flatness of anode patterns under pixel openings deteriorates
Solution Approach 1:
A planarization compensation pattern is introduced as an intermediary structure between the data line and the anode pattern. This compensation pattern has a specific shape and position that compensates for the level difference created by the data line, thereby maintaining the flatness of the anode pattern even when pixel density is increased
Solution Approach 2:
The planarization compensation pattern is locally positioned at the specific location where the data line intersects with the anode pattern area. By applying local quality adjustment only at this critical location rather than throughout the entire structure, the flatness issue is addressed precisely where it occurs without affecting other areas
2Manufacturing precision
If planarization compensation pattern is added to improve anode pattern flatness, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The planarization compensation pattern is merged with the existing data line structure and anode pattern layout. The compensation pattern is positioned to overlap with both the data line and anode pattern, combining multiple functions into a single integrated structure rather than adding a completely separate element
Solution Approach 2:
The planarization compensation pattern serves multiple functions: it compensates for level differences caused by the data line, maintains the flatness of the anode pattern, and integrates with the existing pixel structure. This multi-functionality reduces the need for additional separate structures
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes: a base substrate, a plurality of data lines arranged on the base substrate, and a plurality of first sub-pixels arranged on the base substrate; the first sub-pixel includes: a first pixel opening, an orthographic projection of the first pixel opening on the base substrate partially overlaps an orthographic projection of a target data line among the plurality of data lines on the base substrate; a planarization compensation pattern, at least part of the planarization compensation pattern extends along a first direction, an orthographic projection of the planarization compensation pattern on the base substrate at least partially overlaps an orthographic projection of the first pixel opening on the base substrate, the planarization compensation pattern and the target data line are arranged along a second direction, and the second direction intersects the first direction.