OLED Display Substrate Anode Layout for Color Shift Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In OLED display panels, the overlap of signal lines under the anode leads to unevenness in the anode and light-emitting layer, causing a color shift phenomenon when viewed from different angles.
Innovation Solution
The display substrate design includes sub-pixel groups with anodes that overlap with two adjacent signal line groups, forming protrusions that reduce or eliminate the asymmetry of light emission, thereby alleviating the color shift issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal lines are arranged under the anode to achieve high-resolution pixel arrangement, then pixel density and resolution are improved, but the anode and light-emitting layer become uneven, causing color shift phenomenon
Solution Approach 1:
The anode is designed with an asymmetric structure where the first main portion has a larger size in the first direction (parallel to signal lines) than in the second direction (perpendicular to signal lines). This asymmetric geometry allows the anode to overlap with two adjacent signal line groups, creating protrusions that compensate for the unevenness caused by signal line placement, thereby reducing color shift while maintaining high resolution
Solution Approach 2:
Different portions of the anode are designed with different sizes and shapes to address local variations in the underlying structure. The first main portion is enlarged in the first direction to overlap with signal lines, while the overall anode shape is optimized to maintain uniform light emission. This local adaptation allows the anode to accommodate signal lines without compromising overall uniformity
2Stability of the object's composition
If the anode size is increased to overlap with signal lines, then color shift is reduced, but the area of the anode increases
Solution Approach 1:
The anode is not uniformly enlarged but rather has specific portions (the first main portion) enlarged in the first direction to overlap with signal lines. This localized enlargement achieves the necessary overlap for uniform light emission without proportionally increasing the total anode area, thus balancing uniformity requirements with area constraints
Solution Approach 2:
The anode geometry is optimized by changing its dimensional characteristics - making it larger in the first direction (parallel to signal lines) while controlling its size in the second direction (perpendicular to signal lines). This anisotropic scaling allows the anode to overlap with signal lines effectively while minimizing the overall area increase
Data Source
AI summary
A display substrate and a display device. The display substrate includes a plurality of sub-pixel groups and a plurality of signal line groups. The plurality of signal line groups are arranged along a first direction and are spaced apart from each other, each of the signal line groups includes at least one signal line, and the signal line extends along a second direction intersecting the first direction. Each of the sub-pixel groups includes a first sub-pixel, and the first sub-pixel includes a first anode and a first effective light-emitting region, the first anode includes a first main portion, and the first main portion at least partially overlaps with the first effective light-emitting region, a size of the first main portion in the first direction is larger than a size of the first main portion in the second direction, and the first anode overlaps with two adjacent signal line groups.