Display Substrate Boundary Sub-pixel Area Gradient
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Solution Overview
Problem
Display products with high screen-to-body ratios, such as bezel-less and wearable devices, exhibit a saw-tooth pattern due to the mismatch between the circular-arc shaped boundary and rectangular sub-pixels, degrading user experience by causing sudden luminance changes at the boundary.
Innovation Solution
A display substrate with sub-pixels arranged in an array, where first sub-pixels closer to the non-straight boundary have smaller areas than second sub-pixels, decreasing gradually from the center to the boundary to reduce luminance changes and blur the saw-tooth pattern, without requiring adjustments to data lines, scan lines, or the black matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub-pixels are arranged with uniform size in a display area with circular-arc boundary, then manufacturing is simple, but saw-tooth pattern appears at the boundary
Solution Approach 1:
The patent applies local quality by differentiating sub-pixel sizes based on their position relative to the display boundary. Sub-pixels closer to the circular-arc boundary are made smaller than those in the center, creating a gradient size distribution that matches the curved boundary geometry and eliminates the saw-tooth pattern while maintaining manufacturing feasibility.
2Object-affected harmful factors
If sub-pixel size varies to match circular-arc boundary, then saw-tooth pattern is eliminated, but manufacturing complexity increases
Solution Approach 1:
The patent segments the display area into different zones based on distance from the boundary, creating multiple groups of sub-pixels with different sizes. This segmentation approach allows systematic control of sub-pixel dimensions to match the curved boundary while maintaining regular manufacturing processes through standardized size categories.
3Object-affected harmful factors
If first sub-pixels near boundary are made smaller, then luminance change is reduced, but display area is decreased
Solution Approach 1:
The patent applies partial action by making only the boundary-adjacent sub-pixels smaller while maintaining full size for central sub-pixels. This selective size reduction minimizes the impact on total display area while sufficiently reducing luminance changes at the boundary to eliminate the saw-tooth pattern, achieving optimal balance between boundary quality and overall display area.
Data Source
AI summary
A display substrate, a manufacturing method of the display substrate and a display device are provided. The display substrate includes a plurality of sub-pixels arranged in an array in a display area. The display area includes a boundary extending in non-straight line. The plurality of sub-pixels arranged in the array include a plurality of first sub-pixels whose distances to the boundary extending in non-straight line are less than a preset threshold and a plurality of second sub-pixels other than the plurality of first sub-pixels, where at least one of the first sub-pixels is smaller in area than each of the second sub-pixels.