Stretchable Display Substrate with Through Holes for Edge Distortion Control
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Solution Overview
Problem
Existing OLED flexible display apparatuses struggle to accommodate the flexible requirements of display substrates in complex applications such as head-mounted displays, leading to edge distortion issues during observation.
Innovation Solution
A display substrate with structural units featuring through holes arranged in an array, allowing for stretchability and differential stretching in central and edge regions, which are then attached to an arc-shaped backplane to achieve a small pixel pitch in the edge region and a large pixel pitch in the central region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display substrate uses a conventional rigid structure, then the manufacturing process is simple, but the display substrate cannot accommodate complex flexible requirements such as head-mounted displays
Solution Approach 1:
The display substrate is divided into multiple structural units, each containing pixel islands and through holes arranged in specific patterns. This segmentation allows different regions to stretch independently, enabling the substrate to accommodate complex curved configurations while maintaining display functionality.
Solution Approach 2:
The patent applies different through hole arrangements and pixel island configurations to different regions (central region vs. edge region) of the display substrate. This local differentiation enables differential stretching in various areas, allowing the substrate to adapt to curved surfaces without uniform distortion.
2Manufacturing precision
If the display substrate is stretched uniformly across all regions, then the manufacturing process is simple, but edge distortion occurs during observation
Solution Approach 1:
The patent designs different through hole patterns for central and edge regions, allowing each region to stretch at different rates. The edge region with its specific through hole arrangement stretches less than the central region, compensating for the natural stretching that occurs when mounting on curved surfaces and preventing edge distortion.
Solution Approach 2:
The through holes are arranged asymmetrically in different regions of the display substrate. The edge region has through holes positioned to create a smaller pixel pitch after stretching, while the central region maintains a larger pixel pitch. This asymmetric design compensates for the non-uniform stretching that occurs on curved surfaces.
3Manufacturing precision
If the display substrate uses a conventional pixel arrangement, then the manufacturing process is simple, but the pixel pitch cannot be optimized for different regions
Solution Approach 1:
The display substrate is segmented into multiple structural units with different through hole configurations. Each segment can be independently designed to achieve optimal pixel pitch for its specific location, allowing precise control over pixel pitch in both central and edge regions.
Solution Approach 2:
The patent changes the geometric parameters of through holes (position, size, arrangement) between different regions. By adjusting these parameters, the pixel pitch is optimized for each region's specific requirements, achieving smaller pixel pitch in edge regions and larger pixel pitch in central regions.
Data Source
AI summary
A display substrate has a central region and an edge region, and includes a plurality of structural units arranged in an array in the central region and the edge region; each structural unit is provided with a plurality of through holes, and divided by the plurality of through holes into a pixel island for displaying and a bridge portion for transmitting signals; the plurality of through holes are arranged around the pixel island; a part of the bridge portion is positioned between the pixel island and the through holes, and another part of the bridge portion is positioned between adjacent through holes; and a pixel pitch between adjacent pixel islands in the structural units in the edge region is equal to a pixel pitch between adjacent pixel islands in the structural units in the central region.