Flexible Display Pixel Pitch Variation for Bending Stress
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Solution Overview
Problem
Flexible display devices face mechanical defects and cracks due to their bent shape, as existing technologies lack sufficient resistance in bending regions.
Innovation Solution
A flexible display device design featuring a substrate with distinct foldable and non-foldable regions, where pixels in the bending region are spaced farther apart than those in the non-bending region, allowing for the removal of insulating layers to reduce stress and enhance bending reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixels are densely arranged in the bending region, then display resolution is improved, but mechanical stress and crack resistance deteriorate
Solution Approach 1:
The patent applies different pixel pitch values to different regions of the display device. Specifically, the bending region uses a first pixel pitch (greater distance between adjacent pixels) while the non-bending region uses a second pixel pitch (smaller distance between adjacent pixels). This local differentiation allows the bending region to have reduced mechanical stress while the non-bending region maintains high display resolution.
2Reliability
If insulating layers are removed in the bending region, then stress intensity is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the substrate into distinct bending and non-bending regions, and further segments the insulating layer removal process to apply only to the bending region. This selective removal is achieved through region-specific patterning processes that treat different areas differently, reducing overall stress while maintaining manufacturing feasibility through controlled process differentiation.
3Ease of manufacture
If uniform pixel spacing is used across the entire substrate, then manufacturing simplicity is maintained, but bending region stress concentration increases
Solution Approach 1:
The patent implements non-uniform pixel spacing by defining different pixel pitch values for different regions. The bending region uses a larger pixel pitch to reduce stress concentration, while the non-bending region uses a smaller pixel pitch for optimal display quality. This local quality differentiation resolves the conflict between manufacturing simplicity and stress reduction.
Data Source
AI summary
A flexible display device includes a substrate, a plurality of first pixels, and a plurality of second pixels. The substrate includes a foldable bending region and a non-foldable non-bending region. Each first pixel is disposed on the bending region. Each first pixel is spaced apart from an adjacent first pixel by a first distance. Each second pixel is disposed on the non-bending region. Each second pixel is spaced apart from an adjacent second pixel by a second distance. The first distance is greater than the second distance.