Foldable OLED Display Panel Net-Shaped Spacer Stress Management
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Solution Overview
Problem
Existing foldable OLED display panels experience unevenly distributed stress in the bending region, leading to degradation of display components due to fixed bending axes and uniform spacer distribution, which affects the reliability of the panel.
Innovation Solution
A foldable OLED display panel design with a bending region and a non-bending region, where spacers in the bending region are distributed in a net shape to surround subpixels, providing enhanced support and gap formation, while spacers in the non-bending region are evenly distributed to correspond to subpixels, ensuring uniform stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform spacers are distributed evenly across the entire display area, then manufacturing is simplified, but stress distribution in the bending region becomes uneven causing component degradation
Solution Approach 1:
The patent applies different spacer distribution patterns to different regions: the bending region uses a net-shaped pattern with higher density spacers arranged in rows and columns, while the non-bending region uses uniform distribution. This local differentiation ensures that each region receives appropriate stress management without compromising manufacturing simplicity.
Solution Approach 2:
The display area is segmented into bending and non-bending regions, with distinct spacer distribution strategies applied to each. The bending region is further divided into multiple rows and columns of spacers, creating a segmented net structure that provides localized stress support where needed most.
2Reliability
If spacers are densely distributed in the bending region, then stress distribution improves, but device complexity increases
Solution Approach 1:
The net-shaped spacer pattern is applied specifically to the bending region where stress concentration occurs, while the non-bending region maintains simple uniform distribution. This localized approach improves stress distribution without unnecessarily complicating the entire device structure.
3Device complexity
If fixed bending axes are used, then device structure is simplified, but stress concentration occurs at specific locations
Solution Approach 1:
The patent introduces region-specific spacer patterns that adapt to the stress distribution caused by fixed bending axes. The net-shaped pattern in the bending region compensates for stress concentration at specific locations, maintaining reliability without requiring complex multi-axis configurations.
Data Source
AI summary
A foldable organic light emitting diode (OLED) display panel includes a bending region and a non-bending region, and includes a plurality of subpixels, formed in the bending region and the non-bending region, a part of or all of the plurality of subpixels having a self-illumination property; and first spacers, configured to provide support and form gaps, wherein the first spacers are disposed in the bending region and distributed in a shape of net, and surrounds the plurality of subpixels. The display panel can enhance an ability of the subpixels in the bending region to endure stress throughout a bending process and ensure reliability of the display panel.