Flexible OLED Panel Optical Film Protrusions for Bend Stress Relief
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Solution Overview
Problem
OLED flexible display screens face issues with stress concentration at the edges of bendable regions, leading to cracks and poor display effects due to excessive bending stress.
Innovation Solution
Incorporating protrusions on the optical structure film layer in the display panel, specifically designed to avoid overlap with the display device layer, disperses stress concentration and enhances bending durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the optical structure film layer is made flush with the display device layer edge, then the manufacturing process is simplified, but stress concentration occurs at the bendable region edges leading to cracks
Solution Approach 1:
The optical structure film layer is segmented relative to the display device layer by extending beyond the display device layer edge to form a protrusion. This segmentation allows the optical film to be separated from the stress concentration zone at the bendable region edge, reducing stress on the display device layer while maintaining manufacturing simplicity.
Solution Approach 2:
The optical structure film layer extends in the lateral dimension beyond the display device layer edge, creating a protrusion that projects outward. This dimensional extension moves the optical film's edge away from the critical bending stress zone, allowing stress to be distributed to the protrusion region instead of concentrating at the display device layer edge.
2Reliability
If the optical structure film layer extends beyond the display device layer edge, then stress concentration is reduced and bending durability is improved, but the device complexity increases
Solution Approach 1:
The optical structure film layer is designed with local quality variation by extending only at specific regions to form protrusions, rather than uniformly throughout. This localized extension provides stress relief at critical bendable regions while maintaining a relatively simple overall structure and avoiding unnecessary complexity in non-critical areas.
3Reliability
If protrusions are added to the optical structure film layer, then stress is dispersed and cracks are prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The protrusion structure is designed with predetermined dimensions and positions relative to the display device layer. By establishing these geometric relationships in advance during the design phase, the manufacturing process can follow standardized procedures without requiring high-precision real-time alignment, thus reducing manufacturing precision requirements while still achieving stress dispersion and crack prevention.
Data Source
AI summary
A display panel and a preparation method therefor, and a display apparatus are provided. The display panel has at least one bendable region, and the display panel includes a display device layer and an optical structure film layer disposed on the display device layer, an edge of at least a part of the optical structure film layer in a direction along a bending axis of the at least one bendable region is provided with a protrusion, and vertical projections of the protrusion and the display device layer on the optical structure film layer are not overlapped, and at least a part of the protrusion is located in the at least one bendable region.