Segmented Protection Film for Flexible Display Bending Reliability
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Solution Overview
Problem
Flexible display panels face issues such as shifting neutral layers, Moire abnormalities, and adhesion problems due to repeated bending, which affect their performance and lifespan.
Innovation Solution
A protection film with a main portion and at least one cover, where the cover is partially connected but not fixed to the main portion, providing a bending guiding function and stress release path, made from materials like stainless steel or titanium alloys, with a thickness ranging from 100 μm to 200 μm, and a ratio of cover to main portion thickness from 1/10 to 1/2, to enhance bending resistance and prevent light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the protection film is made bendable to enable flexible display functionality, then the display panel becomes portable and rollable, but repeated bending causes neutral layer shifting, Moire abnormalities, and adhesion problems
Solution Approach 1:
The protection film is divided into a main portion and at least one cover that is partially connected but not fixed to the main portion. This segmentation allows the cover to move independently during bending, providing a stress release path and preventing the neutral layer shifting and Moire abnormalities that occur in fully fixed structures
Solution Approach 2:
The non-fixed connection between the cover and main portion creates a dynamic structure that can adapt to bending stresses. The cover can shift position relative to the main portion during bending operations, allowing the structure to accommodate repeated flexing without failure, thereby improving bending reliability
2Stability of the object's composition
If the cover is fully fixed to the main portion to maintain structural stability, then structural integrity is improved, but bending flexibility and stress release capability are reduced
Solution Approach 1:
The connection between the cover and main portion is made non-fixed only at specific edge regions while maintaining connection at other areas. This local differentiation allows the structure to remain stable where needed while providing flexibility and stress release capability at the non-fixed edges during bending operations
3Ease of manufacture
If the protection film structure is simplified to reduce manufacturing complexity, then manufacturing cost is reduced, but bending resistance and light leakage prevention capabilities are compromised
Solution Approach 1:
The protection film is segmented into a main portion and cover elements that can be manufactured separately and then assembled. This segmentation allows each component to be optimized independently for bending resistance and light leakage prevention, while the overall manufacturing process remains relatively simple and cost-effective
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves bending reliability, prevents shifting of the neutral layer, enhances bonding, and reduces Moire abnormalities, while maintaining structural stability and preventing light transmission issues, thus extending the service life of flexible display panels.
Implementation Method 1
laser engraving the base material layer to form the first edge
Data Source
AI summary
A protection film, a method of manufacturing the protection film are provides, a display panel and a display device. The protection film includes a main portion and at least one cover surrounded by the main portion. The cover is at least partially connected to the main portion. At least part of an edge of the cover is a first edge, and the first edge and the main portion are not fixed.