Protection Film Cavity Layout for Flexible Display Crack Resistance
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Solution Overview
Problem
Flexible display panels face challenges with crack generation and propagation due to stress concentrations at the L-shaped regions during bending, leading to potential defects and reduced reliability.
Innovation Solution
Incorporating a cavity in the protection film at the L-shaped regions of the display panel, which reduces stress concentrations and prevents crack formation by creating a deflection area between the antireflection layer and the bending portion, thereby enhancing the panel's flexibility and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is bent to achieve flexibility, then the display panel can be transformed and adapted to different shapes, but cracks may generate and spread at the L-shaped regions due to stress concentration
Solution Approach 1:
The protection film is segmented by introducing a cavity that divides it into multiple regions (first region, second region, and third region). This segmentation allows each region to independently manage stress during bending, preventing stress concentration at the L-shaped border portion and reducing crack generation while maintaining flexibility
Solution Approach 2:
The cavity creates regions with different structural properties: the first region (adjacent to display area) maintains full protection, the third region (at the L-shaped border) has reduced material to accommodate bending stress, and the second region connects them. This local quality variation allows the protection film to provide both protection and flexibility at appropriate locations
2Ease of manufacture
If the display panel structure is simplified without the cavity, then the manufacturing process is easier and the structure is simpler, but stress concentration occurs at the L-shaped border portion causing cracks
Solution Approach 1:
The cavity structure is pre-designed and formed in the protection film before the display panel undergoes bending operations. This preliminary action of creating the cavity prevents stress concentration from occurring in the first place, rather than attempting to repair or mitigate cracks after they form, thereby maintaining both manufacturing simplicity and reliability
Data Source
AI summary
A display device includes a substrate and a protection film disposed on a rear side of the substrate. The substrate includes a first portion including a display area and having a first width, and a second portion extending from the first portion and having a second width narrower than the first width. The protection film includes a cavity at a border portion of the first portion and the second portion of the substrate.