Flexible Display Support Member Stress Redistribution
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Solution Overview
Problem
Rollable display devices face issues with cracking and stress accumulation during winding and unwinding due to sharp changes in the neutral plane, leading to potential damage to components with high hardness and low malleability.
Innovation Solution
Adjusting the modulus value and thickness of specific layers in the display panel to optimize the neutral plane position, and using a support member to shift tensile stress to compressive stress in vulnerable areas, thereby reducing stress concentrations and crack formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display device is wound into a rolled state, then the display device can be compacted and stored, but tensile stress is applied to vulnerable areas causing cracks
Solution Approach 1:
The patent changes the physical parameters of the neutral plane by adjusting the modulus value and thickness of specific layers in the display panel. This parameter modification allows the neutral plane to be positioned optimally to reduce tensile stress on vulnerable components during winding, thereby preventing cracks while maintaining rollability.
Solution Approach 2:
The patent applies beforehand cushioning by designing the display panel structure with optimized layer properties before the winding operation occurs. The neutral plane is pre-positioned through structural design to provide stress relief and protection against crack formation that would occur during subsequent winding operations.
2Reliability
If the neutral plane position is optimized to reduce stress, then crack resistance improves, but the structure complexity increases
Solution Approach 1:
The patent applies local quality by modifying specific layers at specific locations within the display panel structure. Rather than redesigning the entire panel, only certain layers have their modulus or thickness adjusted in specific regions to optimize the neutral plane position and reduce stress concentration where it is most needed.
3Manufacturing precision
If components with high hardness and low malleability are used, then manufacturing precision improves, but stress concentration increases during winding
Solution Approach 1:
The patent changes the mechanical parameters (modulus and thickness) of specific layers to compensate for the brittleness of high-hardness components. By adjusting these parameters, the neutral plane position is optimized to reduce stress concentration on hard, low-malleability components during winding operations.
Data Source
AI summary
A flexible display panel is disclosed. The flexible display panel includes a substrate and a pixel unit on a first surface of the substrate. An encapsulation layer is on the first surface of the substrate and covers the pixel unit. A support member is on a second surface of the substrate that is opposite the first surface. The support member overlaps an edge of the encapsulation layer. The support member reduces stress applied to areas of the flexible display panel that are vulnerable to cracking during bending of the flexible display panel.