Variable Density Cushion Layer for Flexible Display Impact Resistance
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Solution Overview
Problem
Flexible display devices face challenges in achieving uniform impact resistance across bending and non-bending areas, which affects their durability and functionality when subjected to external forces.
Innovation Solution
A flexible display device design incorporating a cushion layer with varying densities in different areas and an electromagnetic wave shielding layer, along with adhesive and light shielding layers, to absorb impacts and maintain uniform impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform cushion layer is used across the display module, then the manufacturing process is simple, but the impact resistance is non-uniform between bending and non-bending areas
Solution Approach 1:
The cushion layer is designed with different densities in different regions: a first density in the non-bending area and a second density in the bending area. This local differentiation ensures that each region has the appropriate cushioning characteristics for its specific functional requirements, achieving uniform impact resistance across the entire display module.
Solution Approach 2:
The density parameter of the cushion layer material is changed between different regions. By adjusting the density from a first value in the non-bending area to a second value in the bending area, the cushioning performance is optimized for each region's mechanical characteristics and impact resistance requirements.
2Reliability
If the cushion layer density is increased to improve impact resistance, then the protective effect is enhanced, but the touch sensitivity may be reduced
Solution Approach 1:
Different regions of the cushion layer have different densities tailored to their specific functions: the non-bending area uses a lower density to maintain touch sensitivity, while the bending area uses a higher density to provide adequate impact protection. This resolves the contradiction by making the cushioning properties location-specific rather than uniform.
Solution Approach 2:
The density parameter of the cushion layer is varied spatially across the display module. By controlling the density to be lower in the non-bending area and higher in the bending area, the system achieves both touch sensitivity where needed and impact resistance where required, eliminating the trade-off between these two properties.
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 design effectively absorbs impacts and maintains uniform impact resistance across all areas, enhancing the device's durability and functionality, as demonstrated by the pen drop experiment results.
Implementation Method 1
a cushion layer disposed on a rear surface of the display module, wherein the cushion layer has a first density in the first non-bending area, and a second density in the first bending area
Data Source
AI summary
A flexible display device may include a display module including a first non-bending area and a first bending area adjacent to the first non-bending area, and a cushion layer disposed on a rear surface of the display module, wherein the cushion layer has a first density in the first non-bending area and a second density in the first bending area, and the first density is lower than the second density.