Flexible Window Member Impact Absorbing Layer Design
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Solution Overview
Problem
Flexible electronic devices face a trade-off between flexibility and impact resistance, as external members required to be warped, bent, or folded often compromise on reliability against external impacts.
Innovation Solution
A window member design incorporating a first base member with a first impact absorbing layer and hard coating layers on both surfaces, along with a second base member and adhesive member, to enhance flexibility and impact resistance, with specific thickness ratios and materials like polyimide and polyurethane used to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external members are made flexible to be warped, bent, or folded, then flexibility is improved, but impact resistance deteriorates
Solution Approach 1:
The window member employs a composite structure consisting of a base member, impact absorbing layer, and hard coating layer. This multi-material composition allows the window member to simultaneously achieve flexibility from the base member and impact resistance from the combined structure, resolving the contradiction between flexibility and impact resistance.
Solution Approach 2:
Different layers of the window member are designed with distinct local properties: the base member provides flexibility, the impact absorbing layer provides energy absorption capability, and the hard coating layer provides surface hardness. This local differentiation allows each layer to optimize its specific function while contributing to overall performance.
2Strength
If the thickness of the impact absorbing layer is increased to improve impact resistance, then impact resistance is improved, but flexibility deteriorates
Solution Approach 1:
The patent specifies that the thickness ratio of the impact absorbing layer to the base member is controlled within 0.1 to 0.5. This parameter optimization ensures that the impact absorbing layer is thick enough to provide adequate protection while remaining thin enough to maintain the flexibility of the overall window member structure.
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 provides improved flexibility while maintaining robust impact resistance, effectively protecting display modules from external impacts and ensuring the device remains functional when folded or rolled.
Implementation Method 1
a first impact absorbing layer disposed on one surface of the first base member and having a storage modulus less than a storage modulus of the first base member
Data Source
AI summary
A window member according to an embodiment of the inventive concept includes a first base member having a first thickness, a first impact absorbing layer disposed on one surface of the first base member and having a storage modulus less than that of the first base member and a second thickness, a first hard coating layer disposed on the first impact absorbing layer, and a second hard coating layer disposed on the other surface that is opposite to the one surface of the first base member. Here, a ratio of the second thickness to the first thickness is equal to or greater than about 1.0 and equal to or less than about 1.67. The first base member is bent with respect to a bending axis extending in one direction.