Flexible Display Window Module Groove Stress Distribution
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Solution Overview
Problem
Flexible electronic devices face a trade-off between durability and flexibility, as structures enhancing durability compromise the device's ability to fold and bend, while those improving flexibility may weaken its impact resistance.
Innovation Solution
A display device with a window module featuring a base substrate with specific groove patterns and cover layers, optimized for refractive index, Poisson's ratio, Young's modulus, and volumetric strain, which reduces repulsive forces during folding and enhances impact resistance by distributing stress effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a structure for enhancing durability is applied to the flexible electronic device, then impact resistance is improved, but flexibility is deteriorated
Solution Approach 1:
The base substrate is divided into multiple regions with different groove configurations. The first region has first grooves and the second region has second grooves, allowing different parts of the substrate to have different mechanical properties - enhancing impact resistance in certain areas while maintaining flexibility in others.
Solution Approach 2:
Different regions of the base substrate are given different local structures through the groove patterns. The first and second grooves create localized structural variations that provide enhanced durability where needed while preserving overall flexibility for folding operations.
2Adaptability or versatility
If a structure for improving flexibility is applied to the flexible electronic device, then foldability is improved, but impact resistance is weakened
Solution Approach 1:
The substrate structure is segmented into regions with different groove patterns, allowing the device to have flexible regions for folding and reinforced regions for impact resistance, resolving the trade-off between these two properties.
Solution Approach 2:
The base substrate combines different structural elements (first grooves and second grooves with different configurations) to create a composite-like structure that simultaneously provides flexibility and impact resistance, similar to how composite materials combine different material properties.
3Reliability
If deep grooves are formed in the base substrate to reduce repulsive forces during folding, then folding reliability is improved, but structural integrity may be compromised
Solution Approach 1:
The grooves are strategically positioned in specific regions (first and second regions) rather than uniformly distributed. This localized groove placement reduces repulsive forces during folding while maintaining structural integrity in critical areas by preserving material density where needed.
Solution Approach 2:
Instead of forming grooves throughout the entire substrate, the invention applies grooves partially to specific regions. This partial action is sufficient to achieve the desired reduction in repulsive forces during folding while avoiding excessive modification that would compromise overall structural integrity.
Data Source
AI summary
A display device includes a display module including a folding area and a window module disposed on the display module. The window module includes a base substrate including a first surface on which a plurality of first grooves are formed and a second surface on which a plurality of second grooves are formed, a first cover layer disposed on the first surface of the base substrate and filled in the plurality of first grooves, and a second cover layer disposed on the second surface of the base substrate and filled in the plurality of second grooves. Depths of the plurality of first grooves and the plurality of second grooves are greater than or equal to half of a distance between the first surface and the second surface.