Foldable Display Device With Segmented Bending Areas
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Solution Overview
Problem
Foldable display devices face challenges in reducing stress on bending areas when folded, leading to potential cracking and signal interference due to overlapping flexible printed circuit boards.
Innovation Solution
A foldable display device design featuring a flexible substrate with separate bending areas that do not overlap with the folding line, ensuring reduced stress concentration and minimizing signal interference by positioning flexible printed circuit boards to avoid overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible substrate is folded along the display area, then the usability of space for storing the display device is improved, but stress is concentrated on the bending area causing cracking
Solution Approach 1:
The bending area is divided into multiple separate bending areas that extend from different sides of the bezel area. These separated bending areas prevent stress concentration by distributing the folding stress across multiple independent regions rather than a single continuous bending zone, thereby improving durability while maintaining foldability
2Adaptability or versatility
If the flexible substrate is folded, then portability is improved, but signal interference occurs due to overlapping of flexible printed circuit board
Solution Approach 1:
The flexible printed circuit board is divided into multiple separate regions corresponding to the separated bending areas. This segmentation ensures that when the display device is folded, the circuit board regions do not overlap with each other, preventing signal interference while maintaining the portability benefits of folding
3Length of moving object
If a single continuous bending area is used to implement narrow bezel, then the bezel width is reduced, but stress concentration causes components to crack
Solution Approach 1:
The continuous bending area is segmented into multiple separate bending areas extending from different sides of the bezel. This segmentation maintains the narrow bezel appearance while distributing mechanical stress across multiple discrete regions, preventing stress concentration and component cracking
4Device complexity
If the folding line overlaps with the bending area, then the folding structure is simplified, but stress concentration increases
Solution Approach 1:
The bending area is segmented into multiple separate regions positioned such that the folding line does not overlap with any single bending area. This arrangement simplifies the folding structure by maintaining a clear folding line while distributing stress across multiple separated bending zones, reducing stress concentration
Data Source
AI summary
Provided is a foldable display device. The foldable display device includes a flexible substrate which includes a display area, a bezel area enclosing the display area, and a plurality of bending areas extending from one side of the bezel area; and a display unit disposed in the display area, in which the plurality of bending areas is separated from each other. Therefore, even though the foldable display device is folded, the stress concentrated due to the bending and/or folding overlapping in the bending area may be reduced.