Flexible OLED Bending Portion Stress Relief via Support Member
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Solution Overview
Problem
Current foldable display products face stress relief challenges during folding and unfolding, leading to potential damage as the bendable radius decreases.
Innovation Solution
A flexible OLED display device design featuring a flexible display panel with an active area, extension portion, and bending portion, supported by a support member with strategically set distances and coated with curable adhesive to alleviate stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the bendable radius is reduced to achieve smaller foldable display products, then the flexibility and compactness are improved, but the stress concentration at the bending portion increases causing damage to the display product
Solution Approach 1:
A support member is introduced as an intermediary component between the active area and extension portion. This support member specifically positioned at the bending portion serves as a mediator to distribute and relieve stress concentration during folding and unfolding, preventing direct stress on the display product while enabling small bendable radius
Solution Approach 2:
The support member is strategically positioned only at the bending portion where stress concentration occurs, rather than throughout the entire display panel. This localized approach provides targeted stress relief at the critical bending area while maintaining the overall flexibility and compactness of the foldable display product
2Reliability
If the support member is positioned closer to the bending portion to reduce stress, then the stress relief is improved, but the distance between support member and bending portion becomes too small causing potential interference
Solution Approach 1:
The first distance is pre-set to a specific range (0.2mm-1mm) during the design phase, before the product is manufactured or used. This preliminary determination of the optimal distance ensures both stress relief effectiveness and avoidance of interference, eliminating the need for complex real-time adjustment during operation
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 relieves stress concentration at the bending portion, preventing damage and disconnection of wires, while ensuring the display device's flexibility and durability.
Implementation Method 1
a side of the bending portion facing away from the support member is coated with a curable adhesive, the curable adhesive exceeds the bending portion and at least partially covers the extension portion
Data Source
AI summary
A flexible OLED display device includes a flexible display panel and a support member. The flexible display panel includes an active area, an extension portion and a bending portion connecting the active area and the extension portion. The support member is located between the active area and the extension portion. The active area, the support member and the extension portion are stacked, and a first distance is set between the support member and the bending portion in an extending direction parallel to the extension portion. The bending portion is substantially of a semicircular shape, and an inner radius of the semicircular shape is equal to a sum of a half of a thickness of the support member and a third distance between an upper surface of the support member and a lower surface of the active area, and the third distance is less than the thickness of the support member.