Stretchable Display Bridge Structure Warping Prevention
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Solution Overview
Problem
Stretchable display panels experience warping due to deformation of stretch bridges during stretching, affecting display quality.
Innovation Solution
The design includes a stretchable substrate with island structures and bridge structures, where the bridge structures have a maximum thickness greater than or equal to their maximum width, reducing the likelihood of longitudinal bending and warping by requiring more work to bend them, and the use of thickening layers to enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stretch bridge is made thin and flexible to enable stretching, then the stretchability is improved, but the bridge structure becomes prone to bending and warping in the light-emitting direction
Solution Approach 1:
The bridge structure is designed with non-uniform thickness distribution, featuring a thicker middle portion and thinner edge portions. This local quality variation allows the bridge to maintain structural stability in the light-emitting direction while preserving flexibility for stretching. The thicker middle section resists bending forces, preventing warping, while the overall thin profile enables stretchability.
Solution Approach 2:
The invention addresses the warping problem by controlling the thickness dimension (vertical dimension perpendicular to the substrate) of the bridge structure. By making the maximum thickness H1 greater than the maximum width W1 in specific regions, the bridge gains resistance to bending in the light-emitting direction while maintaining flexibility for stretching in the plane direction.
2Stability of the object's composition
If the bridge structure is made thicker to prevent warping, then the structural stability is improved, but the flexibility and stretchability deteriorate
Solution Approach 1:
Rather than uniformly thickening the entire bridge structure, the invention applies localized thickening only in the middle portion of the bridge where structural support is most needed. This allows the bridge to resist warping in the light-emitting direction while keeping the edge portions thin to maintain flexibility and stretchability.
Solution Approach 2:
The invention optimizes the geometric parameters of the bridge structure, specifically setting the maximum thickness H1 to be greater than the maximum width W1 in the middle portion. This parameter configuration provides sufficient rigidity to prevent warping while the overall thin profile and tapered edges preserve the stretchability required for flexible display applications.
Data Source
AI summary
A stretchable display panel and a stretchable display device are provided. The stretchable display panel includes a stretchable substrate including island structures and bridge structures, and two adjacent island structures are connected by the bridge structure. The island structure includes a first carrier substrate and a first display layer including a pixel unit, and the bridge structure comprises a second carrier substrate and a second display layer including a signal line. The bridge structure has a first cross section perpendicular to a plane of the second carrier substrate and perpendicular to an extending direction of the bridge structure. A maximum width W1 of the first cross section in a first direction is smaller than or equal to maximum thickness H1 of the bridge structure in the direction perpendicular to the plane, and the first direction is parallel to the plane and perpendicular to the extending direction.