Stretchable Display Panel Bridge Width Variation
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Solution Overview
Problem
Conventional stretchable display panels face issues with wires breaking at the edge of the display area due to local stress during stretching, leading to failure of the display substrate, especially at transition areas with island and bridge structures.
Innovation Solution
A stretchable display panel design featuring island structures with pixel units, bridge structures connecting adjacent islands, and increasing bridge widths towards the wiring area, along with strategically placed openings to enhance tensile strength and prevent wire breakage, includes a flexible substrate and inorganic and organic layers for improved mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel uses a hollowing out design with island and bridge structures to enable stretching, then the display panel achieves stretchability and flexibility, but the wires at the edge of the display area easily break due to local stress during stretching
Solution Approach 1:
The patent applies local quality by making the bridge structures have different widths at different locations. Specifically, the bridge structures have a first width in the center display area and a second width greater than the first width in the transition display area close to the wiring area. This non-uniform width distribution concentrates mechanical strength where it is most needed - at the transition area where stress concentrates during stretching - thereby preventing wire breakage while maintaining overall stretchability.
2Ease of manufacture
If the bridge structures have uniform width throughout the display area, then the manufacturing process is simplified, but the wires at the transition area are more prone to breaking under local stress
Solution Approach 1:
The patent implements local quality by varying the width of bridge structures according to their location. The bridge structures have a first width in the center display area and a second width greater than the first width in the transition display area. This localized width increase at the transition area provides enhanced tensile strength precisely where stress concentrates during stretching, preventing wire breakage without requiring uniform width increase throughout the entire structure.
3Strength
If the bridge structures are made wider to increase tensile strength, then wire breakage resistance improves, but the display area size and pixel density are reduced
Solution Approach 1:
The patent applies local quality by increasing the bridge structure width only in the transition display area where stress concentrates during stretching, while maintaining the original width in the center display area. This localized width increase provides enhanced tensile strength precisely where needed to prevent wire breakage, without unnecessarily reducing the overall display area or pixel density.
Solution Approach 2:
The patent segments the display area into a center display area and a transition display area, with bridge structures having different widths in each segment. This segmentation allows the bridge structures to have optimized widths for their specific functional requirements - narrower in the center area to maximize display space, and wider in the transition area to provide mechanical strength during stretching.
Data Source
AI summary
A stretchable display panel and a display device are provided. The stretchable display panel includes a center display area, a transition display area, and a wiring area, and in a direction from the center display area to the wiring area, a width of bridge structures in the transition display area gradually increases. Island structures located at a peripheral area include an edge bridge structure, and through meeting of adjacent edge bridge structures, a width of the edge bridge structures is increased to increase tensile strength of the edge bridge structures, decreasing risk of wires breaking in the transition display area.