Rollable Display Edge Seal Stress Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rollable display devices are prone to cracking due to stress applied during winding and unwinding, particularly around the edges, which reduces their durability and reliability.
Innovation Solution
A rollable display device design that incorporates a first seal member with a lower modulus of elasticity and a second seal member with a higher modulus of elasticity, strategically positioned around the edges to enhance rigidity and minimize stress-induced damage, including a buffer layer, encapsulation substrate, and adhesive layers to distribute stress effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is made flexible for rolling, then it can be wound and unwound, but cracks occur around the edges due to stress during winding and unwinding
Solution Approach 1:
The patent applies local quality by providing different seal members with different modulus of elasticity at different locations around the display panel edges. Specifically, a first seal member with lower modulus of elasticity is used in regions requiring flexibility, while a second seal member with higher modulus of elasticity is used in regions prone to cracking, thereby locally enhancing crack resistance without compromising overall rollability.
Solution Approach 2:
The patent employs composite materials by combining multiple seal members made of different materials with different mechanical properties. The first seal member and second seal member are composed of materials with different moduli of elasticity, creating a composite sealing structure that balances flexibility and strength to prevent cracks during rolling operations.
2Strength
If the rigidity of the display panel is increased to prevent cracks, then crack resistance improves, but the ability to wind and unwind is reduced
Solution Approach 1:
The patent implements local quality by strategically placing seal members with different rigidity characteristics at specific locations around the display panel. The first seal member with lower modulus of elasticity maintains flexibility in areas requiring bending, while the second seal member with higher modulus of elasticity provides crack resistance in stress-prone areas, thus achieving both flexibility and strength locally where needed.
Solution Approach 2:
The patent applies parameter changes by varying the modulus of elasticity parameter of the seal members at different positions. By selecting materials with appropriate modulus values for different locations, the patent optimizes the balance between flexibility and crack resistance, allowing the display panel to be both rollable and durable.
Data Source
AI summary
A rollably display device includes a flexible display panel with an active area for displaying images and a non-active area surrounding the active area. A first seal member is disposed in the non-active area on a first portion of a side surface of the display panel and a second seal member is disposed on the first seal member and on a second portion of the side surface of the display panel to reduce the likelihood of occurrence of cracks at the sides of the display panel during rolling and unrolling of the display panel around a roller.