Stretchable Display Panel With Variable-Modulus Connection Support
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Solution Overview
Problem
Existing display apparatuses, particularly in mobile electronic devices, face limitations in flexibility and durability, especially when subjected to stretching or bending, often leading to cracks or three-dimensional distortions due to non-uniaxial stretchability.
Innovation Solution
A display apparatus design featuring a display panel with contractible and stretchable connection portions, where a first member with varying modulus properties is integrated, including a second portion with a lower modulus than the first, allowing for uniaxial and biaxial stretching without cracking, and incorporating a substrate with flexible materials to enhance flexibility and reduce stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display apparatus is made flexible and stretchable, then adaptability and versatility are improved, but reliability deteriorates due to cracks and three-dimensional distortions
Solution Approach 1:
The first member is divided into multiple portions (first portion overlapping the base portion, second portion overlapping the connection portions, and third portion overlapping each connection portion) with different modulus values. This segmentation allows each portion to perform its specific function: the first portion maintains structural integrity, the second portion provides overall flexibility, and the third portion offers localized support at connection portions, thereby preventing cracks and distortions while enabling flexibility.
Solution Approach 2:
Different portions of the first member are assigned different modulus values according to their functional requirements. The first portion has a higher modulus for structural stability, the second portion has a lower modulus for flexibility, and the third portion has a modulus different from the second portion to provide localized reinforcement at connection portions. This local differentiation of material properties resolves the contradiction between flexibility and reliability.
2Device complexity
If a single modulus material is used for the first member, then device complexity is reduced, but reliability worsens due to inability to prevent cracks and distortions
Solution Approach 1:
The first member incorporates multiple portions with different modulus values tailored to specific functional requirements. The first portion (higher modulus) provides structural support, the second portion (lower modulus) enables flexibility, and the third portion (different modulus) reinforces connection areas. This local differentiation of material properties prevents cracks and distortions while maintaining reasonable structural simplicity.
Solution Approach 2:
The first member is constructed as a composite structure with multiple portions having different modulus values. This composite approach combines materials or structures with different mechanical properties in a single integrated component, enabling the display apparatus to achieve both flexibility and reliability without requiring multiple separate components.
3Manufacturing precision
If the first member has uniform modulus throughout, then manufacturing precision is improved, but reliability deteriorates due to stress concentration during deformation
Solution Approach 1:
The first member is designed with different modulus values in different portions according to their specific functional requirements. The first portion has a higher modulus for structural stability, the second portion has a lower modulus for flexibility, and the third portion has a modulus different from the second portion to provide localized stress management at connection portions. This local differentiation prevents stress concentration and improves reliability during deformation.
4Strength
If a rigid structure is used for the display apparatus, then strength is improved, but adaptability worsens due to inability to stretch and bend
Solution Approach 1:
The first member incorporates multiple portions with different modulus values to balance strength and adaptability. The first portion (higher modulus) maintains structural strength, while the second portion (lower modulus) provides flexibility for stretching and bending. The third portion (different modulus) offers localized support at connection portions. This local differentiation of material properties allows the display apparatus to achieve both strength and adaptability.
Solution Approach 2:
The first member is constructed as a composite structure with multiple portions having different modulus values, combining rigid and flexible characteristics in a single integrated component. This composite approach enables the display apparatus to maintain structural strength while achieving stretchability and bendability without requiring multiple separate components.
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 enables the display apparatus to be highly contractible and stretchable, reducing stress and preventing cracks during deformation, thereby improving user convenience and suitability for wearable devices.
Implementation Method 1
a modulus of the second portion of the first member is less than a modulus of the first portion of the first member... allowing for uniaxial and biaxial stretching without cracking
Implementation Method 2
the second portion of the first member may include elastomer having a positive Poisson's ratio
Data Source
AI summary
A display apparatus includes a display panel including a base portion and a plurality of connection portions extending from the base portion in different directions, and a first member disposed on a surface of the display panel and including a first portion overlapping the base portion of the display panel and a second portion overlapping the plurality of connection portions of the display panel, where a modulus of the second portion of the first member is less than a modulus of the first portion of the first member.