Bendable Substrate with Segmented Protection Films
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Solution Overview
Problem
Existing display devices face challenges in minimizing the non-display area, particularly when attempting to integrate a bendable substrate to reduce the space occupied by pads and components in multimedia devices.
Innovation Solution
A display device design featuring a substrate with distinct non-bendable and bendable areas, where the non-bendable areas are separated by a bendable area, and protected by different protection films, such as glass and polyimide, to minimize the non-display area while allowing for substrate bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single protection film is used to cover both non-bendable areas, then the structure is simple, but the protection performance is insufficient for different functional requirements
Solution Approach 1:
The protection film is divided into two separate films: a first protection film covering the first non-bendable area and a second protection film covering the second non-bendable area. This segmentation allows each protection film to be optimized for its specific functional requirements, with the first protection film providing rigid protection for the display module area and the second protection film providing flexible protection for the pad area, thereby resolving the contradiction between structural simplicity and protection performance.
Solution Approach 2:
Different materials are selected for the first and second protection films based on the local functional requirements of different non-bendable areas. The first protection film uses rigid material (such as glass) suitable for protecting the display module, while the second protection film uses flexible material (such as polyimide) suitable for protecting the pad area, achieving local optimization of protection performance.
2Adaptability or versatility
If the entire substrate is made bendable, then flexibility is improved, but the structural stability and protection of non-bendable components deteriorates
Solution Approach 1:
The substrate is divided into bendable areas and non-bendable areas, with corresponding separate protection films for different non-bendable areas. This segmentation allows the substrate to maintain flexibility in the bendable areas while providing stable protection for components in non-bendable areas, resolving the contradiction between flexibility and structural stability.
Solution Approach 2:
Different protection strategies are applied to different regions of the substrate. The first non-bendable area receives rigid protection for stability, while the second non-bendable area receives flexible protection that accommodates substrate bending, allowing the substrate to be flexible overall while maintaining local stability where needed.
3Reliability
If rigid protection material is used for the entire substrate, then protection performance is improved, but the ability to bend and reduce non-display area deteriorates
Solution Approach 1:
The protection film material is selected based on local requirements: rigid material (such as glass) is used for the first protection film in the first non-bendable area to provide high protection performance, while flexible material (such as polyimide) is used for the second protection film in the second non-bendable area to maintain substrate bendability. This local differentiation resolves the contradiction between protection performance and bendability.
Data Source
AI summary
A display device includes a substrate having a first surface, a second surface opposite to the first surface, a first non-bendable area, a second non-bendable area, and a bendable area, a display module disposed on the first surface of the substrate, a first protection film disposed on the second surface of the substrate to correspond to the first non-bending area, and a second protection film that differs from the first protection film disposed on the second surface of the substrate to correspond to the second non-bending area, where the first non-bendable area and the second non-bendable area are separated from each other with the bendable area in between.