Foldable Display Cover Plate Wrinkle Prevention
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Solution Overview
Problem
Existing foldable display devices suffer from wrinkles in the flexible cover plate during bending due to incomplete bonding with the flexible display panel, leading to disengagement and aesthetic issues.
Innovation Solution
The foldable display device incorporates a flexible cover plate with a notch and a flexible printed circuit positioned such that their orthographic projections do not overlap, ensuring the second foldable region of the cover plate is completely bonded to the display panel, preventing wrinkles and maintaining protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flexible cover plate is bonded to the flexible display panel with overlapping regions, then the bonding strength is improved, but the flexible cover plate generates wrinkles during bending
Solution Approach 1:
The flexible cover plate is divided into a first foldable region and a second foldable region with different bonding configurations. The first foldable region has the flexible cover plate bonded to the flexible display panel, while the second foldable region has the flexible cover plate completely bonded to the flexible display panel without overlapping. This segmentation allows different regions to have different bonding strengths and flexibility characteristics.
Solution Approach 2:
Different regions of the flexible cover plate have different bonding properties. The first foldable region has partial bonding with overlapping, while the second foldable region has complete bonding without overlapping. This local differentiation in bonding quality allows the structure to prevent wrinkles in the complete bonding region while maintaining flexibility.
2Reliability
If the flexible printed circuit is positioned to overlap with the flexible cover plate, then the shielding function is improved, but the bending flexibility is reduced
Solution Approach 1:
The flexible printed circuit is extracted from the overlapping region with the flexible cover plate and positioned in a non-overlapping area. This separation maintains the shielding function of the flexible cover plate while allowing the flexible printed circuit to bend freely without restriction from the cover plate structure.
Solution Approach 2:
The flexible printed circuit is positioned in a different spatial dimension relative to the flexible cover plate, specifically in a non-overlapping area. This dimensional arrangement allows both components to perform their functions independently - the cover plate provides shielding while the circuit maintains bending flexibility.
3Reliability
If the flexible cover plate is completely bonded to the flexible display panel, then the protective function is improved, but the aesthetic appearance deteriorates due to wrinkles
Solution Approach 1:
The flexible cover plate is segmented into regions with different bonding characteristics. The second foldable region is completely bonded to provide protection, while the first foldable region has partial bonding to prevent wrinkle formation. This segmentation allows the protective function to be maintained in critical areas while aesthetic appearance is preserved in visible areas.
Solution Approach 2:
Different regions of the flexible cover plate have different bonding qualities - complete bonding in the second foldable region for protection and partial bonding in the first foldable region for aesthetics. This local quality differentiation resolves the contradiction between protective function and aesthetic appearance.
Data Source
AI summary
Provided is a foldable display device. The foldable display device includes a flexible display panel, a flexible cover plate and a binding part. The flexible display panel includes a first foldable region and a first side edge. The first foldable region includes a first sub-region, and a part of the first side edge is a boundary of the first sub-region. The flexible cover plate is bonded to a first surface of the flexible display panel and includes a second foldable region. An orthographic projection of the second foldable region on the first surface is within the first foldable region, the second foldable region is bonded to the first foldable region, and the orthographic projection of the second foldable region on the first surface is not overlapped with the first sub-region. The binding part is bonded to the first side edge.