Foldable Display Back Cover Pattern Design
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Solution Overview
Problem
Foldable display devices face issues with distortion and unevenness at the folding part due to differences in material properties and stress concentration, leading to curvature or drooping of the display screen.
Innovation Solution
A foldable display device design featuring a display panel with a support having protruding patterns that fit into open patterns on the back cover, ensuring a seamless interface and reducing stress concentrations, thereby maintaining flatness and preventing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the folding part and non-folding part are made of different materials to achieve flexibility and protection, then the folding property and protection are improved, but unevenness is generated at the boundary surface causing display distortion
Solution Approach 1:
The back cover is designed with different regional structures: a first region with a first pattern for flexibility in the folding area, and a second region with a second pattern for rigidity in the non-folding area. This local differentiation allows each region to have optimized properties for its specific function while maintaining overall structural integrity and preventing display distortion.
Solution Approach 2:
The back cover is segmented into multiple regions with different patterns (first pattern and second pattern) rather than using a uniform structure. This segmentation allows the folding part and non-folding part to have different mechanical properties, enabling both flexibility where needed and structural support where required, while eliminating boundary unevenness.
2Ease of operation
If the folding part is made flexible to enable folding, then the foldability is improved, but the flexible part curls upward or droops due to stress concentration after repeated folding
Solution Approach 1:
The back cover is pre-formed with a first pattern (such as hollow patterns or recesses) in the folding region before the folding process begins. This preliminary structural design anticipates and compensates for stress concentration that occurs during repeated folding, preventing the flexible part from curling upward or drooping by providing pre-positioned stress relief zones.
Solution Approach 2:
The back cover incorporates a flexible region with a first pattern that allows controlled deformation during folding. The patterned structure (hollow patterns, recesses, or specific geometric designs) enables the thin film to flex repeatedly without accumulating damaging stress, maintaining both foldability and structural stability over time.
3Adaptability or versatility
If different materials are used for folding and non-folding parts, then flexibility and protection are achieved, but the materials are compressed to different extents causing unevenness and distortion
Solution Approach 1:
Instead of using different materials that cause compression unevenness, the invention uses the same base material throughout but applies different local patterns (first pattern in folding region, second pattern in non-folding region). This achieves functional differentiation while maintaining uniform material properties, eliminating compression-induced unevenness at material boundaries.
Solution Approach 2:
The back cover employs a composite pattern design within a unified material structure. The first pattern and second pattern create regions with different effective mechanical properties (flexibility vs. rigidity) while using the same base material, avoiding the compression mismatches that occur when joining different materials with different physical properties.
Data Source
AI summary
A foldable display device can include a display panel including a first non-folding part, a second non-folding part and a folding part disposed between the first and second non-folding parts; a support disposed on a rear surface of the display panel; and a back cover disposed on a rear surface of the support, in which the back cover includes open patterns exposing the support, and folding patterns disposed on an area of the rear surface of the support corresponding to the folding part, the support includes protruding patterns disposed on an area of the support corresponding to the open patterns of the back cover, and the protruding patterns are fitted into the open patterns.