Foldable Display Back Cover With Unevenness Compensation Patterns
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Solution Overview
Problem
Foldable display devices experience image distortion and unevenness at the folding part due to differences in material properties between the flexible folding part and rigid non-folding part, leading to potential drooping and deformation under stress or temperature changes.
Innovation Solution
A foldable display device design featuring a back cover with folding patterns, open patterns, and unevenness compensation patterns on the adhesive layer, which compensates for thickness differences between the folding and non-folding parts, ensuring a flat and distortion-free display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the back cover uses different materials for folding and non-folding parts, then flexibility at the folding part is improved, but unevenness and image distortion occur at the boundary surface
Solution Approach 1:
The back cover is designed with different structural characteristics in different regions: the folding part contains folding patterns (creases) that enable flexibility, while the non-folding part maintains a flat rigid structure. This local differentiation allows each region to perform its specific function without compromising the other.
Solution Approach 2:
The back cover is segmented into distinct folding and non-folding regions with clearly defined boundaries. The folding patterns create discrete crease lines that separate flexible and rigid zones, preventing stress transmission from the folding part to the non-folding part, thereby avoiding boundary surface unevenness.
2Adaptability or versatility
If the folding part is made flexible, then foldability is improved, but stress concentration causes curling and drooping after repeated folding
Solution Approach 1:
Folding patterns (pre-formed creases) are created in advance during manufacturing, establishing predetermined folding lines before the device is put into use. These pre-formed creases guide the folding process and distribute stress evenly along the crease lines, preventing stress concentration that would otherwise cause curling or drooping after repeated folding.
Solution Approach 2:
The folding patterns act as stress-dissipating structures that cushion the impact of repeated folding operations. By providing predetermined folding pathways, the structure prevents unexpected stress concentration points that could lead to structural failure or deformation over time.
3Adaptability or versatility
If different materials are used for folding and non-folding parts, then flexibility is improved, but the flexible part deforms and hardens under high temperature and humidity
Solution Approach 1:
Different regions of the back cover are assigned different material properties and structural characteristics appropriate to their functional requirements. The folding part uses materials and structures optimized for flexibility and repeated bending, while the non-folding part uses materials optimized for stability and resistance to environmental conditions.
Data Source
AI summary
Disclosed is a foldable display device capable of preventing distortion of a folding part of a display screen due to deformation of the folding part. The foldable display device includes a display panel including a folding part and non-folding parts, and a back cover attached to the rear surface of the display panel via an adhesive layer, wherein the back cover includes folding patterns and open patterns, both of which are disposed at the folding part, and unevenness compensation patterns disposed on areas of a surface of the back cover contacting the adhesive layer, the areas of the surface of the back cover corresponding to the non-folding parts. The unevenness compensation patterns may be a plurality of open patterns, which are fully formed through the back cover, or may be a plurality of grooves, which are not fully formed through the back cover.