Flexible Display Back Plate Structure for Thin, Durable Folding
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Solution Overview
Problem
Existing flexible display devices face issues with rigidity and durability, particularly when folding, due to the use of plate tops and impact absorption layers, which increase thickness and limit the radius of curvature, and expose visible patterns on the surface.
Innovation Solution
A flexible display device design that includes a back plate with a hard coating layer on a base member, eliminating the need for a plate top or impact absorption layer, while using a plate bottom and adhesive layers to enhance rigidity and durability, and incorporating an optical control layer for improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a plate top, plate bottom, and impact absorption layer are combined to be used below the back plate, then rigidity and impact resistance are ensured, but the thickness of the flexible display device is increased so that the folding characteristic is degraded and the reduction of the radius of curvature is limited
Solution Approach 1:
The patent removes the plate top and impact absorption layer from the conventional structure, retaining only the essential plate bottom with opening patterns. This extraction eliminates unnecessary components that increase thickness while compromising rigidity, as the plate bottom alone with optimized opening patterns provides sufficient structural support for folding operations.
Solution Approach 2:
The patent employs a thin film back plate combined with a plate bottom structure that provides rigidity while maintaining flexibility. The plate bottom with strategically designed opening patterns creates a lightweight, thin structure that resists impact and maintains structural integrity during folding, enabling reduced radius of curvature without sacrificing strength.
2Length of moving object
If the plate top or the impact absorption layer is removed, then the thickness is reduced, but the rigidity is lowered and a failure due to dent or puncture is caused on the surface during the folding
Solution Approach 1:
The patent applies local quality by creating opening patterns specifically in the plate bottom at locations corresponding to folding areas. This localized structural modification provides enhanced flexibility and stress distribution precisely where needed during folding, preventing dent and puncture failures while maintaining overall device thickness reduction.
Solution Approach 2:
The patent uses a composite structure combining the back plate, plate bottom with opening patterns, and adhesive layers. This composite design creates a multi-layer system where each component contributes specific properties - the plate bottom provides structural support with localized flexibility through opening patterns, while adhesive layers ensure strong bonding, collectively preventing surface failures during folding.
3Ease of operation
If an opening pattern is formed on the plate bottom to improve the folding characteristic, then the folding characteristic is improved, but when the plate top is removed, the opening pattern is visible to the user so that the exterior appearance quality is degraded
Solution Approach 1:
The patent removes the plate top that would normally conceal the opening patterns, but compensates by optimizing the opening pattern design and positioning. The opening patterns are strategically located and designed to be invisible from the front display surface while still providing the necessary flexibility for folding, thus maintaining exterior appearance quality without sacrificing folding characteristics.
4Strength
If multiple durability reinforcement layers are combined to be used on a rear surface of the back plate, then the rigidity is improved, but the thickness is increased so that the radius of curvature cannot be reduced
Solution Approach 1:
The patent extracts and removes unnecessary durability reinforcement layers (plate top and impact absorption layer) from the conventional multi-layer structure. The remaining plate bottom with optimized opening patterns provides sufficient rigidity and durability while maintaining minimal thickness, enabling reduced radius of curvature for flexible display applications.
Data Source
AI summary
The present disclosure relates to a flexible display device, and more particularly a flexible display device includes a display panel, a back plate disposed below the display panel; and a plate bottom disposed below the back plate, and the back plate includes a base member and a hard coating layer disposed on at least one surface of the base member. The present disclosure provides a flexible display device which minimizes dent or puncture failures and reduces a rigidity difference between the folding area and the non-folding area without including a plate top or an impact absorption layer to have excellent durability.