Rollable Flexible Display Cover Layer for Strength and Bending
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Solution Overview
Problem
Existing flexible displays face limitations in securing flexibility for deformation between curved and flat surfaces due to uniform layer thickness, which affects strength and functionality.
Innovation Solution
Implementing layers with varying structures, such as thicknesses, densities, or shapes in variable and invariable parts of the flexible display to enhance strength and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all layers have the same thickness, then the manufacturing process is simple, but the flexibility for deformation into curved or flat surfaces is limited
Solution Approach 1:
The patent applies local quality by making the cover layer have different thicknesses in different regions: a first thickness in the base part and a second thickness (smaller than the first) in the rollable part. This allows the display to maintain strength where needed while enabling flexibility and deformation in the rollable region, resolving the contradiction between manufacturing simplicity and deformation flexibility.
Solution Approach 2:
The cover layer is segmented into two distinct portions with different thicknesses: a first portion in the base part and a second portion in the rollable part. This segmentation allows each region to have optimized properties for its specific function, with the thinner second portion enabling the flexibility required for rolling and curved surface deformation.
2Adaptability or versatility
If the cover layer is made thinner to improve flexibility, then the flexibility for deformation is enhanced, but the strength of the display is reduced
Solution Approach 1:
The patent resolves this contradiction by applying local quality: the cover layer has a first thickness in the base part providing strength, and a second thickness (smaller than the first) in the rollable part providing flexibility. This spatial variation in thickness allows each region to optimize for its primary requirement without compromising the other.
Data Source
AI summary
An electronic device according to an embodiment of the disclosure includes: a first housing, a second housing coupled to one side of the first housing and configured to slide in multiple directions, and a display including a plurality of layers, and a size of a visible region of the display of a front surface of the electronic device is configured to be changed in response to a sliding operation of the second housing. The display includes a base part forming the front surface of the electronic device and configured to maintain a shape based on the second structure sliding and a rollable part extending from the base part and configured to be deformed to be flat or curved based on the sliding operation of the second housing. The plurality of layers include a panel layer, a reinforcement layer disposed on a surface of the panel layer, and a cover layer disposed on a surface of the reinforcement layer and facing the panel layer with the reinforcement layer therebetween. The cover layer includes a first portion included in the base part of the display and a second portion included in the rollable part of the display when a section of the display is viewed. The first portion and the second portion are different from each other in terms of at least one of a structure, a shape, or a property.