Rollable Window Member with Composite Layers for Impact Resistance
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Solution Overview
Problem
Conventional window panels in display devices are prone to breakage due to external impacts, especially when they are flexible and designed for foldable properties, lacking sufficient impact resistance and scratch resistance.
Innovation Solution
A rollable window member comprising a first member with a low modulus and a second member with a higher modulus, both made from materials like silicone-, urethane-, and acryl-based materials, where the second member has a recovery rate of 40% or more and an absolute difference in recovery rate with the first member is 45% or less, providing improved impact and scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the window panel is made thinner to enable folding, then the flexibility and foldability are improved, but the impact resistance deteriorates
Solution Approach 1:
The window panel is constructed as a composite structure with a first member (flexible substrate) and a second member (coating layer), where each layer has different material properties. The first member provides flexibility for folding, while the second member provides hardness for impact and scratch resistance. This composite structure resolves the contradiction by combining materials with complementary properties rather than using a single material that must compromise between flexibility and strength.
2Strength
If the window panel is made with higher hardness to resist scratches, then the scratch resistance is improved, but the rollability and flexibility deteriorate
Solution Approach 1:
The window panel is segmented into two functional layers: the first member (substrate) that provides flexibility and rollability, and the second member (coating layer) that provides scratch resistance. By dividing the window panel into separate functional segments, each layer can be optimized for its specific purpose without compromising the other property.
Solution Approach 2:
Different regions of the window panel structure have different material qualities optimized for their specific functions. The first member has low modulus and high flexibility localized to the substrate layer, while the second member has high hardness localized to the coating layer. This local differentiation of material properties allows the overall structure to achieve both flexibility and scratch resistance.
3Device complexity
If a single material is used for the window panel, then the device complexity is reduced, but the ability to provide both flexibility and impact resistance deteriorates
Solution Approach 1:
The invention uses a composite structure with a first member and a second member having different material properties. The first member provides flexibility and base structural integrity, while the second member provides enhanced impact and scratch resistance. This composite approach maintains relative structural simplicity while significantly improving reliability against impacts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the rollable property and impact resistance of the window member, preventing cracks during rolling and offering effective protection to the display panel from external impacts.
Implementation Method 1
A recovery rate of the second member may be 40% or more, and an absolute value of difference in recovery rate between the first and second members may be 45% or less. The recovery rate may be measured from the window member that is stretched by 5%.
Implementation Method 2
the window panel is used to protect internal functional layers from an external impact, and for this reason, the window panel has the highest risk of breakage from the external impact
Implementation Method 3
the display device may further include an adhesive member provided between the display panel and the protection panel
Data Source
AI summary
A window member may include a first member and a second member on the first member. A recovery rate of the second member may be 40% or more, and an absolute value of difference in recovery rate between the first and second members may be 45% or less.