Resin Composition for Flexible Display Cover Windows
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Solution Overview
Problem
Flexible display panels require a cover window that balances flexibility and impact resistance, while minimizing visibility of trenches in folding areas to maintain display quality.
Innovation Solution
A resin composition comprising a (meth)acrylate copolymer with specific monomer units, crosslinker, and photoinitiator, applied as a resin layer under the cover window to match the refractive index of the cover layer, ensuring minimal visibility of trenches and enhanced mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cover window is made with high hardness for impact resistance, then protection capability is improved, but flexibility deteriorates
Solution Approach 1:
The patent employs a composite structure consisting of a cover layer (rigid material such as glass or plastic) and a resin layer (flexible material with specific mechanical properties). This composite design allows the cover layer to provide impact resistance while the resin layer provides flexibility, resolving the contradiction between hardness and flexibility. The resin layer acts as a buffer that absorbs stress during folding while maintaining overall structural integrity.
Solution Approach 2:
The resin layer is specifically positioned in the folding area of the cover window, where flexibility is most needed. This localized application allows the rigid cover layer to maintain its protective function in non-folding areas while the resin layer provides the necessary flexibility in the folding region, optimizing both impact resistance and adaptability.
2Adaptability or versatility
If trenches are formed in the folding area to enhance flexibility, then adaptability is improved, but visibility deteriorates due to trench visibility
Solution Approach 1:
The resin layer serves as an intermediary substance that fills the trenches formed in the folding area. By filling these trenches, the resin layer smooths out the surface irregularities that would otherwise be visible and affect display quality. At the same time, the resin layer maintains the flexibility needed for folding, thus resolving the contradiction between adaptability and information loss.
3Loss of information
If the resin layer has high refractive index to match cover layer, then visibility of trenches is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a refractive index range (1.4 to 1.6) for the resin layer to match the cover layer. By defining this parameter range, the patent balances the need for trench visibility reduction with practical manufacturing considerations. This parameter specification allows for adequate optical matching without imposing excessively tight tolerances that would make manufacturing difficult.
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 provides a cover window with improved impact resistance, flexibility, and reduced trench visibility, maintaining display quality and durability through optimized refractive index matching and mechanical characteristics.
Implementation Method 1
a first refractive index with respect to a first wavelength, the resin layer may have a second refractive index with respect to the first wavelength, and an absolute value of a difference between the first refractive index and the second refractive index may be 0.03 or less
Data Source
AI summary
A resin composition includes a (meth)acrylate copolymer, wherein a content of a first repeat unit derived from a first monomer represented by Formula 1 in the (meth)acrylate copolymer is about 20 wt % to about 80 wt % with respect to a total amount 100 wt % of monomeric units present in the (meth)acrylate copolymer,where R1 a C1 to C6 alkylene group, C1 to C6 alkyl group with one or more oxygen, or an aromatic group,R2 is a C1 to C6 alkyl group, C1 to C6 alkyl group with one or more oxygen, or an aromatic group, andat least one of R1 or R2 includes an aromatic group.