Phase-Separated Adhesive Layers for OLED Off-Angle Correction
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Solution Overview
Problem
Current solutions for off-angle correction in OLED displays, such as multi-layer optical films and replicated nanostructures, require additional films and adhesive layers with specific properties, which are not effectively addressed for achieving better visual effects at multiple angles.
Innovation Solution
Phase-separated articles with a matrix phase comprising acrylate functional groups and a stably dispersed silicone elastomer phase are used to form pressure-sensitive adhesive layers, which can be copolymerized with initiators and compatibilizers to control optical properties and improve adhesion and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multi-layer optical films and replicated nanostructures are used for off-angle correction, then visual effects at multiple angles are improved, but device complexity and manufacturing complexity increase due to requiring additional films and adhesive layers
Solution Approach 1:
The patent combines the adhesive layer and optical correction layer into a single integrated phase-separated adhesive composition. The matrix phase provides adhesive functionality while the dispersed silicone elastomer phase provides optical correction, eliminating the need for separate optical films and reducing device complexity.
Solution Approach 2:
The invention uses a composite material system with phase-separated morphology, where a matrix polymer phase is combined with dispersed silicone elastomer domains. This composite structure enables simultaneous achievement of adhesive properties and optical correction properties within a single material layer.
2Illumination intensity
If additional films and adhesive layers are added to achieve desired optical properties, then off-angle visual effects are improved, but manufacturing complexity increases
Solution Approach 1:
The phase-separated adhesive composition performs multiple functions simultaneously: it provides adhesive bonding strength through the matrix phase while correcting off-axis color shift through the silicone elastomer phase. This multi-functionality eliminates the need for multiple specialized layers, simplifying manufacturing.
Solution Approach 2:
The patent merges the adhesive function and optical correction function into a single material layer applied in one step, reducing the number of manufacturing steps from multiple layer deposits to a single coating and curing process.
3Device complexity
If phase-separated adhesive layers are used, then device complexity is reduced by eliminating additional films, but manufacturing precision requirements increase for controlling phase separation
Solution Approach 1:
The patent controls phase separation morphology by adjusting compositional parameters including the ratio of matrix polymer to silicone elastomer, molecular weight of polymers, and crosslinking density. These parameter changes enable control of domain size and distribution to optimize optical correction while maintaining adhesive performance.
Solution Approach 2:
The use of a composite material system with immiscible polymer and silicone phases naturally drives phase separation during curing. The thermodynamic incompatibility between phases creates the desired microstructure without requiring precise external control, reducing manufacturing complexity.
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 improved off-axis color shift and brightness uniformity in OLED displays, enhancing visual effects at various angles without the need for additional films, by leveraging the properties of acrylate and silicone elastomer phases in the adhesive layers.
Implementation Method 1
copolymerizing functionalized silicone elastomer, acrylate functional group containing monomers, initiator, and an optional compatibilizer in solvents to form a solution polymer coating composition
Implementation Method 2
a matrix phase comprising an acrylate functional group; and a silicone elastomer phase stably dispersed in the matrix phase
Data Source
AI summary
Phase separated articles that include a matrix phase including an acrylate copolymer; and a silicone elastomer phase stably dispersed in the matrix phase are described. The matrix phase may be derived from precursors comprising from 60 to 95 parts by weight of an alkyl acrylate having an alkyl group having 1 to 14 carbon atoms. Methods of forming phase separated articles, and articles including phase separated articles are also described.