Optically Clear Adhesive Resin Composition for Display Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face challenges in reducing the size of the non-display area, particularly in the overlap region between the polarizing plate and the non-display area, while maintaining optical transparency and reliability, especially at high temperatures.
Innovation Solution
An optically transparent adhesive resin composition is developed, comprising an ester polymer, a (meth)acrylic ester polymer, a rubber polymer, and a crystalline polymer, which forms a film that covers the polarizing plate and display panel, providing improved elastic and adhesive forces. This composition includes a crystalline polymer with a melting point and crystallization temperature, enhancing the film's properties and allowing it to cover both transparent and opaque areas, thereby reducing the visibility of air pockets and improving high-temperature reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area is reduced to improve display area, then the overlap area between polarizing plate and non-display area decreases, but this makes it difficult to maintain adhesive coverage and optical transparency
Solution Approach 1:
The patent applies different crystallinity levels to different regions of the adhesive resin film. The first area (overlapping transparent area) has different crystallinity from the second area (overlapping opaque area), allowing each region to be optimized for its specific function while maintaining overall reliability
Solution Approach 2:
The adhesive resin composition is a composite material containing multiple polymers (ester polymer, acrylic polymer, and crystalline polymer) with specific molecular weights and ratios. This composite structure provides both adhesive strength and optical transparency properties needed for the reduced non-display area configuration
2Reliability
If conventional adhesive materials are used, then manufacturing is simple, but elastic force and adhesive force are insufficient at high temperatures
Solution Approach 1:
The patent specifies precise parameter ranges for the adhesive composition including molecular weights (ester polymer: 10,000-100,000, acrylic polymer: 5,000-50,000), content ratios (crystalline polymer: 1-50 parts by weight), and glass transition temperatures. These controlled parameters ensure high-temperature reliability while managing composition complexity
Solution Approach 2:
The adhesive resin composition combines multiple polymers (ester polymer, acrylic polymer, and crystalline polymer) with specific molecular weights and ratios to achieve high-temperature reliability. The composite structure provides both elastic force and adhesive force needed for reliable performance
3Manufacturing precision
If air pockets are present in the adhesive layer, then manufacturing is easier, but air pockets become visible and reduce optical quality
Solution Approach 1:
The patent controls the viscosity and composition of the adhesive resin to prevent air pocket formation. By specifying molecular weights and content ratios of different polymers, the adhesive achieves optimal flow and filling properties that eliminate visible air pockets while maintaining ease of application
Solution Approach 2:
The adhesive resin composition is optimized to have different properties in different contexts: it flows easily during application to fill gaps uniformly, then maintains structural integrity to prevent air pocket formation. The crystalline polymer content (1-50 parts by weight) specifically controls this behavior
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 adhesive resin film achieves improved elastic and adhesive forces, ensuring that air pockets are not visible and enhancing the display device's reliability at high temperatures by effectively covering the polarizing plate and display panel, while maintaining optical transparency and structural integrity.
Implementation Method 1
a crystalline polymer
Implementation Method 2
adhesive force
Data Source
AI summary
An optically transparent adhesive resin composition includes an ester polymer which contains an ester bond within a repeating unit, a (meth)acrylic ester polymer which contains a (meth)acrylic ester bond within the repeating unit, a rubber polymer, and a crystalline polymer.