Block Copolymer Adhesive for Display Bending and Light Leakage
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Solution Overview
Problem
Pressure-sensitive adhesive compositions for optical films in liquid crystal display devices face challenges in achieving optimal cohesive force, adhesive reliability, re-workability, and stress relaxation properties while minimizing light leakage and bending phenomena due to heat-driven stress.
Innovation Solution
A polymer composition comprising a block copolymer with a triblock structure, where one block has a glass transition temperature of 20°C or higher and the other block has a glass transition temperature of 10°C or lower, forming a micro phase-separated structure that enables physical cross-linking and stress relaxation, thereby improving adhesive reliability and reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure-sensitive adhesive composition is used for optical films, then adhesive force and cohesive force are improved, but light leakage and bending phenomena occur due to heat-driven stress
Solution Approach 1:
The patent changes the glass transition temperature parameter of the adhesive polymer by blending different polymers. The composition includes a polymer with Tg of 50-150°C and another with Tg of -50-50°C, creating a balanced adhesive that maintains strength while reducing light leakage through optimized thermal properties
Solution Approach 2:
The patent uses a composite adhesive composition combining multiple polymer types with different glass transition temperatures. This composite approach allows the adhesive to exhibit both strong bonding properties and reduced light leakage by leveraging the complementary characteristics of each polymer component
2Reliability
If a pressure-sensitive adhesive composition is used for optical films, then adhesive force and cohesive force are improved, but bending phenomena occur due to heat-driven stress
Solution Approach 1:
The patent adjusts the glass transition temperature parameter of the adhesive to fall within 50-150°C for the main polymer. This parameter optimization ensures the adhesive remains stable under heat-driven stress during display device operation, preventing bending phenomena while maintaining strong adhesion
Solution Approach 2:
The patent creates local quality differences within the adhesive layer by incorporating polymers with different Tg ranges. The higher Tg polymer (50-150°C) provides structural stability to prevent bending, while the lower Tg polymer (-50-50°C) maintains adhesive flexibility, achieving both shape stability and bonding strength
3Ease of repair
If re-workability is improved for optical films, then ease of repair is enhanced, but adhesive reliability may be compromised
Solution Approach 1:
The patent optimizes the glass transition temperature parameter to create an adhesive that transitions between states at different temperatures. At room temperature, the adhesive maintains strong bonding for reliability, while under mild heating conditions, it becomes more pliable to enable re-workability without compromising long-term adhesive performance
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 polymer composition effectively alleviates bending and light leakage issues in display devices by forming a pressure-sensitive adhesive layer with excellent workability, durability, and dimensional stability through a combination of physical and chemical cross-linking.
Implementation Method 1
forming a micro phase-separated structure that enables physical cross-linking and stress relaxation
Implementation Method 2
forming a micro phase-separated structure that enables physical cross-linking and stress relaxation
Implementation Method 3
through a combination of physical and chemical cross-linking
Data Source
AI summary
The present invention relates to a polymer composition, an optical laminate and a display device, and can provide a polymer composition capable of forming a pressure-sensitive adhesive layer which has excellent workability, durability and dimensional stability and is capable of effectively alleviating the bending phenomenon of the display, through a polymer capable of forming a physically cross-linked structure together with a chemically cross-linked structure. In addition, the present invention can provide an optical laminate comprising a cross-linked product of the polymer composition and a display device comprising the same.