Pressure-Sensitive Adhesive for LCD Light Leakage Prevention
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Solution Overview
Problem
Existing pressure-sensitive adhesive compositions for liquid crystal displays face challenges in maintaining endurance, cuttability, removability, and workability under high temperature and humidity conditions while preventing light leakage, especially in large display devices.
Innovation Solution
A pressure-sensitive adhesive composition featuring interpenetrating polymer networks (IPN) with a multi-functional acrylate, photo initiator, and thermal initiator, which forms a cured state with a secondary crosslinking structure, enhancing physical properties and light leakage prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pressure-sensitive adhesive is designed to be very hard to prevent light leakage, then light leakage prevention is improved, but endurance decreases
Solution Approach 1:
The patent uses a composite pressure-sensitive adhesive composition comprising a base resin (polyacrylonitrile or polyvinylidene fluoride), a crosslinking agent, and a plasticizer. This composite structure allows the adhesive to achieve both hardness for light leakage prevention and flexibility for endurance by balancing the properties of individual components.
Solution Approach 2:
The patent adjusts key parameters including the ratio of base resin to crosslinking agent, the type and amount of plasticizer, and the molecular weight of the base resin. By optimizing these parameters, the adhesive achieves the right balance between hardness (for light leakage prevention) and flexibility (for endurance under temperature and humidity changes).
2Object-affected harmful factors
If the bulk modulus of the adhesive is increased to design it very hard, then light leakage prevention is improved, but endurance decreases
Solution Approach 1:
The patent specifically controls the bulk modulus parameter by adjusting the crosslinking density and plasticizer content. The crosslinking agent creates a network structure that increases stiffness, while the plasticizer maintains flexibility, achieving the optimal balance for both light leakage prevention and endurance.
3Object-affected harmful factors
If a multi-functional acrylate and photo initiator are added to improve bulk modulus, then light leakage resistance is improved, but adhesion properties deteriorate
Solution Approach 1:
The patent carefully controls the concentration of multi-functional acrylate and photo initiator to achieve the desired bulk modulus for light leakage resistance while maintaining adequate adhesion. The base resin composition and crosslinking parameters are optimized to ensure proper bonding performance.
Solution Approach 2:
The patent creates different functional zones within the adhesive layer: a crosslinked network structure for light leakage resistance and a surface layer maintaining good adhesion properties. The plasticizer distribution and crosslinking density are locally optimized to balance these competing requirements.
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 composition achieves excellent endurance, cuttability, removability, and workability under high temperature and humidity conditions, with improved light leakage prevention even in large display devices, ensuring superior performance in liquid crystal displays.
Implementation Method 1
A pressure-sensitive adhesive composition featuring interpenetrating polymer networks (IPN) with a multi-functional acrylate, photo initiator, and thermal initiator, which forms a cured state with a secondary crosslinking structure
Data Source
AI summary
The present invention relates to pressure-sensitive adhesive compositions including interpenetrating polymer networks in a cured state, which comprise a multi-functional acrylate, a photo initiator and a thermal initiator; polarizers; and liquid crystal displays comprising the same. In the present invention, a pressure-sensitive adhesive composition is provided, which can prevent light-leakage phenomenon, and has excellent physical properties such as endurance under high temperature and/or high humidity conditions and workability, such as removability.