Display Adhesive Resin Composition for UV-Stable Bonding
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Solution Overview
Problem
Existing adhesive members in display devices face challenges in maintaining stable bonding and display quality under various usage environments, particularly in preventing degradation from external light exposure.
Innovation Solution
A resin composition comprising specific monomers, a benzotriazole-based UV absorber, a diprenyl glycerin ether, and a photoinitiator with a bisacylphosphine oxide group, which forms an adhesive member that provides high reliability and low light transmittance, especially in the UV range, ensuring stable bonding and preserving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive members are used in display devices, then bonding between components is achieved, but degradation from UV light exposure occurs leading to reduced reliability and display quality
Solution Approach 1:
The patent converts the harmful UV light into a beneficial curing mechanism by incorporating photoinitiators that enable photocuring of the adhesive member. This allows the adhesive to be applied in a liquid state and then cured by UV exposure, transforming the harmful UV radiation into a useful curing process that enhances adhesive strength without degradation
Solution Approach 2:
The patent employs a composite resin composition containing multiple components: monomers with specific functional groups, photoinitiators, and UV absorbers. This composite formulation provides both curing capability through photopolymerization and protection against UV degradation, resolving the contradiction between achieving strong adhesive bonding and resisting UV-induced degradation
2Reliability
If UV absorbers are added to prevent light degradation, then display quality is preserved, but the resin composition becomes more complex
Solution Approach 1:
The patent optimizes the concentration parameters of UV absorbers and photoinitiators within specific ranges to achieve the desired balance between UV protection and curing efficiency. By carefully controlling these parameters, the patent maintains relatively simple resin composition while achieving both display quality preservation and reliable bonding
3Strength
If photocuring is used to form adhesive member, then bonding strength is improved, but control of transmittance and thickness becomes more difficult
Solution Approach 1:
The patent adjusts parameters including monomer molecular weight, photoinitiator concentration, and UV absorber content to achieve precise control over curing depth and final thickness. These parameter optimizations enable consistent manufacturing of adhesive members with controlled thickness and transmittance while maintaining high bonding strength through effective photocuring
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 member effectively prevents degradation of display components from UV light, maintaining high adhesive strength and display quality, with minimal changes in color index, thus enhancing the reliability and lifetime of display devices.
Implementation Method 1
at least one photoinitiator containing a bisacylphosphine oxide group
Implementation Method 2
a benzotriazole-based ultraviolet (UV) absorber
Data Source
AI summary
A resin composition includes at least one first monomer containing one or two polymerizable unsaturated groups per monomer unit, at least one sub polymer having a weight average molecular weight in a range of about 5,000 to about 40,000 and derived from a second monomer containing two or more polymerizable unsaturated groups per monomer unit, a benzotriazole-based UV absorber, a diprenyl glycerin ether, and at least one photoinitiator containing a bisacylphosphine oxide group.