UV Blocking Adhesive Sheet for Display Devices
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Solution Overview
Problem
Organic light emitting display devices do not effectively block ultraviolet light, leading to reduced visibility and durability issues, especially in outdoor environments exposed to sunlight.
Innovation Solution
An adhesive sheet with a light-absorbing dye dispersed in an adhesive binder resin, where the dye content is 80 parts by weight or less, and a specific triazine ultraviolet absorber and second light-absorbing dye are used to achieve high UV blocking without reducing visible light transmittance, applied in various display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light absorbing dye is added to block ultraviolet light, then UV blocking performance is improved, but visible light transmittance decreases
Solution Approach 1:
The patent applies local quality by selecting dyes with specific absorption characteristics that target only the ultraviolet region (405-430 nm wavelengths) while remaining transparent in the visible region. The adhesive composition is designed to have differentiated optical properties across different wavelength ranges, blocking harmful UV light while maintaining high visible light transmittance for display quality.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the dye content within 1-80 parts by weight per 100 parts of adhesive binder resin. This quantitative parameter optimization ensures sufficient UV blocking performance while preventing excessive dye concentration that would reduce visible light transmittance and compromise adhesive properties.
2Object-affected harmful factors
If a light absorbing dye is added to block ultraviolet light, then UV blocking performance is improved, but adhesion performance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the dye concentration within a specific range (1-80 parts by weight per 100 parts adhesive binder resin). This controlled parameter adjustment ensures adequate UV blocking while preventing excessive dye content that would interfere with adhesive bonding to the display device.
Solution Approach 2:
The patent uses composite materials by formulating an adhesive composition that integrates UV-absorbing dyes with adhesive binder resin. This composite structure combines the UV blocking functionality of the dye with the bonding capability of the adhesive, creating a multifunctional material that simultaneously protects against UV light and provides reliable adhesion.
3Object-affected harmful factors
If dye content is increased to enhance UV blocking, then UV absorption improves, but adhesive properties deteriorate
Solution Approach 1:
The patent applies parameter changes by establishing an optimized dye content range of 1-80 parts by weight per 100 parts adhesive binder resin. This quantitative control ensures sufficient UV absorption capability while preventing excessive dye concentration that would compromise adhesive strength and bonding performance.
Solution Approach 2:
The patent applies partial action by using a moderate dye content (not maximum possible concentration) that provides adequate UV blocking performance without over-saturating the adhesive composition. This balanced approach achieves sufficient protection while maintaining adhesive functionality.
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
Effectively blocks ultraviolet light below 410 nm while maintaining high transmittance and adhesion in the visible light region, preventing color changes and ensuring light resistance in display devices.
Implementation Method 1
a light absorbing dye is dispersed in an adhesive binder resin... the light transmittance for a wavelength of 405 nm is 5% or less; the light transmittance for a wavelength of 410 nm is 10% or less
Data Source
AI summary
The present invention discloses an adhesive sheet which effectively blocks light in a ultraviolet region without impairing the transmittance of light in a visible light region and adhesion, an adhesive composition comprising a binder resin, and a light absorbing dye dispersed in the binder resin, and the present invention can effectively block light in a wavelength range of 410 nm or less, and can be applied to various kinds of display devices.