Ionic Polymer Light Conversion Film Adhesion and Moisture Resistance
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Solution Overview
Problem
Existing light conversion films using organic fluorescent dyes face challenges with optical property decline due to gluing/adhesive materials and lack of heat and moisture resistance, particularly when used in high-temperature and humidity conditions.
Innovation Solution
A light conversion film is developed with organic fluorescent dyes dispersed in a polymer medium containing ionic polymers, which provides adhesive strength for direct lamination with a barrier film without adhesives, enhancing heat and moisture resistance and maintaining optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a gluing agent/adhesive is coated on a light conversion film including an organic fluorescent dye and a barrier film is laminated thereon, then adhesion between films is improved, but optical properties of the film decline and heat/moisture resistance decreases
Solution Approach 1:
The invention removes the gluing agent/adhesive layer from the film structure. The light conversion film itself is designed to provide sufficient adhesion to the barrier film through its polymer matrix and fluorescent dye composition, eliminating the need for a separate adhesive layer that would compromise optical properties and heat/moisture resistance.
Solution Approach 2:
The invention combines the light conversion function and the adhesion function into a single integrated film structure. The polymer matrix containing organic fluorescent dyes serves both as the light conversion medium and as the adhesive layer that bonds the barrier film, eliminating the need for a separate adhesive layer.
2Productivity
If concentration of organic fluorescent dye is increased to enhance light conversion efficiency, then light conversion efficiency improves, but extinction increases and stability against heat or light decreases
Solution Approach 1:
The invention optimizes the concentration parameter of organic fluorescent dyes within a specific range (0.1-10 wt%) to achieve the best balance between light conversion efficiency and stability. This parameter optimization prevents both extinction at high concentrations and insufficient conversion at low concentrations, while maintaining heat and light stability.
Solution Approach 2:
The invention uses a composite polymer matrix system that provides a stable environment for the organic fluorescent dyes. The polymer matrix protects the dyes from degradation while allowing efficient light conversion, enabling high dye concentration without the usual penalties of extinction and reduced stability.
3Productivity
If nanocrystal fluorescent substance is used to achieve high quantum efficiency and strong fluorescence, then light emission efficiency improves, but raw material cost increases and heat/oxygen resistance decreases
Solution Approach 1:
The invention replaces expensive nanocrystal fluorescent substances with organic fluorescent dyes that are low-cost and can be easily synthesized. While organic dyes were traditionally considered less stable, the invention overcomes this limitation through proper polymer matrix encapsulation and concentration optimization, achieving both cost-effectiveness and adequate stability.
4Reliability
If inorganic fluorescent substance is used to achieve high color purity and excellent stability, then color purity improves, but price increases and light emission efficiency decreases
Solution Approach 1:
The invention changes the chemical composition parameter from inorganic fluorescent substances to organic fluorescent dyes dispersed in a polymer matrix. This parameter change enables better light emission efficiency and lower cost while maintaining adequate stability through the protective polymer environment and optimized dye concentration.
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 film effectively blocks moisture and oxygen penetration, maintaining stable fluorescence properties under high temperature and humidity conditions, and enhances light conversion efficiency without the need for gluing agents, ensuring prolonged useful life.
Implementation Method 1
a light conversion film in which one or more types of organic fluorescent dyes are dispersed in a polymer medium including one or more types of ionic polymers
Implementation Method 2
The film effectively blocks moisture and oxygen penetration
Data Source
AI summary
The present application relates to a light conversion film in which one or more types of organic fluorescent dyes are dispersed in a polymer medium including one or more types of ionic polymers, and a light conversion device, a backlight unit and a display apparatus including the same.