Wavelength Conversion Layer Structure to Prevent Edge Peeling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The adhesiveness between the inorganic layer and the outermost organic layer in quantum dot films can be poor, leading to peeling issues when the film is cut, which affects the reliability of wavelength conversion members used in backlight units and liquid crystal display devices.
Innovation Solution
A wavelength conversion member configuration is developed where the organic layers in contact with the main surfaces of the substrates are formed using a composition containing a polymer A with a glass transition temperature of 50° C. or lower and a polymer B with acryloyl or methacryloyl groups, enhancing adhesiveness and preventing peeling at the edges during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a quantum dot film with inorganic layer and organic layer is used for wavelength conversion, then color reproducibility is improved, but adhesiveness between layers deteriorates causing peeling at cut edges
Solution Approach 1:
The patent changes the chemical composition parameters of the organic layer by incorporating specific functional groups (carboxyl, hydroxyl, or amine groups) to improve adhesiveness. It also optimizes the thickness parameter of the organic layer to be 1 μm or less, and adjusts the mass ratio of polymer components to achieve both good adhesion and color reproduction performance.
Solution Approach 2:
The patent creates a composite structure by combining the inorganic quantum dot layer with an organic layer containing specific polymers and functional groups. This composite material approach allows the organic layer to serve multiple functions: providing adhesion to the inorganic layer, preventing peeling at cut edges, and maintaining optical properties for color reproduction.
2Reliability
If the organic layer is made thinner to prevent peeling, then adhesiveness is improved, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent specifies a precise thickness parameter for the organic layer (1 μm or less) and provides guidance on composition ratios (mass ratio of polymer A to polymer B) to facilitate controlled manufacturing. By optimizing the chemical composition with specific functional groups, the patent enables achieving the required adhesion even at this thin thickness, making precision control more manageable.
3Reliability
If polymer content in organic layer is increased to improve adhesiveness, then peeling resistance is improved, but ease of manufacture deteriorates due to complex composition control
Solution Approach 1:
The patent provides specific parameter ranges for composition control to simplify manufacturing: mass ratio of polymer A to polymer B between 1:4 and 4:1, and content of polymer B between 20-80 mass%. These standardized parameter ranges make it easier to manufacture while maintaining peeling resistance through the presence of functional groups that enhance adhesion.
Solution Approach 2:
The patent focuses the functional groups (carboxyl, hydroxyl, or amine) specifically at the interface between the organic and inorganic layers where adhesion is needed, rather than uniformly distributing all functional components throughout the entire organic layer. This localized functional approach improves peeling resistance while reducing overall composition complexity.
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 configuration effectively suppresses peeling at the edges during cutting, improving the reliability and performance of wavelength conversion members, backlight units, and liquid crystal display devices by enhancing the adhesiveness between layers.
Implementation Method 1
a polymer A having a glass transition temperature of 50° C. or lower
Implementation Method 2
a polymer B having an acryloyl group or a methacryloyl group in a molecule thereof
Data Source
AI summary
A wavelength conversion member suppresses peeling at an edge at cutting; and is used with a backlight unit and a liquid crystal display device. The wavelength conversion member includes a first substrate, a wavelength conversion layer, and a second substrate, in which each of the first and second substrates includes a support, a barrier layer, and an organic layer, where each of the barrier layers contains at least aluminum and phosphorus, each of the organic layers is formed of a composition containing a polymer A having a glass transition temperature of 50° C. or lower and a polymer B having an acryloyl or methacryloyl group in a molecule thereof, and the wavelength conversion layer is a layer in which at least one selected from the group consisting of a quantum dot, a phosphor particle, and a phosphor coloring agent is dispersed in a matrix made of an acrylic resin.