Color Filter Light Transmission Layer Outgas Blocking
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Solution Overview
Problem
Conventional color filters using quantum dots face issues with light-emitting efficiency and color purity due to absorption of light and post-bake processes, leading to reduced color reproduction and image quality.
Innovation Solution
A color filter design incorporating a wavelength conversion layer with quantum dots, a light transmission layer, and a wavelength filter layer, where the light transmission layer blocks outgas and enhances light retention, improving light-emitting efficiency and color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional color filter using pigment dispersion is used, then the color filter can be manufactured, but light is absorbed by the color filter resulting in deterioration of light efficiency and color reproduction
Solution Approach 1:
The patent changes the material parameter from conventional pigment dispersion to quantum dot material, which has different optical properties. The quantum dots convert light wavelength more efficiently with less absorption loss, thereby improving both light efficiency and color reproduction simultaneously
Solution Approach 2:
The patent uses a composite structure combining quantum dots with a resin matrix to form the color filter layer. This composite material approach allows the quantum dots to maintain their superior optical properties while being integrated into a manufacturable filter structure
2Reliability
If quantum dots are used as light-emitting materials for a color filter, then light emission waveform is narrowed and color reproduction capacity is improved, but blue light mixes with self-emission light of red and green pixel layers resulting in deterioration of color purity
Solution Approach 1:
The patent divides the color filter into separate pixel layers (red, green, blue) with each layer containing quantum dots of specific wavelengths. This segmentation prevents mixing of different color lights and maintains color purity while preserving the high color reproduction capacity of quantum dots
Solution Approach 2:
The patent applies different quantum dot materials with specific emission wavelengths to different pixel regions. Each pixel layer has locally optimized quantum dot properties matched to its intended color output, ensuring high color purity in each region while maintaining overall color reproduction capacity
3Reliability
If quantum dots are used in a color filter, then high color reproduction and brightness properties are achieved, but quantum dots are influenced by post-bake process at high temperature resulting in deterioration of light-emitting efficiency and light retention rate
Solution Approach 1:
The patent performs preliminary protective actions by optimizing the resin composition and curing conditions before the post-bake process. The resin is selected and formulated to provide a protective environment for quantum dots during subsequent high-temperature processing, preventing degradation before it occurs
Solution Approach 2:
The patent introduces a specially formulated resin as an intermediary material between the quantum dots and the high-temperature environment. This resin acts as a protective medium that allows the quantum dots to withstand the post-bake process without direct thermal damage, preserving their light-emitting efficiency
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 proposed color filter achieves high color reproductivity and excellent light-emitting efficiency while preventing the deterioration of quantum dot performance during high-temperature processes, resulting in improved image display quality.
Implementation Method 1
a wavelength conversion layer which converts the wavelength of light
Implementation Method 2
the light transmission layer transmits a light moving between the wavelength conversion layer and the wavelength filter layer
Data Source
AI summary
Disclosed are a color filter including a wavelength conversion layer which converts the wavelength of light, a light transmission layer formed on the wavelength conversion layer, and a wavelength filter layer formed on the light transmission layer, and an image display device. The light transmission layer transmits a light moving between the wavelength conversion layer and the wavelength filter layer and blocks the flow of outgas. The color filter includes the light transmission layer which transmits a light moving between the wavelength conversion layer and the wavelength filter layer and blocks the flow of outgas, thereby capable of achieving high color reproductivity while having excellent light-emitting efficiency and light retention rate.