Wavelength Conversion Member with Colored Side Layer
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Solution Overview
Problem
Existing wavelength conversion members fail to effectively convert blue light to white light due to light leakage through the side parts of the container, resulting in a hue similar to the light source color, rather than the desired color conversion.
Innovation Solution
A wavelength conversion member with a container having a storage space for the wavelength conversion substance and a colored layer on the side face or end portion of the container, where the wavelength conversion substance contains quantum dots dispersed in a resin with a refractive index lower than the container, and the colored layer is formed using paint, ink, or tape to suppress light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple cylindrical container is used to seal the wavelength conversion substance, then the device complexity is reduced and ease of manufacture is improved, but light leakage occurs through the side parts resulting in poor color conversion efficiency
Solution Approach 1:
The patent applies local quality by making the container body opaque while keeping the bottom transparent. This allows the side walls to block light leakage locally, while the bottom remains optically functional for light entry and emission. The selective transparency resolution resolves the contradiction by providing the needed light blocking function without compromising the overall simplicity of the container structure.
Solution Approach 2:
The patent introduces a light-blocking layer as an intermediary element within the container structure. This layer, positioned between the wavelength conversion substance and the side wall, effectively blocks light leakage without requiring complete opacity of the entire container. It resolves the contradiction by providing precise light control while maintaining manufacturing simplicity.
2Manufacturing precision
If the container is made opaque to prevent light leakage, then color conversion efficiency is improved, but light emission intensity is reduced
Solution Approach 1:
The patent applies local quality by making the container body opaque while keeping the bottom transparent. This allows the side walls to block light leakage locally, while the bottom remains optically functional for light entry and emission. The selective transparency resolution resolves the contradiction by providing the needed light blocking function without compromising the overall simplicity of the container structure.
3Manufacturing precision
If quantum dots are used as wavelength conversion substance, then color conversion precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by carefully controlling the particle size of quantum dots (1-50 nm range) and their concentration (0.1-10 wt%) in the wavelength conversion substance. By optimizing these parameters, the patent achieves high color conversion precision while maintaining compatibility with standard manufacturing processes, thus resolving the contradiction between precision and 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
This configuration enhances color conversion efficiency and light emission intensity, achieving a desired color closer to white light with reduced power consumption and improved reliability in light-emitting apparatuses and display devices.
Implementation Method 1
the wavelength conversion substance absorbs blue light of the light source and converts part of the blue light to red light or green light
Implementation Method 2
a colored layer formed on the side face, an end portion of the second surface or from the side face to the end portion of the second surface
Data Source
AI summary
It is an object of the present invention to provide a wavelength conversion member capable of appropriately performing color conversion compared to the prior arts and a light-emitting apparatus, a light-emitting element, a light source apparatus, and a display apparatus using the wavelength conversion member. A wavelength conversion member of the present invention includes a light incident surface, a light emission surface and a side face that connects between the light incident surface and the light emission surface, and includes a container provided with a storage space inside the side face, a wavelength conversion substance that fills the inside of the storage space and a colored layer formed on the side face.