Wavelength Conversion Layer Asymmetry for Blackening Suppression
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Solution Overview
Problem
Conventional light emitting devices with quantum dots in their wavelength conversion layers experience blackening due to light or heat from the source, reducing light emission efficiency, and existing solutions do not address this issue.
Innovation Solution
The wavelength conversion layer with quantum dots is positioned at a greater distance from the light source within a receptacle, and colored layers are applied to the receptacle's surfaces to prevent blackening, maintaining efficient light conversion and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wavelength conversion layer is placed adjacent to the light source, then the light emission efficiency is improved, but blackening occurs in the wavelength conversion layer due to light or heat from the light source
Solution Approach 1:
The patent applies asymmetry by creating an asymmetric distance relationship between the wavelength conversion layer and the light source. Specifically, the distance from the light source to the wavelength conversion layer is made different from the distance from the wavelength conversion layer to the light guide plate, with the wavelength conversion layer being positioned closer to the light guide plate. This asymmetric positioning reduces the exposure of the quantum dots to harmful light and heat from the light source, suppressing blackening while maintaining effective light conversion.
2Object-affected harmful factors
If the wavelength conversion layer is positioned closer to the light guide plate, then blackening is suppressed, but the light emission efficiency may be reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the positional parameter of the wavelength conversion layer within the receptacle. By adjusting the distance ratios between the wavelength conversion layer, light source, and light guide plate, the patent finds an optimal position that balances blackening suppression and light emission efficiency. The specific parameter adjustment involves setting the distance from the light source to the wavelength conversion layer to be greater than the distance from the wavelength conversion layer to the light guide plate.
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 effectively suppresses blackening, enhancing the light emission efficiency of light emitting devices, light source units, and display devices by maintaining the wavelength conversion layer at a suitable distance from the light source.
Implementation Method 1
The wavelength converting member absorbs light having a wavelength of light emitted from the light source and then produces light having a wavelength different therefrom
Implementation Method 2
colored layers are preferably formed on side surfaces connecting the light entrance plane and the light exit plane, on end portions of the light exit plane, or over the side surfaces and the end portions of the light exit plane. Thus colored layers thus provided allows the wavelength converting member to effectively convert the color of light
Data Source
AI summary
To provide a wavelength converting member in which the occurrence of blackening can be suppressed compared to the prior art; and a light emitting device, a light emitting element, a light source unit, and a display device using the wavelength converting member. The wavelength converting member includes: a receptacle including a light entrance plane and a light exit plane opposite to the light entrance plane and provided with a receiving space inside the light entrance plane and the light exit plane; and a wavelength conversion layer having quantum dots that is placed in the receiving space. The distance between the light entrance plane and the wavelength conversion layer is longer than the distance between the light exit plane and the wavelength conversion layer.