Light Source Unit Transparent Grains Phosphor Ratio Control
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Solution Overview
Problem
Existing light source units with fluorescent structures, such as phosphor wheels, face challenges in adjusting the ratio between fluorescence and transmitted light, limiting their ability to achieve desired color temperatures and display performance.
Innovation Solution
Incorporating a transparent coating layer or transparent grains within the fluorescent structure allows for adjustment of the distance and volume of phosphors, enabling flexible control over the ratio of fluorescence to transmitted light, thereby achieving a desired white point without the use of binders, which can lead to thermal stress and reduced light resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If binders are used to fix phosphors to substrates, then phosphors can be securely attached, but thermal stress and reduced light resistance occur
Solution Approach 1:
The invention removes the binder component from the phosphor wheel structure. Phosphors are fixed directly to the substrate without any binder material, eliminating the source of thermal stress and light resistance problems while maintaining secure attachment through direct contact and mechanical fixation methods.
2Illumination intensity
If phosphor volume and layer thickness are increased to enhance fluorescence, then color temperature control improves, but the ratio adjustment between fluorescence and transmitted light becomes limited
Solution Approach 1:
The phosphor wheel is divided into multiple independent phosphor regions with different phosphor materials and concentrations. This segmentation allows each region to contribute differently to the overall fluorescence output, enabling flexible adjustment of the fluorescence-to-transmitted light ratio while maintaining desired color temperatures through selective region activation or rotation.
Solution Approach 2:
Different regions of the phosphor wheel are assigned different phosphor types, concentrations, or layer thicknesses to create local variations in fluorescence characteristics. This allows precise control over the fluorescence-to-transmitted light ratio by adjusting which regions are active or by changing the rotation speed to vary the effective phosphor exposure.
3Manufacturing precision
If phosphor concentration and layer thickness are adjusted to control color temperature, then white point accuracy improves, but manufacturing complexity increases
Solution Approach 1:
The phosphor wheel is divided into multiple segments or regions, each containing phosphors with specific characteristics. This segmentation allows for standardized manufacturing of individual regions that can be assembled into the complete wheel, simplifying the overall manufacturing process while maintaining precise white point control through the coordinated operation of different phosphor regions.
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 approach enhances the reliability and light utilization efficiency of the light source unit, offering superior display performance by allowing for precise adjustment of the fluorescence and transmitted light ratio, expanding material choices for substrates, and improving heat dissipation.
Implementation Method 1
A portion of excitation light having entered the fluorescent structure is absorbed by the phosphors and is converted into fluorescence, whereas a remaining portion of the excitation light passes through the fluorescent structure without undergoing the conversion (transmitted light).
Data Source
AI summary
A light source unit includes a light source section and a fluorescent structure. The fluorescent structure includes a fluorescent part where light from the light source section enters. The fluorescent part includes a transparent grain in addition to a plurality of phosphors.