Recessed Phosphor Wheel Structure for Heat-Induced Defect Prevention
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Solution Overview
Problem
Existing projectors using semiconductor light sources generate heat in the phosphor layer, leading to defects such as discoloration, cracking, and deterioration of brightness performance, which reduces the reliability and lifespan of the phosphor layer.
Innovation Solution
A phosphor wheel design featuring a substrate with a recess and a first reflective layer surrounding it, made of materials with high thermal conductivity, such as copper, to dissipate heat efficiently, and a second reflective layer and thermal radiation layer to enhance light reflectance and dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high-powered light source is used to generate sufficient light output, then the brightness performance is improved, but heat is generated in the phosphor layer causing defects such as discoloration or cracking
Solution Approach 1:
The phosphor layer is extracted from direct contact with the high-powered light source by placing it in a recess, separating the light generation function from the heat-generating function to prevent direct thermal damage
Solution Approach 2:
A heat radiation layer is introduced as an intermediary between the phosphor layer and the external environment to facilitate heat dissipation, preventing heat accumulation that causes discoloration and cracking
2Productivity
If the phosphor layer is exposed to high temperature heat, then the light generation efficiency is improved, but the brightness performance deteriorates due to heat-induced defects
Solution Approach 1:
The substrate is designed with high thermal conductivity properties specifically at the heat dissipation interface to locally improve heat transfer capability, allowing efficient heat removal from the phosphor layer without compromising overall light generation efficiency
Solution Approach 2:
The heat radiation layer converts the harmful heat energy into beneficial thermal radiation that is efficiently dissipated to the external environment, preventing heat-induced brightness deterioration while maintaining light generation efficiency
3Ease of manufacture
If the substrate surface is exposed to high-temperature heat during phosphor material curing, then the phosphor layer formation is enabled, but surface oxidation occurs reducing reliability
Solution Approach 1:
A protective coating layer is introduced as an intermediary between the substrate surface and the high-temperature heat during phosphor material curing, preventing surface oxidation while enabling successful phosphor layer formation
Solution Approach 2:
The protective coating creates an inert barrier environment around the substrate surface during high-temperature processing, preventing oxidation reactions and ensuring long-term reliability
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 design prevents surface oxidation, maintains brightness performance, and improves light efficiency by effectively dissipating heat, ensuring high reliability and a longer lifespan of the phosphor layer.
Implementation Method 1
by forming the substrate as a material with excellent thermal conductivity, the heat generated in the phosphor layer can be easily dissipated to the outside through the substrate
Implementation Method 2
since the first reflective layer covers the substrate, the surface of the substrate may be oxidized by high-temperature heat generated when the phosphor material is cured
Implementation Method 3
since the heat radiation layer is disposed under the substrate, there is an advantage in that heat transferred to the substrate can be more efficiently discharged to the outside
Data Source
AI summary
A phosphor wheel comprising: a substrate having a recess, a phosphor layer disposed in the recess, and a first reflection layer surrounding the substrate. Thus, heat emission efficiency is increased, and it is possible to prevent defects such as cracking or discolouration of the phosphor layer.