Phosphor Wheel Reflective Luminous Layer Thermal Conductivity
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Solution Overview
Problem
Existing image projection devices face challenges in achieving high light conversion efficiency and thermal conductivity due to heat dissipation constraints when increasing the thickness or content of phosphors in phosphor wheels.
Innovation Solution
A phosphor wheel design that includes a substrate with a reflective luminous layer composed of a resin and a phosphor with higher thermal conductivity than the resin, along with titanium dioxide (TiO2), which enhances light conversion efficiency and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the thickness or content of phosphor is increased to improve light conversion efficiency, then brightness is improved, but heat dissipation becomes constrained leading to reliability issues
Solution Approach 1:
The patent applies composite materials by combining phosphor particles with a resin matrix to form a phosphor layer. This composite structure allows optimization of both light conversion efficiency (through phosphor composition and thickness) and heat dissipation (through resin selection and thermal conductivity enhancement), resolving the contradiction between brightness improvement and heat dissipation reliability.
2Use of energy by moving object
If the thickness of phosphor layer is increased to improve conversion efficiency, then light output efficiency is improved, but heat increase occurs leading to reliability issues
Solution Approach 1:
The resin acts as an intermediary material between the phosphor particles and the heat dissipation path. By selecting resins with appropriate thermal conductivity properties, the patent enables efficient heat transfer from the phosphor layer while maintaining the necessary phosphor thickness for high light output efficiency, thus resolving the contradiction between energy conversion and temperature control.
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 solution improves light conversion efficiency and thermal conductivity, enabling high-efficiency light output and improved color purity while mitigating heat-related reliability issues.
Implementation Method 1
a phosphor layer disposed on the reflective luminous layer... A part of blue light incident on the phosphor layer may be incident on the yellow phosphor layer for outputting the yellow light
Implementation Method 2
the reflective luminous layer includes a resin and a phosphor having a higher thermal conductivity than the resin
Implementation Method 3
the reflective luminous layer may further include titanium dioxide (TiO2)
Data Source
AI summary
An image projection device and an image projection device comprising the same are disclosed. A phosphor wheel according to an embodiment of the present disclosure comprises a substrate, a reflective light-emission layer disposed on the substrate, and a phosphor layer disposed on the reflective light-emission layer, wherein the reflective light-emission layer includes resin and a phosphor having a higher heat conductivity than that of the resin. Accordingly, high-efficiency light output and color purity improvement are possible.