Phosphor Wheel Dichroic Filters Light Conversion
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Solution Overview
Problem
The existing phosphor wheel devices in projection image display apparatuses suffer from inefficiencies due to non-100% conversion efficiency of phosphors and transmittance/reflectance losses in filters, leading to reduced performance and maintenance requirements for light source devices.
Innovation Solution
A phosphor wheel device is designed with a substrate, dichroic filters, phosphors, transmission windows, and a diffusion film, where dichroic filters transmit and reflect specific wavelengths, and the diffusion film diffuses incident light to improve conversion efficiency and uniform intensity distribution, reducing losses and enhancing operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If phosphor is used to convert light wavelength, then color components are generated, but conversion efficiency is not 100% causing energy loss
Solution Approach 1:
The patent implements a reflective structure that redirects unconverted light back through the phosphor layer, enabling continuous conversion attempts until the light is converted or escapes. This ensures that energy is not wasted on single-pass failures, thereby improving overall conversion efficiency and reducing energy loss.
Solution Approach 2:
The patent introduces a reflective film as an intermediary element between the light source and the exit aperture. This mediator captures unconverted light and redirects it back through the phosphor, facilitating additional conversion opportunities and reducing direct energy loss.
2Use of energy by moving object
If filter is used to extract color components, then desired wavelengths are obtained, but transmittance is not 100% causing additional energy loss
Solution Approach 1:
The reflective structure enables light that passes through the phosphor without conversion to be redirected back, allowing continuous interaction with the phosphor material. This multi-pass approach increases the probability of wavelength conversion and reduces energy loss from single-pass filtering.
Solution Approach 2:
The patent extracts the filtering function from a separate filter component and integrates it into the phosphor wheel structure itself. By combining the phosphor conversion layer with the reflective and transmission functions in a single integrated component, the system reduces the number of separate energy-loss-inducing interfaces.
3Productivity
If multiple components are added to improve efficiency, then performance increases, but device complexity increases
Solution Approach 1:
The patent merges the phosphor conversion layer, reflective surface, and transmission aperture into a single integrated phosphor wheel structure. This consolidation achieves multiple functions (wavelength conversion, light reflection, and selective transmission) within one component, improving operational efficiency while avoiding the complexity of assembling multiple separate components.
Solution Approach 2:
The phosphor wheel serves multiple functions simultaneously: it acts as the phosphor conversion medium, provides the reflective surface for unconverted light, and defines the transmission aperture for extracted color components. This multi-functionality reduces the need for additional specialized components, thereby improving efficiency without proportionally increasing 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 the efficiency of light source devices and projection image display apparatuses by improving conversion efficiency and reducing unevenness in image light, allowing for higher performance and potentially longer maintenance intervals.
Implementation Method 1
The phosphor is excited by incident light having the first wavelength to generate fluorescence having the second wavelength
Implementation Method 2
The first dichroic filter transmits incident light having a first wavelength, and reflects incident light having a second wavelength different from the first wavelength
Implementation Method 3
The diffusion film is formed on one of the first and second transmission windows, and diffuses incident light
Data Source
AI summary
The first dichroic filter is in a region including a circumference having a first radius, transmits source light and reflects fluorescence. The phosphor is in a region having a predetermined angular width of a region including a circumference having the first radius, and excited by source light to generate fluorescence. The first transmission window is in a region different from the region of the phosphor and transmits incident light. The second dichroic filter is in a region having a predetermined angular width of a region including a circumference having a second radius, and transmits source light and reflects incident light. The second transmission window is in a region different from the second dichroic filter and transmits source light. The diffusion film is on one of the first and second transmission windows, and diffuses incident light.