Wavelength Conversion Filter Module Eliminates Filter Wheel
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Solution Overview
Problem
Current laser projection devices require a filter wheel to achieve desired color specifications, which increases costs and complexity and results in color cast due to divergent beam emission from the phosphor wheel, affecting image color performance.
Innovation Solution
A wavelength conversion filter module with a carrier and wavelength conversion filter unit that includes a filter reflective device and wavelength conversion device, allowing specific color beams to pass through while absorbing or reflecting other colors, eliminating the need for a filter wheel by providing high color purity through the use of optical regions and filter devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a filter wheel is used to achieve desired color specifications, then color performance can be improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the filtering function from a mechanical filter wheel and integrates it directly into the phosphor wheel structure by coating filter materials on the phosphor wheel surface. This eliminates the separate filter wheel component while maintaining color specification requirements.
Solution Approach 2:
The patent merges the phosphor conversion function and the wavelength filtering function into a single integrated wheel structure. The phosphor wheel now performs both phosphor conversion and color filtering simultaneously, reducing system complexity.
2Manufacturing precision
If a filter wheel is used to achieve desired color specifications, then color performance can be improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple functions (phosphor conversion and wavelength filtering) into a single component that can be manufactured as one integrated unit, reducing the total number of parts and assembly steps, thereby lowering manufacturing cost.
Solution Approach 2:
The patent uses composite material structures by coating filter materials on the phosphor wheel, creating a multi-functional material layer that achieves both phosphor conversion and color filtering in a single manufacturing process.
3Area of stationary object
If the beam emitted by the phosphor wheel is divergent, then the area of spoke light formed on the filter wheel is greater, but color cast occurs affecting image color performance
Solution Approach 1:
The patent removes the separate filter wheel component that caused color cast issues, and instead integrates the filtering function directly onto the phosphor wheel surface, eliminating the problem of divergent beam color cast while maintaining adequate light area.
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 wavelength conversion filter module achieves high color purity and omits the filter wheel, enabling the illumination system to meet color specifications without the complexity and cost of a filter wheel, while also providing effective heat dissipation and improved beam control.
Implementation Method 1
The wavelength conversion device is suitable for converting the excitation beam into a conversion beam. The conversion beam includes a specific color beam and a color beam other than the specific color beam.
Implementation Method 2
The filter reflective device is suitable for reflecting the specific color beam and absorbing the color beam other than the specific color beam.
Implementation Method 3
The filter reflective device is suitable for reflecting the specific color beam and absorbing the color beam other than the specific color beam.
Implementation Method 4
The first filter device is suitable for allowing the excitation beam incident on the wavelength conversion filter unit to pass through... The first filter device is suitable for allowing the specific color beam to pass through and reflecting a color beam other than the specific color beam and the excitation beam.
Data Source
AI summary
A wavelength conversion filter module and an illumination system are provided. The wavelength conversion filter module includes a carrier and a wavelength conversion filter unit. The wavelength conversion filter unit is located in a wavelength conversion filter region of the carrier, and the wavelength conversion filter unit includes a filter reflective device, a wavelength conversion device, and a first filter device disposed on the carrier in order. The first filter device is suitable for allowing the excitation beam to pass through. The wavelength conversion device is suitable for converting the excitation beam into a conversion beam. The conversion beam includes a specific color beam and a color beam other than the specific color beam. The filter reflective device is suitable for reflecting the specific color beam and absorbing the color beam other than the specific color beam. The reflected specific color beam passes through the first filter device.