Light Source Module Wavelength Conversion Wheel Color Gamut
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional projection apparatuses face challenges in achieving a broader color gamut while minimizing optical energy loss, particularly due to the inefficiencies in using phosphor powders and filter wheels to generate green light beams.
Innovation Solution
A light source module comprising a blue light source, a red light source, a wavelength conversion wheel, and a filter wheel, where the wavelength conversion wheel converts the blue light beam into a green light beam, and the filter wheel allows both green and red light beams to pass through specific bandwidths, reducing energy loss and enhancing color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a phosphor wheel and filter wheel are used to generate green light beam, then the color gamut is improved, but optical energy loss increases
Solution Approach 1:
The patent extracts the green light generation process from the conventional phosphor wheel system and implements it using a separate blue light source combined with a green phosphor layer on the DMD chip. This extraction allows the green light to be generated directly at the modulation point, eliminating the need for green filters and reducing optical energy loss while maintaining color gamut requirements
Solution Approach 2:
The patent introduces a green phosphor layer as an intermediary material on the DMD chip surface. This phosphor layer converts the blue light from the blue light source into green light through photoluminescence, serving as an efficient mediator that directly produces the required green light beam without the energy losses associated with conventional filter-based methods
2Adaptability or versatility
If a red solid-state light source is added to provide red light beam, then the color gamut is improved, but the device complexity increases
Solution Approach 1:
The patent merges the red light source integration with the existing blue light source system by positioning both light sources to illuminate the same DMD chip. The red light source is combined with the blue light source optical paths, and both light beams are modulated by the same DMD chip, simplifying the overall device structure while achieving broader color gamut
Solution Approach 2:
The DMD chip serves multiple functions in this patent: it acts as the modulation element for both blue and red light beams, and its surface green phosphor layer simultaneously serves as both a color conversion element for blue light and a reflective element for red light. This multi-functionality reduces device complexity while maintaining enhanced color performance
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 solution enables a broader color gamut and reduces optical energy loss, resulting in improved color performance and efficiency in projection apparatuses.
Implementation Method 1
The wavelength conversion wheel is disposed on a transmission path of the blue light beam and has a first wavelength conversion region and a transparent region. The blue light beam passes through the transparent region. The blue light beam is converted by the first wavelength conversion region to generate a green light beam.
Implementation Method 2
The filter wheel is disposed on transmission paths of the blue light beam and the red light beam. The filter wheel includes a first filter region and a diffusion region. A filter spectrum of the first filter region includes a first bandwidth allowing the green light beam to pass through and a second bandwidth allowing the red light beam to pass through.
Data Source
AI summary
A light source module and a projection apparatus are provided. The light source module includes a blue light source, a red light source, a wavelength conversion wheel and a filter wheel. The blue light source provides a blue light beam. The red light source provides a red light beam. The wavelength conversion wheel is disposed on a transmission path of the blue light beam and has a wavelength conversion region and a transparent region. The blue light beam passes through the transparent region. The blue light beam is converted into a green light beam by the wavelength conversion region, so as to generate the green light beam. The filter wheel is disposed on transmission paths of the blue light beam and the red light beam and includes a filter region and a diffusion region. A filter spectrum of the filter region includes a first bandwidth that allows the green light beam to pass through and a second bandwidth that allows a red light beam to pass through. The first bandwidth and the second bandwidth are separated with each other. The blue light beam passes through the diffusion region. The light source module and the projection apparatus including the same have a broad color gamut and are able to reduce loss of energy.