Light Source Module Single Fluorescence Wheel Wide Gamut
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Solution Overview
Problem
Current projection devices require multiple color wheels for achieving a wider gamut, leading to increased cost, technical complexity, and energy loss, as well as poorer color quality due to spoke light issues and energy loss during excitation and filtration.
Innovation Solution
A light source module comprising a blue light source, a red light source, a wavelength conversion device, and a wavelength selection element, which converts the blue beam into a green beam using a fluorescence wheel and filters it without a filter color wheel, allowing for different display modes like wide gamut and high brightness with reduced energy loss and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two or more color wheels are used to achieve wider gamut, then color performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the functions of multiple color wheels into a single integrated color wheel structure. The first color wheel includes both first color conversion areas (for converting blue light to green) and second color conversion areas (for converting blue light to yellow), eliminating the need for separate fluorescence wheels and filter color wheels. This merging reduces device complexity while maintaining wide gamut color performance.
Solution Approach 2:
The single color wheel performs multiple functions simultaneously: it acts as both a fluorescence conversion element and a color filtering element through its different color conversion areas. The first color conversion areas convert blue light to green, while the second color conversion areas convert blue light to yellow, allowing one component to replace what previously required multiple specialized components.
2Illumination intensity
If two or more color wheels are used for wide gamut, then color gamut is improved, but energy loss increases
Solution Approach 1:
The patent extracts and eliminates the separate filter color wheel component from the traditional two-wheel system. By using only a fluorescence wheel with different color conversion areas, the system removes the energy loss associated with light filtration while maintaining the ability to produce multiple colors through selective fluorescence conversion.
Solution Approach 2:
The continuous rotation of the single color wheel with multiple color conversion areas ensures continuous production of different colored light beams without the energy losses associated with switching between multiple discrete wheels. The blue light source continuously excites different phosphor materials as they pass through the optical path, maintaining efficient energy conversion throughout the cycle.
3Measurement precision
If filter color wheel is used for color selection, then color accuracy is improved, but spoke light issues occur reducing color purity
Solution Approach 1:
The patent converts the potential harm of spoke light by using fluorescence conversion areas with optimized geometric arrangements. The first and second color conversion areas are positioned and sized to minimize spoke light generation while maximizing color conversion efficiency. The fluorescence wheel design inherently reduces spoke light compared to traditional filter wheels because the phosphor materials convert light wavelengths rather than simply filtering them, reducing the intensity of unwanted light artifacts.
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 wide gamut projection with improved color purity and reduced energy loss by using a single fluorescence wheel, lowering costs and avoiding spoke light issues, while allowing for various display modes to meet user needs.
Implementation Method 1
a blue beam emitted from the blue light source excites phosphor powder that is disposed on a fluorescence wheel and that can be converted into green beams or yellow beams
Implementation Method 2
The green beam passes through a green filter of a filtering wheel to generate a green beam that meets requirements
Data Source
AI summary
A light source module and a projection device including the same are provided. A wavelength conversion device of the light source module has at least one wavelength conversion area for converting a blue beam provided by a blue light source into a converted beam, and the converted beam is transmitted to a wavelength selection element so that a first green beam is obtained by the wavelength selection element from at least a portion of the converted beam. According to the blue light source, a red light source, the wavelength conversion device and the wavelength selection element, the light source module provides an illumination beam corresponding to a first display mode or a second display mode.