Light Source Module Wide Gamut Projection Fluorescence Wheel
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Solution Overview
Problem
Current projection devices require multiple color wheels for wider gamut performance, increasing cost and technical complexity, and suffer from energy loss and poor color quality due to larger facula formation and spoke light issues.
Innovation Solution
A light source module with a blue light source, a red light source, a wavelength conversion device, and a wavelength selection element, where the wavelength conversion device converts the blue beam into a green beam, and the wavelength selection element filters it to produce a wide gamut illumination beam, eliminating the need for a filter color wheel and reducing energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple color wheels are used to achieve wider gamut performance, then color gamut is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the filter color wheel from the traditional dual-color-wheel system, retaining only the fluorescence wheel. This simplification maintains wide gamut performance by using the fluorescence wheel to generate green and yellow beams, while removing the complex filtering mechanism that caused synchronization issues and increased device complexity.
Solution Approach 2:
The fluorescence wheel is designed to perform multiple functions: it converts blue light to green beams and yellow beams simultaneously, replacing the need for separate filter wheels. This multi-functional approach achieves wide color gamut while reducing the number of components required.
2Adaptability or versatility
If multiple color wheels are used for wide gamut, then color performance is improved, but manufacturing cost increases
Solution Approach 1:
By removing the filter color wheel from the system, the patent reduces the number of precision-manufactured components that need to be assembled and synchronized. This extraction of the filtering function significantly lowers manufacturing complexity and cost while maintaining wide gamut capability through the fluorescence wheel's conversion capabilities.
3Measurement precision
If filter color wheel is used for wavelength selection, then color selection is achieved, but energy loss occurs and spoke light is formed
Solution Approach 1:
Instead of using absorption-based filtering that causes energy loss and spoke light artifacts, the patent employs fluorescence conversion that transforms blue light into green and yellow beams. This conversion process is more efficient and eliminates the harmful spoke light effect while maintaining color purity through the optical properties of the phosphor materials.
4Measurement precision
If filter color wheel is used for wavelength selection, then color filtering is achieved, but color quality deteriorates due to spoke light
Solution Approach 1:
The patent removes the filter color wheel that generates spoke light artifacts, eliminating this harmful effect at its source. The fluorescence wheel-based system produces smooth color transitions without the spoke light problem, while maintaining color purity through the inherent optical properties of the phosphor conversion process.
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 provides a cost-effective, energy-efficient wide gamut projection device with improved color purity by using a single fluorescence wheel for filtration, avoiding spoke light issues and enhancing color performance.
Implementation Method 1
The wavelength conversion device has at least one wavelength conversion area and at least one light penetrating area, and the at least one wavelength conversion area and the at least one light penetrating area cut into the transmission path of the blue beam by turns. The at least one light penetrating area is configured to allow the blue beam to pass therethrough, and the at least one wavelength conversion area is configured to convert the blue beam into a converted beam.
Data Source
AI summary
The invention discloses a light source module, a projection device and driving methods thereof, wherein 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.