Light Source System Using Cyan and Yellow Phosphors for Dual DMD Projection
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Solution Overview
Problem
Conventional DLP projection systems using semiconductor lasers for red phosphor excitation suffer from low conversion efficiency, leading to reduced output image brightness and color gamut due to limitations in red phosphor efficiency.
Innovation Solution
A light source system employing high-efficiency phosphors, such as cyan and yellow phosphors, to generate combined primary color lights, which are then separated and modulated by two DMDs, allowing for adjustable ratios of primary colors and increased color gamut, improving light efficiency and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If red phosphor is used to convert laser light in conventional DLP projection systems, then the system can generate red light, but the conversion efficiency is low leading to reduced output image brightness and color gamut
Solution Approach 1:
The patent changes the wavelength conversion materials from conventional red phosphor to cyan and yellow phosphors with higher conversion efficiencies. This parameter change in material selection directly addresses the low conversion efficiency of red phosphor while improving output brightness and color gamut through the novel wavelength conversion path.
2Loss of energy
If red phosphor is used to convert laser light, then the system can produce red light, but the color gamut is limited due to low conversion efficiency
Solution Approach 1:
The patent changes the wavelength conversion materials from conventional red phosphor to cyan and yellow phosphors with higher conversion efficiencies. This parameter change in material selection directly addresses the low conversion efficiency of red phosphor while improving output brightness and color gamut through the novel wavelength conversion path.
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 system significantly enhances color gamut and light efficiency by distributing primary colors effectively across two DMDs, resulting in improved image brightness and reduced costs.
Implementation Method 1
the light output device includes a cyan phosphor and a yellow phosphor... the cyan phosphor and the yellow phosphor convert the excitation light to generate a cyan light and a yellow light
Implementation Method 2
a beam splitter, configured to separate the cyan light and the yellow light into a first light path and a second light path respectively
Data Source
AI summary
A light source system including: a light source device emitting excitation light; an light output device receiving the excitation light and converting it into converted light, wherein the light output device includes at least two different wavelength conversion materials, the converted light of at least one wavelength conversion material being a multi-color light; a light splitting and combining device splitting the multi-color light into a first and a second color light propagating respectively along a first and a second optical channel, wherein the first and second color lights have different wave spectrum coverage ranges; and a first and a second light modulation device respectively modulating the light propagating over the first and second optical channels, wherein the light of three primary colours can be allocated to two DMDs for processing. This results in improved colour gamut of the light source and the light efficiency and reliability of the system.