Projector Light Source Layout Using Dual Phosphor Beam Combination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Solid-state light sources for projectors, particularly green, yellow, and red light, suffer from poor luminous efficiency and temperature characteristics, making them unsuitable for bright projection applications.
Innovation Solution
A light source device utilizing two laser sources and phosphor wheels with an optical combiner to combine fluorescent beams from different phosphors, allowing for efficient generation and combination of white light beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid-state light sources (LEDs and lasers) are used for green, yellow, and red light, then the projector can be compact and reliable, but the luminous efficiency and temperature characteristics deteriorate
Solution Approach 1:
The invention divides the light generation process into two separate segments: (1) blue laser light sources excite phosphor materials to generate yellow and green light, and (2) red laser light sources directly emit red light. This segmentation allows each component to operate in its optimal performance range, resolving the contradiction between reliability and luminous efficiency for green, yellow, and red light generation.
Solution Approach 2:
The invention changes the operational parameters by using blue laser light (high luminous efficiency) to excite phosphor materials rather than using solid-state light sources directly for green and yellow light. This parameter change enables the system to achieve high luminous efficiency while maintaining reliability through the use of lasers and phosphors with superior temperature characteristics.
2Device complexity
If solid-state light sources are used for green, yellow, and red light, then the device structure can be simplified, but the temperature characteristics and heat generation worsen
Solution Approach 1:
The invention segments the light generation system into blue laser sources with phosphor converters for green and yellow light, and red laser sources for red light. This segmentation enables better thermal management by separating the heat generation sources and allowing optimized cooling strategies for each laser type, thereby improving temperature characteristics while maintaining relatively simple device structure.
Solution Approach 2:
The invention replaces solid-state light sources with laser light sources and phosphor materials, which have superior temperature characteristics and lower heat generation. This substitution maintains device structural simplicity while dramatically improving temperature management and reducing heat-related issues.
3Device complexity
If traditional light source devices are used, then the structure is simple, but the brightness and luminous efficiency deteriorate
Solution Approach 1:
The invention changes the fundamental parameters of light generation by using blue laser light sources (which have high luminous efficiency) to excite phosphor materials for generating yellow and green light, combined with red laser light sources. This parameter change achieves high brightness and luminous efficiency while maintaining a relatively simple overall device structure through the use of compact laser diodes and phosphor materials.
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 compact and efficient light source device that produces bright white light for projectors, addressing the inefficiencies of traditional solid-state light sources.
Implementation Method 1
an optical combiner configured to: reflect or transmit the first excitation beam; and reflect or transmit the second excitation beam
Implementation Method 2
The optical combiner is further configured to: combine the first fluorescent beam and the second fluorescent beam to generate a flux of a combination of the first fluorescent beam and the second fluorescent beam
Implementation Method 3
a first wavelength converter including a first phosphor to which the first excitation beam transmitted through the optical combiner enters and excites the first phosphor to cause the first phosphor to emit a first fluorescent beam
Implementation Method 4
a second wavelength convertor including a second phosphor to which the second excitation beam reflected by the optical combiner enters and excites the second phosphor to cause the second phosphor to emit a second fluorescent beam
Data Source
AI summary
A light source device includes: a first light source configured to emit a first excitation beam; a second light source different from the first light source, a second light source configured to emit a second excitation beam; an optical combiner configured to: reflect or transmit the first excitation beam; and reflect or transmit the second excitation beam; a first wavelength converter including a first phosphor to emit a first fluorescent beam proceeding in a first optical path; and a second wavelength convertor including a second phosphor to emit a second fluorescent beam proceeding in a second optical path. The optical combiner is at a point at which the first optical path of the first fluorescent beam intersects the second optical path of the second fluorescent beam.