Light Source System with Dichroic Assembly for Color Purity
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Solution Overview
Problem
Current projection technologies face challenges in miniaturization and display effect due to the bulkiness of color wheels and impure fluorescent colors in monolithic spatial light modulators, particularly in dual-color wheel methods and single-color wheel combinations.
Innovation Solution
A light source system incorporating an excitation light source, a wavelength conversion device with a conversion layer, and a dichroic assembly that filters unconverted excitation light, ensuring only converted light is emitted, thereby improving color accuracy and reducing the system's volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a dual-color wheel method or single-color wheel combination is used in monolithic spatial light modulators, then color combination is achieved, but the system becomes bulky and color purity deteriorates due to unfiltered excitation light
Solution Approach 1:
The patent extracts and removes the unconverted excitation light from the optical path using a dichroic assembly, separating it from the converted fluorescent light. This extraction principle eliminates the harmful unconverted light that degrades color accuracy while avoiding the need for bulky color wheels, thus resolving the contradiction between system volume and color accuracy.
Solution Approach 2:
The patent introduces a dichroic assembly as an intermediary component between the wavelength conversion device and the display device. This mediator selectively transmits converted light while reflecting or blocking unconverted excitation light, enabling color purification without requiring large mechanical color wheel assemblies.
2Device complexity
If wavelength conversion is performed without filtering unconverted light, then system simplicity is maintained, but color purity deteriorates
Solution Approach 1:
The dichroic assembly serves as a simple intermediary that automatically separates converted and unconverted light based on wavelength, maintaining optical system simplicity while achieving high color purity through passive optical filtering without complex mechanical structures.
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
This solution enhances the display effect by improving color purity and miniaturizing projection devices, making them suitable for applications like micro-projectors and portable devices.
Implementation Method 1
a conversion layer configured to perform wavelength conversion on at least part of the excitation light to obtain excited light
Implementation Method 2
a dichroic assembly configured to guide the excited light emitted from the conversion layer to propagate along a second optical path, so that the excited light is finally emitted from the light source system along a light-emitting optical path
Data Source
AI summary
Provided is a light source system, including: an excitation light source for emitting excitation light; a wavelength conversion device provided with a conversion layer which is used to perform wavelength conversion on at least a portion of the excitation light to obtain stimulated light, and to exit the stimulated light and the unconverted excitation light; and a dichroic assembly which is used to guide the stimulated light exited from the conversion layer to propagate along the second optical path, and finally to exit from the light source system along the exit optical path, and to guide at least a portion of the unconverted excitation light exited from the conversion layer to transmit on a path, which is not the exit optical path. Further provided is a projection device comprising the above light source system.