Light Source Device Wavelength Combining for Projector Color Gamut
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Solution Overview
Problem
Current light source devices for projectors using fluorescent materials suffer from luminance saturation and temperature quenching, leading to low light emission efficiency and inability to achieve standardized color gamut and white as per DCI or sRGB standards.
Innovation Solution
A light source device comprising a first light source emitting in a specific wavelength region, a second light source emitting in a different wavelength region, a wavelength conversion unit with a fluorescent material that emits light in a different wavelength region upon irradiation, and a combining unit with wavelength selectivity to combine the lights from both sources, effectively supplementing the emission spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a fluorescent material is used in a light source device, then the service life is extended and speckle noise is reduced, but luminance saturation and temperature quenching occur leading to low light emission efficiency
Solution Approach 1:
The invention divides the light source system into multiple independent light sources (first light source and second light source) emitting at different wavelengths. The first light source excites the fluorescent material while the second light source compensates for efficiency losses, segmenting the functional requirements to overcome the trade-off between service life and light emission efficiency.
2Duration of action of stationary object
If a fluorescent material is used in a light source device, then the service life is extended, but the emission spectrum is insufficient to achieve standardized color gamut and white
Solution Approach 1:
The invention merges the output of two separate light sources with different wavelength characteristics. The first light source (e.g., blue LED) excites the fluorescent material to produce yellow light, while the second light source (e.g., red LED or laser) adds red wavelength component. This combination merges multiple spectral components to achieve complete color gamut coverage and accurate white point while maintaining the long service life of solid-state light sources.
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 results in a high-efficiency light source with improved color reproducibility by combining the lights on the same axis, addressing the deficiencies in emission spectra and enhancing the brightness and color accuracy.
Implementation Method 1
a wavelength conversion unit including a fluorescent material and configured to emit fluorescent emission light in a different wavelength region upon irradiation with the light in the first wavelength region
Data Source
AI summary
There is provided a light source device including a first light source that emits light in a first wavelength region, a second light source that emits light in a second wavelength region different from the first wavelength region, a wavelength conversion unit including a fluorescent material and emits fluorescent emission light in a different wavelength region upon irradiation with the light in the first wavelength region, and a combining unit that has wavelength selectivity to a specific wavelength region corresponding to the second wavelength region and combines the light in the first wavelength region from the first light source, the light in the second wavelength region from the second light source, and the fluorescent emission light which are incident on the combining unit with one another.