Stacked Fluorescent Light Source for Projector Color Gamut
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Solution Overview
Problem
Existing light sources for projectors face challenges in balancing emission spectra for red, green, and blue wavelength regions, leading to inefficiencies and poor color reproducibility, particularly in achieving standard color gamuts like DCI and sRGB.
Innovation Solution
A light source apparatus utilizing a wavelength conversion member with a first and second fluorescent substance, where the first substance emits light in a second wavelength region upon excitation, and the second substance, stacked on top, emits light in a third wavelength region, effectively enhancing color reproducibility and efficiency by adjusting the emission spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fluorescent substance is used for wavelength conversion, then the device complexity is reduced, but the color reproducibility and emission spectrum balance deteriorate
Solution Approach 1:
The wavelength conversion member is segmented into multiple fluorescent substance layers, each responsible for converting light to specific wavelength regions. This segmentation allows independent optimization of each layer's emission characteristics, enabling precise control over the overall emission spectrum and improving color reproducibility while maintaining manageable device complexity
Solution Approach 2:
The patent uses composite fluorescent materials with different emission characteristics stacked in specific arrangements. By combining multiple fluorescent substances with complementary emission spectra, the system achieves balanced red, green, and blue wavelength region emissions, thereby improving color reproducibility without excessively increasing device complexity
2Manufacturing precision
If multiple fluorescent substances are stacked to improve color reproducibility, then the emission spectrum balance improves, but the device complexity increases
Solution Approach 1:
The patent transitions from a single-layer to a multi-layer stacked structure, adding the vertical dimension to the wavelength conversion member design. This dimensional change enables sophisticated spectral control through layered fluorescent substances while maintaining a compact overall structure, thus improving emission spectrum balance without proportionally increasing device complexity
3Duration of action of stationary object
If fluorescent substances are used for wavelength conversion, then the lifetime is improved compared to mercury lamps, but the emission spectrum balance and color reproducibility deteriorate
Solution Approach 1:
The patent employs composite fluorescent materials with carefully selected emission characteristics that complement each other. By stacking fluorescent substances that emit in different wavelength regions (red, green, blue), the system achieves balanced color reproduction while maintaining the long lifetime advantage of solid-state fluorescent 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 high-efficiency light source with improved color reproducibility, capable of producing standard colors and white light by optimizing the emission spectra of red, green, and blue components.
Implementation Method 1
a first fluorescent substance, and a second fluorescent substance, wherein the first fluorescent substance is excited by light in a first wavelength region to emit light in a second wavelength region
Implementation Method 2
the second fluorescent substance is excited by light in the first wavelength region and light in the second wavelength region to emit light in a third wavelength region
Data Source
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AI summary
[Object] To implement a light source apparatus that is high in efficiency and has favorable color reproducibility. [Solution] There is provided a light source apparatus including: a light source configured to output light in a first wavelength region; and a wavelength conversion member including a first fluorescent substance and a second fluorescent substance, the first fluorescent substance being excited by the light in the first wavelength region to emit light in a second wavelength region, the second fluorescent substance being stacked on the first fluorescent substance and excited by the light in the first wavelength region and the light in the second wavelength region to emit light in a third wavelength region.