Light Source Device Using Yellow Phosphor and Blue Laser
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Solution Overview
Problem
Existing light source devices for projectors, particularly those using three-color lasers, face inefficiencies due to the high cost and size issues associated with green and red lasers, which require strong cooling and result in energy loss when attempting to meet digital cinema color gamut standards.
Innovation Solution
A light source device incorporating a yellow phosphor, a red laser light source, and a blue laser light source, with combining units to generate composite light, and a filter to adjust the wavelength, reducing the need for additional corrections and energy loss by utilizing the red laser for color adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If three-color lasers (blue, green, red) are used to achieve high power and meet digital cinema color gamut standards, then the color accuracy and power are improved, but the apparatus becomes expensive and large in size due to the need for strong cooling systems for green and red lasers
Solution Approach 1:
The patent combines a blue laser with a yellow phosphor to generate yellow light, eliminating the need for separate green and red lasers. This merging approach reduces the number of laser sources from three to one (blue laser only), thereby simplifying the cooling system and reducing apparatus size while maintaining high power output through the phosphor conversion mechanism.
Solution Approach 2:
The patent changes the approach from directly using three-color lasers to using a blue laser with wavelength conversion via yellow phosphor. This parameter change in the light generation method allows achieving the required color gamut and power without the complexity of three separate laser systems, thereby reducing apparatus size and cooling requirements.
2Illumination intensity
If three-color lasers are used to meet digital cinema color gamut standards, then the color accuracy is improved, but the cost increases due to the high cost of green and red lasers
Solution Approach 1:
The patent merges the functions of blue, green, and red lasers into a single blue laser system with yellow phosphor conversion. Since blue lasers are relatively inexpensive compared to green and red lasers, this merging strategy significantly reduces the overall cost while maintaining the ability to meet digital cinema color gamut standards through precise wavelength control and phosphor selection.
Solution Approach 2:
The patent replaces expensive green and red lasers with a cheaper blue laser and yellow phosphor combination. This substitution uses a more cost-effective light source (blue laser) that is widely available and inexpensive, thereby reducing the overall system cost while achieving the same functional outcome of meeting color gamut requirements.
3Device complexity
If a yellow phosphor is combined with a blue laser to reduce cost and size, then the apparatus efficiency is improved, but additional filtering is required to meet digital cinema color gamut standards, which impairs efficiency
Solution Approach 1:
The patent optimizes the parameters of the yellow phosphor (such as its emission spectrum, peak wavelength, and bandwidth) to naturally produce light that meets digital cinema color gamut standards without requiring additional filtering. By carefully selecting and tuning the phosphor characteristics, the system achieves compliance with standards while minimizing energy loss and maintaining high efficiency.
Solution Approach 2:
The patent performs preliminary optimization of the yellow phosphor selection and configuration before the light generation process. By pre-selecting phosphors with appropriate spectral characteristics that inherently meet color gamut requirements, the system avoids the need for subsequent filtering operations, thereby eliminating energy loss and maintaining high efficiency throughout the light generation process.
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 configuration enhances energy efficiency by reducing energy loss and apparatus size, achieving a more compact and cost-effective solution for digital cinema applications by eliminating the need for filtering out wavelength bands.
Implementation Method 1
a yellow phosphor that emits yellow fluorescence excited by exciting light
Data Source
AI summary
A light source device capable of improve energy efficiency is provided. A light source device includes a yellow phosphor that emits yellow fluorescence excited by exciting light, a red laser light source that emits red laser light, a first light combining unit that generates first composite light by combining the emitted yellow fluorescence with the emitted red laser light, a blue laser light source that emits blue laser light, and a second light combining unit that generates second composite light by combining the combined first composite light with the emitted blue laser light.