Dual Blue Light Source Segmentation for Projection Efficiency
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Solution Overview
Problem
Conventional projection apparatuses using semiconductor light emitting devices face challenges in achieving high light emission efficiency in the green wavelength range while maintaining color reproducibility in the blue wavelength range, as the blue wavelength range required for exciting fluorescent materials does not support standard chromaticity standards like sRGB, leading to deteriorated light emission efficiency.
Innovation Solution
A light source apparatus comprising a red light source, a first blue-light source emitting in a wavelength range suitable for exciting fluorescent materials, a fluorescent material that emits green light, a second blue-light source emitting in a longer blue-wavelength range corresponding to standard blue in sRGB, and an optical system guiding the lights in a unique optical path to improve light emission efficiency and color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a blue light source with wavelength suitable for exciting fluorescent material is used, then light emission efficiency of green light is improved, but color reproducibility in blue wavelength range deteriorates
Solution Approach 1:
The blue light source is segmented into two distinct sources: a first blue light source with wavelength suitable for exciting fluorescent material (improving green light emission efficiency) and a second blue light source with wavelength supporting sRGB chromaticity standards (maintaining color reproducibility). This segmentation allows each source to optimize for its specific function without compromise.
Solution Approach 2:
The light source apparatus achieves multi-functionality by combining two blue light sources with different wavelength characteristics, enabling the system to simultaneously achieve high green light emission efficiency through fluorescent material excitation and maintain accurate blue color reproduction for sRGB standards.
2Manufacturing precision
If a blue light source with wavelength supporting sRGB chromaticity standards is used, then color reproducibility in blue wavelength range is improved, but light emission efficiency of green light deteriorates
Solution Approach 1:
The blue light source is segmented into two distinct sources: a first blue light source with wavelength suitable for exciting fluorescent material (improving green light emission efficiency) and a second blue light source with wavelength supporting sRGB chromaticity standards (maintaining color reproducibility). This segmentation allows each source to optimize for its specific function without compromise.
3Device complexity
If a single blue light source is used to excite fluorescent material, then device complexity is reduced, but both light emission efficiency and color reproducibility cannot be simultaneously optimized
Solution Approach 1:
The blue light source is segmented into two distinct sources: a first blue light source with wavelength suitable for exciting fluorescent material (improving green light emission efficiency) and a second blue light source with wavelength supporting sRGB chromaticity standards (maintaining color reproducibility). This segmentation allows each source to optimize for its specific function without compromise.
Solution Approach 2:
The light source apparatus achieves multi-functionality by combining two blue light sources with different wavelength characteristics, enabling the system to simultaneously achieve high green light emission efficiency through fluorescent material excitation and maintain accurate blue color reproduction for sRGB standards.
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 enhances light emission efficiency in the green wavelength range and improves color reproducibility in the blue wavelength range by using a combination of red, first blue, and second blue light sources with an optical system, allowing for better projection of images that meet standard chromaticity standards.
Implementation Method 1
a fluorescent material which receives the light in the first blue-wavelength range and emits light in a green wavelength range
Data Source
AI summary
A light source unit includes a red light source, a first blue-light source, a fluorescent material, a second blue light source and an optical system. The red light source emits light in red wavelength range. The first blue-light source emits light in a first blue-wavelength range. The fluorescent material receives the light in the first blue-wavelength range and emits light in a green wavelength range. The second blue-light source emits light in a second blue-wavelength range whose wavelengths are longer than those in the first blue-wavelength range. An optical system guides the light emitted from the red light source, the light emitted from the second blue-light source, and the light emitted from the fluorescent material, along a unique optical path.