Projector Laser Light Source Phosphor Conversion
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Solution Overview
Problem
The manufacturing of projector laser light sources with six primary light sources is challenging due to the scarcity of suitable light sources for the red and green laser light sources, making it difficult to achieve the required non-overlapping spectra.
Innovation Solution
The use of a yellow phosphor layer and a green phosphor layer to replace the red and green laser light sources, combined with a specific optical path design involving lenses and reflectors, allows for the generation of the necessary primary light sources with reduced volume and complexity, utilizing only two blue laser light sources and one red laser source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If six primary light sources are used to provide wider color gamut and 3D imaging, then image quality and color performance are improved, but device volume and structural complexity increase
Solution Approach 1:
The patent combines multiple laser light sources (blue, cyan, green, yellow-green, red) into a single integrated laser light source assembly. By merging these light sources and using optical components like dichroic mirrors and phosphor conversion elements, the system achieves six primary color output within a compact structure, resolving the contradiction between color gamut expansion and device volume increase.
Solution Approach 2:
The laser light source is designed to serve multiple functions: it provides six primary light sources for wide color gamut, enables 3D imaging through left and right eye separation, and maintains compact form factor. The optical system universally handles multiple wavelengths and color channels through a single integrated path, allowing one device to achieve what would traditionally require multiple separate components.
2Illumination intensity
If six primary light sources with non-overlapping spectra are used, then image realism and layering are improved, but manufacturing difficulty increases due to scarcity of suitable light sources
Solution Approach 1:
The patent uses phosphor conversion to change the wavelength parameters of laser light. Blue lasers are converted to yellow-green light through phosphor materials, and cyan lasers are converted to green light. This parameter transformation approach allows the system to generate six primary colors from fewer laser sources, significantly easing manufacturing constraints while maintaining non-overlapping spectral requirements for wide color gamut performance.
3Illumination intensity
If two sets of three primary light sources are used for 3D imaging, then three-dimensional image quality is improved, but device complexity and volume increase
Solution Approach 1:
The patent employs a color wheel with six sectors that rotates periodically to sequentially present different primary color combinations. This periodic action allows the system to generate six primary colors and separate left/right eye images through time-multiplexed display, reducing the need for complex simultaneous optical paths while maintaining high 3D image quality.
Solution Approach 2:
The system uses a rotating color wheel to dynamically switch between different color sectors and light paths. This dynamic approach allows a single optical system to serve multiple functions (generating six primaries, separating stereo images) that would otherwise require static, complex multi-path optical arrangements, thereby reducing overall device complexity.
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 reduces the volume of the projector laser light source and simplifies its structure, enabling it to be accommodated in conventional devices while providing images with a wider color gamut and supporting 3D imaging without the need for overlapping spectra.
Implementation Method 1
The yellow phosphor layer is configured to reflect the incident first blue light and convert the first blue into a yellow light
Implementation Method 2
The green phosphor layer is configured to reflect the incident first blue light and convert the first blue light into a green light
Implementation Method 3
The reflector is configured to reflect the first blue light in reverse to the first direction, such that the reflected first blue light is toward the third direction
Implementation Method 4
The yellow reflector is configured to reflect the yellow blue light in reverse to the first direction, such that the reflected yellow light is toward the second direction
Implementation Method 5
The green reflector is configured to reflect the green light in reverse to the third direction, such that the reflected green light is toward the second direction
Implementation Method 6
the first blue light becomes a parallel light directed toward a first direction after the first blue light passes the first lens group
Implementation Method 7
the second blue light, the third blue light, and the red light become parallel light directed toward a second direction after the second blue light, the third blue light, and the red light pass the first lens group. The second lens group has a rear focal plane, in which the second blue light, the third blue light, and the red light passing the first lens group are focused on a third position on the rear focal plane
Data Source
AI summary
A projector laser light source includes two laser point sources, two lens groups, a color wheel, a reflector, a yellow reflector, a green reflector, and an integration rod. The color wheel includes a yellow phosphor layer, a reflective layer, and a green phosphor layer. The integration rod collects light focused on a third position. The positions of yellow phosphor layer and the reflective layer respectively correspond to a fourth position in a first timing and a second timing. Laser emitted by the laser point sources is focused on the third position and the fourth position by two optical Fourier transforms performed by the lens groups, and the laser point sources and the lens groups are combined with the specially designed optical configuration of the green phosphor layer, the reflector, the yellow reflector, and the green reflector. Therefore, two sets of three primary light sources are focused on the third position.