Wavelength Conversion Module Stacked Layers for Laser Color Rendering
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Solution Overview
Problem
Laser projection apparatuses suffer from poor color rendering properties due to the limited emission spectra of fluorescent powders, particularly in the red light range, leading to insufficient performance in displaying red colors, which is often addressed by adding additional red LEDs, increasing costs and complexity.
Innovation Solution
A light wavelength conversion module with a stacked-layers design of light wavelength conversion layers, including a substrate, first and second light wavelength conversion layers, and a light transmissive layer, which converts coherent light into different wavelength beams, enhancing the chroma and color reproduction capabilities of the illumination system and projection apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fluorescent powders with emission spectra mainly between 490 nm to 580 nm are used in laser projection apparatuses, then the apparatus can be manufactured with simpler structure and lower cost, but the color rendering property deteriorates due to insufficient red light performance
Solution Approach 1:
The patent divides the wavelength conversion function into multiple fluorescent powder layers, each layer responsible for converting specific wavelength ranges. The first fluorescent powder layer converts blue light to green light, while the second fluorescent powder layer converts blue light to red light, achieving comprehensive spectral coverage through functional segmentation.
Solution Approach 2:
The patent uses composite fluorescent powder materials with different emission characteristics arranged in multiple layers. By combining fluorescent powders with different emission spectra (green-emitting and red-emitting powders) in a layered structure, the system achieves broad spectral coverage and improved color rendering while maintaining manufacturing simplicity.
2Reliability
If additional red light emitting diodes are disposed in laser projection apparatuses to improve color rendering property, then the color rendering performance improves, but the device complexity and cost increase
Solution Approach 1:
The patent merges the wavelength conversion function into the existing blue light optical path by adding fluorescent powder layers to the blue light condensing lens. This integration allows the blue laser light to simultaneously excite multiple fluorescent powder layers, generating green and red light components that combine with the remaining blue light to form white light, thereby improving color rendering without requiring separate LED modules or complex coupling elements.
Solution Approach 2:
The blue light condensing lens is given multiple functions: it focuses blue light onto the display panel and simultaneously serves as an excitation source for the fluorescent powder layers. The fluorescent powder layers perform dual functions of wavelength conversion and color generation, eliminating the need for additional dedicated red light sources and reducing overall system complexity.
3Device complexity
If a single fluorescent powder layer is used for wavelength conversion, then the device structure is simpler, but the chroma and color reproduction capability of the emitted light deteriorates
Solution Approach 1:
The patent transitions from a single-layer structure to a multi-layer structure, adding the dimension of vertical layering. The first fluorescent powder layer is positioned at a first location on the blue light condensing lens, while the second fluorescent powder layer is positioned at a second location, allowing independent optimization of each layer's fluorescent powder composition and thickness to achieve broad spectral coverage with high chroma.
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 effectively enhances the color rendering and reproduction properties of the illumination system, allowing for more vivid image colors by optimizing the red and green light spectra, reducing the need for additional LEDs and lowering costs, while improving heat dissipation and light utilization efficiencies.
Implementation Method 1
The first light wavelength conversion layer is located at the first light wavelength conversion area and is suitable for converting a coherent light beam into a first conversion light beam, wherein wavelengths of the coherent light beam and the first conversion light beam are different from each other
Data Source
AI summary
A light wavelength conversion module including a substrate, a first light wavelength conversion layer, and a first light transmissive layer is provided. The substrate has a light passing-through area and a first light wavelength conversion area. The first light wavelength conversion layer is located at the first light wavelength conversion area and between the first light transmissive layer and the substrate. The first light wavelength conversion layer is suitable for converting a coherent light beam into a first conversion light beam, wherein wavelengths of the coherent light beam and the first conversion light beam are different from each other. An illumination system and a projection apparatus are also provided.