Laser Illumination Spot Modulation for Wavelength Conversion Efficiency
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Solution Overview
Problem
Projection devices using laser light sources face inefficiencies due to the enlargement of non-conversion regions in wavelength conversion modules, leading to poor light receiving efficiency in homogenization elements, as blue spots without wavelength conversion are also enlarged, affecting overall optical performance.
Innovation Solution
An illumination system with a spot region modulation module that shifts the laser beam's path between the wavelength conversion module and the light source, allowing the wavelength conversion module to rotate and selectively enter either conversion or non-conversion regions, thereby optimizing spot sizes to enhance conversion and light receiving efficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fly eye lens is placed in front of the light source to shape the laser beam spot, then the spot incident on the wavelength conversion region is enlarged to improve conversion efficiency, but the blue spot incident on the non-conversion region is also enlarged, causing poor light receiving efficiency in the homogenization element
Solution Approach 1:
The patent employs a rotating wavelength conversion module that alternates between presenting conversion regions and non-conversion regions to the laser beam. This dynamic switching allows the system to optimize for either conversion efficiency or light receiving efficiency at different times, resolving the contradiction between these two opposing requirements
Solution Approach 2:
The wavelength conversion module is divided into distinct conversion regions and non-conversion regions. By segmenting the module in this way, the system can selectively expose different regions to the laser beam, enabling independent optimization of conversion efficiency and light receiving efficiency through rotational positioning
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 improves conversion efficiency in the wavelength conversion module and light receiving efficiency in the homogenization element, simplifies the optical path structure, and reduces system volume by dynamically adjusting the laser beam's spot size based on the region it interacts with.
Implementation Method 1
The wavelength conversion module has a wavelength conversion region and a non-conversion region, and is configured to rotate on a rotation axis to cause the wavelength conversion region to enter the transmission path of the laser beam
Implementation Method 2
The spot region modulation module is located on the transmission path of the laser beam between the wavelength conversion module and the laser light source. The spot region modulation module is configured to shift the transmission path of the laser beam
Data Source
AI summary
The disclosure provides an illumination system and a projection device applying the illumination system. The illumination system includes a laser light source, a wavelength conversion module, and a spot region modulation module configured to shift a transmission path of a laser beam. When the wavelength conversion module rotates, the spot region modulation module moves, in a first period of time, the laser beam in a wavelength conversion region of the wavelength conversion module along a first shift path, so that the laser beam forms a first spot region in an irradiation region in the wavelength conversion region. The spot region modulation module causes, in a second period of time, the laser beam to form a second spot region in an irradiation region in a non-conversion region of the wavelength conversion module. A size of the first spot region is greater than a size of the second spot region.