3D Projection Laser Coherence Reduction via Light Modification
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Solution Overview
Problem
Conventional 3D laser projection apparatuses suffer from the generation of diffraction fringes due to the coherent nature of laser light, which affects the viewing experience and increases production and usage costs.
Innovation Solution
The 3D apparatus incorporates a light source device with a laser generation unit, a light modification element, a light guide unit, and a homogenizing unit. The light modification element, such as a scattering sheet or fly-eye lens assembly, reduces the spatial coherence of laser light and ensures a uniform and continuous angular distribution, thereby weakening the diffraction phenomenon at the prism seam of the polarizing and splitting prism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If laser light is used as a light source in 3D projection apparatus, then the brightness and coherence of the light source is improved, but diffraction fringes are generated due to the coherent nature of laser light
Solution Approach 1:
A light modification element is introduced as an intermediary component between the laser light source and the projection optical system. This element modifies the coherent laser light to reduce spatial coherence while maintaining brightness, thereby eliminating diffraction fringes without sacrificing illumination intensity
Solution Approach 2:
The spatial coherence parameter of the laser light is changed by passing it through the light modification element. This transforms the highly coherent laser light into light with reduced spatial coherence, preventing diffraction fringe formation while preserving the high brightness characteristic of laser sources
2Adaptability or versatility
If conventional polarizing and splitting methods are used, then 3D projection function is achieved, but high requirements on production technology are imposed, increasing production and usage costs
Solution Approach 1:
The light modification function is extracted as a separate element that can be independently optimized and manufactured. This allows the polarizing and splitting system to use simpler, more cost-effective components while the light modification element handles the complex coherence management
Solution Approach 2:
The optical system is segmented into distinct functional modules: laser generation, light modification, and polarizing/splitting. This segmentation allows each module to be manufactured and optimized independently, reducing overall production complexity and cost
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 significantly improves the viewing effect by reducing the visibility of diffraction fringes to an unrecognizable level, thereby enhancing user experience while potentially lowering production and usage costs.
Implementation Method 1
The light modification element, such as a scattering sheet or fly-eye lens assembly, reduces the spatial coherence of laser light and ensures a uniform and continuous angular distribution
Implementation Method 2
The polarizing and splitting device includes a prism unit and a lens assembly, and is configured to convert light emitted from the projection apparatus into polarized light through the prism unit and the lens assembly
Implementation Method 3
a laser generation unit configured to output laser light
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A light source device, comprising a laser generation unit (21), a light modification member (22), a light guide unit (23) and a dodging unit (24). The light modification element (22) may enable the laser beam angle to be uniformly distributed. The apparatus comprises a polarized beam splitting device (26), a light engine device (25) and a light source device, such a design may weaken the spatial coherence of the laser so as to make the laser beam angle to be distributed uniformly and continuously, thereby weakening the diffraction phenomena caused by the laser irradiating at a seam of the polarized beam splitting prism in a 3D device and greatly improving the viewing effect.