Laser Light Source Homogenization via Fly-Eye Lens and Segmented Pipe
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Solution Overview
Problem
Conventional laser projection systems face challenges in achieving compact size and efficient light homogenization, leading to larger volumes and poor display brightness due to the need for long light pipes for effective homogenization of laser beams.
Innovation Solution
A light source comprising a first and second laser array, a light combining assembly, and a fly-eye lens, where the laser arrays emit multiple colors of laser light, and the fly-eye lens homogenizes the light, reducing the system's size by eliminating the need for a converging lens group and enhancing light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a long light pipe is used for effective homogenization of laser beams, then light homogenization is improved, but the system size increases
Solution Approach 1:
The light pipe is segmented into multiple sections with different structures. The first light pipe section has a first inner wall surface, and the second light pipe section has a second inner wall surface with different geometric features. This segmentation allows effective homogenization of laser light in a shorter overall length, reducing the system volume while maintaining light homogenization quality.
2Stability of the object's composition
If conventional light homogenization methods are used, then light distribution is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical light homogenization systems with an optimized optical path design featuring specially shaped light pipe inner wall surfaces. The geometric features of the inner walls (such as ridges, grooves, or angled surfaces) provide passive light redistribution without requiring moving parts or complex adjustment mechanisms, thereby reducing device complexity while achieving effective light homogenization.
3Illumination intensity
If multiple laser arrays emitting different colors are combined, then display brightness is improved, but the light combining complexity increases
Solution Approach 1:
The patent merges multiple laser beams of different colors (red, green, blue laser arrays) into a single optical path using the light combining assembly. The optimized light pipe design with its specific inner wall surface geometry facilitates the combination of these different wavelength beams, allowing them to propagate together efficiently toward the projection lens, thereby achieving high display brightness while managing light combining complexity through integrated optical design.
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 enables a compact laser projection apparatus with improved light homogenization, reducing the overall system size and enhancing display brightness by effectively combining and shaping laser beams for uniform color projection.
Implementation Method 1
The fly-eye lens is configured to homogenize the laser light emitted from the at least one laser array
Implementation Method 2
The fly-eye lens includes a substrate, a plurality of first microlenses, and a plurality of second microlenses
Implementation Method 3
the light combining assembly is disposed on a light-output side of the at least one laser array and is configured to guide the laser light emitted from the at least one laser array
Data Source
AI summary
Provided is a light source, comprising at least one laser array, a light combining assembly, and a fly-eye lens; wherein the at least one laser array is configured to emit at least two colors of laser light; the light combining assembly is disposed on a light-output side of the at least one laser array and is configured to guide the laser light emitted from the at least one laser array to the fly-eye lens; the fly-eye lens is disposed on a light-output side of the light combining assembly and is configured to homogenize the laser light emitted from the at least one laser array; wherein the fly-eye lens comprises: a substrate; a plurality of first microlenses disposed on a light-incident surface of the substrate; and a plurality of second microlenses disposed on a light-output surface of the substrate.