Laser Light Source Layout for High-Brightness Projection
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Solution Overview
Problem
Current laser light sources, particularly those using Multi Chip LD packaging, face challenges in meeting brightness requirements due to the need for multiple lasers to combine light, resulting in increased volume and complexity.
Innovation Solution
A laser light source apparatus is designed with a specific arrangement of lasers, where the first and second lasers emit laser beams of different colors, and a light combining assembly combines these beams along the slow axis, reducing volume and improving homogenization by using polarization and light homogenizing assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple lasers are used to combine light to meet brightness requirements, then brightness is improved, but volume and device complexity increase
Solution Approach 1:
The patent combines multiple laser beams (first and second laser beams of different colors) into a single integrated light output using a light combining assembly. This merging approach achieves the required brightness level while consolidating the optical paths, thereby reducing the overall volume compared to using separate light sources.
Solution Approach 2:
The patent utilizes the slow axis direction for light combination, which is a specific dimensional orientation. By arranging the light combining assembly and laser chips to combine beams along the slow axis rather than conventional axes, the patent optimizes the spatial arrangement to reduce volume while maintaining brightness requirements.
2Illumination intensity
If multiple lasers are used to combine light to meet brightness requirements, then brightness is improved, but device complexity increases
Solution Approach 1:
The patent integrates the light combining function into a unified assembly that handles multiple laser beams simultaneously. By merging the optical paths and using a single light combining assembly for both first and second laser beams, the patent reduces device complexity compared to having separate combination mechanisms for each laser.
Solution Approach 2:
The light combining assembly serves multiple functions: it combines first laser beams, combines second laser beams, and outputs integrated light. This multi-functional design reduces the need for separate components for each laser type, thereby simplifying the overall device structure while achieving required brightness levels.
3Volume of stationary object
If laser beams are combined along the slow axis, then volume is reduced and homogenization is improved, but alignment precision requirements increase
Solution Approach 1:
The patent applies different arrangement strategies to different components: laser chips are arranged in specific patterns (first and second light emitting regions) with particular orientations, while the light combining assembly is positioned to receive beams at specific angles. This localized optimization of component quality and arrangement enables precise alignment along the slow axis, achieving volume reduction while managing alignment precision requirements through careful local 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
This arrangement reduces the combined light path volume and enhances the homogenization of laser beams, improving brightness and color gamut, making it suitable for projection systems.
Implementation Method 1
a light combining assembly, at light emitting sides of the first laser and the second laser, for combing a laser beam emitted from the first light emitting region of the first laser and a laser beam emitted from the second light emitting region of the second laser
Implementation Method 2
emitting a laser beam combined along the first direction, where the first direction is parallel to a direction of a slow axis of the laser beam combined
Implementation Method 3
each of the first laser and the second laser includes a plurality of laser chips for emitting laser beams of three colors
Implementation Method 4
a divergence angle of a laser beam, emitted from the laser chip, along a slow axis of the laser beam emitted from the laser chip is smaller than a divergence angle of the laser beam, emitted from the laser chip, along a fast axis of the laser beam emitted from the laser chip
Implementation Method 5
enhances the homogenization of laser beams, improving brightness and color gamut
Data Source
AI summary
A laser light source apparatus and a projection system are disclosed. The laser light source apparatus includes: a light emitting assembly, including a first laser and a second laser, where each of the first laser and the second laser includes a plurality of laser chips for emitting laser beams of three colors, the first laser and the second laser are arranged along a first direction; the plurality of laser chips in each of the first laser and the second laser are arranged into a first light emitting region and a second light emitting region, and the first light emitting region and the second light emitting region are arranged along a second direction; and a light combining assembly, at light emitting sides of the first laser and the second laser.