Laser Projection Layout With Planar Light Circuit Alignment
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Solution Overview
Problem
Current laser projection systems require multiple expensive and time-consuming to manufacture and calibrate components for combining red, green, and blue laser beams, leading to high overall costs.
Innovation Solution
A compact and cost-reduced laser projection arrangement is proposed, featuring a sub-mount carrier with edge-emitting lasers and a planar light circuit with light guides, where the lasers and light guides are aligned at a predefined distance to simplify adjustment and reduce complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light sources and beam combining components are used, then the projection system can achieve the required light output, but the overall cost increases due to expensive components and time-consuming calibration
Solution Approach 1:
The patent combines multiple laser sources (red, green, blue) and their beam combining optics into a single integrated laser bar component. This merging eliminates the need for separate beam combining components and reduces the overall number of parts in the projection system while maintaining the required light output for color projection.
Solution Approach 2:
The laser bar serves multiple functions simultaneously: it generates multiple laser wavelengths (red, green, blue), provides beam combining through integrated optics, and outputs collimated beams ready for projection. This multi-functionality replaces what would traditionally require separate components for each function.
2Reliability
If multiple individual components are used for beam combining and collimation, then the optical function is achieved, but the manufacturing and calibration time increases
Solution Approach 1:
By integrating beam combining and collimation functions into the laser bar structure, the patent eliminates multiple separate optical components that would require individual alignment and calibration. The integrated design ensures proper optical function while dramatically reducing calibration time.
3Illumination intensity
If traditional beam combining methods are used, then the required light superposition is achieved, but the overall system cost increases
Solution Approach 1:
The patent merges beam combining and collimation into a single integrated laser bar component, reducing the total number of parts that need to be manufactured, assembled, and maintained. This integration lowers overall system cost while achieving the required light superposition for color projection.
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 effectively reduces overall costs by simplifying the adjustment process and reducing the number of components required, while maintaining the quality of the projected image by minimizing optical artefacts.
Implementation Method 1
The PLC elements are preferably configured so that they move the wavefronts of a light signal caused by the length and curvature relative to each other. This contributes to suppressing interference effects
Implementation Method 2
A typical application for AR/VR glasses concepts use diffractive light guide in the lenses of the glasses. Diffractive light guides (light distribution via diffraction effects) in connection with coherent light sources
Data Source
AI summary
The invention relates to a laser projection arrangement. The arrangement includes a sub-mount carrier with a main surface and at least one edge-emitting laser arranged on the sub-mount. The at least one edge-emitting laser is facing the sub-mount and includes at least one laser facet that is located at a predefined distance from the main surface of the sub-mount. A planar light circuit with at least one light guide has an inlet and is arranged on the sub-mount such that the at least one light guide and the inlet is located at the predefined distance from the main surface of the sub-mount facing the at least one laser facet.