Laser Projection Device with Built-in Micro Laser Diodes
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Solution Overview
Problem
Prior laser projection technologies are not compact due to the need for external light sources, suffer from dynamic deformation of MEMS scanning mirrors during high-frequency scanning, and require complex mechanical structures or control algorithms for raster scanning, limiting image quality and device miniaturization.
Innovation Solution
A laser projection device with built-in micro laser diodes that use a light source scanner for fast-axis scanning and a MEMS scanning mirror for slow-axis scanning, eliminating the need for external light sources and simplifying the structure, while reducing dynamic deformation and complexity through synchronous control and single-axis driving structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If external light sources are used in prior laser scanning systems, then the laser projection devices can function, but the devices are not compact enough and miniaturization is affected
Solution Approach 1:
The patent integrates the laser light source directly into the scanning system, merging the light source function with the scanning mechanism. This eliminates the need for separate external light sources and reduces the overall device volume, enabling compact laser projection devices while maintaining full functionality.
2Device complexity
If dual-axis scanning is used to complete raster scanning patterns, then the scanning function is achieved, but the mechanical structure becomes complicated and control algorithms become complex
Solution Approach 1:
The patent segments the scanning function into two independent single-axis scanners: a light source scanner for fast-axis scanning and a MEMS scanning mirror for slow-axis scanning. This segmentation simplifies the mechanical structure by replacing complex dual-axis scanning with two simpler single-axis components while maintaining raster scanning capability through coordinated operation.
3Speed
If high-frequency scanning is performed on MEMS scanning mirrors, then the scanning speed increases, but dynamic deformation occurs and image quality decreases
Solution Approach 1:
The patent divides the scanning tasks between two components with different functional roles: the light source scanner performs high-frequency fast-axis scanning, while the MEMS scanning mirror performs low-frequency slow-axis scanning. This segmentation allows each component to operate at its optimal frequency range, preventing dynamic deformation in the MEMS mirror while maintaining high overall scanning speed.
Solution Approach 2:
The patent introduces a light source scanner as an intermediary component that handles the high-frequency scanning function. This intermediary absorbs the high-frequency scanning demands, protecting the MEMS scanning mirror from high-frequency operations that would cause dynamic deformation, thereby maintaining image quality while achieving high scanning speed.
4Adaptability or versatility
If optical fiber scanners are used for raster scanning, then the scanning function is achieved, but the scanning angle of the slow axis is limited and mechanical performances are affected by structural symmetry
Solution Approach 1:
The patent segments the scanning function between a light source scanner and a MEMS scanning mirror, where the MEMS mirror is specifically designed for slow-axis scanning with larger angular ranges. This segmentation allows the MEMS mirror to operate independently at its optimal scanning angle without being constrained by optical fiber structural symmetries, improving both scanning angle range and mechanical performance reliability.
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, high-resolution projection system with improved image quality and extended service life of the MEMS scanning mirror, allowing for miniaturization and reduced fabrication/control complexity, without the need for external light sources.
Implementation Method 1
the cantilevered free ends of the optical fibers are disposed in a piezoelectric tube, and can be excited by the piezoelectric tube to resonate on an orthogonal axis
Implementation Method 2
a raster scan pattern is formed through dual-axis vibration of the MEMS scanning mirror, and the MEMS works on the dual axes respectively in a slow scan manner and a fast scan manner
Implementation Method 3
The laser projection device comprises a light source scanner and a MEMS scanning mirror, the light source scanner comprising micro laser diodes; and the micro laser diodes are used to provide laser beams needed by projection
Data Source
AI summary
The present disclosure provides a laser projection device and a laser projection system. The laser projection device includes a light source scanner and a MEMS scanning mirror, the light source scanner including micro laser diodes; and the micro laser diodes are used to provide laser beams needed for image projection, and the laser beams are projected to the MEMS scanning mirror, and then reflected by the MEMS scanning mirror to a predetermined area to form a projection image. By providing the micro laser diodes in the laser projection device and initiatively emitting laser by exciting the micro laser diodes, the present disclosure does not need an external laser source and facilitates the reduction of the size of the laser projection device, as compared with the prior art.