Laser Light Source Driving Method Speckle Reduction
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Solution Overview
Problem
Laser projectors using single-color light sources suffer from speckle effects due to longer wavelength interference, significantly degrading imaging quality, particularly with red and green light.
Innovation Solution
A dual-color laser light source system where a first laser assembly continuously outputs a primary color during its designated time interval, and a second laser assembly induces fluorescence in the same color, along with a filter sub-assembly to output mixed fluorescence, reducing coherence and speckle interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-color laser light source is used, then the device complexity is reduced, but speckle effects occur due to longer wavelength interference, degrading imaging quality
Solution Approach 1:
The patent combines multiple light sources (laser light source and fluorescent light source) into a single integrated light source assembly. The laser light source and fluorescent light source are positioned to illuminate the same optical path, merging their functions to produce combined illumination that reduces speckle effects while maintaining system compactness
Solution Approach 2:
The patent uses a composite light source system combining coherent laser light with incoherent fluorescent light. This composite approach mixes different types of light with different coherence properties, where the fluorescent light component suppresses the speckle effects produced by the laser component, achieving improved imaging quality
2Object-affected harmful factors
If a dual-color laser light source system with fluorescent sub-assembly is used, then speckle effects are reduced, but the device complexity increases
Solution Approach 1:
The light source is segmented into distinct functional modules: a laser light source module and a fluorescent light source module. Each module can be independently controlled and optimized, allowing the system to reduce speckle effects through coordinated operation while maintaining manageable complexity through modular design
Solution Approach 2:
The optical path assembly serves multiple functions: it guides laser light, guides fluorescent light, combines the two light types, and directs the combined light to the display device. This multi-functional design reduces the need for separate optical paths for each light source, thereby reducing overall system complexity despite the dual-light-source configuration
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 effectively minimizes speckle effects by ensuring that laser light and fluorescence have different wavelengths, thereby enhancing the imaging quality of the projected images.
Implementation Method 1
exciting a fluorescent sub-assembly with laser light in a second color to induce fluorescence in the first color
Data Source
AI summary
The present application discloses a laser light source driving method, a laser light source and a laser projector, and belongs to the field of laser technology. The driving method includes: continuously outputting, by a first laser assembly, laser light in a first color during an output time interval of a ray in the first color; and during at least part of the output time interval of the ray in the first color, exciting a fluorescent sub-assembly with laser light in a second color to induce fluorescence in the first color, and outputting the fluorescence in the first color, the laser light in the second color being emitted by a second laser assembly.