Laser Device Diffuser Plate Speckle Noise Reduction
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Solution Overview
Problem
Speckle noise significantly degrades image quality in laser-based image display and sensing devices, and existing methods to reduce it, such as using multiple wavelengths or polarized light, are insufficient and often result in larger device sizes due to complex optical systems.
Innovation Solution
A laser device incorporating a diffuser plate that diffuses light before collimation, with specific spread angle and diffusion angle ratios, to reduce speckle noise while maintaining light directivity, comprising a laser light source, a collimating lens, and a diffuser plate that covers the output surface of the laser light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light is processed by optical systems (multiple wavelengths, polarization mixing, diffusion) to reduce speckle noise, then speckle noise is reduced, but the device size increases and complexity increases
Solution Approach 1:
The patent extracts the speckle noise reduction function from complex optical systems and implements it through a simple diffuser plate with specific geometric parameters. The diffuser plate is a single-component solution that performs the noise reduction function without requiring multiple optical elements, wavelengths, or polarization components.
Solution Approach 2:
The patent changes the geometric parameters of the diffuser plate (protrusion height h, protrusion width w, pitch p, and refractive index n) to achieve optimal speckle noise reduction. By carefully controlling these parameters to satisfy specific inequality relationships, the diffuser plate effectively reduces speckle noise while maintaining a simple structure.
2Object-affected harmful factors
If light is processed by optical systems to reduce speckle noise, then speckle noise is reduced, but the device size becomes large
Solution Approach 1:
The patent extracts the speckle noise reduction function from bulky optical systems and implements it through a compact diffuser plate. This single-component approach eliminates the need for multiple optical elements, wavelength division components, or polarization mixing devices, thereby significantly reducing the overall device size.
Solution Approach 2:
The patent uses a diffuser plate with micro-protrusions that creates multiple scattered light paths, effectively copying the light in different directions. This copying approach achieves speckle noise reduction similar to complex optical systems but with a much simpler and more compact structure.
3Object-affected harmful factors
If a diffuser plate is added to the laser device, then speckle noise is reduced, but the device complexity increases
Solution Approach 1:
The patent extracts the speckle noise reduction function from complex optical systems and implements it through a single diffuser plate component. This approach adds only one element to the laser device while achieving effective noise reduction, minimizing the increase in device complexity.
Solution Approach 2:
The patent controls the geometric parameters of the diffuser plate (protrusion height h, protrusion width w, pitch p, and refractive index n) to satisfy specific inequality relationships. By optimizing these parameters, the diffuser plate achieves effective speckle noise reduction with a simple structure that does not significantly increase device complexity.
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
Effectively reduces speckle noise by lowering the coherence of the laser light, improving image quality without increasing the device size, and can be applied to projection type image display and sensing devices.
Implementation Method 1
a diffuser plate that diffuses the light from the laser light source before collimating the light
Implementation Method 2
Speckle noise is noise in which a random fine interference pattern is generated by the diffusion action of an object to be irradiated (for example, a screen) and the interference with coherent laser light
Implementation Method 3
a collimating lens that collimates the light output from the laser light source
Data Source
AI summary
Provided is a laser device, comprising a laser light source, a collimating lens that collimates the light output from the laser light source, and a diffuser plate that diffuses the light from the laser light source before collimating the light.