Modular Video Projector Speckle Reduction
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Solution Overview
Problem
Conventional projector systems face challenges in achieving high resolution and reducing speckle artifacts when using coherent light sources, such as lasers, due to the interference patterns they create on display surfaces, which affect image clarity and resolution.
Innovation Solution
The modular video projector system employs a combination of techniques including wavelength diversity, angular diversity, phase angle diversity, and polarization diversity to reduce speckle, achieved through the use of multiple lasers with slightly different wavelengths, RF-modulated signals, fiber optic coupling, and optical components like microlens arrays and spinning refractive elements, along with polarizing and modulating panels to enhance image resolution and clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If coherent light sources like lasers are used to improve brightness and color, then illumination intensity is improved, but speckle artifacts appear that reduce image clarity
Solution Approach 1:
The patent divides the single coherent light source into multiple separate laser sources (red, green, blue lasers) that are spatially separated and independently controlled. This segmentation allows each laser to contribute to the overall illumination while their individual speckle patterns can be managed separately through angular diversity and optical processing.
Solution Approach 2:
The patent introduces angular diversity by using separate optical paths and scanning mechanisms for each color laser. By varying the angle at which light from different lasers reaches the modulating panel, the speckle artifacts are distributed across different spatial locations, effectively reducing their visibility when combined.
2Manufacturing precision
If high resolution is achieved through native resolution of modulating panels, then manufacturing precision is improved, but resolution enhancement is limited by the panel's native capabilities
Solution Approach 1:
The patent employs dynamic scanning mechanisms that move the laser beams across the modulating panel at high speeds. This dynamic approach allows the system to effectively increase the resolution by displaying multiple sub-pixels in different positions within each native pixel area, achieving super-resolution beyond the panel's native capabilities.
Solution Approach 2:
The patent uses periodic scanning patterns where laser beams systematically move across different regions of the modulating panel in a repeating cycle. By controlling the timing and sequence of these periodic scans for different colors and positions, the system reconstructs high-resolution images from the native panel resolution.
3Ease of manufacture
If multiple lasers with different wavelengths are used to improve color quality, then color quality is improved, but speckle reduction becomes more complex
Solution Approach 1:
The patent designs a universal optical engine that handles all three color lasers (red, green, blue) through a single modulating panel and projection lens system. The same optical path and scanning mechanisms are used for all wavelengths, simplifying the overall system architecture while still achieving speckle reduction through the inherent angular diversity provided by the separate laser sources.
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 approach effectively increases the resolution of projected images by up to four times the native resolution of the modulating panels while significantly reducing speckle artifacts, resulting in sharper and more vivid video projections with improved clarity.
Implementation Method 1
The optical engine is configured to receive light from a light engine, receive a video signal from a video processor, modulate the light according to the video signal, and project the modulated light. The system employs wavelength diversity to reduce speckle artifacts.
Implementation Method 2
The system employs phase angle diversity to reduce speckle artifacts achieved through the use of multiple lasers with slightly different wavelengths, RF-modulated signals.
Implementation Method 3
The modular video projector system employs a combination of techniques including wavelength diversity, angular diversity, phase angle diversity, and polarization diversity to reduce speckle, achieved through the use of multiple lasers with slightly different wavelengths, RF-modulated signals, fiber optic coupling.
Implementation Method 4
along with polarizing and modulating panels to enhance image resolution and clarity.
Implementation Method 5
The modular video projector system employs a combination of techniques including wavelength diversity, angular diversity, phase angle diversity, and polarization diversity to reduce speckle.
Implementation Method 6
The modular video projector system employs a combination of techniques including wavelength diversity, angular diversity, phase angle diversity, and polarization diversity to reduce speckle.
Data Source
AI summary
Some embodiments provide for a modular video projector system having a light engine module and an optical engine module. The light engine module can provide narrow-band laser light to the optical engine module which modulates the laser light according to video signals received from a video processing engine. Some embodiments provide for an optical engine module having a sub-pixel generator configured to display video or images at a resolution of at least four times greater than a resolution of modulating elements within the optical engine module. Systems and methods for reducing speckle are presented in conjunction with the modular video projector system.