Acoustooptic Cell Microdisplay Speckle Reduction
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Solution Overview
Problem
Conventional light processing systems face challenges in enhancing pixel resolution and mitigating light speckle, particularly when using coherent light sources like lasers, which result in undesirable visual artifacts such as image speckle.
Innovation Solution
The integration of an acoustooptic cell that diffracts light beams using acoustic waves to produce periodic modulation of the index of refraction, combined with a spatial light modulator and signal processor, enhances pixel resolution and reduces speckle by rapidly shifting images and redirecting coherent light beams at varying angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If coherent light sources like lasers are used in light processing systems, then light efficiency is improved, but image speckle artifacts occur deteriorating visual quality
Solution Approach 1:
The patent applies periodic action by using an acoustooptic cell that periodically modulates the index of refraction through acoustic waves. This periodic modulation diffracts coherent light into multiple directions over time, effectively reducing speckle artifacts while maintaining light efficiency. The periodic nature of the acoustic wave creates a dynamic diffraction pattern that averages out the speckle effect.
2Manufacturing precision
If conventional light processing systems are used, then device complexity is kept simple, but pixel resolution is limited
Solution Approach 1:
The patent introduces an acoustooptic cell as an intermediary component between the light source and the spatial light modulator. This intermediary device uses acoustic waves to diffract light and enhance pixel resolution without requiring complex modifications to the existing spatial light modulator architecture, thus achieving higher resolution with controlled complexity increase.
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 doubles the visual resolution of light processing systems and significantly improves image quality by reducing or eliminating speckle without compromising light efficiency.
Implementation Method 1
When an acoustic wave propagates in a transparent material, it produces a periodic modulation of the index of refraction. This effect provides a moving phase grating that may diffract portions of an incident light beam into one or more directions. This phenomena is known as acoustooptic diffraction.
Data Source
AI summary
A method of processing light includes generating a beam of light and periodically diffracting the beam of light by an acoustooptic cell to produce diffracted light having at least one direction change from the generated light. The method further includes spatially integrating the diffracted light and providing the spatially integrated light to a spatial light modulator.