Elastically Supported Vibrating Diffuser for Laser Speckle Reduction
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Solution Overview
Problem
Projection video display devices using coherent light sources, such as lasers, suffer from speckle noise, which degrades image quality, and existing solutions like rotating or vibrating diffusers are complex or inefficient.
Innovation Solution
An optical device with a diffuser that diffuses coherent light and is vibrated by a driver, supported elastically at one point, is integrated into the light path to reduce speckle noise, employing a simple configuration that minimizes power consumption and prevents damage from excessive vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a rotating or vibrating diffuser is used to reduce speckle noise, then speckle noise is reduced, but device complexity increases
Solution Approach 1:
The patent applies mechanical vibration by causing the diffuser to vibrate in the optical path of coherent light. The diffuser is made to oscillate mechanically, which modulates the light diffusion pattern over time, thereby reducing speckle noise in the projected image while maintaining a relatively simple device structure without complex rotating mechanisms
Solution Approach 2:
The patent implements dynamics by transitioning from a static diffuser to a dynamically vibrating one. The diffuser's position is changed continuously through vibration, creating time-varying light diffusion patterns that reduce speckle noise. This dynamic approach achieves speckle reduction without requiring complex mechanical structures like rotating assemblies
2Object-affected harmful factors
If a vibrating diffuser is used to reduce speckle noise, then image quality is improved, but power consumption increases
Solution Approach 1:
The patent uses mechanical vibration of the diffuser to reduce speckle noise, which requires minimal power compared to rotating mechanisms. The vibration amplitude and frequency are kept small and optimized to achieve speckle reduction while minimizing energy consumption, making the solution suitable for portable projection devices
Solution Approach 2:
The patent optimizes vibration parameters (amplitude, frequency, waveform) to achieve the minimum necessary vibration for speckle noise reduction. By carefully selecting and adjusting these parameters, the system achieves effective speckle suppression while keeping power consumption at acceptable levels for portable applications
3Object-affected harmful factors
If a vibrating diffuser is used to reduce speckle noise, then speckle noise is reduced, but reliability decreases due to potential damage from excessive vibration
Solution Approach 1:
The patent incorporates cushioning elements and damping structures to protect the diffuser from excessive vibration during transportation and handling. These protective measures are built into the device structure beforehand, allowing the diffuser to vibrate during operation for speckle reduction while preventing damage during non-operational phases when vibration control is not active
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 in projection video display devices with a simple configuration, enhancing image quality while minimizing power usage and preventing damage from excessive vibration during transportation.
Implementation Method 1
a diffuser (44) which diffuses light
Implementation Method 2
a supporter (94) whose one end elastically supports the holder (91, 111) at one point
Data Source
AI summary
The optical device includes a diffuser which diffuses light, a holder which holds the diffuser, a driver which vibrates the holder, and a supporter whose one end elastically supports the holder at one point and whose other end is fixed to an installation plane.