Display Screen Speckle Reduction via Wave Actuation
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Solution Overview
Problem
Speckle, caused by light interference, is a high-frequency intensity variation issue in display applications using coherent or partially coherent sources, which existing technologies have not adequately addressed, particularly in large cinematic screens.
Innovation Solution
The use of screen vibration techniques, achieved through actuating elements generating acoustic or electromagnetic waves to impart vibration to the screen, with frequencies and velocities optimized to reduce speckle, such as using audio speakers or electromagnetic generators to create waves that exceed half the optical wavelength divided by the viewer's integration time, and resonate with the screen's frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If coherent or partially coherent light sources are used for display, then brightness and color gamut are improved, but speckle interference patterns are generated causing intensity variations
Solution Approach 1:
The patent applies mechanical vibration to the display screen through acoustic or electromagnetic actuation. The screen is vibrated at frequencies and amplitudes that cause the speckle pattern to fluctuate rapidly, allowing the human eye to temporally average the intensity variations and perceive a uniform image without speckle artifacts.
Solution Approach 2:
The patent employs periodic vibration of the screen at specific frequencies (e.g., resonance frequencies) to continuously modulate the speckle pattern. This periodic action ensures that the interference patterns cycle through various states faster than the observer can detect individual variations, effectively eliminating the perception of speckle while maintaining the benefits of coherent light sources.
2Object-affected harmful factors
If mechanical transducers are used to vibrate the screen, then speckle reduction is achieved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical transducer systems with acoustic or electromagnetic wave generation methods. Instead of directly mechanically coupling transducers to the screen, the invention uses sound waves or electromagnetic fields to induce vibration in the screen, thereby achieving the same speckle reduction effect with simpler, less intrusive equipment.
Solution Approach 2:
The patent introduces acoustic waves or electromagnetic waves as intermediary carriers to transfer energy to the screen. These wave-based intermediaries couple the actuating elements to the screen without requiring direct mechanical contact or complex mechanical interfaces, simplifying the overall system architecture while maintaining effective vibration for speckle reduction.
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 method effectively reduces speckle by averaging out intensity variations, providing a uniform vibration without the need for expensive mechanical transducers or attachments, and can be used in conjunction with other speckle reduction methods for cinematic screens of all sizes.
Implementation Method 1
The at least one actuating element may include at least one audio speaker and the waves generated may be sound waves
Implementation Method 2
The at least one actuating element may include at least one electromagnetic wave generator, and the waves generated may be electromagnetic waves
Implementation Method 3
The waves may impact the screen at a frequency substantially equal to a resonance frequency of the screen
Implementation Method 4
Speckle is due to interference of the light on the screen or target that causes variations in intensity
Data Source
AI summary
Disclosed herein are systems and related methods for reducing speckle on display screen. More specifically, screen vibration is used to reduce speckle, and in accordance with the disclosed principles, the vibration may be achieved by using wave-based actuation (e.g., acoustic or electromagnetic waves) to vibrate the screen. In an exemplary embodiment, a speckle reducing system may comprise at least one actuating element located proximate to, but not in physical contact with, a display screen. In addition, the at least one actuating element may be configured to generate waves directed towards the display screen. When the waves impact the display screen, the waves impart vibration to the display screen.