Rotary Diffuser Speed Variation for Laser Speckle Reduction
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Solution Overview
Problem
The speckle effect caused by laser light sources in display systems degrades image quality due to interference patterns, which are difficult to eliminate with existing diffusers, leading to visible artifacts on the screen.
Innovation Solution
A rotary diffuser is introduced in the optical path, with its rotational speed continuously varied to move the brightness variations faster than the human eye can perceive, thereby minimizing the visibility of these artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a diffuser is positioned along the optical path to reduce the speckle effect, then the speckle effect is reduced, but an imperfection in the diffuser creates an undesirable light pattern that is visible on the display screen
Solution Approach 1:
The patent applies the dynamics principle by continuously varying the rotational speed of the rotary diffuser. This dynamic adjustment causes the artifact position to change over time, preventing the human eye from perceiving a fixed artifact pattern. The diffuser rotates at speeds that ensure artifact positions do not remain stationary long enough to be visually detected, thus resolving the contradiction between reducing speckle and eliminating artifacts.
Solution Approach 2:
The patent employs parameter changes by modifying the rotational speed parameter of the diffuser. By continuously varying this parameter, the system changes the temporal behavior of artifact positions on the display screen. This parameter variation ensures that artifacts move across different locations rapidly, making them imperceptible to human vision, thereby eliminating the harmful artifact effect while maintaining speckle reduction.
2Object-generated harmful factors
If the rotational speed of the rotary diffuser is increased to move artifacts faster, then artifact visibility is reduced, but the diffuser may not be in the same position long enough to effectively diffuse light
Solution Approach 1:
The patent applies periodic action through the continuous rotation of the diffuser at controlled speeds. The rotational motion creates a periodic movement of artifact positions across the display screen. By optimizing the rotational speed, the system ensures that artifacts move through the visual field in a periodic manner that exceeds human visual perception thresholds, while maintaining sufficient residence time at each position to perform effective light diffusion during each rotation cycle.
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
The continuous variation of the rotary diffuser's rotational speed reduces the visibility of speckle patterns, enhancing image quality by ensuring that the imperfections are not perceived as fixed or slow-moving patterns, thus improving the overall display experience.
Implementation Method 1
one or more diffusers may be positioned along the optical path of the laser
Implementation Method 2
rotary diffuser is introduced in the optical path, with its rotational speed continuously varied to move the brightness variations
Data Source
AI summary
In accordance with the teachings of the present disclosure, a system and method for displaying an image are provided. In one embodiment, the method includes receiving a laser through a rotary diffuser. The rotational speed of the rotary diffuser may be continuously varied to reduce the effect of an image artifact in a light pattern. The image artifact may be caused by an imperfection in the rotary diffuser. The light pattern is projected on a display device.