Projector Scintillation Reduction via Moving Diffusion Member
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Solution Overview
Problem
Conventional image display projectors using laser light sources experience significant scintillation due to screen vibrations, which degrade resolution and cause flicker, as the screen's shift affects the viewing-angle distribution of emitted light, leading to intermittent and strong scintillation phenomena.
Innovation Solution
An image display projector design that includes a Fresnel lens and a diffusion member, where either the Fresnel lens or the diffusion member is moved continuously along a predetermined track in a parallel plane, maintaining a non-zero velocity to reduce scintillation by stabilizing the viewing-angle distribution and minimizing image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the screen is vibrated perpendicularly to the image displaying face, then scintillation is reduced, but resolution is degraded
Solution Approach 1:
The patent changes the vibration direction from the perpendicular dimension (z-axis) to the parallel plane dimension (x-y plane). The diffusion member vibrates horizontally or vertically within the plane parallel to the image displaying face, rather than moving toward or away from the viewer. This dimensional change eliminates resolution degradation while maintaining scintillation reduction benefits.
Solution Approach 2:
The patent applies vibration only to the diffusion member rather than the entire screen assembly including the Fresnel lens. By localizing the vibration to only the light-diffusing component, the system reduces scintillation without causing overall screen shift that would degrade image resolution.
2Object-affected harmful factors
If the screen is vibrated either vertically or laterally with respect to the image displaying face, then scintillation is reduced during motion, but strong scintillation occurs when the screen stops
Solution Approach 1:
The patent ensures continuous vibration of the diffusion member without stopping, even during image display. The vibration motor operates continuously at low amplitude, preventing the screen from returning to a stationary state where strong scintillation would occur. This continuous motion maintains consistent light diffusion and eliminates intermittent scintillation bursts.
3Object-affected harmful factors
If the overall screen shifts, then the Fresnel lens shifts causing viewing-angle distribution to change, but this creates flicker for fixed-direction viewers
Solution Approach 1:
The patent separates the Fresnel lens and diffusion member into independent components. The Fresnel lens remains fixed to maintain stable light collimation and viewing-angle distribution, while only the diffusion member vibrates in the parallel plane to reduce scintillation. This segmentation prevents coupled motion that would cause flicker.
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 solution effectively reduces scintillation, allowing for high-quality image display by maintaining continuous movement and preventing flicker recognition, while also reducing the overall cost and complexity of the projector design.
Implementation Method 1
a Fresnel lens disposed to receive the light emitted from the optical engine, for emitting the incident light as collimated one
Implementation Method 2
a diffusion member, placed in a position frontal to the Fresnel lens in the light-traveling direction, for emitting diffused light, by diffusing the collimated light emitted from the Fresnel lens
Data Source
AI summary
An image display projector is provided so as to reduce scintillation. The image display projector comprises: an optical engine for emitting light according to an inputted imaging signal; a Fresnel lens disposed to receive the light emitted from the optical engine, for emitting the incident light as collimated one; a diffusion member, placed in front of the Fresnel lens in the light-traveling direction, for diffusing the collimated light emitted from the Fresnel lens; and a drive unit for moving either the Fresnel lens or the diffusion member, along a predetermined track (orbit), in a plane parallel to either the plane from which the collimated light or the diffused light is emitted. And then, the moving velocity of either the Fresnel lens or the diffusion member is at any moment larger than zero in any direction within the parallel plane.