Dynamic Diffusion Control for 3D Display Ghosting
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Solution Overview
Problem
Existing methods for displaying 3D video images with motion parallax using multiple projectors suffer from image quality degradation due to ghosting, particularly when the diffusion angle of the screen is too wide relative to the projector spacing, causing video images from adjacent projectors to be perceived at viewpoints other than the intended intermediate position.
Innovation Solution
A display apparatus and method that includes a viewpoint position detection unit to determine the viewer's position and a diffusion property control unit to adjust the screen's diffusion property accordingly, ensuring a constant combined luminance by controlling the diffusion angle in relation to the projector spacing, thereby preventing ghosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wide diffusion angle of the screen is used, then the viewing range and luminance distribution are improved, but video images from adjacent projectors are perceived at incorrect viewpoints causing ghosting
Solution Approach 1:
The patent applies the dynamics principle by making the diffusion property of the screen adjustable rather than fixed. The diffusion property control unit dynamically changes the diffusion angle of the screen based on the detected viewpoint position, allowing the system to adapt to different viewing conditions and eliminate ghosting while maintaining good luminance distribution.
Solution Approach 2:
The patent applies parameter changes by modifying the diffusion angle parameter of the screen according to the viewpoint position. When the viewpoint position changes, the system adjusts the diffusion angle to an appropriate value, ensuring that the screen's light scattering properties match the required geometric relationship between projectors and viewer position.
2Ease of operation
If the diffusion angle is not appropriately controlled relative to projector spacing, then the system is simpler to operate, but image quality degrades due to ghosting
Solution Approach 1:
The patent applies feedback by using the viewpoint position detection unit to continuously monitor the viewer's position and feeding this information back to the diffusion property control unit. This closed-loop control ensures that the diffusion angle is automatically adjusted to maintain optimal image quality without requiring manual intervention or complex user configuration.
Solution Approach 2:
The system applies self-service by automatically detecting the viewpoint position and adjusting the screen's diffusion property without user intervention. The diffusion property control unit self-regulates the screen parameters based on real-time viewpoint detection, making the system both easy to operate and reliable in maintaining image quality.
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 solution effectively prevents image quality degradation from ghosting by dynamically adjusting the screen's diffusion property based on the viewer's position, ensuring a smooth luminance variance and maintaining image quality across different viewpoints.
Implementation Method 1
controlling a diffusion property and a focusing property of a screen
Data Source
AI summary
Provided is a display method that prevents degradation of image quality due to ghosting. The display method performed with a display apparatus includes a viewpoint position detection step (S1) for detecting a viewpoint position d that is an interval between a reflection screen and a viewer α, a diffusion property control step (S2) for controlling a diffusion property of the reflection screen 40 in accordance with the viewpoint position d, and a projection step for projecting multiple viewpoint video images having disparity from multiple projectors to the reflection screen. The diffusion property control step (S2) includes controlling the diffusion property of the reflection screen 40 by varying a voltage or a duty cycle of an ac signal that is applied to a diffuser layer included in the reflection screen.