3D Display Apparatus Using Stacked Translucent Screens for Depth Perception
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Solution Overview
Problem
Existing technologies face challenges in displaying three-dimensional images without causing a sense of strangeness, particularly when enlarged, due to discrepancies in depth perception from different types of visual information such as parallax, brightness, and motion parallax.
Innovation Solution
The use of multiple screens spaced apart, each diffusing and reflecting part of the incident light while transmitting the remainder, combined with projectors that project three-dimensional images of an object in sectioning positions corresponding to the screens' positions, allowing viewers to combine shapes from multiple screens for a natural three-dimensional perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a three-dimensional image is displayed using parallax between left and right eyes, then a sense of depth is achieved, but a sense of strangeness occurs due to discrepancy with other depth information
Solution Approach 1:
The patent divides the three-dimensional image into multiple cross-sectional views and displays them on separate translucent screens stacked in the depth direction. Each screen shows a different depth layer of the object, allowing the viewer's eyes to naturally focus at different distances for each screen, thereby providing accurate depth information through binocular vision without causing a sense of strangeness.
Solution Approach 2:
The patent transitions from displaying a single two-dimensional image to stacking multiple two-dimensional images in the depth dimension (z-axis). By arranging translucent screens at different positions along the depth direction and displaying cross-sectional images at corresponding depth positions, the system creates a multi-layered three-dimensional display that provides natural depth cues through spatial separation.
2Area of moving object
If an enlarged image is displayed, then the image size increases, but the angle difference between central and peripheral viewing positions causes difficulty in achieving depth sense at the periphery
Solution Approach 1:
The patent applies different depth information to different regions of the display. Each cross-sectional image displayed on a screen corresponds to a specific depth plane of the object, providing locally accurate depth representation. This allows the periphery of enlarged images to maintain proper depth relationships, as each region's depth is determined by its actual position in the cross-sectional view rather than by a uniform parallax applied to the entire image.
3Measurement precision
If multiple types of depth information are combined, then a more accurate sense of depth is achieved, but the complexity of the display system increases
Solution Approach 1:
The patent combines multiple depth cues (binocular parallax, accommodation, and motion parallax) into a unified display system using stacked translucent screens. By projecting cross-sectional images onto multiple screens at different depths, the system naturally provides binocular disparity information while also enabling accommodation-convergence matching, thereby integrating multiple types of depth information without requiring separate systems for each cue.
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 approach eliminates discrepancies in depth perception, enabling a natural and easy-to-understand three-dimensional image display without strangeness, even when enlarged, by projecting images on screens positioned in the depth direction, enhancing the sense of distance and clarity.
Implementation Method 1
each of the screens diffusing and reflecting part of the light incident thereon
Implementation Method 2
each of the screens diffusing and reflecting part of the light incident thereon
Data Source
AI summary
An image display apparatus for displaying an image of an object on a screen by using a projector includes a three-dimensional image display unit having a plurality of screens overlaid but spaced apart from one another, each of the screens diffusing and reflecting part of the light incident thereon and transmitting the remainder of the light, and an image projection unit having a plurality of projectors, each of the projectors is assigned to the corresponding one of the screens and projects an image of the object on the screen. The image projection unit displays a three-dimensional image of the object in the three-dimensional image display unit by projecting on the screens the shapes of the object in sectioning positions corresponding to the positions of the screens.