Holographic Display Segmentation for Ghost Image Elimination
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Solution Overview
Problem
The existing technologies face challenges in increasing the field of view for holographic projections, particularly when the display device is small and the projection distance is large, leading to limited angular range of light rays that can propagate through the eye's pupil, resulting in a small field of view and sensitivity to eye position, and the presence of ghost images that reduce image quality.
Innovation Solution
A light engine is used to determine the contributory and non-contributory areas of the display device based on the eye's entrance pupil, allowing only the primary contributory areas to contribute to the main image and omitting or modifying secondary areas to eliminate ghost images, and a waveguide is employed to expand the field of view and pupil, enabling movement of the eye while maintaining image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display device is made small and projection distance is increased, then the device compactness and projection capability are improved, but the field of view becomes limited and sensitivity to eye position increases
Solution Approach 1:
The patent segments the display device into contributory and non-contributory areas based on eye position. Only the contributory areas that can actually project light through the pupil are used for hologram calculation, effectively dividing the display surface into functional zones that adapt to the viewer's position.
Solution Approach 2:
The system dynamically adjusts the hologram calculation based on real-time eye position data. The contributory area identification changes as the eye moves, making the system adaptive to different viewing positions and expanding the effective field of view beyond what a static small display could provide.
2Area of stationary object
If all areas of the display device are used for hologram projection, then the image coverage is maximized, but ghost images are generated that reduce image quality
Solution Approach 1:
The patent extracts and removes the non-contributory areas from the hologram calculation process. By identifying which display areas cannot contribute to the image through the pupil and excluding them, the system eliminates the source of ghost images while maintaining full utilization of the contributory areas.
Solution Approach 2:
Different areas of the display device are assigned different functions based on their contribution to the final image. The contributory areas are optimized for image formation with appropriate hologram encoding, while non-contributory areas are either left unused or assigned different optical functions, creating local quality variations that prevent ghosting.
3Adaptability or versatility
If the field of view is expanded using traditional methods, then the viewing angle increases, but ghost images and image blurring are introduced
Solution Approach 1:
The system uses eye tracking feedback to continuously monitor pupil position and adjust the hologram calculation accordingly. This feedback loop ensures that only the areas that can actually contribute to the image at any given moment are used, maintaining image clarity while adapting to different viewing positions and effectively expanding the field of view.
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 enhances the field of view, reduces ghost images, and provides sharp, accurate holographic images by optimizing the hologram calculation and display on the spatial light modulator, ensuring that only necessary areas of the display device contribute to the image, thereby improving image quality and reducing blurring.
Implementation Method 1
The pixels of the display device diffract light. In accordance with well-understood optics, the magnitude of the maximum diffraction angle is determined by the size of the pixels
Implementation Method 2
a waveguide is employed to expand the field of view and pupil, enabling movement of the eye while maintaining image clarity
Data Source
AI summary
Display system and methods including a display device arranged to display a hologram and spatially modulate light and a hologram engine arranged to receive contribution information identifying contributory and non-contributory areas of the display device based on the location of an entrance pupil. The contributory areas of the display device propagate light passing through the entrance pupil at the determined location. The non-contributory areas of the display device propagate light stopped by the entrance pupil at the determined location. The contribution information identifies (i) at least one primary contributory area of the display device that contributes to a primary image and (ii) at least one secondary contributory area of the display device that contributes to a secondary image. The hologram engine is arranged to determine a hologram based on the at least one primary contributory area of the display device identified by the processing engine.