Holographic Display Segmented Field of View
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Solution Overview
Problem
Current holographic display devices face challenges in generating a large field of view without high computational effort and require a large number of pixels or high frame rates, leading to user discomfort due to the vergence-accommodation conflict in stereoscopic representations.
Innovation Solution
A display device with a segmented field of view, comprising high-resolution and low-resolution holographic segments, where high-resolution segments are focused on the gaze direction and low-resolution segments are used peripherally, reducing the number of pixels and frame rate requirements while minimizing the vergence-accommodation conflict.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a large field of view is generated using a holographic display device, then the viewing angle is improved, but the number of pixels required in the spatial light modulation device increases significantly
Solution Approach 1:
The field of view is divided into multiple segments that are generated at different resolutions. The central region (fovea) is rendered at high resolution while peripheral regions are rendered at lower resolution, allowing a large overall field of view to be achieved without requiring pixels across the entire area at maximum density
Solution Approach 2:
Different regions of the field of view are assigned different quality levels. The central viewing region corresponding to the fovea receives high-resolution rendering, while peripheral regions receive lower-resolution rendering, matching the non-uniform resolution characteristics of human vision
2Area of moving object
If a large field of view is generated by representing different regions in chronological succession, then the viewing angle is improved, but the frame rate requirement increases
Solution Approach 1:
The field of view is segmented into regions that can be rendered simultaneously rather than sequentially. By dividing the scene into zones corresponding to different retinal regions, multiple segments are processed in parallel, reducing the overall frame rate requirement compared to chronological succession of the entire field
3Adaptability or versatility
If stereoscopic representation is used to generate depth perception, then the three-dimensional effect is improved, but user discomfort increases due to vergence-accommodation conflict
Solution Approach 1:
Holographic rendering is applied specifically to the central foveal region where depth perception is most critical, while peripheral regions use lower-resolution stereoscopic or other rendering techniques. This localized application of holography provides realistic depth representation where needed without the computational burden and potential discomfort of full-field holographic rendering
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 allows for a large field of view with reduced computational effort and pixel requirements, enhancing user convenience by minimizing discomfort and maintaining realistic depth representation.
Implementation Method 1
at least one illumination device for emitting coherent light
Implementation Method 2
A holographic display device is based, inter alia, on the effect of diffraction at the apertures of the pixels of the spatial light modulation device
Implementation Method 3
interference of coherent light, which is emitted by a light source
Implementation Method 4
A field lens focuses the light coming from the spatial light modulation device onto the position of a virtual viewing window
Implementation Method 5
at least one spatial light modulation device for modulating incident light
Data Source
AI summary
The invention relates to a display device for representing two-dimensional and/or three-dimensional objects or scenes. The display device comprises at least one illumination device for emitting sufficiently coherent light, at least one spatial light modulation device for modulating incident light, and at least one optical system. The at least one optical system is provided for multiple imaging of the at least one spatial light modulation device and for generating virtual viewing windows in accordance with the number of images of the at least one spatial light modulation device. The individual images of the at least one spatial light modulation device are combined with one another as segments and form a field of view. The field of view comprises at least one high-resolution holographic segment and at least one low-resolution holographic segment.