Holographic Display Binocular View Sub-Element Modulation
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Solution Overview
Problem
Current holographic display systems require multiple Spatial Light Modulators (SLMs) or complex mechanical adjustments to achieve binocular stereoscopic views, which is impractical for larger displays and increases the number of required point emitters, making it challenging to create a single display that can provide different images for each eye without increasing the number of sub-elements significantly.
Innovation Solution
A holographic display system using a partially coherent illumination source and a modulation system that combines phase and amplitude modulation of sub-elements to create a sparse image field, allowing a single display to generate binocular images by adjusting the phase and amplitude of sub-elements based on viewer position, reducing the number of required sub-elements and enabling larger field of view without mechanical adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple SLMs or mechanical adjustments are used to achieve binocular stereoscopic views, then the image quality and viewing experience are improved, but the device complexity and number of required sub-elements increase significantly
Solution Approach 1:
The patent combines the functions of multiple SLMs into a single SLM by using a sparse image field where groups of sub-elements work together to create different images for left and right eyes. The modulation system coordinates sub-elements across the entire display area to simultaneously generate stereoscopic images, eliminating the need for separate SLMs for each eye.
Solution Approach 2:
The patent segments the display area into multiple display elements, each comprising groups of sub-elements. These segments are independently controlled to create different optical paths for left and right eyes, enabling binocular viewing from a single SLM through spatial segmentation rather than requiring separate devices.
2Adaptability or versatility
If the number of sub-elements is increased to provide different images for each eye, then the binocular display capability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
Each sub-element in the sparse image field serves multiple functions: it contributes to both the left eye image and the right eye image simultaneously through phase and amplitude modulation. The same physical sub-elements are universally used for both binocular channels, eliminating the need for separate sub-element sets for each eye and simplifying manufacturing.
3Device complexity
If a single holographic display is used instead of binocular displays, then the device simplicity is improved, but the ability to provide different images for each eye deteriorates
Solution Approach 1:
The patent adds the dimension of spatial sparsity by using a sparse image field where sub-elements are strategically positioned and grouped. This dimensional approach allows a single display to encode multiple images (left and right eye views) in the spatial domain through controlled interference patterns, achieving binocular capability without multiple physical displays.
Solution Approach 2:
The modulation system dynamically changes the phase and amplitude parameters of sub-elements based on the desired viewing position and binocular requirements. By adjusting these optical parameters in real-time, the single display adapts to provide different images for each eye, maintaining binocular capability through parameter control rather than structural complexity.
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 allows for a single holographic display to provide binocular views with a significantly reduced number of sub-elements, increasing the field of view and simplifying the construction of binocular headsets, while maintaining image quality and flexibility in viewer positioning.
Implementation Method 1
an illumination source which is at least partially coherent
Implementation Method 2
The modulation system is associated with each display element and configured to modulate at least a phase of each of the plurality of sub-elements
Implementation Method 3
the sub-elements can be combined into an emitter which appears as a point emitter having different amplitude and phase when viewed from different positions
Data Source
AI summary
A holographic display comprises: an illumination source which is at least partially coherent; a plurality of display elements positioned to receive light from the illumination source and spaced apart from each other, each display element comprising a group of at least two sub-elements; and a modulation system associated with each display element and configured to modulate at least a phase of each of the plurality of sub-elements.