Holographic Display Eye-Tracking Light Routing
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Solution Overview
Problem
Current holographic display technologies face limitations in dynamic holographic reproduction due to the need for high-resolution spatial light modulators and complex data processing, and they often waste information outside the viewing area, restricting the development of video holographic reproduction.
Innovation Solution
A display device comprising a light source, spatial light modulator, deflecting member, array of slits, and first lens array, where an eye-tracking device determines the viewer's location to control the deflecting member and first lenses to converge holographic images precisely to the viewer's eye, overcoming limited viewing angles and optimizing light usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional computer-generated hologram display technology is used to form a large wavefront viewing area, then the viewing area is expanded, but the information outside the pupilla windows cannot be viewed and is wasted
Solution Approach 1:
The patent segments the wavefront viewing area into multiple discrete viewing areas, each corresponding to a specific pupilla window. By dividing the large wavefront into smaller manageable segments and assigning each to a specific viewing location, the system ensures that information is properly directed to the correct viewing area, preventing information waste outside the pupilla windows.
Solution Approach 2:
The patent applies local quality by directing different portions of the holographic wavefront to different viewing areas based on the viewer's eye position. Each region of the wavefront is optimized for a specific viewing location, ensuring that information is concentrated where it can be effectively viewed through the pupilla windows rather than being uniformly distributed and wasted.
2Measurement precision
If a spatial light modulator with high resolution is used for holographic display, then image quality is improved, but hardware requirements and system complexity increase
Solution Approach 1:
The patent employs dynamic control of the spatial light modulator based on eye-tracking data. Rather than requiring the SLM to simultaneously maintain high resolution across all viewing areas, the system dynamically adjusts the holographic content displayed on the SLM according to the viewer's eye position, allowing for lower resolution requirements while maintaining perceived image quality.
Solution Approach 2:
The eye-tracking device provides feedback about viewer position, which the system uses to automatically adjust the holographic display configuration. This self-service mechanism allows the system to optimize image quality for the current viewer position without requiring manual intervention or overly complex hardware, as the system adapts itself based on detected eye position.
3Speed
If the data processing system performs a large number of operations quickly for dynamic holographic display, then display speed is improved, but processing complexity and computational load increase
Solution Approach 1:
The patent performs preliminary calculations of the holographic wavefront based on predetermined viewing areas and pupilla window positions. By pre-computing the necessary optical transformations and storing them or preparing them in advance, the system reduces the real-time computational load during actual display operation, maintaining high display speed while reducing processing complexity.
Solution Approach 2:
The patent segments the computational task of holographic rendering into smaller sub-tasks corresponding to different viewing areas and pupilla windows. By dividing the large-scale data processing into manageable segments that can be processed independently and in parallel, the system achieves fast display updates without requiring an overly complex monolithic processing system.
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 solution enables accurate and efficient holographic image convergence to the viewer's eye, enhancing the dynamic holographic display by utilizing eye-tracking and adaptive lens control, allowing for a wider viewing area and improved image quality.
Implementation Method 1
holographic display technology that records and reproduces a real three-dimensional (3D) image of an object by use of interference and diffraction
Implementation Method 2
holographic display technology that records and reproduces a real three-dimensional (3D) image of an object by use of interference and diffraction
Implementation Method 3
control a deflection angle of the first lens such that the light emitted from the first lens is converged to the location of human eye
Implementation Method 4
control the deflecting member to emit light emitted from the spatial light modulator to the slit corresponding to the first lens
Data Source
AI summary
A display device and a method for realizing holographic display by the same are disclosed. The first lens array includes a plurality of first lenses arranged in an array, and the first lenses correspond to a plurality of viewing areas disposed on the light emitting path respectively; the array of slits includes a plurality of slits which are arranged in an array and disposed in one-to-one correspondence with the first lenses; the spatial light modulator loads a holographic image; the eye-tracking device tracks the location of human eye; and after determining a viewing area according to the location of human eye, the controller controls the deflecting member to emit light emitted from the spatial light modulator to the slit corresponding to the first lens which corresponds to the viewing area, and controls a deflection angle of the first lens.