Holographic Array Encoding for Large Viewing Zone
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Solution Overview
Problem
Conventional holographic displays face challenges in providing a large enough viewing zone for both eyes to view a three-dimensional scene without causing eye fatigue, due to the mismatch between parallax information and eye accommodation, and require high-resolution, costly hardware and significant computing power.
Innovation Solution
A method using a line light source with coherent light in the vertical direction and incoherent in the horizontal direction, where the holographic array encodes two separate perspective views for each eye, allowing simultaneous reconstruction of one-dimensional video holograms in separate viewing windows, reducing the need for high-resolution displays and computing power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional high-resolution holographic displays are used to provide a large viewing zone for both eyes, then the viewing zone is sufficient, but the hardware cost and computing power requirements increase significantly
Solution Approach 1:
The patent divides the holographic display into multiple independent low-resolution displays arranged in a matrix pattern. Each display segment generates a portion of the overall holographic image, and together they form a complete viewing zone that is large enough for both eyes. This segmentation allows the system to achieve a large effective viewing area without requiring each individual display to be high-resolution, thus reducing hardware complexity and cost.
2Area of stationary object
If multiple high-resolution displays are combined to enlarge the viewing zone, then the viewing zone increases, but the device volume and depth increase
Solution Approach 1:
The patent merges multiple low-resolution displays into a unified holographic system where each display contributes to the same virtual image space. By combining these displays in a matrix arrangement and using coherent light sources, the system creates a single large viewing zone without requiring large physical spacing between components. The optical paths are integrated to produce a compact device volume while maintaining an enlarged effective viewing area.
3Device complexity
If conventional optics are used for 3D display, then the implementation is simple, but there is a mismatch between parallax information and eye accommodation causing eye fatigue
Solution Approach 1:
The patent replaces conventional optical systems with a holographic display system that uses coherent light and spatial light modulation. Instead of relying on traditional lenses and mirrors that create fixed-focus images on a display surface, the system uses the interference and diffraction properties of coherent light to reconstruct three-dimensional wavefronts. This substitution enables the eyes to naturally accommodate to different depths in the virtual scene while maintaining correct parallax information, thereby eliminating eye fatigue without significantly increasing optical system 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
Enables real-time reconstruction of video holograms with minimal flickering and cross-talk over a large viewing area, using commercially available hardware, ensuring comfortable viewing with reduced eye fatigue and lower hardware demands.
Implementation Method 1
coherent light supplied by a line light source which is coherent in the vertical direction and incoherent in the horizontal direction
Implementation Method 2
The SLM diffracts the light waves and reconstructs the scene
Implementation Method 3
A holographic display reconstructs objects by coherent superposition of light waves
Implementation Method 4
coherent light supplied by a line light source and imaged by optical focusing means
Data Source
AI summary
A method and a device for encoding and reconstructing computer-generated video holograms using a conventional LC display: it provides holographic reconstruction of three-dimensional scenes using electronically controllable pixel in a holographic array (3) with a conventional resolution, and is reasonably free from flickering and cross-talk. Reconstruction is in real time, and for both eyes at the same time, over a large viewing zone. The method takes advantage of an optical focusing means (2) in order to image vertically coherent light emitted by a line light source (1) into viewing windows (8R, 8L) after modulation by the pixel array (3). The holographic reconstruction (11) of the scene is rendered visible from viewing windows (8R, 8L) for both eyes of an observer by way of diffraction at the pixels. According to the invention, the controllable pixels are disposed in vertical pixel columns (15, 16), which encode separate holograms of the same scene for each of the viewer's eyes (R, L), where said holograms are one-dimensional in the vertical direction and horizontally interleaved. An image separation means (7) with separating elements arranged parallel to the pixel columns reveals the respective pixel columns (15, 15′ or 16, 16′) for one eye and covers them for the other eye.