Holographic Projection Device Scanning 1D Modulator Arrays
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Solution Overview
Problem
Conventional holographic display devices are limited by the size of the field lens, offer restricted observer movement, and suffer from periodic diffraction orders in the Fourier plane, resulting in small reconstruction volumes and limited observer freedom.
Innovation Solution
A holographic projection device is divided into a scanning system and a projection system, where the scanning system sequentially scans one-dimensional arrangements of a two-dimensional light modulator with coherent light, allowing for faster reconstruction of two- and three-dimensional scenes over a larger volume, and includes a position detection system to track observer eye positions for a virtual observer window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a field lens is used to reconstruct the hologram, then the holographic display can be implemented, but the size of the reconstructed scene is limited by the field lens size
Solution Approach 1:
The patent divides the holographic display into two independent systems: a scanning system that sequentially scans one-dimensional arrangements of the light modulator, and a projection system that projects the scanned wavefronts. This segmentation eliminates the need for a large field lens while enabling large reconstruction volume through the scanning mechanism.
Solution Approach 2:
The patent transitions from two-dimensional hologram recording to sequential one-dimensional scanning of the light modulator. By scanning one-dimensional arrangements line by line, the system achieves three-dimensional reconstruction without being constrained by the field lens size, effectively adding a temporal dimension to the scanning process.
2Adaptability or versatility
If conventional holographic display devices are used, then holographic reconstruction is achieved, but observer movement is restricted
Solution Approach 1:
The patent implements a dynamic scanning system that can adaptively adjust the scanning pattern and projection parameters based on observer position. The scanning system sequentially scans different one-dimensional arrangements, creating a dynamic wavefront that can be optimized for different viewing angles and observer locations, thereby enhancing observer freedom.
3Loss of time
If two-dimensional light modulator is scanned sequentially, then computation time is reduced, but scanning speed requirements increase
Solution Approach 1:
The patent segments the two-dimensional light modulator into multiple one-dimensional arrangements that are scanned sequentially. This segmentation reduces the computational complexity from two-dimensional to one-dimensional transformations, significantly reducing computation time while the scanning mechanism maintains acceptable speed requirements through optimized scanning patterns.
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 enables faster computation and larger observer ranges with improved image quality by avoiding complex two-dimensional transformations and eliminating periodic diffraction order visibility, enhancing the reconstruction volume and observer freedom.
Implementation Method 1
at least one light source (2) which emits sufficiently coherent light which is used to generate a wave front
Implementation Method 2
the scanning element scans with coherent light one after another one-dimensional arrangements of modulation elements (4)
Implementation Method 3
at least one two-dimensional light modulator device (3) which comprises modulation elements (4)... which modulate the phase and amplitude of incident light
Implementation Method 4
the reconstruction is typically repeated showing irregularities in adjacent periodicity intervals... due to the discrete recording and because of the effects of diffraction
Data Source
AI summary
A holographic projection device comprises for the reconstruction of scenes at least one light source which emits sufficiently coherent light for the generation of a wave front. Further, the projection device comprises at least one light modulator device containing modulation element, said projection device being of a two-dimensional design. The light modulator device and a scanning element are combined such that the light emitted by the scanning element only scans one one-dimensional arrangement of modulation elements of the two-dimensional light modulator device at a time.