Holographic Display 2D Encoding Compactness
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Solution Overview
Problem
Existing holographic display devices are bulky and complex, making them unsuitable for portable devices like mobile phones, and they suffer from reduced reconstruction quality due to aberrations at the edges and high costs due to large, heavy lenses.
Innovation Solution
A compact holographic display device is designed using a 2D light source array, a 2D lens array, and a spatial light modulator (SLM) with a beamsplitter that splits light into two bundles for virtual observer windows for each eye, utilizing high-brightness LEDs or OLEDs for coherent light and incorporating optical elements like prismatic arrays and micro-lens arrays for efficient coherence and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large lenses are used in holographic display devices, then reconstruction quality is improved, but device size and weight increase
Solution Approach 1:
The patent divides the single large lens system into multiple smaller lenses arranged in arrays. Each lens in the array processes a portion of the holographic image, allowing the system to achieve the reconstruction quality of a large lens while using smaller, lighter individual lens elements that can be distributed across the display device.
2Manufacturing precision
If large lenses are used in holographic display devices, then reconstruction quality is improved, but device volume increases
Solution Approach 1:
The patent replaces the single large lens with multiple smaller lenses arranged in arrays. This segmentation allows the optical system to be distributed across a larger area while each individual lens is smaller and more compact, reducing the overall device volume compared to a single large lens design.
Solution Approach 2:
The patent transitions from a single-lens three-dimensional optical path to a multi-lens array system that distributes the optical function across multiple dimensions. By arranging lenses in two-dimensional arrays and using multiple light sources, the system achieves the required optical performance without concentrating all optical elements in a single large volume.
3Device complexity
If conventional light sources are used, then device simplicity is maintained, but coherence required for holographic reconstruction is insufficient
Solution Approach 1:
The patent divides the light source into multiple independent point sources arranged in an array. Each point source provides coherent illumination for its corresponding region, and the array as a whole achieves the necessary coherence for holographic reconstruction. This segmentation allows the use of simpler individual light sources while maintaining the coherence required for holography through their coordinated arrangement.
4Volume of moving object
If 2D encoding is used, then device compactness is improved, but aberrations at edges increase
Solution Approach 1:
The patent segments the 2D encoding function across multiple lenses and light sources. Each lens handles a specific region, and by distributing the encoding task across the array rather than concentrating it in a single element, the system reduces aberrations at edges while maintaining the compactness benefits of 2D encoding.
Solution Approach 2:
The patent applies different optical characteristics to different regions of the display. By having multiple lenses and light sources that can be independently controlled, the system can optimize local optical properties to minimize aberrations in specific regions while maintaining overall compactness and holographic reconstruction quality.
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 enables high-quality, compact holographic reconstruction with reduced aberrations and lower costs, allowing for portable and user-friendly three-dimensional image display in devices like mobile phones without compromising image quality.
Implementation Method 1
The cells modulate the amplitude and/or phase of light by encoding hologram values corresponding to a video-hologram
Implementation Method 2
the beamsplitter splits the rays leaving the SLM into two bundles, one of which illuminates virtual observer windows for m left eyes and the other illuminates virtual observer windows for m right eyes
Implementation Method 3
lenses in a 2D lens array
Implementation Method 4
there are m light sources per lens, and the light sources are in m-to-one correspondence with the lenses
Data Source
AI summary
A holographic display including light sources (LS1, LS2, . . . ) in a 2D light source array, lenses (L1, L2, . . . ) in a 2D lens array, a spatial light modulator (SLM) and a beamsplitter, in which there are m light sources per lens, and the light sources are in m-to-one correspondence with the lenses. The beamsplitter splits the rays leaving the SLM into two bundles, one of which illuminates the virtual observer windows for m left eyes and the other illuminates the virtual observer windows for m right eyes. In one example, m=1. An advantage is 2D-encoding with vertical and horizontal focusing and vertical and horizontal motion parallax.