Dynamic Tiling for Holographic Spatial Light Modulators
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Solution Overview
Problem
Current holographic projection technologies face challenges in achieving high-quality image reconstruction due to optical noise and artefacts, particularly when dealing with spatial light modulators that have fewer pixels than the display device, leading to suboptimal use of display resources and reduced image resolution.
Innovation Solution
A driver for spatial light modulators implements a dynamic tiling scheme that maps input holograms onto the display device's pixels, utilizing a combination of full-tiles and part-tiles to maximize pixel usage, thereby improving image quality by smoothing optical effects and reducing artefacts, and allowing for higher resolution without increasing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a static tiling scheme is used to map input holograms onto the display device, then the mapping process is simple, but optical noise and artefacts increase, reducing image quality
Solution Approach 1:
The patent applies dynamic tiling schemes where the tiling configuration changes over time between different input holograms. The tiling engine dynamically adjusts the mapping of input hologram pixels to display device pixels, alternating between multiple tiling schemes (e.g., first tiling scheme for one input hologram, second tiling scheme for the next). This dynamic approach smooths optical effects and reduces artefacts while maintaining manageable system complexity.
2Quantity of substance
If the display device has more pixels than the input hologram, then more display resources are available, but the extra pixels are not fully utilized, reducing resolution efficiency
Solution Approach 1:
The patent segments the display device pixels into multiple tiles, where each tile maps to a portion of the input hologram. The tiling engine divides the display device pixel array into a first tile and a second tile (and potentially more tiles), allowing systematic utilization of all display pixels. This segmentation enables full utilization of display resources while maintaining the ability to process input holograms of various sizes.
Solution Approach 2:
The patent introduces a temporal dimension to the tiling approach by alternating between multiple tiling schemes across different input holograms. Instead of using a single static tiling configuration, the system cycles through different tiling arrangements (first tiling scheme, second tiling scheme, etc.), effectively utilizing the time dimension to smooth optical effects and ensure comprehensive use of display pixels across the sequence of holograms.
3Ease of operation
If a single tiling scheme is used for all input holograms, then the system is easier to control, but artefacts and optical noise are not minimized, reducing image quality
Solution Approach 1:
The patent implements periodic action by alternating between multiple tiling schemes in a systematic sequence. The tiling engine cycles through different tiling configurations (first tiling scheme for one input hologram, second tiling scheme for the next, and potentially repeating the sequence). This periodic variation in tiling approaches minimizes artefacts and optical noise through temporal averaging while maintaining systematic and manageable control through the defined sequence.
4Manufacturing precision
If dynamic tiling schemes are implemented to reduce artefacts, then image quality improves, but the computational complexity increases
Solution Approach 1:
The patent implements dynamic tiling schemes where the tiling configuration changes over time between different input holograms. The tiling engine dynamically adjusts the mapping of input hologram pixels to display device pixels, alternating between multiple tiling schemes (e.g., first tiling scheme for one input hologram, second tiling scheme for the next). This dynamic approach smooths optical effects and reduces artefacts while maintaining manageable system complexity through systematic control.
Solution Approach 2:
The patent implements periodic action by alternating between multiple tiling schemes in a systematic sequence. The tiling engine cycles through different tiling configurations (first tiling scheme for one input hologram, second tiling scheme for the next, and potentially repeating the sequence). This periodic variation in tiling approaches minimizes artefacts and optical noise through temporal averaging while maintaining systematic and manageable control through the defined sequence.
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 dynamic tiling scheme enhances the quality of holographic reconstructions by minimizing artefacts and noise, achieving higher resolution and more uniform image spots, which improves the packing density and perceived quality of the holographic projections.
Implementation Method 1
Each pixel is an individually-addressable liquid crystal cell having birefringence. Each pixel may modulate the amplitude and/or phase of light in accordance with a corresponding hologram pixel.
Implementation Method 2
The light is diffracted by the spatial light modulator. The complex light pattern emanating from the display device interferes at a replay plane to form a holographic reconstruction corresponding to the target image.
Implementation Method 3
The complex light pattern emanating from the display device interferes at a replay plane to form a holographic reconstruction corresponding to the target image.
Data Source
AI summary
There is provided a driver for a spatial light modulator. The spatial light modulator comprises [m×n] pixels. The driver is arranged to receive input holograms each comprising [x×y] pixels, wherein m≥x and n≥y. The driver is further arranged to drive the spatial light modulator to display thereon output holograms each comprising [m×n] pixels by tiling each input hologram onto the pixels of the spatial light modulator to form an output hologram corresponding to each input hologram using a tiling scheme. The driver is arranged to use a first tiling scheme to display a first output hologram and a second tiling scheme to display a second output hologram. Each output hologram comprises a plurality of tiles of the input hologram. Each tiling scheme defines the size of each tile and the position of each tile on the pixels of the spatial light modulator.