Holographic Projector Sampling Sub-Images to Reduce Crosstalk
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Solution Overview
Problem
Holographic projectors face challenges with pixel crosstalk and limited frame rates due to the finite size of image pixels and the time-consuming process of calculating holograms, which affects the quality and speed of image projection.
Innovation Solution
A holographic projector system that generates secondary images by sampling a primary image, reducing the number of pixels and calculating holograms for each secondary image, allowing for concurrent or sequential display on multiple zones or devices to minimize crosstalk and increase frame rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of pixels in the hologram is increased to improve image resolution, then image quality improves, but pixel crosstalk increases and calculation time increases
Solution Approach 1:
The patent divides the original high-resolution image into multiple lower-resolution sub-images (e.g., 4 sub-images for a 2x2 segmentation). Each sub-image contains a subset of the original pixels, reducing the pixel density and minimizing crosstalk between adjacent pixels while maintaining the overall image resolution through composite display.
Solution Approach 2:
The patent transitions from displaying a single high-resolution hologram in one temporal slot to displaying multiple lower-resolution holograms across multiple temporal slots. This temporal dimension expansion allows the system to achieve equivalent image resolution through time-multiplexed display of segmented sub-images.
2Manufacturing precision
If the number of pixels in the hologram is increased to improve image resolution, then image quality improves, but calculation time increases
Solution Approach 1:
The patent segments the computationally intensive hologram calculation into multiple smaller, independent calculations for each sub-image. By dividing a large N×N pixel hologram calculation into several smaller (N/2)×(N/2) calculations, the overall computation time is reduced while the final composite image maintains N×N resolution.
Solution Approach 2:
The patent calculates holograms for only a subset of pixels at any given time through sub-sampling, rather than calculating all pixels simultaneously. This partial action approach reduces the computational burden per frame while maintaining acceptable image quality through temporal multiplexing of multiple sub-frames.
3Productivity
If the frame rate is increased to improve video projection speed, then productivity improves, but image quality deteriorates due to reduced calculation time
Solution Approach 1:
The patent segments each video frame into multiple sub-frames that can be processed and displayed independently at higher speeds. By dividing one complex full-resolution frame into several simpler sub-frames, the system achieves higher effective frame rates while maintaining overall image quality through the combination of multiple sub-frames.
Solution Approach 2:
The patent processes and displays partial image information (sub-sampled sub-frames) at higher frame rates rather than waiting for complete full-resolution frames. This partial action allows the system to achieve acceptable frame rates for video projection while the cumulative effect of multiple sub-frames maintains image 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
This approach improves image quality by reducing pixel crosstalk and enhances frame rates, enabling faithful and complete holographic reconstructions while maintaining flexibility in holographic projector design.
Implementation Method 1
Light modulation may be achieved using electrically-addressable liquid crystals, optically-addressable liquid crystals or micro-mirrors
Implementation Method 2
Light scattered from an object contains both amplitude and phase information. This amplitude and phase information can be captured on, for example, a photosensitive plate by well-known interference techniques to form a holographic recording
Data Source
AI summary
A holographic projector comprises an image processing engine, a hologram engine, a display engine and a light source. The image processing engine is arranged to receive a source image for projection and generate a plurality of secondary images from a primary image based on the source image. The source image comprises pixels. Each secondary image may comprise fewer pixels than the source image. The plurality of secondary images are generated by sampling the primary image. The hologram engine is arranged to determine, such as calculate, a hologram corresponding to each secondary image to form a plurality of holograms. The display engine is arranged to display each hologram on the display device. The light source is arranged to Illuminate each hologram during display to form a holographic reconstruction corresponding to each secondary image on a replay plane. The primary image is selected from the group comprising: the source image and an intermediate image.