Parallel Phase Distribution Generation for Projection Devices
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Solution Overview
Problem
Existing projection methods using phase modulation type spatial modulation elements face challenges in displaying high-quality target images in real-time due to high calculation costs, leading to delays and deviations from real-time states, and require recalculation for clear images, especially when the target image state changes during hologram generation.
Innovation Solution
A projection device and method that utilize parallel processing by different arithmetic units to generate and display phase distributions, with a lower calculation cost first and a higher calculation cost second, allowing for immediate display of a clear target image while shortening the time to display, using a spatial modulation element that reflects light from a light source and projects the phase distributions onto a display surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If iterative Fourier transform method is used to generate phase distribution for high-quality target image, then image quality is improved, but calculation time increases enormously causing processing delay
Solution Approach 1:
The patent segments the phase distribution generation process into two independent parallel processing paths: first processing that generates phase distribution with lower calculation cost for rapid display, and second processing that generates phase distribution with higher calculation cost for high-quality display. This segmentation allows both processing paths to operate simultaneously without blocking each other, resolving the contradiction between image quality and calculation time.
Solution Approach 2:
The first processing performs partial action by generating phase distribution with lower calculation cost (using fewer iterations or simplified algorithms), which is sufficient for rapid display but not for optimal image quality. The second processing performs excessive action by generating phase distribution with higher calculation cost to achieve high-quality images. Both actions are executed in parallel, allowing the system to benefit from both speed and quality without compromising either.
2Measurement precision
If iterative Fourier transform method iterates processing many times to converge, then phase distribution accuracy is improved, but processing delay increases
Solution Approach 1:
The patent divides the phase distribution generation into two segmented processing paths with different iteration counts or complexity levels. The first processing uses fewer iterations for rapid convergence, while the second processing uses more iterations for high accuracy. Both paths process the same input simultaneously, eliminating the time delay caused by sequential processing.
Solution Approach 2:
The first processing performs preliminary action by generating a phase distribution quickly with lower calculation cost, which can be displayed immediately while the second processing continues to refine the result. This preliminary action ensures that the system always has a displayable output ready, eliminating processing delay while maintaining the option for high accuracy when needed.
3Speed
If clear target image is displayed immediately, then display speed is improved, but image quality becomes unclear requiring recalculation
Solution Approach 1:
The patent segments the display output into two quality levels corresponding to two processing paths. The first processing output provides rapid display with acceptable quality, while the second processing output provides high-quality display. Both outputs are available simultaneously from parallel processing, allowing the system to display clear images immediately without requiring recalculation when quality needs improvement.
Solution Approach 2:
The first processing performs partial action by generating phase distribution with lower calculation cost for immediate display, ensuring fast display speed. The second processing performs excessive action by generating phase distribution with higher calculation cost to ensure high image quality. Both actions complete in parallel, so the system achieves both fast display and high quality without recalculation.
4Device complexity
If single processing path is used to generate phase distribution, then device complexity is reduced, but adaptability to changing target image states is limited
Solution Approach 1:
The patent segments the processing structure into multiple independent arithmetic units that can operate in parallel. Each unit generates phase distribution independently, allowing the system to adapt to changing target image states by switching between different processing paths or combining their outputs. This segmentation increases adaptability while keeping each individual processing unit relatively simple.
Solution Approach 2:
The patent creates a dynamic processing system where multiple phase distribution generation paths operate simultaneously and can be selectively activated or deactivated based on real-time needs. The system can dynamically switch between first processing (lower cost, faster) and second processing (higher cost, higher quality) depending on the changing target image states, providing adaptability without requiring a completely complex processing architecture.
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 the rapid and clear display of target images while minimizing processing time and noise, allowing for real-time updates and maintaining image quality without the need for continuous recalculation.
Implementation Method 1
a phase modulation type spatial modulation element... displaying a phase distribution for projecting the target image on a display surface of the spatial modulation element and projecting reflected light of light irradiated on the display surface
Implementation Method 2
a spatial modulation element reflecting light from the light source by a display unit that displays a phase distribution
Data Source
AI summary
A projection device is provided for finally displaying a clear desired target image while shortening time until the target image is displayed, the projection device including: a light source; a spatial modulation element reflecting light from the light source by a display unit displaying a phase distribution of a target image; a modulation element control means that performs, in parallel by different arithmetic units, first processing of generating a phase distribution of the target image and second processing of generating a phase distribution of the target image by processing with a calculation cost higher than the first processing, and displays a phase distribution generated by the second processing on a display surface of the spatial modulation element after displaying a phase distribution generated by the first processing on a display surface of the spatial modulation element; and a projection means that projects reflected light from the spatial modulation element.