Phase Spatial Light Modulator With Brightness-Zone Holograms
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Solution Overview
Problem
Computing holograms for phase spatial light modulators (PSLMs) in high dynamic range (HDR) displays or projectors is computationally intensive and expensive, with existing frame-by-frame iterative Fourier transform analysis techniques adding frame delay.
Innovation Solution
A system comprising a spatial light modulator (SLM) and a phase spatial light modulator (PSLM) optically coupled with control circuitry that determines sub-holograms for brightness zones, combines them to produce a target hologram, and adjusts pixel arrays accordingly, reducing computational overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If frame-by-frame iterative Fourier transform analysis is used to compute holograms for PSLM, then high dynamic range imaging quality is improved, but computational complexity and frame delay increase
Solution Approach 1:
The patent divides the hologram computation into multiple brightness zones, where each zone is processed independently to generate sub-holograms. These sub-holograms are then combined to form the final target hologram. This segmentation approach reduces the computational burden on a single frame while maintaining high dynamic range imaging quality across different brightness levels.
Solution Approach 2:
The patent pre-computes and stores baseline holograms for different brightness zones before actual image processing. During operation, these pre-computed baseline holograms are retrieved and adjusted to generate the target hologram, eliminating the need for time-consuming real-time iterative Fourier transform analysis while maintaining imaging quality.
2Speed
If real-time hologram computation is performed for PSLM control, then display responsiveness is improved, but computational cost and processing time increase
Solution Approach 1:
The system pre-computes baseline holograms for various brightness zones and stores them in advance. During real-time operation, these pre-computed holograms are retrieved and adjusted rather than computing them on-the-fly, significantly reducing computational cost while maintaining display responsiveness.
Solution Approach 2:
The patent uses copies of pre-computed baseline holograms that have been stored in memory. Instead of performing expensive real-time hologram computation, the system retrieves and adjusts these pre-computed copies, reducing processing time and computational resources while maintaining image quality and responsiveness.
3Measurement precision
If iterative Fourier transform analysis is applied to compute holograms, then hologram accuracy is improved, but processing time and frame delay increase
Solution Approach 1:
The patent performs the computationally intensive iterative Fourier transform analysis in advance to generate baseline holograms, which are then stored for later use. During actual display operation, these pre-computed holograms are retrieved and adjusted, eliminating frame delay while maintaining hologram accuracy through the use of pre-optimized baseline values.
Solution Approach 2:
The system creates and stores copies of accurately computed baseline holograms that can be retrieved during operation. These pre-computed copies maintain the accuracy achieved through iterative Fourier transform analysis while eliminating the time delay associated with real-time computation, as the accurate holograms are already available from previous processing.
Data Source
AI summary
A system includes: a spatial light modulator (SLM) having a first array of pixels; a phase spatial light modulator (PSLM) optically coupled to and illuminating the SLM, the PSLM having a second array of pixels; and control circuitry coupled to the SLM and PSLM. The control circuitry is configured to: obtain a baseline hologram; determine sub-holograms for a plurality of brightness zones responsive to the baseline hologram and respective brightness zone transforms; combine the sub-holograms to produce a target hologram; provide the target hologram to the PSLM; and provide a control data to the SLM. The SLM is configured to adjust the first array of pixels responsive to the control data. The PSLM is configured to adjust the second array of pixels responsive to the target hologram.