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Proceedings Paper

Regional gamma curve calibration of liquid crystal SLM for holographic display
Author(s): Tao Zhao; Juan Liu; Qiankun Gao; Junyi Duan
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Paper Abstract

The liquid crystal spatial light modulator is able to provide flexible wavefront modulation, whereas its nonlinear and spatial varying phase response will influence the modulation accuracy. In this paper, a software based C++ algorithm are designed to calibrate these distortions regionally. Twyman-Green interference method is utilized for gray versus phase shift measurement. The curvature of cover glass is measured by phase shift algorithm. Finally the entire panel is divided into several local regions to overcome the spatial varying phase response. For each sub-region, the nonlinear phase response is calibrated by remapping table. For a Jasper 4K SLM panel, when three local regions are built, the root mean error of linear phase shift is reduced to approximate 0.1 rad. The calibrated SLM is applied for holographic display and the improvement ratios of structural similarity index reach 30.6%, 62.5%, and 43.6% for R, G, and B reconstructed components respectively.

Paper Details

Date Published: 19 February 2018
PDF: 7 pages
Proc. SPIE 10558, Practical Holography XXXII: Displays, Materials, and Applications, 105580N (19 February 2018); doi: 10.1117/12.2294990
Show Author Affiliations
Tao Zhao, Beijing Institute of Technology (China)
Juan Liu, Beijing Institute of Technology (China)
Qiankun Gao, Beijing Institute of Technology (China)
Junyi Duan, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 10558:
Practical Holography XXXII: Displays, Materials, and Applications
Hans I. Bjelkhagen; V. Michael Bove, Editor(s)

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