Multi-channel liquid crystal cell parameter measurement technique

Chih-Shang Liu; Kai-Ping Chuang; Yeo-Sung Lin; Ming-Yin Zhuang; Chih-Jung Chiang

doi:10.1117/12.827084

10 September 2009 Multi-channel liquid crystal cell parameter measurement technique

Chih-Shang Liu, Kai-Ping Chuang, Yeo-Sung Lin, Ming-Yin Zhuang, Chih-Jung Chiang

Proceedings Volume 7432, Optical Inspection and Metrology for Non-Optics Industries; 743217 (2009) https://doi.org/10.1117/12.827084
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

We propose a novel multi-channel liquid crystal cell parameter measurement system, which combines the spectroscopic ellipsometry technique with the hyperspectral imaging spectrograph for the multi-point measurement. This system is based on PSA setup (polarizer-sample-analyzer) to measure normalized transmission spectrum for analyzing properties of homogeneous cell and MVA cell. We also develop a theoretical method to simplify the calculation of the orientation angle of liquid crystal cells for speeding up the measurement. The liquid crystal cell gap can be calculated by the measured retardation and the given refractive indices of specified wavelength. The pretilt angle is also analyzed by multi-channel measurement system. We present the analysis of hyperspectral imaging spectrograph and the orientation angle measurement by direct calculation method for high speed on-line multi-channel liquid crystal cell parameter measurement.

Citation Download Citation

Chih-Shang Liu, Kai-Ping Chuang, Yeo-Sung Lin, Ming-Yin Zhuang, and Chih-Jung Chiang "Multi-channel liquid crystal cell parameter measurement technique", Proc. SPIE 7432, Optical Inspection and Metrology for Non-Optics Industries, 743217 (10 September 2009); https://doi.org/10.1117/12.827084

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KEYWORDS

Liquid crystals

Polarization

Spectrographs

Polarizers

Data modeling

Hyperspectral imaging

LCDs

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