A near-infrared Stokes parameter method for determining two-dimensional cell thickness and twist angle distributions of liquid crystal color displays

Marenori Kawamura; Susumu Sato

doi:10.1117/12.452482

12 December 2002 Near-infrared stokes parameter method for determining two-dimensional cell thickness and twist angle distributions of liquid crystal color displays

Marenori Kawamura, Susumu Sato

Author Affiliations +

Proceedings Volume 4799, Liquid Crystals VI; (2002) https://doi.org/10.1117/12.452482
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

We propose a two-dimensional (2D) and hyperfine measurement method for precisely determining cell parameter distributions such as a cell thickness and twist angle in color liquid crystal (LC) displays. The 2D cell thickness and twist angle distributions can easily be determined by measuring Stokes parameters of all pixels for red, green and blue in LCD panel at a wavelength of near-infrared region, because the transmission light at the wavelength is not absorbed by each color filter. In addition, the spatial resolution can be improved by increasing the magnification of the objective lens in front of a high resolution CCD camera. These cell parameters of each pixel in the practical LCD panel are compared and discussed.

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Marenori Kawamura and Susumu Sato "Near-infrared stokes parameter method for determining two-dimensional cell thickness and twist angle distributions of liquid crystal color displays", Proc. SPIE 4799, Liquid Crystals VI, (12 December 2002); https://doi.org/10.1117/12.452482

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