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Characterization protocol to evaluate chiral smectic liquid crystals for high-end display applications

J. M. S. Pena, V. Urruchi, I. Pérez, and C. Vázquez

Open Access Open Access

Abstract

A protocol based on systematic experimental measurements to characterize the electro-optic behavior of chiral smectic liquid-crystal (LC) materials with V/W-shaped responses is presented. An experimental smectic LC material has been checked by use of this protocol. It has been found that results derived from this procedure permit a reasonable evaluation of the electro-optic performance of these LC materials as well as their capability to be used in high-end display applications.

©2004 Optical Society of America

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Figures (7)
Fig. 1.
Fig. 1. Measurement of the apparent tilt angle.

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Fig. 2.
Fig. 2. Optical transmission for different frequencies of the triangular waveform applied to the LC cell.

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Fig. 3.
Fig. 3. (a) Voltage waveform and (b) optical transmission of the LC device in the time domain.

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Fig. 4.
Fig. 4. (a) Driving waveform and (b) the gray scale obtained in the time domain.

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Fig. 5.
Fig. 5. Microscopic photographs of a generated gray scale.

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Fig. 6.
Fig. 6. Effect of saturation pulse on the transmission memory of the LC device.

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Fig. 7.
Fig. 7. (a) Triangular waveform applied to the cell and measured switching current, (b) polarization-voltage characteristic obtained, and (c) W-shaped optical transmission measured for the LC device studied.

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Tables (1)

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Table 1. Slot times and voltage levels of the waveform applied to the test cell to generate a gray scale.

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