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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Simple parameter determination for twisted nematic liquid-crystal display.

Wen-chi Hung¹, Ming-shan Tsai, Chien-ren Wang

¹Institute of Electro-Optical Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan.

|May 22, 2007

Summary

A new method accurately measures twisted nematic liquid-crystal display (TN-LCD) cell parameters. This technique determines cell gap, twist angle, and twist sense using reflectance and transmittance measurements.

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Area of Science:

Materials Science
Optoelectronics
Physics

Background:

Twisted nematic liquid-crystal displays (TN-LCDs) are crucial in optoelectronic devices.
Accurate characterization of TN-LCD cell parameters is essential for performance optimization.
Existing measurement methods can be complex or lack precision.

Purpose of the Study:

To propose a simple and accurate measurement method for TN-LCD cell parameters.
To enable precise determination of cell gap, twist angle, and twist sense.
To provide a practical tool for TN-LCD fabrication and analysis.

Main Methods:

Measurement of maximum reflectance and transmittance of a TN-LCD.
Rotation of a polarizer to a specific angle relative to the liquid crystal director.
Application of Jones matrix theory for parameter calculation.
Utilizing a small external voltage to determine twist sense.

Main Results:

The proposed method accurately determines the cell gap of a TN-LCD.
The twist angle of the TN-LCD is precisely calculated.
The twist sense is easily identified by observing the effect of a small applied voltage.

Conclusions:

A straightforward and accurate method for measuring TN-LCD cell parameters has been developed.
This technique facilitates the determination of cell gap, twist angle, and twist sense.
The method offers a valuable tool for the characterization and development of TN-LCD technology.