Screening Effect of a-C:H Alignment Layer and its Influence on Characteristics of LC Cells

Abstract

The influence of the hydrogenated carbon alignment layer electrostatic screening effect on characteristics of dual frequency nematic liquid crystal was investigated. The screening effect was declined as the result of the threshold voltage reduction from 6 V to 1 V connected with the fourfold decrease in alignment layer thickness. The pretilt angle rising and the phase retardation reduction were observed at the same time. It is shown that hydrogenated carbon alignment layer application is able to change electrical properties of the cells as well as to accelerate the switching time at the wavelength of 1.55 μm.

Keywords:

• amorphous hydrogenated carbon
• alignment layer
• pretilt angle
• switching time