PTFE Drawn Films as Alignment Agents for Liquid Crystals
作者:
Garry Lester,
James Hanmer,
Harry Coles,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 262,
issue 1
页码: 149-156
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508033521
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
It has been reported that thin films of Poly-tetra-fluoro-ethylene (PTFE) deposited in a suitable manner will induce alignment in a liquid crystal1. These films are deposited in a one step dry process which offers advantages over polyimide or SiO2alignment layer application methods. Investigations of the effect of application conditions (pressure, temperature, deposition velocity) of this type of alignment layer on the quality of alignment in liquid crystals have been carried out. The surface pretilt angle induced in the liquid crystal by such an alignment layer has been measured and the PTFE films induce a low surface pretilt angle of the order of 1°. Some results of attempts to control this pretilt value by varying the conditions under which the alignment layer is deposited are presented. TN devices utilising PTFE alignment layers have been constructed and operating characteristics shown to be comparable to those for devices utilising commercially available polyimide alignment layers. There is a significant reduction in the threshold voltage of the PTFE aligned device as compared to that of a polyimide aligned device both having similiar slope characteristics.
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