Abstract
Abstract 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 SiO2 alignment 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...
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