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Proceedings Paper

PTFE alignment for rapid prototyping of LCDs
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Paper Abstract

Films of Poly-Tetra-Fluoro-Ethylene (PTFE) have been shown to be very effective alignment agents for liquid crystal materials. Such films may be deposited in a one step dry process offering advantages in terms of both time and simplicity over deposition of polyimide or SiO2 alignment layers. This is most appropriate for applications where a test device is required as part of a rapid prototype for ergonomic and similar testing. Earlier work has identified suitable deposition parameters (temperature, surface pressure, velocity) for production of PTFE films but with single films there is still typically some variation in the alignment due to the machined surface of the PTFE bar itself. In this work multiple film deposition using a 'step and repeat' has been investigated as means of achieving improved alignment uniformity and has been found effective in test devices of several cm2. Electro-Optic measurements on a multiple pixel test device show little spatial variation in the threshold voltage illustrating the possibility of matrix addressing a PTFE aligned prototype device. In conclusion PTFE films offer a very rapid method of producing alignment layers for devices having reproducible and uniform electro-optic characteristics.

Paper Details

Date Published: 27 June 2002
PDF: 6 pages
Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); doi: 10.1117/12.472195
Show Author Affiliations
Garry Lester, Univ. of Exeter (United Kingdom)
Harry J. Coles, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 4759:
XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications
Jolanta Rutkowska; Stanislaw J. Klosowicz; Jerzy Zielinski, Editor(s)

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