Alignment of antiferroelectric liquid crystals for high contrast displays

Citation
R. Beccherelli et Sj. Elston, Alignment of antiferroelectric liquid crystals for high contrast displays, DISPLAYS, 20(4), 1999, pp. 185-190
Citations number
17
Categorie Soggetti
Computer Science & Engineering
Journal title
DISPLAYS
ISSN journal
01419382 → ACNP
Volume
20
Issue
4
Year of publication
1999
Pages
185 - 190
Database
ISI
SICI code
0141-9382(199912)20:4<185:AOALCF>2.0.ZU;2-9
Abstract
We have experimentally investigated the causes of the poor quality of align ment in antiferroelectric liquid crystals devices. The techniques for its i mprovement are also evaluated. Our results show that using only one rubbed substrate may not be suitable for practical displays because of a tendency for layer rotation to occur even when a symmetrical driving waveform is use d. Hence we have investigated the effect of offsetting the rubbing directio n on the opposite glass plates. The evaluation of the electrooptical perfor mance of our devices clearly shows that there exists a value of the skew, w hich gives virtually ideal alignment quality, with values of the extinction ratio in excess of 2000:1. By using this rubbing technique our displays sh ow stable behaviour. (C) 1999 Elsevier Science B.V. All rights reserved.