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35.2: Direct Observation of Disclination Evolution in Vertically Aligned Liquid Crystal Light Valves
Author(s) -
Zhang Shiyong,
Lu Minhua,
Yang K. H.
Publication year - 2000
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1833100
Subject(s) - disclination , liquid crystal , optics , materials science , checkerboard , coupling (piping) , transformation (genetics) , liquid crystal display , physics , geometry , chemistry , mathematics , biochemistry , gene , metallurgy
The dynamic evolution processes of fringe‐field induced disclinations of vertically aligned LC light valves were directly imaged for the first time by using a CCD camera with 1 ms time resolution. Various switching patterns corresponding to different fringe fields, full off (dark) to full on (bright), interlaced column on and off to full on, checkerboard on to full on, have been studied. Experimental results show that, due to the elastic coupling, the transformation speed of LC directors at the location of disclination between two topologically in‐equivalent states depends strongly on display patterns. The observed transformation speed varies from milliseconds to about one second, depending on the alignment conditions.