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http://dx.doi.org/10.5370/KIEEP.2013.62.4.223

Electro-Optical Characteristics of the UV Aligned LCD Cell  

Lee, Byung-Soon (서일대학 전기과)
Lee, Ho-Young (초당대학교 정보통신공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.62, no.4, 2013 , pp. 223-226 More about this Journal
Abstract
In this study, we investigated the electro-optical(EO) characteristic of fringe-field switching(FFS) mode cell by the two kinds of ultraviolet(UV) alignment method on the organic thin film(polyimide: PI). The suitable organic layersfor FFS cell and the aligning capabilities of nematic liquid crystal(NLC) using the in-situ photoalignment method were studied Disclination is observed after conventional photoalignment method for 1h, and in-situ photoalignment method for 1h. Monodomain alignment of the NLC can be observed via in-situ photoalignment method for 2h and 3h. It is considered that NLC alignment is due to photo-depolymerization of the polymer with oblique non-polarized UV irradiation on PI surface. An unstable V-T curve of UV-aligned FFS-LCD with conventional photoalignment method can be achieved. However, a stable V-T curve of UV-aligned FFS-LCD with in-situ photoalignment method(1h), and V-T curve of UV-aligned FFS-LCD with in-situphotoalignment method was much stable comparing with that of other UV-aligned FFS-LCD's. As a result, more stable EO performanceof UV-aligned FFS-LCD with in-situphotoalignment method for 3h is obtained than that of the other UV-aligned FFS-LCD's.
Keywords
EO characteristics; Liquid crystal; Nematic Liquid crystal; Ultra violet alignment;
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