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Review Paper : Emerging vertical‐alignment liquid‐crystal technology associated with surface modification using UV‐curable monomer
Author(s) -
Lee Seung Hee,
Kim Sung Min,
Wu ShinTson
Publication year - 2009
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/jsid17.7.551
Subject(s) - materials science , liquid crystal , monomer , transmittance , polymer , substrate (aquarium) , liquid crystal display , surface modification , polymerization , azimuth , optoelectronics , electric field , optics , chemical engineering , composite material , oceanography , physics , quantum mechanics , engineering , geology
— The recent development of polymer‐induced pretilt angle in multi‐domain vertical‐alignment liquid‐crystal (LC) structures is reviewed. To create a small but well‐defined pretilt angle, ∼0.1 wt.% of a photo‐curable monomer was mixed in an LC host and a bias voltage was applied to reorient the LC directors within each domain. The monomers are polymerized near the substrate surfaces by UV exposure. The formed polymer layers change the surface pretilt angle of the LC from 90° to about 89° with a defined azimuthal orientation. Consequently, within each domain the LC reorientation direction responding to the external field is well‐defined which leads to faster rise time and higher transmittance. This new technology overcomes the long standing problems of conventional MVA devices and is therefore expected to play a dominant role in the future.