| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 174543 | Current Opinion in Chemical Engineering | 2013 | 8 Pages |
The alignment of liquid crystal (LC) molecules at display boundaries is the major factor determining the electro-optical performance of liquid crystal display (LCD) devices. Most LC alignments are induced by interactions with the alignment material layer, whose surface is in physical contact with the LC molecules in LCD devices. Despite its importance, the mechanism governing the alignment of LC molecules on alignment layers is still not well understood. This review discusses the major factors controlling LC alignment and the polymer materials used.
► Unidirectional rubbing of the substrates afforded uniform uniaxial LC alignment. ► Photo-alignment approach has shown to be promising alternative to the rubbing process. ► Uniform uniaxial LC alignment has been confirmed to be governed mainly by its molecular interactions with the polymer chains. ► Several thermally stable polyimides have met most requirements for LC alignment as well as complete fabrication of LCD devices. ► New alignment materials are required to meet elimination of image sticking and related issues [e.g. multistable and optically rewritable LCDs].
