This work discusses the effect of photo-alignment in a liquid-crystal
film that is doped with nanoparticles and azo-dye. The vertical alignment
that is induced by nanoparticles of polyhedral oligomeric silsesquioxanes
can be changed into homogeneous alignment by the absorption of
photo-excited azo-dye. Both electro-optical and surface properties are
analyzed to confirm this phenomenon. An electrically tunable
polarization-dependent LC phase grating is produced using the method.
By this method, we also present a transflective liquid crystal display
with a single cell-gap in a dual-alignment configuration. This dual
structure was fabricated via a single-step laser-light exposure through a
photomask. The vertical alignment induced by nanoparticles of
polyhedral oligomeric silsesquioxanes can be changed into a
homogeneous alignment via absorption of photo-excited azo dye. The LC
molecules at the transmissive and reflective pixels are homogeneous and
hybrid alignment, respectively, at which optimal phase retardations of
half and quarter wavelengths are achieved.
Both nanoparticle- and azo-dye-induced vertical and homogeneous
alignments are non-contact alignment processes and have potential for
practical application.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0718109-145727 |
| Date | 18 July 2009 |
| Creators | Chen, Wen-zheng |
| Contributors | Andy Ying-Guey Fuh, Tsung-Hsien Lin, Chi-Huang Lin, Shie-Chang Jeng, Wen-Jung Zheng |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0718109-145727 |
| Rights | withheld, Copyright information available at source archive |
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