We studied the nematic liquid crystal (NLC) alignment capability by the UV alignment method on a a-C:H thin-film surface, and investigated electro-optical performances of the UV aligned twisted nematic (TN)- liquid crystal display (LCD) with the UV exposure on a-C:H thin film surface. A good LC alignment by UV irradiation on a a-C:H thin-film surface at a layer thickness of 200A° was achieved. Also, a good LC alignment by the UV alignment method on the a-C:H thin film surface was observed at an annealing temperature of 180°C. However, the alignment defect of the NLC was observed at an annealing temperature above 200°C. Monodomain alignment of the UV aligned TN-LCD can be observed. The best electro-optical (EO) characteristics of the UV aligned TN-LCD in the photoaligned TN-LCDs was observed with oblique ion beam exposure on the a-C:H thin film surface for 1 min.
Bibliographical noteFunding Information:
Keywords: a-C:H thin film; electro-optical (EO) characteristics; nematic liquid crystal; UV exposure This work was supported by National Research Laboratory program (M1-0203-00-0008) & the Ministry of Information & Communications of Korea under the Information Technology Research Center (ITRC) Program.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics