Response time mechanism for a photo-aligned vertical-alignment liquid crystal display on a homeotropic alignment layer |
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| Authors: | Dae-Shik Seo Doo-Seok Park Hee-Jong Jeon |
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| Affiliation: | Department of Electrical Engineering, College of Engineering, Soongsil University, 1-1 Sangdo 5-dong, Dongjack-ku, Seoul 156-743, Korea |
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| Abstract: | The electro-optical characteristics of the photo-aligned vertical-alignment liquid crystal display (VA-LCD) with a non-polarized UV exposure of 45° on homeotropic polyimide (PI) surface was investigated. The domain size of the photo-aligned VA-LCD increases proportionately with the UV exposure time. The LC alignment of the photo-aligned VA-LCD is attributed to photo-dissociation of the polymer by UV exposure on the homeotropic PI surface. Good voltage-transmittance characteristics of the photo-aligned VA-LCD without negative compensation film was measured. The response time of the photo-aligned VA-LCD was slow compared with a rubbing-aligned VA-LCD; this is considered to be due to the alignment of LC molecules. |
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