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Response time mechanism for a photo-aligned vertical-alignment liquid crystal display on a homeotropic alignment layer

Dae‐Shik Seo, Doo-Seok Park, Hee-Jong Jeon

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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Key concepts: Homeotropic alignment, Materials science, Liquid-crystal display, Rubbing, Polyimide, Liquid crystal, Layer (electronics), Optoelectronics