EO characteristics for a photoaligned VA‐1/4 π cell on a photopolymer layer |
| |
Authors: | Jeoung‐Yeon Hwang Yong‐Je Jeon Yong‐Min Jo Dae‐Shik Seo |
| |
Abstract: | The generation of a liquid‐crystal (LC) tilt angle on a copolymer with chalconyl and cholesteryl moiety characteristics was performed, and the electro‐optical (EO) performance of the photoaligned vertical‐alignment (VA) 1/4 π cell by polarized UV exposure on a homeotropic photopolymer surfaces was studied. The LC tilt angles decreased as UV exposure time increased on the copolymer surfaces. A tilt angle of 87° in NLC was observed with an UV exposure of 3 min on the photoalignment‐2 surface. The LC tilt angle is attributed to increased chalcone moiety with increasing UV exposure time. Excellent voltage‐transmittance (V‐T) curves of the photoaligned VA 1/4 π cell by polarized UV exposure on the photopolymer surface for 3 min containing a cholesteryl moiety of 8% were obtained. The V‐T and response‐time characteristics can be improved by the presence of a cholesteryl moiety in the photopolymer. |
| |
Keywords: | Vertical alignment electro‐optical (EO) characteristics nematic liquid crystal photopolymer VA 1/4 π cell |
|