반사형 쌍안정 카이랄 스플레이 네마틱 액정표시소자
Reflective Bistable Chiral Splay Nematic Liquid Crystal Display
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Bistable chiral splay nematic liquid crystal display (BCSN LCD) is a memory type liquid crystal display using splay and –π twist states as two stable states. When the cell thickness to pitch (d/p) ratio is 0.25, splay and –π twist states have permanent memory time. However, when the transition from –π twist state to splay state is caused by a fringe field, pixel regions show that the splay state is not perfect, but rather includes a contribution from the –π twist state. In this paper, we propose a reflective BCSN LCD using –π twist state in which the two stable states do not coexist. The fabricated reflective BCSN LC cell shows a high contrast ratio of over 30:1 and response times of 950 ms and 450 ms in vertical and fringe field switching, respectively. The proposed cell also shows wide viewing angle characteristics of 180° in left- and right directions.
Abstract
Bistable chiral splay nematic liquid crystal display (BCSN LCD) is a memory type liquid crystal display using splay and –π twist states as two stable states. When the cell thickness to pitch (d/p) ratio is 0.25, splay and –π twist states have permanent memory time. However, when the transition from –π twist state to splay state is caused by a fringe field, pixel regions show that the splay state is not perfect, but rather includes a contribution from the –π twist state. In this paper, we propose a reflective BCSN LCD using –π twist state in which the two stable states do not coexist. The fabricated reflective BCSN LC cell shows a high contrast ratio of over 30:1 and response times of 950 ms and 450 ms in vertical and fringe field switching, respectively. The proposed cell also shows wide viewing angle characteristics of 180° in left- and right directions.
참고문헌 (11)
- R. A. Soref, "Electrically controlled birefringence of thin nematic film", J. Appl. Phys, 43, pp.2029~2037 (1972)
- M. Oh-e, "Electro-optic characteristics and switching behavior of the in-plane switching mode", Appl. Phys. Lett, 67, pp.3895~3897 (1995)
- S. H. Lee, "Electro-optic characteristics and switching principle of a nematic liquid crystal cell controlled by fringe-field switching", Appl. Phys. Lett, 73, pp.2881~2883 (1998)
- F. S.-Y. Yeung, "Fast-response no-bias-bend liquid crystal displays using nanostructured surfaces", Appl. Phys. Lett, 88, pp.063505-1~063503-3 (2006)
- D. W. Berreman, "New bistable cholesteric liquid-crystal display", Appl. Phys. Lett, 37, pp.109~111 (1980)
- D. W. Berreman, "New bistable liquid-crystal twist cell", J. Appl. Phys, 52, pp.3032~3039 (1981)
- A. J. Davidson, "Flexoelectric switching in a bistable nematic device", Physical Review E, 65, pp.051710-1~051710-10 (2002)
- S. H. Lee, "Bistable chiral-splay nematic liquid crystal device using horizontal switching", Appl. Phys. Lett, 82, pp.4215~4217 (2003)
- J.-X. Guo, "Three-terminal bistable twisted nematic liquid crystal displays", Appl. Phys. Lett, 77, pp.3716~3718 (2000)
- C. D. Hoke, "Multidimensional alignment structure for the liquid crystal director field", J. Appl. Phys, 88, pp.2302~2304 (2000)
- C. G. Jhun, "Gray scale of bistable chiral splay nematic device in the splay transition", Mol. Cryst. Liq. Cryst, 527, pp.168~173 (2010)