Browse > Article
http://dx.doi.org/10.3807/KJOP.2011.22.1.023

Reflective Bistable Chiral Splay Nematic Liquid Crystal Display  

Kim, Tae-Hyung (School of Electrical Engineering, Pusan National University)
Lee, Joong-Ha (School of Electrical Engineering, Pusan National University)
Shen, Zheng-Guo (School of Electrical Engineering, Pusan National University)
Jang, Ji-Hyang (School of Electrical Engineering, Pusan National University)
Kim, Jeong-Soo (School of Electrical Engineering, Pusan National University)
Jhun, Chul-Gyu (School of Display Engineering, Hoseo University)
Kwon, Soon-Bum (School of Display Engineering, Hoseo University)
Yoon, Tae-Hoon (School of Electrical Engineering, Pusan National University)
Kim, Jae-Chang (School of Electrical Engineering, Pusan National University)
Publication Information
Korean Journal of Optics and Photonics / v.22, no.1, 2011 , pp. 23-29 More about this Journal
Abstract
Bistable chiral splay nematic liquid crystal display (BCSN LCD) is a memory type liquid crystal display using splay and $-\pi$ twist states as two stable states. When the cell thickness to pitch (d/p) ratio is 0.25, splay and $-\pi$ twist states have permanent memory time. However, when the transition from $-\pi$ 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 $-\pi$ twist state. In this paper, we propose a reflective BCSN LCD using $-\pi$ 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 $180^{\circ}$ in left- and right directions.
Keywords
Bistable; Reflective; Liquid crystal display;
Citations & Related Records
연도 인용수 순위
  • Reference
1 S. H. Lee, and K.-H. Park, T.-H. Yoon, and J. C. Kim, “Bistable chiral-splay nematic liquid crystal device using horizontal switching,” Appl. Phys. Lett. 82, 4215-4217 (2003).   DOI   ScienceOn
2 J.-X. Guo, Z.-G. Meng, M. Wong, and H.-S. Kwok, “Three-terminal bistable twisted nematic liquid crystal displays,” Appl. Phys. Lett. 77, 3716-3718 (2000).   DOI
3 C. D. Hoke and P. J. Bos, “Multidimensional alignment structure for the liquid crystal director field,” J. Appl. Phys. 88, 2302-2304 (2000).   DOI
4 C. G. Jhun, K. Chen, K. Kim, U.-S. Jung, J.-H. Moon, S.-B. Kwon, J. H. Lee, and J. C. Kim, “Gray scale of bistable chiral splay nematic device in the splay transition,” Mol. Cryst. Liq. Cryst. 527, 12/[168]~17/[173] (2010).   DOI
5 R. A. Soref and M. J. Rafuse, “Electrically controlled birefringence of thin nematic film,” J. Appl. Phys. 43, 2029-2037 (1972).   DOI
6 M. Oh-e and K. Kondo, “Electro-optic characteristics and switching behavior of the in-plane switching mode,” Appl. Phys. Lett. 67, 3895-3897 (1995).   DOI
7 S. H. Lee, S. L. Lee, and H. Y. Kim, “Electro-optic characteristics and switching principle of a nematic liquid crystal cell controlled by fringe-field switching,” Appl. Phys. Lett. 73, 2881-2883 (1998).   DOI
8 F. S.-Y. Yeung, H.-S. Kwok, “Fast-response no-bias-bend liquid crystal displays using nanostructured surfaces,” Appl. Phys. Lett. 88, 063505-1~063503-3 (2006).
9 D. W. Berreman and W. R. Heffener, “New bistable cholesteric liquid-crystal display,” Appl. Phys. Lett. 37, 109-111 (1980).   DOI
10 D. W. Berreman and W. R. Heffner, “New bistable liquidcrystal twist cell,” J. Appl. Phys. 52, 3032-3039 (1981).   DOI
11 A. J. Davidson, N. J. Mottram, “Flexoelectric switching in a bistable nematic device,” Physical Review E 65, 051710-1-051710-10 (2002).   DOI