US 6,982,691 B2
Method of driving cholesteric liquid crystal display panel for accurate gray-scale display
Nam-Seok Lee, Suwon (Korea, Republic of); Woon-Seop Choi, Seoul (Korea, Republic of); Hee-Jung Lee, Seongnam (Korea, Republic of); Min-Kyu Kim, Pohang (Korea, Republic of); and Hyun-Soo Shin, Seoul (Korea, Republic of)
Assigned to Samsung SDI, Co., Ltd., Suwon-si (Korea, Republic of)
Filed on Sep. 20, 2002, as Appl. No. 10/247,551.
Claims priority of application No. 2001-85908 (KR), filed on Dec. 27, 2001.
Prior Publication US 2003/0122758 A1, Jul. 03, 2003
Int. Cl. G09G 3/28 (2006.01); G09G 3/36 (2006.01); G02F 1/133 (2006.01)
U.S. Cl. 345—89 20 Claims
OG exemplary drawing
 
16. A method of driving a cholesteric liquid crystal display panel, the method comprising the steps of:
during a selection time, applying at least one selection line voltage to a particular scan electrode line of the panel and substantially simultaneously applying data signals to all data electrode lines in order to select a state of cholesteric liquid crystal cells of the panel in dependence upon a predetermined gray scale level;
during the selection time, maintaining a homeotropic state in the cholesteric liquid crystal cells having a highest gray scale level; and
during the selection time, relaxing the state of the cholesteric liquid crystal cells having a lowest gray scale level into a transient-planar state.