| 摘要 |
PROBLEM TO BE SOLVED: To obtain a liquid crystal display device in which a driving voltage in renewing a picture is low and also in which a changing efficiency in performing the phase transition of the liquid crystal from a focal conic state to a planar state is satisfactory. SOLUTION: The liquid crystal display device performs display by holding chiral nematic liquid crystal whose anisotropy of dielectric constant is positive between a substrate 11 provided with electrodes 12a, 12b and a substrate 21 provided with an electrode 22 and by utilizing selected reflection of the liquid crystal. When a longitudinal electric field D2 being roughly vertical to surfaces of the substrates is generated among the electrodes 12a, 12b and the electrode 22, the liquid crystal becomes to be in a focal conic state in which its helical axis is vertical to the longitudinal electric field D2. At this time, when a transverse electric field D1 being roughly parallel with surfaces of the substrates is generated between the electrodes 12a, 12b, the liquid crystal becomes a planar state in which its helical axis is vertical to the transverse electric field D1. An alignment processing for making the helical axis coincide with the direction of the transverse electric field D1 is applied to an alignment control film in order to promote the change to the planar state. Moreover, in changing the liquid crystal to the planar state, a transverse electric field D1 having the intensity of the extent that it loosens the twist of the liquid crystal can be applied to the liquid crystal. COPYRIGHT: (C)2003,JPO |
