Patent ID: 7265810
Filing Date: 2007-09-04
Classification: C09K

Abstract:
1. A liquid crystal display device comprising two substrates sandwiching a liquid crystal having spontaneous polarization, and electrodes for applying a voltage to said liquid crystal, wherein said liquid crystal shows a monostable state in which an average molecular axis of a director of liquid crystal molecules is aligned in a single direction and present in a first position when no voltage is applied, shows a state in which the average molecular axis is tilted in one direction from the first position at an angle corresponding to a magnitude of a voltage of a first polarity and present in a second position when the voltage of the first polarity is applied, and shows either a state in which the average molecular axis maintains the first position or a state in which the average molecular axis is tilted in a direction opposite to said one direction from the first position and present in a third position when a voltage of a second polarity opposite to the voltage of the first polarity is applied, and a temperature range of either one of a cholesteric phase and a chiral nematic phase of a phase sequence of said liquid crystal, the phase sequence being either one of an isotropic phase—cholesteric phase—chiral smectic C phase and an isotropic phase—chiral nematic phase—chiral smectic C phase from a higher-temperature side, has a temperature width ranging between 3° C. and 24° C.