Liquid crystal device with two monostable liquid crystal cells

A liquid crystal device, comprising:

• a) two liquid crystal cells parallel to each other, each of which exhibits monostable molecular orientation of chiral smectic liquid crystal, wherein the directions of said monostable molecular orientation of each liquid crystal cell are substantially in one direction;
• b) each of said liquid crystal cells comprising:
• a plurality of thin film transistors having gates and sources, said thin film transistors being aligned on a plurality of scanning electrodes and signal electrodes,
• gate leads connected to the gates of the thin film transistors aligned on said scanning electrodes,
• source leads connected to the sources of the thin film transistors aligned on said signal electrodes,
• a first substrate having drain electrodes connected to said thin film transistors,
• a second substrate having a transparent electrode counter to said drain electrodes;
• c) a polarizer and an analyzer, wherein the optical axis of said polarizer is substantially parallel to the optical axis of said liquid crystal in said monostable molecular orientation and the optical axis of said analyzer is substantially perpendicular to the optical axis of said polarizer;
• d) a voltage applying means which applies a gate-on-pulse to said gate leads provided in both of said cells;
• e) a voltage applying means which applies rectangular signal voltages synchronized with said gate-on-pulse for source leads of said two liquid crystal cells,
• wherein (i) optical axes of said two liquid crystal cells are both in said monostable molecular orientation to obtain one transmission state, (ii) optical axes of only one of said two liquid crystal cells are in said monostable molecular orientation to obtain another transmission state, and (iii) phases of the rectangular signal voltages applied to said two liquid crystal cells to obtain said another transmission state are inverse to each other.