Abstract: The invention provides a liquid crystal device. The liquid crystal device includes a first transparent substrate and a second transparent substrate, wherein the first transparent substrate and the second transparent substrate are parallel to each other. Spacers are formed between the first transparent substrate and the second transparent substrate, to define a cavity; and a cholesteric liquid crystal is disposed into the cavity. Particularly, the liquid crystal device is coupled to a supply voltage, and three states of the liquid crystal device are selectively switched by adjusting the voltage, wherein the three states includes a first transparent state, a scattering state and a second transparent state.