Patent ID: 7612835

Claim:
A bistable liquid crystal display, comprising: two opposing upper and lower substrates; two transparent electrode layers disposed respectively on the upper and lower substrates and between the upper and lower substrates; two alignment layers disposed respectively on the two transparent electrode layers; a signal source for generating a first driving signal and a second driving signal, the first driving signal having a first frequency and the second driving signal having a second frequency; and a liquid crystal layer disposed between the two alignment layers, the liquid crystal layer having a plurality of dual frequency liquid crystal molecules and a dichromatic dye, the liquid crystal layer having a stable tilted homeotropic state and a stable twisted state in such a manner when the first driving signal of the first frequency is applied to the liquid crystal layer for a first predetermined period of time and then the application of the first driving signal to the liquid crystal layer stops, the liquid crystal layer will switch to the tilted homeotropic state, the second driving signal of the second frequency is applied subsequently to the liquid crystal layer for a second predetermined period of time and then the application of the second driving signal to the liquid crystal layer stops, the liquid crystal layer will switch to the twisted state.