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US 7,612,835 B2Granted
Bistable liquid crystal displays and the method for driving the same
AssigneeWintek Corporation
InventorsJy Shan Hsu, Bau Jy Linag, Shu Hsia Chen, Ping Wen Huang
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Abstract
A bistable chiral tilted-homeotropic nematic liquid crystal (BCTHN) display can be switched between the tilted-homeotropic state (TH state) and the twisted state (T state) by using dual frequency liquid crystal material. These two states can be maintained without the application of any electric field. The bistable liquid crystal display does not need high voltage to induce the flow of liquid crystal or break the anchoring energy.
Claims10
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.
3 more elements
Dependencies are inferred from the claim text.