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Liquid crystal display device and method for driving the same
| Details |
Inventors: Numao, Takaji; Tagawa, Akira; Tamai, Kazuhiko; Koden, Mitsuhiro; Shinomiya, Tokihiko;
Assignee: Sharp Kabushiki Kaisha (Osaka, JP)
Primary Examiner: Sikes; William L.
Assistant Examiner: Duong; Tai V.
Attorney, Agent or Firm: Conlin; David G., Oliver; Milton
A ferroelectric liquid crystal display device includes a plurality of pixels, and each of the plurality of pixels includes ferroelectric liquid crystal material having ferroelectric liquid crystal molecules therein capable of being aligned in a first stable alignment state, whereby a principal axis of each of the molecules is aligned at an angle .omega. with respect to a central line, and of being aligned in a second stable alignment state, whereby the principal axis of each of the molecules is aligned at an angle -.omega. with respect to the central line, and a pair of polarizers on opposite sides of the ferroelectric liquid crystal material, a polarizing axis of one of the polarizers being substantially aligned with the central line. |
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DETAILED DESCRIPTION One aspect of the present invention relates to a ferroelectric liquid crystal display device comprising a plurality of pixels, each including ferroelectric liquid crystal material having ferroelectric liquid crystal molecules therein capable of being aligned in a first stable alignment state, whereby a principal axis of each of the molecules is aligned at an angle .
omega.
with respect to a central line, and of being aligned in a second stable alignment state, whereby the principal axis of each of the molecules is aligned at an angle -.
omega.
with respect to the central line; and a pair of polarizers on opposite sides of the ferroelectric liquid crystal material, a polarizing axis of one of the polarizers being substantially aligned with the central line.
In one embodiment of the invention, the ferroelectric liquid crystal molecules in one of the two stable alignment states is put at a position between the central line and a tilting axis by application of a voltage in the range between a prescribed positive voltage and a prescribed negative voltage, and the ferroelectric liquid crystal molecules in the other stable alignment state is put at a position between the central line and another tilting axis by application of a voltage in the range between a prescribed negative voltage and a prescribed positive voltage.
In one embodiment of the invention, the plurality of pixels are arranged in a matrix, and each of the plurality of pixels is connected to a driving circuit including a first switching device for controlling an output of a driving signal; a charge retaining capacitance for receiving an output from the first switching device; and a second switching device for receiving the output received by the charge retaining capacitance from the first switching device as a switching control signal for controlling an output of a charge for display sent from a display power source and for sending the charge for display to establish an arbitrary field across the ferroelectric liquid crystal molecules in the corresponding pixel
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