Kabushiki Kaisha Toshiba

Rieko Iida

Tatsuo Saishu

Hisao Fujiwara

Haruhiko Okumura

Rei Hasegawa

Masahiko Akiyama

Yujiro Hara

Kohki Takatoh

Hiroyuki Nagata

Goh Itoh

Akira Kinno

Kouhei Suzuki

A liquid crystal display device is an active matrix type liquid crystal display device using a liquid crystal material having spontaneous polarization induced by application of an electric field or inherent thereto and includes a driving circuit for simultaneously selecting and driving a desired number of scanning lines among a plurality of scanning lines and a voltage applying circuit for applying a desired voltage for alignment of the liquid crystal material to a common electrode.

Liquid crystal display device

In a method for driving a liquid crystal display apparatus which includes liquid crystal having spontaneous polarization disposed between a plurality of pixel electrodes arranged in a matrix form and a common electrode disposed to face the pixel electrodes, the method for driving the liquid crystal display apparatus includes a polarity inversion of periodically inverting polarities of at least one part of voltages applied between the plurality of pixel electrodes and the common electrode, and a write-in operation of applying the voltages to the pixel electrodes to hold display voltages, respectively, corresponding to the applied voltages on the pixel electrode, wherein the polarity inversion is effected to satisfy the expression of TS/TF&gE;2 when a frame period is set to TF and a period for effecting the polarity inversion is set to TS.

Liquid crystal display apparatus and method for driving the same

A pixel electrode is connected to a signal line via an n-channel TFT element for writing image signals and the pixel electrode is connected to an auxiliary storage capacitance line via p-channel TFT element for resetting the pixel electrode, wherein gate electrodes of the n-channel and p-channel TFT elements provided in a pixel region are commonly connected to a corresponding scanning line of the pixel region or to the corresponding scanning line and an adjacent scanning line, respectively.

Active matrix type liquid crystal display

An active matrix type liquid crystal display device comprises a liquid crystal layer using liquid crystal of a chiral smectic C phase or its sub-phase as a liquid crystal material, pixel electrodes provided on one side of the liquid crystal layer, a common electrode provided on the other side of the liquid crystal layer, switching elements for supplying a predetermined electric potential to the pixel electrodes, and at least two insulation layers, which are provided between the pixel electrode and the liquid crystal layer and between the common electrode and the liquid crystal layer and which include at least alignment films, a sum of values (d/.epsilon.) obtained by dividing a thickness d �nm! of each insulation layer by a relative dielectric constant .epsilon. thereof at a frequency 1 kHz is set to be between 15 nm and 40 nm.

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Yokohama, Japan

Rieko Iida