Hitachi, Ltd.

Shouichi Hirota

Shinichi Komura

Ikuo Hiyama

Makoto Tsumura

Yoshifumi Sekiguchi

Susumu Edo

Takayuki Oouchi

A method of driving an active-matrix liquid-crystal display device includes a frame period of a picture displayed on a liquid-crystal panel divided into a scanning period and a hold period longer than the scanning period. In the scanning period, image data of an amount corresponding to a frame is written into the liquid-crystal panel. In the hold period following the scanning period, an off state is sustained. Each data line repeatedly experiences a positive-polarity frame period and a negative-polarity frame period, which are arranged alternately along the time axis. In a frame period, an electric potential appearing on a positive-polarity data line in the hold period is increased to a level higher than an electric potential appearing on an opposite electrode. The positive-polarity data line is defined as the data line, on which an electric potential appears at a level higher than an electric potential appearing on the opposite electrode.

Liquid-crystal display device and method of driving liquid-crystal display device

A display unit has a brightness equal to that in a conventional black-and-white reflection type and the power consumption is small at a standby time, and bright color display of high quality can be produced and power consumption is small at the time of use. An information device having this display unit, such as a portable phone, also is provided. The display unit has a color light emitting means, a reflecting mean of external light and a light polarizing state modulating means. The display unit has a driving method switching means for switching color light emitting display and reflection display by on/off control of the light emitting means and switching control of a driving method of a display element.

Color/black-and-white switchable portable terminal and display unit

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Hitachi, Japan

Shouichi Hirota