Abstract: In relation to an electric energy storage device or others, a configuration of efficient power feeding means to a control circuit is achieved. A storage device of a present embodiment includes a storage battery; an input/output terminal connectable to a power supply; a power converting device between the storage battery and the terminal; a control unit including a control circuit to controls charge/discharge of the storage battery; a first DC/DC converter connected to a first node between the storage battery and the power converting device and which outputs a first voltage; a second DC/DC converter connected to a second node inside the power converting device and which outputs a second voltage; a first diode connected between the first DC/DC converter and the control circuit; and a second diode connected between the second DC/DC converter and the control circuit. The first voltage and the second voltage are different from each other.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: In implementation of driving a liquid-crystal display device with a frame period T divided into a scanning period T1 and a hold period immediately following the scanning period, each data line in the liquid-crystal display device experiences a positive-polarity frame period and a negative-polarity frame period, which are repeated alternately. In addition, when a frame period T is stretched over positive-polarity and negative polarity data lines provided repeatedly on alternate columns of the liquid-crystal display device, an electric potential Vsigm appearing on a positive-polarity data line in a hold period is always higher than an electric potential Vcom appearing on an opposite electrode of each pixel in the liquid-crystal display device, but an electric potential Vsigm appearing on a negative-polarity data line in a hold period is always lower than the electric potential Vcom.