Abstract: An object of the present invention to accurately and reliably detect rotational positions of a rotor irrespective of noise overlapping inductor voltage. Employed for accomplishing the aforementioned object in the present invention is a motor-driving device for rotating and driving a rotor by supplying predetermined drive signals to stator coils each corresponding to each phase of a DC brushless motor, the device comprising: a drive-signal-generating unit for generating the drive signals by switching direct current power based on a pulse-control signal; and a control-signal-generator unit for generating the pulse-control signal that controls the drive-signal-generating unit by intermittently generating the pulse-control signal; and for detecting the rotational position and the rotational velocity of the rotor based on inductor voltage obtained from the stator coils in a period in which generation of the pulse-control signal is suspended in each phase.

Abstract: An object of the present invention to accurately and reliably detect rotational positions of a rotor irrespective of noise overlapping inductor voltage. Employed for accomplishing the aforementioned object in the present invention is a motor-driving device for rotating and driving a rotor by supplying predetermined drive signals to stator coils each corresponding to each phase of a DC brushless motor, the device comprising: a drive-signal-generating unit for generating the drive signals by switching direct current power based on a pulse-control signal; and a control-signal-generator unit for generating the pulse-control signal that controls the drive-signal-generating unit by intermittently generating the pulse-control signal; and for detecting the rotational position and the rotational velocity of the rotor based on inductor voltage obtained from the stator coils in a period in which generation of the pulse-control signal is suspended in each phase.

Abstract: An A/D converter is provided for converting input video signal to a tone control unit is provided to produce a control signal a value of which increases non-linearly with respect to an input value. A modulator is provided for generating a driving signal for driving a display panel. The driving signal is modulated in dependence on the tone data and the control signal.

Abstract: A display apparatus has a display panel, which is provided with a plurality of scanning electrodes and a plurality of signal electrodes arranged in a matrix shape, and a plurality of EL elements connected to the scanning electrodes and the signal electrodes at intersections thereof. A driving circuit for the display apparatus is provided with: a driving device for supplying a constant current driving signal to the signal electrodes in correspondence with an input signal, to drive the display panel; a detection device for detecting a voltage drop in a forward direction of the EL element, and outputting a detection signal which indicates the detected voltage drop; and a control device for controlling voltage, which is supplied to the driving device, to have a predetermined voltage value in correspondence with the detection signal from the detection device.