Abstract: A capacitive touch panel includes first electrodes extending in first direction and second electrodes extending in a second (intersecting) direction. The first electrodes include parallel extending transmit first electrodes and receive first electrodes that are interleaved with each other. The second electrodes include parallel extending transmit second electrodes and receive second electrodes that are interleaved with each other. Transmit circuitry is coupled to the transmit first electrodes and transmit second electrodes. Receive circuitry coupled to the receive first electrodes and receive second electrodes. Processing circuitry controls activation of the transmit and receive circuitry in a manner which supports the making of adjacent line capacitance measurements and intersecting line capacitance measurements. The capacitance measurements are processed to identify and determine location of touches made on or near the capacitive touch panel.

Abstract: A serial resonant circuit, formed by EL panel (CEL) and coil (L1), is connected to a push-pull driver through a positive feedback path to form an oscillator circuit. The EL panel is driven by a sinusoidal driving signal to emit light. The voltage level of the EL panel driving signal is adjusted corresponding to the change in the capacitance of the EL panel so that the luminous brightness of the EL panel can be maintained on a constant level.

Abstract: A power terminal is connected to a DC power source. A differential amplifier has primary and secondary input terminals and an output terminal, and a device applies a reference voltage to the secondary input terminal of the differential amplifier. A phase inverter has an input terminal connected to the output terminal of the differential amplifier and has primary and secondary output terminals that output two output signals of opposite phase. A push-pull drive circuit has primary and secondary input terminals connected to the primary and secondary output terminals of the phase inverter, and has primary and secondary output terminals connected to a switching element that alternately turns on and off by being driven by the two output signals of opposite phase that are provided from the output terminals of the phase inverter.

Abstract: A direct current boost converter which has a simple structure using only one coil, and which can apply a driving voltage to a capacitive load which reciprocates in polarity is discussed. A first direct current branch circuit composed of first and second transistors is connected in parallel to a second direct current branch circuit composed of the third and fourth transistors. A coil is connected between the intermediate nodes of the transistors of these direct current branch circuits, and these nodes are further connected to both terminals of an EL panel through first and second diodes. The nodes between the first and second diodes and the EL panel are grounded through fifth and sixth transistors, respectively. A clock signal is applied to the first and third transistors, and a gate signal with an opposing phase is applied to the second and fourth transistors.