Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Munehiko Ogawa

Hiroshi Kojima

Kazuyoshi Nishi

Tomokazu Kojima

Yasuhiro Hirokane

A display driving device is provided which drives a display panel having source lines provided for columns of pixels and which includes: first switches swprovided for the source lines; second switches swprovided for the source lines; AMP unitswhich are provided for the source lines and drive a pixel signal to the source lines via the second switches; an external power sourceapplying an intermediate voltage of the pixel signal to an intermediate voltage line, the intermediate voltage having a level between a minimum voltage level and a maximum voltage level of the pixel signal; and a control circuitcontrolling turning on and off the first switches and the second switches, wherein the control unit temporarily turns off at least part of the second switches, and concurrently, temporarily turns on corresponding ones of the first switches during a transition period of the pixel signal.

Display driving device and display apparatus

In an offset fixing operational amplifier circuit, an operational amplifier circuit includes an input stage containing a first constant current source, a second constant current source, a first differential pair and a second differential pair. A bias circuit supplies a bias voltage to the operational amplifier circuit. An offset fixing circuit controls the input stage in accordance with an input voltage of the operational amplifier circuit.

Offset fixing operational amplifier circuit

In a bias voltage generating circuit for outputting through switching over a plurality of bias voltages and standby voltages provided for the respective bias voltages, a voltage return unit is provided for each bias voltage, and charges stored in the voltage return unit are supplied before power ON starts so that the bias voltage is approximated to a predetermined voltage. A drive controller drives the voltage return unit and a standby voltage generator, and a period of driving control is arbitrarily set by a register.

Growing community of inventors

Osaka, Japan

Munehiko Ogawa