Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Tooru Suyama

Tomokazu Kojima

Tsutomu Sakakibara

Hiroshi Kojima

Yoshito Date

Yasuyuki Doi

Masaaki Nishihara

Takahito Kushima

Tetsuro Ohmori

Junji Takiguchi

Kazuhiko Nagaoka

Yoshiyuki Otani

Miki Fujino

Tsukasa Kawahara

Tomoya Ishikawa

Shinji Miyamoto

Yoshiyuki Konishi

Kazuhito Ito

Masahiro Akabori

Kenji Miyake

A driving circuit for a display device for selectively outputting a driving voltage positive or negative with respect to a given reference voltage of the display device in accordance with an image signal, includes an input stage circuit; and an output stage circuit for outputting a driving voltage between a given high voltage and a first intermediate voltage or a driving voltage between a second intermediate voltage and a given low voltage in accordance with a pair of output stage control signals output from the input stage circuit.

Display device and driving circuit for display device

A display apparatus driving circuit capable of reducing the amount of heat generated at a driving unit while suppressing degradation in image quality is provided. A display apparatus driving circuit according to the present invention includes: a source driver for driving a display unit; a heat detecting circuit for detecting amount of heat generated at the source driver, and outputting a heat detection signal when the detected amount of generated heat is equal to or larger than a predetermined reference value; and a heat reduction circuit for changing, when the heat detection signal is received, a driving method of the display unit to reduce the amount of heat generated at said source driver.

Method and apparatus for reducing heat generated at source driver of display apparatus

A liquid crystal display device according to the present invention includes: a liquid crystal panel; a source driverfor controlling the gray-scale level by applying a voltage to the liquid crystal panel; a DC-DC power supplyfor driving the source driverby supplying current to the source driver; a controllerfor supplying a signal for controlling the gray-scale level to the source driver; and a variation calculatorfor calculating the amount of change in the signal from the controller. In the DC-DC power supply, current to be supplied to the source driverchanges in accordance with the amount of change in the signal calculated by the variation calculator

Liquid crystal display device, power supply circuit, and method for controlling liquid crystal display device

A compact-size driving voltage controller is provided which can be driven with low power. The compact-size driving voltage controller which can be driven with low power includes a High output operational amplifier and a Low output operational amplifier for supplying driving voltages VcomH, VcomL to a load such as a liquid crystal display panel, an output switch for alternating between the outputs of the operational amplifiers, a Low voltage setting operational amplifier for generating a set voltage to be supplied to the non-inverted input terminal of the Low output operational amplifier, a set voltage generator including a current mirror circuit and a clamping circuit, a bias current controller for controlling the bias current flowing in each operational amplifier with a predetermined timing, and a timing controller for controlling the changeover timing of the output switch.

Driving voltage controller

Growing community of inventors

Kyoto, Japan

Tooru Suyama