Fujitsu Corporation

Hitachi, Ltd.

Hitachi Plasma Patent Licensing Co., Ltd.

Shinpei Yao

Naoki Matsui

Shigetoshi Tomio

Tomokatsu Kishi

Tetsuya Sakamoto

Shigeki Kameyama

A flat display employs at least one high voltage different from logic voltages. The display has a voltage detection unit and a drive control signal control unit. The voltage detection unit is used to detect the high voltage. The drive control signal control unit is used to control drive control signals of the flat display in accordance with the detected high voltage. This arrangement eliminates charging currents that are applied to a display panel but have nothing to do on the actual displaying of data, or reactive currents due to unnecessary switching operations, thereby reducing power consumption.

Flat display panel having internal power supply circuit for reducing power consumption

A flat display employs a high voltage different from logic voltages and has a voltage detection unit and a drive control signal control unit. The voltage detection unit detects the high voltage and the drive control signal control unit controls drive control signals of the flat display in accordance with the detected high voltage. This arrangement eliminates charging currents which normally are applied to a display panel but are unrelated to the actual displaying of data and also reactive currents caused by unnecessary switching operations, thereby reducing power consumption.

A power supply which inputs a first direct-current voltage from the outside and outputs a high direct-current voltage to a plasma display panel. The power supply connects the input direct-current voltage to a positive polarity side of a first capacitor of a plurality of N capacitors connected in series to each other and connects a negative polarity side of the first capacitor to a ground (step 1); connects the input direct-current voltage to a positive polarity side of an Mth capacitor of the N capacitors and connects a negative polarity side of the Mth capacitor to the ground (step 2); repeats step 2 for M=2 to N (step 3); and outputs a voltage of the positive polarity side of the first capacitor to the plasma display panel (step 4).

Growing community of inventors

Kawasaki, Japan

Shinpei Yao