Fujitsu Hitachi Plasma Display Limited

Hitachi, Ltd.

Tomoya Matsui

Tomokatsu Kishi

Shigetoshi Tomio

Akihiro Takagi

Tetsuya Sakamoto

A method for driving a plasma display device, wherein a plurality of sub-frames is classified into first-type and second-type sub-frames. In each reset period of the first-type sub-frames, a gradient voltage pulse having an reverse polarity to that of a final gradient voltage pulse is applied between first and second electrodes prior to the final gradient voltage pulse, while in each reset period of the second-type sub-frames, the gradient voltage having the reverse polarity to that of the final gradient voltage pulse is not applied between the first and second electrodes. There is a plurality of first-type sub-frames in one frame, and the attained voltage of a gradient voltage pulse of reverse polarity included in at least one first-type sub-frame among the plurality of first-type sub-frames differs from that of the gradient voltage pulse of reverse polarity in other first-type sub-frame.

Driving method of plasma display device

An air purifier includes a main body defining an air passage therein to allow sucked air to pass therethrough prior to being discharged, and a first filter installed in the main body to be switched between a closed state and an open state. The first filter removes contaminants from the sucked air in the closed state, and allows the sucked air to pass through the air passage in the open state. The air purifier may include a main body to suck and discharge air, with a bypass passage formed in the main body so that the bypass passage is opened or closed by a door, and a first filter installed in the main body. The sucked air passes through the first filter prior to being discharged when the door is closed, and passes through the bypass passage prior to being discharged when the door is opened.

Drive circuit of plasma display device

A plurality of sub-frames is classified into first-type and second-type sub-frames. In each reset period of the first-type sub-frames, a gradient voltage pulse having an reverse polarity to that of a final gradient voltage pulse is applied between first and second electrodes prior to the final gradient voltage pulse, while in each reset period of the second-type sub-frames, the gradient voltage having the reverse polarity to that of the final gradient voltage pulse is not applied between the first and second electrodes. There is a plurality of first-type sub-frames in one frame, and the attained voltage of a gradient voltage pulse of reverse polarity included in at least one first-type sub-frame among the plurality of first-type sub-frames differs from that of the gradient voltage pulse of reverse polarity in other first-type sub-frame.

Growing community of inventors

Kawasaki, Japan

Tomoya Matsui