Matsushita Electric Industrial Co., Ltd.

Yasuaki Muto

Akio Takimoto

Hiroshi Miyai

Yasunori Kuratomi

Koji Akiyama

Tomoko Morita

Naoki Kosugi

Hiroshi Tsutsui

Hiroyuki Tachibana

Toshikazu Wakabayashi

Yuji Sekiguchi

Toshikatsu Kawakami

Akio Niwa

Toshikazu Kawakami

Toshio Wakahara

Takuma Higashi

Hiroshi Noguchi

The initializing period of at least one of a plurality of sub-fields constituting one field is a selective initializing period for selectively initializing discharge cells in which a sustain discharge has occurred in the sustaining period of the preceding sub-field. In the sustaining period of the sub-field prior to the sub-field including the selective initializing period, voltage Vr is applied to a priming electrode (PRi) for causing a discharge between the priming electrode (PRi) and corresponding scan electrode (SCi) using the priming electrode (PRi) as a cathode.

Plasma display panel drive method

Video data of a field necessary for I/P conversion and scanning line conversion is stored in a field memory part (), vertical frequency conversion is performed by a memory control processing part (), I/P conversion is performed by an I/P conversion processing part (), scanning line conversion is performed by a scanning line conversion part () and horizontal pixel conversion is performed by a horizontal pixel conversion processing part () with the data stored in the field memory part, and a synchronous processing part () supplies a prescribed clock, a horizontal synchronizing signal and a vertical synchronizing signal to each block. A single system performs vertical frequency conversion, I/P conversion, scanning line conversion and horizontal pixel conversion.

Video signal conversion device and video signal conversion method

Projection type image displaying apparatus

In a projection type video display device comprising a light writing type spacial light modulator, disturbances brought about by a resetting pulse and appearing in a projected picture as a black belt or beat are prevented. This is accomplished by causing the resetting pulse, which is to withdraw electric charges produced by incoming writing light and accumulated in spacial light modulator, to occur within a vertical blanking period synchronized with vertical synchronization signal. Further, by changing the pulse width and the voltage of the resetting pulse in accordance with vertical synchronization frequency, pictures of a certain fixed brightness are made available against various vertical synchronization frequencies; and even with a high vertical synchronization frequency, projected pictures are never annoyed by such disturbance that is caused by a resetting pulse dislocated out of the vertical blanking period. Further, by controlling the adjustments of the writing voltage to be applied to the spacial light modulator during the writing period and the resetting voltage to be applied to the spacial light modulator during the resetting period, the spread in characteristics of the spacial light modulator is compensated to provide a certain fixed contrast and .gamma. characteristic. Furthermore, in a video display device for full-color display, writing voltage and resetting voltage can be established independently corresponding to the respective three RGB primary colors, video outputs of any desired color temperature are obtainable by adjusting the balance of light emission among the three RGB colors.

Video display device

Growing community of inventors

Osaka, Japan

Yasuaki Muto