Matsushita Electric Industrial Co., Ltd.

Hiroyuki Irie

Susumu Ide

Masanori Watanabe

Kinzo Nonomura

Tamotsu Matsuo

Yoshinobu Takesako

Tadao Kohashi

Hiroshi Esaki

Norio Meki

Seiji Fijisawa

A picture image display apparatus has a flat type vacuum enclosure having a transparent face panel. A row of parallelly disposed linear thermionic cathodes are provided with an electron beam extractor electrode which produces a predetermined number of two dimensionally disposed electron beams out of the electron emission from the linear thermionic cathodes. A row of control electrodes is disposed parallelly in a direction perpendicular to those of the linear thermionic cathodes. A row of vertical deflection electrodes and a row of horizontal deflection electrodes are provided. A phosphor screen formed on the inner force of the face panel has an anode of thin metal film formed on its surface. A horizontal deflection signal generator issues a horizontal deflection signal having, in 1 cycle, a first scanning period wherein voltage increases and a second scanning period of the same length wherein voltage decreases. In both of the first and second scanning periods control signals are applied to the control electrodes to produce image spots in both scanning periods.

Picture image display apparatus

An electroosmotic ink printer comprising a head having an array of recording electrodes successively arranged to define a print line along one edge of the head. A common electrode is provided in spaced overlying relation with the recording electrodes. Between the electrode array and the common electrode is a means for electroosmotically moving ink in a direction toward the print line and in an opposite direction depending on an electrical potential applied to the recording electrodes with respect to the common electrode. A memory stores a video input signal in a plurality of storage locations corresponding to the recording electrodes for delivery in parallel form to a modulator for generating individual recording signals corresponding to the recording electrodes. Control means activates first and second groups of the recording electrodes by successively applying the individual recording signals thereto to cause the ink to move to the print line and deactivates the remainder of the recording electrodes by successively applying a deactivating potential to the electrodes of the group other than those to which the recording signals are applied.

Electroosmotic ink printer

The picture image display apparatus in accordance with the present invention comprises:

A drive circuit drives a liquid crystal display device of the type in which liquid crystal fills a space between an X-Y matrix substrate having a number of picture elements each including a switching element, and a common electrode plate. The drive circuit provides an optimum picture displayed to an observer in accordance with ambient conditions such as light and temperature. To this end, a DC bias voltage to determine the operating point of the liquid crystal display device is applied to the common electrode. The brightness of the displayed picture may be controlled by adjusting the DC bias voltage. The DC bias is changed in accordance with a change in an amount of ambient light or ambient temperature. Furthermore, in accordance with the fall of the ambient temperature the DC voltage applied to the common electrode is made to oscillate at a frequency to which the liquid crystal is insensitive, with respect to the bias point. At this time, the amplitude of the oscillation is made large.

Brightness adjusting circuit of liquid crystal matrix panel for picture

The present invention relates to a driving method for displaying television signals on an X-Y matrix type liquid crystal display panel having both switching elements and memory elements for respective picture elements which utilizes the phenomenon that high frequencies reduce the erasing time of the liquid crystals. According to the present invention, when a panel is driven by means of a line at a time process, each horizontal scanning period is divided into two periods, a video signal period and a erasing signal period, thereby to provide a composite signal having a video signal portion and an erasing signal portion so that a first pulse corresponding to the video signal period writes the video signal on that panel and a plurality of second pulses corresponding to the erasing signal period applies the erasing signal to the panel for erasing.

Method for driving an X-Y matrix type liquid crystal display panel

A television receiver having a picture control circuit permitting simultaneous control of both brightness and contrast and means for controlling contrast alone without varying brightness so that the character of the reproduced picture may be controlled to suit a viewer's taste.

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Osaka, Japan

Hiroyuki Irie