Thomson-csf

Francoise Vialettes

Louis Delgrange

Jacques Deschamps

Michel Specty

Gerard Le Roux

A control circuit is provided for an alternating type plasma display panel, comprising integrated circuits which are used for the first and second electrode arrays of the panel. In the first array, the integrated circuits participate in producing selective signals and transmit the reference voltage of the sustaining signals. In the second array, the integrated circuits participate in producing selective signals, and transmit the square wave voltage of the sustaining signals and their reference voltage is floating, that is to say that it follows the sustaining signals and, during production of the selective signals, it follows the lowest potential that is possible to apply to the electrodes. The integrated circuits are provided with logic circuits which receive a signal indicating whether the integrated circuit is used with the first or with the second electrode arrays, so that in the case of use with the first array the active electrodes are brought to the high level with respect to the non active electrode and in the case of use with the second array the non active electrodes are brought to the high level with respect to the active electrodes.

Control circuit for an alternating type plasma display panel

The present invention relates to a conversion circuit having a differential input in CMOS logic levels, this circuit comprising an input comparator comprising two NPN type bipolar transistors, connected by their emitters and receiving differential input signals on their bases; a CMOS flip-flop comprising two branches each constituted by a P-channel MOS transistor in series, with two N-channel MOS transistors of each branch being connected in order to set the current of these branches at the passing state, the gates of the first N-channel MOS transistors of each branch being connected to the drains of the P-channel transistors of the other branch and to an output terminal. This circuit can be used in plasma panel command operations.

Conversion circuit of a differential input in CMOS logic levels

In an alternate type plasma panel, the low voltage/high voltage interface circuits of the integrated circuits associated to the second network of electrodes are supplied in high voltage by the two amplifiers associated to each of these integrated circuits. During elaboration of the writing and erasure signals, one of the amplifiers supplies the voltage to be applied to the selected electrodes, to write or to erase, while the other amplifier supplies the voltage to be applied to the non selected electrodes.

Control circuit for an alternate type plasma panel

According to the present invention, an alternating current plasma panel is controlled in the following way, when it is wished to replace one information by another:

Process for the control of an alternating current plasma panel and

This invention concerns an AC plasma display panel control circuit, comprising integrated circuits combined with a single amplifier to control one of the electrode networks, and integrated circuits combined with two amplifiers to control the other electrode network. The integrated circuits issue setting and erasure signals, and the amplifiers issue maintenance signals.

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St. Egreve, France

Francoise Vialettes