Abstract: The invention relates to image display screens using a cell matrix to form an image. More particularly, the invention relates to means for facilitating relative positioning of various elements during manufacturing. The inventive screen consists of at least two electrode networks. One of the characteristics of the invention is that at least one of said networks consists of “variable direction” electrodes which are shaped in such a way that they spread out and then return towards their longitudinal axis to intersect and pass alternatively from one side to the other of said axis. The spread of a variable direction electrode in relation to the longitudinal axis has an amplitude depending on the position of the electrode in respect to a reference position. This arrangement provides appropriate dimensional leeway to facilitate superpositioning of several masks of varying dimensions. The invention is used in “flat screens”, specially plasma panels.

Abstract: The device comprising a video processing circuit (7) for processing the video data received, a correspondence memory (8) for transcoding these data, a video memory (9) for storing the transcoded data, the video memory being linked to column drivers (10) in order to control the column addressing of the plasma panel on the basis of column control words, a control circuit (11) for the line drivers (12), is characterized in that the control circuit for the line drivers simultaneously selects at least two successive lines during the transmission by the column drivers (10) of at least one of the bits of the column control words relating to one of these lines.

Abstract: A color two substrate alternating plasma display panel. The panel includes two tiles joined together so as to be opposite each other and defining a space therebetween. The space is filled with gas. One of the tiles has column electrodes which are approximately parallel, separated by a spacing and covered with at least one phosphor region. The other tile has at least one row electrode. The phosphor regions are provided with at least one recess placed at the intersection of a column electrode with the row electrode. A color pixel is formed by neighboring recesses lying within the same row electrode in adjacent phosphor regions. In order to obtain better light efficiency, the distance separating two adjacent recesses lying within adjacent phosphor regions and belonging to the same pixel is greater than the spacing so that space has a thickness greater than that required when two recesses are separated by approximately the spacing.

Abstract: Disclosed is a method for the control of display screens that can be applied to internal memory type screens, notably plasma display panels for which it increases the dynamic range of the adjusting of the luminosity. This method consists in controlling the cells (C1 to C16) of the screen by means of addressing commands, each one of which comprises a selective command and a semi-selective command. According to one characteristic, for the addressing of one and the same line (L1 to L4) of cells (C1 to C16), the method consists in separating the selective command (CI) from the semi-selective command (CE) by an adjustable interval of time (PL1 to PL4).

Abstract: Disclosed is a plasma panel wherein the row electrodes and/or column electrodes are arranged to enable, notably, a selective type of addressing of several rows of pixels simultaneously. This is obtained, firstly, by a demultiplication of the row electrodes and by an increase in the number of column electrodes, the result thereof being a greater number of crossings between column and row electrodes and, secondly, by an increase in the surface of the crossings designed to form pixels, and by a limiting of the voltages applied to the electrodes.

Abstract: Disclosed is a method for the row-by-row control of the pixels of a plasma panel. This method is applicable in the case where a pixel is defined at the intersection of a column electrode with a pair of sustaining electrodes. The method disclosed makes it possible to obtain, notably, a reduced cycle time with a small number of voltage levels applied to the different electrodes. To this effect, according to one characteristic of the invention, the method consists in the erasure of the pixels of a row solely by erasing discharges generated between the electrodes of the corresponding electrode pair.

Abstract: A coplanar sustaining plasma panel, and particularly an electrode arrangement make is possible to better contain the sustaining discharges in a predetermined zone. Plasma panel (10) of the invention comprises addressing electrodes (X1 to X3) crossed with sustaining electrodes arranged by pair (p1, p2), each sustaining electrode pair being formed of an addressing-sustaining electrode (Y1, Y2) and a sustaining-only electrode (E1, E2). A pixel (PX1 to PX6) consists approximately at each crossing of an addressing electrode (X1, X2, X3) with a sustaining electrode pair (p1, p2). At least one of two electrodes (Y1, E1) of same pair (p1) comprises, at the level of each pixel (PX1 to PX6), a projecting surface (SB1 to SB3, SC1, SC3) oriented toward the other electrode.

Abstract: A method of adjusting the colors of a polychrome plasma panel is provided, including a plurality of elementary image points, each point being formed by several zones covered with luminophores of different colors, each of these zones corresponding to the intersection of electrodes for applying control signals and more particularly a holding signal to each zone during operation, which method consists in applying to the different zones of each elementary image point a respective holding signal at an adjustable frequency, identical for all the luminophores of the same type of all the image points of the panel, and the colors of the panel are adjusted by adjusting the frequency of the different holding signals used.

Abstract: Disclosed is a method for the control of the pixels of a plasma panel by selective addressing and semi-selective addressing. The disclosed method can be applied to cases where a pixel is defined at the intersection of a column electrode with a pair of sustaining electrodes. The disclosed method can be used, notably, to obtain a reduced picture cycle time. To this effect, according to one characteristic of the disclosed method, certain pixels are controlled simultaneously by semi-selective addressing while other pixels are controlled by selective addressing.

Abstract: Peripheral electrodes formed at the same time as the electrode arrays of a display panel and surrounding each array are cut into at least two segments. Two cut electrodes can thus be repaired together with each peripheral electrode by applying conductive deposits which serve to join the ends of each cut electrode to a peripheral electrode segment.

Abstract: 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.

Abstract: The invention relates to storage tubes having a dielectric target in which the writing is effected by a beam of slow electrons supplying the target with negative charges in an amount which is a function of the data to be written. The new method mainly consists in: causing each writing of a zone of the target to be followed by a sweeping of said zone with rapid electrons supplying at each written point a small quantity of positive restoring charges, whereby it is possible to reach an equilibrium potential within a finite and regulatable time while avoiding the phenomenon of integration.