Thomson-Csf

Thomson Tubes Electroniques

Michel Gay

Jacques Deschamps

Serge Salavin

Michel Specty

Louis Delgrange

Bruno Rimaud

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).

Method for adjusting the luminosity of display screens

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.

Plasma panel with increased addressability

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.

Method for the row-by-row control of a coplanar sustaining AC type of

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. According to a characteristic of the invention, projecting surfaces (SB1 to SB3, SC1 to SC3) are arranged so that between two consecutive pixels (PX1 to PX6) of same pair (p1, p2), of the two closest projecting surfaces, one belongs to an addressing-sustaining electrode (Y1, Y2) and the other to a sustaining-only electrode (E1, E2).

Plasma panels in delimited discharge zones

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.

Method of adjusting the colors of a polychrome plasma panel and a plasma

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.

Very fast method of control by semi-selective and selective addressing

The invention pertains to an alternating type of plasma panel. Each pixel is defined by three parallel and coplanar electrodes and by an electrode which is perpendicular to the other three electrodes and is separated from the other three electrodes by at least one dielectric layer. Two of the three parallel electrodes are connected to circuits giving the refresh signals to each pixel during operation. The electrode perpendicular to the other three and that electrode, of the other three parallel electrodes, which is not connected to a refresh circuit, are connected to circuits that give addressing signals to each pixel during operation. The electrodes that are connected to the refresh circuits constitute two arrays of electrodes connected to two refresh circuits.

Plasma panel with four electrodes per pixel and method for the control

Electro-optical display screen with control transistors wherein a cell of liquid crystal is controlled by the transistors and the row conductors set on one side of the cell as well as by the column conductors (C1, C2) set on the other side of the cell. Each transistor (T11) has its electrode gate (cg11) connected to a row conductor (L1), its source (cs11) connected to a neighbouring row conductor (L2) and its drain (cd11) connected to an electrode of the cell (E11). In a screen of this type, there is thus no intersection between conductors on one and the same side of the screen, nor between additional control conductors, an arrangement that provides for easier access to the control conductors.

Electro-optical display screen with control transistors

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.

Growing community of inventors

Le Fontanil, France

Michel Gay