Pixtech S.a.

Bernard Bancal

Philippe Peyron

Stephane Mougin

Francis Courreges

Jean-Luc Grand-Clement

Lionel Riviere-Cazaux

Thierry Frayssinet

Jean-Marc Dubois

Raynald Thevenet

Pascal Olivier

Mathias Richter

Jean-Fran&ccedil;ois Peyre

Axel Jaeger

A flat display screen anode, including phosphor elements intended for being excited by an electron bombarding, these elements being deposited on at least one biasing electrode including, at least under the phosphor elements, a resistive layer deposited on a conductive layer for biasing the phosphor element.

Flat display screen resistive anode

A cathode plate of a flat display screen of the type including a set of electron emission cathode conductors, organized in columns, a set of electron extraction grid conductors, organized in rows, and a peripheral protection area, surrounding an active area taking part in the display, to prevent propagation of secondary electrons out of the perimeter of the protection area.

Flat display screen cathode plate

A cathode-grid plate of a field-effect flat display screen of the type including a first set of row conductors, a second set of column conductors and, for each screen pixel, defined by the intersection of a column and of a line, an element for temporarily storing the luminance control signal of the considered pixel.

Flat display screen with an addressing memory

A push-pull switch including a first N-channel MOS transistor, the drain-source path of which is connected between a high voltage terminal and an output terminal, a first resistor connected between the gate of the first transistor and the high voltage, a diode having its anode connected to the output terminal and its cathode connected to the gate of the first transistor, a second N-channel MOS transistor having its drain connected to the cathode of the diode, its source connected to a reference potential, and its gate connected to a control terminal, and a second resistor connected between the gate of the second transistor and the output terminal.

Very high voltage switch

The present invention relates to a flat display screen, comprising a cathode with electron emission microtips associated with a grid for extracting electrons from the microtips, the cathode/grid comprising conductive grid or cathode lines adapted to being sequentially addressed, and cathode or grid columns perpendicular to the lines and adapted to being addressed individually and simultaneously during the addressing of a line, and the screen comprising a return electrode adapted to being biased to a return potential corresponding to a no electron emission potential, each grid or cathode line being connected, via at least one resistive element, to the return electrode.

Flat display screen including a cathode having electron emission microtips associated with a grid for extracting electrons from the microtips

The present invention relates to a method for regenerating microtips of a flat display screen including a cathode with electronic emission microtips associated with a grid for extracting electrons emitted by the microtips, wherein the microtips are made to emit under a current density which is substantially higher than a nominal operating current density and for a duration which is substantially higher than a nominal operating addressing duration.

Method for regenerating microtips of a flat display screen

A flat color microtip screen including a cathode divided into columns addressable independently; a first pixel selection grid divided into rows; a second color selection grid including a plurality of groups of slots extending along in columns, each group of three slots corresponding to a cathode column, slots of the same row of each group being connected to a same terminal; an anode including groups of three parallel bands of luminescent material, each band corresponding to one of the slots, all bands being at the same potential.

Double grid microtip color screen

A flat display screen comprises a microtip cathode for electronically bombarding an anode including at least two groups of alternate conductive strips with phosphor strips and a control circuit adapted to sequentially address each group. The control circuit includes means for applying, at least temporarily, to each group of conductive strips a voltage lower than the minimum biasing voltage of the cathode's microtips.

Device for switching the anode of a flat display screen

A device for controlling an electrode of a flat display screen includes a first electrode constituting a microtip cathode, a second electrode constituting an anode provided with phosphor elements and a gate that is arranged in rows. At least one of the electrodes is arranged in columns. The device includes circuitry for individually addressing each column and for interrupting the biasing of a column as soon as its charge reaches a threshold voltage corresponding to a desired luminescence value.

Addressing device for microtip flat display screens

The present invention relates to a flat display screen anode of the type including an active area having phosphor elements, the active area being surrounded with at least one track in a material having a secondary emission coefficient lower than or equal to one.

Flat display screen anode with protection ring for collecting secondary

A method for controlling a cathodoluminescent screen consists of providing regeneration steps during which at least a portion of the anodes is at a low voltage and the corresponding cathodes are biased to an emission state. When the screen is a microtip color screen, regeneration steps are provided between the operation steps and, during the regeneration steps, all the anodes are at a low voltage, the microtips and the gates being biased to an emission state.

Method for controlling a flat display screen

A flat display screen includes a cathode arranged in columns for electronically bombarding an anode including phosphor elements, a first gate arranged in rows to be individually addressed, and a second gate formed by at least two combs of alternate paths parallel with the rows of the first gate. A same row of the first gate is associated with a path of each comb and the interconnection of each path with a cathode column defines a screen pixel.

Growing community of inventors

Luynes, France

Bernard Bancal