Patents Assigned to Pixtech S.A.
  • Patent number: 5907215
    Abstract: A flat display screen includes a cathode (1) with microtips (2) for the electron bombardment of the anode (5) having phosphor elements (7r, 7g, 7b), the cathode (1) and the anode (5) separated by a vacuum space (12) containing a progressive hydrogen release source comprised of a thin layer of hydrogenated material. The progressive hydrogen release source may comprise a resistive layer (11) of the cathode (1) on which the microtips (2) are arranged. The progressive hydrogen release source provides the microtips (2) with a substantially constant emitting power.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: May 25, 1999
    Assignee: Pixtech S.A.
    Inventors: Stephane Mougin, Philippe Catania, Olivier Hamon
  • Patent number: 5903108
    Abstract: 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.
    Type: Grant
    Filed: May 5, 1997
    Date of Patent: May 11, 1999
    Assignee: Pixtech S.A.
    Inventors: Stephane Mougin, Francis Courreges, Bernard Bancal, Lionel Riviere-Cazaux
  • Patent number: 5872551
    Abstract: 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.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: February 16, 1999
    Assignee: Pixtech S.A.
    Inventors: Bernard Bancal, Axel Jaeger, Raynald Thevenet
  • Patent number: 5798609
    Abstract: A flat display screen includes two electrodes separated by an inner space. At least one first electrode is supported by a thin substrate and by a thick rigidifying plate, the inner space being defined by a peripheral frame placed between the electrodes, outside their useful surface.
    Type: Grant
    Filed: March 12, 1996
    Date of Patent: August 25, 1998
    Assignee: Pixtech S.A.
    Inventor: Jean-Marc Sol
  • Patent number: 5786660
    Abstract: A flat display screen has a cathode including microtips for electronic bombardment associated with a gate, an anode including phosphor elements, and an inter-electrode gap. The screen includes an apertured insulating plate defining the inter-electrode gap associated with means for maintaining the plate apart from the anode.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: July 28, 1998
    Assignee: Pixtech S.A.
    Inventor: Jean-Frederic Clerc
  • Patent number: 5785570
    Abstract: A method of fabricating an anode of a flat display screen that includes at least three series of alternated parallel strips of anode conductors is available. For each series of anode conductor strips, there is a single electrically connection pad, each pad being accessible through conductive paths from a same surface level of the anode.
    Type: Grant
    Filed: June 24, 1996
    Date of Patent: July 28, 1998
    Assignee: Pixtech S.A.
    Inventor: Marie-Dominique Bruni
  • Patent number: 5764000
    Abstract: An anode (5) for a flat display screen includes at least one group of phosphor strips (7) deposited over corresponding electrode strips (17) separated one from another by an insulating layer (8) etched out in front of the phosphor strips (7), and at least one conductor (21) interconnecting the electrode strips (17) of the group of phosphor strips (7). Each of the electrode strips (17) is formed by a resistive strip (18) for receiving one phosphor strip (7) and at least one biasing strip (19) which is parallel to and joins the interconnecting conductor (21). The biasing strip (19) has a low resistivity with respect to the resistivity of the associated resistive strip (18). The biasing strip (19) is parallel to, laterally borders, and is in contacting engagement with the resistive strip (18). The anode (5) eliminates the risk of electrical arcs between the anode (5) and gate (3) or between adjacent phosphor strips (7) of the anode (5), without impairing the brightness of the screen.
    Type: Grant
    Filed: March 12, 1996
    Date of Patent: June 9, 1998
    Assignee: Pixtech S.A.
    Inventors: Stephane Mougin, Francis Courreges, Jean-Marc Sol
  • Patent number: 5764204
    Abstract: 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.
    Type: Grant
    Filed: March 19, 1996
    Date of Patent: June 9, 1998
    Assignee: Pixtech S.A.
    Inventor: Bernard Bancal
  • Patent number: 5592056
    Abstract: An anode for flat display screens, of the type including at least one set of phosphor strips disposed over corresponding conductive strips and at least one interconnection conductor for the phosphor strips. Each conductive strip of each set is connected through a resistor to the associated interconnection conductor.
    Type: Grant
    Filed: September 27, 1995
    Date of Patent: January 7, 1997
    Assignee: Pixtech S.A.
    Inventors: Jean-Francois Peyre, Francis Courreges
  • Patent number: 5537001
    Abstract: A flat vacuum without pumping stem, for the manufacturing of display screens, comprises two plates made of glass, a sealing peripheral joint interrupted so as to provide an aperture for evacuation of the gases during manufacturing, a thin-film metallic pad disposed on each inner surface of the glass plates at the level of the aperture, and a sealing element made of metal having a low melting point disposed so as to contact the metallic pads.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: July 16, 1996
    Assignee: Pixtech S.A.
    Inventor: Jean-Frederic Clerc