Patents by Inventor Cécile Joubert

Cécile Joubert has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8085370
    Abstract: The application relates to a single-polarizer reflective bistable twisted nematic (BTN) liquid crystal display device comprising a liquid crystal layer of thickness d, birefringence ?n and retardation ?nd, said liquid crystal layer being situated between two substrates and between a polarizer and a reflector, said liquid crystal layer in the absence of an applied electric field having two stable uniformly twisted textures, the twists of the two stable textures differing by an angle being equal mainly to 180°, and at least one compensation layer positioned between said polarizer and said reflector, said compensation layer being composed of at least one birefringent film, said birefringent film having an optical anisotropy defined by three characteristic refractive indices nx, ny, nz, along three corresponding axis x, y, z of index ellipsoid, x and y being situated inside the substrates plane, nx and ny being called in plane indices, with nx?ny, x being called slow axis, and z being perpendicular to the substra
    Type: Grant
    Filed: May 10, 2006
    Date of Patent: December 27, 2011
    Assignee: Nemoptic
    Inventors: Cécile Joubert, Terry Scheffer
  • Patent number: 7532275
    Abstract: The invention relates to a nematic liquid crystal display having two stable states, without an electric field, obtained by anchoring break, characterized in that it comprises two polarizers (10, 40), one (10) of which is placed on the observer side, the other (40) being placed on the opposite side of the liquid crystal cell whereby the latter is at least partially reflecting in order to define a reflective mode or transflective mode. The orientation of the two polarizers (10, 40) is offset by a value which is equal to the rotatory power of the cell at approximately +/?30°.
    Type: Grant
    Filed: November 25, 2004
    Date of Patent: May 12, 2009
    Assignee: Nemoptic
    Inventors: Cécile Joubert, Daniel Stoenescu, Alexandre Carton, Patrice Davi
  • Publication number: 20070103619
    Abstract: The invention relates to a nematic liquid crystal display having two stable states, without an electric field, obtained by anchoring break, characterized in that it comprises two polarizers (10, 40), one (10) of which is placed on the observer side, the other (40) being placed on the opposite side of the liquid crystal cell whereby the latter is at least partially reflecting in order to define a reflective mode or transflective mode. The orientation of the two polarizers (10, 40) is offset by a value which is equal to the rotatory power of the cell at approximately +/?30°.
    Type: Application
    Filed: November 25, 2004
    Publication date: May 10, 2007
    Applicant: NEMOPTIC
    Inventors: Cécile Joubert, Daniel Stoenescu, Alexandre Carton, Patrice Davi
  • Patent number: 7176998
    Abstract: A display device comprising a liquid-crystal cell element (20) placed between two polarizers (23, 28) comprising at least one optical structure for compensating for the variations in birefringence of said liquid crystal according to the viewing angle. The optical compensation structure comprises at least one oblique-axis film (25, 26) of polymerized liquid-crystal type suitable for at least partly compensating for the undesirable effects of the natural birefringence of the liquid crystal, combined with a volume hologram (24, 27) of small retardation suitable for improving the compensatability of said film.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: February 13, 2007
    Assignee: Thales
    Inventors: Cécile Joubert, Bertrand Morbieu, Laurent Bignolles
  • Patent number: 6980336
    Abstract: A document includes at least one drawing or data produced, for example, by printing. In addition, this document includes a hologram representing part of the document. The hologram of this document is recorded using a system including a prerecorded or electrically controllable optical modulator in which the image of at least part of the document is recorded. This modulator is designed to be combined with a layer of photosensitive material. A first reference wave illuminates the layer of photosensitive material. A second wave incident on the modulator and giving rise to a third object wave is also transmitted to the layer of photosensitive material in order to interfere with the reference wave in this layer.
    Type: Grant
    Filed: October 25, 2004
    Date of Patent: December 27, 2005
    Assignee: Thales
    Inventors: Cécile Joubert, Brigitte Loiseaux, Philippe Robin, Claude Bricot
  • Patent number: 6873443
    Abstract: A document includes at least one drawing or data produced, for example, by printing. In addition, this document includes a hologram representing part of the document. The hologram of this document is recorded using a system including a prerecorded or electrically controllable optical modulator in which the image of at least part of the document is recorded. This modulator is designed to be combined with a layer of photosensitive material. A first reference wave illuminates the layer of photosensitive material. A second wave incident on the modulator and giving rise to a third object wave is also transmitted to the layer of photosensitive material in order to interfere with the reference wave in this layer.
    Type: Grant
    Filed: July 4, 2000
    Date of Patent: March 29, 2005
    Assignee: Thales
    Inventors: Cécile Joubert, Brigitte Loiseaux, Philippe Robin, Claude Bricot
  • Patent number: 6426810
    Abstract: Color display system, which includes an electrooptic modulation screen (LCD) and in which a chromatic modulator (RC) is provided between the multiple-wavelength light source (S, C) and the screen (LCD). This chromatic modulator modulates a wavelength or a restricted range of wavelengths of the source in order to adjust the saturation of the various primaries transmitted to the screen as well as to effect colorimetric balance. Applications include liquid-crystal color displays.
    Type: Grant
    Filed: May 7, 1997
    Date of Patent: July 30, 2002
    Assignee: Thomson-CSF
    Inventors: Cécile Joubert, Brigitte Loiseaux, Jean-Pierre Huignard, Anne Delboulbe
  • Patent number: 6384974
    Abstract: A polarization splitter which includes a splitting medium lying between two transparent elements of defined indices. The splitting medium includes a periodic structure of layers of materials of different indices and having a period which is small compared with the wavelength of an incident beam so as to form a uniaxial birefringent medium of optical axis perpendicular to the plane of the periodic structure. The two transparent elements are made of a material of index approximately equal to the ordinary index (no) of the periodic structure.
    Type: Grant
    Filed: January 11, 2001
    Date of Patent: May 7, 2002
    Assignee: Thomson-CSF
    Inventors: Cécile Joubert, Jean-Claude Lehureau
  • Patent number: 6288805
    Abstract: A holographic projection screen for large screen projection and back projection with a liquid crystal projector. The screen includes at least one layer made of a photosensitive material in which at least one index grating may be recorded by an interference of an optical recording wave with an optical object wave. The thickness of the layer is equal to or greater than n0&Lgr;2/2&pgr;, where n0 is the average index of the photosensitive material, &Lgr; is the average spacing of the index grating and &lgr; is the recording wavelength.
    Type: Grant
    Filed: February 15, 1996
    Date of Patent: September 11, 2001
    Assignee: Thomson-CSF
    Inventors: Jean-Pierre Huignard, Cécile Joubert, Jean-Claude Lehureau, Brigitte Loiseaux
  • Patent number: 6246521
    Abstract: A compact illumination device intended especially for illuminating an active matrix in a monochromatic or trichromatic display device. This device includes a source and collimating device in order to deliver a lighting direction from the source along a direction (Dy) and two optical components (M1) and (M2) which anamorphose the lighting in a direction parallel to the direction (Dy) and in a direction (Dz) perpendicular to the direction (Dy), respectively. These components may typically be of the holographic grating type operating in transmission or in reflection.
    Type: Grant
    Filed: May 5, 1999
    Date of Patent: June 12, 2001
    Assignee: Thomson-CSF
    Inventors: Anne Delboulbe, Jean-Pierre Huignard, Cécile Joubert, Brigitte Loiseaux