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    METHOD AND DEVICE FOR ENCODING COMPLEX-VALUE SIGNALS FOR THE RECONSTRUCTION OF THREE-DIMENSIONAL OBJECTS
    23.
    发明公开
    METHOD AND DEVICE FOR ENCODING COMPLEX-VALUE SIGNALS FOR THE RECONSTRUCTION OF THREE-DIMENSIONAL OBJECTS 审中-公开

    公开(公告)号：US20240134313A1

    公开(公告)日：2024-04-25

    申请号：US18464684

    申请日：2023-09-11

    Applicant: SEEREAL TECHNOLOGIES S.A.

    Inventor： Stefan REICHELT ,  Norbert LEISTER ,  Anne FRAUENHOFER

    IPC: G03H1/08 ,  G03H1/16 ,  G03H1/32 ,  G06T9/00

    CPC classification number: G03H1/0808 ,  G03H1/16 ,  G03H1/32 ,  G06T9/00 ,  G03H2001/0816

    Abstract: A method for encoding complex-valued signals of a computer-generated hologram into a phase-modulating optical element for the reconstruction of a three-dimensional object, and to a computer program product for encoding complex-valued signals of a computer-generated hologram, and to a holographic display for the reconstruction of a three-dimensional object. The object is to reduce the effort on encoding a complex-valued spatial distribution by an iteration method on the basis of phase encoding, so that the computer-generated hologram resulting therefrom can be represented more rapidly and with the same or an improved reconstruction quality. In particular, the convergence during the iterative optimization is intended to be accelerated. This is achieved by a method in which degrees of freedom of the hologram plane as well as the reconstruction plane are used for optimizing the iteration method for rapid convergence and maximization of the diffraction efficiency in the signal range.

    Illumination device
    24.
    发明授权
    Illumination device 有权

    公开(公告)号：US11300924B2

    公开(公告)日：2022-04-12

    申请号：US16080728

    申请日：2017-03-02

    Applicant: SEEREAL TECHNOLOGIES S.A.

    Inventor： Gerald Futterer

    IPC: G03H1/00 ,  G03H1/22 ,  G02B5/02 ,  G02B27/09 ,  G03H1/32 ,  G02B5/32 ,  G03H1/04 ,  G03H1/02 ,  G02B26/06 ,  G02B3/00 ,  G02B27/48 ,  G02B19/00

    Abstract: An illumination device for illuminating a spatial light modulator device. Sub-holograms are used for encoding a hologram into the spatial light modulator device. The Illumination device includes at least one light source for emitting light for illuminating the spatial light modulator device and a beam shaping unit. The beam shaping unit provides a flat-top plateau-type distribution of an absolute value of a complex degree of mutual coherence of the light in a plane of the spatial light modulator device to be illuminated. The flat-top plateau-type distribution of the absolute value of the complex degree of mutual coherence has a shape that is at least similar to a shape of the largest sub-hologram used for encoding of object points into the spatial light modulator device.

    METHOD AND DEVICE FOR ENCODING COMPLEX-VALUE SIGNALS FOR THE RECONSTRUCTION OF THREE-DIMENSIONAL OBJECTS
    25.
    发明申请
    METHOD AND DEVICE FOR ENCODING COMPLEX-VALUE SIGNALS FOR THE RECONSTRUCTION OF THREE-DIMENSIONAL OBJECTS 有权

    公开(公告)号：US20210208536A1

    公开(公告)日：2021-07-08

    申请号：US16071096

    申请日：2017-01-18

    Applicant: SEEREAL TECHNOLOGIES S.A.

    Inventor： Stefan REICHELT ,  Norbert LEISTER ,  Anne FRAUENHOFER

    IPC: G03H1/08 ,  G03H1/32 ,  G03H1/16 ,  G06T9/00

    Abstract: A method for encoding complex-valued signals of a computer-generated hologram into a phase-modulating optical element for the reconstruction of a three-dimensional object, and to a computer program product for encoding complex-valued signals of a computer-generated hologram, and to a holographic display for the reconstruction of a three-dimensional object. The object is to reduce the effort on encoding a complex-valued spatial distribution by an iteration method on the basis of phase encoding, so that the computer-generated hologram resulting therefrom can be represented more rapidly and with the same or an improved reconstruction quality. In particular, the convergence during the iterative optimization is intended to be accelerated. This is achieved by a method in which degrees of freedom of the hologram plane as well as the reconstruction plane are used for optimizing the iteration method for rapid convergence and maximization of the diffraction efficiency in the signal range.

    Display device
    26.
    发明授权
    Display device 有权

    公开(公告)号：US11048209B2

    公开(公告)日：2021-06-29

    申请号：US16317328

    申请日：2017-07-12

    Applicant: SEEREAL TECHNOLOGIES S.A.

    Inventor： Bo Kroll ,  Norbert Leister

    IPC: G03H1/26 ,  G09G3/00 ,  G02B27/01 ,  G02B5/18 ,  G02B5/30 ,  G02B27/00 ,  G03H1/02 ,  G09G3/02 ,  G02B26/06

    Abstract: The invention relates to a display device, in particular a head-mounted display or a head-up display, for representing a two-dimensional and/or three-dimensional scene. The display device comprises a spatial light modulator device having pixels, and a beam offset device. The spatial light modulator device is illuminatable with light. The beam offset device is configured to be controllable in such a way that the light modulated by the pixels of the spatial light modulator device is laterally displaceable by less than one pixel extent.

    DISPLAY DEVICE COMPRISING A LIGHT GUIDE
    27.
    发明申请
    DISPLAY DEVICE COMPRISING A LIGHT GUIDE 审中-公开

    公开(公告)号：US20200183079A1

    公开(公告)日：2020-06-11

    申请号：US16614407

    申请日：2018-05-18

    Applicant: SEEREAL TECHNOLOGIES S.A.

    Inventor： Norbert LEISTER

    IPC: F21V8/00 ,  G02F1/29 ,  G02B27/01 ,  G03H1/22

    Abstract: The invention relates to a display device, in particular a provided near-to-eye display device of a user. The display device comprises at least one illumination device, at least one spatial light modulator device, at least one imaging element, at least one light guide, and at least two partially-reflective decoupling elements. The at least one illumination device is used for emitting sufficiently coherent light. The at least one imaging element is provided for imaging light originating from the at least one light modulator device. The at least two partially-reflective decoupling elements, which are provided in the at least one light guide, are used for coupling the light out of the light guide.

    DISPLAY DEVICE FOR ENLARGING THE FIELD OF VIEW
    28.
    发明申请
    DISPLAY DEVICE FOR ENLARGING THE FIELD OF VIEW 审中-公开

    公开(公告)号：US20200166754A1

    公开(公告)日：2020-05-28

    申请号：US16630648

    申请日：2018-07-12

    Applicant: SEEREAL TECHNOLOGIES S.A.

    Inventor： Norbert LEISTER ,  Bo KROLL ,  Gerald FUTTERER

    IPC: G02B27/01 ,  G02B5/18 ,  G02B27/00 ,  F21V8/00

    Abstract: A display device for representing two-dimensional and/or three-dimensional objects or scenes, having at least one spatial light modulation device having pixels for modulating light, at least one optical system, and at least one light guiding device. Light beams originating from the individual pixels of the spatial light modulation device are incident on the at least one light guiding device at different angles on average in relation to the surface of the at least one light guiding device and can be coupled therein, whereby a coupling angular spectrum is definable. The light beams propagating in the at least one light guiding device can be coupled out of the at least one light guiding device at different angles on average in relation to an observer region, whereby a decoupling angular spectrum is definable. The decoupling angular spectrum is enlarged in comparison to the coupling angular spectrum.

    DEVICE FOR COMBINING LIGHT BEAMS WHICH INTERACT WITH ADJACENTLY ARRANGED PIXELS OF A LIGHT MODULATOR
    29.
    发明申请
    DEVICE FOR COMBINING LIGHT BEAMS WHICH INTERACT WITH ADJACENTLY ARRANGED PIXELS OF A LIGHT MODULATOR 审中-公开

    公开(公告)号：US20200033672A1

    公开(公告)日：2020-01-30

    申请号：US16337585

    申请日：2017-09-29

    Applicant: SEEREAL TECHNOLOGIES S.A.

    Inventor： Norbert LEISTER ,  Stephan REICHELT

    IPC: G02F1/1335 ,  G02F1/13363 ,  G03H1/22

    Abstract: The present invention relates to a device for combining light beams which interact with adjacently arranged pixels of a light modulator. The present invention furthermore relates to a device for beam combination and to a spatial light modulation device for complex-valued modulation. The invention relates to a device for beam combination, and to an optical arrangement of polarization-sensitive component parts which allows complex-valued modulation of a light field by means of a phase-modulating light modulator and a beam combiner, which is insensitive to changes in the incidence direction of the illumination wave. This document furthermore also relates to various arrangements of reflectively operating light modulators.

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