Patents by Inventor Bo Kroll

Bo Kroll 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).

  • Publication number: 20200333609
    Abstract: The invention relates to a display device for representing two-dimensional and/or three-dimensional scenes. The display device comprises at least one illumination device to emit sufficiently coherent light, at least one spatial light modulation device, at least one optical system and a tracking device. A hologram is encoded into the at least one spatial light modulation device by means of a single-parallax encoding. The at least one optical system is provided to generate at least one virtual visibility region at the position of an eye of an observer. The encoding direction of the hologram on the spatial light modulation device is modifiable by means of the tracking device.
    Type: Application
    Filed: December 21, 2018
    Publication date: October 22, 2020
    Inventors: Norbert LEISTER, Bo KROLL
  • Publication number: 20200301362
    Abstract: A method for generating video holograms in real time for a holographic playback device comprising at least one light modulator means, into which a scene divided into object points is encoded as an entire hologram and can be seen as a reconstruction from a visibility region, which is located within a periodicity interval of the reconstruction of the video hologram, the visibility region defining a subhologram together with each object point of the scene to be reconstructed, and the entire hologram being generated from a superposition of contributions of subholograms, is characterized in that for each object point the contributions of the subholograms in the entire reconstruction of the scene can be determined from at least one look-up table.
    Type: Application
    Filed: June 8, 2020
    Publication date: September 24, 2020
    Inventors: Enrico ZSCHAU, Armin SCHWERDTNER, Bo KROLL, Alexander SCHWERDTNER
  • Patent number: 10761481
    Abstract: Disclosed is a holographic display including a spatial light modulator (SLM) with pixels, the SLM pixels being on a substrate, the SLM including circuitry which is on the same substrate as the SLM pixels, the circuitry operable to perform calculations which provide an encoding of the SLM.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: September 1, 2020
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventors: Bo Kroll, Robert Missbach, Alexander Schwerdtner
  • Patent number: 10684489
    Abstract: The invention relates to a light modulation device for a display for representing two- and/or three-dimensional image content or image sequences. The light modulation device comprises a light modulator and a controller. The phase and/or the amplitude of a light wave field, which is substantially collimated, can be varied by means of the light modulator depending on the location of the light modulator. The light modulator can be actuated by means of the control device. According to the invention, in the direction of propagation of the light wave field, at least one diffracting unit is arranged downstream of the light modulator. The diffracting unit has a variable diffracting structure. By means of the diffracting structure, the light wave field varied by the light modulator can be diffracted in a variable and predeterminable manner. Further, the present invention relates to a display and a method for producing a light modulation device.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: June 16, 2020
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventors: Bo Kroll, Norbert Leister, Gerald Futterer, Robert Missbach, Stephan Reichelt
  • Patent number: 10678188
    Abstract: A method for generating video holograms in real time for a holographic playback device comprising at least one light modulator means, into which a scene divided into object points is encoded as an entire hologram and can be seen as a reconstruction from a visibility region, which is located within a periodicity interval of the reconstruction of the video hologram, the visibility region defining a subhologram together with each object point of the scene to be reconstructed, and the entire hologram being generated from a superposition of contributions of subholograms, is characterized in that for each object point the contributions of the subholograms in the entire reconstruction of the scene can be determined from at least one look-up table.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: June 9, 2020
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventors: Enrico Zschau, Armin Schwerdtner, Bo Kroll, Alexander Schwerdtner
  • Publication number: 20200166754
    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.
    Type: Application
    Filed: July 12, 2018
    Publication date: May 28, 2020
    Inventors: Norbert LEISTER, Bo KROLL, Gerald FUTTERER
  • Patent number: 10509364
    Abstract: A light modulator, for a display for the presentation of two- and/or three-dimensional image contents or image sequences, includes two opposing substrates and electrodes. At least one liquid crystal layer is provided between the two substrates. An alignment means is provided on the substrate which faces the liquid crystal layer to set a predeterminable initial alignment of the liquid crystals. The orientation of the liquid crystals can be controlled in a given range through an electric field generated by the electrodes. The alignment means is controllable and can be controlled to modify the initial alignment of the liquid crystals. The alignment can be controlled such the orientation of the liquid crystals can be oriented outside the given range or so that the initial alignment of the liquid crystals can be set specifically for certain positions.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: December 17, 2019
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventors: Bo Kroll, Norbert Leister, Stephan Reichelt, Gerald Futterer
  • Publication number: 20190227492
    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.
    Type: Application
    Filed: July 12, 2017
    Publication date: July 25, 2019
    Applicant: SEEREAL TECHNOLOGIES S.A.
    Inventors: Bo KROLL, Norbert LEISTER
  • Patent number: 10168540
    Abstract: For comfortable viewing of a 3-D scene at various viewing angles, a display having a large tracking range for a variable viewer distance is required. A controllable light-influencing element deflects light in coarse steps in a viewer range. Within said steps, the light is deflected by a further controllable light-influencing element continuously or with fine gradation. The light modulation device is suitable in holographic or autostereoscopic displays for guiding the visibility ranges of the image information to be displayed so as to follow the eyes of the viewers.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: January 1, 2019
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventors: Bo Kroll, Gerald Futterer, Norbert Leister, Stephan Reichelt, Ralf Haussler
  • Publication number: 20180364643
    Abstract: The invention relates to methods for computing holograms for holographic reconstruction of two-dimensional and/or three-dimensional scenes in a display apparatus, wherein a scene for reconstruction is broken down into object points and the object points are encoded as sub-holograms into at least one spatial light modulation device of the display apparatus. A reconstructed scene is viewed from a region of visibility. At least one virtual plane of the at least one spatial light modulation device is stipulated on the basis of a real plane of the spatial light modulation device. A computation of sub-holograms is performed in the at least one virtual plane of the at least one spatial light modulation device.
    Type: Application
    Filed: March 29, 2016
    Publication date: December 20, 2018
    Inventors: Bo KROLL, Norbert LEISTER
  • Patent number: 10146180
    Abstract: A projection device is provided for displaying at least one of a two-dimensional and three-dimensional scene or of content. The projection device comprises an illumination device, at least two spatial light modulator devices and an optical system. The illumination device comprises at least one light source for generating a holographic illumination. One of said spatial light modulator devices is designed as spatial light modulator device modulating at least the phase of the light for the holographical generation of illumination patterns. This spatial light modulator device as first spatial light modulator device is followed by a second spatial light modulator device. The optical system is disposed to illuminate the second spatial light modulator device with a predefinable light distribution generated by the first spatial light modulator device.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: December 4, 2018
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventors: Norbert Leister, Gerald Fuetterer, Bo Kroll, Hagen Stolle
  • Publication number: 20180259905
    Abstract: A method for generating video holograms in real time for a holographic playback device comprising at least one light modulator means, into which a scene divided into object points is encoded as an entire hologram and can be seen as a reconstruction from a visibility region, which is located within a periodicity interval of the reconstruction of the video hologram, the visibility region defining a subhologram together with each object point of the scene to be reconstructed, and the entire hologram being generated from a superposition of contributions of subholograms, is characterized in that for each object point the contributions of the subholograms in the entire reconstruction of the scene can be determined from at least one look-up table.
    Type: Application
    Filed: May 14, 2018
    Publication date: September 13, 2018
    Inventors: Enrico ZSCHAU, Armin SCHWERDTNER, Bo KROLL, Alexander SCHWERDTNER
  • Publication number: 20180217554
    Abstract: Disclosed is a holographic display including a spatial light modulator (SLM) with pixels, the SLM pixels being on a substrate, the SLM including circuitry which is on the same substrate as the SLM pixels, the circuitry operable to perform calculations which provide an encoding of the SLM.
    Type: Application
    Filed: March 22, 2018
    Publication date: August 2, 2018
    Inventors: Bo KROLL, Robert MISSBACH, Alexander SCHWERDTNER
  • Patent number: 9946224
    Abstract: Disclosed is a holographic display including a spatial light modulator (SLM) with pixels, the SLM pixels being on a substrate, the SLM including circuitry which is on the same substrate as the SLM pixels, the circuitry operable to perform calculations which provide an encoding of the SLM.
    Type: Grant
    Filed: May 6, 2016
    Date of Patent: April 17, 2018
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventors: Bo Kroll, Robert Missbach, Alexander Schwerdtner
  • Publication number: 20170357098
    Abstract: For comfortable viewing of a 3-D scene at various viewing angles, a display having a large tracking range for a variable viewer distance is required. A controllable light-influencing element deflects light in coarse steps in a viewer range. Within said steps, the light is deflected by a further controllable light-influencing element continuously or with fine gradation. The light modulation device is suitable in holographic or autostereoscopic displays for guiding the visibility ranges of the image information to be displayed so as to follow the eyes of the viewers.
    Type: Application
    Filed: August 28, 2017
    Publication date: December 14, 2017
    Inventors: Bo KROLL, Gerald FUTTERER, Norbert LEISTER, Stephan REICHELT, Ralf HAUSSLER
  • Patent number: 9746684
    Abstract: For comfortable viewing of a 3-D scene at various viewing angles, a display having a large tracking range for a variable viewer distance is required. A controllable light-influencing element deflects light in coarse steps in a viewer range. Within said steps, the light is deflected by a further controllable light-influencing element continuously or with fine gradation. The light modulation device is suitable in holographic or autostereoscopic displays for guiding the visibility ranges of the image information to be displayed so as to follow the eyes of the viewers.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: August 29, 2017
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventors: Bo Kroll, Gerald Futterer, Norbert Leister, Stephan Reichelt, Ralf Haussler
  • Patent number: 9529326
    Abstract: The present invention relates to a light modulator device with a spatial light modulator, a structured polarizer means, a controllable polarization means and a light wave multiplexing means. The spatial light modulator comprises discretely addressable modulator cells. Two modulator cells each are combined to form a modulation element. The modulator cells modulate light waves which are capable of generating interference of a propagating light wave field with holographic information in a spatially structured way such that a specifiable spatial distribution of object light points of a three-dimensional scene is holographically reconstructed. The modulator cells of each modulation element are adjacently arranged regarding the direction of propagation of the light wave field. The light which is modulated by adjacently arranged modulator cells is given different polarization states by the structured polarizer means.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: December 27, 2016
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventors: Bo Kroll, Norbert Leister
  • Publication number: 20160291544
    Abstract: Disclosed is a holographic display including a spatial light modulator (SLM) with pixels, the SLM pixels being on a substrate, the SLM including circuitry which is on the same substrate as the SLM pixels, the circuitry operable to perform calculations which provide an encoding of the SLM.
    Type: Application
    Filed: May 6, 2016
    Publication date: October 6, 2016
    Inventors: Bo KROLL, Robert MISSBACH, Alexander SCHWERDTNER
  • Patent number: 9442332
    Abstract: A phase modulator for the modulation of the phase of circular polarised light which interacts with the phase modulator. The phase modulator has a first and a second substrate, an electrode arrangement and a liquid crystal layer with liquid crystal molecules. The first substrate is disposed adjacent to the second substrate. The liquid crystal layer is disposed between the two substrates. The first substrate has a first surface, and the second substrate has a second surface. The liquid crystal molecules situated next to the first surface are oriented substantially parallel to the first surface. The liquid crystal molecules situated next to the second surface are oriented substantially perpendicular to the second surface. An in-plane component of the liquid crystal molecule orientation can be set within an angular range of about 180°, e.g. between ?90° and +90° related to a specifiable central orientation.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: September 13, 2016
    Assignee: SEEREAL TECHNOLOGIES S.A.
    Inventors: Bo Kroll, Norbert Leister
  • Publication number: 20160202593
    Abstract: For comfortable viewing of a 3-D scene at various viewing angles, a display having a large tracking range for a variable viewer distance is required. A controllable light-influencing element deflects light in coarse steps in a viewer range. Within said steps, the light is deflected by a further controllable light-influencing element continuously or with fine gradation. The light modulation device is suitable in holographic or autostereoscopic displays for guiding the visibility ranges of the image information to be displayed so as to follow the eyes of the viewers.
    Type: Application
    Filed: March 21, 2016
    Publication date: July 14, 2016
    Inventors: Bo KROLL, Gerald FUTTERER, Norbert LEISTER, Stephan REICHELT, Ralf HAUSSLER