公开(公告)号：US10678188B2

公开(公告)日：2020-06-09

申请号：US15978916

申请日：2018-05-14

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Enrico Zschau ,  Armin Schwerdtner ,  Bo Kroll ,  Alexander Schwerdtner

IPC: G03H1/08 ,  G03H1/22

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.

公开(公告)号：US10585394B2

公开(公告)日：2020-03-10

申请号：US15429759

申请日：2017-02-10

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Norbert Leister

IPC: G03H1/08 ,  G03H1/22 ,  G02B27/42 ,  G03H1/26

Abstract: A hologram is constructed from individual subholograms assigned to corresponding encoding regions in a light modulation device and respectively assigned to an object point of the object to be reconstructed with the hologram. With a virtual observer window, a defined viewing region is provided through which a reconstructed scene in a reconstruction space is observed by an observer. A complex value of a wavefront for each individual object point is calculated in the virtual observer window. Each individual amplitude of a complex value of a wavefront in the virtual observer window is subsequently multiplied by a correction value with which a correction of the angle selectivity of at least one volume grating arranged downstream in the beam path of the light modulation device is carried out. The corrected complex values determined in this way for all object points are summed and transformed into the hologram plane of the light modulation device.

公开(公告)号：US10520889B2

公开(公告)日：2019-12-31

申请号：US15241327

申请日：2016-08-19

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Enrico Zschau ,  Nils Pfeifer

IPC: G03H1/26 ,  G03H1/08 ,  G03H1/22 ,  G03H3/00

Abstract: Method for computing the code for the reconstruction of three-dimensional scenes which include objects which partly absorb light or sound. The method can be implemented in a computing unit. In order to reconstruct a three-dimensional scene as realistic as possible, the diffraction patterns are computed separately at their point of origin considering the instances of absorption in the scene. The method can be used for the representation of three-dimensional scenes in a holographic display or volumetric display. Further, it can be carried out to achieve a reconstruction of sound fields in an array of sound sources.

公开(公告)号：US10359626B2

公开(公告)日：2019-07-23

申请号：US15355340

申请日：2016-11-18

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Norbert Leister

IPC: G09G5/00 ,  G02B27/00 ,  H04N13/315 ,  H04N13/32 ,  H04N13/366 ,  H04N13/368 ,  H04N13/383 ,  H04N13/398 ,  G02F1/13 ,  G02F1/1337 ,  G02F1/29 ,  G02B5/32 ,  G03H1/22 ,  G02B27/22 ,  G02B5/20 ,  G02B27/26 ,  G06F3/01 ,  G02F1/01 ,  G02F1/13363 ,  G03H1/02

Abstract: The invention relates to a display, in particular an autostereoscopic or holographic display, for representing preferably three-dimensional information, wherein the stereo views or the reconstructions of the holographically encoded objects can be tracked to the movements of the associated eyes of one or more observers in a finely stepped manner within a plurality of zones of the movement region. In this case, the zones are selected by the activation of switchable polarization gratings.

公开(公告)号：US10353344B2

公开(公告)日：2019-07-16

申请号：US14896085

申请日：2014-06-04

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Enrico Zschau

IPC: G03H1/08 ,  G03H1/22 ,  G03H1/26

Abstract: An apparatus and a method for optimized calculation of 2D sub-holograms for object points of a three-dimensional scene and a pipeline for real-time calculation of holograms are provided. The invention shortens the calculation time of a hologram for representing a three-dimensional scene and/or to reduce the calculation complexity of such a hologram. This is achieved by a 2D sub-hologram of an object point, which has image elements of the spatial light modulator, comprises a half 1D sub-hologram, where the radius of each image element is determined and each image element of the 2D sub-hologram is fixedly assigned to at least one image element of the half 1D sub-hologram with identical or similar radius by way of an electronic circuit, by a method for encoding a hologram, and by a pipeline on the basis of FPGA and/or ASIC.

公开(公告)号：US10268080B2

公开(公告)日：2019-04-23

申请号：US15615372

申请日：2017-06-06

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Norbert Leister

IPC: G02F1/139 ,  G02F1/1337 ,  G02F1/1343 ,  G02F1/29 ,  G02F1/137

Abstract: A phase modulator for polarized light, comprising a first substrate with a first surface and a second substrate with a second surface, a liquid crystal layer between the two substrates and an electrode arrangement. The phase modulator is usable as a variable deflection grating, and liquid crystal materials which are currently conventional are usable for its production. A phase modulator has an out-of-plane angle of the liquid crystal molecules next to the two surfaces whose magnitude is greater than 0 but less than or equal to 45 degrees, and an electrode arrangement controllable such that an in-plane component of the liquid crystal molecule orientation is adjustable in an angle range of up to 180 degrees, and the rotation sense of the liquid crystal molecules next to the first surface is opposite to the rotation sense of the liquid crystal molecules next to the second surface.

公开(公告)号：US10168540B2

公开(公告)日：2019-01-01

申请号：US15687585

申请日：2017-08-28

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Bo Kroll ,  Gerald Futterer ,  Norbert Leister ,  Stephan Reichelt ,  Ralf Haussler

IPC: G02B27/22 ,  H04N13/366 ,  H04N13/305 ,  H04N13/31 ,  G03H1/02 ,  H04N13/32 ,  H04N13/322 ,  G02B5/32 ,  G02B26/08 ,  G02B27/00 ,  G02F1/29 ,  G03H1/22 ,  G03H1/26 ,  G02F1/13

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.

公开(公告)号：US20180259905A1

公开(公告)日：2018-09-13

申请号：US15978916

申请日：2018-05-14

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Enrico ZSCHAU ,  Armin SCHWERDTNER ,  Bo KROLL ,  Alexander SCHWERDTNER

IPC: G03H1/22 ,  G03H1/08

CPC classification number: G03H1/2294 ,  G03H1/0808 ,  G03H2001/0833 ,  G03H2210/30 ,  G03H2210/452 ,  G03H2226/05

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.

公开(公告)号：US09927571B2

公开(公告)日：2018-03-27

申请号：US14438272

申请日：2013-10-24

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Gerald Futterer

IPC: F21V7/04 ,  F21V8/00 ,  G02B6/02 ,  G02B27/22 ,  H05B37/02

CPC classification number: G02B6/005 ,  G02B6/0023 ,  G02B6/0025 ,  G02B6/0031 ,  G02B6/0068 ,  G02B6/0076 ,  G02B6/02057 ,  G02B27/22 ,  H05B37/0218

Abstract: An illumination device for illuminating at least one spatial light modulator device. At least one light source device with at least one light source illuminates the at least one spatial light modulator device; a light guiding element through which light emanating from the light source propagates; and at least one light decoupling element arranged on top or inside of the light guiding element. The at least one light decoupling element decouples of a wave field of the light which propagating in the light guiding element into the direction of the spatial light modulator device. The light guiding element has a refractive index which is lower than or at least equal to the refractive index of the at least one light decoupling element. The entrance angle of the wave field entering the light decoupling element is determined by the difference between the refractive indices according to a particular equation.

公开(公告)号：US20170038728A1

公开(公告)日：2017-02-09

申请号：US15241327

申请日：2016-08-19

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Enrico ZSCHAU ,  Nils PFEIFER

IPC: G03H1/08 ,  G03H1/26 ,  G03H3/00 ,  G03H1/22

CPC classification number: G03H1/0808 ,  G03H1/2202 ,  G03H1/2249 ,  G03H1/2294 ,  G03H1/26 ,  G03H3/00 ,  G03H2001/2242 ,  G03H2001/2625 ,  G03H2210/12 ,  G03H2210/30 ,  G03H2210/36 ,  G03H2210/452 ,  G03H2210/63 ,  G03H2226/02 ,  G03H2226/05 ,  G03H2240/51 ,  G03H2240/56

Abstract: Method for computing the code for the reconstruction of three-dimensional scenes which include objects which partly absorb light or sound. The method can be implemented in a computing unit. In order to reconstruct a three-dimensional scene as realistic as possible, the diffraction patterns are computed separately at their point of origin considering the instances of absorption in the scene. The method can be used for the representation of three-dimensional scenes in a holographic display or volumetric display. Further, it can be carried out to achieve a reconstruction of sound fields in an array of sound sources.

Abstract translation: 用于计算用于重建三维场景的代码的方法，所述三维场景包括部分地吸收光或声音的对象。 该方法可以在计算单元中实现。 为了尽可能重建立体场景，考虑到场景吸收的实例，衍射图案在它们的起点处分开计算。 该方法可用于全息显示或体积显示中三维场景的表示。 此外，可以实现在声源阵列中实现声场的重建。