公开(公告)号：US11754972B2

公开(公告)日：2023-09-12

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 ,  G03H1/16 ,  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.

公开(公告)号：US20220357702A1

公开(公告)日：2022-11-10

申请号：US17813176

申请日：2022-07-18

Applicant: SEEREAL TECHNOLOGIES GMBH

Inventor： Norbert LEISTER ,  Ralf HAUSSLER ,  Armin SCHWERDTNER

IPC: G03H1/08 ,  G03H1/22 ,  G03H1/00 ,  G03H1/26 ,  G03H1/32

Abstract: A method of computing a hologram by determining the wavefronts at the approximate observer eye position that would be generated by a real version of an object to be reconstructed. In normal computer generated holograms, one determines the wavefronts needed to reconstruct an object; this is not done directly in the present invention. Instead, one determines the wavefronts at an observer window that would be generated by a real object located at the same position of the reconstructed object. One can then back-transforms these wavefronts to the hologram to determine how the hologram needs to be encoded to generate these wavefronts. A suitably encoded hologram can then generate a reconstruction of the three-dimensional scene that can be observed by placing one's eyes at the plane of the observer window and looking through the observer window.

公开(公告)号：US11487153B2

公开(公告)日：2022-11-01

申请号：US17001395

申请日：2020-08-24

Applicant: Samsung Display Co., Ltd. ,  Seoul National University R&DB Foundation

Inventor： Sang Ho Kim ,  Duk Ho Lee ,  Young Chan Kim ,  Ki Seung Bang ,  Chang Won Jang ,  Ji Won Lee ,  Cheon Myeong Lee ,  Byoung Ho Lee

IPC: G02F1/13357 ,  G03H1/32

Abstract: A backlight device includes: a light source to emit coherent light; an optical path difference generator on the light source, the optical path difference generator including an incident surface and a plurality of light emitting surfaces, the light emitting surfaces being parallel to the incident surface and having different separation distances from the incident surface; a light condenser on the optical path difference generator; a diffuser on the light condenser; and a collimator on the diffuser.

公开(公告)号：US11409242B2

公开(公告)日：2022-08-09

申请号：US16051945

申请日：2018-08-01

Applicant: Dualitas Ltd.

Inventor： Jamieson Christmas ,  Alexander Cole

IPC: G03H1/08 ,  G03H1/22 ,  G02B27/01 ,  G02B27/48 ,  G03H1/32 ,  G02B5/02 ,  G03B21/00 ,  G03H1/16

Abstract: A holographic projector includes a spatial light modulator, a light receiving member and a driver. The spatial light modulator is arranged to receive and represent a computer-generated hologram and spatially modulate light incident on the spatial light modulator to form a holographic reconstruction in accordance with the computer-generated hologram. The light receiving member is arranged to receive spatially modulated light along an optical axis from the spatial light modulator and the holographic reconstruction is formed on the light receiving member. The driver is coupled to the light receiving member to move the light receiving member in a plane. The driver is configured to move the light receiving member while maintaining an orientation of the light receiving member relative to the spatial light modulator substantially constant.

公开(公告)号：US10948878B2

公开(公告)日：2021-03-16

申请号：US16169005

申请日：2018-10-24

Applicant: Dai Nippon Printing Co., Ltd.

Inventor： Makio Kurashige ,  Kazutoshi Ishida ,  Tomoe Takanokura ,  Yasuyuki Ooyagi

IPC: G03H1/26 ,  G02B5/32 ,  G02B26/10 ,  G02B27/48 ,  G03B21/20 ,  G03B33/06 ,  G03H1/22 ,  H04N9/31 ,  G03H1/32 ,  G03H1/00

Abstract: An optical device including a hologram recording medium that can reproduce an image of a reference member and an irradiation unit that emits a coherent light beam to the optical device. The irradiation unit includes a light source for emitting a coherent light beam and a scanning device capable of adjusting a reflection angle of the coherent light beam emitted from the light source and that makes a reflected coherent light beam scan the hologram recording medium. The light source has light sources for emitting coherent light beams having different wavelength ranges. The hologram recording medium has a plurality of recording areas to be scanned with a plurality of coherent light beams reflected by the scanning device, respectively. Each of the plurality of recording areas has an interference fringe that diffracts a coherent light beam of the corresponding wavelength range.

公开(公告)号：US10761481B2

公开(公告)日：2020-09-01

申请号：US15928891

申请日：2018-03-22

Applicant: SEEREAL TECHNOLOGIES S.A.

Inventor： Bo Kroll ,  Robert Missbach ,  Alexander Schwerdtner

IPC: G03H1/04 ,  G03H1/02 ,  G03H1/22 ,  G09G3/20 ,  G03H1/08 ,  G03H1/26 ,  G06F3/01 ,  G02B26/08 ,  G03H1/00 ,  G03H1/32

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.

公开(公告)号：US20190212573A1

公开(公告)日：2019-07-11

申请号：US16352696

申请日：2019-03-13

Applicant: DigiLens Inc.

Inventor： Milan Momcilo Popovich ,  Jonathan David Waldern ,  John James Storey

IPC: G02B27/48 ,  G03H1/32 ,  F21V8/00 ,  G02F1/1335 ,  G02F1/137 ,  G03H1/02 ,  G02B5/18 ,  G02F1/1334 ,  G02B27/42 ,  G02F1/01 ,  G03B21/20

CPC classification number: G02B27/48 ,  G02B5/1828 ,  G02B6/0023 ,  G02B6/0035 ,  G02B6/005 ,  G02B27/425 ,  G02F1/0136 ,  G02F1/13342 ,  G02F1/133553 ,  G02F1/133606 ,  G02F1/13731 ,  G02F2203/62 ,  G03B21/2033 ,  G03H1/0248 ,  G03H1/32

Abstract: An Electrically Switchable Bragg Grating (ESBG) despeckler device comprising at least one ESBG element recorded in a hPDLC sandwiched between transparent substrates to which transparent conductive coatings have been applied. At least one of said coatings is patterned to provide a two-dimensional array of independently switchable ESBG pixels. Each ESBG pixel has a first unique speckle state under said first applied voltage and a second unique speckle state under said second applied voltage.

公开(公告)号：US20180088528A1

公开(公告)日：2018-03-29

申请号：US15679228

申请日：2017-08-17

Applicant: SEEREAL TECHNOLOGIES GMBH

Inventor： Norbert LEISTER ,  Ralf HAUSSLER ,  Armin SCHWERDTNER

IPC: G03H1/08 ,  G03H1/00 ,  G03H1/22 ,  G03H1/26 ,  G03H1/32 ,  G03H1/30

CPC classification number: G03H1/0808 ,  G03H1/0005 ,  G03H1/22 ,  G03H1/2294 ,  G03H1/268 ,  G03H1/32 ,  G03H2001/0088 ,  G03H2001/0816 ,  G03H2001/0858 ,  G03H2001/2236 ,  G03H2001/2242 ,  G03H2001/2263 ,  G03H2001/2271 ,  G03H2001/269 ,  G03H2001/303 ,  G03H2210/30 ,  G03H2210/33 ,  G03H2210/454 ,  G03H2222/34 ,  G03H2223/16 ,  G03H2225/35 ,  G03H2226/02 ,  G03H2226/05

Abstract: A method of computing a hologram by determining the wavefronts at the approximate observer eye position that would be generated by a real version of an object to be reconstructed. In normal computer generated holograms, one determines the wavefronts needed to reconstruct an object; this is not done directly in the present invention. Instead, one determines the wavefronts at an observer window that would be generated by a real object located at the same position of the reconstructed object. One can then back-transforms these wavefronts to the hologram to determine how the hologram needs to be encoded to generate these wavefronts. A suitably encoded hologram can then generate a reconstruction of the three-dimensional scene that can be observed by placing one's eyes at the plane of the observer window and looking through the observer window.

公开(公告)号：US09709953B2

公开(公告)日：2017-07-18

申请号：US14418956

申请日：2013-07-30

Applicant: Real View Imaging Ltd.

Inventor： Shlomo Alon-Braitbart ,  Shaul Alexander Gelman ,  Carmel Rotschild

IPC: G03H1/32 ,  G03H1/22

CPC classification number: G03H1/32 ,  G02B27/0093 ,  G03H1/2205 ,  G03H1/2249 ,  G03H1/2294 ,  G03H1/26 ,  G03H1/30 ,  G03H2001/0216 ,  G03H2001/0816 ,  G03H2001/2236 ,  G03H2001/2239 ,  G03H2001/2242 ,  G03H2001/2271 ,  G03H2001/2292 ,  G03H2001/2297 ,  G03H2001/2605 ,  G03H2001/262 ,  G03H2210/30 ,  G03H2210/36 ,  G03H2222/18 ,  G03H2222/33 ,  G03H2223/18 ,  G03H2223/19 ,  G03H2223/24 ,  G03H2226/05 ,  G03H2227/03 ,  G03H2240/50

Abstract: A method for despeckling the image reproduced by a Computer Generated Hologram (CGH) including reproducing a CGH, and jittering a location of an exit pupil of an optical system through which the CGH is imaged, relative to an observer's input pupil, so as to shift at least some speckles out of the exit pupil. A method for despeckling a Computer Generated Holographic image including computing a first modulation for a first holographic image, and computing a second modulation for a second holographic image of a same holographic image using an initial phase distribution used for calculating the first holographic image as an initial phase distribution used for calculating the second modulation. Related apparatus and methods are also described.

公开(公告)号：US20160266545A1

公开(公告)日：2016-09-15

申请号：US15162971

申请日：2016-05-24

Applicant: Dai Nippon Printing Co., Ltd.

Inventor： Makio KURASHIGE ,  Kazutoshi ISHIDA ,  Tomoe TAKANOKURA ,  Yasuyuki OOYAGI

IPC: G03H1/26 ,  G03H1/32 ,  G03H1/22

CPC classification number: G03H1/265 ,  G02B5/32 ,  G02B26/101 ,  G02B27/48 ,  G03B21/2033 ,  G03B33/06 ,  G03H1/0005 ,  G03H1/22 ,  G03H1/2202 ,  G03H1/2249 ,  G03H1/2286 ,  G03H1/32 ,  G03H2001/2231 ,  G03H2001/2263 ,  G03H2001/2271 ,  G03H2001/2292 ,  G03H2001/266 ,  G03H2222/36 ,  H04N9/3129 ,  H04N9/3161

Abstract: An optical device including a hologram recording medium that can reproduce an image of a reference member and an irradiation unit that emits a coherent light beam to the optical device. The irradiation unit includes a light source for emitting a coherent light beam and a scanning device capable of adjusting a reflection angle of the coherent light beam emitted from the light source and that makes a reflected coherent light beam scan the hologram recording medium. The light source has light sources for emitting coherent light beams having different wavelength ranges. The hologram recording medium has a plurality of recording areas to be scanned with a plurality of coherent light beams reflected by the scanning device, respectively. Each of the plurality of recording areas has an interference fringe that diffracts a coherent light beam of the corresponding wavelength range.

Abstract translation: 一种光学装置，包括可以再现参考构件的图像的全息图记录介质和向该光学装置发射相干光束的照射单元。 照射单元包括用于发射相干光束的光源和能够调节从光源发射的相干光束的反射角并使反射的相干光束扫描全息图记录介质的扫描装置。 光源具有用于发射具有不同波长范围的相干光束的光源。 全息图记录介质具有分别由扫描装置反射的多个相干光束扫描的多个记录区域。 多个记录区域中的每一个具有衍射相应波长范围的相干光束的干涉条纹。