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公开(公告)号：US11754972B2
公开(公告)日：2023-09-12
申请号：US16071096
申请日：2017-01-18
CPC分类号： G03H1/0808 , G03H1/16 , G03H1/32 , G06T9/00 , G03H2001/0816
摘要： 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.
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公开(公告)号：US11409242B2
公开(公告)日：2022-08-09
申请号：US16051945
申请日：2018-08-01
申请人： Dualitas Ltd.
发明人： Jamieson Christmas , Alexander Cole
摘要： 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.
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公开(公告)号：US11119261B1
公开(公告)日：2021-09-14
申请号：US16144390
申请日：2018-09-27
摘要： Systems and methods for performing coherent diffraction in an optical device are disclosed. An optical device may include a grating medium with a first hologram having a first grating frequency. A second hologram at least partially overlapping the first hologram may be provided in the grating medium. The second hologram may have a second grating frequency that is different from the first grating frequency. The first and second holograms may be pair-wise coherent with each other. A manufacturing system may be provided that writes the pair-wise coherent holograms in a grating medium using a signal beam and a reference beam. Periscopes may redirect portions of the signal and reference beams towards a partial reflector, which combines the beams and provides the combined beam to a detector. A controller may adjust an effective path length difference between the signal and reference beams based on a measured interference pattern.
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公开(公告)号：US20210279951A1
公开(公告)日：2021-09-09
申请号：US17191969
申请日：2021-03-04
发明人： Min Sung YOON , Soo Myung PARK
摘要： A method of generating hologram data in a holographic display apparatus, including a hologram processing device generating hologram data and a display terminal reconstructing a hologram image in a three-dimensional (3D) space on the basis of the generated hologram data, includes generating depth map image data from input image data by using a deep learning engine for generating a depth map and calculating a complex value hologram on the basis of the depth map image data and the input image data to generate the hologram data.
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公开(公告)号：US20210216041A1
公开(公告)日：2021-07-15
申请号：US17056249
申请日：2019-06-10
申请人： Dualitas Ltd
发明人： Jamieson Christmas , Niall McGee
摘要： There is provided a holographic projector comprising a processing engine, spatial light modulator (403B), light source (401B) and light-receiving surface (405B). The processing engine outputs a computer-generated diffractive pattern defining a propagation distance to an image plane. The spatial light modulator displays the computer-generated diffractive pattern. The light source illuminates the spatial light modulator at an angle of incidence (theta) greater than zero. The light-receiving surface receives spatially-modulated light from the spatial light modulator. The light-receiving surface is substantially parallel to the spatial light modulator (alpha-theta). The light-receiving surface is separated from the spatial light modulator by the propagation distance defined by the computer-generated diffractive pattern
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公开(公告)号：US20210208535A1
公开(公告)日：2021-07-08
申请号：US16825571
申请日：2020-03-20
发明人： Gi Hyeon MIN , Keo Sik KIM , Hyun Seo KANG , Kye Eun KIM , Sung Chang KIM , Ji Hyoung RYU , Si Woong PARK , Hyoung Jun PARK , Dong Hoon SON , Chan Il YEO , Dong Soo LEE , Byung Tak LEE , Young Soon HEO
摘要： Provided are a system and method for digital holographic imaging which are not affected by external vibrations. The system for digital holographic imaging includes a light source and optical system section configured to split generated beams and including a sample through which the beams pass, a lens, and a grating disposed behind the lens; an object signal acquisition section configured to receive the split beams and acquire an interference signal; and an image processor configured to acquire a three-dimensional (3D) image of an object by using the acquired interference signal.
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7.发明申请公开(公告)号：US20210149339A1
公开(公告)日：2021-05-20
申请号：US16950481
申请日：2020-11-17
发明人： Han-Ju YEOM , Sanghoon CHEON , Joongki PARK , Kwan-Jung OH , Keehoon HONG
摘要： An apparatus for synthesizing ultra-high resolution computer generated holograms based on mesh propagates a plurality of 3D meshes constituting the 3D model to a hologram plane, divides an entire angular spectrum area corresponding to a set maximum diffraction angle into a plurality of partial angular spectral areas, sequentially calculates and accumulates angular spectrums of the plurality of 3D meshes for each of the plurality of partial angular spectrum areas, and generates holograms for the 3D model from the angular spectrums accumulated for each of the plurality of partial angular spectrum areas.
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公开(公告)号：US10928645B2
公开(公告)日：2021-02-23
申请号：US16249434
申请日：2019-01-16
发明人： Yuntae Kim , Geeyoung Sung , Changkun Lee , Hongseok Lee
摘要： A three-dimensional (3D) image display apparatus includes a processor configured to determine, from image data of a 3D image to be displayed, a representative depth value based on a current frame of the 3D image and a previous frame of the 3D image, and an imaging optical system configured to generate the 3D image in a predetermined space by modulating light based on the representative depth value.
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公开(公告)号：US20200026077A1
公开(公告)日：2020-01-23
申请号：US16517082
申请日：2019-07-19
申请人： Envisics Ltd
发明人： Jamieson Christmas , Máté Karner
摘要： There is provided a head-up display for a vehicle. The head-up display has a first housing and a second housing. The first housing comprises a picture generating unit and optical system. The second housing comprises a substantially flat cover glass and a layer. The picture generating unit is arranged to output pictures. The picture generating unit comprises a light source and a spatial light modulator. The light source is arranged to emit light. The spatial light modulator is arranged to receive the light from the light source and spatially-modulate the light in accordance with computer-generated light-modulation patterns displayed on the spatial light modulator to form a holographic reconstruction corresponding to each picture. The optical system is arranged to receive the pictures output by the picture generating unit and relay the pictures using an optical combiner to form a virtual image of each picture. The optical combiner combines light output by the picture generating unit with light from a real-world scene to present combined images to a viewer within an eye-box. The second housing is disposed between the first housing and optical combiner. The substantially flat cover glass is arranged to protect the first housing. The layer is arranged to change the trajectory of light such that any sunlight reflected by the cover glass is deflected away from the eye-box.
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公开(公告)号：US10481554B2
公开(公告)日：2019-11-19
申请号：US15851689
申请日：2017-12-21
申请人： Dualitas Ltd.
摘要： There is provided a near-eye device for augmenting a real world view. The near-eye device comprises a spatial light modulator comprising an array of phase modulating elements arranged to apply a phase delay distribution to incident light. The device further comprises a beam combiner comprising a first optical input arranged to receive spatially modulated light from the spatial light modulator and a second optical input having a field of view of the real world.
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