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公开(公告)号：US12126944B2
公开(公告)日：2024-10-22
申请号：US18204303
申请日：2023-05-31
申请人： Dualitas Ltd
CPC分类号： H04N9/3179 , G03H1/28 , G03H1/30 , H04N9/3141 , G03H2001/303 , G03H2225/12 , G03H2226/02
摘要： A holographic projector comprises an image processing engine, a hologram engine, a display engine and a light source. The image processing engine is arranged to receive a source image for projection and generate a plurality of secondary images from a primary image based on the source image. The source image comprises pixels. Each secondary image may comprise fewer pixels than the source image. The plurality of secondary images are generated by sampling the primary image. The hologram engine is arranged to determine, such as calculate, a hologram corresponding to each secondary image to form a plurality of holograms. The display engine is arranged to display each hologram on the display device. The light source is arranged to Illuminate each hologram during display to form a holographic reconstruction corresponding to each secondary image on a replay plane. The primary image is selected from the group comprising: the source image and an intermediate image.
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公开(公告)号：US11736667B2
公开(公告)日：2023-08-22
申请号：US17119715
申请日：2020-12-11
申请人： Dualitas Ltd
发明人： Jamieson Christmas
CPC分类号： H04N9/3105 , G02B27/0103 , G02B2027/0105 , G02B2027/0109
摘要： A projector arranged to form a plurality of image reconstructions on different planes disposed on a common projection axis and a corresponding method is disclosed. A hologram engine is arranged to determine a hologram corresponding to each image for image reconstruction, and to form a diffractive pattern including the corresponding hologram for each image. A display engine is arranged to display each diffractive pattern and receive light such that an image reconstruction corresponding to each hologram is formed on a plane of the plurality of different planes. Each image reconstruction comprises image spots arranged in a pattern. Image spots of a first image reconstruction formed on a first plane are interposed between image spots of a second image reconstruction formed on a second plane.
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公开(公告)号：US11640138B2
公开(公告)日：2023-05-02
申请号：US16665194
申请日：2019-10-28
申请人： Dualitas Ltd
发明人： Jamieson Christmas
IPC分类号： G03H1/22
摘要： A holographic image generation system including a spatial light modulator; a light source; a temporal modulator; a light sensor and a demodulator. The spatial light modulator has pixels. The light source illuminates the spatial light modulator. The temporal light modulator modulates an output intensity of the light source over time to encode holographic data representing a hologram. The light sensor is associated with a spatial light modulator and receives light from the light source and generates a signal representative of the output intensity of the light source. The demodulator is connected to the light sensor to receive the signal. The demodulator decodes the signal to obtain the holographic data. The demodulator is connected to the spatial light modulator to set the pixels of the spatial light modulator in accordance with the holographic data to display the hologram ready for illumination by the light source to form a holographic reconstruction.
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公开(公告)号：US11307534B2
公开(公告)日：2022-04-19
申请号：US16603531
申请日：2017-10-27
申请人： DUALITAS LTD.
发明人： Jamieson Christmas
IPC分类号： G03H1/22
摘要： There is provided a holographic projection system arranged to project light to a rectangular replay field. The holographic projection system comprises: a spatial light modulator, comprising an array of pixels, arranged to receive a computer-generated hologram and output spatially-modulated light forming a holographic reconstruction at the rectangular replay field, wherein each pixel is rectangular; and a light source arranged to illuminate the plurality of pixels to form the spatially-modulated light forming a holographic reconstruction at the replay field, wherein the rectangular replay field is spatially separated from the spatial light modulator and the aspect ratio of the rectangular replay field is substantially equal to the aspect ratio of each pixel but orthogonally orientated.
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公开(公告)号：US20220057751A1
公开(公告)日：2022-02-24
申请号：US17410586
申请日：2021-08-24
申请人： DUALITAS LTD
发明人： Jamieson Christmas
摘要： Methods of performing a complex Fourier transform of a complex data set corresponding to an image are disclosed. The methods comprise receiving a complex data set and performing a first 1D complex Fourier transform in the complex data set in Cartesian form; converting the complex data set into polar form and compressing the complex data set in polar form; performing a row-column transformation of the complex data set; decompressing the complex data set and converting the complex data set back into Cartesian form; and performing a second 1D Fourier transform in the complex data set in Cartesian form, wherein the second 1D complex Fourier transform is orthogonal to the first 1D complex Fourier transform. Corresponding systems are also disclosed, as are application to the iterative computation of computer-generated holograms.
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公开(公告)号：US20210302911A1
公开(公告)日：2021-09-30
申请号：US17209747
申请日：2021-03-23
申请人： Dualitas Ltd
发明人： Jamieson Christmas
摘要： There is disclosed herein an image projector arranged to project an image onto a display plane. The image projector comprises a processing engine, a display device, an optical element and a light source. The processing engine is arranged to output a computer-generated diffractive pattern comprising a hologram of an image for projection and a lens function corresponding to a lens having a first optical power. The display device is arranged to display the computer-generated diffractive pattern. The optical element is disposed between the display device to the display plane. The optical element has second optical power. The light source is arranged to provide off-axis illumination of the display device in order to spatially-modulated light in accordance with the hologram and lens function. The lens function of the computer-generated diffractive pattern and the optical element collectively perform a hologram transform of the hologram such that a reconstruction of the image is formed on the display plane. The display device is tilted with respect to the optical element by a first angle greater than zero. The display plane is tilted with respect to the optical element by a second angle greater than zero. The second angle is less than the first angle.
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公开(公告)号：US10976703B2
公开(公告)日：2021-04-13
申请号：US15739113
申请日：2016-12-22
申请人： Dualitas Ltd
发明人： Brian Mullins
IPC分类号： G03H1/00 , B29C64/227 , B29C64/273 , G03H1/04 , G03H1/22 , B33Y50/00 , G03H1/02
摘要： A printing device (106) includes a laser source and a LCOS-SLM (Liquid Crystal on Silicon Spatial Light Modulator). The printing device generates a laser control signal and a LCOS-SLM control signal. The laser source (110) generates a plurality of incident laser beams based on the laser control signal. The LCOS-SLM (112) receives the plurality of incident laser beams, modulates the plurality of incident laser beams based on the LCOS-SLM control signal to generate a plurality of holographic wavefronts (214,216) from the modulated plurality of incident laser beams. Each holographic wavefront forms at least one corresponding focal point. The printing device cures a surface layer or sub-surface layer (406) of a target material (206) at interference points of focal points of the plurality of holographic wavefronts. The cured surface layer of the target material forms a three-dimensional printed content.
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公开(公告)号：US20210055691A1
公开(公告)日：2021-02-25
申请号：US17000952
申请日：2020-08-24
申请人： Dualitas Ltd
发明人： Michal Wengierow , Mikael Collin , Sahar Chowdhury
摘要： A holographic projector comprises an image processing engine, a hologram engine, a display engine and a light source. The image processing engine is arranged to receive a source image for projection and generate a plurality of secondary images from the source image. The source image comprises pixels. Each secondary image comprises fewer pixels than the source image. A first secondary image has more pixels that a second secondary image. The hologram engine is arranged to determine, such as calculate, a hologram corresponding to each secondary image to form a plurality of holograms. Thus, a first hologram corresponding to the first secondary image has more pixels than a second hologram corresponding to the second secondary image. The display engine is arranged to display each hologram in turn on the display device. The light source is arranged to Illuminate each hologram during display to form a holographic reconstruction corresponding to each secondary image on a replay plane.
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公开(公告)号：US20200166890A1
公开(公告)日：2020-05-28
申请号：US16665174
申请日：2019-10-28
申请人： Dualitas Ltd
发明人： Neil Collings , Jamieson Christmas
摘要： A holographic display method includes calculating a hologram, displaying it on a spatial light modulator (SLM) and illuminating it with coherent light. The hologram includes hologram pixels each having a hologram pixel value. The hologram is calculated using steps including: performing the inverse Fourier transform of the product of an object field and a negative quadratic phase exponential representative of positive optical power; and restricting each calculated hologram pixel value to one of a plurality (greater than two) of allowable pixel values to form a constrained hologram, which is displayed on the SLM. Each light-modulating pixel of the SLM is operable in a plurality of light-modulation levels corresponding to the plurality of allowable pixel values. The SLM is illuminated with coherent light to form a replay field including conjugate images: a real holographic reconstruction and a virtual holographic reconstruction having greater intensity than that of the real holographic reconstruction.
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公开(公告)号：US20200150590A1
公开(公告)日：2020-05-14
申请号：US16680282
申请日：2019-11-11
申请人： Dualitas Ltd
发明人： Jamieson Christmas
摘要： There is provided a spatial light modulator arranged to display a light modulation pattern comprising a hologram. The spatial light modulator comprises a liquid crystal on silicon spatial light modulator having a plurality of pixels. The hologram has a plurality of pixels. The spatial light modulator comprises a silicon backplane. Each pixel of the spatial light modulator comprises a light-modulating element and a respective pixel circuit. Each pixel circuit is embedded in the silicon backplane. Each pixel circuit is arranged to drive the corresponding light-modulating element. Each pixel circuit is further arranged to combine a received pixel value of the hologram with a corresponding pixel value of the light processing function such that the light modulation pattern further comprises the light processing function. The light processing function comprises a lens function and/or a grating function.
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