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公开(公告)号：US20230315015A1
公开(公告)日：2023-10-05
申请号：US18160244
申请日：2023-01-26
申请人： Envisics Ltd
发明人： Jamieson Christmas , Ahsan Memon , Timothy Smeeton
IPC分类号： G03H1/30
CPC分类号： G03H1/30 , G03H2001/303 , G03H2226/02
摘要： A method of projecting a first image and a second image using one multi-wavelength hologram. The first image is different to the second image. The multi-wavelength hologram is arranged for illumination by light of a first wavelength to project the first image. The multi-wavelength hologram is further arranged for illumination by light of a second, shorter wavelength to project the second image.
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公开(公告)号：US20230266711A1
公开(公告)日：2023-08-24
申请号：US18005457
申请日：2021-06-21
申请人： Envisics Ltd
发明人： Timothy Smeeton , Abdullah Asmari , Gavin Fowler
CPC分类号： G03H1/2294 , G03H1/0808 , G03H2001/2297
摘要： A LIDAR system for scene surveying comprises a spatial light modulator for displaying a diffractive pattern comprising a hologram of a light footprint, and a light source for illuminating the diffractive pattern to form a holographic reconstruction of the light footprint on a holographic replay plane in the scene. The light footprint comprises an array of light features. The system comprises a display driver for controlling the spatial light modulator and changing the diffractive pattern with time. The diffractive pattern is changed with time such that each light feature of the array of light features scans a respective sub-area of the scene. The system comprises a detection system having a plurality of light detecting elements and that is configured such that each light detecting element detects light from a respective individual field of view within the scene. Each sub-area of the scene contains a plurality of individual fields of view.
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公开(公告)号：US20230266447A1
公开(公告)日：2023-08-24
申请号：US18005459
申请日：2021-07-06
申请人： Envisics Ltd
CPC分类号： G01S7/487 , G01S7/4816 , G03H1/2294 , G03H1/0005 , G03H1/2202 , G03H2226/11 , G03H2001/0033
摘要： A LIDAR system comprises a spatial light modulator for displaying a diffractive pattern comprising a hologram of a structured light pattern that is projected onto a scene. The structured light pattern comprises an array of light spots and a light source for illuminating the diffractive pattern to form a holographic reconstruction of the light pattern. A detection subsystem comprises light detection elements that detect light from a respective individual field of view (FOV) of the scene and output a respective detected light signal. A first subset of the individual FOVs are illuminated by a light spot of the light pattern and a second subset are not illuminated by the light spot. The system comprises a processor for identifying noise in a first detected light signal, relating to an individual FOV of the first subset, using a second detected light signal, relating to an individual FOV of the second subset.
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公开(公告)号：US20230090648A1
公开(公告)日：2023-03-23
申请号：US17931738
申请日：2022-09-13
申请人： Envisics Ltd
IPC分类号： G02B27/01
摘要： Disclosed embodiments include a head-up display for a vehicle comprising a first pupil replicator and second pupil replicator. The first pupil replicator extends in a first direction. The first pupil replicator is arranged to receive a holographic light field from a spatial light modulator having a pixel array defining a limiting aperture of the head-up display. A holographic light field is a complex light field spatially modulated in accordance with a hologram displayed on the spatial light modulator. The second pupil replicator extends in the first direction and in a second direction perpendicular to the first direction. The second pupil replicator comprises a first major surface forming an output and a second major surface parallel to the first major surface. The first pupil replicator is arranged within a planar layer substantially parallel and adjacent to the second major surface of the second pupil replicator.
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公开(公告)号：US20230060564A1
公开(公告)日：2023-03-02
申请号：US17859413
申请日：2022-07-07
申请人： Envisics Ltd
IPC分类号： G03H1/26
摘要： Systems and method disclosed herein include, among other features, receiving an image for display within a display area of a display system, determining a first image component of the image, calculating a hologram of the image, displaying the hologram on a display device and spatially modulating light in accordance with the displayed hologram, and propagating the spatially modulated light through a pupil expander arranged to provide a plurality of different light propagation paths for the spatially modulated light from the display device to the viewing area, wherein each light propagation path corresponds to a respective continuous region of the image owing to the angular distribution of light from the hologram.
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公开(公告)号：US20220236562A1
公开(公告)日：2022-07-28
申请号：US17719100
申请日：2022-04-12
申请人： ENVISICS LTD
发明人： Alexander Cole
IPC分类号： G02B27/01
摘要： A display device having a viewing window on a viewing plane is described. The display device comprises a picture generating unit, a first waveguide pupil expander and a second waveguide pupil expander. The picture generating unit is arranged to display a picture on a display plane. The picture is a holographic reconstruction formed from a hologram of the picture. The first waveguide pupil expander comprises an input port arranged to receive light of the picture and to expand a first exit pupil thereof in a first dimension. The second waveguide pupil expander comprises an input port arranged to receive light of the picture and to expand a second exit pupil thereof in the first dimension. The first dimension corresponds to a dimension of the viewing window. A method of expanding a viewing window of a display device is also described.
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公开(公告)号：US11275243B2
公开(公告)日：2022-03-15
申请号：US16549606
申请日：2019-08-23
摘要： A replicator assembly includes reflective, transmissive, and transparent elements. The reflective element receives and reflects a hologram of a HUD system. The transmissive element includes a partially transmissive portion that receives a reflection of the hologram from the reflective element, outputs N replications of the hologram, and reflects N−1 replications of the hologram. The partially transmissive portion is implemented as a continuous transmission neutral density filter across different phase regions. The phase regions of the partially transmissive portion correspond respectively to the N replications. N is an integer greater than or equal to 2. The reflective element reflects the N−1 replications of the hologram. The transparent element is disposed between the reflective and transmissive elements and guides the N replications of the hologram between the reflective and transmissive elements. The reflective, transmissive and transparent elements are implemented as a replicator and collectively provide the N replications of the hologram.
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公开(公告)号：US20220075317A1
公开(公告)日：2022-03-10
申请号：US17461362
申请日：2021-08-30
申请人： ENVISICS LTD
发明人： Alexander Cole
IPC分类号： G03H1/22
摘要： A projector arranged to project an image within a display area on a display plane. The image comprises a light feature. A light sensor is spatially separated from the display plane. In an aligned state, light forming the light feature of the image on the display plane is at least partially disposed around the light sensor. In the aligned state, substantially no light forming the light feature impinges on the light sensor. The aligned state defines a selected alignment between the display area and the display plane (i.e. a selected position of the display area on the display plane).
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公开(公告)号：US20210286319A1
公开(公告)日：2021-09-16
申请号：US17320516
申请日：2021-05-14
申请人： Envisics Ltd
发明人： Alexander Cole
IPC分类号： G03H1/22 , G01S17/88 , G01S7/4865
摘要： A light detection and ranging, “LiDAR”, system arranged to make time of flight measurements of a scene. The LiDAR system comprises a holographic projector comprising: a spatial light modulator arranged to display light modulation patterns, each light modulation pattern comprising a hologram and a grating function having a periodicity; a light source arranged to illuminate each displayed light modulation pattern in turn; and a projection lens arranged to receive spatially modulated light from the spatial light modulator and project a structured light pattern corresponding to each hologram onto a respective replay plane. The LiDAR system further comprises a system controller arranged to receive distance information related to the scene and output to the holographic projector a control signal corresponding to the distance information. The holographic projector is arranged to use the control signal to determine a parameter for projection of a subsequent structured light pattern.
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公开(公告)号：US20210255459A1
公开(公告)日：2021-08-19
申请号：US17179152
申请日：2021-02-18
申请人： Envisics Ltd
发明人： Jamieson Christmas
摘要： There is disclosed herein a waveguide comprising an optical slab and an optical wedge. The optical slab has a first refractive index, n1>1. The optical slab comprises: a pair of opposing surfaces and an input port. The pair of opposing surfaces are arranged in a parallel configuration. The input port is arranged to receive light into the optical slab at an angle such that the light is guided between the first and second opposing surfaces by a series of internal reflections. The optical wedge has a second refractive index, n2, wherein 1
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