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公开(公告)号：US11966197B2
公开(公告)日：2024-04-23
申请号：US17092606
申请日：2020-11-09
申请人： Envisics Ltd
发明人： Jamieson Christmas
IPC分类号： G03H1/22
CPC分类号： G03H1/2294 , G03H1/2202
摘要： There is provided a lighting system for a vehicle. The lighting system comprises a holographic projector and a light distribution system. The holographic projector comprises a hologram engine and a spatial light modulator. The hologram engine is arranged to output holograms. The spatial light modulator is arranged to display each hologram and spatially-modulate light in accordance with each hologram. The spatially-modulated light forms a holographic reconstruction, corresponding to each hologram, on a replay plane. The light distribution system comprises a plurality of optical fibres. Each optical fibre comprises an input optically-coupled to respective sub-area of the replay plane and an output optically coupled with an illumination sub-system of the vehicle.
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公开(公告)号：US11947127B2
公开(公告)日：2024-04-02
申请号：US17721836
申请日：2022-04-15
申请人： ENVISICS LTD
发明人： Mate Karner , Jamieson Christmas
CPC分类号： G02B27/0179 , B60K35/00 , G02B27/0101 , B60K35/23 , G02B27/0103 , G02B2027/0105 , G02B2027/0109 , G02B2027/0127 , G02B2027/014 , G02B2027/0145 , G02B2027/0185 , G02B2027/0196
摘要： A head-up display for a vehicle having a window. The head-up display comprises a picture generating unit and a projection engine. The picture generating unit is arranged to output pictures. Each picture comprises a first picture component and a second picture component. The projection engine is arranged to receive the pictures output by the picture generating unit and project the pictures onto the window of the vehicle in order to form a first virtual image of the first picture component at a first virtual image distance and a second virtual image of the second picture component at a second virtual image distance. Light of the first picture component is polarised in a first polarisation direction and light of the second picture component is polarised in a second polarisation direction perpendicular to the first polarisation direction. The projection engine comprises an optical element having first optical power in the first polarisation direction and second optical power in the second polarisation direction such that the first virtual image distance is not equal to the second virtual image distance. The projection engine is further arranged such that the first virtual image and second virtual image at least partially overlap.
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公开(公告)号：US20240077833A1
公开(公告)日：2024-03-07
申请号：US18259182
申请日：2022-03-08
申请人： Envisics Ltd
CPC分类号： G03H1/0005 , G03H1/02 , G03H1/2645 , G03H2001/0088 , G03H2001/0224 , G03H2001/2655 , G03H2225/12 , G03H2225/22
摘要： A liquid crystal display device and corresponding method to display a hologram is described. A grey level value for each pixel of a hologram is received and a pixel voltage based on grey level for each pixel of the hologram is determined. The pixels of the display device are driven in accordance with a first representation of the pixel voltages during at least one first drive event. The pixels of the display device are driven in accordance a second representation of the pixel voltages during at least one second drive event after the at least one first drive event. The first representation may be an n-bit representation and the second representation may be a m-bit representation and n
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公开(公告)号：US11874631B2
公开(公告)日：2024-01-16
申请号：US17119709
申请日：2020-12-11
申请人： Envisics Ltd
CPC分类号： G03H1/30 , G02B27/01 , G02B27/0103 , G02B27/0172 , G03H1/22 , G03H1/2205 , G03H1/2286 , G03H1/2294 , G03H1/26 , G06T5/006 , G06T7/33 , G02B2027/0112 , G03H2001/0825 , G03H2001/2218 , G03H2001/2244 , G03H2001/2263 , G03H2001/2297 , G03H2001/303 , G03H2222/18 , G03H2223/55 , G03H2225/22 , G03H2225/23 , G03H2225/61 , G03H2226/02 , G03H2250/38 , G06T2207/10024
摘要： A method of holographic projection includes projecting at least one calibration image. The method includes performing the following steps for each calibration image in order to determine a plurality of displacements vectors at a respective plurality of different locations on the replay plane: projecting the calibration image onto the replay plane using a first colour holographic channel by displaying a first hologram on a first spatial light modulator and illuminating the first spatial light modulator with light of the first colour; projecting the calibration image onto the replay using a second colour holographic channel by displaying a second hologram on a second spatial light modulator and illuminating the second spatial light modulator with light of the second colour, the first and second hologram corresponding to the calibration image; determining the displacement vector between the light spot formed by the first colour holographic channel and the light spot formed by the second colour holographic channel; and pre-processing an image for projection using the second colour holographic channel in accordance with the plurality of determined displacement vectors.
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公开(公告)号：US20230367115A1
公开(公告)日：2023-11-16
申请号：US18306090
申请日：2023-04-24
申请人： Envisics Ltd
CPC分类号： G02B27/0081 , G02B27/0103 , G02B6/262 , G02B2027/0123
摘要： A pupil expander for a head-up display. The head-up display has an eye-box having a first dimension and second dimension. The pupil expander comprises a pair of first waveguides each arranged to replicate a pupil in the first dimension of the eye-box. Each waveguide is elongated and tapered in the direction of elongation such that its input end is narrower than its output end. The first waveguides are arranged so that their input ends are substantially proximate each other and their respective output ends are substantially distal from each other.
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公开(公告)号：US11782133B2
公开(公告)日：2023-10-10
申请号：US16479464
申请日：2018-01-19
申请人： Envisics Ltd.
发明人： Jamieson Christmas
IPC分类号： G01S7/481 , G01S17/42 , G01S17/931 , G01S17/89 , G01S7/484
CPC分类号： G01S7/4814 , G01S7/4815 , G01S7/4817 , G01S17/42 , G01S17/89 , G01S17/931 , G01S7/484
摘要： A light detection and ranging system arranged to scan a scene comprises a light source arranged to output light having a first characteristic. A spatial light modulator is arranged to receive the light from the light source and output spatially-modulated light in accordance with computer-generated holograms represented thereon. A holographic controller is arranged to output a plurality of holograms to the spatial light modulator. Each hologram is arranged to form a corresponding light footprint within the scene. The holographic controller is further arranged to change the position of the light footprint within the scene. A light detector is arranged to receive light having the first characteristic from the scene and output a light response signal. In embodiments, a first plurality of holograms are arranged to provide a first scan within the scene, and the holographic controller is arranged to receive the light response signal in response to the first scan and determine a second plurality of holograms based on a property of the light response signal.
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公开(公告)号：US20230266712A1
公开(公告)日：2023-08-24
申请号：US18005458
申请日：2021-06-07
申请人： Envisics Ltd
发明人： Abdullah Asmari , Timothy Smeeton
IPC分类号： G03H1/22 , G01S17/894
CPC分类号： G03H1/2294 , G01S17/894 , G03H2001/306
摘要： A method for light detection and ranging comprises a forming a first light pattern within a region of a scene by holographic projection. The first light pattern comprises n light spots arranged in a regular array. A light return signal is received from each light detection element of an array of light detection elements directed at the region of the scene. The intensity of the light return signals is assessed. If the light return signals do not meet at least one signal validation criterion, a second light pattern is formed within the region of the scene by holographic projection. The second light pattern comprises m light spots arranged in a regular array, wherein m ≠ n. A time-of-flight in association with each light spot of the second light pattern is then determined.
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公开(公告)号：US20230188688A1
公开(公告)日：2023-06-15
申请号：US17938169
申请日：2022-10-05
申请人： Envisics Ltd
发明人： Daniel Burnham , Timothy Smeeton
CPC分类号： H04N9/3182 , G03H1/2294 , G03H1/2202 , G03H1/2286 , H04N9/3138 , G06T7/90 , H04N9/3141 , G02F1/136277
摘要： A projection system arranged to receive an image for projection. The image is a colour image comprising a first colour component and a second colour component. The system is arranged to calculate a first hologram of the first colour component and a second hologram of the second colour component. The system is further arranged to add content of the second colour component to the first colour component before calculating the first hologram. The first hologram contains information of the first colour component and information of at least a portion of the second colour component. The system is further arranged to form a first holographic reconstruction by illuminating the first hologram with first colour light and to form a second holographic reconstruction by illuminating the second hologram with second colour light. The first holographic reconstruction changes the chromaticity of the at least a portion of the second colour component.
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公开(公告)号：US20230064690A1
公开(公告)日：2023-03-02
申请号：US17867513
申请日：2022-07-18
申请人： Envisics Ltd
摘要： Systems and methods of determining a hologram of an image for a system comprising a display device and viewing system are disclosed. Some embodiments implement a multi-stage procedure comprising (i) determining a first complex light field at an entrance pupil of the viewing system, (ii) determining a second complex light field at a sensor plane of a sensor of the viewing system, (iii) determining a third complex light field at the entrance pupil, and (iv) determining a fourth complex light field at the display plane. Some embodiments include extracting a hologram from a data set corresponding to the fourth complex light field.
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公开(公告)号：US11592664B2
公开(公告)日：2023-02-28
申请号：US17034776
申请日：2020-09-28
申请人： Envisics Ltd
发明人： Jamieson Christmas
摘要： There is disclosed herein a display device comprising a picture generating unit, a waveguide pupil expander and a viewer-tracking system. The picture generating unit comprises a first display channel, a second display channel and a controller. The first display channel is arranged to output first spatially-modulated light of a first colour. The first spatially-modulated light corresponds to a first picture. The second display channel is arranged to output second spatially-modulated light of a second colour. The second spatially-modulated light corresponding to a second picture. The controller is arranged to drive the first display channel and second display channel. The waveguide pupil expander comprises a pair of parallel reflective surfaces. The waveguide pupil expander defines an input port and a viewing window. The input port is arranged to receive the first spatially-modulated light and the second spatially-modulated light. The viewing window is an area or volume within which a viewer may view the first picture and the second picture. The pair of parallel reflective surfaces is arranged to guide the first spatially-modulated light and the second spatially-modulated light from the input port to the viewing window by a series of internal reflections. The reflectivity of a first reflective surface of the pair of parallel reflective surfaces is provided by a graded coating. The graded coating is partially transmissive to light of the first colour and light of the second colour. The transmissivity of the graded coating is non-achromatic. The viewer-tracking system is arranged to determine a viewing position within the viewing window. The controller is arranged to maintain as substantially constant the colour balance of the first and second picture as seen from the viewing position based on the viewing position determined by the viewer-tracking system.
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