公开(公告)号：US20200326464A1

公开(公告)日：2020-10-15

申请号：US16843544

申请日：2020-04-08

申请人： Dualitas Ltd.

发明人： Ricardo Gomes ,  Pedro Moreira ,  Alexander Cole

IPC分类号： G02B5/32 ,  G02B5/02

摘要： There is described herein a diffuser assembly comprising a leaf spring, diffuser and at least one actuator. The leaf spring is arranged as a rectangular frame having a width, x, and height, y. The diffuser is suspended by the frame such as within the frame. The at least one actuator arranged to move, such as translate, the diffuser. The assembly is arranged such that the leaf spring provides in-plane (x-y plane) stiffness, kx and ky, less than the out-of-plane (z-direction) stiffness, kz.

公开(公告)号：US10802440B2

公开(公告)日：2020-10-13

申请号：US15739116

申请日：2016-12-22

申请人： Dualitas Ltd.

发明人： Brian Mullins

IPC分类号： G03H1/00 ,  B29C64/264 ,  B29C64/386 ,  B29C64/10 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02 ,  B29C64/393 ,  B29C64/268 ,  B33Y50/00 ,  G03H1/22 ,  B29C64/153

摘要： A printing device (106) includes a dynamic holography printing application configured to generate a laser control signal and a LCOS-SLM (Liquid Crystal on Silicon Spatial Light Modulator) control signal based on a two-dimensional content corresponding to a lithography mask. A laser source (110) generates a plurality of incident laser beams based on the laser control signal. A LCOS-SLM (112) modulates the plurality of incident laser beams based on the LCOS-SLM control signal, generates a plurality of holographic wavefronts (214,216), each holographic wavefront forming at least one corresponding focal point. The LCOS-SLM generates a plurality of distinct focused light field regions (506,508,510) at interference points of focal points of the plurality of holographic wavefronts. The plurality of distinct focused light field regions correspond to the two-dimensional content.

公开(公告)号：US20200150589A1

公开(公告)日：2020-05-14

申请号：US16679167

申请日：2019-11-09

申请人： Dualitas Ltd

发明人： Michal Wengierow ,  Jamieson Christmas

IPC分类号： G03H1/22 ,  G03H1/12 ,  G03H1/00 ,  G03H1/08

摘要： There is provided a driver for a spatial light modulator. The spatial light modulator comprises [m×n] pixels. The driver is arranged to receive input holograms each comprising [x×y] pixels, wherein m≥x and n≥y. The driver is further arranged to drive the spatial light modulator to display thereon output holograms each comprising [m×n] pixels by tiling each input hologram onto the pixels of the spatial light modulator to form an output hologram corresponding to each input hologram using a tiling scheme. The driver is arranged to use a first tiling scheme to display a first output hologram and a second tiling scheme to display a second output hologram. Each output hologram comprises a plurality of tiles of the input hologram. Each tiling scheme defines the size of each tile and the position of each tile on the pixels of the spatial light modulator.

公开(公告)号：US20180188684A1

公开(公告)日：2018-07-05

申请号：US15739116

申请日：2016-12-22

申请人： Dualitas Ltd.

发明人： Brian MULLINS

IPC分类号： G03H1/00 ,  G03H1/22 ,  B29C64/393 ,  B29C64/153 ,  B29C64/268 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02 ,  B23K26/34 ,  B23K26/354

CPC分类号： G03H1/0005 ,  B23K26/34 ,  B23K26/354 ,  B29C64/10 ,  B29C64/153 ,  B29C64/264 ,  B29C64/268 ,  B29C64/386 ,  B29C64/393 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/00 ,  B33Y50/02 ,  G03H1/2286 ,  G03H1/2294 ,  G03H2001/0094 ,  G03H2210/20 ,  G03H2225/32 ,  G03H2225/52 ,  G03H2240/51

摘要： A printing device (106) includes a dynamic holography printing application configured to generate a laser control signal and a LCOS-SLM (Liquid Crystal on Silicon Spatial Light Modulator) control signal based on a two-dimensional content corresponding to a lithography mask. A laser source (110) generates a plurality of incident laser beams based on the laser control signal. A LCOS-SLM (112) modulates the plurality of incident laser beams based on the LCOS-SLM control signal, generates a plurality of holographic wavefronts (214,216), each holographic wavefront forming at least one corresponding focal point. The LCOS-SLM generates a plurality of distinct focused light field regions (506,508,510) at interference points of focal points of the plurality of holographic wavefronts. The plurality of distinct focused light field regions correspond to the two-dimensional content.

公开(公告)号：US11765328B2

公开(公告)日：2023-09-19

申请号：US17000845

申请日：2020-08-24

申请人： Dualitas Ltd

发明人： Jamieson Christmas ,  Michal Wengierow ,  Nicu Gavrila

IPC分类号： H04N9/31 ,  G03H1/28

CPC分类号： H04N9/3179 ,  G03H1/28 ,  H04N9/3141 ,  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

公开(公告)号：US11758075B2

公开(公告)日：2023-09-12

申请号：US17246402

申请日：2021-04-30

申请人： Dualitas Ltd

发明人： Stig Mikael Collin

IPC分类号： H04N5/04 ,  G03H1/00 ,  G03H1/22 ,  H04N9/31 ,  H04L65/61

CPC分类号： H04N5/04 ,  G03H1/0005 ,  G03H1/2205 ,  G03H1/2294 ,  H04N9/3179 ,  G03H2001/0088 ,  G03H2001/2231 ,  G03H2225/22 ,  H04L65/61

摘要： A display system arranged to receive a video stream of frames for display. The frame rate of the video stream is defined by a first clock signal comprising a plurality of first clock reset signals (between frames). A subframe rate of the display system is defined by a second clock signal comprising a plurality of second clock reset signals (between subframes). The second clock reset signals define n subframes for each frame of the video stream. That is, the subframe rate of the display system is n times faster than the frame rate of the video stream. The display system is arranged so that duration of every nth second clock reset signal is different to the duration of the other second clock reset signals such that synchronization between frames of the video stream and subframes of the display device is maintained.

公开(公告)号：US11740456B2

公开(公告)日：2023-08-29

申请号：US16824213

申请日：2020-03-19

申请人： Dualitas Ltd

发明人： Jamieson Christmas ,  Alexander Cole

IPC分类号： G03H1/16 ,  G02B27/01 ,  G03H1/22

CPC分类号： G02B27/0103 ,  G03H1/16 ,  G03H1/2205 ,  G03H1/2294 ,  G03H2225/32 ,  G03H2225/52

摘要： There is provided a holographic projector comprising a spatial light modulator, a light source and an assembly. The spatial light modulator is arranged to display a hologram. The light source is arranged to illuminate at least one region of the spatial light modulator with an input beam such that the input beam is spatially modulated by the spatial light modulator in accordance with the hologram to form a holographic reconstruction. The assembly is arranged to move at least one of the input beam and the spatial light modulator relative to the other.

公开(公告)号：US11681257B2

公开(公告)日：2023-06-20

申请号：US17209747

申请日：2021-03-23

申请人： Dualitas Ltd

发明人： Jamieson Christmas

IPC分类号： G03H1/00 ,  G03B21/00 ,  G03H1/02 ,  G03H1/22

CPC分类号： G03H1/0005 ,  G03B21/005 ,  G03H2001/0224 ,  G03H2001/2215 ,  G03H2223/14

摘要： 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 outputs 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.

公开(公告)号：US20220221823A1

公开(公告)日：2022-07-14

申请号：US17615348

申请日：2020-07-02

申请人： DUALITAS LTD

发明人： Neil Collings ,  William Crossland ,  Jamieson Christmas

IPC分类号： G03H1/22 ,  G02F1/1362

摘要： There is disclosed a projector arranged to project a light pattern. The projector comprises a spatial light modulator and a light source. The spatial light modulator has an array of pixels arranged to display a phase pattern. The array of pixels may be a substantially planar array of pixels. Each pixel comprises liquid crystals having a director rotatable in a plane of rotation between a first direction and a second direction. The light source is arranged to illuminate the array of pixels with polarised light such that the light is spatially-modulated in accordance with the phase pattern to form the light pattern. It may be said that the light pattern corresponds to the phase pattern. The angle of incidence of the light on the array of pixels is greater than zero and the light is s-polarised. The first direction is parallel to the polarisation direction of the light. The second direction is in the plane of incidence.

公开(公告)号：US11372287B2

公开(公告)日：2022-06-28

申请号：US16645136

申请日：2018-09-06

申请人： Dualitas Ltd.

发明人： Neil Collings ,  Huan Xu

IPC分类号： G02F1/1335 ,  G02F1/1337 ,  G02F1/137 ,  G02F1/133 ,  G02F1/1343 ,  G02F1/1362 ,  G03H1/22 ,  G02B27/01 ,  G03B21/00

摘要： There is provided a holographic projector comprising a reflective liquid crystal display device. The reflective liquid crystal display device comprises a light-modulating layer between a first substrate and a second substrate substantially parallel to the first substrate. The light-modulating layer comprises planar-aligned nematic liquid crystals having positive dielectric anisotropy. The first substrate is substantially transparent and comprises a first alignment layer arranged to impart a first pre-tilt angle θι on liquid crystals proximate the first substrate, wherein θ1>5°. The second substrate is substantially reflective and comprises a second alignment layer arranged to impart a second pre-tilt angle Θ2 on liquid crystals proximate the second substrate, wherein θ2>5°. The reflective liquid crystal display device further comprises a plurality of pixels defined on the light-modulating layer having a pixel repeat distance x, wherein x≤10 μm. The distance d between inside faces of the first substrate and second substrate satisfies 0.5 μm≤d≤3 μm, and the birefringence of the liquid crystal Δη≥0.20. The holographic projector further comprises a display driver arranged to drive the reflective liquid crystal display device to display a hologram by independently-driving each pixel at a respective modulation level selected from a plurality of modulation levels having a phase modulation value.