Patents by Inventor Neil Collings

Neil Collings has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 12292644
    Abstract: A display device, a photomask for a display device and a method for fabricating a display device comprising the photomask is described. The display device comprises a plurality of pixels arranged to spatially modulate light having a first characteristic. The display device further comprises a pixel mask structure. The pixel mask structure comprises a diffractive pattern that is configured to diffract light having the first characteristic and to transmit light having a second characteristic (without diffraction). The diffractive pattern of the pixel mask structure substantially surrounds the plurality of pixels.
    Type: Grant
    Filed: June 23, 2022
    Date of Patent: May 6, 2025
    Assignee: Envisics Ltd.
    Inventors: Alexander Cole, Neil Collings
  • Patent number: 12189337
    Abstract: 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.
    Type: Grant
    Filed: July 2, 2020
    Date of Patent: January 7, 2025
    Assignee: DUALITAS LTD
    Inventors: Neil Collings, William Crossland, Jamieson Christmas
  • Patent number: 12174484
    Abstract: There is disclosed herein a liquid crystal on silicon spatial light modulator, “LCoS SLM”, device arranged for in-plane switching. The LCoS SLM device comprises: a silicon backplane (1501); a transparent substrate (1581); a liquid crystal layer (1571); an electrode structure (1505, 1507) and a reflective component (1561, 1551). The liquid crystal layer (1571) is interposed between the silicon backplane (1501) and the transparent substrate (1581). The electrode structure (1505, 1507) is formed on the silicon backplane (1501) for generating an electric field in the liquid crystal layer (1571). The electric field is substantially parallel to the silicon backplane (1501). The reflective component (1551, 1561) is opposing the transparent substrate (1581).
    Type: Grant
    Filed: July 2, 2020
    Date of Patent: December 24, 2024
    Assignee: Dualitas Ltd
    Inventors: William Crossland, Neil Collings
  • Patent number: 12140757
    Abstract: A method and system for reducing the effects of glare in a system comprising a picture generating unit, such as a holographic projector. The system may be a head-up display (HUD), which is configured to display a picture to a viewer, without requiring the user to look away from their usual viewpoint. The HUD system may be comprised within a vehicle. The glare in the system may be caused by light being incident on a surface comprising a screen or a window, through which the user looks at their usual viewpoint. The surface may comprise a windshield in a vehicle. The light that causes the glare may be ambient light. The method and system are provided for reducing the effects of glare in a system that comprises a waveguide in conjunction with the picture generating unit. The waveguide may be operable to act as an exit pupil expander.
    Type: Grant
    Filed: October 31, 2022
    Date of Patent: November 12, 2024
    Assignee: Envisics Ltd
    Inventors: Timothy Smeeton, Neil Collings
  • Patent number: 12140756
    Abstract: A method and system for reducing the effects of glare in a system comprising a picture generating unit, such as a holographic projector. The system may be a head-up display (HUD), which is configured to display a picture to a viewer, without requiring the user to look away from their usual viewpoint. The HUD system may be comprised within a vehicle. The glare in the system may be caused by light being incident on a surface comprising a screen or a window, through which the user looks at their usual viewpoint. The surface may comprise a windshield in a vehicle. The light that causes the glare may be ambient light. The method and system are provided for reducing the effects of glare in a system that comprises a waveguide in conjunction with the picture generating unit. The waveguide may be operable to act as an exit pupil expander.
    Type: Grant
    Filed: October 20, 2021
    Date of Patent: November 12, 2024
    Assignee: Envisics Ltd
    Inventors: Timothy Smeeton, Neil Collings
  • Patent number: 11966046
    Abstract: A waveguide arranged as a pupil expander for a display system is disclosed. The waveguide comprises a pair of opposing surfaces arranged to guide a light field therebetween by internal reflection. An input port is arranged to receive light from the display system. A reflective element is arranged to internally reflect the light field. The input port and reflective element are formed on a second surface of the pair of opposing surfaces. An output port is formed on a first surface of the pair of opposing surfaces by a transmissive-reflective element configured to divide the light field at each internal reflection therefrom such that a plurality of replicas of the light field are transmitted out of the waveguide through the output port.
    Type: Grant
    Filed: December 6, 2022
    Date of Patent: April 23, 2024
    Assignee: Envisics Ltd
    Inventors: Timothy Smeeton, Neil Collings, Yiren Xia, Rakesh Maharjan
  • Publication number: 20230418060
    Abstract: A light turning element and a method fabricating such a light turning element are described. The light turning element comprises a layer of liquid crystal material. The layer of liquid crystal material defining a plane. The layer of liquid crystal material is configured such that an angle (?) between a director (n) of the liquid crystal material and a first dimension (x) is an oscillating function of position in the first dimension x. The first dimension x is a dimension within the plane.
    Type: Application
    Filed: May 12, 2023
    Publication date: December 28, 2023
    Inventors: Jamieson Christmas, Neil Collings, Celedonia Krawczyk, Tim Smeeton
  • Publication number: 20230333374
    Abstract: Disclosed embodiments include a display system having a viewing window on a viewing plane, the display system comprising a picture-generating unit and an imaging system, where the picture-generating unit displays a picture on a display plane that is a holographic reconstruction formed from a hologram of the picture. The imaging system comprises a projection lens disposed between the display plane and viewing plane, an aperture stop, and a waveguide pupil expander. The projection lens comprises a pair of planar surfaces that define the boundaries of the projection lens, the aperture stop restricts the aperture of the projection lens in the first direction and forms the limiting aperture stop of the imaging system, and the waveguide pupil expander receives light of the picture from the projection lens through the aperture stop and replicates the aperture stop to expand the viewing window of the display system.
    Type: Application
    Filed: December 2, 2020
    Publication date: October 19, 2023
    Inventors: Neil Collings, Alexander Cole
  • Publication number: 20230194860
    Abstract: A waveguide arranged as a pupil expander for a display system is disclosed. The waveguide comprises a pair of opposing surfaces arranged to guide a light field therebetween by internal reflection. An input port is arranged to receive light from the display system. A reflective element is arranged to internally reflect the light field. The input port and reflective element are formed on a second surface of the pair of opposing surfaces. An output port is formed on a first surface of the pair of opposing surfaces by a transmissive-reflective element configured to divide the light field at each internal reflection therefrom such that a plurality of replicas of the light field are transmitted out of the waveguide through the output port.
    Type: Application
    Filed: December 6, 2022
    Publication date: June 22, 2023
    Inventors: Timothy Smeeton, Neil Collings, Yiren Xia, Rakesh Maharjan
  • Publication number: 20230050648
    Abstract: A method and system for reducing the effects of glare in a system comprising a picture generating unit, such as a holographic projector. The system may be a head-up display (HUD), which is configured to display a picture to a viewer, without requiring the user to look away from their usual viewpoint. The HUD system may be comprised within a vehicle. The glare in the system may be caused by light being incident on a surface comprising a screen or a window, through which the user looks at their usual viewpoint. The surface may comprise a windshield in a vehicle. The light that causes the glare may be ambient light. The method and system are provided for reducing the effects of glare in a system that comprises a waveguide in conjunction with the picture generating unit. The waveguide may be operable to act as an exit pupil expander.
    Type: Application
    Filed: October 31, 2022
    Publication date: February 16, 2023
    Inventors: Timothy Smeeton, Neil Collings
  • Publication number: 20230011653
    Abstract: A display device, a photomask for a display device and a method for fabricating a display device comprising the photomask is described. The display device comprises a plurality of pixels arranged to spatially modulate light having a first characteristic. The display device further comprises a pixel mask structure. The pixel mask structure comprises a diffractive pattern that is configured to diffract light having the first characteristic and to transmit light having a second characteristic (without diffraction). The diffractive pattern of the pixel mask structure substantially surrounds the plurality of pixels.
    Type: Application
    Filed: June 23, 2022
    Publication date: January 12, 2023
    Inventors: Alexander Cole, Neil Collings
  • Publication number: 20220373970
    Abstract: There is disclosed herein a liquid crystal on silicon spatial light modulator, “LCoS SLM”, device arranged for in-plane switching. The LCoS SLM device comprises: a silicon backplane (1501); a transparent substrate (1581); a liquid crystal layer (1571); an electrode structure (1505, 1507) and a reflective component (1561, 1551). The liquid crystal layer (1571) is interposed between the silicon backplane (1501) and the transparent substrate (1581). The electrode structure (1505, 1507) is formed on the silicon backplane (1501) for generating an electric field in the liquid crystal layer (1571). The electric field is substantially parallel to the silicon backplane (1501). The reflective component (1551, 1561) is opposing the transparent substrate (1581).
    Type: Application
    Filed: July 2, 2020
    Publication date: November 24, 2022
    Inventors: William Crossland, Neil Collings
  • Patent number: 11454929
    Abstract: A method of calculating a hologram having an amplitude and a phase component. The method comprises (i) receiving an input image comprising a plurality of data values representing amplitude. The method then comprises (ii) assigning a random phase value to each data value of the plurality of data values to form a complex data set. The method then comprises (iii) performing an inverse Fourier transform of the complex data set. The method then comprises (iv) constraining each complex data value (X1, X2) of the transformed complex data set to one of a plurality of allowable complex data values (GL1-GL8), each comprising an amplitude modulation value and a phase modulation value, to form a hologram, wherein, the phase modulation values (GL1-GL7) of the plurality of allowable complex data values substantially span at least 3?/2 and at least one of the allowable complex data values has an amplitude modulation value of substantially zero (GL8) and a phase modulation value of substantially zero.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: September 27, 2022
    Assignee: DUALITAS LTD
    Inventors: Neil Collings, Jamieson Christmas
  • Publication number: 20220221823
    Abstract: 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.
    Type: Application
    Filed: July 2, 2020
    Publication date: July 14, 2022
    Inventors: Neil Collings, William Crossland, Jamieson Christmas
  • Patent number: 11372287
    Abstract: 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 ?? on liquid crystals proximate the first substrate, wherein ?1>5°. The second substrate is substantially reflective and comprises a second alignment layer arranged to impart a second pre-tilt angle ?2 on liquid crystals proximate the second substrate, wherein ?2>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 ?m.
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: June 28, 2022
    Assignee: DUALITAS LTD
    Inventors: Neil Collings, Huan Xu
  • Publication number: 20220121028
    Abstract: A method and system for reducing the effects of glare in a system comprising a picture generating unit, such as a holographic projector. The system may be a head-up display (HUD), which is configured to display a picture to a viewer, without requiring the user to look away from their usual viewpoint. The HUD system may be comprised within a vehicle. The glare in the system may be caused by light being incident on a surface comprising a screen or a window, through which the user looks at their usual viewpoint. The surface may comprise a windshield in a vehicle. The light that causes the glare may be ambient light. The method and system are provided for reducing the effects of glare in a system that comprises a waveguide in conjunction with the picture generating unit. The waveguide may be operable to act as an exit pupil expander.
    Type: Application
    Filed: October 20, 2021
    Publication date: April 21, 2022
    Inventors: Timothy Smeeton, Neil Collings
  • Patent number: 11275339
    Abstract: 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.
    Type: Grant
    Filed: October 28, 2019
    Date of Patent: March 15, 2022
    Assignee: DUALITAS LTD
    Inventors: Neil Collings, Jamieson Christmas
  • Publication number: 20210232005
    Abstract: 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 ?l on liquid crystals proximate the first substrate, wherein ?1>5°. The second substrate is substantially reflective and comprises a second alignment layer arranged to impart a second pre-tilt angle ?2 on liquid crystals proximate the second substrate, wherein ?2>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 ?m.
    Type: Application
    Filed: September 6, 2018
    Publication date: July 29, 2021
    Inventors: Neil Collings, Huan Xu
  • Publication number: 20210173341
    Abstract: A method of calculating a hologram having an amplitude and a phase component. The method comprises (i) receiving an input image comprising a plurality of data values representing amplitude. The method then comprises (ii) assigning a random phase value to each data value of the plurality of data values to form a complex data set. The method then comprises (iii) performing an inverse Fourier transform of the complex data set. The method then comprises (iv) constraining each complex data value (X1, X2) of the transformed complex data set to one of a plurality of allowable complex data values (GL1-GL8), each comprising an amplitude modulation value and a phase modulation value, to form a hologram, wherein, the phase modulation values (GL1-GL7) of the plurality of allowable complex data values substantially span at least 3?/2 and at least one of the allowable complex data values has an amplitude modulation value of substantially zero (GL8) and a phase modulation value of substantially zero.
    Type: Application
    Filed: August 22, 2019
    Publication date: June 10, 2021
    Inventors: Neil Collings, Jamieson Christmas
  • Publication number: 20210149341
    Abstract: An illumination system is arranged to output a light beam for illuminating a scene. The system comprises a spatial light modulator arranged to receive incident light, and to output light comprising a first component and a second component. The first component comprises incident light that is output without modulation by the spatial light modulator. The second component comprises incident light that is spatially-modulated according to a hologram and output by the spatial light modulator. A control device is operable to control the proportion of light output by the spatial light modulator that corresponds to the second component.
    Type: Application
    Filed: July 26, 2019
    Publication date: May 20, 2021
    Inventors: Ian Bledowski, Konstantin Deichsel, Neil Collings, Jamieson Christmas