Patents by Inventor William A Crossland

William A Crossland 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: 4574282
    Abstract: A coherent light image generator for signal processing such as image correlation directs laser light onto a specularly reflecting matrix addressed dyed nematic liquid crystal display device having a liquid crystal layer sandwiched between a transparent electroded front plate and an active single crystal silicon wafer incorporating NMOS circuitry.
    Type: Grant
    Filed: March 18, 1983
    Date of Patent: March 4, 1986
    Assignee: International Standard Electric Corporation
    Inventors: William A. Crossland, Jack R. Peters, Peter W. Ross, Peter J. Ayliffe
  • Patent number: 4528562
    Abstract: A co-ordinate matrix addressing system is used to address a liquid crystal display cell containing a positive dielectric anisotropy smectic material. For this purpose one or more direct voltage pulses are applied across selected elemental volumes of the display to convert them from a focal-conic scattering state to a homeotropically aligned state. Prior to this all elements are electrically driven into the turbulent scattering state which relaxes into the focal-conic scattering state upon removal of the driving field. The driving field may also take the form of direct voltage pulses. Unselected elemental volumes may be refreshed to substantially their original level of focal-conic scattering by means of a suitable blanking potential applied to both selected and unselected elemental volumes which nevertheless leaves previously restored elemental volumes in the homeotropically aligned state.
    Type: Grant
    Filed: August 25, 1983
    Date of Patent: July 9, 1985
    Assignee: International Standard Electric Corporation
    Inventors: William A. Crossland, David Coates, Peter J. Ayliffe
  • Patent number: 4511926
    Abstract: A curtailed drive scheme for a matrix array liquid crystal display cell in which the field developed across each picture element is maintained for only a fraction of the time interval between consecutive addressings. This reduces the effects of differences in time constants across the display for addressing schemes in which the average time constant is short compared with this time interval between consecutive addressings.
    Type: Grant
    Filed: March 31, 1983
    Date of Patent: April 16, 1985
    Assignee: International Standard Electric Corporation
    Inventors: William A. Crossland, Peter W. Ross, Peter J. Ayliffe
  • Patent number: 4419664
    Abstract: A co-ordinate matrix addressing system is used to address a liquid crystal display cell containing a positive dielectric anisotropy smectic material. For this purpose one or more direct voltage pulses are applied across selected elemental volumes of the display to convert them from a focal-conic scattering state to a homeotropically aligned state. Prior to this all elements are electrically driven into the turbulent scattering state which relaxes into the focal-conic scattering state upon removal of the driving field. The driving field may also take the form of direct voltage pulses.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: December 6, 1983
    Assignee: International Standard Electric Corporation
    Inventors: William A. Crossland, David Coates, Peter J. Ayliffe
  • Patent number: 4411494
    Abstract: An internally electroded smectic liquid crystal display cell having a layer of a smectic material sandwiched between two electroded plates having electrodes that overlap at least in part wherein each said electrode is covered with an electrically insulating coherent layer whose surface has been treated to provide it with a rough texture provides a liquid crystal display cell of low voltage threshold characteristics.
    Type: Grant
    Filed: November 21, 1980
    Date of Patent: October 25, 1983
    Assignee: International Standard Electric Corporation
    Inventors: William A. Crossland, David Coates
  • Patent number: 4353943
    Abstract: In a liquid crystal cell parallel homogeneous alignment of the liquid crystal molecules is provided by rubbing a silica or silica containing film produced by firing a silica containing organic coating applied in liquid form. The alignment provided by this process can withstand firing temperatures in the range 450.degree. to 500.degree. C. normally employed for making fused glass frit perimeter seals. By incorporating titania into the film the refractive index can be matched with that of the underlying electrodes and so render them substantially invisible.
    Type: Grant
    Filed: August 10, 1981
    Date of Patent: October 12, 1982
    Assignee: ITT Industries, Inc.
    Inventors: William A. Crossland, Joseph H. Morrissy
  • Patent number: 4291948
    Abstract: A liquid crystal display cell provides more than two contrasting colors that operates in a storage mode which has a positive dielectric anisotropy smectic liquid layer between electroded plates treated to produce parallel homogeneous alignment with a very large tilt angle. The tilt angle can be progressively increased by increasing the strength of an applied alternating potential thereby producing Newtonian colors when viewed through crossed polarizers. When pseudo-homogeneous zero tilt alignment is provided, a pleochroic dye may be mixed with the smectic to provide a color when the layer is in the pseudo-homogeneous alignment state. An applied electric field converts this to homeotropic alignment.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: September 29, 1981
    Assignee: International Standard Electric Corporation
    Inventors: William A. Crossland, Joseph H. Morrissy, David Coates
  • Patent number: 4279152
    Abstract: A liquid crystal temperature indicator that gives a visual indication of whether the device is at a temperature above or below one or more threshold values has a homeotropically aligned nematic or smectic layer incorporating a pleochroic dye. The color of the cell changes as the dye will only absorb normally incident light when the temperature causes the liquid to go isotropic. Electrodes may be provided to provide electronic detection of the passage of the liquid through the threshold temperature.
    Type: Grant
    Filed: February 22, 1979
    Date of Patent: July 21, 1981
    Assignee: International Standard Electric Corporation
    Inventor: William A. Crossland
  • Patent number: 4139273
    Abstract: A method for preparing and operating dynamic scattering liquid crystal display cells having internal electrodes and containing a smectic liquid having positive dielectric anisotropy and incorporating a homeotrophic alignment inducing medium for the smectic liquid filling. The cell can be switched off to make the transition from dynamic scattering to static scattering for providing indefinite storage properties.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: February 13, 1979
    Assignee: International Standard Electric Corporation
    Inventors: William A. Crossland, Joseph H. Morrissy, Barbara Needham
  • Patent number: 4130408
    Abstract: A method of controlling the spacing between the panels in large area liquid crystal cells consisting of the application of an array of spacer dots on one panel and an array of tie dots on the other panel. Upon firing the panels, the spacer dots remain rigid to define the spacing whereas the tie dots soften and deform.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: December 19, 1978
    Assignee: International Standard Electric Corporation
    Inventors: William A. Crossland, Joseph H. Morrissy
  • Patent number: 4114990
    Abstract: A cholesteric filled liquid crystal cell has one surface homeotropically aligned and the opposite surface homogeneous parallel aligned. Plane polarized light incident upon the homogeneous parallel aligned surface with its polarization plane parallel with or orthogonal to the alignment direction has its plane of polarisation rotated by an amount controllable by the application of an electric potential across the cell. This forms the active element of a simulated rotating pointer meter display having no moving parts and only a single pair of electrical inputs.
    Type: Grant
    Filed: May 4, 1977
    Date of Patent: September 19, 1978
    Assignee: International Standard Electric Corporation
    Inventors: Derek H. Mash, William A. Crossland, Joseph H. Morrissy