Patents by Inventor Johnathan R. Hughes

Johnathan R. Hughes 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: 5047757
    Abstract: A method is disclosed for addressing a matrix-array type liquid crystal layer. The cell has a plurality of pixels which are defined by regions of overlap between two sets of electrodes which sandwich a liquid crystal layer, each pixel having two states. The response time for switching between the two states is dependent upon the voltage across the liquid crystal layer, with a minimum occurring at a particular voltage. The method includes applying a strobe waveform to a selected member of a first set of the electrodes while a data waveform is applied to each member of the second set of electrodes. A waveform for switching a pixel defined by the selected member comprises a switching pulse of a given voltage magnitude and given duration. A waveform for not switching a pixel defined by the selected member comprises a non-switching pulse of a voltage magnitude greater than the given voltage magnitude of the switching pulse and a duration less than the given duration of the switching pulse.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: September 10, 1991
    Assignees: STC plc, The Secretary of State for Defence, Thorn EMI
    Inventors: Matthew F. Bone, Ian Coulson, Johnathan R. Hughes, Peter W. Ross, Frances C. Saunders, Paul W. H. Surguy