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