Resistive electrode LCD and voltage supply means
AssigneeFerranti Limited (now Ferranti plc)
InventorJohn M. Morrison
Life of this patent
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Abstract
A liquid display device comprises two spaced electrodes each having a resistance characteristic such that a potential gradient may be developed across the electrode. A liquid crystal material is located between the two electrodes. Voltage supply means are provided which apply an alternating potential across each electrode, such that the two potentials are of the same frequency, and, preferably, in quadrature with one another.
Claims6
A display device which includes a pair of spaced electrodes each having a resistance characteristic such that a potential gradient may be developed across the electrode, a pair of terminals on each electrode located such that the potential gradients developed across the two electrodes extend at an angle to one another, a liquid crystal material located between the two electrodes and being of a type which becomes opaque when an electric field is applied across it, voltage supply means operable to apply an alternating potential across each pair of terminals, such that the two potentials are of the same frequency and are out of phase with one another by an angle which determines the form of the display and in which the voltage supply means are arranged to provide, across each electrode, a constant voltage and include means for varying the potential of each terminal with respect to a reference potential.
Dependencies are inferred from the claim text.