Appeal No. 96-0236
Application 08/187,364
threshold characteristic between a row conductor and a column
conductor, and picture element drive means connected to the
sets of address conductors for applying drive voltages to the
picture elements comprising a scanning signal drive circuit
for applying selection signals to the conductors of one set
and a data signal drive circuit for applying data signals to
the conductors of the other set, characterised in that the
drive means includes a sensing circuit which is arranged to
provide a control signal indicative of electrical current
flowing in at least one address conductor of the one set in
response to the application of selection signals to that
address conductor, and a voltage control circuit to which the
control signal is supplied for determining the drive voltages
applied by the drive means to the picture elements in
accordance with the value of the control signal.
13. A method of operating a matrix display device
comprising sets of row and column address conductors, a row
and column array of picture elements operable to produce a
display, each of which comprises an electro-optic display
element connected in series with a two terminal non-linear
device exhibiting a threshold characteristic between a row
conductor and a column conductor, and picture element drive
means connected to the sets of address conductors for applying
drive voltages to the picture elements comprising a scanning
signal drive circuit for applying selection signals to the
conductors of one set and a data signal drive circuit for
applying data signals to the conductors of the other set,
characterised by the steps of deriving a control signal
indicative of the electrial current flowing in at least one
address conductor of the one set in response to the
application of selection signals to that address conductor and
controlling the level of the drive voltages applied to the
picture elements in accordance with the value of the control
signal.
We note that although method claimed 13 appears to be in
proper step-plus-function format and thus is entitled to be
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