Appeal No. 1999-1552
Application No. 08/678,255
Appendix
Claim 1
1. A signal line drive circuit for an LCD having
multiple lines of pixels arranged in columns, each
pixel being coupled to a gate line terminal for
receiving an activating voltage for the pixel, a common
voltage terminal, and a signal line terminal for
receiving an analog gray-scale voltage relative to the
common voltage terminal for specifying the brightness
of that pixel, said signal line drive circuit
comprising for adjacent paired columns of the display:
a common terminal for coupling to the LCD's common
voltage terminal;
first and second gray scale data terminals for
receiving first and second digital gray-scale signals;
first and second D/A conversion circuits for
common coupling to neighboring first and second signal
line terminals of the LCD, for respectively generating
positive and negative analog gray-scale voltages; and
a first switching circuit for cycling the first
and second D/A conversion circuits between
a first operation, in which the first D/A
conversion circuit generates a positive gray-scale
voltage responsive to the first gray-scale data at the
same time the second D/A conversion circuit generates a
negative gray-scale voltage responsive to the second
gray-scale data, and
a second operation, in which the first D/A
conversion circuit generates a positive gray-scale
voltage responsive to the second gray-scale data at the
same time the second D/A conversion circuit generates a
negative gray-scale voltage responsive to the first
gray-scale data; and
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Last modified: November 3, 2007