Appeal No. 1999-1552
Application No. 08/678,255
elements, it is necessary to alternate the drive voltage from
positive to negative values to the individual elements. In the
prior art, the drive for a single channel contains “D/A
converters” for both positive and negative voltages. In the
present invention, the drive of two neighboring channels is
combined in such a way to reduce the size of the “D/A converters”
and the drivers. Specifically, looking at figure 1 of the
disclosure, the drive part for two neighboring channels has a
pair of registers 10L and 10R, a pair of first data latch
circuits 12L and 12R, a pair of first switching circuits 14L and
14R, a pair of second data latch circuits 16L and 16R, a pair of
level shifters 18L and 18R, a pair of D/A converters 20L and 20R,
a pair of output amplifiers 22L and 22R, a pair of second
switching circuits 24L and 24R, and a pair of output pads 26L and
26R. All positive gray-scale voltages are supplied to the left-
side D/A converter 20L from gray-scale voltage generating circuit
28. On the other hand, all negative gray-scale voltages are
supplied to the right-side D/A converter 20R from gray-scale
voltage generating circuit 28. A further understanding of the
invention can be obtained from claim 1 of which a copy is
appended to this decision.
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