Appeal No. 96-0236
Application 08/187,364
contrast as a function of drive frequency (Transl p. 8, lines
4-19).
Referring to Figure 1 and to pages 16-17 of the translation, a
drive frequency detection circuit 9A detects the frequency of
the liquid crystal drive voltage from data signals DA and
control signals CS and generates a voltage control signal CV,
which is used to control the voltages V -V . In Figure 10, the
1 6
data signal D takes the form of a two-level signal, which we
presume represents selection and non-selection states (Transl.
p. 12, lines 13-14). The drive frequency is obtained by
measuring the frequency of the status variations between
selection and non-selection states at each signal electrode,
i.e., at each electrode of the signal side drive circuit 6
(Transl. p. 13, line 7 to p. 14, line 9). Figure 12 shows an
example of circuitry for deriving voltage control signal CV
from a plurality of signal electrode data signals D -D . This
a e
circuitry includes respective counters C -C for obtaining
a e
counts K -K of the status variations in the signal electrode
a e
data signals, an addition circuit 10 for obtaining the sum of
counts K -K , and a voltage control signal conversion circuit
a e
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Last modified: November 3, 2007