Appeal No. 96-0236
Application 08/187,364
Hoshino discloses voltage control circuitry for
controlling contrast in a liquid crystal display device as a
function of the drive frequency of the individual elements of
the display device (Abstract; Transl. p. 3, last sentence).
Referring to Figure 3, individual picture elements are
selected for activation by a scanning side drive circuit 7 and
a signal side drive circuit 6 (Transl. at 5, lines 23-25).
Figures 4(b) and 4(c) show examples of scanning side drive
voltages and signal side voltages, respectively, which have
voltage levels V -V . Figure 4(a) shows the difference between
1 6
these two voltages, which is the differential drive signal
across the display elements. In this differential drive
signal, voltage levels V and -V are selection voltages, Vs s n
and -V are non-selection voltages, and V and -V are biasn b b
voltages (Transl. p. 5, lines 20-21). Referring to Figure 6:
waveform FLM is a frame signal; waveform CL is a dot clock
signal; waveform V is a differential drive signal in which
A
the drive frequency is the lowest; and waveform V is a
B
differential drive signal in which the drive frequency is the
highest (Transl. p. 7, line 23 to p. 8, line 3). Figure 7
shows the differential voltage needed to achieve maximum
- 6 -
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Last modified: November 3, 2007