Appeal No. 2006-1726
Application No. 09/725,849
gate pulse GP is again turned off, the liquid crystal
pixel cells maintain a ground voltage.
Thus, the liquid crystal pixel cells have an increasing
transmittance T during the beginning half interval of
each frame charged by the video data Vdata as shown in
Fig. 8 in a normally black mode to transmit a light
inputted from a backlight unit, and have a decreasing
transmittance T during the ending half interval of each
frame to shut off the incident light. As a result,
since each of the liquid crystal pixel cells is
completely discharged before the end of each frame, a
residual image does not appear in the next frame by the
video data maintained in the previous frame. In other
words, the liquid crystal pixel cells are turned on and
off in approximately a half period of each frame.
Thus, the claim does require that a first signal be
applied to the crystal pixel cells for charging thereof during
the beginning of a frame and applying a second signal to the
pixel cells for discharging thereof during the ending of the
frame.
Now the question before us is what Takahashi would have
taught to one of ordinary skill in the art? To answer this
question, we find the following facts:
1. Takahashi states at column 14, lines 9 through 34 that:
Each scanning signal supplied from the scanning signal
drive circuit 100 has a first selecting voltage which
is set to VS1 in the charging mode, and which is
supplied to one of the scanning lines Y1 to Ym in a
charging period Tcc corresponding to the second half
1/2H of one horizontal period H. Tccj and Tccj-1
written in FIGS. 8(B) and 8(C) respectively denote the
charging periods in the charging modes with respect to
7
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