Appeal No. 1997-0412
Application No. 08/434,558
the manner of superimposing has not been explicitly
set forth in the original disclosure. Here it has
to be noted that time multiplexing is a manner of
superimposing two signals.
Page 12, lines 4-7 of the original specification
only states the signals are mixed not to cause
interference. Page 19, lines 16-18 states only that
the positioning signals are of high frequency not to
interfere with the display.
Reading the specification as a whole, we find appellant
has adequately described simultaneous sensing and displaying.
Appellant discloses (Specification, page 6, line 9-page 7,
line 10) that in the prior art, the display electrodes served
to sense position and to display. However, in the prior art,
the electrodes of the display were used alternately for
display and for position-sensing, which caused problems such
as reducing the amount of time available for driving each
pixel and interrupting the drive signals. In the SUMMARY OF
THE INVENTION (Specification, page 10, lines 8-10), appellant
states that in his invention, "[p]referably, the positioning
signals are AC signals that may be superimposed on the display
matrix drive signals without interrupting the display and
without the need for multiplexing the display drive signals"
(emphasis added). In other words, since alternating the two
types of signals (or rather having the two types of signals at
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