Appeal No. 1999-1559
Application No. 08/762,687
that Tsuboyama fails to teach or even suggest the proposed
modification by the Examiner. In particular, we note that in
column 3, lines 22 through 24, Tsuboyama is concerned with
unrelated problems of the need for spacing between the
substrates and the tilt angle. Tsuboyama is not concerned
with the problem of providing operational bistability of the
pixel based upon variations of nematic temperature.
In regard to Fukai, we find no suggestion of varying the
frequency of the voltage to overcome the problems of the
liquid crystal material employed. While Fukai shows a liquid
crystal display device having a nematic crystal material,
there is no teaching or suggestion that Fukai contemplates the
problems of using a liquid crystal material that is a twisted
nematic liquid crystal material having a positive dielectric
anisotropy as Appellant has claimed.
We note that the only relevant art concerning the problem
of a twisted nematic liquid crystal material having a positive
dielectric anisotropy is the prior art admitted by the
Appellant found on page 1 of the specification. The admitted
prior art recognizes the problem that this type of material
has problems at varying ambient temperature because of the
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