Appeal No. 97-2020
Application 07/957,107
Appellants further point out that Appellants have not only
recognized the problems in regard to active matrix displays,
but also have overcome these problems by the use of a
combination of pulse width and pulse amplitude modulations.
We note on page 4 of the answer, the Examiner simply
states that the reason for the combination of using De Jule's
pulse modulation and width modulation is so that gradation of
a matrix display could have been achieved by using combined
pulse modulation and width modulation in the driving circuit
as an alternative of using pulse modulation or width
modulation individually by itself. On page 7 of the answer,
the Examiner argues that De Jule is a broad teaching of using
combined pulse modulation and width modulation. However, the
Examiner does not address the fact that De Jule teaches uses
of these modulation techniques for a display device that does
not have an active switching element at each pixel.
Turning to Appellants' specification, we note on
page 2 of the specification that Appellants disclose that the
prior art used the optical material itself as the switching
element. Appellants state that this type of display device is
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