Appeal No. 1997-0384
Application 08/086,498
circuit for scrolling information image frames across a liquid
crystal display, except for the details of the blanking
interval recited in the claim. The examiner admits that
"Tsunoda does not address consideration of accommodating decay
rates to prevent interference" between images on a LCD
(Answer, page 8). The examiner goes on to admit that "Tsunoda
does not teach the blanking interval being proportional to the
decay rate of the display screen" (Answer, page 6) as called
for in representative claim 1, and then relies upon the
secondary reference to Hilsum for this feature. The examiner
states that it would have been obvious to modify the display
circuit of Tsunoda with the blanking pulse of Hilsum (Hilsum’s
blanking pulse being proportional to the decay rate of the
screen) "so that the display elements of the images are not
overlapped" (Answer, page 6).
We note that Hilsum has nothing to do with scrolling in a
LCD, and instead relates to refreshing in a LCD (see Hilsum,
column 1, lines 4 to 5). Refreshing concerns trying to keep
an element in the display activated for a given length of time
so that an image can be seen. Scrolling on the other hand,
concerns keeping an element unactivated (i.e., blanked) for a
6
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