Appeal No. 1998-0883
Application 08/498,570
that the initial position of the dots of the respective
colors are shifted from one another so that dots are not
physically superimposed one exactly on another (although
there may be a slight overlap) and the strong-contrast moiré
pattern is reduced (specification, page 8, lines 1-8, 24-26;
page 9, lines 20-26). Figure 3 shows selection of the phase
signals for 90E-, 63.5E-, -63.5E-, and ±45E-screen dots and
Figures 4-6 show the offsets in the initial phases for the
different screen angles. Note, for example, that phase
signals T0, T6, T4, and T1 could have been chosen for the
63.5E-screen angle in Figure 3(b) instead of signals T1, T7,
T5, and T3; however, this would have resulted in the dots
for the 90E-screen angle and the 63.5E-screen angle having
the same initial phase and being on top of one another.
We find that Usami does not teach or suggest different
initial phases for the respective colors. Usami discloses
different delays between the lines for the various colors
(4/4 pixel or 4/8 dot for the first color; no delay for the
second and third colors; and 2/4 pixel or 2/8 dot for four
successive lines of the fourth color) (col. 12,
lines 21-34), but does not disclose a difference in the
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