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Flickering in interlaced raster scan displays using single dot characters is minimized by merely structuring the character font so as to eliminate solitary, isolated dots in the character.
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Font Design Minimizing Flickering In Interlaced Raster Scan Display Using
Single Dot Characters
Flickering in interlaced raster scan displays using single dot characters is
minimized by merely structuring the character font so as to eliminate solitary,
isolated dots in the character.
The two major types of raster scan technology are progressive scan and
interlace scan. In progressive scanning, the character slices in Fig. 1 would be
scanned sequentially. In interlace scanning, the odd lines would be scanned in
one field and the even lines would be scanned in the other. Progressive
scanning requires a higher refresh rate than interlace scanning, which implies
that more scan lines are available with interlace scanning, assuming the same
scan rate. Therefore, interlace scanning allows a greater number of characters.
One of the problems with interlace scanning is flicker. If the field rate on the
monitor is 60 Hz, each field is scanned at a 30 Hz rate which is slow enough for
flicker to be a problem. The obvious solution would be to repeat the character in
both fields. This technique, called double dotting, works very well, but decreases
the number of lines available and restricts the flexibility of the font design.
We have found that in interlace scanning flicker occurs when solitary dots are
on the character's edge. With reference to Fig. 2, when a solitary dot, such as
dot 10, is present, the character seems to shift back and forth on the display,