93-6 Displays and Recorders
is typical. is frequency is too fast for the human eye to detect any on–o icker, but allows sucient
e
xibility
fo
r
in
tensity
an
d
re
fresh
co
ntrol
. In re
viewing
th
e
li
terature
on pl
asma
di
splays,
it is ea
sy
to
co
nfuse
dc an
d
ac pi
xels
si
nce
dc pi
xels
ar
e
o
en
op
erated
in pu
lsed
mo
de
an
d
wi
th
el
ectrode
po
lar-
ity
re
versal
wh
ich
di
stributes
sp
utter
da
mage
ov
er
bo
th
el
ectrode
su
rfaces
. e dc pi
xels
ar
e
re
adily
id
entied
by co
nducting
el
ectrodes
in di
rect
co
ntact
wi
th
th
e
di
scharge
ga
s
an
d
th
e
in
clusion
of a
cu
rrent-limiting
re
sistor
in th
e
ci
rcuit
fo
r
ea
ch
pi
xel
. Wh
ile
po
larity
re
versal
is op
tional
fo
r
dc pi
xel
op
eration,
it is in
herently
re
quired
fo
r
ac pi
xel
op
eration
as di
scussed
la
ter
. Dr
ive
el
ectronics,
cu
rrent ...