<s>
Multiplexed	B-General_Concept
displays	I-General_Concept
are	O
electronic	O
display	B-Device
devices	I-Device
where	O
the	O
entire	O
display	O
is	O
not	O
driven	O
at	O
one	O
time	O
.	O
</s>
<s>
Instead	O
,	O
sub-units	O
of	O
the	O
display	O
(	O
typically	O
,	O
rows	O
or	O
columns	O
for	O
a	O
dot	B-General_Concept
matrix	I-General_Concept
display	I-General_Concept
or	O
individual	O
characters	O
for	O
a	O
character	O
oriented	O
display	O
,	O
occasionally	O
individual	O
display	O
elements	O
)	O
are	O
multiplexed	B-Architecture
,	O
that	O
is	O
,	O
driven	O
one	O
at	O
a	O
time	O
,	O
but	O
the	O
high	O
switching	O
frequency	O
and	O
the	O
persistence	O
of	O
vision	O
combine	O
to	O
make	O
the	O
viewer	O
believe	O
the	O
entire	O
display	O
is	O
continuously	O
active	O
.	O
</s>
<s>
A	O
multiplexed	B-General_Concept
display	I-General_Concept
has	O
several	O
advantages	O
compared	O
to	O
a	O
non-multiplexed	O
display	O
:	O
</s>
<s>
Multiplexed	B-General_Concept
displays	I-General_Concept
can	O
be	O
divided	O
into	O
two	O
broad	O
categories	O
:	O
</s>
<s>
Most	O
character-oriented	O
displays	O
(	O
such	O
as	O
seven-segment	B-General_Concept
displays	I-General_Concept
,	O
fourteen-segment	B-General_Concept
displays	I-General_Concept
,	O
and	O
sixteen-segment	B-General_Concept
displays	I-General_Concept
)	O
display	O
an	O
entire	O
character	O
at	O
one	O
time	O
.	O
</s>
<s>
The	O
various	O
segments	O
of	O
each	O
character	O
are	O
connected	O
in	O
a	O
two-dimensional	O
diode	B-General_Concept
matrix	I-General_Concept
and	O
will	O
only	O
illuminate	O
if	O
both	O
the	O
"	O
row	O
"	O
and	O
"	O
column	O
"	O
lines	O
of	O
the	O
matrix	O
are	O
at	O
the	O
correct	O
electrical	O
potential	O
.	O
</s>
<s>
For	O
liquid	B-Device
crystal	I-Device
displays	I-Device
,	O
the	O
intersection	O
of	O
the	O
row	O
and	O
column	O
is	O
not	O
conductive	O
at	O
all	O
.	O
</s>
<s>
One	O
by	O
one	O
,	O
the	O
microprocessor	B-Architecture
driving	O
the	O
display	O
enables	O
a	O
digit	O
by	O
placing	O
a	O
positive	O
voltage	O
on	O
that	O
digit	O
's	O
grid	O
and	O
then	O
placing	O
a	O
positive	O
voltage	O
on	O
the	O
appropriate	O
plates	O
.	O
</s>
<s>
By	O
multiplexing	B-Architecture
the	O
display	O
,	O
only	O
seven	O
"	O
digit	O
selector	O
"	O
lines	O
and	O
seven	O
"	O
segment	O
selector	O
"	O
lines	O
are	O
needed	O
.	O
</s>
<s>
are	O
arranged	O
as	O
if	O
they	O
were	O
segments	O
of	O
an	O
additional	O
digit	O
or	O
two	O
or	O
extra	O
segments	O
of	O
existing	O
digits	O
and	O
are	O
scanned	O
using	O
the	O
same	O
multiplexed	B-Architecture
strategy	O
as	O
the	O
real	O
digits	O
.	O
</s>
<s>
The	O
display	O
on	O
the	O
Hewlett-Packard	O
HP-35	B-Device
was	O
an	O
example	O
of	O
this	O
.	O
</s>
<s>
A	O
keyboard	O
matrix	O
circuit	O
has	O
a	O
very	O
similar	O
arrangement	O
as	O
a	O
multiplexed	B-General_Concept
display	I-General_Concept
,	O
and	O
has	O
many	O
of	O
the	O
same	O
advantages	O
.	O
</s>
<s>
In	O
order	O
to	O
reduce	O
the	O
number	O
of	O
wires	O
even	O
further	O
,	O
some	O
people	O
"	O
share	O
"	O
wires	O
between	O
a	O
multiplexed	B-General_Concept
display	I-General_Concept
and	O
a	O
keyboard	O
matrix	O
,	O
reducing	O
the	O
number	O
of	O
wires	O
even	O
further	O
.	O
</s>
<s>
By	O
comparison	O
,	O
in	O
dot-matrix	B-General_Concept
displays	I-General_Concept
,	O
individual	O
pixels	B-Algorithm
are	O
located	O
at	O
the	O
intersections	O
of	O
the	O
matrix	O
's	O
"	O
row	O
"	O
and	O
"	O
column	O
"	O
lines	O
and	O
each	O
pixel	B-Algorithm
can	O
be	O
individually	O
controlled	O
.	O
</s>
<s>
For	O
a	O
typical	O
1024×768	O
(	O
XGA	B-Device
)	O
computer	O
screen	O
,	O
2,359,296	O
wires	O
would	O
be	O
needed	O
for	O
non-multiplexed	O
control	O
.	O
</s>
<s>
But	O
by	O
arranging	O
the	O
pixels	B-Algorithm
into	O
a	O
multiplexed	B-Architecture
matrix	O
,	O
only	O
1792	O
wires	O
are	O
needed	O
;	O
a	O
completely	O
practical	O
situation	O
.	O
</s>
<s>
Pixel-oriented	O
displays	O
may	O
drive	O
a	O
single	O
pixel	B-Algorithm
at	O
a	O
time	O
or	O
an	O
entire	O
row	O
or	O
column	O
of	O
pixels	B-Algorithm
simultaneously	O
.	O
</s>
<s>
Active-matrix	B-Device
liquid	I-Device
crystal	I-Device
displays	I-Device
provide	O
a	O
storage	O
element	O
at	O
each	O
pixel	B-Algorithm
so	O
that	O
the	O
pixel	B-Algorithm
continues	O
to	O
display	O
the	O
correct	O
state	O
even	O
when	O
not	O
being	O
actively	O
driven	O
.	O
</s>
<s>
Because	O
most	O
multiplexed	B-General_Concept
displays	I-General_Concept
do	O
not	O
present	O
the	O
entire	O
display	O
simultaneously	O
,	O
they	O
are	O
subject	O
to	O
"	O
break	O
up	O
"	O
if	O
the	O
observer	O
's	O
point	O
of	O
regard	O
is	O
in	O
motion	O
.	O
</s>
<s>
For	O
example	O
,	O
if	O
the	O
observer	O
were	O
to	O
rapidly	O
swing	O
their	O
vision	O
across	O
a	O
multiplexed	B-General_Concept
display	I-General_Concept
,	O
they	O
might	O
see	O
a	O
jumble	O
of	O
individual	O
digits	O
rather	O
than	O
a	O
coherent	O
display	O
.	O
</s>
<s>
People	O
with	O
nystagmus	O
(	O
involuntary	O
eye	O
movement	O
)	O
are	O
much	O
more	O
likely	O
to	O
experience	O
the	O
effect	O
and	O
may	O
find	O
some	O
multiplexed	B-General_Concept
displays	I-General_Concept
hard	O
to	O
read	O
.	O
</s>
<s>
The	O
multiplexed	B-Architecture
nature	O
of	O
a	O
display	O
can	O
also	O
be	O
revealed	O
by	O
observing	O
it	O
through	O
a	O
mechanical	O
stroboscope	O
,	O
for	O
example	O
,	O
a	O
spinning	O
slotted	O
wheel	O
.	O
</s>
