<s>
Image	B-Device
persistence	I-Device
,	O
or	O
image	B-Device
retention	I-Device
,	O
is	O
the	O
LCD	B-Device
and	O
plasma	O
display	O
equivalent	O
of	O
screen	B-General_Concept
burn-in	I-General_Concept
.	O
</s>
<s>
Unlike	O
screen	B-General_Concept
burn	I-General_Concept
,	O
the	O
effects	O
are	O
usually	O
temporary	O
and	O
often	O
not	O
visible	O
without	O
close	O
inspection	O
.	O
</s>
<s>
Plasma	O
displays	O
experiencing	O
severe	O
image	B-Device
persistence	I-Device
can	O
result	O
in	O
screen	B-General_Concept
burn-in	I-General_Concept
instead	O
.	O
</s>
<s>
Image	B-Device
persistence	I-Device
can	O
occur	O
as	O
easily	O
as	O
having	O
something	O
remain	O
unchanged	O
on	O
the	O
screen	O
in	O
the	O
same	O
location	O
for	O
a	O
duration	O
of	O
even	O
10	O
minutes	O
,	O
such	O
as	O
a	O
web	O
page	O
or	O
document	O
.	O
</s>
<s>
Minor	O
cases	O
of	O
image	B-Device
persistence	I-Device
are	O
generally	O
only	O
visible	O
when	O
looking	O
at	O
darker	O
areas	O
on	O
the	O
screen	O
,	O
and	O
usually	O
invisible	O
to	O
the	O
eye	O
during	O
ordinary	O
computer	O
use	O
.	O
</s>
<s>
Liquid	B-Device
crystals	I-Device
have	O
a	O
natural	O
relaxed	O
state	O
.	O
</s>
<s>
displaying	O
a	O
pointer	O
or	O
the	O
Taskbar	O
in	O
one	O
place	O
,	O
or	O
showing	O
a	O
static	O
picture	O
for	O
extended	O
periods	O
of	O
time	O
)	O
,	O
the	O
liquid	B-Device
crystals	I-Device
can	O
develop	O
a	O
tendency	O
to	O
stay	O
in	O
one	O
position	O
.	O
</s>
<s>
In	O
fact	O
,	O
the	O
root	O
cause	O
of	O
LCD	B-Device
image	B-Device
persistence	I-Device
is	O
the	O
same	O
as	O
phosphor	O
burn-in	O
,	O
namely	O
,	O
non-uniform	O
usage	O
of	O
the	O
display	O
's	O
pixels	O
.	O
</s>
<s>
It	O
might	O
be	O
due	O
to	O
accumulation	O
of	O
ionic	O
impurities	O
inside	O
the	O
LCD	B-Device
,	O
electric	O
charge	O
building	O
up	O
near	O
the	O
electrodes	O
,	O
parasitic	O
capacitance	O
,	O
or	O
"	O
a	O
DC	O
voltage	O
component	O
that	O
occurs	O
unavoidably	O
in	O
some	O
display	O
pixels	O
owing	O
to	O
anisotropy	O
in	O
the	O
dielectric	O
constant	O
of	O
the	O
liquid	B-Device
crystal	I-Device
"	O
.	O
</s>
<s>
Image	B-Device
persistence	I-Device
can	O
be	O
reversed	O
by	O
allowing	O
the	O
liquid	B-Device
crystals	I-Device
to	O
relax	O
and	O
return	O
to	O
their	O
relaxed	O
state	O
,	O
such	O
as	O
by	O
turning	O
off	O
the	O
monitor	O
for	O
a	O
sufficiently	O
long	O
period	O
of	O
time	O
(	O
at	O
least	O
a	O
few	O
hours	O
)	O
.	O
</s>
<s>
One	O
strategy	O
for	O
users	O
looking	O
to	O
avoid	O
image	B-Device
persistence	I-Device
artifacts	O
is	O
to	O
vary	O
the	O
activities	O
performed	O
on	O
a	O
computer	O
to	O
avoid	O
static	O
colors	O
and	O
hide	O
elements	O
on	O
the	O
screen	O
which	O
are	O
displayed	O
perpetually	O
(	O
such	O
as	O
an	O
OS	O
's	O
Taskbar	O
)	O
.	O
</s>
<s>
Another	O
strategy	O
is	O
the	O
usage	O
of	O
a	O
screensaver	B-General_Concept
to	O
help	O
during	O
times	O
the	O
computer	O
is	O
left	O
unattended	O
.	O
</s>
