<s>
DSTN	B-Application
(	O
double	O
super	O
twisted	O
nematic	O
)	O
,	O
also	O
known	O
as	O
dual-scan	B-Application
super	O
twisted	O
nematic	O
or	O
simply	O
dual-scan	B-Application
,	O
is	O
an	O
LCD	B-Device
technology	O
in	O
which	O
a	O
screen	O
is	O
divided	O
in	O
half	O
,	O
which	O
are	O
simultaneously	O
refreshed	O
giving	O
faster	O
refresh	O
rate	O
than	O
traditional	O
passive	B-Device
matrix	I-Device
screens	O
.	O
</s>
<s>
It	O
is	O
an	O
improved	O
form	O
of	O
supertwist	B-General_Concept
nematic	I-General_Concept
display	O
that	O
offers	O
low	O
power	O
consumption	O
but	O
inferior	O
sharpness	O
and	O
brightness	O
compared	O
to	O
TFT	B-Device
screens	I-Device
.	O
</s>
<s>
For	O
several	O
years	O
(	O
early	O
1990s	O
to	O
early	O
2000s	O
)	O
,	O
TFT	B-Device
screens	I-Device
were	O
only	O
found	O
in	O
high-end	O
laptops	B-Device
due	O
to	O
them	O
being	O
more	O
expensive	O
and	O
lower-end	O
laptops	B-Device
offering	O
DSTN	B-Application
screens	O
only	O
.	O
</s>
<s>
This	O
was	O
at	O
a	O
time	O
when	O
the	O
screen	O
was	O
often	O
the	O
most	O
expensive	O
component	O
of	O
laptops	B-Device
.	O
</s>
<s>
The	O
price	O
difference	O
between	O
a	O
laptop	B-Device
with	O
DSTN	B-Application
and	O
one	O
with	O
TFT	O
could	O
easily	O
be	O
$400	O
or	O
more	O
.	O
</s>
<s>
DSTN	B-Application
display	O
quality	O
is	O
poor	O
compared	O
to	O
TFT	O
,	O
with	O
visible	O
noise	O
,	O
smearing	O
,	O
much	O
lower	O
contrast	O
and	O
slow	O
response	O
.	O
</s>
