<s>
Aluminized	B-General_Concept
screen	I-General_Concept
may	O
refer	O
to	O
a	O
type	O
of	O
cathode	B-Device
ray	I-Device
tube	I-Device
(	O
CRT	O
)	O
for	O
video	O
display	O
,	O
or	O
to	O
a	O
type	O
of	O
projection	O
screen	O
for	O
showing	O
motion	O
pictures	O
or	O
slides	O
,	O
especially	O
in	O
polarized	B-Algorithm
3D	I-Algorithm
.	O
</s>
<s>
Some	O
cathode	B-Device
ray	I-Device
tubes	I-Device
,	O
e.g.	O
,	O
television	B-Device
picture	I-Device
tubes	I-Device
,	O
include	O
a	O
thin	O
layer	O
of	O
aluminium	O
deposited	O
on	O
the	O
back	O
surface	O
of	O
their	O
internal	O
phosphor	O
screen	O
coating	O
.	O
</s>
<s>
This	O
is	O
necessary	O
when	O
showing	O
3D	B-Algorithm
films	I-Algorithm
as	O
left-eye	O
and	O
right-eye	O
views	O
which	O
are	O
superimposed	O
but	O
oppositely	O
polarized	O
(	O
typically	O
at	O
opposite	O
45	O
degree	O
angles	O
to	O
the	O
vertical	O
if	O
linearly	O
polarized	O
,	O
right-handed	O
and	O
left-handed	O
if	O
circularly	O
polarized	O
)	O
.	O
</s>
