<s>
RealD	B-Algorithm
3D	I-Algorithm
is	O
a	O
digital	O
stereoscopic	B-Algorithm
projection	O
technology	O
made	O
and	O
sold	O
by	O
RealD	O
.	O
</s>
<s>
It	O
is	O
currently	O
the	O
most	O
widely	O
used	O
technology	O
for	O
watching	O
3D	B-Algorithm
films	I-Algorithm
in	O
theaters	O
.	O
</s>
<s>
Worldwide	O
,	O
RealD	B-Algorithm
3D	I-Algorithm
is	O
installed	O
in	O
more	O
than	O
26,500	O
auditoriums	O
by	O
approximately	O
1,200	O
exhibitors	O
in	O
72	O
countries	O
as	O
of	O
June	O
2015	O
.	O
</s>
<s>
RealD	B-Algorithm
3D	I-Algorithm
cinema	O
technology	O
is	O
a	O
polarized	B-Algorithm
3D	I-Algorithm
system	I-Algorithm
that	O
uses	O
circularly	O
polarized	O
light	O
to	O
produce	O
stereoscopic	B-Algorithm
image	I-Algorithm
projection	O
.	O
</s>
<s>
However	O
,	O
as	O
with	O
other	O
systems	O
,	O
any	O
significant	O
head	O
tilt	O
will	O
result	O
in	O
incorrect	O
parallax	B-Device
and	O
prevent	O
the	O
brain	O
from	O
correctly	O
fusing	O
the	O
stereoscopic	B-Algorithm
images	I-Algorithm
.	O
</s>
<s>
The	O
high-resolution	O
,	O
digital	O
cinema	O
grade	O
video	B-Device
projector	I-Device
alternately	O
projects	O
right-eye	O
frames	O
and	O
left-eye	O
frames	O
,	O
switching	O
between	O
them	O
144	O
times	O
per	O
second	O
.	O
</s>
<s>
The	O
projector	O
is	O
either	O
a	O
Texas	O
Instruments	O
Digital	B-General_Concept
Light	I-General_Concept
Processing	I-General_Concept
device	O
or	O
Sony	O
's	O
reflective	O
LCOS	B-Device
(	O
liquid	B-Device
crystal	I-Device
on	I-Device
silicon	I-Device
)	O
.	O
</s>
<s>
A	O
push-pull	O
electro-optical	O
liquid	B-Device
crystal	I-Device
modulator	O
called	O
a	O
ZScreen	B-Algorithm
is	O
placed	O
immediately	O
in	O
front	O
of	O
the	O
projector	O
lens	O
to	O
alternately	O
polarize	O
each	O
frame	O
.	O
</s>
<s>
In	O
RealD	B-Algorithm
Cinema	I-Algorithm
,	O
each	O
frame	O
is	O
projected	O
three	O
times	O
to	O
reduce	O
flicker	O
,	O
a	O
system	O
called	O
triple	O
flash	O
.	O
</s>
