<s>
ZScreen	B-Algorithm
is	O
a	O
push-pull	O
electro-optical	O
liquid	O
crystal	O
modulator	O
that	O
is	O
placed	O
immediately	O
in	O
front	O
of	O
the	O
projector	O
lens	O
or	O
computer	O
screen	O
to	O
alternately	O
polarize	O
the	O
light	O
from	O
each	O
video	O
frame	O
.	O
</s>
<s>
The	O
RealD	B-Algorithm
3D	I-Algorithm
system	O
now	O
showing	O
in	O
theaters	O
is	O
using	O
the	O
ZScreen	B-Algorithm
that	O
was	O
invented	O
by	O
Lenny	O
Lipton	O
.	O
</s>
