<s>
The	O
Heliodisplay	B-General_Concept
is	O
an	O
air-based	O
display	O
using	O
principally	O
air	O
that	O
is	O
already	O
present	O
in	O
the	O
operating	O
environment	O
(	O
room	O
or	O
space	O
)	O
.	O
</s>
<s>
As	O
dark	O
areas	O
of	O
the	O
image	O
may	O
appear	O
invisible	O
,	O
the	O
image	O
may	O
be	O
more	O
realistic	O
than	O
on	O
a	O
projection	O
screen	O
,	O
although	O
it	O
is	O
still	O
not	O
volumetric	B-Algorithm
.	O
</s>
<s>
Heliodisplay	B-General_Concept
can	O
operate	O
as	O
a	O
free-space	O
touchscreen	B-Device
when	O
the	O
equipment	O
is	O
ordered	O
as	O
an	O
interactive	O
unit	O
with	O
embedded	O
sensors	O
in	O
the	O
equipment	O
.	O
</s>
<s>
The	O
original	O
prototype	O
of	O
2001	O
used	O
a	O
PC	O
that	O
sees	O
the	O
Heliodisplay	B-General_Concept
as	O
a	O
pointing	O
device	O
,	O
like	O
a	O
mouse	O
.	O
</s>
<s>
The	O
interactive	O
version	O
(	O
"	O
i	O
"	O
)	O
of	O
the	O
heliodisplay	B-General_Concept
contains	O
an	O
embedded	O
processor	O
that	O
controls	O
these	O
functions	O
internally	O
for	O
single	O
touch	O
,	O
or	O
multiple	O
touch	O
interactivity	O
using	O
an	O
equipment	O
mounted	O
arrangement	O
but	O
without	O
the	O
IR	O
laser	O
field	O
found	O
on	O
the	O
earlier	O
versions	O
.	O
</s>
<s>
The	O
smaller	O
Heliodisplay	B-General_Concept
version	O
is	O
transportable	O
at	O
and	O
is	O
as	O
big	O
as	O
a	O
lunchbox	O
(	O
30	O
cm	O
x	O
30	O
cm	O
x	O
12	O
cm	O
)	O
similar	O
to	O
the	O
2002	O
version	O
.	O
</s>
<s>
The	O
air-based	O
system	O
is	O
formed	O
by	O
a	O
series	O
of	O
metal	O
plates	O
,	O
and	O
the	O
original	O
Heliodisplay	B-General_Concept
could	O
run	O
for	O
several	O
hours	O
although	O
current	O
models	O
can	O
operate	O
continuously	O
.	O
</s>
<s>
2008	O
model	O
Heliodisplays	B-General_Concept
use	O
80ml	O
to	O
120ml	O
of	O
water	O
per	O
hour	O
(	O
most	O
used	O
for	O
cooling	O
)	O
,	O
depending	O
on	O
screen	O
size	O
and	O
user	O
settings	O
,	O
although	O
the	O
medium	O
is	O
primarily	O
air	O
.	O
</s>
<s>
Various	O
versions	O
of	O
the	O
heliodisplay	B-General_Concept
work	O
predominantly	O
from	O
the	O
surrounding	O
air	O
(	O
such	O
as	O
under	O
museum	O
environments	O
)	O
where	O
there	O
are	O
negligible	O
affect	O
to	O
the	O
surrounding	O
space	O
.	O
</s>
<s>
The	O
Heliodisplay	B-General_Concept
was	O
invented	O
by	O
Mr.	O
Dyner	O
,	O
who	O
built	O
it	O
as	O
a	O
five-inch	O
interactive	O
prototype	O
in	O
2000-2001	O
before	O
patenting	O
the	O
free-space	O
display	O
technology	O
.	O
</s>
<s>
The	O
Heliodisplay	B-General_Concept
is	O
sold	O
directly	O
worldwide	O
by	O
IO2	O
Technology	O
with	O
offices	O
in	O
The	O
Bay	O
Area	O
of	O
Northern	O
California	O
.	O
</s>
<s>
These	O
are	O
the	O
first	O
Heliodisplay	B-General_Concept
developed	O
by	O
the	O
IO2	O
Technology	O
.	O
</s>
<s>
This	O
first	O
generation	O
Heliodisplay	B-General_Concept
supported	O
only	O
a	O
22	O
”	O
image	O
and	O
utilized	O
an	O
IR	O
light	O
source	O
and	O
an	O
IR	O
camera	O
to	O
track	O
the	O
position	O
of	O
a	O
finger	O
for	O
cursor	O
controlling	O
the	O
images	O
.	O
</s>
<s>
The	O
second-generation	O
M2	O
Heliodisplay	B-General_Concept
supports	O
a	O
30	O
"	O
image	O
with	O
16.7	O
million	O
colours	O
and	O
a	O
2000:1	O
contrast	O
ratio	O
.	O
</s>
<s>
The	O
interactive	O
M2i	O
version	O
includes	O
virtual	O
touchscreen	B-Device
capability	O
.	O
</s>
<s>
In	O
late	O
2007	O
,	O
IO2	O
Technology	O
introduced	O
two	O
larger	O
Heliodisplays	B-General_Concept
,	O
the	O
M50	O
and	O
M100	O
.	O
</s>
<s>
In	O
2011	O
IO2	O
reintroduced	O
the	O
smaller	O
format	O
Heliodisplays	B-General_Concept
along	O
with	O
the	O
standard	O
L(large )	O
models	O
that	O
project	O
approximately	O
2	O
meter	O
tall	O
image	O
(	O
for	O
lifesize	O
person	O
projections	O
)	O
.	O
</s>
