<s>
A	O
Projection	B-General_Concept
panel	I-General_Concept
(	O
also	O
called	O
overhead	B-General_Concept
display	I-General_Concept
or	O
LCD	B-Device
panel	I-Device
)	O
is	O
a	O
device	O
that	O
,	O
although	O
no	O
longer	O
in	O
production	O
,	O
was	O
used	O
as	O
a	O
data	B-Device
projector	I-Device
is	O
today	O
.	O
</s>
<s>
It	O
works	O
with	O
an	O
overhead	B-Device
projector	I-Device
.	O
</s>
<s>
The	O
panel	O
consists	O
of	O
a	O
translucent	O
LCD	B-Device
,	O
and	O
a	O
fan	O
to	O
keep	O
it	O
cool	O
.	O
</s>
<s>
The	O
projection	B-General_Concept
panel	I-General_Concept
sits	O
on	O
the	O
bed	O
of	O
the	O
overhead	B-Device
projector	I-Device
,	O
and	O
acts	O
like	O
a	O
piece	O
of	O
transparency	O
.	O
</s>
<s>
The	O
panels	O
have	O
a	O
VGA	B-Protocol
input	O
,	O
and	O
sometimes	O
Composite	O
(	O
RCA	O
)	O
and	O
S-Video	O
input	O
.	O
</s>
<s>
Proxima	O
,	O
one	O
maker	O
of	O
the	O
panels	O
,	O
included	O
a	O
magic	B-Application
wand	I-Application
and	O
sensor	O
,	O
which	O
worked	O
with	O
the	O
sensor	O
detecting	O
where	O
you	O
put	O
the	O
wand	O
,	O
to	O
create	O
and	O
interactive	O
effect	O
,	O
the	O
equivalent	O
of	O
today	O
's	O
smart	O
boards	O
.	O
</s>
<s>
Although	O
they	O
are	O
not	O
produced	O
anymore	O
,	O
used	O
panels	O
can	O
be	O
purchased	O
for	O
a	O
fraction	O
of	O
the	O
price	O
of	O
a	O
data	B-Device
projector	I-Device
.	O
</s>
<s>
The	O
panels	O
are	O
quite	O
dim	O
,	O
as	O
they	O
do	O
not	O
let	O
a	O
great	O
deal	O
of	O
light	O
through	O
,	O
so	O
brightness	O
can	O
be	O
a	O
problem	O
,	O
even	O
with	O
a	O
powerful	O
overhead	B-Device
projector	I-Device
.	O
</s>
