<s>
The	O
Hitachi	B-Device
DX07	I-Device
is	O
a	O
2.9	O
inch	O
(	O
73	O
mm	O
)	O
liquid	B-Device
crystal	I-Device
display	I-Device
screen	O
which	O
went	O
into	O
mass	O
production	O
in	O
December	O
2006	O
:	O
</s>
<s>
Each	O
pixel	B-Algorithm
is	O
therefore	O
78µm	O
x	O
77µm	O
(	O
1µm	O
=	O
1/1000mm	O
)	O
.	O
</s>
<s>
The	O
smallest	O
visible	O
pixel	B-Algorithm
size	O
(	O
p	O
)	O
for	O
a	O
hand	O
held	O
device	O
can	O
be	O
calculated	O
assuming	O
the	O
screen	O
is	O
held	O
at	O
a	O
comfortable	O
distance	O
(	O
250mm	O
)	O
for	O
someone	O
with	O
"	O
normal	O
"	O
vision	O
(	O
able	O
to	O
see	O
detail	O
at	O
a	O
1/60	O
degree	O
angle	O
)	O
:	O
</s>
<s>
It	O
can	O
therefore	O
be	O
concluded	O
that	O
the	O
pixel	B-Algorithm
size	O
for	O
the	O
Hitachi	B-Device
DX07	I-Device
screen	O
is	O
only	O
5%	O
greater	O
than	O
the	O
smallest	O
possible	O
for	O
practical	O
use	O
.	O
</s>
<s>
72.7µm	O
pixels	B-Algorithm
)	O
would	O
be	O
as	O
follows	O
:	O
</s>
