<s>
Cromaclear	B-General_Concept
is	O
a	O
trademark	O
for	O
CRT	B-Device
technology	O
used	O
by	O
NEC	O
during	O
the	O
mid	O
to	O
late-90s	O
.	O
</s>
<s>
This	O
adopted	O
the	O
slotted	O
shadow	B-General_Concept
mask	I-General_Concept
and	O
in-line	O
electron	O
gun	O
pioneered	O
by	O
the	O
1966	O
GE	O
Porta-Color	O
and	O
used	O
by	O
most	O
then-current	O
television	O
tubes	O
to	O
computer	O
monitor	O
use	O
.	O
</s>
<s>
It	O
was	O
claimed	O
that	O
Cromaclear	B-General_Concept
could	O
offer	O
the	O
image	O
clarity	O
and	O
sharpness	O
of	O
the	O
Trinitron	O
and	O
Diamondtron	O
aperture	B-General_Concept
grille	I-General_Concept
CRTs	O
without	O
the	O
disadvantages	O
e.g.	O
</s>
<s>
The	O
most	O
significant	O
difference	O
between	O
Cromaclear	B-General_Concept
CRTs	O
and	O
existing	O
CRT	B-Device
computer	O
monitor	O
technologies	O
is	O
their	O
phosphor	O
pattern	O
.	O
</s>
<s>
Older	O
color	O
televisions	O
and	O
most	O
CRT	B-Device
monitors	I-Device
have	O
a	O
pattern	O
of	O
round	O
dots	O
arranged	O
in	O
a	O
triangular	O
mosaic	O
.	O
</s>
<s>
With	O
Cromaclear	B-General_Concept
CRTs	O
,	O
the	O
conventional	O
"	O
dot	O
pitch	O
"	O
measurement	O
is	O
no	O
longer	O
as	O
accurate	O
.	O
</s>
<s>
A	O
mask	O
pitch	O
measurement	O
is	O
the	O
distance	O
between	O
like-colored	O
phosphors	O
on	O
a	O
Cromaclear	B-General_Concept
mask	O
.	O
</s>
<s>
The	O
mask	O
pitch	O
of	O
a	O
Cromaclear	B-General_Concept
screen	O
is	O
0.25mm	O
.	O
</s>
<s>
When	O
discussed	O
in	O
relation	O
to	O
Cromaclear	B-General_Concept
,	O
these	O
items	O
need	O
further	O
explanation	O
.	O
</s>
<s>
Focus	O
:	O
Cromaclear	B-General_Concept
incorporates	O
a	O
new	O
SDF-ELA	O
(	O
Single	O
Dynamic	O
Focus	O
-	O
Expanded	O
Large	O
Aperture	O
)	O
gun	O
for	O
15-inch	O
tubes	O
and	O
DQF	O
-	O
ELA	O
(	O
Dynamic	O
Quadrupole	O
Focus	O
-	O
Expanded	O
Large	O
Aperture	O
)	O
gun	O
for	O
17-inch	O
tubes	O
.	O
</s>
<s>
Using	O
the	O
Cromaclear-specific	O
ELA	O
gun	O
,	O
this	O
problem	O
is	O
virtually	O
eliminated	O
.	O
</s>
<s>
As	O
a	O
consequence	O
of	O
Cromaclear	B-General_Concept
's	O
new	O
mask	O
form	O
,	O
the	O
electron	O
beam	O
used	O
to	O
pass	O
through	O
the	O
slot	O
mask	O
had	O
to	O
be	O
adapted	O
to	O
match	O
.	O
</s>
<s>
The	O
ELA	O
gun	O
utilized	O
for	O
Cromaclear	B-General_Concept
has	O
an	O
exact	O
beam/mask	O
match	O
(	O
an	O
elliptical	O
electron	O
beam	O
passes	O
through	O
an	O
elliptical	O
mask	O
opening	O
)	O
for	O
optimum	O
power	O
transfer	O
from	O
electron	O
beam	O
to	O
screen	O
phosphors	O
.	O
</s>
<s>
Although	O
it	O
was	O
possible	O
to	O
use	O
existing	O
round	O
phosphor	O
gun	O
technology	O
with	O
Cromaclear	B-General_Concept
,	O
a	O
certain	O
percentage	O
of	O
electron	O
power	O
would	O
have	O
been	O
lost	O
,	O
thereby	O
degrading	O
overall	O
image	O
focus	O
.	O
</s>
<s>
This	O
mismatch	O
tends	O
to	O
occur	O
in	O
aperture	B-General_Concept
grille	I-General_Concept
CRTs	O
(	O
stripe	O
grille/circular	O
electron	O
beam	O
)	O
.	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
shadow	B-General_Concept
mask	I-General_Concept
CRTs	O
match	O
a	O
circular	O
beam	O
to	O
a	O
circular	O
shadow	B-General_Concept
mask	I-General_Concept
.	O
</s>
<s>
Convergence	O
is	O
the	O
process	O
of	O
controlling	O
the	O
CRT	B-Device
beam	O
deflection	O
to	O
keep	O
the	O
red	O
,	O
green	O
and	O
blue	O
beams	O
properly	O
overlapped	O
when	O
scanning	O
the	O
raster	O
(	O
area	O
illuminated	O
by	O
the	O
scan	O
lines	O
on	O
a	O
CRT	B-Device
)	O
.	O
</s>
<s>
For	O
example	O
,	O
a	O
CRT	B-Device
monitor	I-Device
with	O
misaligned	O
electron	O
beams	O
will	O
show	O
a	O
white	O
"	O
H	O
"	O
on	O
a	O
black	O
background	O
with	O
one	O
of	O
the	O
primary	O
or	O
secondary	O
colors	O
shadowing	O
its	O
edges	O
.	O
</s>
<s>
Cromaclear	B-General_Concept
provides	O
deterrents	O
to	O
misconvergence	O
,	O
including	O
the	O
ELA	O
guns	O
and	O
their	O
tight	O
mask	O
pitch	O
.	O
</s>
<s>
Aperture	B-General_Concept
grille	I-General_Concept
CRT	B-Device
monitors	I-Device
currently	O
use	O
damping	O
wires	O
to	O
hold	O
the	O
black	O
striping	O
in	O
place	O
between	O
the	O
phosphors	O
.	O
</s>
<s>
Comparatively	O
,	O
Cromaclear	B-General_Concept
utilizes	O
a	O
type	O
of	O
shadow	B-General_Concept
mask	I-General_Concept
that	O
does	O
not	O
require	O
the	O
use	O
of	O
damping	O
wires	O
.	O
</s>
<s>
The	O
Cromaclear	B-General_Concept
shadow	B-General_Concept
mask	I-General_Concept
,	O
however	O
,	O
still	O
has	O
much	O
more	O
impeding	O
metal	O
than	O
an	O
aperture	O
grill	O
mask	O
,	O
leading	O
overall	O
to	O
a	O
darker	O
,	O
softer	O
picture	O
than	O
the	O
equivalent	O
aperture	O
grill	O
CRT	B-Device
.	O
</s>
<s>
The	O
impact	O
of	O
damping	O
wires	O
of	O
the	O
aperture	O
grill	O
CRT	B-Device
,	O
is	O
far	O
less	O
than	O
the	O
total	O
extra	O
metal	O
in	O
the	O
cromaclear	B-General_Concept
mask	O
which	O
is	O
effectively	O
like	O
having	O
a	O
thick	O
damping	O
wire	O
for	O
each	O
row	O
of	O
phosphor	O
.	O
</s>
<s>
This	O
in	O
turn	O
means	O
that	O
the	O
cromaclear	B-General_Concept
CRT	B-Device
needs	O
a	O
much	O
more	O
powerful	O
electron	O
beam	O
to	O
illuminate	O
the	O
phosphors	O
brightly	O
,	O
which	O
reduces	O
the	O
overall	O
life	O
of	O
the	O
CRT	B-Device
and	O
its	O
focusing	O
ability	O
,	O
which	O
is	O
the	O
most	O
expensive	O
part	O
of	O
any	O
CRT	B-Device
monitor	I-Device
or	O
television	O
.	O
</s>
<s>
They	O
also	O
have	O
the	O
potential	O
to	O
be	O
affected	O
by	O
harmonic	O
distortion	O
when	O
speakers	O
are	O
placed	O
near	O
the	O
CRT	B-Device
,	O
however	O
for	O
this	O
to	O
be	O
a	O
visible	O
problem	O
the	O
speakers	O
would	O
need	O
to	O
be	O
impractically	O
close	O
to	O
the	O
screen	O
and	O
producing	O
a	O
very	O
high	O
sound	O
output	O
,	O
so	O
in	O
effect	O
this	O
effect	O
would	O
have	O
to	O
be	O
contrived	O
by	O
speaker	O
position	O
rather	O
than	O
a	O
problem	O
in	O
operation	O
.	O
</s>
<s>
Additionally	O
since	O
aperture	O
grill	O
CRTs	O
have	O
no	O
"	O
horizontal	O
"	O
elements	O
to	O
the	O
shadow	B-General_Concept
mask	I-General_Concept
,	O
the	O
resolution	O
of	O
the	O
CRT	B-Device
in	O
the	O
vertical	O
direction	O
is	O
limited	O
by	O
the	O
focus	O
of	O
the	O
electron	O
beam	O
and	O
the	O
granularity	O
of	O
the	O
phosphor	O
,	O
unlike	O
Cromaclear	B-General_Concept
and	O
other	O
shadow	B-General_Concept
mask	I-General_Concept
based	O
CRTs	O
whose	O
vertical	O
resolution	O
is	O
limited	O
by	O
the	O
number	O
of	O
rows	O
of	O
metal	O
in	O
the	O
mask	O
.	O
</s>
<s>
Cromaclear	B-General_Concept
CRTs	O
improve	O
upon	O
the	O
image	O
sharpness	O
and	O
focus	O
attributed	O
to	O
shadow	B-General_Concept
mask	I-General_Concept
based	O
dot	O
trio	O
CRTs	O
.	O
</s>
