<s>
An	O
aperture	B-General_Concept
grille	I-General_Concept
is	O
one	O
of	O
two	O
major	O
technologies	O
used	O
to	O
manufacture	O
color	O
cathode-ray	B-Device
tube	I-Device
(	O
CRT	O
)	O
televisions	O
and	O
computer	B-Device
displays	I-Device
;	O
the	O
other	O
is	O
the	O
shadow	B-General_Concept
mask	I-General_Concept
.	O
</s>
<s>
The	O
fine	O
wires	O
allow	O
for	O
a	O
finer	O
dot	O
pitch	O
as	O
they	O
can	O
be	O
spaced	O
much	O
closer	O
together	O
than	O
the	O
perforations	O
of	O
a	O
shadow	B-General_Concept
mask	I-General_Concept
,	O
and	O
there	O
need	O
be	O
no	O
gap	O
between	O
adjacent	O
horizontal	O
pixels	O
.	O
</s>
<s>
During	O
the	O
display	O
of	O
bright	O
images	O
,	O
a	O
shadow	B-General_Concept
mask	I-General_Concept
warms	O
,	O
and	O
expands	O
outward	O
in	O
all	O
directions	O
(	O
sometimes	O
called	O
blooming	O
)	O
.	O
</s>
<s>
Aperture	B-General_Concept
grilles	I-General_Concept
do	O
not	O
exhibit	O
this	O
behavior	O
;	O
when	O
the	O
wires	O
heat	O
up	O
,	O
they	O
expand	O
vertically	O
.	O
</s>
<s>
The	O
vertical	O
wires	O
of	O
the	O
aperture	B-General_Concept
grille	I-General_Concept
have	O
a	O
resonant	O
frequency	O
and	O
will	O
vibrate	O
in	O
sympathetic	O
resonance	O
with	O
loud	O
sounds	O
near	O
the	O
display	O
,	O
resulting	O
in	O
fluttering	O
and	O
shimmering	O
of	O
colors	O
on	O
the	O
display	O
.	O
</s>
<s>
These	O
stabilizing	O
wires	O
provide	O
the	O
easiest	O
way	O
to	O
distinguish	O
aperture	B-General_Concept
grille	I-General_Concept
and	O
shadow	B-General_Concept
mask	I-General_Concept
displays	O
at	O
a	O
glance	O
.	O
</s>
<s>
Additionally	O
,	O
aperture	B-General_Concept
grille	I-General_Concept
displays	O
tend	O
to	O
be	O
vertically	O
flat	O
and	O
are	O
often	O
horizontally	O
flat	O
as	O
well	O
,	O
while	O
shadow	B-General_Concept
mask	I-General_Concept
displays	O
usually	O
have	O
a	O
spherical	B-Application
curvature	O
.	O
</s>
<s>
The	O
first	O
patented	O
aperture	B-General_Concept
grille	I-General_Concept
televisions	O
were	O
manufactured	O
by	O
Sony	O
in	O
the	O
late	O
1960s	O
under	O
the	O
Trinitron	O
brand	O
name	O
,	O
which	O
the	O
company	O
carried	O
over	O
to	O
its	O
line	O
of	O
CRT	O
computer	B-Device
monitors	I-Device
.	O
</s>
<s>
Aperture	B-General_Concept
grilles	I-General_Concept
are	O
not	O
as	O
mechanically	O
stable	O
as	O
shadow	O
or	O
slot	O
masks	O
;	O
a	O
tap	O
can	O
cause	O
the	O
image	O
to	O
briefly	O
become	O
distorted	O
,	O
even	O
with	O
damping/support	O
wires	O
.	O
</s>
