Fake refresh rates: Is your TV really 120Hz? - CNET Mobile
LG isn't exactly transparent
with its TruMotion tech. The
description reads: "TruMotion
increases the standard 60Hz
refresh rate -- how often the
image is rendered on the TV
screen -- which drastically
reduces blur and yields crisper
details. It's a boon to all fast-
action video, but most
especially sports, so you won't
miss a thing. LG TruMotion
120Hz, 240Hz, or 480Hz is
available on select-model LCD
TVs." Only one TV seems to
have TruMotion 480Hz. The
rest are TruMotion 240 or
TruMotion 120. Their tech
specs typically just say
"Refresh rate: TruMotion
240Hz."
The one LG LED LCD we've
reviewed so far this year, the
60LA8600 , is listed by LG as
"TruMotion (frame rate):
240Hz," and we found out from
LG that it is a 240Hz refresh
panel. On the other hand, last
year's 55LM6700 had a
claimed "240Hz effect" but
actually had worse motion
resolution than some 120Hz
TVs. So don't assume their
numbers describe the panel
refresh.
Samsung CMR
Though Samsung is fantastic
at creative marketing ("LED" TV
was its thing), it at least
doesn't outright call the TVs
with the aforementioned tricks
"480Hz" refresh. Instead, it has
"CMR" or Clear Motion Rate.
"Samsung's more
comprehensive Clear Motion
Rate takes into account all
three factors that contribute to
motion clarity: panel refresh
rate, image processor speed,
and backlight technology." In
other words, a TV with a CMR
of 240 could be a 120Hz panel,
with an average processor, and
a scanning backlight, or a 60Hz
panel, a fancy processor, and a
scanning backlight. It's unlikely
a TV with a CMR of 240 would
be a 240Hz panel, as such an
expensive panel would almost
certainly come with one or both
the other features. Here's an
illustration showing how it gets
the numbers.