Re: Does your TV heat your face or warm your room?
- From: "JohnR66" <nospam@xxxxxxx>
- Date: Sun, 24 Aug 2008 14:27:19 GMT
<phil-news-nospam@xxxxxxxx> wrote in message
news:g8q9i91dag@xxxxxxxxxxxxxxxxxxxx
On Sat, 23 Aug 2008 01:39:24 GMT JohnR66 <nospam@xxxxxxx> wrote:
| "Chuck Olson" <chuckolson01@xxxxxxxxxxxxxxxxxxxxx> wrote in message
| news:x9ednShG7-V32zHVnZ2dnUVZ_j6dnZ2d@xxxxxxxxxxxxxx
|> One of the features of the most recently developed flat panel TVs is
the
|> rather large amount of electrical power they demand. Some of it goes to
|> produce the gorgeous picture you crave, but most of it is either
radiated
|> out the front, convected out the top or blown out the back.
|>
|> For instance a very popular LCD flat panel pulls almost 300 watts, and
if
|> you want to go to a large screen, LCD, you should be prepared to enjoy
|> over
|> 500 watts of comfy cozy warmth. Some of the Plasma panels approaching
60"
|> pull over 700 watts. Plasma is particularly hoggish compared size to
size
|> against LCD.
|>
|> If you are thinking of replacing a 5-year-old big screen, or moving up
in
|> screen size to something where you can sit back and enjoy the superb
|> detail,
|> and want to keep your power demand down around 120 watts, you might
just
|> look into LCD DLP. Your air conditioner and particularly your wallet
will
|> thank you.
|>
|
| I aways thought LCDs would sip power as I have a handheld game with a
nice
| bright color 2.5" LCD. I measured the power draw to be 40ma at 4.5 volts
| (the cpu uses 20ma for 60ma total). My 17" monitor claims to use 1.2
amps,
| but the case barely gets warm. I don't see it using but 15 or 20 watts.
I do
| keep the brightness down.
|
| Then my parents bought a 52" LCD TV. When I walk by it, I can feel the
heat
| coming off the front. The screen really feels warm to the touch. I was
| surprised to see how much power these big TV's use. Why would that be?
Is it
| the back lighting for the LCD panel?
The 52" screen has 432 times as much area as the 2.5" screen. If the 2.5"
uses
0.09 watts, then the 52" could be expected to use 38.88 watts. That seems
to
not be too bad.
But there are other issues. A game doesn't have to have the contrast
ratio,
better color, and wider angle of view, that a big screen TV needs to have.
These things could mean a liquid crystal technology change that results in
a
greater attenuation of the backlight. That means the backlight has to be
driven much harder. That means more power emitted as light and IR/UV.
And
whatever doesn't pass throgh eventually gets absorbed somewhere (after
being
bounced around, some).
So that might be the big question: are the big screen TVs using a matrix
that
needs more backlight per square inch?
--
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| Phil Howard KA9WGN (email for humans: first name in lower case at
ipal.net) |
I knew someone was going to do the area calaculation for me ;-)
You are correct. The game screen, while bright and colorful straight on (TFT
screen) has a limited viewing angle.
The big screen is a new high end Samsung model. It is very bright and I'm
amazed at how good the viewing angle is without the loss in brightness and
color shifts.
Still, I think the plasma they bought for the basement den is amazing in
picture quality.
.
- References:
- Does your TV heat your face or warm your room?
- From: Chuck Olson
- Re: Does your TV heat your face or warm your room?
- From: JohnR66
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