Why is my LCD TV such an energy hog?

[NeoPTLD]

I got a 32" 16:9 HDTV and it uses 170watts measured and that's more than my 21" 4:3 CRT.


32" 16:9 = 27.9 x 15.7 = 438in^2

21" 4;3 = 212in^2

So indeed the surface area is a little over twice as large, I was expecting it would use less power than the CRT. My 21" CRT uses around 100W measured.

 

[f95toli]

On an LCD the backlighting panel is always on; that is the reason for the relatively large power consumtion.
But per square inch they are still more energy efficient than CRTs.

 

[The Boston Dangler]

btw, energy star approval applies only to standby mode. in on mode, anything goes, and it still gets it's sticker

 

[ThingyNess]

Also, because of the polarizers in an LCD panel, as little as 1/5 of the light generated by the backlight actually makes it through the panel as light to reach your eyes. The rest is absorbed internally and radiated as heat.

 

[wwswimming]

i'm using a 27" samsung as a computer monitor.

right now it has the windows XP icon as a screensaver.

anybody know about how much energy that uses ?

when the monitor has the XP desktop, it lights up the whole
room. i can see how that consumes about 170 watts.

my samsung 17" was 40 watts on, about 4 watts in "sleep" mode.