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Windows 7: Does it drain more energy when screen is white?

21 Dec 2011   #1
noskas16

Windows 7 ultimate x64
 
 
Does it drain more energy when screen is white?

Hi. I have laptop with 1366x768 LED backlit monitor. I would like to ask, does it drain more energy if wallpaper is white, or it doesn't mater if your wallpaper is white or black, it still will drain same ammount of energy? (I am not talking about brightness, I am talking about colors).
Thanks.


My System SpecsSystem Spec
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21 Dec 2011   #2
Dwarf

Windows 8.1 Pro RTM x64
 
 

There will be a slight increase in energy consumption with white wallpaper as compared to black. This is because the transistors which control the RGB pixels will need to be switched on (and thus use energy) rather than off. The LED backlight will consume the same amount of energy regardless, unless your monitor has dynamic brightness/contrast (in which case the energy consumed by the backlight will vary according to the screen content). Regardless of this, the backlight will be fully energised for a white screen.
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21 Dec 2011   #3
logicearth

Windows 10 Pro (x64)
 
 

Actually it depends how the backlight is. If every pixel has its own LED RGB color then maybe. But if it is just a white LED blacklight that is dispersed across the back then no not really. You can easily test this by putting a completely black background on your screen, if it glows then you have a white LED that disperses across the back of your screen.
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21 Dec 2011   #4
Wishmaster

Windows 7 Home Premium 64bit
 
 

Agree with Dwarf.
In theory it probably would.


Remember, Black is not really a color, but the abscence of all color.
White is the presence of all color.

So for a monitor, the pixel would need to be switched completely off to show Black, and switched completely On to show White.
Any other color such as Blue,Green Yellow etc would be a state somewhere between completely Off and completely ON.


Although Im not sure the difference in power consumption would be much of anything to even worry about. Especially with a LED.
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22 Dec 2011   #5
3D Jed

Windows 7 pro x64 SP1
 
 

A few years ago (before LED screens) there was a project to get people using a black version of Google to save energy. Probably works with CRT monitors . . .

About Blackle - Energy Saving Search
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22 Dec 2011   #6
noskas16

Windows 7 ultimate x64
 
 

Thank you for your answers
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22 Dec 2011   #7
Zepher

Windows 7 Ultimate 64bit
 
 

Dark images consume more power on an LCD screen.
so if your wallpaper is black, you will use more power.
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 Does it drain more energy when screen is white?




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