question about background picture

Discussion in 'Microsoft Surface Pro 3' started by RémiM, Jan 3, 2015.

  1. RémiM

    RémiM Active Member

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    Hi all,

    I have a question, a little weird I have to admit.

    When you use a full black background, like a solid color, all the pixels are set to black. Does it make a difference in term of energy spent compared to whatever picture that has million colors ?

    I am not trying to save battery or whatever, dont worry. It's just for my personal information.

    Thanks !
     
  2. silkrooster

    silkrooster Member

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    Technically it it could affect it. If the color is a value of 255 for red, green or blue channel, a combination of the three, or white the battery would drain faster than a pure black screen. But the brightness value is also a factor.
     
  3. sharpuser

    sharpuser Super Moderator Staff Member

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    Yes, in simple terms, darker colors use less energy, and dimmer screens use less energy.

    I once had a dark, dim, Dell laptop. Good thing, because the battery was weak, too. ;)
     
  4. RémiM

    RémiM Active Member

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    Thank you for your answers !
     
  5. ptrkhh

    ptrkhh Active Member

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    No, color doesn't matter at all. If you want to reduce the power consumption, you need to reduce the brightness from the settings charm.

    Take note though, display brightness don't really matter in term of power consumption. The difference between the brightest and dimmest is only about 15% of the battery. And the dimmest setting is really really dim.

    Im afraid that this kind of LCD panel doesn't work that way. With the same setting of backlight brightness, the color on display doesn't make any difference at all. Black is basically just blocking the backlight as much as possible, but the backlight stays on with the same level nonetheless.
    That's not the case for AMOLED though.
     
    Last edited: Jan 3, 2015
  6. RémiM

    RémiM Active Member

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    Well, it's interesting to read another point of view. Thank you @ptrkhh .

    I knew that the brightness was affecting the power consumption. But when you say that the difference between the brightest and the dimmest setting is about 15% of the battery, to me it sounds to be a lot, doesnt it ?
     
  7. daniielrp

    daniielrp Active Member

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    ^^This.

    The colour won't affect battery unless it is an AMOLED screen.

    A Nokia Windows Phone with an AMOLED screen for example does not illuminate black colours, that pixel just stays off, and therefore does not use as much power when display black colours (though I'm not sure all AMOLEDs do behave this way).
     
  8. ptrkhh

    ptrkhh Active Member

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    You're welcome :)

    Well, you're not going to use the SP3 with the lowest brightness is bright area and vice versa.

    Take an example, in my room, I could only use 40-70% brightness comfortably, otherwise my eyes would be tired. The difference of battery life between 40% and 70% brightness is just about 5% in this case, and that's true in most cases, where only about 30% (70-40=30) of the brightness level could be used comfortably at one particular environment.
     
  9. sharpuser

    sharpuser Super Moderator Staff Member

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    Thanks for the correction on color and power consumption. I was wrong.
     
  10. silkrooster

    silkrooster Member

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    Interesting, I did not know it used a backlight. I was thinking of a normal led screen. But that would explain the other thread, about getting headaches from looking at the screen.
    Learning something new every day. Apologies for any misguidance.
     

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