1. LennonK's Avatar
    Hi,
    recently I bought me a Samsung S7. One reason was the OLED-display, but during some tests I noticed that a black screen use the same energy such as a white screen. I dont understand this, I thought that the display turn off the black pixels. I also tested apps like Pixel Filter (generate a grid of black pixels on the screen) and I measured the consumption of the display (used the calculted power consumption in the settings), but there is no difference. Always nearly the same values and it does not matter if I turn the filter on or off. But I am really sure that is an OLED, because the black parts are dark like turn off the screen but I don't see this in the battery usage of the device. Does anyone know why my OLED-display don't saves energy by applications like pixel filter?
    I_didnt_do_it likes this.
    05-04-2018 12:35 PM
  2. Itsa_Me_Mario's Avatar
    For black vs white screen, do you mean using a dark theme?
    05-04-2018 01:10 PM
  3. LennonK's Avatar
    I mean with black and white screen my test. I open a white picture in the gallery and let the screen on and then I open a black picture and let the screen the same time on. After that I compare the power consumption and here is the problem there is no difference.
    05-04-2018 01:56 PM
  4. Itsa_Me_Mario's Avatar
    So one photo is #000000 and the other is #FFFFFF ? Are all the radios and background processes off during this test? And is brightness set at a specific value or is it adaptive?
    05-04-2018 01:59 PM
  5. LennonK's Avatar
    Yes on picture is #000000 and the other is #FFFFFF . I use the calculated power consumption for the display from the battery settings. So it should not matter whether radios are on or off. I use a specific value for the brightness during the test.
    05-04-2018 02:06 PM
  6. SpookDroid's Avatar
    Unless you display a fully black image on the screen vs a fully white one for at least an hour, you're hardly going to notice a significant difference unless you're displaying the white image in full brightness. Best way to do it is to charge phone to 100, plug off, airplane mode on to avoid background data drain, test black image for an hour and note the drain. Charge again to 100, display white for an hour and compare.
    05-04-2018 10:08 PM
  7. AndroidFan3420's Avatar
    Unless you display a fully black image on the screen vs a fully white one for at least an hour, you're hardly going to notice a significant difference unless you're displaying the white image in full brightness. Best way to do it is to charge phone to 100, plug off, airplane mode on to avoid background data drain, test black image for an hour and note the drain. Charge again to 100, display white for an hour and compare.
    Displaying a white screen for one hour? Be careful with burn in
    05-05-2018 02:54 AM

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