Dan_Dilger

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  • For space grey MacBook Pro with Touch Bar, Mojave Dark Mode is the new Aqua

    Dan_DilgerDan_Dilger
    curmi said:
    Dark mode isn't Black mode. The windows are grey, not true black, so I'm not sure the "OLED is coming" reasoning is right, as I think grey doesn't save much energy compared with true black, as the LEDs have to be on to do grey.

    No, OLED power consumption is roughly linear with the brightness level of pixels.

    https://senk9.wordpress.com/2015/05/24/thoughts-amoled-power-consumption-tested-and-explored/

    So while black pixels are the most efficient, darker display elements have a big impact on average display power consumption (which is important because the screen uses up as much a 80-90% of a phone's overall power draw!). At 100% white, OLED actually consumes more power than an LED screen.

    Note that as a screen gets brighter, its power consumption also jumps up dramatically when you start reaching full brightness. "100% brightness setting consumes more than 5.4x the power of 0% brightness setting, to produce 30x the brightness. However, 100% brightness consumes 1.7x more power than 80% brightness, to produce only 1.2x more light."

    APL (Average Picture Level) of content changes on what you're watching. Movies are around 40% APL, while mostly white web pages are closer to 80%. So when you see battery tests stipulating that they played a movie until the battery died, it doesn't mean you'll get the same results browsing the web. 

    A light UI consumes about 50% more power than a mostly black screen. The study compared Android 4.4's dark Holo appearance with the much lighter Material Design. This impacted battery life significantly. 

    Also, specific colors use more power (due to the efficiency differences across colors of LEDs). So blue eats up ~30% more power than green. That likely factors into the reduced power consumption of iOS Night Shift, which scales blue light back.





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