Why is everyone so in love with the night theme and tend to use it as night and day? The fact that it not only reduces the burden on the eye, as it saves battery life on smartphones with AMOLED screens. So many users have taken as a personal insult, when the developer of their favorite application implemented a night theme, which was not pure black, just gray. Say, in this case, to increase the autonomy of the device will not work. But those who thought so were wrong. And here’s why.
See also: Google told me what is so valuable night theme for Android
Probably, you first need to explain how to operate the AMOLED screens and why the theme of the night is able to reduce power consumption.
How does the AMOLED
The fact that these panels are composed of many independent pixels, which are highlighted in red, blue or green flowers and combining them display any colors and shades other than black. To display it simply extinguishes the display pixels. That is why the black color on AMOLED screens looks really black and not dark grey like IPS panels, and also consumes less energy, which positively affects the autonomy of the device.
See also: How to enable night theme for all apps at once in Android Q
But that’s not all there is to know about AMOLED screens. Despite the fact that in the formation of all other colors, there are three subpixels, the display of each of them spent different amounts of energy. For example, the demonstration of white all subpixels are lit at 100%, black 0%, and gray – only 0.3%. Such low consumption in the formation of gray color obtained due to the fact that it creates a white screen first, and then just lowers supplied to the LEDs voltage.
How to save battery life
A significant role in comparing the efficiency of black and gray colors, plays the power consumption of each mobile. In the case of OnePlus 7 Pro, which was used as a test device consumed by the display power is generated from the baseline equal to 400 mW and 4 mW for each nits (unit of brightness). Thus, if the display displays a white color at 100 nits, it will consume 800 mW, and if the black – only 400 mW, because at this point the LEDs are not lit. In the case of grey consumption will still only 401,2 mW. It turns out that gray almost as economical as black.
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