The rumored dark mode of Apple's ios 13 system is very power-saving and the principle is the same. So can the mobile phone wallpaper be set to black to save electricity? Many users say it is effective, and some users say it is invalid. Today I will tell you how it works.

If only one pixel on the whole screen needs to emit light, the backlight must still work at full capacity for the LCD screen. On the OLED screen, as long as one pixel is lit, all other pixels can be turned off, so black wallpaper will save more electricity than other colors. The black part of wallpaper will save electricity.