Why and how a black wallpaper save battery?

There are many ways to improve the autonomy of a smartphone, you may have already heard of the trick of a black background, meant to improve the battery of a mobile. It explains how and why a dark screen actually saves the battery and to what extent it is effective.

Battery life: AMOLED vs LCD

The vast majority of Android smartphones have AMOLED or LCD IPS displays. We have already explained the difference between the two in this guide: All the differences between LCD, TFT, IPS, AMOLED and Retina. The technical differences between the two technologies influence the effectiveness of the tip of a black background.

To summarize, if your smartphone has an AMOLED panel, then it is best to use a black background and dark themes in applications and menus, if possible. According to an experiment made by a user and posted on XDA Developers, an AMOLED display 20% brightness consumes battery 6% per hour. With the brightness to maximum, consumption rose to 8% per hour. Of course, these results were obtained with a constantly lit display.

A black screen for saving the battery, simply.

The principle of AMOLED technology is that the LEDs do not emit light when they appear black. LCDs do not have this advantage because the LEDs are lit, the displayed color is black or not. For IPS panels, the black background therefore is absolutely worthless.

Where a black background?


If your smartphone has an AMOLED display, this trick can be useful.

To find a black wallpaper, you can do like me and take a picture by blocking the sensor and the display will be black. Otherwise, you can download this picture.

All this also confirms that the use of a dark theme in an application where the system in general can affect your independence. Word to the wise!

Do you practice already the black background? You know other tricks to save battery?

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