What Does Dark Mode Do to Battery?

Dark mode can save battery, but only meaningfully on phones with OLED or AMOLED screens, and mostly at higher brightness. On those screens black pixels are switched off, so darker interfaces use less power. On older LCD screens dark mode saves little or nothing because the backlight stays on regardless. On most phones the real-world saving is modest, not dramatic.

Why this happens

The effect comes down to how different screens make light.

• OLED and AMOLED screens light each pixel individually, so a black pixel is simply off and draws almost no power. More dark area means less energy used.
• LCD screens use one backlight behind the whole panel that stays on for both light and dark colors, so dark mode barely changes their power use.
• The brighter the screen, the bigger the difference dark mode makes on OLED, because bright white pixels are what cost the most.

Is this normal?

Yes. It is normal for dark mode to help battery on some phones and do little on others. Most flagship phones use OLED, while many budget phones and older models use LCD.

Does it cause any problems?

No. Dark mode is safe and can also reduce eye strain in low light and limit blue light at night. The only downsides are personal preference and that some text can be harder to read for certain people.

How to fix or check it

1. On Android, open Settings, then Display, and turn on Dark theme, or schedule it for sunset to sunrise.
2. On iPhone, open Settings, then Display and Brightness, and choose Dark, or turn on Automatic to switch by time.
3. To find your screen type, check the phone's specifications online for the words OLED, AMOLED, or LCD.
4. To save more battery on OLED, also lower brightness and use a mostly black wallpaper.
5. Enable dark mode inside individual apps too, since some apps have their own setting.
6. On Windows and Mac, dark mode is a visual preference and has little battery effect on typical LCD laptop screens.

Frequently asked questions

How much battery does dark mode actually save?

On an OLED phone at high brightness, tests have shown meaningful savings for the screen, sometimes in the range of 10 to 30 percent. At low brightness or on LCD screens the saving is small.

Does dark mode help on an LCD phone?

Barely. LCD screens keep the backlight on for all colors, so dark mode saves little power on them, though some people still prefer how it looks.

Is dark mode better for my eyes?

It can be more comfortable in dark rooms and reduces glare, but in bright surroundings light mode may actually be easier to read. It is largely down to personal comfort.