Updated

Updated · CNET · Jul 15

OLED Phone Users Can Cut Battery Drain With Dark Mode as 87% of US Smartphones Use the Screens

Updated

Updated · CNET · Jul 15

OLED Phone Users Can Cut Battery Drain With Dark Mode as 87% of US Smartphones Use the Screens

Q: Is dark mode a genuine solution, or a way for manufacturers to shift battery responsibility onto the user?

Dark mode is a genuine, but limited, battery-saving tool—not a substitute for better batteries or more efficient phones. The evidence is clear on OLED and AMOLED screens, which make up roughly 87% of U.S. smartphones. Because each pixel lights itself, black pixels use very little power. IEEE-cited figures put black at about 250 mW versus roughly 1,250 mW for white. A Purdue study found dark mode cuts power use by only about 3% to 9% at typical indoor brightness, but by 39% to 47% at full brightness, where screens draw much more power. App-level tests have shown even larger savings in some cases, such as Google Maps and YouTube at maximum brightness. That means dark mode is real help, especially outdoors, on bright screens, and for people who spend hours in high-display-use apps. A dark wallpaper can add a small extra gain. But it is not a cure-all. It does little for LCD phones, and on OLED devices the benefit depends heavily on brightness and what apps display. It also does nothing to solve battery aging, which is driven by lithium-ion degradation, heat, charging habits, and longer ownership cycles. So the larger responsibility still sits with manufacturers. Bigger batteries, more efficient chips, better thermal design, repairability, and affordable battery replacement matter far more over a phone’s lifespan. Dark mode is best understood as a useful user-side optimization, not an excuse for weak battery design.

3 articles · Updated · CNET · Jul 15

58% of smartphone owners say they are frustrated with battery life, and the guide says OLED users can stretch a charge by enabling dark mode and using a black or dark-gray wallpaper.
OLED panels light pixels individually rather than through a constant backlight, letting black areas use far less power; one IEEE paper cited black at about 250 mW versus roughly 1,250 mW for white.
The savings become more noticeable at high brightness, especially in direct sunlight, when dark interfaces consume significantly less power than light mode on OLED displays.
A 2025 University North, Croatia study cited in the guide found dark gray #121212 reduced reading errors, suggesting it may balance battery efficiency with readability better than pure black.
The article says the settings are available on current iPhones and most Android phones with OLED or AMOLED screens, which Counterpoint estimates account for about 87% of US smartphones.