Today's smartphones have but only one problem across the board. The battery doesn't last long enough. And with heavy usage like messaging, calling and surfing the web with it and running apps in the background, its hard for the battery to last any longer than more than a day.

Arman Ahnood, a researcher at the London Centre for Nanotechnology has a solution: equip smartphone screens with built in solar cells. 36% of the light produced by an OLED display is projected out and the rest of it is wasted. Instead of letting it go to waste, it can be harnessed with photovoltaic cells built into the screen.

His system has an efficiency of 11% producing a total output of five miliwatts on a typical 3.7 inch device. A typical smartphone uses up to several hundred miliwatts and 68.6 miliwatts in a suspended state.

Would this be able to make a difference? And by how much?

[via ExtremeTech]