Reshared post from +EuroTech
Integrating solar power into your smartphone
Capturing wasted energy within the smartphone display ecosystem
The fact is that smartphones (and all other computer displays) are not very efficient. 36% of OLED lighting goes into illuminating what you see, and the rest goes to waste. So, why not put that energy to good use – for example, to recharge your phone? That's exactly what a team of Cambridge researchers have accomplished.
A photovoltaic film behind the screen captures wasted LED light and converts it back into energy. Since OLED displays are partially transparent, this system also traps some of the incoming sunlight. Additional energy-harvesting techniques and refinements may lead to a solution that extends battery life for a few hours – and perhaps in the future, a smartphone system that doesn't need to be plugged in at all.
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Smartphone screens with built-in solar cells | ExtremeTech
An ingenious researcher at the London Centre for Nanotechnology has managed to squeeze a photovoltaic (solar power) cell into a very interesting location: Behind your smartphone’s display.