Kyrocera - a company known for making durable phones for use in rugged environments - is incorporating solar power technology developed by Sunpartner into their smartphones.
A transparent layer called Wysips is placed under the touchscreen and uses solar energy to charge the phone battery. As the layer is only 0.1mm thick, it does not affect the look or feel of the phone. Sunpartner's system can also be scaled for use in both smartwatches and tablets.
The amount of power generated by the Wysips screen is not yet enough to fully charge a smartphone, but it can significantly help slow battery drain, making for a useful emergency option in remote areas.