Instead of carrying around another device for charging a battery, Apple is trying to integrate solar cells directly into the device. To make the device as unobtrusive as possible, electricity generating cells are placed under the device’s display (a semitransparent display with a solar cell underneath). The device's cover is connected to the solar cell layer to enable solar powered charging. This integration allows charging from sunlight without having to plug in a separate solar panel.
Apple patent applications also describe the use of multiple solar panels that connects the data processing system and memory. On the back of some devices a solar panel could be placed to feed a rechargeable battery.
Motorola is also attempting to build displays that allow sunlight to charge devices. These devices are most-likely to include AC adapters for standard charging. Of course these charging methods will rely on the sun shining, so if it’s dark out, you’re out of luck.
http://news.cnet.com/8301-11128_3-9952341-54.html
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