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A patent was award to Apple in February for a solar touchscreen. This new patent has been associated with a potential watch, as it would provide a power source. In any event, it does sound cool and could be a huge boost for wearable computers.
Here's how it was described in the patent application: "solar cell stack-ups may include electrodes that are used both for collecting solar energy and for sensing on a touch sensor array". Plus, it further says, "the integrated touch sensor and solar panel configurations may also be used for optical sensing".