A small company called Wysips has created the world’s first photovoltaic screen protector. The super-thin (less than 100 microns!) covering would go over the screen of your phone (or tablet, or iPod touch, or ebook reader) and constantly supply the battery with solar power.
You would still be able to use the device’s touch screen unhindered – in fact, the performance of your device would be totally unchanged. The typical smartphone could charge completely in six hours under direct sunlight, or longer under indoor light. But even more exciting is the fact that the covering would constantly top-up your phone’s battery, meaning that you have to charge via a wall plug much less often.