Submission + - Microsoft Researchers Explore Using Light Rays To Charge Smartphones (hothardware.com)
MojoKid writes: Making wireless charging a viable thing is far from being a new goal, but to date, no method has caught on in a big way. Microsoft might have an alternative solution that involves light rays, but not solar pads. Because indoor light is so weak compared to outdoor light, it's not realistic to rely on those light rays to charge a device. So, Microsoft built its own charger, in the form of a light fixture. Equipped with a high-powered LED flashlight, whenever this light fixture detects a compatible device kicking around, it'll begin beaming light straight at it. However, a big problem arises here immediately: no one is likely to want a light randomly pointing at their phone. It's mentioned that infrared lights could be used down-the-road to fix that problem. Also, this charger won't simply continue to charge a device when its battery is full. Via an on-phone LED, the mobile device would handshake with the light source, and either charge or not charge depending on the battery-level.