Phone that charges by itself when in stanby…WIP?

Interesting ways by which a phone can charge by itself...Like it, when we will see this out in market is a matter of time I guess :)

Nokia's self phone charging prototype in works?...

• New talked about prototype - self charging system from Nokia that is able to power itself on nothing more than ambient radiowaves – the weak TV, radio and mobile phone signals that permanently surround us. The power harvested is small but it is almost enough to power a mobile in standby mode indefinitely without ever needing to plug it into the mains, according to Markku Rouvala, one of the researchers who developed the device at the Nokia Research Centre in Cambridge, UK.
• Nokia's device is somewhat less ambitious and is made possible thanks to a wide-band antenna and two very simple circuits. The antenna and the receiver circuit are designed to pick up a wide range of frequencies — from 500 megahertz to 10 gigahertz — and convert the electromagnetic waves into an electrical current, while the second circuit is designed to feed this current to the battery to recharge it.
• The trick here is to ensure that these circuits use less power than is being received, said Rouvala. So far they have been able to harvest up to 5 milliwatts. Their short-term goal is to get in excess of 20 milliwatts, enough power to keep a phone in standby mode indefinitely without having to recharge it. But this would not be enough to actually use the phone to make or receive a call, he says. So ultimately the hope is to be able to get as much as 50 milliwatts which would be sufficient to slowly recharge the battery.

More... http://www.guardian.co.uk/environment/2009/jun/10/nokia-mobile-phone

Power through Solar cells under the screen -
Solar cells can fit just underneath the screen so that it take the source light and convert it into energy that can be consumed to charge the phone....
 

Charge your phone through your heat of the body -

Phones that can use an integrated thermogenerator that converts heat into energy. That means it could get a slight charge while sitting in your pocket against your leg and an even bigger charge when you have a temperature! :)

Dont believe, ALL three above can be "the" single alternate source for self charging phones, but why not all three? Could be a game changer next!

Cheers - DJ