3M is demonstrating a prototype projector small enough to fit inside a mobile phone or digital camera, at this year's International Consumer Electronics Show.

The mobile projector is about a 1cm thick and about 4cn tall by 3cm wide - small enough to fit inside portable devices such as mobile phones, PDAs or a digital still camera, said Todd Rutherford, product development specialist with 3M's optical systems division.

It uses an LED as the light source and can project a VGA resolution (640 pixels by 480 pixels) image through a lens that's about 1cm in diameter.

3M is demonstrating the projector at CES built into a small handheld device that runs video from flash memory. The image projected onto walls or other light surfaces was good enough and easy enough to see over a distance of about half a metre, although it suffered over greater distances due to the bright lights of the show floor.

The demo attracted a lot of attention and a constant stream of show attendees, many of whom had badges identifying them as employees of mobile phone makers or network operators.

3M is already working with companies interested in embedding the projector in devices, and the first products should be out in early 2008, said Rutherford. He wouldn't identify the companies or the applications but said that they are mobile consumer electronics products. Mobile Advisor brings you the latest reviews of mobile phones and mobile phone products.