Jim Mielke's concept would be implanted beneath the skin on your arm. It then taps into your bloodstream, converting the oxygen and glucose into electric power. The display then "works" by changing the color of smart-ink pixels tattooed over the implant. It also acts as a touchscreen input device, so you could manage your cellphone calls by tapping on your arm. Most creepily, there's potential for a 3G video call to be shown on your skin.
What with this blood-powered idea, the urine rubber and the blood pen, there's clearly a rich vein (ahem) of bodily-fluid-related ideas out there for inventors to tap into. Let's hope this one remains just a concept, though: I'd hate to have to shave my arm to get good quality video from my tattoo.
The Digital Tattoo Interface was another entry in the Greener Design Competition that the gravity lamp won second place in. It's an electronic interface embedded under the skin that looks like a tattoo. It's nuts. You could use it as a phone, computer, or traditional tattoo by downloading a picture of a unicorn from the internet. It runs on blood by turning glucose and oxygen into electricity. I don't trust it. Mostly because Jim Mielke, the man responsible for the concept, ends his spiel with "This product is waterproof and powered by pizza." Now get real Jim, who's going to believe that? Everybody who isn't a raving lunatic knows a digital tattoo interface can't run on pizza. Spaghetti-O's maybe, but pizza? You so crazy.
Two more pictures with words after the hop.