Published: 12:34 EST,
February 21, 2008
TATTOO DISPLAY RUNS ON BLOOD
By Lisa Zyga
Jim Mielke's wireless
blood-fueled display is a true merging of technology and body art. At the recent Greener Gadgets Design Competition, the engineer
demonstrated a subcutaneously implanted touch-screen that operates as a cell phone display, with the potential for 3G video
calls that are visible just underneath the skin.
The basis of the 2x4-inch
"Digital Tattoo Interface" is a Bluetooth device made of thin, flexible silicon and silicone. Itīs inserted through a small
incision as a tightly rolled tube, and then it unfurls beneath the skin to align between skin and muscle. Through the same
incision, two small tubes on the device are attached to an artery and a vein to allow the blood to flow to a coin-sized blood
fuel cell that converts glucose and oxygen to electricity. After blood flows in from the artery to the fuel cell, it flows
out again through the vein.
On both the top and bottom surfaces of the display is a matching
matrix of field-producing pixels. The top surface also enables touch-screen control through the skin. Instead of ink, the
display uses tiny microscopic spheres, somewhat similar to tattoo ink. A field-sensitive material in the spheres changes their
color from clear to black, aligned with the matrix fields.
The tattoo display communicates wirelessly to other Bluetooth
devices - both in the outside world and within the same body. Although the device is always on (as long as your bloodīs flowing),
the display can be turned off and on by pushing a small dot on the skin. When the phone rings, for example, an individual
turns the display on, and "the tattoo comes to life as a digital video of the caller," Mielke explains. When the call ends,
the tattoo disappears.
Could such an invasive device have harmful biological effects? Actually, the device could offer
health benefits. Thatīs because it also continually monitors for many blood disorders, alerting the person of a health problem.
The tattoo display is still just a concept, with no word on plans for commercialization.
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