Head-up displays in cars that comfortably display vehicle information to the driver on the windshield are exciting, but no longer entirely new. However, in contrast, the idea of displaying information to drivers, pilots, or computer gamers directly on contact lenses is very new. A research project at the University of Washington is currently testing the technical requirements and everyday compatibility of such lenses.

The lens prototypes that were developed at the University of Washington have built-in red LEDs (Light Emitting Diodes) and an electronic circuit. Researchers also built ICs made of metal films just a few nanometers thick and, with the help of micro production techniques, produced the LEDs with a diameter of one third of a millimeter. The shape of each one of the tiny components specified which counterpart it would be joined to. In one subtle self-assembly process, all parts were attached to the right place on one piece of flexible plastic.

Drivers or pilots with contact lenses with a built-in display could request to have the driving speed or the altitude shown. Internet users could use the Internet like on a virtual screen. Computer gamers could place themselves in virtual worlds without the limitation of movement. Wireless technologies would ensure communication, built-in solar cells would provide the power.

But even if American researchers are sure that it will soon be easy to realize lens displays, a full display for the eye is technologically not yet feasible. So far, only initial "compatibility studies" are being conducted for new lenses. In the lab, rabbits were able to wear the contact lenses for 20 minutes without side effects. However, the LEDs were not yet turned on during the tests.