For car designers, secret agents in the movies and jet fighter pilots, data eyeglasses – also called head-mounted displays, or HMDs for short – are everyday objects. They transport the wearer into virtual worlds or provide the user with data from the real environment. At present these devices can only display information. “We want to make the eyeglasses bidirectional and interactive so that new areas of application can be opened up,” says Dr. Michael Scholles, business unit manager at the Fraunhofer Institute for Photonic Microsystems IPMS in Dresden.

The chip measuring 19.3 by 17 millimeters is fitted on the prototype eyeglasses behind the hinge on the temple. From the temple the image on the microdisplay is projected onto the retina of the user so that it appears to be viewed from a distance of about one meter. The image has to outshine the ambient light to ensure that it can be seen clearly against changing and highly contrasting backgrounds. For this reason the research scientists use OLEDs

In industry and in the medical field, the interactive data eyeglasses could enable numerous tasks to be performed more simply, efficiently and precisely. Many scenarios are possible, including patients’ vital functions, MRT and x-ray images for the operating surgeon, construction drawings for erection engineers and installation instructions for service technicians.
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