Olympus has prototyped a head mount display that shows information when required without impairing vision. The HMD does not usually display anything but shows simple information on certain occasions, e.g. to notify the arrival time of your train, or to draw attention when you receive an e-mail.

“A main body of the HMD shapes like a stick and measures 3.2 mm x 3.2 mm x 27 mm. A 0.16-inch LCD panel with 113,000 pixels is embedded in the main body that is to be attached to the eyeglasses. The total weight of the main body and the attachment portion as light as 27 g enables prolonged use.”

Via Wonderland Tech-On.