Company Fraunhofer IPMS brings a wearable OLED screen that can sense where the user in looking. The Head-Mounted Display, or HMD, is a monochrome OLED screen that the company has labeled the first bidirectional microdisplay. Inside the active matrix OLED screen are integrated photodetectors that allow the system to detect where the eye is looking. Since this display is being promoted as a Augmented Reality (AR) device, the real world can be seen through the HMD. Fraunhofer states that actions could be sensed through the user's "Gaze," as in holding one's eye on a target to activate it. They also said joggers could watch movies while they are out, which is not a good idea on a busy street. But still, I would not mind retaining the option to do so some day.
Note: The HMD is monochrome. The second picture of a color screen is showing off the size of Fraunhofer's screens.
Eavesdropper
pics via Fraunhofer IPMS