OSA-Direct
Friday, 26 May 2017

Fraunhofer FEB to showcase OLED microdisplays as high-precision optical fingerprint sensors

The fingerprint sensor uses this bidirectional functionality of light-emission and detection as well - the finger gets illuminated and the reflected light will be detected and analysed

5 May 2017 | Editor

The Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP is set to present a high-resolution fingerprint-sensor based on OLED microdisplays at the forthcoming SID Display Week 2017, from May 23-25 2017 in Los Angeles/USA.

The Fraunhofer FEP has been developing various application-specific OLED microdisplays based on OLED-on-silicon technology successfully for many years. This unique technology enables the high-precision integration of an OLED as light source on a microchip. Moreover this microchip can be designed with further sensor elements, e.g. photodiodes.

By this, objects can be illuminated and at the same time the reflected light detected and analysed. Such microdisplays can be integrated into interactive data eyeglasses as a "bi-directional microdisplay" - the tiny display projects the information for augmented-reality applications whereas the camera function detects the viewing direction – thus the content can be controlled by eye-movements.

The fingerprint sensor uses this bidirectional functionality of light-emission and detection as well - the finger gets illuminated and the reflected light will be detected and analysed.

Fraunhofer FEP - Fingerprint sensor - using OLED microdisplay

Figure: Fraunhofer FEP - Fingerprint sensor - using OLED microdisplay

The first prototype has a native resolution of 1600 dpi – this is three times more than typically required by the FBI. This high spatial resolution enables the identification even of smallest sweat pores beside the typical papillary lines, which can be used to increase the security.

One of the most promising applications of this new kind of sensor is the user verification in mobile devices. Because of the particularly high resolution in comparison to the typically used capacitive fingerprint sensors these devices are much less vulnerable to so-called spoofing (the manipulation by "false fingers").

Another interesting side application is the opportunity for using the active area as a normal display and then displaying branding, displaying logos or notifications.

blockquote>Bernd Richter, deputy division manager for OLED microdisplays and sensors at Fraunhofer FEP said, "We have used an extra-thin encapsulation for the chip of this fingerprint sensor. Thereby the distance between finger and image sensor has been minimized and the fingerprint can be captured excellently. Thus, an additional imaging optics is not necessary for this application."

www.fep.fraunhofer.de   


About Fraunhofer FEP

Source: Fraunhofer FEP


login
cintelliq logo