This article focuses on LG vs Samsung for dominance in this area. Interesting to note that they refer to "high production costs" when elsewhere I read that OLED has the potential to have the cheapest production costs- essentially to be built using ink jets. See AMOLED here.
And from this link, we see they can also be image sensors and photovoltaic devices:
"...Organic devices are particularly intriguing for image sensors because just by changing the voltage polarity on an oLED you can change it from a light source to a light sensor. For example, you could integrate a fingerprint sensor into a display: Touch the display, and verify not only the fingerprint, but also that the finger is living finger by its hemoglobin count, thereby foiling the authors of numerous movies and books whose bad guys trick identification units with severed body parts...."
And from this link, we see they can also be image sensors and photovoltaic devices:
"...Organic devices are particularly intriguing for image sensors because just by changing the voltage polarity on an oLED you can change it from a light source to a light sensor. For example, you could integrate a fingerprint sensor into a display: Touch the display, and verify not only the fingerprint, but also that the finger is living finger by its hemoglobin count, thereby foiling the authors of numerous movies and books whose bad guys trick identification units with severed body parts...."