| abstract |
A sensor device configured to be attached to a drug delivery device and configured to illuminate the drug delivery device when attached, the sensor device comprising: an OLED (29) having a transparent first electrode, a transparent A second electrode and a central layer disposed between the first electrode and the second electrode, the central layer comprising at least one organic layer configured to emit light through the transparent first electrode; and an optical sensor ( 25) which is arranged to receive light reflected from a surface of a drug delivery device, wherein the central layer of the OLED has an area not having said at least one organic layer, and wherein the optical sensor is arranged so that when the sensor device is attached to the drug While the device is being delivered, the optical sensor observes a predetermined area of the surface of the drug delivery device through a region that does not have the at least one organic layer. |