or both beam paths 15 a displaceable splitter prism 14 which optionally as desired by the surgeon couples the image of oled 7 e via an overlay beam path depicted with its axis 16 into microscope beam path 15 can be provided for this purpose depictions of imaging optics have been omitted according to a further variant embodiment of the present invention oled 7 e can be configured in double sided fashion in other words an oled is used that has one display surface toward the inner side of the microscope the image on this display surface is used for overlay into one or both beam paths of the microscope in addition thereto the same oled also has a second display surface that faces outward the display surfaces can present the same or different information the following existing art is relevant to flexible oled displays oled films and their applications the press release of the german federal ministry for education and research bmbf deutschland entitled u201c another step toward film based display screens u201d der bildschirm auf folie r u00fcckt n u00e4her dated aug 31 2003 aktuell 154 03 reports on a research group at the institute for applied light physics institute fiir angewandte photophysik of the technical university of dresden this research group has developed low molecular weight organic light emitting diodes oleds that supply the brightness necessary for display screen applications at a voltage of only 2 5 volts because the organic layers are very thin these new oleds are suitable for constructing display screens even.