A method for operating a reflection display system for displaying a display image for a vehicle occupant of a motor vehicle by way of reflection of the display image at a windshield, wherein the reflection display system comprises a display unit which is configured with a micro-LED display comprising a matrix of LEDs in order to output the display image via a display surface of the display unit, and the display unit is arranged on an upper side of an instrument panel such that a reflection of the display image is perceivable via the windshield in an eye region of the vehicle occupant, the method comprising:
- operating at least one subset of the LEDs of the micro-LED display as sensors to measure respective light intensities of incident light;
- detecting a presence of a foreign object on the display surface depending on the light intensities measured by the LEDs which are operated for as sensors;
- and
- signaling a disruption of the display of the display image during the detection of the foreign object on the display surface.