Method and Device for Operating a Windshield Display System With a Covered Display Detection, and Windshield Display System

A reflection display system for displaying a display image for a vehicle occupant of a motor vehicle by reflection of a display image on a windshield, the reflection display system comprising:

• a display unit, which is designed to display the display image on a display surface;
• a detection sensor system for acquiring the displayed display image on the display surface;
• and
• a control unit, which is designed to
• activate the display unit for display;
• ascertain detection information depending on the displayed display image,
• establish a presence of a foreign object on the display surface of the display unit depending on the displayed display image and depending on the detection information;
• and
• signal a disturbance of the display when the presence of a foreign object on the display surface of the display unit is established.

A method for detecting a foreign object on a display unit of a reflection display system, which causes a reflection of a display image on a windshield in an eye region of a vehicle occupant, the method comprising:

• displaying the display image on the display surface;
• acquiring the displayed display image on the display surface by way of a detection sensor system;
• ascertaining acquisition information depending on the acquired displayed display image,
• establishing a presence of the foreign object on the display surface of the display unit depending on the displayed display image and depending on the acquisition information;
• and
• signaling a disturbance of the display if the presence of the foreign object on the display surface of the display unit is established.