A method for controlling a display device in a motor vehicle includes detecting a person's body posture using sensors that generate corresponding sensor values, and determining, based on the detected sensor values, whether the person is in a normotonic posture. The method also includes determining a distance between the person's eyes and the display device if the person is determined to be in a normotonic posture, and adjusting predetermined display parameters on the display device based on the distance of the person's eyes from the display device.