Method and device for testing the function of a display device of a medical-technical device

The invention relates to a method for testing the function of a display device of a medical-technical device, wherein at least a portion of the display device is driven with a reference signal, being output from the display device, if properly function when driven with the reference signal a response signal, wherein the means of a sensor device the response signal occur is monitored, wherein a non-correct function of the display device is identified if no signal or a different signal from the response signal is sensed by the sensor device.