A vehicle comprising a safety-critical system, said safety-critical system comprising a controller system (102 - 104), a display panel, and a camera, the controller system (102 - 104) being configured to detect correct or incorrect operation of the display panel during display in real-time of a video signal from the camera wherein: the display panel comprises a physically covered part, and the controller system (102 - 104) comprises: a dynamic pattern adding module configured to add a dynamic pattern into video frames of said video signal, the dynamic pattern being such as to induce a clearly detectable and expected evolution of the power consumption of the display panel displaying the video signal with the added dynamic pattern, wherein said dynamic pattern adding module is configured to add said dynamic pattern at a position corresponding to the physically covered part of the display panel so that the dynamic pattern is imperceptible to human vision when the video signal with the added dynamic pattern is displayed by the display panel; a measurement module configured to measure the power consumed by the display panel during the display of the video signal with the added dynamic pattern to determine a measured power consumption evolution; and a detector module configured to determine whether the measured power consumption evolution corresponds to the expected power consumption evolution by determining whether a deviation between expected and measured power consumption evolutions is within a predetermined deviation threshold or range; wherein, a deviation which is within the predetermined deviation threshold or range indicates a correct operation of the display panel and a deviation which is not within the predetermined deviation threshold or range indicates an incorrect operation of the display panel. the display panel comprises a physically covered part, and the controller system (102 - 104) comprises: a dynamic pattern adding module configured to add a dynamic pattern into video frames of said video signal, the dynamic pattern being such as to induce a clearly detectable and expected evolution of the power consumption of the display panel displaying the video signal with the added dynamic pattern, wherein said dynamic pattern adding module is configured to add said dynamic pattern at a position corresponding to the physically covered part of the display panel so that the dynamic pattern is imperceptible to human vision when the video signal with the added dynamic pattern is displayed by the display panel; a measurement module configured to measure the power consumed by the display panel during the display of the video signal with the added dynamic pattern to determine a measured power consumption evolution; and a detector module configured to determine whether the measured power consumption evolution corresponds to the expected power consumption evolution by determining whether a deviation between expected and measured power consumption evolutions is within a predetermined deviation threshold or range; wherein, a deviation which is within the predetermined deviation threshold or range indicates a correct operation of the display panel and a deviation which is not within the predetermined deviation threshold or range indicates an incorrect operation of the display panel. a dynamic pattern adding module configured to add a dynamic pattern into video frames of said video signal, the dynamic pattern being such as to induce a clearly detectable and expected evolution of the power consumption of the display panel displaying the video signal with the added dynamic pattern, wherein said dynamic pattern adding module is configured to add said dynamic pattern at a position corresponding to the physically covered part of the display panel so that the dynamic pattern is imperceptible to human vision when the video signal with the added dynamic pattern is displayed by the display panel; a measurement module configured to measure the power consumed by the display panel during the display of the video signal with the added dynamic pattern to determine a measured power consumption evolution; and a detector module configured to determine whether the measured power consumption evolution corresponds to the expected power consumption evolution by determining whether a deviation between expected and measured power consumption evolutions is within a predetermined deviation threshold or range; wherein, a deviation which is within the predetermined deviation threshold or range indicates a correct operation of the display panel and a deviation which is not within the predetermined deviation threshold or range indicates an incorrect operation of the display panel.