A display device comprising: a display unit including a display panel configured to display an image; a processor configured to supply a control signal (CS) for controlling a driving of the display unit ; a detection circuit configured to detect whether the control signal (CS) is abnormal based on a frequency of the control signal (CS) measured in a frame unit; and a power supply configured to supply driving power to the display unit , wherein the display device is configured to block the driving power from being supplied to the display unit when the control signal (CS) is detected to be abnormal; means for measuring a temperature of the display panel or an external temperature; $ wherein the detection circuit comprises: a measuring unit configured to measure the frequency of the control signal (CS) in each frame of N successive frames, where N is a natural number of 2 or more; a measuring value storage unit configured to store the measured frequencies of the control signal (CS); a signal generator configured to detect whether the control signal (CS) is abnormal based on an average frequency of the control signal (CS) for the N successive frames, wherein the signal generator is further configured to calculate the average frequency for a detection period formed of the N successive frames from the measured frequencies of each frame and to detect the control signal (CS) to be abnormal for the detection period when the average frequency is outside a threshold range; and the detection circuit further comprises: a threshold range providing unit configured to variably set the threshold range based on the measured temperature. a display unit including a display panel configured to display an image; a processor configured to supply a control signal (CS) for controlling a driving of the display unit ; a detection circuit configured to detect whether the control signal (CS) is abnormal based on a frequency of the control signal (CS) measured in a frame unit; and a power supply configured to supply driving power to the display unit , wherein the display device is configured to block the driving power from being supplied to the display unit when the control signal (CS) is detected to be abnormal; means for measuring a temperature of the display panel or an external temperature; $ wherein the detection circuit comprises: a measuring unit configured to measure the frequency of the control signal (CS) in each frame of N successive frames, where N is a natural number of 2 or more; a measuring value storage unit configured to store the measured frequencies of the control signal (CS); a measuring unit configured to measure the frequency of the control signal (CS) in each frame of N successive frames, where N is a natural number of 2 or more; a measuring value storage unit configured to store the measured frequencies of the control signal (CS); a signal generator configured to detect whether the control signal (CS) is abnormal based on an average frequency of the control signal (CS) for the N successive frames, wherein the signal generator is further configured to calculate the average frequency for a detection period formed of the N successive frames from the measured frequencies of each frame and to detect the control signal (CS) to be abnormal for the detection period when the average frequency is outside a threshold range; and the detection circuit further comprises: a threshold range providing unit configured to variably set the threshold range based on the measured temperature. <EOS>