A display device comprising: a display unit including a display panel configured to display an image; a processor configured to supply a control signal for controlling a driving of the display unit; a detection circuit configured to detect whether the control signal is abnormal based on a frequency of the control signal 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 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 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; a signal generator configured to detect whether the control signal is abnormal based on an average frequency of the control signal 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 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 for controlling a driving of the display unit; a detection circuit configured to detect whether the control signal is abnormal based on a frequency of the control signal 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 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 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; a measuring unit configured to measure the frequency of the control signal 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; a signal generator configured to detect whether the control signal is abnormal based on an average frequency of the control signal 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 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.