Abstract: A display device includes a high definition multimedia interface (HDMI) input port to which an HDMI is connected, an HDMI receiver receiving an HDMI signal from a source device through the HDMI connected to the HDMI input port, a voltage sensor for sensing a voltage supplied from the source device, a hot plug detect (HPD) controller for transmitting an HPD signal to the source device when the voltage detected by the voltage sensor is higher than or equal to a predetermined voltage, and an auxiliary power supply for supplying a voltage higher than or equal to the predetermined voltage to the voltage sensor when the voltage is supplied from the source device.

Abstract: A display device includes a display panel, a backlight unit configured to provide light to the display panel, an external input interface configured to receive an image signal and image information about the image signal from an external device, and a processor configured to, when a frequency of the image signal is reduced from a first frequency to a second frequency according to a variable refresh rate (VRR) operation, transmit a local dimming signal based on a third frequency between the first frequency and the second frequency to the backlight unit.