HDR video removes some of the limitations of a standard video signal and shows the image built from a wider gamut of colour and brightness.
Notes:
HDR function will activate automatically if an HDR signal is detected, provided that HDMI 2.0 Format has been set to “Enhanced” in the ‘HDMI Settings’ menu.
If you are connecting via one of the HDMI ports, the external device must also support HDR, HDMI2.0 and be playing HDR mastered content.