Maybe im getting my wires crossed. But HDR is high dynamic range, ie the difference between black and white. Old TV standards white wasnt very white and black wasnt very black.
Now people say you need an HDR screen to see, why do you, you just need a contrast range that fits the HDR standard, or is it more a signal acceptance thing to make us all buy new tvs.
OLED for instance by default can go as black as the screen is made and as bright as they make it, so why does it also need to be HDR certified.