Sycraft (Administrators; 21750)
Posted on: 02-13-2020 13:46.
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No but seriously: The short version is your set is an IPS panel without local dimming, so HDR won't be great. You'll still get some benefit, like more saturated colours but it really can't do much in the way of large brightness variations on screen. So I wouldn't worry about an XOX for it, mostly just for the higher detail/faster FPS.
HDR means "high dynamic range" which is specifically talking about brightness. A normal display goes from whatever the darkest black it can do up to whatever you set the brightness at, about 150-200 nits in most cases for your average TV. However our eyes can handle a lot more, we see a lot more in every day life. We'd like to replicate that.
So HDR displays can get much brighter, and have signaling to allow for that. As much as 2000 nits on some current high end ones. That means you get get scenes where things like lights, reflections, etc truly do shine brightly like they do in the real world. Looks very nice.
However to do that well, you need a lot of contrast ratio on the screen. If you just crank the whole backlight, then dark things get lighter too and it just makes it all bright and washed out. So to pull it off well you have to be able to have lots of contrast between dark and light.
LCDs are not great at that. OLEDs, no problem, they can do it as they are, but LCDs not so much. In particular IPS is really bad. It's nice viewing angles come at the cost of low contrast ratio. VA panels are better at contrast ratio, like 5-7x more than IPS, but come with worse viewing angles. Still doesn't end up being enough to really do it well though.
So the solution is local dimming. You have a bunch of LEDs behind the screen to light it up and what you do is divide them in to groups (or even use them individually) so they can be made brighter or darker separate form other groups. That lets the dark parts of the scene stay dark, and the bright parts get bright which gives a really nice amount of contrast.
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