A lot of 4K screens aren't at 60fps, they're at 48fps.
I wouldn't be surprised if this screen is lower than 60fps.
I wouldn't be surprised if this screen is lower than 60fps.
What's wrong with that? Sounds lovely!
24p looks great on plasmas.
I'm pretty sure modern LCDs refresh at a multiple of 24, and can natively refresh at 24 FPS when they detect 24p content
Yes, consumer LCDs often run at 120hz these days and yes, one reason for this is so that they can display 24p content (120 is a multiple of 24) without judder.
If Dell had managed to make the world's first 5120x2880 LCD monitor that runs at 120mhz or higher you can be sure they'd be trumpeting that fact.
A 120hz LCD always refreshes at 120hz, essentially[1]. But it can easily display 60hz content - it just display each frame twice in a row. Same with 30hz (display each frame four times in a row) or even 24hz (display each frame five times in a row) content.
But suppose you were, say, trying to display 119hz content on a 120hz monitor. You'd have to display the first 118 frames for one LCD refresh interval, and then display the 118th frame for two intervals, which causes judder. Or you could blend all of the frames together and simulate a 120hz source (this is "pulldown").
But I see no inherent reason why a 30Hz display cannot also
refresh at 24Hz, especially when the 30Hz limitation seems to
be due to the display connector's bandwidth.
But Dell's 5K monitor almost certainly is a 60hz panel (else they would have trumpeted the fact that it was 120hz!) and 60hz isn't evenly divisible by 24, so you get judder or have to do pulldown.
_______ [1] nVidia's Gsync is one possible solution http://www.anandtech.com/show/7582/nvidia-gsync-review
What I don't understand is why these TVs don't have a DP input so we can use them at 60fps with modern PCs (and already on the market GPUs).
Probably because every TV maker / rebrander and their mother has both an HDMI license and the tooling setup. There's, basically, 0 cost to keep usin gHDMI. Moving to DP needs licensing and retooling.