Movies too smooth on 4K LCD (not SOE)

[dcx4610]

Originally Posted by Flack999

Thank you!
After reading a lot about it, I think the 60hz display might cause some of my problems.
My old LCD had 100hz, which would probably also not be ideal, but the software at least handled the motion in a more natural way.
It just never looked as smooth and digital ever before I got this 4K TV and I was (am) worried that films will look like that from now on in my homecinema.
I think the Sony has 120hz and should be a better solution overall.
Still have 4 weeks to return the TCL.

Yep. Even 100hz would be better. It just multiplies 25x4. You have to have a keen eye to notice an issue there. It's not perfect like 120hz/240 and still requires interpolation but it's minimal.

Where as 60hz, 25x2 gets us to 50hz and it has to interpolate 10 extra frames. Hopefully I'm explaining that correctly but that's how I understand it.

Basically, 120hz is the way to go if you want interpolation-free viewing of 24fps content.

[Flack999]

Originally Posted by dcx4610

Yep. Even 100hz would be better. It just multiplies 25x4. You have to have a keen eye to notice an issue there. It's not perfect like 120hz/240 and still requires interpolation but it's minimal.

Where as 60hz, 25x2 gets us to 50hz and it has to interpolate 10 extra frames. Hopefully I'm explaining that correctly but that's how I understand it.

Basically, 120hz is the way to go if you want interpolation-free viewing of 24fps content.

Yeah. Thank you.
Quite a lifesaver this information. I already knew I probably had to get rid of the TCL as it was giving me no joy (except for Ps5 gaming in 4k), but at least now the issue is clear and I know what I have to look for from now on.

Thanks guys!

[PrestigeWorldwide]

Originally Posted by dcx4610

Yep. Even 100hz would be better. It just multiplies 25x4. You have to have a keen eye to notice an issue there. It's not perfect like 120hz/240 and still requires interpolation but it's minimal.

Where as 60hz, 25x2 gets us to 50hz and it has to interpolate 10 extra frames. Hopefully I'm explaining that correctly but that's how I understand it.

Basically, 120hz is the way to go if you want interpolation-free viewing of 24fps content.

Curious. What about 4K TV's like the LG C8 that are 4K60 and support 1080p120? Does that mean standard blu-rays wouldn't have interpolation, but UHD bd's would?

[dcx4610]

Originally Posted by PrestigeWorldwide

Curious. What about 4K TV's like the LG C8 that are 4K60 and support 1080p120? Does that mean standard blu-rays wouldn't have interpolation, but UHD bd's would?

I believe the C8 is a native 120hz panel. The 4K/60 spec is for displaying 60 frames per second. The TV will take that 4K/60 and simply copy those frames 1:1 to 120fps/hz.

But for movies, you are dealing with 4K/24fps/hz so it copies 5 times.

Theoretically, let's say they released the Hobbit in 48fps on UHD and you have a 120hz panel. 48x2 = 96 or 48x3 = 144. None of those numbers multiply to 120 so we need interpolation for the extra frames.

It's all about matching the native hz of the display panel. The panel is 120hz no matter what signal you are throwing at it in the end. It just copies those frames to get to 120hz.

This is how I understand the subject and if I'm wrong, someone please chime in.

[PrestigeWorldwide]

Originally Posted by dcx4610

I believe the C8 is a native 120hz panel. The 4K/60 spec is for displaying 60 frames per second. The TV will take that 4K/60 and simply copy those frames 1:1 to 120fps/hz.

But for movies, you are dealing with 4K/24fps/hz so it copies 5 times.

Theoretically, let's say they released the Hobbit in 48fps on UHD and you have a 120hz panel. 48x2 = 96 or 48x3 = 144. None of those numbers multiply to 120 so we need interpolation for the extra frames.

It's all about matching the native hz of the display panel. The panel is 120hz no matter what signal you are throwing at it in the end. It just copies those frames to get to 120hz.

This is how I understand the subject and if I'm wrong, someone please chime in.

I read more about it. You are correct that the LG C8 is a 120hz panel. Unfortunately, it's only HDMI 2.0. So I can get 4K 120 from internal apps and USB, but from anything connected via HDMI, I'm stuck at 4K 60 or 1080p 120. If it works by copying the frames to get to 120hz, I should be fine though.

[dcx4610]

Originally Posted by PrestigeWorldwide

I read more about it. You are correct that the LG C8 is a 120hz panel. Unfortunately, it's only HDMI 2.0. So I can get 4K 120 from internal apps and USB, but from anything connected via HDMI, I'm stuck at 4K 60 or 1080p 120. If it works by copying the frames to get to 120hz, I should be fine though.

Yes. 4K/120 is more of a PC/gaming spec. This is to allow for games to hit high frame rates at 120fps. That's extremely tough to do right now and requires a lot of bandwidth.

1080/120hz is also more for PCs/gaming where 120fps at 1080p is way more achievable and requires less bandwidth.

As long as your panel itself is 120, that's all that matters. The input signal just needs to divide/multiply or match the native panel's hz. If it doesn't, that's when there is a problem. The panel is always 120hz no matter what signal is being sent.