Movies too smooth on 4K LCD (not SOE)

[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.