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Comment by noteloop | Hacker News Reader

One of the cool things about the 84" version is that it does 4K at 120 Hz. This allows for much lower touch and stylus latency. It is likely using custom internal hardware like the 5K iMac to do achieve that refresh rate so you are probably stuck with the built in GPU.

It is odd that the 55" is only 1080p when you have 55" 4K Vizio TV's going for $999.

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The 55" 4K has a lot of lag, and so not good for gaming or other high refresh needs... Looks pretty though.

Source: I have one sitting on my desk.

Can you code on it?

Of course! They MUST be up to code, or the whole thing will crash!

> One of the cool things about the 84" version is that it does 4K at 120 Hz. This allows for much lower touch and stylus latency.

Not necessarily. Input lag on IPS (especially the large 4K ones) is generally a much higher contributor to overall delay than refresh rate.

See this (filter the resolution to 4K): http://www.displaylag.com/display-database/

Why does 120hz vs 60hz matter fo latency? Or 4k vs 1080p?

Because for the old stuff.. we are talking a 1-2 second lag. 60hz vs 120hz is like 16ms vs 8ms per frame, which is not noticeable.

You'd be surprised how sensitive we are to latency on input. Microsoft themselves did studies on it: https://www.youtube.com/watch?v=vOvQCPLkPt4

You can visibly see and feel the delay on the Wacom Centiqs and they're 60 Hz.

You adjust but it's not as ideal as there's mild tendency to under/over draw. This is probably less of a problem for a whiteboard but for art, its more problematic.

That's probably due to input lag rather than refresh rates though. For non-TN screens, input lag (generally >30 ms) tends to dwarf refresh rate differences (16 ms vs 8 ms).

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