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1ms MPRT = motion blur reduction?

Ask about motion blur reduction in gaming monitors. Includes ULMB (Ultra Low Motion Blur), NVIDIA LightBoost, ASUS ELMB, BenQ/Zowie DyAc, Turbo240, ToastyX Strobelight, etc.

1ms MPRT = motion blur reduction?

Postby Kheri » 29 Sep 2018, 14:00

As I understand it, 1ms MPRT is basically a form of motion blur reduction so I don't need get something like LightBoost ontop of it, correct?

I'm looking to buy a decent-ish gaming monitor. I know some FPS games don't need really benefit from motion blur reduction but I still really want it, and I'll be using my monitor for many tasks and games.

I'm looking at MSI Optix G24C, atm. Should I try to find something better? I'm not sure what the input delay is for this monitor (my reaction time seems to be a fair bit slower than "pro" so maybe that won't matter), and what other specs are important for a gaming monitor. 3000:1 contrast ratio looks like it might be nice, though. I'm also considering getting LG 27GK750F-B or LG 24GM79G-B.
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Re: 1ms MPRT = motion blur reduction?

Postby Chief Blur Buster » 29 Sep 2018, 14:26

Correct

1ms MPRT requires frame visibility times of 1ms, which can only be achieved via:

(A) 1000 frames per second on a 1000 Hertz display

OR

(B) A motion blur reduction mode (e.g. ULMB) that that flashes the frame for only 1ms.

So, yes, for today's monitors, 1ms MPRT = motion blur reduction strobe backlight.

Source: Blur Busters Law And The Amazing Journey To Future 1000Hz Monitors

In current modern writings now -- milliseconds "MPRT" and milliseconds "persistence" are the same thing. So when you see "1ms persistence", that's also the same thing as "1ms MPRT" too.
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Re: 1ms MPRT = motion blur reduction?

Postby Kheri » 29 Sep 2018, 15:08

Thanks, Chief. Do you know what determines input lag? I'm thinking this monitor might be good enough for me - would rather use a link from blurbusters to buy, though. So maybe I'll just wait a bit and see if any deals popup.
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Re: 1ms MPRT = motion blur reduction?

Postby RealNC » 02 Oct 2018, 08:52

Kheri wrote:Thanks, Chief. Do you know what determines input lag?

On the display side, the main factor that determines input lag is image processing. Some non-gaming monitors take the easy route and buffer a whole frame before displaying it. That adds a whole frame of lag. But gaming monitors usually only buffer a little bit of the image before displaying only that bit, which adds very little lag. Image processing before displaying is necessary and can't be avoided (the monitor's hardware needs to alter the image's pixels in order for them to be actually displayed correctly on the LCD pixels.)

When using motion blur reduction, then you have another factor that adds input lag. That is the period of time between the start of the image being displayed, and the time the backlight is switched on. If that period of total blackness is 3ms for example, then that adds 3ms of lag. The lower that time is, the less input lag you get, but the worse the image quality gets, because LCD pixels need a bit of time to actually fully transition from their previous color to their new color. Motion blur reduction basically only shows you a snapshot of the pixels. If you show them too early, then you're going to see only partially transitioned pixel color, and thus image quality is reduced. Since scanning out all the pixels on a display is not instant, but happens from top to bottom rather "slowly" over time, you can't have perfect image quality over the whole image. So a monitor has to play the balance game here, trying to keep input lag low as well as make the image quality acceptable over the whole area of the screen. Some monitors allow you to configure these parameters yourself, some other don't.

Then there's another factor that only has a minor effect on input lag: pixel response time. This has very little impact on lag because the response time for the pixels to transition fully to their their new color is not important. The more important value is the time they need to transition about 10% or so to their new value, which is the point at which you start seeing a change on the screen. That time is very low. However, when used with motion blur reduction, the pixel response time is more important, as it allows the backlight to be switched on sooner. This is why there's TN panels with 0.5ms response times are in the making. They will allow blur reduction to have less lag, or have better image quality (or a bit of both.)
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Re: 1ms MPRT = motion blur reduction?

Postby Chief Blur Buster » 02 Oct 2018, 12:00

Kheri wrote:Thanks, Chief. Do you know what determines input lag? I'm thinking this monitor might be good enough for me - would rather use a link from blurbusters to buy, though. So maybe I'll just wait a bit and see if any deals popup.

RealNC is correct in the latency department. There is a small latency (reduces at higher Hz) from the time period refreshing the LCD in darkness until the backlight is flashed, typically averaging half a refresh cycle of of latency. Faster response + higher Hz panels can reduce the strobe lag penalty.

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