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LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

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LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction, Freesync

Postby k2viper » 23 Jan 2018, 07:36

Hello guys,
Anyone using this new display yet?

http://www.lg.com/us/monitors/lg-27GK75 ... ng-monitor

Just ordered it, hope I'll get my hands on it on weekend or monday.
Picture on LG's off.site displays OSD: blur reduction simultaneously on with freesync. An error, probably?
I dont have an AMD graphics card to test freesync, anyway.
Last edited by k2viper on 06 Feb 2018, 09:33, edited 1 time in total.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction

Postby RealNC » 23 Jan 2018, 09:09

k2viper wrote:Picture on LG's off.site displays OSD: blur reduction simultaneously on with freesync. An error, probably?

That's just a photoshop for marketing purposes. Misleading, but the person doing it had probably no idea what this stuff even means :P
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction

Postby k2viper » 23 Jan 2018, 09:14

User's manual clearly states that Freesync and 1ms blur reduction cannot be used at the same time. Predictable :)

I found a review of this display, looks like it has low input lag, fast response times and very low overshoot, so with strobing it should be fine at 240Hz.

https://be.hardware.info/reviews/7841/2 ... g-27gk750f (use google translate to read)

Currently I own Asus VG278H and I use it with constant lightboost 10% enabled, so I'm pretty used to blur reduction (strobing).
Just wanted to get a 240hz display not smaller then my current 27, but I didnt want to sacrifice blur reduction, thats why I skipped first 27" 240hz displays, such as Acer XB272.

Cant wait to test this LG, actually.
Ordered it in Russia for ~480USD, even cheaper then recommended price on LG's site. Very good price imo.

ps. Btw, is there a way to use VRR (Freesync) having Nvidia graphics card (i have 1070)?
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction

Postby RealNC » 23 Jan 2018, 09:39

k2viper wrote:ps. Btw, is there a way to use VRR (Freesync) having Nvidia graphics card (i have 1070)?

Nope. NVidia refuses to support freesync. And there's no workarounds or hacks for this.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction

Postby open » 25 Jan 2018, 02:05

You will still see an increase in smoothness. Higher refresh rates even without g-sync or vsync or freesinc will still have more smoothness. The length of each refresh is the maximum ammount of time that the refresh cycle can add delay to any part of a frame.

Bonus question: Is this the only monitor besides the benqs that can do strobing at 240hz?
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction

Postby k2viper » 25 Jan 2018, 06:40

open wrote:You will still see an increase in smoothness. Higher refresh rates even without g-sync or vsync or freesinc will still have more smoothness. The length of each refresh is the maximum ammount of time that the refresh cycle can add delay to any part of a frame.


I'm sure that I will definitely feel difference between my old "1st-gen" VG278H and modern, more responsive panel with twice more hertz.

open wrote:Bonus question: Is this the only monitor besides the benqs that can do strobing at 240hz?


Yes, and its the only 27" one that do so. Thats why I've been waiting for this model, and ordered it right as they become available.

Btw, I'm still looking for a method to get service menu on LG displays with joystick (no dedicated "power" and "menu" buttons available).
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction

Postby k2viper » 30 Jan 2018, 08:54

Finally got my monitor, gonna try it tonight.

https://youtu.be/gKtZLw0AksM?t=385

It definitely strobes at 240hz.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction

Postby k2viper » 30 Jan 2018, 12:52

Got display up and running!

Very well built, strong aluminium stand w/tilt, accessory package (includes PSU, 3 cables - DP, HDMI and USB3).

First impressions - 240Hz is great, clear, much fluidy and smooth then 120hz. Input lag is lower comparing to VG278H, I directly feel how responsive this display is.

Strobe crosstalk is more visible then on my VG278H 120hz lightboost 10%, but maybe panel needs more warming up, after 30min usage it crosstalks less then right after "cold boot".
On 144hz and 120hz crosstalk is present too. I will experiment with VT tweaks soon.

What i feel almost perfect, is the overdrive, it's fast and almost NO visible overshoot, even scrolling text in browser seems very readable. I'm pretty impressed.

I took some pictures, but I think you dont want to look at standard package and display body pics, but crosstalk shots I took look very smeared, I need to try different camera or camera settings.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction

Postby Chief Blur Buster » 30 Jan 2018, 13:07

k2viper wrote:Strobe crosstalk is more visible then on my VG278H 120hz lightboost 10%, but maybe panel needs more warming up, after 30min usage it crosstalks less then right after "cold boot".
On 144hz and 120hz crosstalk is present too. I will experiment with VT tweaks soon.

Please do.

Follow Appendix A of www.blurbusters.com/crosstalk for creating working custom vertical totals from an existing mode. (Basically in ToastyX CRU, copying the 240Hz mode, locking the Pixel Clock, then increasing the Vertical Total in order to force the refresh rate to go down while maintaining Pixel Clock). 240Hz gives you about 4ms of VBI time at 120Hz+Large VBI. If strobe crosstalk is more intense at top or bottom, try transferring pixels between Vertical Front Porch and Vertical Back Porch. This may force the monitor to bring the strobe pulse earlier/later, shifting the crosstalk zone upwards/downwards. Different monitors have different strobing behaviours.

k2viper wrote:I took some pictures, but I think you dont want to look at standard package and display body pics, but crosstalk shots I took look very smeared, I need to try different camera or camera settings.

Usually, you need to use a pursuit camera technique to successfully capture WYSIWYG motion blur photography. Formerly the domain of scientific laboratories, I'm the creator of the simplified/inexpensive blogger-friendly pursuit camera technique now used by others (e.g. RTINGS, TFTCentral, pcmonitors, etc).

However, for strobe backlights since it's a near-instantaneous-flash, it's possible to analyze strobe crosstalk via a stationary photograph. Point your smartphone at screen, adjust exposure exactly, then snap. Simply make your camera exposure no more than one refresh cycle (e.g. 1/240sec or faster for 240Hz), use a 3rd party camera app to give your smartphone manual exposure adjustment.

That said, top, center, and bottom can have different amounts of strobe crosstalk -- this is because the pixels are refreshed at different times during a refresh cycle (top to bottom scanout) -- before the global backlight flash of a blur-reducing strobe backlight. As a result, crosstalk can be different due to differing levels of incomplete LCD GtG pixel transitions at the time of the visible flash. We have found ways to adjust/reduce this via strobe phase, length, and Large Vertical Totals, explained in Advanced Crosstalk FAQ -- but it only works as long as the monitor co-operates.
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Re: LG 27GK750F-B - 240Hz, 27" 1ms Blur reduction

Postby k2viper » 30 Jan 2018, 13:14

Quick custom res test through nvidia CP - supports pixelclock up to ~640Mhz!
Afair Benqs worked only up to 600mhz.
Crosstalk reduced.

But maybe you guys advise me to adopt custom res to reduce crosstalk even more?

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