Blur Busters Forums

roginthemachine wrote: ↑

11 Aug 2025, 19:35

I think I'm probably sold on the display at this point! If they ever released the QN95D in Australia, I probably would have opted for that but alas no.

I take your point re 30fps with 60hz strobing. Personally, I find the double image effect far more distracting than standard sample-and-hold motion blur, so I never really strobe over 30fps. I'd rather bright flashy blurry 30fps with sample-and-hold, then the wierd 'split-universe' feeling of having two separate images every time there is motion, even if those images are very clear.

That just leaves the question of whether LCD ghosting/blur is more tolerable than OLED stutter at 30fps, which is very subjective. I've not used an LCD screen to game in years, so I guess I'll find out.

I generally avoid motion interpolation, especially for retro games where I feel it interferes too much with getting that creative intent. I would also be doubtful that any interpolation, no matter how good, would handle the artificial scanlines of the RT4K well, let alone the masks. I imagine those CRT effects would throw off the algorithm!

I suppose the most acceptable use-case for motion interpolation, if any, for me would be 50fps PAL games. They arbitrarily had to remove 10 frames every minute back in the 1990's ... so restoring those ten frames with an AI algorithm's best guess feels more restorative than additional!

I can live without 100fps gameplay for my PAL games for now via the RT4K 100hz BFI. There is no display that currently does it all! Just waiting until one day there's a sufficiently 32" 4K OLED monitor that can do 480hz that either has the CRT Beam Sim built in, or alternatively there's a version of the CRT Beam Sim on Shaderglass that works properly and with minimal - could be a few years at least!

JimProfit wrote: ↑

11 Aug 2025, 20:23

roginthemachine wrote: ↑

11 Aug 2025, 19:35

But that is something that always confused me. I see many people say that double image artifacts are only visible on impulse displays, but whenever I turn off BFI completely on LCDs and OLED, I still see double image artifacts on 24/30fps content.
I am right now in front of my PG27AQN at 120hz with ULMB disabled on the testUFO page, and I can clearly see double image artifacts on the 60fps and 30fps UFOs, in pure sample and hold: At 60fps two UFOs that separate more clearly at faster movement, 4 legs, and at 30fps everything gets multiplied by two again.
You could argue that is is masking the double image artifacts a little bit, but is is really worth it for all that blur?
Hell, I've even seen double image artifacts on 60hz/60fps content in some TVs, just because the panel is native 120hz and they didn't bother making a true 60hz mode (at least not without interpolation).

It is also worth mentioning that double image artifacts are, like motion blur, a function of how fast objects are moving on the screen.
You rarely hear complains about double image artifacts of 24fps movies on a 120hz TV because when it's just close up shots of people talking, nothing moves fast enough to make duplicates noticeable..

Jim are you sure you are running the ufo at 960px/s rather than 1920px/s? At 60fps on oled i see the middle of ufo at it's most colorfull while the outer edges are faded. Of course i see two ufos during eye tracking at 60fps 1920px/s and 30fps 960px/s. (32 pixels of motion blur each. Something something however many pixels the ufo is)

There is also the difference between eye tracking and fixed gazed vision. Maybe you are capable of seeing much more than average with fixed gazed vision. Hence you see double imaging as the screen is "static" ... Well
https://blurbusters.com/wp-content/uplo ... Motion.png

JimProfit wrote: ↑

11 Aug 2025, 20:23

I am right now in front of my PG27AQN at 120hz with ULMB disabled on the testUFO page,

roginthemachine wrote: ↑

17 Oct 2025, 07:15

Okay SO - I have had the QN90D for a few weeks now and really put it through its paces. Here are my thoughts, for anyone who might at all still be interested in this.

I can confirm the motion clarity using strobing is excellent. Better than anything the CX could achieve, especially as you lower the brightness setting. With respect to motion clarity, I'd take the overall package of the QN90D over the CX any day - the flicker is less intense, the brightness (especially in SDR) is actually high enough to allow for the steep brightness losses required to get a 1-2msec MPRT over 60fps content, and the MPRT can go far lower. There is no detectable lag either with strobing, whereas the CX BFI I believe did add a meaningful, but not game-breaking, dollop of it.

HOWEVER

As the RTings review notes, the QN90D's strobing pattern does produce a slight image duplication. Sadly to my eyes this *is* noticeable in actual gameplay. especially on 2D content. This mars the motion clarity benefits somewhat - for example, scrolling 2D backgrounds ghost onto themselves, creating their own sort of smear that falls short of the LG CX/C1s perfect motion for slower moving objects. For 3D games and slower moving content, or when the colours in question do not contrast quite as much, the double image does become unnoticeable - and its an absolute treat when it does.

The subtle double image is still in my view WAY better than 60fps motion blur (even on OLED) - but it does mean that the QLED takes a hit when compared to the CX/C1 in terms of motion clarity.

I also fear the monitor's response times are too slow for 120fps gaming, with strobing or without. I've only tried out DMC5 on PS5, which has a very unstable and inconsistent 120fps mode, so perhaps I need to a better test study. But it looked blurry with quite apparent ghosting.

Finally, the QN90D appears to suffer from a curious motion bug, which I can only replicate with strobing (LED Clear motion) on. For some reason, in certain cases where the content goes from highly static to fast-paced motion, the QN90D freaks out and drops down to 30fps for about 3 seconds. A great example is the start of a Mario Kart race, going from stationary to racing. It never lasts long, and honestly isn't that distracting (since at least it drops to a *stable* 30fps) but it is does happen from time to time.

The QN90D can process 50hz correctly, but it can't do 50hz strobing - it will simply interpolate up to 60fps and strobe at 60hz - not a huge loss, but a shame nonetheless. The response time of around 8-10msec creates a fairly nice stutter-free 30fps/50fps experience.

OVERALL
Despite the above gripes, I feel this TV offers a better overall sense of motion clarity than the LG CX, while at the same time being way brighter and with strobing that is definitely more gentle on the eyes. The endgame display remains a very bright 4K OLED display with either an aggressive sub-refresh rolling scan to outmatch the CX, or a high hz display with the Chief's CRT Simulator algorithm built in and ready to go. Until then, I'm very pleased with this display! (seriously, Mario Kart 8 with 60hz strobing on this TV looks *stunningly smooth*)