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Avis LG 32GK850G , page 2

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SiZZiGY @
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Posté le: 04 février 2019 à 21:23

Pour les VA, les meilleurs plafonnent à 115 images / secondes, le rendu optimal est obtenu avec l'UMLB activé, normalement maintenant on doit pouvoir l'associer au G-Sync mais même pas sur tous les écrans, dans le cas échéant tu ne pourra activer que l'un ou l'autre, ou alors passer des nuits sur OCN pour bidouiller le firmware de ton écran pour forcer l'activation des deux simultanément.

Attarde toi sur cette partie de TFT central qui devrait t'aider à mieux comprendre :

We carried out some initial response time measurements in each of the overdrive settings, along with some visual tests. We didn't bother testing the 'Off' mode, as there's no reason to use it considering there's no overshoot visible in the higher modes. The response times remained consistent regardless of the refresh rate, from 60Hz all the way up to the overclocked 165Hz.

As you can see above, the response times improved a little each time you increased the 'Response Time' control. None of the modes showed any overshoot at all in these measurements which was excellent news, so you don't need to worry about annoying dark or pale halos caused by a poorly configured overdrive impulse. That normally becomes a major problem when you push response time settings up to the maximum, but LG have been more conservative with the RTC impulse here. There was a small improvement in pixel response times with each increase in the setting, but not by a massive amount. The 'Faster' mode seemed to deliver the optimal performance, with an average G2G of 10.1ms measured. This was skewed a little by some slower black transitions, which is pretty common from VA technology panels. The changes from black to dark and medium grey (0>50 and 0>150) were much slower than the rest of the pixel transitions and dragged the overall average down as a result. If you ignore those very slow transitions from black, the 'Faster' mode actually averaged 6.8ms G2G which is much better.

Pursuit camera photos to represent real perceived motion blur at various settings

In practice you can see the evidence of these slower dark transitions as it results in some black smearing on moving content, where the pixels are slow to change from black shades to grey. We have provided a visual representation of this above from the Blurbusters.com testufo images using a pursuit camera. This is designed to capture motion blur as the human eye would perceive it and so is a decent representation of what you would see in person.

As we have already said, there was no overshoot evident, so no annoying halos introduced because of that. You can see the dark trailing evident behind the moving UFO, particularly on a dark background where the black outline of the UFO is changing to a dark shade. This gets slightly less as you increase the response time control but it's still there even at the maximum 'faster' setting. It's on the lighter backgrounds where you can pick out some improvements in response times. There is a bit more dark smearing at the 'normal' setting in the middle and bottom UFO images, and this is largely eliminated by the time you reach the 'faster' mode. Most of those transitions you see measured in the middle of the tables above have been sped up, and so that's where this improvement comes from.

Unfortunately there is no motion blur reduction backlight provided on this model, which is a bit of a shame considering it is a G-sync screen. Usually G-sync screens will make use of NVIDIA's Ultra Low Motion Blur (ULMB) technology which is incorporated in to the G-sync chip, and offer a strobed backlight feature. This can really help improve perceived motion blur for gaming and make moving images sharper and easier to track. For some reason despite G-sync being used, and there being a high refresh rate, ULMB is not offered on this display.

Par ailleurs sur le test du Z35 c'est écrit un peu plus clairement, un écran plus rapide que ton LG en passant :

The response times were ok overall but some transitions caused problems and were very slow. You end up with obvious dark smearing and blurring in certain circumstances which is a shame, and at the moment a limitation of VA technology it seems. The additional ULMB was very good at improving motion clarity and did help cut back some of that smearing if you want to use that feature. The very high refresh rates enabled by the overclocking feature couldn't really be fully realised though sadly, as we felt that response times were just not fast enough to handle the frame rate demands, and the overshoot introduced by the aggressive overdrive circuit was too obvious. It's still very capable as a VA option with a high refresh rate of 120Hz, with G-sync and ULMB support but the 200Hz overclocking feature couldn't quite keep up sadly.

En gros c'est le même problème sur le LG, le VA n'est juste pas assez rapide pour être capable d'afficher autant d'images par secondes.

En résumé, tu veux du vrai 144Hz? Dirige toi vers une dalle IPS de qualité ou du TN, sinon CG puissante ou pas, la seule chose que tu pourra faire c'est mousser d'avoir un écran 144Hz VA sans jamais en gouter l'expérience car c'est tout bonnement pas disponible à l'heure actuelle dans le commerce. (tout du moins sans contreparties sur la qualité de l'image lors des transitions rapides)

Dernière édition par SiZZiGY le 04 février 2019 à 21:39; édité 6 fois

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Avis LG 32GK850G , page 2

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