Originally Posted by VBB
I have never tested this at 60Hz (I don't use 30Hz and above at all), but I'm sure you're correct in your findings. I have Clear Action enabled in my Calibrated Dark profile, and there is a subtle, but noticeable difference between on and off (other than the dimming due to BFI, of course). Raven Crimson is a major gamer. That's why CA, especially at 60 and 120 Hz, is very important to him, but it likely also behaves differently on the 2016 P/M Series.
I've said this before, but the 2015 M-series' inherent panel blur, or ghosting/trailing, whatever you want to call it, has always bothered me to the extent that I cannot watch without Reduce Judder at 3. On any of my previous TVs I would disable all motion enhancement features to avoid the soap opera effect (the equivalent of enabling GLL on our M). I find that Clear Action helps reduce this panel blur a little further, in addition to RJ.
Originally Posted by efball
Clear action seems useless on my M60 also (M60, 70, 80 are Sharp panels). It makes the picture very dim, but that's about it. The owners of other sizes report better results.
Ok, now that I understand what Clear Action is supposed to do, I better understand rtings Q&A section, and they observed the same behavior on their M60 used for testing:
(in the "Additional Review Notes" section):
"As with the P, the 'Clear Action' feature doesn't work. It only slightly reduces the backlight, without making any visible change to the motion blur. The feature works well on the E."
Then there is a Q&A about the M55:
Q: "Not a question but rather a comment. I own the 55 inch version of this TV and find that the "Clear Action" feature actually does improve motion blur quite dramatically. It does not merely dim the backlight but rather activates a strobing effect. It's distracting in bright rooms but quite tolerable in a light-controlled environment. It has a big impact on video games and deserves to be highlighted."
A: "It's possible that Clear Action works on different sizes. If you don't mind sending us an email with your TV's firmware version, we'd like to investigate this further."
Given I have been confused with this topic for a while, let me try to summarize again my understanding in case it could be helpful to someone else (apologies in advance if this is obvious to everyone here):
* A 60Hz video source without any processing (i.e. GLL On) looks like the picture below (notice the "Ghosting/Trail" issue, there are basically 2 images displayed on top of each other, with a small offset):
* The same video source with GLL Off and Reduce Motion Blur at 10 looks like the picture below (notice the absence of "Ghosting/Trail", as there is only a single image visible):
* In theory, with both GLL On and Clear Action On, the Vizio M should produce the 2nd image, but instead it produces the 1st image (or something very close). The theory is that Clear Action inserts a "black" image between each image displayed, hence making the "trail" disappear when a new image is produced.
The reason this is important for gaming is that "Reduce Motion Blur", which solves the ghosting problem, comes with a much higher input lag, making games feel unresponsive. So, to get a reasonable input lag, "GLL" needs to be enabled, disabling "Reduce Motion Blur" as a side effect. At that point, we have low input lag, but ghosting/trailing. If Clear Action was working properly, it would have eliminated the ghosting/trailing while keeping a low input lag.
As an example of games where this is annoying, imagine a First Person Shooter where the view rotates constantly. If there is a vertical tower with a sky background for example, the tower image is doubled ("Ghosting") as the view rotates. "Clear Action" should have eliminated that effect and it would have looked much nicer. As an experiment, this can be more or less simulated by disabling GLL and setting Reduce Motion Blur to 10 while playing such games (at that point input lag is terrible though).