BENQ XL2411Z, Better motion blur at 60hz. [TestUFO issue]

[Scizaki]

Excuse my ignorance, very new to high HZ monitors.

When @60hz on a BENQ XL2411Z, and the Blur Busters Strobe Utility,
I achieve practically zero motion blur using the Moving Photo Test.

http://www.testufo.com/#photo=alien-inv ... test=photo

However, as I increase my HZ upwards to 144hz the motion blur increasingly gets worse.
Tried in Firefox/Chrome/Opera.

Is this normal?

Also, is the refresh rate on the Moving Photo Test supposed to say 60 HZ ( in my case, and 67 in only IE) or the HZ you are currently using?

[Falkentyne]

internet explorer has a bug where the highest refresh rate that will work vssync'd is 100 hz.
Trying to use 120hz in HTML5 will report 60hz/60 fps and trying to use 144 hz will report 72 hz/72 fps.

Also, it should never say 67 hz. If it does, it means you changed refresh rates without restarting the browser. Try closing all instances or ending task on iexplore.exe and restarting it.

Also make sure single strobe is enabled in the service menu and set strobe phase to 000 (or far left sider in the crosstalk slider in the windows utility).

[Scizaki]

Thank you very much for the reply Falken. I did what you said, but could you answer my question about is it normal that increasing the hz also increases the motion blur?

[Razorless]

Thank you very much for the reply Falken. I did what you said, but could you answer my question about is it normal that increasing the hz also increases the motion blur?

The motion blur is not affected by Hz only by persistence. 144 Hz will have identical motionblur as 60 Hz when persistence is the same.

Maybe you are seeing ghosting or crosstalk. That is affected by Hz since different Hz settings use different timings and VT.

See here for a list of possible custom resolutions. This can greatly improve the quality of motion:
http://forums.blurbusters.com/viewtopic.php?f=13&t=560

[Falkentyne]

Yep this is true.

Keep in mind that if you are *NOT* using a vertical total tweak, different refresh rates will have different persistence values at the same strobe duty (the windows utility is based on a VT 1350 tweak, although it also applies to VT 1500, too).

You can't use a VT tweak at 144 hz, so the persistence values for 144 hz are like this:

0.07 ms (strobe duty 001) to 2.1 (strobe duty 030).
30 steps: each point of strobe duty increases the persistence by 0.07ms per point. (0.07ms x 30 =2.1 ms).
At 100 hz (without a Vt tweak), the lowest value is 0.1 and maximum is 3.0ms
So it goes up by 0.1 every point of strobe duty, so strobe duty 010=1ms persistence. Pretty easy to calculate that.

When either a VT 1350 or VT 1500 tweak is used, the backlight uses the 60hz pulse widths, which are 0.167 ms per point, and .167ms x 30= tada....5 ms So this is the value used for 1) 60hz, 2) 100hz with a VT tweak, 3) 120hz with a VT tweak.
it's worth noting that 100hz is rated for 3ms MAXIMUM and 120hz is rated for 2.5ms maximum, so you do not want to exceed 2.5ms or 3ms WITH a VT tweak (since without a VT tweak, those would be the upper limits.

http://display-corner.epfl.ch/index.php/BenQ_XL2411Z

Why use a VT tweak, then? Because with a VT tweak, you accelerate the scanout, which lowers the position of the bottom strobe settling error and pushes it completely off the screen at VT 1500 (so then you only have to worry about minor settling errors at the bottom, and a smart part of very top "intense" settling errors at the very very top, if you are using strobe phase 000 and a strobe duty higher than 003.

Apparently, the XL2430T changes how the TOP error position works when using a VT tweak; it not only still accelerates the scanout (increases distance between top and bottom settling errors, but also pushes the top position downward also; I'll need to test one of these before masterotaku gets his hands on one....

[Scizaki]

Just wanted to say thank you so much for the in-depth replies guys. Skimmed it, will try to digest most of it later.

Cheers.

[Scizaki]

Very much my fault, after continuing to see if there was something I was not doing properly on the moving photo test website. I finally realized at the bottom in big bold letters next to a capitalized IMPORTANT, it says to have Aero turned on. Now my moving photos look nearly perfect.

Also anyone reading looking for help/understand in addition to the above posters.

http://forums.blurbusters.com/viewtopic ... rt=10#wrap
The posts by Chief Blur Buster were very helpful.

[matthewdg1973]

Seems like no matter what I do or settings I use the moving photo always has a double image and seems like stuttering at intervals.

[gamerscore]

^ download and use latest Chrome Beta