XL2411P: VT 1500

[rockymanso]

Hello guys,

I think I did right in here. I've done the VT 1500 in my xl2411p. It's was very easy. I can now move the crosstalk area much better compared to the automatic using strobe utility. But when I get pass crosstalk Area 49, which is 50, I got black display. Im just using the nvidea control panel.

[Falkentyne]

Hello guys,

I think I did right in here. I've done the VT 1500 in my xl2411p. It's was very easy. I can now move the crosstalk area much better compared to the automatic using strobe utility. But when I get pass crosstalk Area 49, which is 50, I got black display. Im just using the nvidea control panel.

Check the sticky thread about the blur reduction.

Area is based on 100 units. 120hz uses 8.3ms pulse widths. Frame time is 8.3ms (since that's 120hz).

When you use any VT tweak at 120hz, the monitor "reverts" for some reason to 60hz pulse widths (16.7ms) for the strobing. Since 120hz is 8.3ms, that cuts down the "AREA" in half (8.3 is half of 16.7, right?). So since Strobe phase starts at 0, that's 50 units (0-49). So going to 50 turns off the backlight.

This also causes the strobe duty value (the time the backlight is actually flashed "on" during an entire refresh cycle which is equal to persistence) to change from I think, 0.0083 to 0.0167 per "point" added of Strobe duty.

I'm recalling this from memory so I could be very very wrong. Check the thread sticky for the correct math.

[rockymanso]

Hello guys,

I think I did right in here. I've done the VT 1500 in my xl2411p. It's was very easy. I can now move the crosstalk area much better compared to the automatic using strobe utility. But when I get pass crosstalk Area 49, which is 50, I got black display. Im just using the nvidea control panel.

Check the sticky thread about the blur reduction.

Area is based on 100 units. 120hz uses 8.3ms pulse widths. Frame time is 8.3ms (since that's 120hz).

When you use any VT tweak at 120hz, the monitor "reverts" for some reason to 60hz pulse widths (16.7ms) for the strobing. Since 120hz is 8.3ms, that cuts down the "AREA" in half (8.3 is half of 16.7, right?). So since Strobe phase starts at 0, that's 50 units (0-49). So going to 50 turns off the backlight.

This also causes the strobe duty value (the time the backlight is actually flashed "on" during an entire refresh cycle which is equal to persistence) to change from I think, 0.0083 to 0.0167 per "point" added of Strobe duty.

I'm recalling this from memory so I could be very very wrong. Check the thread sticky for the correct math.

Hi, sir.

Thank you for the information. Btw, what is a good value for crosstalk area for lowest input lag. Im playing CSGO. is 35 good? or 30 for brighter image.

[Falkentyne]

At 120hz with a VT? No. You want the strobe phase (=Area) as high as possible as you can get, before either the backlight shuts off (e.g. <50) or at whatever point is not too dim for your eyes. Note that (with a VT tweak applied), Strobe Duty + (max allowable Strobe Phase) equals the backlight shutoff point. (a higher value of strobe duty at this point will have no effect).

Example: If backlight shuts off at Phase=50,
If strobe phase is 44, Strobe Duty will only work at values 1-6. (44+6=50). Values 7 or higher will be the same as 6.

If Strobe Phase is 042, Strobe Duty will only work at values of 1-8 (42+8=50). Values 9 and higher will have no effect.

(At 100hz + VT 1500 tweak, backlight shuts off at Strobe Phase=060.
So, with a strobe phase of 052, Strobe duty "Max" is 008. Because 052+008=60).

This limitation does not apply when NOT using a VT tweak. (seems to be how the firmware works).

Since I don't own any of the newer "Realtek 2796BF" based Benq models, I have no idea if they work the same way (I do know VT tweaks to reduce crosstalk work on them, but more, you should ask Chief blur buster).