Falkentyne wrote:P.S. NEVER set contrast to 100. That just murders the white point and you get massive color crushing.
43 looks best on my 2720Z (50, the maximum white point correct level just increases ghosting too much).
What you can do is toggle the AMA like me and masterotaku mentioned.
Set MBR to on, first
Go to AMA, press button 3 (Enter) on AMA so high is highlighted
Then press Back (button 2 or 4 idk which), pressing enter again acts as a cancel instead of a toggle.
(or you can just move the AMA to premium/off and back to high, that works too).
This will decrease the amount of AMA intensity by a small amount.
The effect will be more noticeable the lower the refresh rate is.
Anyway, the reason for the crosstalk at the top:
That's because the strobe duty reset after your flash. The higher the value of strobe duty, the more crosstalk will be at the top of the screen. V4 did not change this. The behavior is identical on V2, V3 and V4 (V1 did not have adjustments).
With strobe phase at 000, raising the strobe duty past 003 will result in crosstalk appearing at the top of the screen, and getting lower slowly, as you increase the strobe duty (strobe duty controls the persistence-the lower the value of strobe duty, the more blur reduction you will have, but the dimmer the screen). this also lowers the bottom crosstalk by the same amount, sort of like adjusting the V-hold knob on an old analog TV as an analogy). So, raising the persistence (reducing the amount of blur reduction, which also increases the brightness) will cause the crosstalk at the top to drop downwards. Changing the strobe PHASE changes the position of the top and bottom crosstalk by a -much- larger amount.
The default strobe duty is 010-020 (not sure which)and the default strobe phase is 100, after a full hardware reset.
The reason for this is that this improves input lag (by 1 frame) compared to strobe phase 000 and keeps the top of the screen crosstalk free, to mimic Lightboost behavior. But strobe phase 100 has the bottom of the screen sort of a mess.
(with a VT 1502 tweak and 120hz, the maximum strobe phase is 049 or 050. 051 will set the persistence to 0ms and shut off the backlight, as the lowest possible persistence is 0.167 ms with a VT tweak and 0.08 ms without).
You probably set strobe phase back to 000 (if using vertical total tricks (VT 1350 or VT 1500), using a strobe phase higher than 047 to 059 will shut off the backlight if MBR is enabled) this depends on refresh rate.
Not sure why raising the strobe duty also causes the crosstalk at the top of the screen to drop downwards, when usually it's the strobe phase that is supposed to control that. It's sort of funny that in Lightboost mode, changing lightboost from 10% to 100% (which is basically the same thing as raising strobe duty on MBR mode, does not change the crosstalk at the top of the screen. But Lightboost mode uses "per line overdrive" and "LC panel accelerated scanout" while BenQ MBR does not. But if you want the top of the screen to have NO crosstalk, while having a higher strobe duty (brighter screen, but less blur reduction), you can raise the strobe phase to 100, and then raise the strobe duty. (if using a VT tweak, the strobe phase limit will be much lower).
Read masterotaku's post on what happens when you set a high strobe phase with a VT Tweak. After a certain point, when you increase the strobe phase past a certain value, the strobe duty actually decreases internally, even though the actual value for strobe duty does not change, which mean as the phase (crosstalk) keeps dropping downwards, the persistence starts getting lower (more MBR). Go too far and the persistence drops to 0=black screen (Only if MBR is enabled).
He mentions that here: viewtopic.php?f=13&t=560
So to summarize, if you want the top of the screen with NO strobe phase crosstalk, and are NOT using a VT Tweak, set strobe phase to 100 then adjust strobe duty to whatever you want. If you ARE using a VT Tweak and want the top with NO crosstalk, set the strobe phase to the value right before the backlight shuts off. This value (050 at 120hz/VT 1502) will give you 001 strobe duty, even though the real duty value hasn't changed in the service menu. That will be 0.167ms persistence. You will notice that changing the strobe duty value will do nothing now.. Setting strobe phase to 049 will give you either 0.167ms or 0.333ms persistence (strobe duty 001 and 002 will work, anything higher will be locked at 0.333ms. Setting strobe phase to 048 will give you 0.167, 0.333 or 0.5 ms (duty 1, 2 and 3 will work), and so on.
At 100hz, VT 1502, this limit is 059 strobe phase.
At 91 hz (custom refresh rate for call of duty advanced warfare), this limit is 065 strobe phase (I think).
At 125hz (VT 1498) this limit is 047 strobe phase.
The SINGLE STROBE setting was fixed in V4 (The "Off" setting was sort of bugged in V2, and affected 100-144 hz incorrectly, while "On" worked correctly). In V4, single strobe on/off only affects refresh rates LOWER than 100hz.
All refresh rates (including custom) lower than 100hz will DOUBLE strobe if single strobe is off, and will single strobe at a default duty/phase value, without adjustments possible, if using a VT Tweak. At 100hz and higher, this setting is always considered ON (turning it off has no effect).
In V2, at 100+hz, if single strobe were set to off, sometimes when turning on MBR, it would use default strobe values instead of the custom values even at 100-144 hz, until strobe duty/phase or brightness was changed afterwards (this was fixed in V4 so that SS off is ignored at 100+hz). This is the reason why the blur busters utility turns on the single strobe checkbox (Customization option) when making any slider adjustments automatically.
Falkentyne wrote:The newest shipments from Benq come with V4 firmware, but the only way to guarantee that is to order from Benq's own web shop and to talk to a CS Rep and to tell them specificially that you want your monitor flashed with version 4 firmware.
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