XL2430T Firmware Information

Adjusting BENQ Blur Reduction and DyAc (Dynamic Acceleration) including Blur Busters Strobe Utility. Supports most BenQ/Zowie Z-Series monitors (XL2411, XL2420, XL2720, XL2735, XL2540, XL2546)
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djriful
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Re: XL2430T Firmware Information

Post by djriful » 10 Dec 2014, 00:56

I will try it again, by the way. To answer one of your question on Lightboost vision 2.0

XL2430T has no 3D support, i tried to turn it on.. my screen just go black.

http://www.monitortests.com/forum/Threa ... 43#pid3343

Falkentyne
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Re: XL2430T Firmware Information

Post by Falkentyne » 10 Dec 2014, 01:13

The screen goes black?
That shouldn't happen at all.
Even if you use the vertical totals which 'signal' lightboost to be used, 1138 VT for 100 hz, 1143 VT for 110hz and 1149 VT for 120hz, if lightboost were not available for some reason, you would simply have a custom refresh rate with a 1138 or 1149 VT. (That's what happens if you try to enable lightboost on an AMD card without unlocking it first, on a 2720Z or VG248QE...nothing but a normal display.

How does your screen go 'black'?

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djriful
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Re: XL2430T Firmware Information

Post by djriful » 10 Dec 2014, 01:19

Oh, nevermind. It didn't go black screen anymore.

So if I use the Lightboost is basically similar same as I use VT Tweak? If so which one is better? I have Nvidia GTX TITAN here.

error-id10t
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Re: XL2430T Firmware Information

Post by error-id10t » 10 Dec 2014, 02:16

So hang on, do I need a Pixel fixer with pixel clock of 374.4? My screen is working just fine... but is it dropping frames or what?
4790K (Broke)
G3258 (@ x48, little beast)
970 G1 Gaming SLI (returned, lacking vRAM for some reason..)
iGPU (waiting for AMD to deliver something nice)
XL2411Z (firmware V4 thanks to people here)

Falkentyne
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Re: XL2430T Firmware Information

Post by Falkentyne » 10 Dec 2014, 03:32

@error:
ANY pixel clock past 330.00 REQUIRES the pixel clock patcher! If you are not using it, then it's using the DEFAULT VT (ignoring your custom resolution completely and using the EDID) or in some cases, if you go too high, the refresh rate simply vanishes.
djriful wrote:Oh, nevermind. It didn't go black screen anymore.

So if I use the Lightboost is basically similar same as I use VT Tweak? If so which one is better? I have Nvidia GTX TITAN here.
Vt tweak tries to force a 'faster' scanout by accelerating the update process of the LC panel. What you're doing is making the vertical synchronization phase *longer* (e.g. from 1125 lines to 1500 lines) at the same refresh rate. I'll try to explain the easy way. I'm sure ToastyX or Chief can jump in and correct me.

The monitor is currently calibrated to have a vertical sync total of 1125 lines
The strobe pulse is based on the # sync lines (someone correct me fiercely if I'm wrong here), so at a strobe phase setting of 000, the first strobe pulse occurs at the top of the synchronization phase, which is at the very top edge of the screen, and the NEXT strobe pulse occurs close to the bottom of the screen, but not all the way at the bottom. So with a strobe pulse of 000, you get a reasonably clean top edge, with some parts of crosstalk showing, and a double image thick mess close to the bottom.

Now, by increasing the vertical total, you are now INCREASING the size of the vertical synchronization area. Display-corner calls it "making the vertical synchronization phase LONGER". By doing this, you make the strobe pulse at the top start at the same spot, but the strobe pulse for the next frame start closer to the bottom, and in case of VT 1500, actually pushing the next phase just barely OFF the screen, because by extending the synchronization phase, the next strobe pulse is now offscreen and you have more of the screen area (1080 lines) visible without both crosstalk border pulses on the screen. You are not extending the SIZE of the screen vertically, pixel wise...just the synchronization. I think you can see that this also increases the pixel clock, since now the screen must "work harder."

I'm sure chief can once again correct me, but I think this is almost the same thing as changing the "Vertical hold" on old analog TV's, except on those, instead of changing the vertical hold 'position", now you're actually changing the SIZE of it.

The drawback of this method is the monitor gets confused by the strange timings and switches to the 60hz backlight pulse widths, and plays havoc with the "display mode' settings, and may show faint horizontal line inversion type artifacts on the screen, not from the dot clock directly, but from being pushed to its limits.

Also, because the vertical synchronization phase is longer, changing the strobe pulse now has more of an effect position wise, on the screen, on the strobe pulse, per "point", than without the VT tweak. That is, the strobe boundary moves FARTHER down per pulse (area) value, which makes complete sense ! Because the sync phase is now LONGER, and you're moving the pulse start between sync phase positions, NOT between "pixels" on the monitor.

A strange drawback to this is that now, changing the strobe DUTY (persistence) to a higher value actually makes the TOP crosstalk boundary move down farther (per point) than it would without the VT tweak, also, so for instance, using a persistence of 2.5ms at 120hz to give a bright screen, would push the top strobe pulse down too far and make the top of the screen look nasty (during motion), while without a VT tweak, you can keep it looking decent (but at the expense of the bottom, again).

But continuing : by using a VT 1500 tweak, when you go past strobe phase 047, you are actually going PAST what strobe phase 100 would do, WITHOUT the VT tweak, aka extending the first strobe pulse past the location where the second (bottom) one would start by default. Masterotaku found out that when this happens, you are now rendering one frame "ahead" (1 frame of input lag reduced) BUT the persistence now starts getting lower, because the strobe phase is pushed past where its supposed to go. So at strobe phase 059, you now have a 0.167ms persistence (this would be identical to strobe phase 000 with strobe duty 001 and a VT tweak, except you are one frame ahead (input lag slightly improved). I'm sure you can figure out exactly what happens if you go from 059 strobe phase to 060.


----------------------

Lightboost does basically the same thing, but instead of increasing the vertical synchronization phase time (making it longer), it updates the LC panel timings directly, through hardware, which force the scanout to complete faster (which basically results in the same thing happening; the top of the strobe pulse being at the very top and the bottom being off screen), and has even _more_ of an effect (since it's tweaking the LC panel directly) than a VT 1502 tweak. This puts even MORE stress on the panel than a VT tweak, so you may find even stronger inversion scanline-type artifacts (NOT talking about the pixel transition/gray/green ones you can test for on lagom) than with the VT tweaks.

Lightboost also has per-line overdrive as well, to improve the inverse ghosting/normal ghosting performance, so that's even more work for the panel.

Which is better?
VT with BBR, or Lightboost?

For 3D games, especially FPS, VT tweak for sure--no loss of color fidelity, no loss of contrast ratio, no pink tints, full ability to tweak the image quality

For 2D games: lightboost can be better, because ghosting is usually more apparent here, and lightboost's per line overdrive--ESPECIALLY with contrast "0", greatly improves things by a large margin on the 27" screens, and removes any advantage Tracefree's overdrive (OD Gain in the service menu, for lightboost mode) had on the 24" VG248QE vs the 24" Benq screens. This depends on the game and the color transitions, of course.

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djriful
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Re: XL2430T Firmware Information

Post by djriful » 10 Dec 2014, 12:22

Yeah I understand.

VT1500 do get some weird faint horizontal line like you said on grey color which is more visible but none on VT1350.

Newer games works will with the custom resolution but some don't which is weird because the screen goes 50% brightness. There are no option in game to set which Hz to use as (to pick 120Hz for the VT tweak).

Falkentyne
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Re: XL2430T Firmware Information

Post by Falkentyne » 10 Dec 2014, 16:50

They're still there at VT 1350 (just switched to it to test) but they're much fainter and mostly around the top of the screen and only barely noticeable on some color shades. No one would notice them unless they knew what to look for. Much easier to see the lines at VT 1500 and even easier with lightboost (its the same line pattern); lightboost has it the worst.

I get the same lines on my VG248QE's lightboost, except the lines are visible at the bottom of the screen also.

error-id10t
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Re: XL2430T Firmware Information

Post by error-id10t » 10 Dec 2014, 17:22

Thanks Falkentyne, well I hadn't done it because I can see the VT increase brightens my monitor so thought it was all good and working as expected. Ran the tool and it told me it needed patching, ran the "full" to cover off SLI and now that's done, though I don't see a difference beyond "knowing" it's now at least 100% working. Little weird but thanks again.
4790K (Broke)
G3258 (@ x48, little beast)
970 G1 Gaming SLI (returned, lacking vRAM for some reason..)
iGPU (waiting for AMD to deliver something nice)
XL2411Z (firmware V4 thanks to people here)

Falkentyne
Posts: 2793
Joined: 26 Mar 2014, 07:23

Re: XL2430T Firmware Information

Post by Falkentyne » 10 Dec 2014, 21:53

The VT tweak doesn't directly 'increase' the brightness of strobing.
and I don't know if it's by 'design' or not, but the monitor uses the 60hz backlight pulse widths when the VT tweaks are being used. Basically, the persistence is higher with the VT tweak than without it, and the higher persistence=higher brightness. You can see on this chart:

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

Notice that at 100hz, without the VT tweak, the lowest persistence (at strobe duty 001) is 0.1ms, so 1.0ms is strobe duty 010.
With the VT tweak, its 0.167ms, because it's using the 60hz pulse widths, (1.0ms is now strobe duty 006) so you use the chart for 60hz instead of for 100hz. The increase in persistence because of the strobe widths is the brightness increase.

I'm going to try using the VT tweak 1350 on the VG248QE and see what happens, for boredom. I only tried it once (VT 1500) and it said out of range.

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djriful
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Re: XL2430T Firmware Information

Post by djriful » 11 Dec 2014, 15:44

The downside for me with VT 1350/1500 at strobe 06, the image will have small amount of blurs.

VT1350 has no artifacts moving pixel but VT1500 does. Even it is the same panel, I don't have those at 1350 maybe XL2430T has some improved hardware chip behind the screen.

edit: so I set the duty at 010, that's about 0.166ms, bright monitor and barely blur without crosswalk much as without VT tweak. Would this be any issues in the long run? I felt like what you told me, that we need to be on 06 duty to maintain 1ms.

Honestly, I do not know what is good for having 1ms or 0.166ms.

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