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LightBoost, G-SYNC, Turbo240: 120Hz Strobe Backlight LCDs / No Motion Blur! - Page 132

post #1311 of 2929
Quote:
Originally Posted by socketus View Post



what's this BFI gaming ? BFI only appears on this page....

Something I came up with on the spot. It doesn't exist afaik, but here's the basic idea:

Software BFI is only useful if you have a situation where you cannot reach the full refresh rate of the monitor - so video and gaming. For those of us who can't hack Lightboost, and our GPUs can't push 120fps, I'd like for games to limit to 60fps and insert black frames between each, thus giving much lower motion blur, with little to no extra work for the GPU.
post #1312 of 2929
Thread Starter 
This could be theoretically done at the driver level.

Basically the nVidia drivers could be tricked into thinking the display is only 60Hz while the display is actually 120Hz. And the drivers inserts black frames in between the "60Hz refreshes". Then all games would work, no matter which game, as the game would think it's outputting to a 60Hz monitor.

The drivers would be doing the BFI for motion blur reduciton, in a manner similiar to www.testufo.com/#test=blackframes by using this same type of technique for 60fps @ 120Hz.
post #1313 of 2929
Quote:
Originally Posted by mdrejhon View Post

This could be theoretically done at the driver level.

Basically the nVidia drivers could be tricked into thinking the display is only 60Hz while the display is actually 120Hz. And the drivers inserts black frames in between the "60Hz refreshes". Then all games would work, no matter which game, as the game would think it's outputting to a 60Hz monitor.

The drivers would be doing the BFI for motion blur reduciton, in a manner similiar to www.testufo.com/#test=blackframes by using this same type of technique for 60fps @ 120Hz.

Wow, if you could find a way to pull off such a trick I'd be extremely impressed. Or we could just ask Nvidia and AMD nicely rolleyes.gif

Would it work with stuff like the Qnix and X-Star though?
post #1314 of 2929
Thread Starter 
Quote:
Originally Posted by Moragg View Post

Would it work with stuff like the Qnix and X-Star though?
To a certain extent, yes. About 50% motion blur reduction, making 60fps@120Hz look like 120fps@120Hz.
However, it will very most dramatically benefit 60fps on LightBoost, because you get the full LightBoost effect at 60fps this way.

There are numerous issues with AMD and nVidia wanting to support software-based black frame insertion at the driver level:
-- BFI can dim the image;
-- BFI can add flicker (not bad at 60fps@120Hz or 72fps@144Hz)
-- You're repeatedly turning on/off LCD pixels at the panel level. If pixel transitions are slow, that can cause BFI to reduce contrast severely.
-- You're running an interference with the LCD inversion voltages (alternating positive/negative values). This can cause LCD image retention.

The most likely thing to happen is a system tray utility that adds flicker, but it would require precision hooks into the drivers, or extremely high priority (e.g. Administrator-level Real-Time CPU priority). But games will still be playing as if it was outputting to a 120Hz monitor which will create some problems. For example, some frames will be rendered out-of-phase with the black frame insertion, and thus be uselessly hidden out-of-sync with the flicker. So there will be strange motion artifacts (moments of increased judder) whenever the frames are out-of-phase with the flicker. But it will do a great job of eliminating motion blur in VSYNC-enabled 60fps games and emulators that ran at a smooth 60fps. Those will be the ones that benefit the most from an external third-party BFI utility. (Maybe we can ask ToastyX or others nicely).
post #1315 of 2929
CallsignVega - So the TE isn't good for lightboost?
post #1316 of 2929
Quote:
Originally Posted by rfisher983 View Post

CallsignVega - So the TE isn't good for lightboost?

Not when you can get a VG248QE for $250. I'd only get the TE if I plan on using the 144 Hz regular mode for it's zero-PWM. It's the only monitor that can do that. thumb.gif
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post #1317 of 2929
Quote:
Originally Posted by CallsignVega View Post

Not when you can get a VG248QE for $250. I'd only get the TE if I plan on using the 144 Hz regular mode for it's zero-PWM. It's the only monitor that can do that. thumb.gif

I'm currently on a XL2410T and don't mind paying extra for for the XL2420TE.

"As for the XL2420TE, I would not recommend the monitor if you are going to be using Lightboost mode. The Zero-PWM feature does not help here and it's $150 more than the VG248QE. The Xl2420TE did look fine in normal 144 Hz mode and didn't have the huge blacks/contrast issues. It will be up to you if the zero-PWM flicker feature is worth the extra $150 and you want to run normal non-Lightboost 144 Hz."


Does the light boost on the XL2420TE perform the same as the other models or significantly worse?

What does the zero -PWM flicker actually do?
post #1318 of 2929
Thread Starter 
Quote:
Originally Posted by rfisher983 View Post

I'm currently on a XL2410T and don't mind paying extra for for the XL2420TE.

"As for the XL2420TE, I would not recommend the monitor if you are going to be using Lightboost mode. The Zero-PWM feature does not help here and it's $150 more than the VG248QE. The Xl2420TE did look fine in normal 144 Hz mode and didn't have the huge blacks/contrast issues. It will be up to you if the zero-PWM flicker feature is worth the extra $150 and you want to run normal non-Lightboost 144 Hz."


Does the light boost on the XL2420TE perform the same as the other models or significantly worse?

What does the zero -PWM flicker actually do?

What I interpret Vega as saying is that the XL2420TE, the VG248QE and the XL2411T, are all the same in terms of LightBoost quality.
Just that the 27" monitors (XL2720T, VG278H/HE) are known to have much better LightBoost color quality.

The zero-PWM feature is for non-LightBoost mode -- it uses DC-based backlight dimming, rather than PWM-based backlight diming.
post #1319 of 2929
Excuse me i have some questions about xl2420te :

1 - Have this model a good calibration to standard preset ?
2 - Can you see evident banding effects ?
3 - With flickering is deleted also in lightboost mode ?
4 - THE MOST IMPORTANT QUESTION : What is the minimum brightness ? ( the XL2420T and XL2411T had an high minimum brightness and its not so good for users like me that have a sensible eyes ).
post #1320 of 2929
Quote:
Originally Posted by senna89 View Post

Excuse me i have some questions about xl2420te :

3 - With flickering is deleted also in lightboost mode ?
4 - THE MOST IMPORTANT QUESTION : What is the minimum brightness ? ( the XL2420T and XL2411T had an high minimum brightness and its not so good for users like me that have a sensible eyes ).

3- he already answered this one, please search before you ask. It's literally a few posts above lol.
4- probably similar, it's the same panel as the XL2411T AFAIK
Your eyes are probably sensitive to PWM backlighting, not the brightness. I use the XL2420T on Brightness set to 6 and it's perfect. I also have sensitive eyes.
    
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