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post #231 of 2929
LEDs are binned in the same way as CPUs. You will get different backlight quality even between identical monitors.

LightBoost is achieved by over-driving the LED backlight with more power, which will naturally change it's colour output.
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post #232 of 2929
Quote:
Originally Posted by whybother View Post

LEDs are binned in the same way as CPUs. You will get different backlight quality even between identical monitors.

LightBoost is achieved by over-driving the LED backlight with more power, which will naturally change it's colour output.
So I guess this explains why some monitors have a lot of colour shift and others have hardly any.
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post #233 of 2929
Mine and Swolern's (3) VG278H seem to be perfect. So far I know Vegas 144hz BenQ and my 144hz HE both have the reddish tint problem. Could be a common factor

In other news I just hooked up my old U2311H and boy is it beautiful. Lets you truly appreciate how good the IPS colours are. Right now I feel like if you don't play FPS I would recommend IPS and IPS alone! Of course if you can sacrifice the smooth mouse movement on the desktop too..
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post #234 of 2929
Quote:
Originally Posted by hamzatm View Post

Mine and Swolern's (3) VG278H seem to be perfect. So far I know Vegas 144hz BenQ and my 144hz HE both have the reddish tint problem. Could be a common factor

In other news I just hooked up my old U2311H and boy is it beautiful. Lets you truly appreciate how good the IPS colours are. Right now I feel like if you don't play FPS I would recommend IPS and IPS alone! Of course if you can sacrifice the smooth mouse movement on the desktop too..

I agree. A TN panel is hard to swallow after using other LCD types. Especially ones with matte coatings. (The Samsung TN's with gloss coating had a pretty good image).
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post #235 of 2929
Thread Starter 
Quote:
Originally Posted by hamzatm View Post

OK I've tested the VG278H vs VG278HE side-by-side in 3D and 2D LB and here are the results:

VG278HE screen has reddish tint in LB mode, darker too - perhaps the redness makes it look a little darker?
Ghosting is a vivid purple or white (depending on whether it ghosts a dark colour on light background or ghosts a light colour on a dark background). Is very noticeable, jumps out at you - can't fail to notice it. Stands out stark against the background.
When moving straight lines (e.g. vertical lines moving to the right and left), they fuzz badly, have blue/red fuzzy tints to them and basically looks terrible, like white noise on a TV set. Most noticeable with a vertical blue/red edge.

VG278H screen looks natural and bright in LB mode
Ghosting from dark colours is faint and not that noticeable unless you look for it. It is unobtrusive. Because the colour of it is so light it blends in with the background.
Straight lines move smoothly like they should, and appear like straight lines. No fuzziness to be seen.
Wow, I did not anticipate such a difference between the VG278 and the VG278H! Shocking, indeed. Not even a defective panel?

If the ghosting you see has LOTS of very intense checkerboard-pixel effects, that's a more unbalanced LCD inversion (explanation) than usual. (LCD inversion patterns are usually vertically-stretched checkerboard patterns on most monitors). These leads to very harsh appearances in moving lines that moves at an odd number pixels horizontally per second. (e.g. a 1-pixel-thick line moving at 5 or 7 pixels per second horizontally). You can load the Lagom LCD inversion/pixel-walk pattern then drag the window around -- you'll see a lot of strange flickering effects in some of the fine-pixel checkerboard. My BENQ XL2411T, interestingly, has much less effects than the VG278H, despite the BENQ having a crimson tint.

For your VG278HE, does these differences persist even during 100Hz LightBoost?
Edited by mdrejhon - 1/26/13 at 11:09pm
post #236 of 2929
Thread Starter 
Quote:
Originally Posted by whybother View Post

LEDs are binned in the same way as CPUs. You will get different backlight quality even between identical monitors.

LightBoost is achieved by over-driving the LED backlight with more power, which will naturally change it's colour output.
Good theory, but....no.

I've successfully determined that this is NOT the cause. What I have been able to determine, for my BENQ XL2411T crimson tint, is that this is a digital modification of the red/green/blue gamma curve. I'm not sure why. For example, black is completely neutral (no reddish tint in a black screen). Also, adjust Contrast adjusts the intensity of the tint (some colors become a little yellowish). Perhaps this is a tint-compensation for 3D shutter glasses, to make colors look better looking through 3D shutter glasses -- which might have a greenish tint -- and a magenta tint compensates for this. LightBoost was designed originally for 3D.

BTW, it was possible to digitally undo some of the reddish tint via a custom display profile on the PC side of things. The reddish tint on my BENQ XL2411T is gone (though I wish I had 10-bit LUT's rather than 8-bit LUT's!)

Other than that problem, the BENQ XL2411T (1ms) is distinctly better at having no motion trail -- it has nearly zero crosstalk between refreshes between most GtG colors.
Edited by mdrejhon - 1/26/13 at 11:10pm
post #237 of 2929
Quick n00b question... is this hack do-able with an AMD card? My guess is no. No 3D = no hack?
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post #238 of 2929
Quote:
Originally Posted by mdrejhon View Post

Good theory, but....no.

I've successfully determined that this is NOT the cause. What I have been able to determine, for my BENQ XL2411T crimson tint, is that this is a digital modification of the red/green/blue gamma curve. I'm not sure why. For example, black is completely neutral (no reddish tint in a black screen). Also, adjust Contrast adjusts the intensity of the tint (some colors become a little yellowish). Perhaps this is a tint-compensation for 3D shutter glasses, to make colors look better looking through 3D shutter glasses -- which might have a greenish tint -- and a magenta tint compensates for this. LightBoost was designed originally for 3D.

BTW, it was possible to digitally undo some of the reddish tint via a custom display profile on the PC side of things. The reddish tint on my BENQ XL2411T is gone (though I wish I had 10-bit LUT's rather than 8-bit LUT's!)

Other than that problem, the BENQ XL2411T (1ms) is distinctly better at having no motion trail -- it has nearly zero crosstalk between refreshes between most GtG colors.

I'm looking to buy a BenQ soon. Mind sharing your color profile? I know a profile won't necessarily look the same on every monitor, but it's a start.
    
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post #239 of 2929
Quote:
Originally Posted by mdrejhon View Post

Wow, I did not anticipate such a difference between the VG278 and the VG278H! Shocking, indeed. Not even a defective panel?

If the ghosting you see has LOTS of very intense checkerboard-pixel effects, that's a more unbalanced LCD inversion (explanation) than usual. (LCD inversion patterns are usually vertically-stretched checkerboard patterns on most monitors). These leads to very harsh appearances in moving lines that moves at an odd number pixels horizontally per second. (e.g. a 1-pixel-thick line moving at 5 or 7 pixels per second horizontally). You can load the Lagom LCD inversion/pixel-walk pattern then drag the window around -- you'll see a lot of strange flickering effects in some of the fine-pixel checkerboard. My BENQ XL2411T, interestingly, has much less effects than the VG278H, despite the BENQ having a crimson tint.

For your VG278HE, does these differences persist even during 100Hz LightBoost?

I am not entirely certain that it isn't defective, but the 2D functions and 3D functions all look and work fine (or as close to fine that I don't feel there is any problem with them), the only issues appear with the LightBoost hack. I mean I didn't notice the crimson tint until I stood the thing side-to-side with my VG278H - for all I know the VG278H has a negative crimson tint! wink.gif

Thanks for the info about LCD inversion. I can have a check with 100Hz LightBoost, probably report back in a few days.
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post #240 of 2929
Thread Starter 
Quote:
Originally Posted by hamzatm View Post

I mean I didn't notice the crimson tint until I stood the thing side-to-side with my VG278H
Quote:
Originally Posted by PiERiT View Post

I'm looking to buy a BenQ soon. Mind sharing your color profile? I know a profile won't necessarily look the same on every monitor, but it's a start.

The BENQ XL2411T Crimson Fix
(may work with VG278HE)


Zero crimson tint with BENQ LightBoost!
On the subject of BENQ color calibration, I cancel out the crimson tint via nVidia Control Panel, by doing the following:

Monitor OSD
Monitor's Contrast Setting = 48 .... (NOTE: Not applicable to ASUS)

nVidia Control Panel - "Adjust Desktop Color Settings"
Adjust them individually, R, G, B.
---
R Contrast = 30%
G Contrast = 50%
B Contrast = 30%
---
R Brightness = 10%
G Brightness = 50%
B Brightness = 10%
---
R,G,B Gamma = 1.05 (...or a higher value, but set all of them to the same value).

Test Patterns Used
-- Lagom Contrast Pattern
-- Lagom Black Level
Edited by mdrejhon - 1/27/13 at 6:09pm
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