Chief Blur Buster wrote:jigoku wrote:I'm still getting a bit of corona/blur in the bottom half of the screen, and cannot seem to find any commands over the ddc protocol, where i may be able to adjust the strobe phasing, which i have heard helps with other monitors having this effect on part of the screen. I'll keep on the look out for more solutions though.
Non-Strobed Mode
If you're using non-strobed mode, it's possible that panel heating may be affecting pixel transition speeds asymmetrically on different parts of the panel. The power supply is usually hidden behind the bottom edge of the panel, which makes the bottom edge of panel hotter, which can cause ghosting to look different. Cold LCDs will ghost differently from hot LCDs. But this can affect the same panel surface if one part of the panel is cold and the other part of the panel is hot.
For Strobed/LightBoost Mode
This is simply strobe crosstalk, the asymmetry between the top-to-bottom LCD scanout versus the all-at-once strobe flash. For more reading, please see
Advanced Strobe Crosstalk FAQ. It is normal for the top/bottom edge of LightBoost to have much more ghosting then the rest of the panel. For monitors that have adjustable strobe phase (BenQ/Zowie monitors) it is possible to put the crosstalk band somewhere else in the screen (e.g. even the middle!)
Thanks for the explanations. I've had a look at that page previously on strobe crosstalk. You mention heat issues, i assume that could be part of it, as the monitor does get mildly warm at the bottom, the casing behind protrudes half way down the back where the connectors are etc, and generates a little bit of heat. However, this doesn't seem to affect the 144hz non-light boost mode (there is normal ghosting/coronas as expected with the tests which are equally present across the entire screen).
For crosstalk, it seems this monitor doesn't support configurable crosstalk settings. I've tried exploring the DDC features using `ddcutil probe` on Liunux, and also checked out the manufacturer(?) menu (by holding down the menu button whilst powering on), but doesn't offer anything related to that.
There does seem to be some settings that can't be adjusted however;
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Feature xe0 - Manufacturer Specific
Feature xe1 - Manufacturer Specific
Feature xe7 - Manufacturer Specific
Feature xe9 - Manufacturer Specific
Feature xeb - Manufacturer Specific
Feature xfa - Manufacturer Specific
I figured out that 0xfa is the feature to adjust lightboosts brightness, but the other undescribed features don't seem to alter anything. I did read that most lightboost monitors don't actually support adjusting the crosstalk/strobe/phasing settings, as they are allegedly pre-tuned at factory.
Either way, this monitor is more than usable for now. Whilst there is corona/blur on the bottom half of the screen using lightboost, it's not actually noticeable in any gaming or fast camera-panning in any videos.
PS; there were two other features discovered by `ddcutil probe`
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Feature x20 - Horizontal Position (Phase)
Feature x30 - Vertical Position (Phase)
I'm not sure if they are relevant to crosstalk/strobe, as they cannot be written to over DDC.
Maybe Acer locks out this setting from being adjustable?