kyube wrote: ↑25 Apr 2022, 16:17
How does one turn on FRC, as it's seemingly disabled judging by the picture provided? Is this some kind of driver error or is the monitor just 6bit instead of 6bit+FRC(bit)?
Oh, and how come the panel is a BOE now? Does a 23.8" 240hz Innolux panel and/or AUO panel exist?
GPUs can also support temporal dithering. NVIDIA drivers supports temporal dithering on the GPU driver side too, and requires a registry tweak to fully disable. "FRC" and its variants (temporal dithering) can be done either GPU-side or monitor-side.
If you don't see banding at
lagom gradient on a 6-bit panel, then either the GPU or the monitor is executing a form of temporal dithering which is simply flickering pixels in roughly 1/64th brightness modulations every 1/240sec refresh cycle. That's a much fainter flicker (<1%) than PureXP, so if you don't have eyestrain with PureXP 240Hz, then FRC almost definitely isn't the cause of your eyestrain.
However, it was also confirmed that FRC is usually a major red herring (i.e. falsely blamed for eyestrain) when other things such as polarization and antiglare film was the actual cause. Although isolated cases of FRC-derived eyestrain exists, the FRC on a BenQ XL25XX series is much more intense than the FRC on an XG2431 or via NVIDIA GPU. So it's often a wild goose chase to obsessively blame FRC (>99% of the time at least).
Sometimes odd things happen, like how sitting a few inches closer to the monitor sometimes increases eyestrain for some people -- and smaller screens (23.8" vs 27") often cause people to sit closer, triggering an unexpected cause of eyestrain. But it depends on if you're farsighted or nearsighted, and if you've been used to a specific screen size in the past.
Other times, it was traced to mudane causes like the speckle of an antiglare film (far more common cause of eyestrain than FRC), which was fixed by going to an Apple screen (glossy) or a different texture of antiglare.
Yet other times, wearing orange-tinted computer glasses (superior to electronic "low blue light" settings), was the only solver for a specific individual.
LCD screens emit polarized light because of the technology they use. Another individual reported their eyestrain disappeared when their polarization changed (e.g. switched between IPS <-> TN,
OR by rotating a rotatable screen 90 degrees to portrait mode) -- horizontal polarized light versus vertical polarized light -- can create different eyestrain behaviors in different individuals. Try spending an hour doing web browsing/work at both orientations. See which orientation reduces eyestrain. Little study has been done on this, but LCDs emit polarized light, due to the way the screens work. Most people are polarization-insensitive but some have reported more eyestrain with bright polarized light of a specific orientation (e.g. horizontal). That's why people wear polarized sunglasses and say that they often reduce eyestrain, even sometimes in non-glare-related situations, by staying away from their most uncomfortable polarization sensitivity. But polarization sensitivity for screens is fairly rare, and is often fixed by rotating polarization or switching to a non-polarized technology such as a 42", 48" or 55" LG OLED TV as a computer monitor.
So make sure to test your vision issues with multiple screens -- antiglare film vs glossy, strobed vs nonstrobed, TN vs IPS vs OLED, potrait vs landscape to changes polarization angle, different brightnesses, different view distances, overdrive settings, different Hz settings, smoothing the stutters via driver settings, low blue light (via electronic setting and via orange-tinted computer glasses), etc.
We have as many people who told me XG2431 reduced their eyestrain, so I can be the bearer of the bad news no two humans sees things exactly identically to each other -- vision, prescription, color sensitivity, flicker sensitivity, stutter sensitivity, tearing sensitivity, Hz sensitivity, etc.
Everybody's cause of eyestrain is different from each other -- and there's more than a dozen eyestrain-causers in any computer monitor on the market -- so you have to iteratively test your vision to find what works best for you.