FYI it's not just LG-produced IPS panels, afaik AUO produced (misleadingly named 'AHVA') can be affected too.RocketBelt wrote:I suffered the bob deinterlace LG ips image retention issue again. I was messing with settings and did a firmaware update and didn't notice that my ossc had gone back to the default 480i/576i bob deinterlace setting. After only a short time (half an hour) on a game that has static elements on screen, these parts of the image were 'burned in' (also described as image retention or after-flicker) very clearly, and the set has been off all night but it is taking a long time for this effect to fade away this time. I've seen one other user reporting this issue in this thread, and this is potentially a very nasty issue for users of LG ips panels.
Marqs and bucko:
1. There should be at least a few lines on the ossc wiki warning about bob deinterlace causing image retention or after-flicker on LG ips.
2. At least consider making 480i/576i passthrough mode the default setting in future firmwares.
The degree of sensitivity also seems to vary a lot, I've been using an LG IPS for several months (and it's definitely not my first, I've owned a number of IPS displays over the years)
And though I don't quite often play games that switch the OSSC to bob-deinterlacing mode so when it triggers it's only for short moments in menu screens, with that kind of usage I haven't noticed the slightest hint of persistence yet.
Some panels though show marks almost immediately, I've seen it, so the panel's model matters but as long as we don't know the cause it's impossible to track and prevent considering Manufacturers make many different ones they either renew or change almost every year without much notice.
But most importantly: it's not necessarily inherent to IPS only, some VA panels can show a degree of retention too, although it's more rare and they seem distinctively less prone than IPS in general.
Using bob-deinterlace mode on fixed items for many minutes or even hours straight it is likely that a number of VA display will suffer too. And don't take for granted that TN panels will never show any if exposed to that sharp strong flickering after a long exposure, all panel technologies have weaknesses that can be revealed by stress test.
Some material or process used in manufacturing LCDs must be responsible for this, and although the problem wasn't unknown in the past (like a decade ago and even further back), it seems that there's been a resurgence in recent years.
I don't recommend people to avoid IPS completely, that'd be ridiculous, only do if you know you will have use for the OSSC's bob-deinterlacing mode a lot. Otherwise you don't have much to worry about.