underage wrote:
Indeed, but I think they can only insert a full black frame at 60hz, not at 120hz.
You should be able to easily check that with your own unit. Do 120fps seem noticeably brighter at the 'high' setting compared to 60fps/high? (Ideally comparing the same content)
The older 60Hz panels were actually also able to insert a full black frame as well, they in fact do the same thing that the newer 120Hz panels do when the BFI/Motion Pro setting is set to high and the signal is 60fps, that is "single strobe" or flicker at 60hz, which means that each frame of the 60fps content is shown for half the time that it normally would, while the other half is occupied by a full black frame. The same goes for 120fps content @ 120hz, except each time interval is obviously shorter by half. Doubling the frames and blacking out each one for 60fps content would lead to the exact same result in terms of motion blur improvement. EDIT: actually not sure about the exact duration of the full black frame, on LG panels it may in fact be
longer than the actual picture frame being displayed, which would explain why the dimming is so significant and visually more than 50%.
This means that as far as 60fps content is concerned, all LG OLED panels, older 60Hz ones and newer 120Hz, will perform exactly the same with BFI set at max (which was the only setting for older models). The advantage of the 120Hz panels is only for 120fps content, which can benefit much more from the max BFI setting @ 120Hz.
It is also correct that at lower settings the BFI becomes a "localized BFI" in that a smaller portion than a full frame is displayed, except it is always at a 120Hz cycle which is beneficial for 120fps in the motion clarity vs brightness loss tradeoff, but not for 60fps content (or ~30fps), which is what we care about for retro stuff + OSSC. This is where a rolling scan/bar @ 60Hz as discussed in the RetroArch article I linked earlier would be a significant improvement.
This discussion now may be getting a bit too tangential, but I still think it fits since a lot of OSSC users will look at commercial OLEDs to pair with them. It should be clear by now that it's completely inaccurate to say that there is "no blur" with any of these LG OLED setups, since even CRT itself has some persistence blur albeit very minimal at 1ms. There's also room to discuss how to compensate for brightness loss from BFI + scanlines, for an SDR signal like that of the OSSC an LCD panel may actually be a preferable choice.