THX1138UK what you write about is looking like a BFI frame insertion option it TVs?
I don't know if you have read this but I dont like all those image processing stuff in TVs like BFI, ISF, local dimming (very annoying as subtitles on dark scenes are darker then on brighter ones), advanced backlight control etc etc. I always turn all this OFF because I like stable image.
and then this process you write about doesnt happen right?
My GZ950 OLED has Black Frame Insertion (BFI), which I disable, as the Display & Hold motion doesn't overly bother me and BFI has the negative effect of halving the brightness for HDR content. I have only seen BFI included on OLED panels, so double-refresh may well work differently on LCD/LED technology - I can't comment on it's effectiveness on LCD/LED TVs or what issues it may introduce as I have not seen it.
I have only seen double-refresh on an old Panasonic CRT displays (576i [PAL]) that I had before Plasma technology was widely available, and this did work very effectively at reducing flicker - but we were using true interlaced televisions then, and motion wasn't a problem.
Some people are more sensitive than others to 50 Hz flicker, and others are more sensitive to Display & Hold motion flaws.
We need AVForums and/or HDTVTest to get hold of one of these new Panasonic TVs to do a thorough in-depth technical review, to understand what these features are actually delivering regarding picture quality and motion.
We do already know that the peak brightness levels on the Panasonic LCD/LED TVs is relatively low, so they are never going to deliver spectacular HDR performance.
While agree that over aggressive picture processing is bad (frame interpolation etc.), certain features are options that let you get close to what the director intended as possible:
ISF (Image Science Foundation) is a picture mode that should be very close to Reference standards. It's really intended to be used when calibrating a TV, but it should be pretty close out of the box. It's
not a processing feature. Colour, brightness and contract should be much better than Standard/VIVID.
For most people, Local Dimming improves the image, by reducing the light behind dark areas of the screen to improve contrast. FALD (Full Array Local Dimming), is preferred, but sadly missing on the Panasonics. The more local dimming zones present, the better the level of control. If there are too few zones, than it will be ineffective.
Backlight needs to be a balanced so that overall image isn't too dark, but blooming is kept under control and not too distracting. The technology isn't perfect, it's a compromise.
Regards,
James.