I guess the whole bright corners phenomenon needs putting into context a little.
It would be better to refer to it as what it is - black field uniformity. They're not actually bright corners... (perhaps bright-er corners, or less dark corners...)
I have actually measured them. On my X7900 they are constant at 20,000:1 native contrast in the brighter areas - nothing I can do to the unit improves this (iris setting, etc). I'm sure if I click up my brightness they would disappear, but that would be pointless.
This means that the affected areas with reference SDR around 56nits are at something <0.003 nits.
Most non-dedicated rooms will have a black floor above this.
This means that these areas are still around 1.5 to 2 times darker than the best (without DI / DL) black level coming out of other manufacturer units in the centre of their screen! But they are eminently noticeable if you have a room capable of showing off these units to their best because of our log-scale vision and the rest of the contrast being massive on these units. I'm measuring about 65-70,000:1 in the dark areas on my X7900 at -9 iris - so the brighter areas are more than 3x brighter for my setup.
In use; they're obvious when I'm sat here consciously knowing they are there, and watching out for them. If I do let myself immerse in the content (recommended!
) then I do tend to stop noticing them for the most part
. The DI stops me seeing them almost completely, but has other issues I am still not sure I want to live with. I am going to stop thinking about them and just get on with watching movies.
is right - I'm not happy about the unit I have having them, because the last unit I had as far as I could see didn't have them. That to me says that unless there is something that happens to the units after manufacturing then JVC COULD TRY HARDER
. I was lucky not to pay for my own X7900 and they still annoy me, so I can feel the pain of folk who've bought their PJs. I would be very fussy in future about how I bought a PJ next time particularly as the opinion of amny seems that this isn't a fault - I'd probably look for someone prepared to work with me on the issue up-front so I didn't have to deal with JVC support. Or buy used / ex dem so I could see what I was getting before parting with my cash.