Re: Pink sparklies and voltage - Panasonic P42UT30B
That pink diffusion just looks like dithering if it's moving around. When maldischarge due to low Vsus occurs then it tends to stick on the panel. Example:
https://www.youtube.com/watch?v=ROYHWY79784
You can see some of it in my video, in my case Vsus is far lower than it should be due to the bulb. But generally you get static pink patches and discharge issues as the picture brightens. Pink tends to be the first colour noticed because the green subpixels require a slightly higher activation energy to successfully discharge.
It might be that the TV is compensating for phosphor degradation and upping the gain on the green. To resolve this detail it will use a dither pattern across the panel. The plasma screen does not have a great deal of graduation steps (only ~1000 or so) without dithering, so it is a necessary feature. On most panels it is completely unnoticeable - I own several Panasonic PDP TVs and it is notable that Panasonic invested a lot of money into getting the dither patterns and algorithms right and that if you view the TV from its design distance of about 1.6m to 2m it is invisible. Note that beyond 1.6m the 1080p resolution of the panel is unresolvable to anyone with 20/20 vision.
If it's not visible from ordinary viewing distance I'd say it's not a fault and by design. The UT30B was Panasonic's entry-level 3D panel, so they had to make a few compromises which probably means it will dither more than a premium-line model like a GT or VT series. It was a first for the budget 3D plasmas (2011) and only a year after their high-end VT20 model which also supported 3D (& 1st proper commercially sold 3D TV, IIRC). Samsung had its entry out a couple of months later (D490) but by any account, having seen both panels, I would say that the Panasonic has it beat...and if you want to see dithering, you need only see a budget Samsung plasma panel. The black levels/graduations are almost entirely made up of dithered patterns!
That pink diffusion just looks like dithering if it's moving around. When maldischarge due to low Vsus occurs then it tends to stick on the panel. Example:
https://www.youtube.com/watch?v=ROYHWY79784
You can see some of it in my video, in my case Vsus is far lower than it should be due to the bulb. But generally you get static pink patches and discharge issues as the picture brightens. Pink tends to be the first colour noticed because the green subpixels require a slightly higher activation energy to successfully discharge.
It might be that the TV is compensating for phosphor degradation and upping the gain on the green. To resolve this detail it will use a dither pattern across the panel. The plasma screen does not have a great deal of graduation steps (only ~1000 or so) without dithering, so it is a necessary feature. On most panels it is completely unnoticeable - I own several Panasonic PDP TVs and it is notable that Panasonic invested a lot of money into getting the dither patterns and algorithms right and that if you view the TV from its design distance of about 1.6m to 2m it is invisible. Note that beyond 1.6m the 1080p resolution of the panel is unresolvable to anyone with 20/20 vision.
If it's not visible from ordinary viewing distance I'd say it's not a fault and by design. The UT30B was Panasonic's entry-level 3D panel, so they had to make a few compromises which probably means it will dither more than a premium-line model like a GT or VT series. It was a first for the budget 3D plasmas (2011) and only a year after their high-end VT20 model which also supported 3D (& 1st proper commercially sold 3D TV, IIRC). Samsung had its entry out a couple of months later (D490) but by any account, having seen both panels, I would say that the Panasonic has it beat...and if you want to see dithering, you need only see a budget Samsung plasma panel. The black levels/graduations are almost entirely made up of dithered patterns!
. That is from the same distance. However you will find that if you put up a standard test pattern of a checkerboard that the 4K and 1080p checkerboards will be roughly the same - they should appear grey at two metres. If you actually can see the difference then you are perhaps amongst a few percent of people that have better than 20/20 vision.
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