Originally Posted by Playdrv4me
I see where the confusion is coming from. Pioneer touted "one sheet of glass" as a feature on their OWN page years ago. In fact, they even talk about their own form of glass bonding. If they say one sheet, I say one sheet and the benefit ultimately touted is the same."Most plasma screens employ two front sheets of glass, creating secondary reflections at some viewing angels. Pioneer developed a patented color filter which is bonded directly to the first surface glass, allowing this display to use just one sheet of glass. The result is superior contrast even in brighter environments."
In my opinion we're skewing far afield into the world of semantics at this point. If "one sheet" results in the "ultimate picture quality", then the Pioneer was clearly already there with one sheet, just sunken beneath the bezel. The Panasonic is one flush sheet. In my opinion the Panasonic's *flush* sheet of glass design creates an illusion that produces more pop to the image and almost makes the image appear to "float" in mid-air. When combined with the ultra thin bezel and the Panasonic's superior employment of anti-glare technologies, perhaps there is a more enjoyable picture in some cases (it does to me). But did they "create" better PQ through AGL in an attempt to make it one sheet? Not really, they just ADDED a piece of glass and then made it look nicer through AGL.
AGL bonds that EXTRA sheet to the PDP to make it seem like the PDP becomes a single pane across the front of the TV. It has no technical benefit, but creates an *illusion* that does have a benefit for those of us who like the look it achieves. The irony of all that is that the VT would seem to be the only TV at a (minor) disadvantage here as one of the few, or perhaps the only high end PDP that even has an extra sheet WITH an air gap this year.
NOW... As for that light filter... I thought the VT60 and F8500 both had this? I thought this was the aspect that causes the dimming effect when you get off the "sweet spot" and end up over or under a certain angle on the display. I know for sure the F8500 does this, I don't actually remember if the VT does or not. *If* in-fact the F8500 and VT also have the light filter, then it ultimately means that the only thing AGL ultimately achieves, is making the image flush with the frame. And that's not to diminish AGL's importance, but to narrow down exactly what the benefit is in answering David's original observation, i.e...
1. Pioneer is also one sheet of glass, with NO filter (only a coating), but sunken within the bezel.
2. VT60 has the light filter (?) and A/R coating, but has to make due with an air gap to achieve a "one sheet look". Extra layer of glass works against you here in terms of ultimate PQ.
3. F8500 is one sheet sunken within the bezel like Pioneer, AND has its own implementation of the same type of light filter.
4. ST60 is most like the Pioneer. With an Anti-glare coating, and what appears to be a single sheet of glass design sunken within a bezel. On a side-note, the more I examine the differences between all these TVs, the more the ST60 really stands out as a spectacular value of the year. I probably would have chosen this over a VT had I not been dead set on a ZT.
5. I remembered that I noticed a halo effect on LGs. I just realized that this is because they use older dual pane designs (likely what Pioneer was referring to in *their* press release) and worse yet, employ NO A/R coating to combat external light sources. This is really the worst of all possible scenarios, and you get what you pay for there.
6. Finally, ZT60 has the light filter, has the A/R coating, and by way of AGL *extends* the benefit of one-sheet of glass design to a completely flush appearance.