Originally Posted by Wookii
You have to realise that this is physically impossible. A screen material cannot selectively change its gain based on the intensity of light being reflected off it. It can't have, say, a gain of 0.5 at 5 IRE and a gain of 1.8 at 100 IRE - it will reflect exactly the same proportion of light at all intensities. So there is no way it can physically increase the on/off contrast.
It would be a nice thought if it could break those laws of physics, it would solve dynamic range issues with projectors in one fell swoop, and we could all enjoy 1mil:1 on/off contrast.
The only way your screen could increase perceived contrast, is as Bobof has described, in that it has ALR properties, and you have a reflective room, and it is preventing light reflected back onto the screen from being projected back to the viewing position. Even then though, thats only going to improve your intra-scene ANSI type contrast, not on/off contrast so it won't improve the black floor in low APL scenes with no bright highlights, which is where high on/off contrast becomes most critical.
But prob a bit of everything... I don't know what's happening but anyone can go try... I already showed you the picture.. the blacks are certainly lowered by many degrees till they look like the blackest projector i have ever seen personally (JVC included).
1. APL Scenes - looks agreat! I watched Godzilla, the torture test on this. As I said, other than lowering the black floor, any sort of light is still there.. nothing looks washed out.. it just seems to bring the black floor down... so, in very low light scenes, things still looks great and contrasty... In space star field scenes especially. You can see tiny bright stars while everything else was inky black.
2. I have no clue what the 'physical gain' or none or whatever, but I can only tell you what i observed. The blacks became much blacker (let's say on off), and then the lighted scenes became much brighter (as this is a higher gain screen), so, no they are not both elevated at the same time...
3. ALR properties. Perhaps... but as i said, i have already tried covering the room with black velvet and the perceived 'black floor gain' or ansi contrast as you call it, didn't improve by much on a white screen. Nothing as drastic as this screen alone. So, can I squeeze out extra ansi, sure.. but not that much...
4. I have also compared the 'white screen material' both my woven screen and a 1.0 gain vinyl solid screen and a 1.6 gain white material side by side on this screen. And all of those screens elevated the blacks by a lot.. (I take it those are the native black level of the Sony).
Anyways, all of that technical stuff may be right (or wrong), but it doesn't change the fact that this screen could lower the black floor of the DLP projector as well.. that's what's we're all talking about here...