Originally Posted by Geof
The patents I read pertained just to the LCOS chip and did not discuss ANSI. Like everyone else I wish ANSI were better but I have no knowledge as to what is limiting it (although it would not surprise me if the wire grid polarizer, which is heavily responsible for the huge on/off, is a primary culprit limiting ANSI).
I was thinking about this. Is the wire grid responsible for light leakage to adjacent pixels? It may introduce scatter which would also affect ANSI. But we know that when you illuminate a single pixel at full white on an otherwise totally black screen, that the neighbouring pixels are also partly illuminated. As you increase the area of white pixels, more and more surrounding pixels start to illuminate. This is how the limited ANSI is manifested, but is the cause simply native to LCoS characteristics? THe interesting thing is I might have expected this years models to have worse ANSI as the pixel fill is reduced thus I would have thought increasing the risk of neighbouring pixel illumination. So far tests suggest it is the same. The only projector with LCoS panels that I recall having better ANSI was the Sony VW1000 uber expensive HD chip. Is that because the chip is bigger and the pixel size is smaller, or did they do something else to achieve 600:1 ANSI? Whatever though, we are still dealing with numbers like 400, or 600 rather than thousands like plasmas can achieve.
To understand more about ANSI though, people should understand that an ANSI test pattern is a bad (not worst, but bad) case scenario. If you have one white pixel in the bottom right of the screen and black elsewhere, you will be able to measure parts of the screen that achieve the full on/off native capability of the projector. As more and more of the screen is occupied with illuminated pixels, we start to move from the max on/off towards the ANSI number. Thus the limited ANSI contrast comes more into play with brighter scenes than darker ones. Time and time again Sony's are reviewed as having more "pop" in bright scenes when compared to the JVC. If limited ANSI differential is not the case between the cheaper Sony's and JVC's, then I am curious what factor is giving that impression considering that the native contrast of Sony's are also lower.Edited by JonStatt - 1/9/14 at 2:04am