Originally Posted by Wesley Hester
The lack of a dynamic iris is a major reason. With DLP, I've found that alot of light easily reaches the screen from pixels that should be off and very dark instead. The "darkness floor", if you will, is very high up there into the dark grays. The CRT RPTV I gave my brother puts every DLP I've seen to shame in this department (black is black on it).
I'm not sure if I agree entirely with this statement. I spent 7 years calibrating CRT/RPTV displays before getting my hands on a DLP display. While there's no question that the initial models didn't compare in black level to the best CRT models - the newer ones get a lot closer. Plus, their grayscales are MUCH more neutral particularly at the lower amplitude fields than the vast majority of CRT/RPTVs. So while the "blacks" may actually be a gray/black, at least they're not blue/black, red/black. or green/black which is the case on many CRT/RPTVs.
That said, the 5679 is also hindered in this regard by its gray cabinet.
Texas Instruments' "Dark" tech reduces the amount of reflected light of "off" mirrors but it isn't close enough by a long shot to me. A DLP breakthrough that produces a completely black/off pixel when it should be (mirror in the "off" poisition, will be a big one. Until then dynamic iris and the resulting marking names for it will be needed.
In theory, this would be a good solution. However, I have never seen a dynamic iris that didn't negatively impact other areas of the picture.