posted 12-07-2011 04:57 AM                    

quote: Mark Uhde

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Carsten, both SXRD and DLP exceed the contrast ratio of movie film. That's one of the things I LOVE about D-Cinema, better contrast.

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posted 12-21-2011 03:51 PM                    

quote: Mark Uhde

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Second, as to the green panels failing first (so they're failing to a purple color?), Sony has to be doing something really, seriously wrong in their design. Blue light contains the most energy in the visible spectrum. Thus, it destroys the blue panel first. I can't imagine what Sony could be doing WRONG with their green panels that they'd fail first despite simple physics demonstrating the blue should die first.

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The only energy that blue light might contain is some enrgy is UV that has not been filtered out enough. The color split is actually this and although these figures may not be 100% correct they are very very close. Green 56%, Red 28% Blue 16%. All of this color percentage today is still based on the original color tv studies of the 1940's and the division of the colors is purely based on the color sensitivity of the human eye... nothing more, nothing less. In Sony and DLP this is based on green, blue, and red wratten filters that are cemented to the prism to filter the light. In DLP is is filtered before the light hits the DMD.

This is why the green panels fail first, they are doing all the work. When your local Sony fails you will know it as the image will develop first a yellowish brown cast to it and then become very brown if it is not tended to soon.

The best way to see this color division is to look at the individual Green, blue, and red color test patterns that are available on any decent DLP projector. It will become immediately obvious to you that as you go from green to red to blue they become progressively harder to see. In the old NTSC color days the blue channel in any given TV camera was ALWAYS noiseier then red or green. Usually a specially selected "Blue Tube" which had a specially treated target was used in that channel in attempt ot gain a littloe more sensitivity and generate less noise. Blue channels even in modern HDTV CCD cameras are still exttremely difficult to align properly because of the lack of output.

White light through a prism. Blue DMD at the bottom red DMD at the top and green DMD at the left. Blue is so weak as to be over powered by green. Some red is visible at the top...

posted 01-15-2012 05:06 PM                    

quote: Mark J. Marshall

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That's a great article, Jeff. Thanks for posting that. I can't help but think that the problems the article refers to and the issue I noticed in the theater are very similar if not the exact same problem.

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