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Join Date: Apr 2000
Location: The Wilds Of Canada
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Well. You would think that it would encompass exactly that of the distance of the projector to the screen center. Which on average, would make the sphere bigger than the room.
There are ohther considerations when using CRT's though. You have to deal with the 'lens spread' and extrapolate how that woulld effect the curvature at the screen for a perfect focus. And design into the curvature a method of correcting it.
The adven tof single lens systems makes the discussion of such design considerations moot. There have to be considerations in looking at what happens when you take a lensing system that is designed to deal with a flat screen, and transpose that to a proper screen.
If they gave me aprojection system that worked as well as a CRT, then I wouldn't even go through the headache of dealing with the modifications to the curvature. The digital single lens systems, as i said, take almost all of the trouble out of such screens, as a design problem.
My comments as to differences within the curvature, and not exceeding, etc. apply only to the CRT desires within me. Perfect parabola, or surface sectioning is what will be needed with the DLP, DILA, and LCD screen.
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"Never forget that only dead fish swim with the stream." -- Malcolm Muggeridge.