Microperf screens and DLP projectors - AVS Forum
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post #1 of 8 Old 11-07-2001, 06:05 AM - Thread Starter
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Are moire artifacts a problem when combining a DLP projector with a Stewart microperf screen? The screen size I am considering is 54" x 100".
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post #2 of 8 Old 11-07-2001, 06:25 AM
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Generally the problem is with a few LCD models. Stewart would have a list of projectors with known problems.

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post #3 of 8 Old 11-07-2001, 07:06 AM - Thread Starter
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Don, maybe you could pipe in here. I would be interested in your experience with dual mode DLPs such as the Sim HT200DM and the new 720x1280 DLPs such as the Sharp.
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post #4 of 8 Old 11-07-2001, 10:39 AM
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I saw ripples (looked like ripples in a pond after a rock was thrown in) when watching a Sharp 9000 DLP on a Draper perforated screen. The ripples were definitely caused by pixel/perforation interaction.

However, Stewart's microperf screens may have smaller holes than the Draper.
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post #5 of 8 Old 11-07-2001, 11:17 AM
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Gentlemen,
To date we have not had any problems with moire artifacts and DLP projectors. We have had problems with certain LCD projectors. The majority
of the LCD moire problems have been with the native 16 by 9 LCD PJ's. The Sharp 9000 will be the first native 16 by 9 DLP that we will test with a perforated screen. I do not anticipate any DLP/ moire problems with the new 16 by 9 chip but, I will feel more lot comfortable after actual testing.
Regards,
Don

PS: As I am writing this thread the Sharp just arrived into my office, Stay tuned.
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post #6 of 8 Old 11-07-2001, 04:19 PM
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Scott,
We did test the Sharp today with the new 16 by 9 chip on a Microperf screen. We displayed a solid white field image on the screen during the test.
We did experience slight moire on screen images when less than 88 inches wide. As pixels get larger in relationship to the constant perforation pattern
the moire artifact is not an issue. (In this case the hard line is right at 88 inches)
Quick Summary: I would not recommend Microperf on screens less than 88 inches wide with this particular chip. If the screen exceeds 88 inches in width, then moire artifacts will not be an issue.
Regards,
Don
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post #7 of 8 Old 11-08-2001, 12:13 PM - Thread Starter
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Don, based upon your previous two posts is it fair to say that I would not experience any moire artifacts with a Sim HT200DM or a Sharp 9000 on a 96" wide microperf screen? How do you test for moire artifacts? Are there a number of individuals who look for it?
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post #8 of 8 Old 11-08-2001, 01:11 PM
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With a 96 inch screen width you will not have any problem with the Sim 2 or the Sharp.
Testing for moire is a very simple visual test We project a full white field at different image sizes. (Pure white light will show the sins of any projection surface) The moire, similar to a zebra stripe pattern, is very easy to witness under such circumstances.
Regards,
Don
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