Screen Gain - AVS Forum
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post #1 of 3 Old 11-13-2001, 11:41 PM - Thread Starter
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I have recently purchased a DLP projector with a listed contrast ratio of 700:1 and with 450 ANSI lumens. My HT room has white walls and ceilings (approximately 12’ x 15’) and the floor is medium brown in colour. I plan to have a moveable masking system in order to border the particular image size that I will be displaying (70†x 40†for 16:9 and 64†x 48†for 4:3). I will have complete light control, but, I will require some directional lighting at the seating area (approximately 12’ from the screen).

I have viewed this projector on a 1.3 gain screen but in a non reflective dark surfaced room. Could anyone suggest a screen gain that would accommodate my parameters? With a higher gain screen (greater than 1.3), would I be bothered with light reflections on the screen due to the white walls?

Peter
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post #2 of 3 Old 11-16-2001, 09:08 AM
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The smaller size screen will really help keep up the percieved contrast ratio. Higher contrast ratios with Digital (lamp) projectors are only achieved on the smaller screens. This is because the contrast ratio is affected by reflected light, and amount of light shone on a given sq. ft. of screen.

The higher the light ouptut on a given sq. ft. of screen (smaller will achieve this), the higher the contrast ratio. So, guys want the advertized spec of a given PJ, but they want it on humugous screens.

Not possible. It CAN be gotten closer to, by getting the right grey level and reflective gain characteristic in the screen design, but it will vary with -each- screen size chosen, even with one individual PJ model.

Ken Hotte

"Never forget that only dead fish swim with the stream." -- Malcolm Muggeridge.
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post #3 of 3 Old 11-16-2001, 09:26 PM - Thread Starter
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Ken, thank you for the information.

Peter
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