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Discussion Starter · #1 ·
I've been using a white pulldown rolling blind from Home Depot

as a screen for my Infocus 340 projector - and it has been

working quite well. The screen is barely noticable when

completely rolled up out of view (thus achieving a high

WAF*)


Light leakage from the DLP chip and reflections from the

floor and walls added to a reduction in contrast + black

levels - so I decided to try my hand at masking the screen.


I was surprised at the image improvement and quality..


Check out http://omnistep.com/~rolan/ht/


for my design.


When switching from 4:3 to 16:9 mode using the Infocus projector, the width remains the same and the vertical is compressed. (that is - the top and bottom 2/9'ths of the DLP chip are not used)


Seeing that the width of the screen did not change enabled me to permanently affix the left and right masks to the rolling blind material. The bottom mask was also double-side taped

permanently because the height could be varied by rolling

the blind higher or lower.


That leaves adjusting the top blind height - which is done

with black cloth and a separate roller unit.


So in summary, the actual screen has a U shaped mask permanently affixed, and the top mask is a separate adjustable blind which rolls up and down to the desired level.


With this setup, I am able to adjust the vertical masks to any

dimension necessary - thus acheiving a tighter border around the screen than those with fixed 16:9 screens (I did notice

that on some DVD's like Blade Runner, the wide format is more like 16.25:9 leaving black bands above and below on a fixed screen)


Just thought I'd share the design with all of you.


BTW, I found the front side of the blind to be too glossy.

The matte back side seemed better, so I pulled the screen off the spool and rolled it on - in reverse.


One more tip:

http://omnistep.com/~rolan/ht/?slide=8


though not done very professionally in the photo, a piece of cardboard with a rectangle cut out and placed in front of the lens reduces most of the light leakage from the projector (which contributed to large arcs of light to the top left of the screen)


~ [email protected]
 

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Nice Photo's. Pictures always make for easier explanation. Thanks for posting them.
 
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