Vertical Masking Improvement for Home Depot DIY Screen - AVS Forum | Home Theater Discussions And Reviews
Baselworld is only a few weeks away. Getting the latest news is easy, Click Here for info on how to join the Watchuseek.com newsletter list. Follow our team for updates featuring event coverage, new product unveilings, watch industry news & more!


Forum Jump: 
 
Thread Tools
post #1 of 2 Old 10-19-2001, 05:27 PM - Thread Starter
Newbie
 
Rolan's Avatar
 
Join Date: Oct 2001
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
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)

~ rolan@omnistep.com
Rolan is offline  
Sponsored Links
Advertisement
 
post #2 of 2 Old 10-20-2001, 08:59 PM
Member
 
sonogr4's Avatar
 
Join Date: Feb 2001
Location: Iowa City, Ia
Posts: 51
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Nice Photo's. Pictures always make for easier explanation. Thanks for posting them.

Todd
---------------------
-scan-lines-annoy-me-
---------------------
sonogr4 is offline  
Sponsored Links
Advertisement
 
Closed Thread Screens

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off