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Author Topic: Rear projector screen  (Read 16546 times)

Offline davidjmortimer

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on: July 30, 2009, 03:46:59 AM
I found this link to instructions on making a rear projection screen for classroom use.

http://www.instructables.com/id/Rear-Projection-Wiimote-IWB-Interactive-White-Boa/

Has anyone tried this and succeeded? What material did you use?

Tell all please?

Cheers
DJM


Offline benpaddlejones

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Reply #1 on: July 30, 2009, 06:44:16 AM
DJM
Yes I did this with an old mobile whiteboard (the ones that flip). I secured the frame then used 3mm lighly smoked perspex. Worked a treat.

Make sure your project has rear projection mode so the image is flipped. Then go a a sign shop or perspex & glass shop. Take your project and find which material works best. The guys running the shop were so fasinated with what I was doing they were pulling differnet materials out left right and centre.

joestewart also told me cheap disposible plastic table cloths also work a treat. Could be a good place to start.

benpaddlejones :-)


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Offline jdkestewart

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Reply #2 on: July 30, 2009, 07:47:52 AM
Hi,
Here's a screen made from the cheap disposable table cloths. They are white and $2 each. I used 3 for the play. You can buy them from the "cheap" warehouse stores. They were taped and hung from the rafters of the room. and were taped to a wooden beam which lay on the floor. The data projector was placed about 3 meters behind this screen and provided all the backdrops and scenes for the play which was a humourous version of Cinderella. In the dark, it gave a huge, very clear image. Over 3 metres wide by 2 metres high. The best part, no shadow was being cast on the image. The children performed in front of this. Looked very impressive. You do need to flip / mirror the image on the data projector settings so that text is able to be read. You wouldn't want it this big for normal classroom use though.

If one tablecloth was stretched across a light wooden frame it should work. As I took this photo before the concept of the wiimote (back in 2006) I haven't tested if the IR Pen can be detected through the plastic. If not, the wiimote would need to be placed behind or to the side of the user.

Good luck,
 Joe.


Offline davidjmortimer

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Reply #3 on: July 31, 2009, 12:43:13 AM
Thanks Guys,

Any ideas on how to get rear projection mode? Can this be done with software?

Cheers
DJM

Nevermind - I've just worked out it is a projector function
« Last Edit: July 31, 2009, 11:55:34 PM by davidjmortimer »


Offline bbzs

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Reply #4 on: July 31, 2009, 04:36:19 AM
   
I'm using the rear projection of the room features table. Traditional chalk board behind the projector from the rear window. Thus, the two tables in turn use the teaching period.

http://www.youtube.com/watch?v=LH99hoaqtsg


Offline tebteach

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Reply #5 on: August 15, 2009, 12:12:46 PM
The rear-projection instructable is my project. I made the frame from lumber from a home supply store. And I purchased the rear projection screen material from rose brand, it is grey in color, the link is on the instructable. I tried using the table cloth or shower curtain method and the had terrible Hot-spotting in the middle of the screen.

If you have any specific questions let me know.


Offline benpaddlejones

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Reply #6 on: August 15, 2009, 09:32:33 PM
tebteach
The instructable is some great work :-)

benpaddlejones :)


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Offline davidjmortimer

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Reply #7 on: August 19, 2009, 05:12:51 AM
tebteach,

I echo Ben's comments, the instructable is very interesting, I am interested in persuing somthing with a hard surface though. Have you tried using perspex sheets? I have seen some discussion of this being used in some dj/vj forums...

Cheers
DJM


Offline citysurf

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Reply #8 on: September 21, 2010, 07:21:36 AM
Hi,

I just koined the forum. It is a fantastic technology which can be applied to many industries.

It is perfect to see system work with rear projection. I have a very important question.

Lets say we put the projection film onto the 20mm thick shop window.

Will that still work?
Has anyone tried this?

Before, start setting up a system it will be good to know.

Thanks.


Offline boonjin

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Reply #9 on: September 21, 2010, 09:30:47 AM
Hi,

If the IR can be transmitted through the thick window, it should work.

You may want to try out with an IR pen and your handphone camera.

A potential issue may be stray IR sources detected from sun light.

Regards,
Boon Jin

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Offline citysurf

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Reply #10 on: September 21, 2010, 10:48:15 AM
Hi,

Thank you very much for your help.

It is good to hear that, as soon as I try in a few days, I will let you know.

Whole idea is using the application from outside of shop window, which is really exciting.
Hopefully, sun light will not be an issue, since rear projection will be used for the system.

Cheers


Offline boonjin

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Reply #11 on: September 21, 2010, 06:55:59 PM
Hi,

If the Wiimote is facing out from the shop towards the window, there may be sun light detected.

All the best in your experiment. :)

Regards,
Boon Jin

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Smoothboard for Mac
Using a Mac? Now you can annotate on PowerPoint or Keynote slideshows!

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Offline Ulfilas

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Reply #12 on: October 08, 2010, 06:56:50 AM
the guys over at friispray.co.uk have used it on a shop window at night.


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