Tech

Projector Wrap Calculation

The Protege/Innocademy team mapped (taped) out the floor for the rooms and measured (calculated - see below) for projector/screen location and size using the room layout your team provided. It seems the best throw distance using the Viewsonic projector PJD8633WS seems to fall between 4' 2" to 4' 10" from the screen. We came up with this size as the best because we wanted to cover the height of the room at a minimum of 7' ceiling height using 16:10 aspect ratio. However, this comes with some caveats. I also attached to this email and posted to our shared Google Drive additional photos of the space and our prototype dashboard for the console. Please give us feedback. Thanks Bill!

The throw distance depends on how high you want the image to cover the walls. If you want a wall that is 7' tall (84") then you would place the project 4' 2" from the screen which renders an image 134" W x 84" H. If we wanted 8' tall imaged walls we would need to move the projectors back to 4' 10" location. This location would produce an image that is 153" (12' 9") wide. As you can see the width of the image may not be a concern but the height you want to project will have a determining effect of the throw distance. We calculated additional throw distances going from 2' all the way to the 4' 10" distance and put these measurements below.

Having to move the projectors back ~4' from the screen could cause shadows to occur (actors in front of screen) even if we concaved the screens in the corners and used the walls in a 10' x 10' space. We thought a possible solution could be to 'rear' project the image onto the walls. This too has its issues (like, projecting on one wall at a time or additional space for back of wall) but could solve the issue with shadowing.

Ultimately we determined that the screen location as shown on the room layout would need to be adjusted from straight diagonal placement to smaller concave corner screen coverings if we wanted to have enough space for 4 students to wander in a room and without screen shadowing. We determined that having two screens in these placements areas would certainly take up too much space. If we used 2' corner concave screen coverings and used the walls for the screen at the 7' H the two projectors would give us over 22' of video wall. This would cover the back wall and nearly half of the two side walls. The downside would be placement of the projectors from the wall at 4' 2".

Finally, the location of both projects using the concave corner screens ~4" from corner puts the projectors 54" out from each corner (from lens) on a diagonal line.

Calculated Screen Sizes using Throw Distance of Projector at 16:10 Aspect Ratio

2' throw distance = 65" W x 41" H

2' 6" throw = 80" W x 50" H

3' throw = 97" W x 61" H

3' 6" throw = 113" W x 71" H

4' throw = 129" W x 81" H

4' 2" throw = 134" W x 84" H (ceiling at 7')

4' 6" throw = 144" W x 90" H

4' 10" throw = 153" W x 96" H (ceiling at 8')

• Calculated Screen Sizes using Throw Distance of Projector at 16:9 Aspect Ratio
• 2' throw distance = 65" W x 37" H (loose 4" in height compared to 16:10 ratio)
• Calculated Screen Sizes using Throw Distance of Projector at 4:3 Aspect Ratio
• 2' throw distance = 54" W x 41" H (loose 11" in width but is same in Width to 16:10)

Projector Specs:

High-ish End: PJD8633ws from ViewSonic

Viewsonic Projector

Specs (full specs are in the link above):

• WXGA 1280x800, DLP, 3000 lumens, 15,000:1 contrast ratio
• Ultra short throw – 81” image from 2.1 feet (throw ratio 0.375)
• Throw Dist (feet): 1.8 - 4.8Image Size(inches): 70.0 - 180.0
• Throw Ratio(D:W): 0.38:1
• LAN control, wired & wireless LAN display, USB display, PC-less presentations
• Resolution: WXGA 1200x800 (native)
• Throw Ratio: 0.375:1
• Aspect Ratio: 16:10 (native)
• Compatible with PC and Mac