Big Ass Screen

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Revision as of 09:48, 25 October 2014 by 193.190.154.94 (Talk)
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Big Ass Screen
What:
Piet was so kind to donate a huge retro projection screen to the space. The original 3 lens beamer is a bit old and has burnt in areas. But all the rest is in working condition.

Rob's idea was to replace the old beamer with a new, LCD HiDef projector, and possibly add a touchsensor. The possible applications for 'Big Ass Screen' are left to the hackerspace visitors.

RetroPojectionScreen.jpeg
Participants:
T0rx, TomD, Kefcom
Category:
Electronics
Locations:
Den Bunker
Rob presenting C64 on the BAS

Big Ass Brainstorm :


Status

It was deemed that the original projection system was beyond repair, because the 3 color CRT's are burnt in too much. Feeding the projector with an inverted image mask, to correct the burnt in areas, would render the projected image even dimmer as it already is. The image quality would be better if the whole projector would be replaced by a more recent LCD projetor.

Approach 1

At the moment the BAS is gutted, internal electronics have been removed and the first tests to fit in an LCD projector are done. Unfortunately the projected image in the screen is too small.

To fit in the LCD projector, succesfully we can either widening the projection beam (by using a wide angle lens) or lengthening the projection path (by using extra mirrors) or a combination of both. For this to work we need:

Alas retro fitting the LCD projector might be too cumbersome. A new approach has been proposed.

Approach 2

Using an overhead projector and old LCD monitor. The LCD matrix (without the backlight) will form the image where usually the slides are placed on the overhead projector. For this approach to work we need:


after concideration it apeared to be better to go with approach 1. We have found a lens witch widens the beam of the projector and thuns creating a bigger image we still need a mirror to create a longer light path

we still need:

a mirror of at least 10cm square

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