Computer to overhead projector adapter

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performaman's picture
Joined: Dec 20 2003
Posts: 209

I know that about 10 years ago, there were these things that were esentially an LCD screen that was placed over an overhead projector and connected to a computer's video out port. These allowed images from the computer to be projected. Now, I have googled around a bit, but have not found any information on them. I know that one can be easily built from a LCD screen, but I do not want to use an expensive LCD monitor for this. The only thing I can think of doing now is taking an old laptop and running it as an X11 terminal to connect to my laptop when I've booted into Debian.


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Joined: Sep 16 2004
Posts: 274
hrm...i actually have one of

hrm...i actually have one of these things
still in the box
its only 8 color and connects with composite video or cga
it was manufactured by infocus
i looked on ebay and found one similar to mine

-Wallstreet-'s picture
Joined: Dec 26 2003
Posts: 148
I've got one, mine's made by

I've got one, mine's made by N-View and is a 9" 24-bit color LCD that does 640x480. Making your own isn't as easy as meets the eye. First of all, you need to remove the backlight. Not too hard. But, you also can't just lay the remaining LCD panel on an overhead and call it a day. You need to build a case to raise it above the glass surface of the overhead, but not too far or it'll be out of focus. The reason for this is that you need a ton of cooling. Probably more that you're going to be able to get. If I were going to make one, I'd put two fans on the front and two on the back, with one end blowing air in and the other end sucking it out. And these fans need to be moving FAST. Amd evem then, you're still probably not going to be able to keep it cooled well enough and the pixels will all just start turning black. Secondly, you need special tinted glass on both sides (you might be able to get away with just putting in on the top side) of the LCD. If you don't do this, none of your colors will look right. For example, white will look yellow, like the light bulb, and black will look blue, and all of your colors will be washed out and all that good stuff.

My advice to you is to head to eBay and buy one. I've seen them go for under $150 for a 9" with VGA (640x480), SVideo and Composite.


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Dr. Webster's picture
Joined: Dec 19 2003
Posts: 1687
I've got a Panasonic model th

I've got a Panasonic model that'll do 640x480 at 24-bit color (IIRC) with VGA, composite and S-Video inputs. Includes power adapter and wireless remote. I was thinking of putting it up on eBay; I've seen similar models go for over $100. If you're interested, PM me.


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visorboy333's picture
Joined: Dec 20 2003
Posts: 35
i also have one. Mine's an nV

i also have one. Mine's an nView TFT that does 640x480 i've used it for countless presentations for school since most of my teachers have an overhead in their room