DIY Video Projector

[dwalls32]

Zark, what's wrong with the lcd panel you have?

[xmoger]

A few years ago, I was fascinated by a substance called aerogels. For those of you who don't know what it is, it is a silica based solid that also happens to be the lightest known to man, as well as an excellent insulator. Original experiments produced very brittle samples, but recently the production has been improved. Mountain coats with this stuff have been made that can tolerate temps from -50 to 5000 degrees F. Unfortunately the material still has a blue hue to it, but production in a microgravity environment may soon alleviate that.

I was thinking that maybe a thin sheet of this material could be used around a condensor and protect it and the LCD. Hopefully we could get sheets that pass most of the light and color adjustments could be made for the video to compensate for the blue light tint.

A quick search yielded these

Here's a place that sells 5x5cm 'high quality' samples for $47 shipping
http://www.airglass.se/sale.html
Samples for $15
http://www.cae.wisc.edu/~aerogel/aboutaerogel.html

[Tim]

Fender4

Very interesting reading http://www.reefcentral.net/vbulletin...threadid=48133
It might be worth looking into. Maybe the fluorex could be overdriven?

Thanx

[fender4]

zark,

So the LOA light is basically a very bright backlight for the LCD that does not require a fresnel? That's the approach I would like to take. I know those lights are very bright and efficient.

LOA light ------>LCD------->Delta lens assembly

This might be grossly oversimplified, but is this what you had success with? Sorry to hear about the broken ribbon on the LCD. What LCD's are you looking at to replace that one?

xmoger,

Those aerogels are cool. That second link gives a great description. It's worth keeping an eye on that, especially if they can make it clear instead of blue. I'm not sure if it would filter IR radiation, but it sounds like it would insulate the LCD from the heat generated by the bulb/ballast.

Tim,

I like the overdriven fluorescent idea too. I might try it on my aquarium lighting if I get a chance. I haven't seen any specific data on the ballast or the bulb of the LOA light, but I don't see why this couldn't be applied to it...with the trade-off of decreased life and increased heat, of course. It at least gives us an interesting option.

-f4

[dwalls32]

Here is just link to an article talking about multimedia lcd panels. At the end the name a few specific ones good for video, some of which are available on EBay right now.
http://wings.buffalo.edu/publication...n1/watch1.html

[Type-E]

Originally posted by PTremb
here you go type-e delta II lens 3 for 30$ on buy now http://cgi.ebay.com/aw-cgi/eBayISAPI...tem=1316945272

I only need one

[jord4231]

Heya all ive built my own lcd projector and it worked great im using a 500watt 240v globe 9000 lumans and just mountid it on the roof i have picturs of it so if you want any i dears just email me jord4231@hotmail.com It is posible to build ur own projector you just need lots of pasients

[Schaef]

I was surfing through an electronics website the other day and came across the following site and thought you guys might be interested in it:

http://www.earthlcd.com/

They offer a wide variety of LCD sources and conversion hardware for NTSC to LCD! Check them out and see what you think.

[Grumpy_Git]

Firstly I'm not being a kill joy here but (in my experience which I must say is limited.) using strobing and flash sources for these projectors just isn't going to be feasable as it is necessary to synchronise the flashes (which are at 50/60hz) to the switching of the LCD display so that waht you get isn't a half drawn or blank screen.
An alternative to this would be to strobe at a multiple of the refresh rate. eg. 100 hz or 150hz for 50Hz video, as this would no longer require the synchronisation of video and light sources.

On a seperate note, I've been hearing rumours of car companies using LED banks of around 100 individual units to replace headlamps in some top of the range cars ( the story I heard was Mercedes-Benz taking this approach) in this case, a very bright and a reasonably wide beamed source would be necessary to provide the spread for covering the space in front of a car. If this is true, either finding these units as replacements or finding the brand of LED to use would be useful.

Thats all for now, keep up the good work everyone.

Nick.

[zark]

Thats pretty much the way my projector is setup. It is a little tricky getting the LCD panel mounted in front of the Delta lens correctly though. I'll try to make some pics of the panel mount I made.

The LCD I'm using is a 5" from Parts-Express. ($120)

My idea was to make a descent NTSC projector for under $200.