DIY Video Projector

[zark]

Do you have any pics of your projector yet?

[Bitch]

Okay I made a "3d" design for my furniture setup since I have nothing much else to do for my project so check it out if intrested.. Remember to click it after the page fully loaded to see what's inside. When looking at just tells me to get some old shelf and put the stuff in

[Tim]

Hello all, I was wondering if any one has seen this?
The effect is that when I have the contrast turned up all the way (which is very good) I can get an even sharper projected image by tilting the display (top back) by about 20 degrees. The problem then arises of the keystone effect. I also lose some of the brightness in the projected image, But the image does improve a great deal.

BTW Myren. The tin foil is best put to use as a reflector in the back of the LOA housing, I just taped a section of foil to the existing white reflector, it made a marked improvement in the brightness of the image. I do think in the end it will take atleast two LOA lights and a good mirror to get the amount of light needed.

LOA light
One problem I originally had with the LOA light was hot spots on the tube when the contrast was turned up. This can be overcome by placing a mask
of opaque scotch tape directly to the glass on the light side of the LCD panel. Place the tape only in the areas of the hotspots (vertical or horizontal) lines of the fluorex tube. I also tried to place a frosted glass between the Light and the screen, but that appeared to dim the whole image.
Web site updated again more pics shortly
<a href="http://bstv.timlewellyn.com/" target="_blank">bstv.timlewellyn.com/</a>

[lokost]

Bitch

Why do you have the big glass front?

I am planning on making mine look like a giraffe or maybe an elephant. If I get help with off-axis projection I will make it look like the sphinx - sitting on my carpet ahead of the viewers.

[Fiat1]

I am building a coffee table to house my video projector, keeps it out of the way and looks liek you don't have a video projector, will have to be a little bit higher then a normal coffee table. Good work everyone, everything is coming along well, now everyone is building something after so much working out! I am going to stop using my OHP and make my coffee table projector as well as using the fresnel lens. Someone posted about some OHP for like $130 use, why not buy that and use the fresnel lens and rip the other lens out and use them, although it would have to be long becuase of the lens distance requirments from the LCD.

[sillyboydarryl]

Hey guys.. theres a good Lcd Projection Panel on Ebay ..

http://cgi.ebay.ca/aw-cgi/eBayISAPI....tem=1693740419


I'll be getting my test shots with a similar Projection Panel up soon.. probably a week.. and I'll try and put some plans up on a website..

I've been lucky in that my grandfather gave me one of those nice screens with that funny glass bits.. kinda sandy.. but it helped even my old 100 inch tv design work nicer..

Best Regards

Darryl

[Bitch]

Why do you have the big glass front?

I guess it could be smaller, if that's what you mean. Anyhow somesort of glass needs to be there instead of wood/metal that the projected stuff from the ohp head can reach it's destination.

How on earth are you going to make your projector look like a giraffe or elephant?!

Uh.. I don't know what sphinx or off-axis projection means. Well if I understood correclty, you want to place your projector at the floor and aim it quite much upwards to the screen and the image will look weird Since I don't know too much about anything, I can't really help you. Expensive OHPs have keystone correction but I have no idea how it works or not ever even actually seen one with it. I don't know how are you going to accomplish it with the software either. I have hard time imaging "Keystone corrector v4.7". Is the keystone correction anything same than the trapezoid and other tweaks in monitor settings?


Fiat, coffee table is good But you probably can't place anything between the coffee table and the projection screen.?


One more thing to say.. It so much pisses me off when every now and then writing some stuff and then accidently press escape and the stuff I wrote just vanishes. But this up to microsoft so **** them.

[Bitch]

This thing doesn't allow me to edit my post anymore so...

anyway Lokos, I forgot to ask: Isn't your image going to be quite small if the projector is near the screen? At least to the wall (presented in my pictures) the projector (ohp tested so far) has to be almost at the other end of the room to fill the whole wall.

[lokost]

Bitch,

Hard to believe, but I can do a cool 80" x 45" from about 4 feet (based on some sloppy experimentation) with the $15 Fujinon lens from Surplushed. The problem is the projector is going to block the viewers view; that is why I am trying to figure out how to keep the projector on the floor and shoot the image without blocking the viewers. Yes, I am planning to warp the image in real time and project it.

On your projector, I thought you would make the projector lens sit on top of box, like some sort of gozilla with one eye.

[gokbektas]

Hi again.

I'll buy a mini LCD TV from streethawkers to start
building of my prototype. It is cheaper and faster
method to buy such equipment rather than buying
from electronics component distributors such as
Farnell in my country. But I am not sure about
will it be useful for me. I may be impossible to
use LCD of TV after removing if they connected
it to the PCB by flat ribbon cables with special
connectors or in worst case, if they used carbon
strips like in the cellular phone and clock displays.
Anyway, I'll try...

I'd some experiments with a negative photograph
film and I get 80" sharp but with poor brightness
and contrast image in ten minutes with
a stupid lamb and with one of the my photo-camera's
lenses. I think it will be better if I could
find very small but high resolution (at least
720x550 pixels) LCD displays. Then, we don't need
fresnel lenses and we can easily focus the image
by using photo-camera lens's built in adjustment.
Epson Seiko develops such HTPS LCDs (high temperature
poly silicon) for projectors but I don't hope
I can buy in less volumes. -only one... ;-)

I really wonder about contrast of the image when
we use standart LCDs. I wish to see some photos
from your prototype's screen if available.
I'm worry about gaining good contrast will be
much more harder than gaining brightness.
Beause of the diffraction from edges of LCD's
pixels and "if dark pixels have some transparency".
Please let me know about this....

As I read in this forum, some people trying to
use ultra bright white LEDs instead of lambs.
What about the experimental results? How many
LEDs did you use and how was the lum. in mcd?