DIY Video Projector - Page 5

vdi_nenna · 13th July 2001, 09:51 PM

NICE! Yeah, the more resolution, the better! I thought about using 3 LCDs, but wasn't sure where to find the monochrome LCDs. That would be an excellent experiment. Only thing being that alignment becomes more of an issue, but probably worth it. It would be brighter and I beieve it can create even more colors. Check out my original post on page one. Look for the Sharp site. It shows the setup for 3 LCD projectors. You need to use dichrotic mirrors that only reflect the color for say red, green, or blue. But if you use LEDs as a light source, it won't need to be as complicated.

How bright was it? Don't even think about looking into it's path! It hurts even for a split second. It really is like a spot light. Perfect circle too. When I first ran it w/ the single lense, you could see there were patches of dark because of how I set up my LEDs on seperate tiny boards. Not w/ a condenser though. It was evenly dispersed. I'm also testing it w/ an open case, so there is light polution in the room.

I recommend ONE board w/ a tight grouping of LEDs.
I tried to be fancy and make a pattern like an octagon, but it's tough, unless you make your own board. I used perfboard and hard-wired them.

I would love to try something w DLPs! You would only need one. One of you guys linked to a site where they show how that's done. That would be the way to go. I also have white papers on how CRT projectors work. I'm basing my work on both LCD and CRT, like a hybrid.

Vince

vdi_nenna · 17th July 2001, 05:34 PM

http://www.citizen-america.com/OEM/lcd/tb56.htm

Here's one that would be perfect.

rjacobs · 23rd July 2001, 04:51 PM

I was playing for years with the idea to make my own video projector! This is great!

I'm just start experimenting with two old laptop LCD displays (800X600 color TFT screens) Just found the pinout of the connector, next phase is trying to get a video signal on these things.

Robin

vdi_nenna · 23rd July 2001, 05:42 PM

Try this place for help. Let us know if you figue this out. I'm going to try to figure out how to input R-G-B inputs for the screen I have with component or S-Video. If it's a known screen, some of these guys may be able to help.

http://www.eio.com/lcdintro.htm

tim0 · 23rd July 2001, 06:22 PM

Hi Robin,

I have an old laptop with worn out battery and 14"/800x600 TFT. The processor is too slow to play MPEG etc and DVD...
i also wonder if the TFT is fast enough.
Haven't had time yet to open it up and see if a bright back light can be added...
How do you plan to get analog video into the box? Maybe it would be easiest to get a outboard video card (pcmcia tv card?) but of course quality would suffer.

Timo

rjacobs · 24th July 2001, 11:47 AM

For interfacing (laptop) lcd screen with PAL/NTSC video take a look at http://www.sageinc.com/products/boardsupport.html
And click on the Puma 2, it seems the perfect board for doing just that! (Although I don't know the price :-(

Robin

rjacobs · 24th July 2001, 01:32 PM

Take a look at http://www.noah.org/acidwarp/warper.html

It's a (very) low budget video projection project. It uses a normal (computer) monitor and a fresnel lens. (about $25,-) I suppose the brightness of this system is very low but I imagine that a LCD panel with a beefed up backlight (50 white leds) would give a pretty good image. (In the original design the image is upside down but turn the LCD would fix that :-)

Robin

tim0 · 24th July 2001, 05:39 PM

The Warper is coool. ...
What i have in mind is similar, but uses the lens of a OHP (overhead projector). The image has to be sharp, i have to be able to read text on the projected image so a fresnel lens is not an option.
I would first set this up "warper-style" without additional backlight. But first i need to find a lens. :-)
OHP lenses should be available from the manufacturers as spare parts.

Timo

vdi_nenna · 24th July 2001, 08:43 PM

Robin,

That's what I need. Just have to make sure it will interface w/ my LCD screen. Sounds like it will.

There is a site that might have what you need. They have prices too.

http://www.earthlcd.com/

vdi_nenna · 27th July 2001, 09:33 PM

Found DMD chips for DLP projectors, with several relivent parts. Here's the site.

http://www.lasersurplus.com/optics.htm

17th July 2001, 05:34 PM	#42
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	MonoChrome Displays http://www.citizen-america.com/OEM/lcd/tb56.htm Here's one that would be perfect.

27th July 2001, 09:33 PM	#50
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Found DLP Chips for sale! Found DMD chips for DLP projectors, with several relivent parts. Here's the site. http://www.lasersurplus.com/optics.htm

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13th July 2001, 09:51 PM	#41
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	NICE! Yeah, the more resolution, the better! I thought about using 3 LCDs, but wasn't sure where to find the monochrome LCDs. That would be an excellent experiment. Only thing being that alignment becomes more of an issue, but probably worth it. It would be brighter and I beieve it can create even more colors. Check out my original post on page one. Look for the Sharp site. It shows the setup for 3 LCD projectors. You need to use dichrotic mirrors that only reflect the color for say red, green, or blue. But if you use LEDs as a light source, it won't need to be as complicated. How bright was it? Don't even think about looking into it's path! It hurts even for a split second. It really is like a spot light. Perfect circle too. When I first ran it w/ the single lense, you could see there were patches of dark because of how I set up my LEDs on seperate tiny boards. Not w/ a condenser though. It was evenly dispersed. I'm also testing it w/ an open case, so there is light polution in the room. I recommend ONE board w/ a tight grouping of LEDs. I tried to be fancy and make a pattern like an octagon, but it's tough, unless you make your own board. I used perfboard and hard-wired them. I would love to try something w DLPs! You would only need one. One of you guys linked to a site where they show how that's done. That would be the way to go. I also have white papers on how CRT projectors work. I'm basing my work on both LCD and CRT, like a hybrid. Vince

23rd July 2001, 04:51 PM	#43
rjacobs diyAudio Member Join Date: Jul 2001	I was playing for years with the idea to make my own video projector! This is great! I'm just start experimenting with two old laptop LCD displays (800X600 color TFT screens) Just found the pinout of the connector, next phase is trying to get a video signal on these things. Robin

23rd July 2001, 05:42 PM	#44
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Try this place for help. Let us know if you figue this out. I'm going to try to figure out how to input R-G-B inputs for the screen I have with component or S-Video. If it's a known screen, some of these guys may be able to help. http://www.eio.com/lcdintro.htm

23rd July 2001, 06:22 PM	#45
tim0 diyAudio Member Join Date: Apr 2001 Location: Germany	Hi Robin, I have an old laptop with worn out battery and 14"/800x600 TFT. The processor is too slow to play MPEG etc and DVD... i also wonder if the TFT is fast enough. Haven't had time yet to open it up and see if a bright back light can be added... How do you plan to get analog video into the box? Maybe it would be easiest to get a outboard video card (pcmcia tv card?) but of course quality would suffer. Timo

24th July 2001, 11:47 AM	#46
rjacobs diyAudio Member Join Date: Jul 2001	For interfacing (laptop) lcd screen with PAL/NTSC video take a look at http://www.sageinc.com/products/boardsupport.html And click on the Puma 2, it seems the perfect board for doing just that! (Although I don't know the price :-( Robin

24th July 2001, 01:32 PM	#47
rjacobs diyAudio Member Join Date: Jul 2001	Take a look at http://www.noah.org/acidwarp/warper.html It's a (very) low budget video projection project. It uses a normal (computer) monitor and a fresnel lens. (about $25,-) I suppose the brightness of this system is very low but I imagine that a LCD panel with a beefed up backlight (50 white leds) would give a pretty good image. (In the original design the image is upside down but turn the LCD would fix that :-) Robin

24th July 2001, 05:39 PM	#48
tim0 diyAudio Member Join Date: Apr 2001 Location: Germany	The Warper is coool. ... What i have in mind is similar, but uses the lens of a OHP (overhead projector). The image has to be sharp, i have to be able to read text on the projected image so a fresnel lens is not an option. I would first set this up "warper-style" without additional backlight. But first i need to find a lens. :-) OHP lenses should be available from the manufacturers as spare parts. Timo

24th July 2001, 08:43 PM	#49
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA	Robin, That's what I need. Just have to make sure it will interface w/ my LCD screen. Sounds like it will. There is a site that might have what you need. They have prices too. http://www.earthlcd.com/

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