DIY Video Projector

[vdi_nenna]

I just made an offer to buy a 640x480 panel also. It takes VGA input. I found an S-Video to VGA converter for $79 that also upsamples the input to svga, doubling the scan rate.

http://www.ramelectronics.net/html/v...a_adapter.html

[rjacobs]

To the same panel? (a Telex Magnabyte M2X)

I've just been outbid for mine; I'm thinking if I will go any higher, but if it's how's bidding it would be stuppid to raise the price any further.

Robin

[vdi_nenna]

No, I got it off another site. Not Ebay. I got a Megapower, or Megalite. Anyway, I made an offer to a seller for $150 and they took it. I'm just waiting for shipping charges to complete the transaction.

[tim0]

Robin,

The Sales Manager of Fresnel-Optics Germany replied to my email, and he said that the company usually only sells to systems manufacturers (sure, how many optics amateurs are there????) and to sell a lens to me they have to know the exact specs.
But he gave some examples:
OHP lens costs E 31 without taxes, and a RPTV lens (US import) dimension 790 x 1040 mm costs E 560.

Regards
Timo

[rjacobs]

Timo,

Well I don't think I buy something for those prices :-(

Thanks for the trouble.

Robin

[vdi_nenna]

I'm real close now to getting this all together. The image from the panel looks real nice. I took the panel apart; it would be easy to transfer the guts to my enclosure.

I found the panel accepts S-Video for connecting to a DVD player for better picture quality.

I'm going to use 2 fresnel lenses before the LCD and a 75mm plano-convex after. The latter was recommended to me by a tech at Edmund Optics. He was very helpful.

I only need the three lenses and I can start testing again.

Later

Vince

[vdi_nenna]

I found frensel lenses, also known as page magnifiers at office supply store. They had the 2 sizes I needed. One was the size a a page, 8.5"x11" the other 2"x3". Got both for about $10 US. I bought these at OfficeMax, but I saw the 8.5x11 on the Staples site for $7.49 also.

They have a magnification of about 2x. I'm placing the small frensel first, then the larger before the LCD.

Just one lense to go.

Vince

[flanker20]

If all the LCD-panels we can find are about 320 x 240, how sony could built the vpl vw10ht with 1366 x 768 ?

[vdi_nenna]

That's a good question. One that I'd like a better answer to. There are high resolution color LCDs, but they are expensive as hell for just one.

Most LCD projectors use 3 monochrome LCDs. The light color is divided by dichrotic mirrors. They reflect R,B or green and pass all other light. These monochrome LCD are probably cheaper to make then color ones. Check out some of the previous replies for hi resolution color LCDs.

I got the last lense yesterday. It looks real good. I want to start putting it together this weekend, if time allows.

Vince

[tvi]

might be of interest:

<a href="http://www.allelec.com/VGALCDMono.html">VGA LCD Screen with controller.....$89.00</a>
<i>Totally self contained, all power is supplied by the controller card. Great for projects, corners, limited space areas. Use these for NT, Novel servers. The metal frame around the LCD is removable. The there are no controls for the backlight, you will need to provide a momenty SPST switch. The DC inverter PCB is mounted on the rear of the display assembly.

<li>Cirrus Logic 16 Bit (ISA) 512K Controller Non-upgradable.
<li>640x480 Resolution
<li>VGA Compatible
<li>16 Gray scale
<li>Windows 3.1/9x
<li>Linux (XF86_SVGA) compatible
<li>Windows NT
<li>5 7/8 x 10 3/8
<li>9.6 in diagonal viewing area.</i>


Regards
James