Slashdot Mirror

← Back to Stories (view on slashdot.org)

Homebrewed LCD Projectors

Posted by timothy on from the depends-what-you-call-simple dept.

pseudofrog writes: "Seems the new thing to do may be to build your own LCD projector. For a couple hundred bucks, some guys are making projectors similar to the professional ones that cost thousands. And it looks pretty simple, too."

7 of 207 comments (clear)

  1. How Dissapointing... by flewp · · Score: 4, Funny

    Here I thought the headline was "Homebrewed LSD Projections"... having to do with homemade LSD visions.

    --
    WWJD.... for a Klondike bar?
  2. Google cache by InsaneCreator · · Score: 4, Informative

    See this page cached@google :)

  3. Re:Reasons for Skepticism by Anonymous Coward · · Score: 5, Informative
    In fact, the image quality on these systems can be much better than your typical projection television. I have a system such as follows:
    • Book sided pc with a Celeron 566/128mb, integrated sound (mostly left over parts+$75 for the case)
    • Generic BT848 tv tuner ($50 CompUsa)
    • Dukane 4000 lumen projector (ebay $100)
    • Active matrix Nview projector panel capable of 1024x786 native resolution ($200)
    Total $425

    I also got a 72" wide screen for $75 retail, but a flat white wall will do almost as well.

    The quality on the system with DScaler is very impressive at 1024x768. The only difference in parts between what I have an the author of the linked site is that I've not tried putting it all in a box. Currently it all sites on an end table next to my couch and projects onto a screen which hangs down from rafters. I see no reason why putting in a box would make a difference in the quality. It would probably make it better by blocking out extraneous light that escapes from the overhead projector.

    Now while the quality is excellent (you have to play with the brightness/contrast to get a good picture), there are quite a few drawbacks that don't have to do with image quality:

    • It get's damn hot. A 4000 lumen overhead projector bulb will heat up a small room pretty quickly. Fortunately I have very high ceilings (the screen hangs off rafters) so it's not too much of a problem
    • The fan in the overhead can be pretty loud, but I only use the projector for DVDs, and the volume of the movie is usually set pretty high.
    • The bulbs only last 75-100 hours. They only cost about $7 each (less in bulk), and my projector has a backup bulb replacement switch so it's rarely an inconvenience. The current halogen bulbs for stand alone projectors typically last 2000+ hours.
    • It's pretty ugly. After all it is an overhead projector on an end table, so it looks very out of place in a living room.

    My setup could use a little more CPU power. A better graphic card would be good too 'cause I had to settle on a Geforce 2 MX 200 because it was the best half height video card I could find. Also a sound card with a dolby decoder would make it even better.

    It does work, 'though, and looks great, but as you can see it's not perfect.

    -dameron

  4. Re:LCD/oLEDs by wirelessbuzzers · · Score: 5, Funny

    Just think, you could have the Windows "Clouds" wallpaper all over your room! Imagine that! Gee, if that were my wallpaper, I know I'd feel like I was actually in the clouds.

    Really? If I had the Windows "Clouds" wallpaper all over my room, I'd feel like I was in Hell!

    Moderation Totals: Flamebait=1, Troll=1, Total=2.

    --
    I hereby place the above post in the public domain.
  5. other than hack value.... why? by Lumpy · · Score: 4, Informative

    You can get 800X600 lcd projectors on ebay for less than $500.00
    and these dont need a computer, just plug in composite video.. (I can hear it now the videophiles that have their 2048p projectors that use fiberoptic digital video and HDTV ready HD-DVD players will whine that it's grainey,low light because it's lower than 95,000 lumens and doesnt have glass lenses made by Plossol in germany... Go to hell videophiles..)

    The dayton hamfest is coming up very soon, you can get a (GASP) old technology video-tube projection tv for probably less than $300.00 that works fine. (granted, it's a coffee table, but hey...)

    the golden rule is that you scroung for a used one first, then look for cheap new, and THEN create it by hand.

    --
    Do not look at laser with remaining good eye.
  6. Does it work really? by pinkpineapple · · Score: 5, Interesting

    My main interest is playing movies on the wall of my living room.

    This project looks nice if I can find someone to do it for me that is.

    I have a few concerns though.
    1) Aren't dvd players using Macrovision to forbid a signal to be output on anything else than a TV? The signal going to a video capture card seems to be a slight problem. Is this a reason why every one in the article is talking about LD and VCD, these two older media not suffering of the Macrovision "virus", er copy protection.
    2) Is this really cheap? I mean a dedicated P800 in the living room (cpu speed to cope with descaler complex algorithm)+capture card+LCD panel, etc... I don't even mention the electric bill.
    3) Noise level: Getting a Pentium noisy as an air carrier next to a TV and adding the noise of the fan(s) for cooling down the bulb(s), does that meant that I will need to listen to the movie with a pair a noise cancelling headphones?
    4) Space: I imagine that the distance from the projector to the screen needs to be consequent. I can't find data regarding the minimum size of a room to use the projector.

    I still like the idea though.

    PPA, the girl next door.

    --
    -- I feel better now. Thanks for asking.
  7. Scam warning on building the LCD monitor described by eyefish · · Score: 5, Informative

    Please note that the monitor suggested for the experiment (at this link), claims to have a resolution of "960(H) X RGB x 240 (V)=230400" which can be a bit misleading if you're not too tech-savy on these numbers.

    Note that the horizontal resolution is NOT 960 pixels, but rather 320, since they're counting each RGB pixel as THREE pixels (very sneaky indeed).

    So just be warned in case you thought this was the deal of the century.