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Making a cheap cheap projector? Answered

I know that it's possible to crack open a "oldish" laptop or even a new one and remove the shielding around the lcd itself and shine a special light through it that's bright enough where you essentially make a lcd projector. I have a old toshiba satellite 2520cds with specs like a 2mb vid card, 96mb of ram, 4 gig hd, and a 300mhz amd processor. It runs somewhat fast, even for windows xp that I installed on it and plan to upgrade the hd down the road, but I wonder, would I be able to do the same thing with this? The screen is an older lcd that has that "motion blur" effect to it, so would it be worth it? Is there some way I could connect this lcd to my video card on my pentium 2 I have that would allow me to actually watch movies?

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LasVegas (author)2007-02-25

No. That is insufficient to make a projector. Think "Lenses."

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rimar2000 (author)LasVegas2007-02-27

The lenses should be VERY BIG so that the brightness is acceptable. I built a projector for a 14 inches TV, and almost I ruined it to use it with the maximum shine and contrast. Later on, I calculated that my apparatus reduced the brightness approximately at 1/13000.

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Punkguyta (author)LasVegas2007-02-25

Well I don't exactly live where they have lenses. I'm pretty sure it would work without lenses, but the distance between the lcd and wall and the light and the lcd would have to be precise and wouldn't allow you to enlarge/shrink it and keep it in focus aswell, am I right? Now where would I get something like that?

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andrestuff (author)Punkguyta2007-02-26

If you had about 10,000 ights that were narrower than laser beams and each one was directly behind the LCD and hitting it squarely then your idea would work. Otherwise no.. it won't because ...

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LasVegas (author)Punkguyta2007-02-25

No they wouldn't. Without any sort of lenses, you would get a blurry light on the wall. Besides that, you would have to rely on the laptop that the LCD came with unless you're going to build your own monitor circuitry.

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Punkguyta (author)LasVegas2007-02-25

Well that would be "Ok" as I can do stuff like run a NES emulator on it and play music. But how hard would it be if I wanted to build the circuitry to hook it up to another pc? Could you "link me up"?

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trebuchet03 (author)Punkguyta2007-02-25

Naw, it wouldn't even be "crappy okay" :P Perhaps pong if the screen is close enough -- but Mrs. PacMan and better is out. I don't live where "they" have suitable lenses either... They being my roommates :P Ebay is a solution for that problem :) Even an overhead projector would work (and it's even got a bulb).

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Punkguyta (author)trebuchet032007-02-25

Ya, I just took it apart and held it up to a 60 watt bulb and the black on the screen makes it impossible to come through bright enough to even cast on a wall. Does this come off or are all lcd black and you just need a really bright light?

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LasVegas (author)Punkguyta2007-02-25

A 60 watt bulb would hardly be enough to shine through. Note that if the monitor isn't on, no light should pass through it.

This Make Magazine Blog Item should give you an idea of what it would take to make it into a projector.

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Punkguyta (author)LasVegas2007-02-25

Well, I could TRY to get my hands on a overhead projector. If I were still in school (got kicked out), I could have "borrowed" one. Could you give me a hand in making this?

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That one is missing a bulb as it says "needs new bulb" and they cost quite a bit.

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trebuchet03 (author)Punkguyta2007-02-25

You gotta search first -- the bulbs are expensive on some machines and cheap on others (typically the one's where a lot of machine were made)....

$2.99 + shipping on eBay for a bulb for that projector -- so the bulbs (wherever you go) won't be too bad :P
http://cgi.ebay.com/EVD-64663-54259-Lamp-Light-Bulb-36V-400W-G6-35-DJ-BNIB_W0QQitemZ250055613652QQcmdZViewItem

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Punkguyta (author)trebuchet032007-02-25

You got good points, now I need to get a paypal and ebay account so I can get some of these things.

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user

you dont even need to get an account on paypal, just ebay.

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user

Ah, but how do you pay for the stuff then?

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trebuchet03 (author)Punkguyta2007-02-26

I've accepted Money Orders and Checks in the past... But I always wait for the money to clear before shipping ;)

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PayPal doesnt require that you have an account to pay people through them, jsut a credit card.

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