Making a cheap cheap projector?

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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LasVegas10 years ago
No. That is insufficient to make a projector. Think "Lenses."
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.
Punkguyta (author)  rimar200010 years ago
So where would I possibly get lenses?
It is not easy (anything easy) to get a lens of the size that is necessary to project the image of the TV on the wall with an acceptable brightness. It would have to have a diameter of several inches. There is not a number because there is not a limit. As I related previously, I used some lenses of few centimeters of diameter and almost I ruined the TV. For some time I want to make a big lens with a "sandwich" of two policarbonate or acrylic badges separated by a latex border, padded with a crystalline liquid as glycerine, liquid petrolates or something like that, but I don't have time.
Punkguyta (author)  rimar200010 years ago
I figured as much, I know you can get frensels of some sort out of old projectors. Or I could just find a old projector all together (By projector I mean overhead style) and lay the screen on there. But again comes the issue of where to find/buy something like that.
Maybe a flat (Fresnel) plastic lens with near 2 dioptries...
Punkguyta (author)  LasVegas10 years ago
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?
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 ...
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.
Punkguyta (author)  LasVegas10 years ago
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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