3 ms·

I built a similar LCD projector when I was in high school! Same basic principal as is used here, shine light through a bare LCD panel (mine was from a broken l

by ktm5j 6y ago

I built a similar LCD projector when I was in high school! Same basic principal as is used here, shine light through a bare LCD panel (mine was from a broken laptop), add some fresnel lenses and a focusing lens and throw it all in a box. Pretty cool, but just buy a damn projector. Do not approach this as something practical that's going to be useful, because it's not. It's huge, probably loud, you'll get dust and stuff stuck in all sorts of places messing with the image and it lacks advanced focusing like keystone transform https://en.wikipedia.org/wiki/Keystone_effect https://en.wikipedia.org/wiki/Keystone_effect

soylentcola 6y ago
Yeah, we did something similar in our apartment in the early 2000's. It was one of those old overhead projector/fresnel lens/repurposed monitor LCD panel deals that were all over the internet at the time. It was a cool project and when it was just me and a friend sharing an apartment, we didn't care that it was janky (especially since any large format screen was way too expensive for us at the time). But now you can get better performance from a cheapo projector and for a bit more, you can even find decent short-throw models these days. My current project (that is collecting dust) is a big dual-lamp auditorium sized Epson that I snagged when it was getting tossed out at work. Sadly, while it was working when I picked it up, somewhere along the way from the office and through a couple of moves the auto-iris got stuck/damaged. It's the most frustrating thing because the projector works fine but when it powers on, there's an error message stating that the auto iris has an error and it won't let you proceed. I don't even care about the auto iris and while I've dismantled it quite a bit and blown out/lubed everything I could find, I still get the error. Apparently they all had this problem but it's way out of warranty and I don't see much point in paying to have a free projector repaired.

by ktm5j 6y ago

soylentcola 6y ago

Yeah, we did something similar in our apartment in the early 2000's. It was one of those old overhead projector/fresnel lens/repurposed monitor LCD panel deals that were all over the internet at the time. It was a cool project and when it was just me and a friend sharing an apartment, we didn't care that it was janky (especially since any large format screen was way too expensive for us at the time). But now you can get better performance from a cheapo projector and for a bit more, you can even find decent short-throw models these days. My current project (that is collecting dust) is a big dual-lamp auditorium sized Epson that I snagged when it was getting tossed out at work. Sadly, while it was working when I picked it up, somewhere along the way from the office and through a couple of moves the auto-iris got stuck/damaged. It's the most frustrating thing because the projector works fine but when it powers on, there's an error message stating that the auto iris has an error and it won't let you proceed. I don't even care about the auto iris and while I've dismantled it quite a bit and blown out/lubed everything I could find, I still get the error. Apparently they all had this problem but it's way out of warranty and I don't see much point in paying to have a free projector repaired.