probable_possum@leminal.space
on 08 Oct 18:41
nextcollapse
And then they invented the colour wheel. And the DMD with lots of tiny mirrors. And afterwards they used LEDs and laser diodes…
dual_sport_dork@lemmy.world
on 08 Oct 18:58
nextcollapse
The micromirror arrays are the wildest of the bunch to me. That is just such a prima facie batshit insane idea and it’s astonishing that it actually works.
“Yeah, we need to be able to individually display and shut off these pixels, so we’re going to go ahead and design a chip with 6,220,800 tiny mirrors that physically tilt when you poke them with electricity. Rather than, I don’t know, literally any other solution that presents itself.”
Edit2 explanation:
A white light is focused onto the DLP mirror chip through a kind of kaleidoscopic lens, I’ll spare you the details on that. The individual microscopic mirrors are aligned with charges to bounce light. The light pulses and different frames are sent through the spinning color wheel to create a composite image. It’s a fucking insane idea that barely works… and people like me, with low persistence of vision, are not fooled very well and we see color banding and all kinds of weird artifacting lol
SaveTheTuaHawk@lemmy.ca
on 08 Oct 19:51
nextcollapse
still used for a type of advanced microscopy.
TimeSquirrel@kbin.melroy.org
on 08 Oct 20:03
collapse
There was an idea I read about, sorta along the same crazy track, (might have been Popular Science or something like 25 years ago) where they came up with an idea for a jet that didn't use traditional control surfaces like ailerons, but rather line the wings and fuselage in thousands of tiny flaps that would all be precisely computer controlled. It would be able to basically mold and shape the airstream around itself to make precise movements.
acosmichippo@lemmy.world
on 08 Oct 19:11
nextcollapse
So they used to be ridiculously cool, but they’re still ridiculously cool too.
RGB flashing sequentially is the wooooooorst. Most people can't see it but holy shit i can and it's like random colored strobes flashing everywhere. Bleh
We had one in an auditorium where I work. Only problem is it was underneath an MRI scanner. Every time they’d open the door to the MRI, the magnetic field would knock the projector tubes out of alignment.
The technician who came out to work on it said it was hopeless. He told us he had a customer whose projector would get out of alignment if he moved a speaker in the room.
I was so happy when we finally replaced it with an LCD projector.
threaded - newest
And then they invented the colour wheel. And the DMD with lots of tiny mirrors. And afterwards they used LEDs and laser diodes…
The micromirror arrays are the wildest of the bunch to me. That is just such a prima facie batshit insane idea and it’s astonishing that it actually works.
“Yeah, we need to be able to individually display and shut off these pixels, so we’re going to go ahead and design a chip with 6,220,800 tiny mirrors that physically tilt when you poke them with electricity. Rather than, I don’t know, literally any other solution that presents itself.”
It sounds insane, but the array that drives it is functionally not that different from the array that individually causes LCD crystals to shift.
I have DLP parts sitting around because they’re cool.
Edit pics: <img alt="" src="https://lemmy.world/pictrs/image/5286025a-ae99-4a00-8ace-7a61d3ad3265.jpeg">
<img alt="" src="https://lemmy.world/pictrs/image/d8348a51-25b8-484c-97bd-c479ae628e68.jpeg">
Edit2 explanation: A white light is focused onto the DLP mirror chip through a kind of kaleidoscopic lens, I’ll spare you the details on that. The individual microscopic mirrors are aligned with charges to bounce light. The light pulses and different frames are sent through the spinning color wheel to create a composite image. It’s a fucking insane idea that barely works… and people like me, with low persistence of vision, are not fooled very well and we see color banding and all kinds of weird artifacting lol
still used for a type of advanced microscopy.
There was an idea I read about, sorta along the same crazy track, (might have been Popular Science or something like 25 years ago) where they came up with an idea for a jet that didn't use traditional control surfaces like ailerons, but rather line the wings and fuselage in thousands of tiny flaps that would all be precisely computer controlled. It would be able to basically mold and shape the airstream around itself to make precise movements.
So they used to be ridiculously cool, but they’re still ridiculously cool too.
RGB flashing sequentially is the wooooooorst. Most people can't see it but holy shit i can and it's like random colored strobes flashing everywhere. Bleh
I believe the crt projector doesnt have that issue
I was referring to the spinning color wheel that op was taking about, but yeah the simultaneous three color projector likely doesn't have that problem
We had one in an auditorium where I work. Only problem is it was underneath an MRI scanner. Every time they’d open the door to the MRI, the magnetic field would knock the projector tubes out of alignment.
The technician who came out to work on it said it was hopeless. He told us he had a customer whose projector would get out of alignment if he moved a speaker in the room.
I was so happy when we finally replaced it with an LCD projector.