DLP/DMD is promising. I'd also say check out the short throw laser projectors - in particular the new Xiaomi 4k model has native 0.5um pitch, 5000 lumens and only costs ¥10999rmb/€1433 for CNY specials - it uses ALPD 3.0 though as I understand it Appotronics came out with an even newer 4.0 spec in 2018: http://www.appotronicsusa.com/alpd_technology.html -pmg
On Tue, Jan 14, 2020 at 7:00 PM Hagen SANKOWSKI hsank@posteo.de wrote:
Hello.
On 1/14/20 11:08 AM, David Lanzendörfer wrote:
I guess that is both a very ambitious but at the same time very tempting project. Looking forward to seeing self-made litho steppers pop up in hackspaces ;D
Exactly. Yes.
:-)
We can use a DMD[1] which already can go down to 500nm, as I've seen recently[2], assuming, we get the lens system right.
A issue I see here is the pattern structure of DMDs. Between all the small mirrors are always even smaller gaps.
If we like to draw a bar, eg. poly or whatever (ASCII-Art)
^ | v
the mirrors are with a gap instead
+-------+ +-------+ ----- | mirror| |mirror | ^ | | gap | | | | | | | v +-------+ +-------+ -----
|<----->| ???This means that it becomes difficult to "stitch" two mirrors gap-less. For human eyes it does not matter, the eyes does not see the pixel / pattern structure. But I guess, the photo resist will see 'em - so we have to tricked them out somehow.
Can we use here diffraction? Or we already need double-pattering here?
Regards, Hagen.
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