Follow

I think I would expect a true light field display to work like a planar fourier capture array but in reverse

· · Web · 2 · 0 · 3

basically each pixel has a ton of micro-pixels, that emit light in different spread harmonics. you can imagine each pixel being sent a fourier transform of the shape of light that should be emitting from it

you should read about PFCAs, they're fucking fascinating. flat camera with no lens that can be fabbed with the same technology we use to make CPUs en.wikipedia.org/wiki/Planar_F

"angle sensitive pixel" is what each micro-pixel that I spoke about is. en.wikipedia.org/wiki/Angle-se

the article only speaks about it in terms of receiving light, not emitting light. I'm not a physicist but I feel like, maybe it should work both ways?

I have no idea how small you can make an LED so that it fits behind the diffraction grating

I'm surprised that all the angle-sensitive pixel research seems to only be about lightfield capture and not display. you can build a large scale one really easily with moire patterns. I guess the massive problem is scaling down

you know what, I actually bet the fatal flaw would be that the emitters would be too dim to be visible

@SuricrasiaOnline I'm imagining an optical phased array and vibrating several feet into the air

@cinebox that's almost the idea except each sub-pixel has a fixed phase tunings or however you might call it

@SuricrasiaOnline would this also be capable of arbitrary-frequency color

@cinebox I don't think so. iirc from the paper the structure of the receivers (in my idea, the emitters) have to be tuned based on the expected frequency of the light coming in, because they work on the principle of interference

@SuricrasiaOnline this sounds, frighteningly plausible to construct the more I read about PFCAs

@SuricrasiaOnline I think this is basically just a fun physics trick for doing phased arrays by letting physics do all your fancy math

@SuricrasiaOnline you basically cant do LEDs on silicon (not visible ones anyways) so you're probably limited to µLEDs which seem to be around 5µm with current tech

@SuricrasiaOnline spectrum.ieee.org/nanoclast/se This article explains why you can do visible photodiodes on silicon but not LEDs. Its a weird quirk of how silicon's crystal structure works that I still don't fully understand

@SuricrasiaOnline how can it be a massive problem if you're trying to make it smaller? checkmate liberals :ms_shark_think:

@SuricrasiaOnline probably "when optoelectronics saves moore's law", if that ever happens, doing this kinda thing will get a lot easier and the whole thing will be implemented using lasers or something

@SuricrasiaOnline Don't you normally zap stuff into the diffraction grating from the side?

Sign in to participate in the conversation
Cybrespace

cybrespace: the social hub of the information superhighway jack in to the mastodon fediverse today and surf the dataflow through our cybrepunk, slightly glitchy web portal support us on patreon or liberapay!