Did anybody try out using two carefully aligned displays on top of each other?

Two displays should focus the beams from the light source a bit better so the spreading of the beams is a little bit canceled and it should be possible to get finer lines. But I am not an light expert.

Does anybody know if there is some optical material which aligns the beams parallel to each other with up to no spreading at leaving the medium?

Here the optical filters to put on top of a display to ensure privacy of the displayed data comes to mind. It prevents reading the data from any angel exept diectly from the top.
But then the light source has to be more powerful and perhaps it cancels the wavelenght we need to cure the resin.

Addition: Did some research:
3M has that type of filters. They block all above +-30 degree of visibilty which is good for focusing and they block 35% of the blue light.
But (as always) they gave lamellars.
There is no „resolution“ given how many of them there are in a cm/inch. But it shurely will have some moire-effect and so this solution is not practical. The display and lamellars would have the same or a n-times of each other to work properly.
—End edit—

Does anybody know a research facility or university which is in this field of science? Would be interesting to get in contact with them here in this thread.

Greetings, Tom

 

@Tosch

That “filter” over the screen sounds as an interesting thread.
As far as I can tell, the screen by itself, and mostly its polarizer (not removable, other wise you won’t be able to form the image), reduces the light outcome in an important degree. I don’t have the means to measure it, but...I know it happens. That’s why is important to take all possible beneficiary variables in account in order to get the most “effective curing light” possible

What I’ve done (that I didn’t mention before) is to use some tiny lenses (plastic ones) specific for the LED modules, that condense the light beam. From the factory setting of 120° of these LEDs to....15° in the 1w array, and right know I change them for some 30° ones (for the on going 5w array), because 15° in the 7cm of distance wasn’t enough to properly cover the surface of the screen. They are reaaaaaally useful and do a great lot to boost the cd (candelas) of the light source.
On top of that I performed several test playing with the digital settings of the screen, such as contrast, brightness and gamma (in individual channels, in duos and all the RGB combined). From those experiences, I got away with the conclusion that by mainly boosting the gamma setting you can get a better performance in curing times. Not a whole lot, but I was able to reduce the layer time by 1s, that....in this “super not sensible” resin is remarkable. I should also remark that this change in gamma didn’t affect the “agglutination” of the resin, which remain even when cured.

Concerning you question about research facilities, not so ling ago, I came across an article of an English university from...2015 (I’m not sure, I have the link to check it if you want) that I believe was the cornerstone for the Photocentric people to develop their enterprise. I....don’t believe that by any mean they will share any of their investigation, they are as closed as f*** when it comes to information. They just...don’t share the vision of this technology we might have. That is concerning “daylight” resins, now....UV ones....they more widely used and for sure there are some other people there on the Internet that can explain better how they work and their capacities. But the bottom line is that the DLP printing is not....so popular and...hasn’t found enough “grip” in actual industry or....activities to be further developed. By trying to be successful in my project I hope for at least my area of interest (designed visual experiences) open a new door, that designers can make use of, and further develop.

Yours, Manuel.

 

Been lurking for quite a while. What do you guys think about this

Boe 10.1 Inch 3840*2160 4K UHD LCD Display for 3D Printer LCD - China Boe 4K LCD, 10.1 Inch 4K LCD | Made-in-China.com

Not an expert on driver boards but wondering if there is one for this

 

Do they offer a display driver?

9 times out of 10 when I find a decent display there is nothing available for it. Given the dimensions and resolution the PPI would be pretty nice. If you plan on daylight resins this might be an easy choice. UV might need some testing.

 

What you say is totally true. Most of times either there’s no availability or is a scam (I nearly got scammed by some website called LCDsource if a recall properly). I would suggest do it through Ali-express or Ali-baba, is the most secure option. Concerning the panel itself, it’s great. I originally was looking for that model but after many conversations the supplier didn’t have any in proper conditions, guess is no longer produced.
@Kyle1988 if you can actually adquire it safely, those are would be great news.

 

Well the last two things I am going to buy to assemble my build will be LCD and the LEDs accordingly. If I end up getting ahold of one I'll let yall know

 

Hi All,

I stumbled across this thread in the process of searching the Internet for design plans/ideas for LCD SLA 3d printers and have to say that evilc66's progress looks awesome. While I haven't, yet, had the chance to go through every post, a quick skim combined with Tosch's recent mention of doubling up LCD screens motivated me to register and make a post.

A few times, in my Internet searching, I came across some DIY LCD SLA experimenters that were discussing the UV transmissivity of various types of LCD panels. Specifically, the discussion was about factors that make the displays less transmissive of UV light. There seemed to be a pretty strong implication that every time you increase the resolution of a display a very large decrease in UV transmissivity is seen. The numbers thrown around seemed to suggest that, for example, going from the average 2K display to a 4K display would mean a decrease from 1000s of prints between LCD burnout to only 100's or even 10's of prints between LCD burnout. Basically, it seemed like the supposed cause of this rapid decrease in panel life was a combination of increased panel heat-up caused by more light being absorbed instead of transmitted along with the resulting need to significantly increase the power of the UV light source to punch through the more opaque panel (there is also the fact that electronics in general, and opto-electronics in particular, have a tendency to fail at a non-linearly increasing rate as the heat and/or luminous flux increases linearly. This is something I know from many years of profession experience working in the engineer section of a lighting manufacturer.). While removing all filter layers on the front of the panel, if that's even possible, would certainly help, I believe that even with that the general consensus seemed to be that it would still shrink the panel life to something absurdly short and to, instead, focus on using a slightly lower resolution panel paired with anti-aliasing to help compensate for the loss in resolution.

This ties in with Tosch's suggestion because I can see doubling up the panels as causing a similar situation. On the other hand, in this case, you now have the possibility of swapping the panels over time (like rotating the tires on a car) to even out the wear rate and/or just having to replace the top panel less often due to it being shielded from a good amount of the heat build-up and luminous flux by the lower panel.

I apologize for not remembering exactly where I saw this discussion, otherwise I would provide a link. While I know there is a good chance you are already familiar with these concepts, I figured I would throw them out there just in case. While they're not, necessarily, a reason to throw out your present plans to experiment with using ultra-high resolution panels they may, at least, help give an avenue to explore in the event that you start seeing unexpectedly rapid panel failures and help avoid some unnecessary extra component expenses. I, also, apologize if this has all been discussed in this thread already and I just missed it in my limited skim.

Regards,

sblaszak

 

I have a related question about the Sharp LS055R1SX04 2K LCD screen. Does anyone know if this panel will pass 365nm light or does the polarizer/filter prevent this? It seems that it is widely used at 405nm. Additionally, what is the best software for direct pixel control of these types of setups? NanoDLP with an mipi to hdmi board or something else?

 

Holy **** I've been dreaming about something like this thread for a while, first post on the forum!

 

Good to see there's still discussion here on SLA printers. I've been planning to build an LCD or DLP printer for a while and slowly accumulated some components when I was given an old 3d systems printer. This is a UV DLP printer with a fairly decent chassis and should make a good candidate for rebuilding as a hackable device that I could use to experiment with new ideas and resin products.

But all the places I'd previously found for DIY SLA builds seem to have gone quiet - is this the only place left to compare notes with other builders or is there an active forum somewhere ?

It seems odd that cheap commercial SLA printers are now quite numerous but software (such as nanoDLP) is mostly closed source and development has disappeared.

 

Does anyone know what model number the phrozen sonic screen is? They claim its a mono screen and thus are getting faster cure times. I cant seem to find anyone who will sell it to me. These guys are out of stock Phrozen Sonic HD LCD Module | FEPshop - 3D printer experts. Seems as though this would be ideal for lower wavelength transmission.