OK. That happened (Funding)
Hi folks So on Wednesday, 10 am Portuguese time, I'm having a ZOOM conference with the other folks of the Photonics lab at INL, where I'll be showing a presentation I'm right now tinkering together. The goal is to use LibreSilicon in combination with their Integrated Photonics, in order to build neuromorphic chips. By becoming part of Jana's research project (she's a professor for photonics at INL), she and I can make LibreSilicon part of the university projects which would make it subject to direct EU funding. Just a heads up. Cheers -lev
Looking up to it, and good luck! It would be very interesting to see how was the progress on the maskless? Have either DLP, or MicroLED matrix gone beyond the drawing board stage? On Mon, Sep 14, 2020 at 5:57 PM David Lanzendörfer < leviathan@libresilicon.com> wrote:
Hi folks So on Wednesday, 10 am Portuguese time, I'm having a ZOOM conference with the other folks of the Photonics lab at INL, where I'll be showing a presentation I'm right now tinkering together. The goal is to use LibreSilicon in combination with their Integrated Photonics, in order to build neuromorphic chips. By becoming part of Jana's research project (she's a professor for photonics at INL), she and I can make LibreSilicon part of the university projects which would make it subject to direct EU funding. Just a heads up.
Cheers -lev_______________________________________________ Libresilicon-developers mailing list Libresilicon-developers@list.libresilicon.com https://list.libresilicon.com/mailman/listinfo/libresilicon-developers
Hi So about the maskless stepper aligner. Turns out those folks already have developer their own MicroLED displays in the process of manufacturing photonic circuitry. Jana is right now assembling a project sheet for a microscope system, I could develop for them and get paid for. The funny part is, that with a few modifications the same system could be turned into a maskless stepper aligner using their displays. So they might actually pay me for doing the heavy lifting on the stepper aligner... However, I have heard back from INL yet, and was busy working on some other side jobs, that's why I overlooked this email until now. Cheers -lev On Tuesday, September 15, 2020 5:08:29 AM WET Pavel Nikulin wrote:
Looking up to it, and good luck!
It would be very interesting to see how was the progress on the maskless? Have either DLP, or MicroLED matrix gone beyond the drawing board stage?
On Mon, Sep 14, 2020 at 5:57 PM David Lanzendörfer <
leviathan@libresilicon.com> wrote:
Hi folks So on Wednesday, 10 am Portuguese time, I'm having a ZOOM conference with the other folks of the Photonics lab at INL, where I'll be showing a presentation I'm right now tinkering together. The goal is to use LibreSilicon in combination with their Integrated Photonics, in order to build neuromorphic chips. By becoming part of Jana's research project (she's a professor for photonics at INL), she and I can make LibreSilicon part of the university projects which would make it subject to direct EU funding. Just a heads up.
Cheers -lev_______________________________________________ Libresilicon-developers mailing list Libresilicon-developers@list.libresilicon.com https://list.libresilicon.com/mailman/listinfo/libresilicon-developers
Glad to hear that David, I recently heard that JBD is still alive, kicking, and are finally ready to sell stuff on the open market. I doubt you will ever want to deal with a Chinese company again, but if not, you can think of using them to fab the LED matrix. The biggest asset they have is a know-how for how to put many dissimilar semiconductors onto silicon wafers. On Mon, Nov 2, 2020 at 12:21 AM David Lanzendörfer < leviathan@libresilicon.com> wrote:
Hi So about the maskless stepper aligner. Turns out those folks already have developer their own MicroLED displays in the process of manufacturing photonic circuitry. Jana is right now assembling a project sheet for a microscope system, I could develop for them and get paid for. The funny part is, that with a few modifications the same system could be turned into a maskless stepper aligner using their displays. So they might actually pay me for doing the heavy lifting on the stepper aligner... However, I have heard back from INL yet, and was busy working on some other side jobs, that's why I overlooked this email until now.
Cheers -lev
On Tuesday, September 15, 2020 5:08:29 AM WET Pavel Nikulin wrote:
Looking up to it, and good luck!
It would be very interesting to see how was the progress on the maskless? Have either DLP, or MicroLED matrix gone beyond the drawing board stage?
On Mon, Sep 14, 2020 at 5:57 PM David Lanzendörfer <
leviathan@libresilicon.com> wrote:
Hi folks So on Wednesday, 10 am Portuguese time, I'm having a ZOOM conference with the other folks of the Photonics lab at INL, where I'll be showing a presentation I'm right now tinkering together. The goal is to use LibreSilicon in combination with their Integrated Photonics, in order to build neuromorphic chips. By becoming part of Jana's research project (she's a professor for photonics at INL), she and I can make LibreSilicon part of the university projects which would make it subject to direct EU funding. Just a heads up.
Cheers -lev_______________________________________________ Libresilicon-developers mailing list Libresilicon-developers@list.libresilicon.com https://list.libresilicon.com/mailman/listinfo/libresilicon-developers
Hi Pavel I'm totally happy to keep on working with Chinese companies. Now that I've left I just realized how much China was like the first true home I ever had in my life. It's cool that there are so many people from China living here in Portugal. Because I hardly speak any Portuguese yet, we always have to fall back to 普通话 and everyone immediately notices that I've learned it in Guangdong. 哈哈 A woman who works as professor and is my link in INL is right now learning Chinese and is picking up my terrible accent from 宝安/东莞 and 深圳 in general xD She's helping me with filing all the paperwork to get started. As I've mentioned previously, they're already working on a system, similar to ours, so if JBD could deliver the imaging chip, it would be fantastic, because we'd just have to put it together. How many mega pixels can they deliver? How much money will it be? Cheers -lev On Friday, November 13, 2020 12:37:07 PM WET Pavel Nikulin wrote:
Glad to hear that David,
I recently heard that JBD is still alive, kicking, and are finally ready to sell stuff on the open market. I doubt you will ever want to deal with a Chinese company again, but if not, you can think of using them to fab the LED matrix. The biggest asset they have is a know-how for how to put many dissimilar semiconductors onto silicon wafers.
On Mon, Nov 2, 2020 at 12:21 AM David Lanzendörfer <
leviathan@libresilicon.com> wrote:
Hi So about the maskless stepper aligner. Turns out those folks already have developer their own MicroLED displays in the process of manufacturing photonic circuitry. Jana is right now assembling a project sheet for a microscope system, I could develop for them and get paid for. The funny part is, that with a few modifications the same system could be turned into a maskless stepper aligner using their displays. So they might actually pay me for doing the heavy lifting on the stepper aligner... However, I have heard back from INL yet, and was busy working on some other side jobs, that's why I overlooked this email until now.
Cheers -lev
On Tuesday, September 15, 2020 5:08:29 AM WET Pavel Nikulin wrote:
Looking up to it, and good luck!
It would be very interesting to see how was the progress on the maskless? Have either DLP, or MicroLED matrix gone beyond the drawing board stage?
On Mon, Sep 14, 2020 at 5:57 PM David Lanzendörfer <
leviathan@libresilicon.com> wrote:
Hi folks So on Wednesday, 10 am Portuguese time, I'm having a ZOOM conference with the other folks of the Photonics lab at INL, where I'll be
showing a
presentation I'm right now tinkering together. The goal is to use LibreSilicon in combination with their Integrated Photonics, in order to build neuromorphic chips. By becoming part of Jana's research project (she's a professor for photonics at INL), she and I can make LibreSilicon part of the university
projects
which would make it subject to direct EU funding. Just a heads up.
Cheers -lev_______________________________________________ Libresilicon-developers mailing list Libresilicon-developers@list.libresilicon.com https://list.libresilicon.com/mailman/listinfo/libresilicon-developers
Then, I think it's worth contacting them. The guy behind the company is Qiming Li. He is the one who has the wafer bonding tech http://www.jb-display.com.cn/?page_id=13375 Given that you probably need AlN to get deep enough UV, there is no guarantee that it will work with them. But they do have GaN on Si done, which means they can get very close to i-line lamps which were used back in the eighties. As for megapixels, they previously had 10,000 DPI prototypes. On Sat, Nov 14, 2020 at 5:16 AM David Lanzendörfer < leviathan@libresilicon.com> wrote:
Hi Pavel I'm totally happy to keep on working with Chinese companies. Now that I've left I just realized how much China was like the first true home I ever had in my life. It's cool that there are so many people from China living here in Portugal. Because I hardly speak any Portuguese yet, we always have to fall back to 普通话 and everyone immediately notices that I've learned it in Guangdong. 哈哈 A woman who works as professor and is my link in INL is right now learning Chinese and is picking up my terrible accent from 宝安/东莞 and 深圳 in general xD She's helping me with filing all the paperwork to get started. As I've mentioned previously, they're already working on a system, similar to ours, so if JBD could deliver the imaging chip, it would be fantastic, because we'd just have to put it together. How many mega pixels can they deliver? How much money will it be?
Cheers -lev
On Friday, November 13, 2020 12:37:07 PM WET Pavel Nikulin wrote:
Glad to hear that David,
I recently heard that JBD is still alive, kicking, and are finally ready to sell stuff on the open market. I doubt you will ever want to deal with a Chinese company again, but if not, you can think of using them to fab the LED matrix. The biggest asset they have is a know-how for how to put many dissimilar semiconductors onto silicon wafers.
On Mon, Nov 2, 2020 at 12:21 AM David Lanzendörfer <
leviathan@libresilicon.com> wrote:
Hi So about the maskless stepper aligner. Turns out those folks already have developer their own MicroLED displays in the process of manufacturing photonic circuitry. Jana is right now assembling a project sheet for a microscope system, I could develop for them and get paid for. The funny part is, that with a few modifications the same system could be turned into a maskless stepper aligner using their displays. So they might actually pay me for doing the heavy lifting on the stepper aligner... However, I have heard back from INL yet, and was busy working on some other side jobs, that's why I overlooked this email until now.
Cheers -lev
On Tuesday, September 15, 2020 5:08:29 AM WET Pavel Nikulin wrote:
Looking up to it, and good luck!
It would be very interesting to see how was the progress on the maskless? Have either DLP, or MicroLED matrix gone beyond the drawing board stage?
On Mon, Sep 14, 2020 at 5:57 PM David Lanzendörfer <
leviathan@libresilicon.com> wrote:
Hi folks So on Wednesday, 10 am Portuguese time, I'm having a ZOOM conference with the other folks of the Photonics lab at INL, where I'll be
showing a
presentation I'm right now tinkering together. The goal is to use LibreSilicon in combination with their Integrated Photonics, in order to build neuromorphic chips. By becoming part of Jana's research project (she's a professor for photonics at INL), she and I can make LibreSilicon part of the university
projects
which would make it subject to direct EU funding. Just a heads up.
Cheers -lev_______________________________________________ Libresilicon-developers mailing list Libresilicon-developers@list.libresilicon.com
https://list.libresilicon.com/mailman/listinfo/libresilicon-developers
Hello Everyone, I did some paper-pencil calculations on what we know about these displays. I put it here: https://redmine.libresilicon.com/projects/maskless-lithography/repository/43... Conclusion: it may even work. Some questions regarding the topic: What can we know about the uLED technology INL developed? I found not too much except it produces good-looking neuromorphic spiking behavior at very low current densities... What are the key parameters (wavelength, optical power output, resolution, defect density, uniformity, WPE)? Is this data public, or INL handles it proprietary? What about IP things (patents by INL, etc)? JBD's display technology is proprietary and patent-encumbered. What aspects does it have on adapting it as the basis of our stepper? What INL (or their government) will do if they realize it can be used not only as a display? Regards, Ferenc On Wed, Nov 18, 2020 at 12:29 PM Pavel Nikulin <pavel@noa-labs.com> wrote:
Their 10k DPI prototype 5000x4000 https://www.youtube.com/watch?v=52ogQS6QKxc _______________________________________________ Libresilicon-developers mailing list Libresilicon-developers@list.libresilicon.com https://list.libresilicon.com/mailman/listinfo/libresilicon-developers
Hi Ferenc
I did some paper-pencil calculations on what we know about these displays. I put it here: https://redmine.libresilicon.com/projects/maskless-lithography/repository/43 /revisions/master/entry/JBD_uLED.txt Conclusion: it may even work. Fantastic work! Well done!
Some questions regarding the topic:
What can we know about the uLED technology INL developed? I found not too much except it produces good-looking neuromorphic spiking behavior at very low current densities... What are the key parameters (wavelength, optical power output, resolution, defect density, uniformity, WPE)? Is this data public, or INL handles it proprietary? What about IP things (patents by INL, etc)? It's infrared they're generating, not UV light, unfortunately, so if we could use the uLED displays from JBD we would have a head start. They're hardening polymers with a laser and use them as a wave guide for light in the infrared spectrum.
JBD's display technology is proprietary and patent-encumbered. What aspects does it have on adapting it as the basis of our stepper? What INL (or their government) will do if they realize it can be used not only as a display? Considering that JBD is a Chinese company, not a European one, based on my past experiences, they might make the uLED display way too expensive for us to be competitive and might start developing and selling their own steppers, which will suck and their business attempt will fail. I'm much less worried about the government, when it comes to Chinese companies, they're not the same maniacs like the ones in Brussels right now trying to ban end to end encryption. Haha When it comes to INL, as well as when it comes to JBD, we first have to do our homework and select the most suitable component, after that we will have to do some guanxi building and convince them that it's better to work together and cooperate instead of trying to fuck each other over. Building up loyalty among partners is an ancient old Chinese tradition, so is fucking each other over BTW :D
Cheers -lev
Hi all, thats very good news, so no need for dlp (mems mirrors) and mechanics. " Technical problems to be solved with this arrangement are: a) The imaging unit is expected to generate considerable amount of heat (6.25cm2 with 1300mW/cm2 intensity output and 2.7% WPE is approx. 300W power consumption, most of which is dissipated), resulting in considerable thermal expansion, that needs to be managed (cooling, or using low-LCTE materials). b) Power supply and data connections need to be implemented without jeopardizing mechanical compatibility. 6. Conclusion and open points The use of JBD's AMuLED display as maskless lithography pattern source is not infeasible outright. Points to be further evaluated: - Effect of incoherent illumination on projection optics - Evaluation on JBD side if they want to develop a 2.5x2.5cm unit for us... - ... and How Much Does It Cost? - Defect density - mitigation or enhancement - Feasiblity analysis of the proposed integration on INL/LS side - Thermal management and electrical connection " CHIPCOOLER: Here I would like to suggest to add a aluminium or copper plate to the backside of the display-chip. The plate has small etched trenches, and is covered by another plate without trenches. Both plates are glued together or friction welded together in a way plate heat exchangers are manufactured. Pressurized water/salt mixture at -10C is pumped through the trenches to cool the chip in order to reduce expansion. A compressor based freezer cools the liquid and a high pressure pump (gear pump) will provide for a continuous flow without high pressure variations which would cause inaccuracy. Also the pump driven by a strong stepper motor can be modulated to run only in times when the display is switched off, so you get a duty cycle of operation and cooling. The mass of the coolant and the metal can absorb heat pulses. --- Cheers, Ludwig On 9/14/20, David Lanzendörfer <leviathan@libresilicon.com> wrote:
Hi folks So on Wednesday, 10 am Portuguese time, I'm having a ZOOM conference with the other folks of the Photonics lab at INL, where I'll be showing a presentation I'm right now tinkering together. The goal is to use LibreSilicon in combination with their Integrated Photonics, in order to build neuromorphic chips. By becoming part of Jana's research project (she's a professor for photonics
at INL), she and I can make LibreSilicon part of the university projects which would make it subject to direct EU funding. Just a heads up.
Cheers -lev
On Fri, Nov 20, 2020 at 2:11 PM ludwig jaffe <ludwig.jaffe@gmail.com> wrote:
- Effect of incoherent illumination on projection optics
I want to note that I-line mercury lamps were incoherent, and worked just fine before the industry switched to excimer lasers. I have doubts if effect on quality at such power levels, and resolutions is a thing. A 1µm process should be very viable for things like smart interposers, or other backend business. I'd say it should have an even higher bearing on things like WLCSP because you eliminate the mask shop from the loop every time you need to make a package modification, which can go up to 100+ for most popular chips.
Hello Everyone, Regarding coherence: I digged a bit deeper into the topic. Unfortunately, it turns out that coherence and monochromaticity indeed matter. Light source in I-line and G-line steppers is usually mercury vapor discharge tube, that is polychromatic and incoherent. However, polychromaticity results in dispersion in lens material and chromatic aberration, which reduces modulation index and usable resolution significantly. Also, incoherent illumination (i.e. light source with nonzero size) results in the existence of plane wave components in pre-reticle illumination propagating with an offset angle to the optical axis. After diffraction on the reticle, higher order diffraction modes of these off-axis components would not be captured by the projection optics, resulting in incomplete image reconstruction (reduced spatial bandwidth, "blurring") at the wafer level, further reducing modulation and resolution. To counter this, illumination systems in steppers contain a narrow-band filter (Bragg-filter or similar) to filter out exactly one narrow spectral line (hence I-line and G-line), and additional optics to eliminate off-axis components and increase coherence (therefore, what reaches the reticle is more or less "laser-like", highly coherent and monochromatic radiation with very narrow FWHM). Also, the projection optics in the stepper is usually a "narrow-band" system in terms of wavelength due to dispersion, and fine-tuned to work only at the wavelength of the line it is specified for. The micro-LEDs in the JBD display, as are all other LEDs, are polychromatic (the FWHM of the one I considered in the calculation is 15nm), and it also can be assumed that coherence is not too good, too (as high coherence would mean near-zero viewing angle, which is a problem for a display). In addition, the center wavelength of the display falls half-way between I-line and G-line. In my opinion, coherence may be improved by using micro-optics at each micro-LED that produce highly collimated beams (JBD patents 10304375 and 9977152 describe microlenses and microreflectors, I don't know if they are really capable of and committed to doing this or it is just "shelling-patenting"). The wavelength of the emitters can be fine-tuned to match the nominal wavelength of the projection optics (GaAs/InGaAs LEDs are tunable to some degree by changing the Ga:In ratio). However, the effects of residual incoherence and of the 15nm polychromaticity need to be evaluated further, which is beyond my level of competence, and possibly requires the detailed knowledge of the actual projection system and/or fiddling around with one. Regards, Ferenc On Fri, Nov 20, 2020 at 12:28 PM Pavel Nikulin <pavel@noa-labs.com> wrote:
On Fri, Nov 20, 2020 at 2:11 PM ludwig jaffe <ludwig.jaffe@gmail.com> wrote:
- Effect of incoherent illumination on projection optics
I want to note that I-line mercury lamps were incoherent, and worked just fine before the industry switched to excimer lasers.
I have doubts if effect on quality at such power levels, and resolutions is a thing.
A 1µm process should be very viable for things like smart interposers, or other backend business. I'd say it should have an even higher bearing on things like WLCSP because you eliminate the mask shop from the loop every time you need to make a package modification, which can go up to 100+ for most popular chips. _______________________________________________ Libresilicon-developers mailing list Libresilicon-developers@list.libresilicon.com https://list.libresilicon.com/mailman/listinfo/libresilicon-developers
Éger Ferenc schreef op vr 11-12-2020 om 22:34 [+0100]:
To counter this, illumination systems in steppers contain a narrow- band filter (Bragg-filter or similar) to filter out exactly one narrow spectral line (hence I-line and G-line), and additional optics to eliminate off-axis components and increase coherence (therefore, what reaches the reticle is more or less "laser-like", highly coherent and monochromatic radiation with very narrow FWHM). Also, the projection optics in the stepper is usually a "narrow-band" system in terms of wavelength due to dispersion, and fine-tuned to work only at the wavelength of the line it is specified for.
It is true that old steppers contain spectral line filters; more recent steppers use monochromatic lasers. But what in lithography is actually done is to use off-axis illumination for resolution enhancement. In the extreme one can reach double the resolution over coherent illumination (0.25*λ/NA versus 0.5*λ/NA). More info on off-axis illumination: http://www.lithoguru.com/scientist/litho_tutor/TUTOR42%20(Aug%2003).pdf Off-axis illumination can be implemented by a second lens system before the light reaches the reticle where a pupil plane is present where one can insert the shape of the off-axis illumination one wants. Actual scanners from ASML (which I am familiar with) use more complex systems with so-called diffractive optical elements to optimize for other effects like lens aberrations, light intensity uniformity, minize effect of temperature expansion of materials, etc. greets, Staf.
Hello Everyone, I recently elaborated further on the optical considerations of the uLED reticle topic. I put the results into the maskless litho repo as usual: https://redmine.libresilicon.com/projects/maskless-lithography/repository/43... Please find errors in it... I plan to prepare a thermomechanical/thermohydraulic FEM simulation also, to study possible implementations of cooling. Regards, Ferenc Éger On 12/12/2020 00:29, Staf Verhaegen wrote:
Éger Ferenc schreef op vr 11-12-2020 om 22:34 [+0100]:
To counter this, illumination systems in steppers contain a narrow-band filter (Bragg-filter or similar) to filter out exactly one narrow spectral line (hence I-line and G-line), and additional optics to eliminate off-axis components and increase coherence (therefore, what reaches the reticle is more or less "laser-like", highly coherent and monochromatic radiation with very narrow FWHM). Also, the projection optics in the stepper is usually a "narrow-band" system in terms of wavelength due to dispersion, and fine-tuned to work only at the wavelength of the line it is specified for.
It is true that old steppers contain spectral line filters; more recent steppers use monochromatic lasers. But what in lithography is actually done is to use off-axis illumination for resolution enhancement. In the extreme one can reach double the resolution over coherent illumination (0.25*λ/NA versus 0.5*λ/NA). More info on off-axis illumination: http://www.lithoguru.com/scientist/litho_tutor/TUTOR42%20(Aug%2003).pdf Off-axis illumination can be implemented by a second lens system before the light reaches the reticle where a pupil plane is present where one can insert the shape of the off-axis illumination one wants. Actual scanners from ASML (which I am familiar with) use more complex systems with so-called diffractive optical elements to optimize for other effects like lens aberrations, light intensity uniformity, minize effect of temperature expansion of materials, etc.
greets, Staf.
_______________________________________________ Libresilicon-developers mailing list Libresilicon-developers@list.libresilicon.com https://list.libresilicon.com/mailman/listinfo/libresilicon-developers
Ferenc Éger schreef op vr 18-12-2020 om 02:50 [+0100]:
Hello Everyone,
I recently elaborated further on the optical considerations of the uLED reticle topic. I put the results into the maskless litho repo as usual:
https://redmine.libresilicon.com/projects/maskless-lithography/repository/43... Please find errors in it...
Nice work, I agree that when using a LED matrix array it corresponds with handling each point as independent light source (this contrary to the use of micro-mirrors where off-axis would still be possible). It thus corresponds to optimization of the optics for what in lithography is called isolated features. What does stay the same is that optimization of the lens NA is a trade-off between DOF (depth-of-focus) and resolution + sensitivity to light intensity variation. The light intensity variation is caused by difference in intensity between different LEDs, the variation in intensity of a single LED over time and the non-uniform intensity over the field of the lens system. The first could in theory be corrected by varying the on-time of different LEDs although then the resolution in time has to be higher than the total 'amount' of the light in the minimum period. The focus variation is determined by the quality of your leveling system, the flatness of the top surface you want to image on and the non-uniformity of focus over the field of the lens system. In lithography this is verified experimentally by looking at so called focus-exposure (FE) matrices. This optimization can be done on a built system although money can be saved by elimating the need for high-NA from the start. The cost of lens sytem increases with increasing field size and increasing NA. greets, Staf.
Hello Everyone, The concept of liquid cooling may work, but three things need to be considered: - Workplace-safety managers of fabs may freak out on using conductive saline solution in a mains-powered equipment (sealing failure may result in shock hazard) - Yet more freakout may come from why do we want to introduce sodium-rich coolant into the cleanroom (sodium is a potent contaminant) - Tubing must be made in such way not to compromise compatibility to existing equipment (as the doc states, the idea is to make our "self-emissive programmable photomask" useable on existing equipment without modifications, so regular masks and SEPP can be swapped in-and-out) Based on it, I recommend using DI water, possibly with glycol if subzero temperature is needed, as coolant medium. Regards, Ferenc On Fri, Nov 20, 2020 at 9:11 AM ludwig jaffe <ludwig.jaffe@gmail.com> wrote:
Hi all,
thats very good news, so no need for dlp (mems mirrors) and mechanics.
" Technical problems to be solved with this arrangement are:
a) The imaging unit is expected to generate considerable amount of heat (6.25cm2 with 1300mW/cm2 intensity output and 2.7% WPE is approx. 300W power consumption, most of which is dissipated), resulting in considerable thermal expansion, that needs to be managed (cooling, or using low-LCTE materials).
b) Power supply and data connections need to be implemented without jeopardizing mechanical compatibility.
6. Conclusion and open points
The use of JBD's AMuLED display as maskless lithography pattern source is not infeasible outright.
Points to be further evaluated:
- Effect of incoherent illumination on projection optics
- Evaluation on JBD side if they want to develop a 2.5x2.5cm unit for us...
- ... and How Much Does It Cost?
- Defect density - mitigation or enhancement
- Feasiblity analysis of the proposed integration on INL/LS side
- Thermal management and electrical connection
"
CHIPCOOLER:
Here I would like to suggest to add a aluminium or copper plate to the backside of the display-chip. The plate has small etched trenches, and is covered by another plate without trenches. Both plates are glued together or friction welded together in a way plate heat exchangers are manufactured.
Pressurized water/salt mixture at -10C is pumped through the trenches to cool the chip in order to reduce expansion. A compressor based freezer cools the liquid and a high pressure pump (gear pump) will provide for a continuous flow without high pressure variations which would cause inaccuracy. Also the pump driven by a strong stepper motor can be modulated to run only in times when the display is switched off, so you get a duty cycle of operation and cooling. The mass of the coolant and the metal can absorb heat pulses.
---
Cheers,
Ludwig
On 9/14/20, David Lanzendörfer <leviathan@libresilicon.com> wrote:
Hi folks So on Wednesday, 10 am Portuguese time, I'm having a ZOOM conference with the other folks of the Photonics lab at INL, where I'll be showing a presentation I'm right now tinkering together. The goal is to use LibreSilicon in combination with their Integrated Photonics, in order to build neuromorphic chips. By becoming part of Jana's research project (she's a professor for photonics
at INL), she and I can make LibreSilicon part of the university projects which would make it subject to direct EU funding. Just a heads up.
Cheers -lev
Libresilicon-developers mailing list Libresilicon-developers@list.libresilicon.com https://list.libresilicon.com/mailman/listinfo/libresilicon-developers
participants (6)
-
David Lanzendörfer -
Ferenc Éger -
ludwig jaffe -
Pavel Nikulin -
Staf Verhaegen -
Éger Ferenc