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20 billion iviles osteotic quantum dot inkjet printing for miniature LED displays
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2024-01-30
Scrona, a Swiss startup, has used its current dynamics (EHD) inkjet printing to a miniature LED display with quantum dots.
The development of Avantama combines Scrona's EHD inkjet process with the high -pattern resolution of the perovskite quantum dot (QDS) to achieve a more efficient and cost -effective micro -LED display manufacturing, which improves the purity and brightness of color.
The CEO and co -founder of Scrona Patrick Galliker told Enews EUROPE: "We have not reached the level of industrial production, but what we see is that the industry is researching color conversion and other technologies.The feasibility of the production process. "
He saw that the inkjet process was used to apply a color filter on the quantum dot constructed on the silicon wafer, and then moved it to the display panel.He said that the use of color filter to create a full -color display with rotary coating is currently a major challenge, and this is where inkjet printing or additive manufacturing can provide help, but the premise is that the speed is fast enough.
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"Basically, when we observe the number of pixels of 20 billion pixels on a 6 -inch wafer, this is a huge number. The 20KHz single -spray system takes 275 hours because it is required to deposit 38 dropletsthe height of."
Avantama perovskite quantum dot has the highest absorption coefficient in quantum dots, which allows thinner pixels with good light density.Compared with other quantum dots, the perovskite quantum point also has the highest weight -based absorption, which is directly transformed into a very high OD/thickness value.
He said: "In my opinion, there is only one method that can be manufactured by additives.""20KHz is already fast, you need to move from one pixel to another, so you need a lot of nozzle. This has been proven in the graphic, and the number of nozzles is increased by the roll -to -roll printer."
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The target is to process 60 wafers per hour, that is, a layer of wafers in one minute.He said: "This is 16,000 nozzles, and there are already in the graphics industry, so this is feasible."
Another method is to increase the frequency.When using EHD, when the valve is opened, the ink flows, so it is equivalent to multiple drops of droplets in each pulse to speed up the process.He said: "You also have the opportunity to optimize materials for these points, rather than a 10 micron -high film, which can be reduced to 5 microns. There are other opportunities to use higher viscosity materials. The solvent is usually acrylic monitors. It becomes a MicroLED structurea part of."
He said: "If you add all these together, you can produce 16 printed heads with 1,000 nozzles, which is already used in the inkjet industry."
Scrona printing head technology uses EHD inkjet printing to process QD ink, spraying liquid droplets from the nozzle through static electricity.By exposing the ink to the electric field from the outside of the nozzle, the ion was pulled to the surface of the liquid, and then it began to generate mechanical stress on the liquid.
Control the ion density on the surface by regulating the voltage intensity used to generate electric fields.The size of the droplet can be controlled by the applied voltage, including a quantitative liquid droplets smaller than the nozzle itself.
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The company has been developing a printed head with a maximum of 256 nozzles, which can expand to thousands of.The print head can also be used in parallel to achieve 20 billion quantum dots in one minute.
"We keep the number of nozzles at a lower level in order to investigate the changes between the nozzles as much as possible. We will soon start producing a higher number of nozzles in the first two quarters. There are 100 nozzles on a single chip.
"We are using digital lithography technology to make print heads on the wafer, so the size is not limited, depending on the size and spacing of the wafer. At present, we are manufactured on 4 -inch wafers. Each nozzle requires 125 microns, soThe printed head of 15mm x 6mm can provide nearly 6,000 nozzles. You need to connect space, so its 4,000 nozzles are used for packaging and contact. "
"Considering the current output, we can produce 1,000 nozzles on each chip on the MEMS side, but this is the front end. The decision time is an electronic drive, so there will be as many as 256 nozzles using ready -made inkjet equipment this year.More importantly, this will be our own CMOS design to meet our voltage and current requirements. We will financing in the next round, "he said.
The company already has a commercial printed head with five nozzles, developed by the NOTION SYSTEM, and can be upgraded to 8 nozzles in the same area.Later this year, the company plans to release the third -generation print head, covering a area of 64 to 256.
He said: "We are building an automated assembly. For Gen3, we have the working prototype of an integrated chip, and now we can work."
Avantama co-founder and Dr. CTO Norman Lüchinger said: "Traditional inkjet printing is not a feasible choice for the emerging MicroLED display because the pixels they use are much smaller than the QD-OLED display."
"Through cooperation with Scrona, we can prove that when the thickness of the illegitimate qim QD layer is lower than 2µm, we can get OD greater than 1.The overall efficiency of MicroLED display technology and the time of production. "
