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>> OLED panel printing out of OLED popular key step 16th,Aug,2017
LG and Samsung in 2017 to invest in the construction of "printed OLED" panel demonstration line. If this plan is implemented, it will be a key step towards large-scale adoption of OLEDs ...
But wait! Why is it out of a new thing called "printing OLED"? Is this a new display technology? Over the past five years, OLED "will come," the declaration has been heard ears long cocoon! Can we still believe this news? And with the new technology, the original production line, is now building the production line, how to deal with it?
Too much problem! (Samsung Display) and LG Display (LG Display) prepared with the Kateeva, Tokyo Electric (Tokyo Electron) and other equipment factory, according to the Korean media reports, and then we look at the latest news to say what: Merck, Idemitsu Kosan, and other materials, each in the A3 and M2 production line to introduce inkjet printing process. The timetable is 2017 years.
Among them, the Samsung A3 production line is 6 on behalf of the line, the target product is a flexible OLED, the scale for the monthly input of 1.5 million; LG M2 line is 8.5 on behalf of the line, the target product rigid OLED, the current technology is white oled + color filter, Crossing, the size of the base board for the 26,000. Samsung A3 is the world's first pure flexible OLED line, the main mobile phone and other small and medium size applications and RGB oled products; LG M2 is the world's first large-size OLED production line, the main TV and other large-size applications. - these two lines are the most advanced flat panel display panel production line!
According to media reports, Mitsubishi Chemical has in the first half of this year to several potential users with inkjet printing for the "OLED material" samples; domestic TCL-led poly-printing and the German Merck signed a printed display material products Cooperation agreement.
In summary, it seems that "printing" + "OLED" has become the first half of the new generation of flat panel display technology progress "core direction." However, I believe many people have a question: now there have been from large to small OLED production technology, why printing technology is also so popular? In this regard, there are four reasons:
First, printing is a low cost way. Only the OLED material itself, using the printing process than the current steaming process to save 90%.
Secondly, the steaming process, although the solution from the 3 generation line to 8.5 on behalf of the line of the whole steam crossing the problem, but in large size can not achieve RGB three primary colors triple steam. The existing 8.5-generation line steaming process, in the RGB OLED three primary color panel manufacturing, the yield dropped significantly.
Third, the two effects of steaming and inkjet printing on the life characteristics of OLED material significantly different, which is conducive to longevity OLED display products. Life is very important for large-size applications.
Fourth, the current trend of the panel industry is to focus on large-scale line, that is, the new investment line to the basic 6-generation line as the starting standard, which makes more conducive to the low generation line of the steaming process, suffered a "upgrade" While the printing technology is more suitable for high-generation lines.
These reasons together, enough to make printing OLED become the trend of the times. However, the biggest bottleneck in printed OLEDs - the differential control between each tiny print point, and the development of equipment for minimal sub-pixel unit printing. The former is the printing industry's key bottleneck, the latter is mainly for small and medium size display products in terms of the problem. - or, for printed OLEDs, ink stability is not final
Big problem, equipment accuracy and stability is the real test. While the latter, it is necessary to establish an exemplary production line can be really resolved from the project out.
"To solve the specific engineering practice, large-scale conditions of the printing accuracy and process stability issues" - this is the current OLED printing display the real bottleneck. This is also Samsung, LG, Polyhua printing and other enterprises are under the greatest effort to solve the problem.
Is this problem solved? Certainly someone asked that. However, in contrast, the problems encountered in the manufacture of large-size OLED panels can be summarized as "accuracy and process stability". In other words, printing OLEDs and steamed OLEDs, after the big size of the core problem is consistent - the future who can win, depending on the kind of technical route easier to solve this problem.
In other words, 2016 OLED printing technology heat, the essence can be understood as: steamed large size OLED a bit beyond the imagination of the difficulty, so we choose another way - printing OLED to try it. However, this is the impact of relatively large color TV. For the mobile phone OLED, there is no printing technology, will not cause the industry to change the process of popularization.
"Do not be happy too early"! Because OLED this thing, the consumer was put too many times the number of pigeons. From 2012 onwards, Samsung, LG's "OLED TV to the" Connaught has repeatedly postponed.
This is the reason, not manufacturers do not work, but because "choose too much", energy dispersion, while technical difficulties and relatively large. These factors combine to create a "Samsung, LG" continued.
From a technical point of view, Samsung's first favorite route is "low temperature polysilicon, steamed, RGB OLED". However, the fact is that low-temperature polysilicon TFT large size difficult, large-scale difficulty of the steaming process is not small, RGB OLED steaming large-scale, now almost difficult to achieve the economic yield. Later, Samsung has put forward the "laser thermal transfer" printing OLED, but also did not finally succeed. To the LG smart, using a metal oxide TFT + half of the steam + WOLED + color filter film line. This route bypassed the hardest cut, such as RGB technology, the first to launch a large-scale production of products.
These technical analysis, we can see the OLED road map is not easy: TFT on the glass substrate, the difference between flexible substrates, low-temperature polysilicon and metal oxide two technical routes; OLED coating with half of the steaming, , Laser thermal transfer, inkjet printing at least four technologies; final product selection also has WOLED + color filter and RGB OLED two major differences.
So, the conclusion is: the possibility of too many choices, which led to the possibility of the wrong direction also increased. This is the key to the urgency of OLED "opportunity risk". If the beginning of the entire industry, all the power resources are concentrated in the inkjet RGB OLED, perhaps the whole industry process can be much faster.
2016 next generation flat panel shows the best news - manufacturers finally really think that "inkjet printing" is the most critical point, even if the electroluminescence QLED, this Samsung is used to "anti-OLED" technology, Must be based on the "inkjet printing" process. Once the OLED, QLED display industry, this on the "inkjet printing" unprecedented consensus formation, then, OLED acceleration will become possible.
"The difficulties are relatively large," but "the industry has an unprecedented consensus" and a total of force, and years of industry efforts to make OLED materials, OLED ink formulations, TFT process materials and other key links have been "quite mature" This is the OLED industry's biggest good news.
Here, the article basically ended, but the beginning of a question also need to add answer: printed OLED to the existing OLED line and in the construction line how to do?
First, the small and medium-sized lines, and there is no need to import the printing process needs, steaming is now also used very well, built to continue to use just fine; Second, under construction line, large size line only LG 9 on behalf of the line, This line to 2018 mass production, that is, his technical road map can be printed in the 2017 OLED test in the M2 line to determine; third, other small and medium-sized lines under construction can refer to LG, Samsung's scientific results of the demonstration; Fourth, has been mass production of large-size OLED line only LG's M1, M2, the size of the two lines are not large, the size of the line is not large, The cost of converting to print lines is acceptable.
Therefore, we do not need to worry about the impact of new technology on both existing OLED lines. Because after the OLED is really not far away, even if the return to re-go, nor is it a big problem. And the ferry links in the OLED panel equipment accounted for less than three percent.
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