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>> OLED panel printed OLED popularization key step 6th,Dec,2017
LG and Samsung to invest in building "printed OLED" panel demonstration lines in 2017. If this plan is put in place, this will be a crucial step towards mass adoption of OLEDs ...
But wait! Why did you come out with a new thing called "printing OLED"? Is this a new display technology? Over the past 5 years, OLED "is coming" declaration has heard ear long cocoon it! Can we still believe this news? And with the new technology, the original production line, and now the construction of the production line, how to deal with it?
Too many problems! However, let's look at what the latest news has to say: According to Korean media reports, Samsung Display and LG Display are preparing for joint ventures with facilities such as Kateeva, Tokyo Electron, and Merck, Idemitsu Kosan and other material suppliers, each introducing inkjet printing processes on the A3 and M2 lines. The schedule is 2017.
Among them, the Samsung A3 production line is the 6th generation line, the target product is a flexible OLED, the size of the substrate into the substrate 15,000; LG M2 line is 8.5 generations of lines, the target product rigid OLED, the current technology is white oled + color filter, full steam Ferry, the size of the monthly basis of 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 currently the most advanced flat panel display panel production line!
According to media reports, Mitsubishi Chemical has provided samples of "OLED materials" for inkjet printing to several potential users in the first half of this year. Poly TCL, the leading TCL in China, also signed a printed display material product Cooperation agreement.
In summary, it seems that "printing" + "OLED" has become the "core direction" for the technological progress of the next-generation flat panel display in the first half of this year. However, I believe many people have a question: Now that there has been an increase from small to large OLED production technology, why the printing technology is still so popular? There are four reasons for this:
First, printing is a low-cost way. Just OLED material itself, using the printing process than the current steaming process to save 90%.
Secondly, although the steaming process solves the problem of the entire steaming from the 3rd generation to the 8.5th generation, the RGB three primary color steaming can not be realized on the large size. The existing 8.5-generation line steaming process, used in the RGB color OLED panel manufacturing, the yield dropped significantly.
Third, the effect of the two processes of vapor deposition and inkjet printing on the life characteristics of OLED materials is significantly different, which is beneficial to the long-life OLED display products. Life is important for large size applications.
Fourthly, the current trend in the panel industry is to focus on the large-sized lines, that is, the new investment lines basically start from the 6th generation line, which makes the steam transfer process more conducive to the lower generation lines encountering the problem of "upgrading" The printing technology is more suitable for high-generation line use.
These reasons together, enough to make printing OLED become the trend of the times. However, the biggest bottleneck in printing OLEDs is the differential control of each tiny print dot, as well as the development of devices for the printing of extremely small sub-pixel units. The former is the key bottleneck in the entire printing display industry, the latter is mainly for small and medium sized display products in terms of the problem. - Or, for printing OLEDs, ink stability is not final
Big problem, equipment accuracy and stability is the real test. The latter, precisely, must be effectively eliminated from engineering after the demonstration production line is established.
"To solve the problem of printing accuracy and process stability in specific engineering practice under large-scale conditions" - this is the real bottleneck of OLED printing display at present. This is also the Samsung, LG, poly printing and other enterprises are under the greatest efforts to solve the problem.
This problem is solved? Someone must ask this question However, in contrast, the problems encountered in the manufacture of large-size OLED panels by the steam-evaporating technology can also be summarized as "accuracy and process stability." Or, printing OLED and evaporating OLED, the core problem after the large size is the same - who can win the future, depending on the kind of technical route easier to solve this problem.
In other words, OLED printing technology in 2016, the essence can be understood as: large-size transmited OLED a little more than the imagination of the difficulty, so we choose another way - printing OLED to try it. However, this is a big impact on color TV. For mobile phone OLED, there is no printing technology, will not cause the process of industrial popularization change.
"Do not be happy too early!" Because of the OLED, the consumer is getting too many pigeons. From 2012 onwards, Samsung, LG's "OLED TV is coming" Connaught has repeatedly postponed.
The reason for this is not that manufacturers do not work hard, but because of "too many choices", they are distracted and the technical difficulties are greater. These factors combine to create a "Samsung, LG" continued to eat.
From a technical point of view, Samsung's earliest route is "low-temperature polysilicon, steam transition, RGB OLED." However, the fact is that it is difficult to enlarge the size of a low-temperature polysilicon TFT, and the size of a vapor-deposition process is not too difficult. Large size of the RGB OLED is now almost impossible to achieve economically. Later, Samsung has proposed a "laser thermal transfer" printing OLED, but did not ultimately succeed. To LG smart, using a metal oxide TFT + half steamed + WOLED + color filter line. This route bypassed a few of the most difficult to cut, such as RGB technology, the first to introduce large-scale production of products.
These technical analysis, we can see the OLED roadmap is not easy: TFT glass substrate, the difference between the flexible substrate, low temperature polysilicon and metal oxide two major technical routes; OLED coating with a half steamed, full steaming , Laser thermal transfer, inkjet printing at least four technologies; the final product selection also has two major differences WOLED + color filter and RGB OLED.
So, the conclusion is: too many options are possible, which increases the likelihood of a wrong direction. This is OLED has lagged behind the key "opportunity risk." If at first the entire industry, all the power resources are concentrated in the ink-jet RGB OLED, maybe the whole industry process can be much faster.
The next generation flat panel display in 2016 the best news - manufacturers finally think that "inkjet printing" is the most critical process point, even the electroluminescent QLED, Samsung was used to "anti-OLED" technology, Must be based on the "inkjet printing" process. Once the OLED, QLED display industry, this unprecedented consensus on the "inkjet printing" formation, then, OLED acceleration will be possible.
Although the difficulties are relatively large, the industry has reached an all-time consensus and a total force point, and many industry efforts over the years have made OLED materials, OLED ink formulations, TFT materials and other key links have been "quite mature" This is the biggest good news for the OLED industry.
Here, the article basically ended, but at the beginning of a question you also need to add replies: OLED printing, the existing OLED lines and in-line how to do?
First of all, the small and medium size line, there is no need to import the needs of the printing process, the steam is now used well, built to continue to use just fine; Second, the construction of production lines, large size line only LG's 9th generation line, This line is to be mass-produced by 2018, that is, his technical roadmap can be printed after the OLED line test in 2017 is confirmed after the M2 line test. Third, other small and medium size under-built lines can be scientifically adjusted according to the demonstration results of LG and Samsung; Fourth, steamed the intersection of OLED and the intersection of line and the intersection of printing and the intersection of OLED and the intersection of printing line and difficulty of printing a little not big, the intersection of cost and problem mainly; Fifth, already large-scale OLED line of mass production only LG M1, M2, Converted into a printing line costs acceptable.
Therefore, we do not need to worry too much about the impact of new technologies on existing OLED lines. Because before OLED is really going is not far away, even if all returned to go back, is not a big problem. And the transition part in the OLED panel equipment accounted for less than three percent.
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