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Merck Has Completed the Development of Organic Material Samples for Low Dielectric Constant TFE Below 2.5 [2022 Second Half OLED Seminar]

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Touch of flexible OLED for smartphones is divided into add-on and on-cell. Add-on is a method in which a touch electrode is formed on the top of the film and the touch film is adhered to the top of the encapsulation layer through OCA.

On-cell is a method in which touch electrodes are created directly on the encapsulation layer, and is a mainstream technology applied to Samsung Electronics’ “Galaxy” series and Apple’s “iPhone” series.

The on-cell method reduces material costs because it creates electrodes directly without using films and OCA, while the absence of films and OCA shortens the distance between touch electrodes and TFT, increasing signal-to-noise (SNR).

Merck, Low-K Organic Materials for TFE(Second half of 2022 OLED Seminar)

Merck, Low-K Organic Materials for TFE(Second half of 2022 OLED Seminar)

At the “2022 Second Half OLED Seminar” held at the FKI Hall in Yeouido on November 9, 2022, Merck announced that it is developing a low dielectric constant organic material for TFE to reduce SNR and is currently developing a 3.1 dielectric constant value for TFE to below 2.5.

Merck noted that blocking noise from TFTs is ultimately the role of organic matter, which occupies the thickest part of TFE, and revealed that it has developed a sample material available in the N2 environment.

Lastly, Merck concluded its presentation on organic materials for TFE, saying that the lower dielectric constant of organic materials can affect reliability due to lower membrane density, but that reliability has been secured in the Lab environment, and that they will secure reliability in mass production through cooperation with panel companies.

Merck, Low-K Organic Materials for TFE(Second half of 2022 OLED Seminar)

Merck, Low-K Organic Materials for TFE(Second half of 2022 OLED Seminar)

▶ 2022 OLED Emitting Material Report Sample Download

A fabrication of large area OLED TV gets possible by FMM process. DAWONSIS, develops downward deposition method by joule heating.

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It is expected that large area OLED panel pixel formation technology, which is possible only using solution based and SMS(Small mask scanning) so far, gets possible using FMM process.

DAWONSIS developed the technology downward deposition method by joule heating, to make mass production of large area display panel possible and to enhance efficiency of material usage more than two times.

Joule heating deposition is the technology that if one induces voltage in conductive film, due to resistance, it can increase surface temperature rapidly only with low energy, so evaporate organic materials films formed on conductive film rapidly only with low energy.

DAWONSIS evaporation technology key concept is followed by:

One forms organic material films on source substrates, and deposits the organic material films on panel positioned at down side whole at a time by using Joule heating.

According to DAWONSIS, it is said that

“Compared to point source or linear source, used in conventional deposition process, Joule heating deposition process is very fast deposition rate, more than 100 A/s, due to the use of area source. The efficiency of material usage is about 70~80%, more than two times efficient than conventional method, also downward deposition is applicable to large area FMM process, verification experiment results show that shadow effect dimension is 4um, which enables high resolution process. Therefore JIES evaporation equipment can be an innovative solution to fabricate large area OLED panel. ”

In conventional OLED TV, due to FMM’s deflection, it has had a problem to fabricate it as RGB method. So OLED TV panel on production line, adopts white OLED + color filter method using open mask

In order to make OLED TV by using RGB method, solution process can be also strong candidate.

But lack of efficiency of soluble luminous material and its life time, it cannot be applicable to mass production.

If one adopts the deposition technology that DAWONSIS developed, real RGB structure can be realized in OLED TV panel by using FMM process, since it uses conventional deposition materials as it is, efficiency and life time can be guaranteed. We expect that DAWONSIS’s new deposition technology can make an impact on large area OLED panel fabrication technology.