OLED (Organic Light Emitting Diodes) is a flat light emitting technology, made by placing a series of organic thin films (usually carbon based) between two conductors. When an electrical current is applied, light is emitted. OLEDs can be used to make displays and lighting, with possible applications that span TV sets, computer screens, mobile phones, decorative lighting and more. Since OLEDs emit light they do not require a backlight and so they are thinner than LCD displays, and are also more efficient, simpler to make and boast a better color contrast.

While OLED displays excel in color-contrast and efficiency compared to LCDs, they’ve also proven relatively hard to produce on a large scale. Current evaporation-based production techniques involve a lot of wasted material and risk of defects. OLEDs are also extremely sensitive to moisture and oxygen and therefore must be protected with a high performance encapsulating layer. All of these issues hinder OLEDs’ market takeover, but much work is put into resolving them.

OLED ink-jet printing

Current OLED producing methods rely on evaporation processes, in which the organic materials are deposited onto a glass sheet through a thin metal stencil, also known as a "shadow mask”. This process is problematic, as a significant amount of the material is wasted because it disperses all over the mask, in addition to inherent mask changes which expose the sheet to dust and compromise yields (OLEDs are by nature sensitive to contamination).

Inkjet OLED printing has the desirable ability to allow precision deposits without the use of a mask. It also produces less stray particles, thus boosting yields. These significant advantages make this technology interesting to many companies and virtually all OLED makers have active ink-jet printing development projects.

Inkjet methods form films by discharging the required amount of organic material onto large glass substrates in regular atmospheric conditions. This could be done, for example, by placing OLED pixels on glass or plastic using a portable platform and nozzles. Such methods have the potential to increase yields and lower prices, thus enabling OLED technology to take its deserving place in the market.



Unfortunately, OLED inkjet printing is not yet common, as printing OLED displays is a relatively challenging task for many reasons. A number of layers need to be deposited in pixels (the size of the pixels themselves is defined by the overall resolution the display will have). Being able to place the right number of drops of the active materials into the pixels is a challenge, in addition to developing a process in which the ink dries to deliver flat films of materials in the pixel.

Despite major progress, it is maintained that soluble OLED materials (required for inkjet printing) are less effective than evaporable ones. Ink-Jet printing is also not able to reach the same high densities of evaporation OLED production, which limits its applications for large-area production (TV panels) and not small mobile, VR and wearable OLEDs.

Ink Jet printing is still not used in any commercial OLED display production. But progress in past years have been rapid and some believe that initial OLED TV production using ink jet printing may begin in 1-2 years.

Latest OLED ink jet printing news

Here's Asus' 21.6" ink-jet printed OLED Monitor on video

Earlier this month Asus introduced a new OLED monitor, the 21.6" 3840x2160 (204 PPI) ProArt PQ22UC, which uses a ink-jet printed OLED panel produced by JOLED. The following video shows this new laptop which is said to have a remarkable image quality and a portable design:

Asus did not yet reveal the price of its first OLED monitor, but it did say it will ship by the spring of 2018. JOLED announced a few weeks ago that it started commercial production of 21.6" ink-jet printed 4K OLED panels. JOLED's production capacity is not large as the company is still using a pilot-scale line, but JOLED is seeking to raise $900 million to support its plan to start mass producing OLEDs in 2019.

JOLED supplies the 21.6" 4K OLEDs used by Asus in its new OLED monitor

Yesterday we posted on a new OLED monitor, the Asus ProArt PQ22UC with a 21.6" 3840x2160 (204 PPI) OLED panel. It turns out that this panel is produced by JOLED.

ASUS ProArt PQ22UC photo

This is very interesting news. JOLED indeed announced a few weeks ago that it started commercial production of 21.6" ink-jet printed 4K OLED panels, and it is great to see a product launched so quickly. JOLED's production capacity is not large, the company is still using a pilot-scale line, but it's likely that Asus is not expecting to sell many units of this high-end OLED monitor.

OLED Automotive Market Report

Denso may invest $450 million in JOLED to help it achieve OLED mass production

FOllowing JOLED's announcement that it started commercial shipments of its 21.6" 4K OLED panels for use in medical monitors in its low-volume 4.5-Gen ink-jet printing production line, it was reported that the Japanese display maker is seeking to raise $900 million to support its plan to start mass producing OLEDs in 2019.

JOLED 4K prototype OLED Monitor (July 2017, Japan)

Reuters reports today that Denso Corp (an automobile parts producers) is considering a $440 million investment in JOLED. Earlier reports from Japan claimed the JOLED received funding commitments from Sony and Panasonic, with both Sumitomo Chemical (who supplies its P-OLED materials to JOLED) and Screen Holdings (who supplies its equipment to JOLED) are likely to take part in the financing round as well. Each of these four companies will invest between $45 to $90 million.

UniJet: Ink-jet printing could reach 550 PPI for small/medium OLED production in 2020

During an OLED display Seminar in Korea, UniJet's CEO Kim Seok-Soon said that new advances in Ink-Jet printing technologies could enable displays that are over 500 PPI - and so make printing a viable technology to produce small and medium-sized OLED panels.

UniJet 2017  LED-seminar slide, 550 PPI Inkjet printing

Kim says that current ink-jet printing processes can reach to to 150 or 200 PPI, which is good enough for TV production (enough for a 8K 55" panel in fact) but not good enough for small sized displays. However current laser-droplet measurement processes could enable discharge control of less than 0.1 μm and a volume accuracy of less than 0.1% - enough to reach 550 PPI. Kim estimates that such technologies could be ready for mass production lines by 2020.

Sony, Panasonic and Sumitomo to participate in JOLED's next financing round

A few day go JOLED announced that it started commercial shipments of its 21.6" 4K OLED panels for use in medical monitors, in its low-volume 4.5-Gen ink-jet printing production line.

JOLED 4K prototype OLED Monitor (July 2017, Japan)

Following JDI's decision to halt its plans to increase its stake at JOLED, the company is now seeking to raise $900 million to support its plan to start mass producing OLEDs in 2019. According to a report from Japan the company has received commitments from Sony and Panasonic and both Sumitomo Chemical (who supplies its P-OLED materials to JOLED) and Screen Holdings (who supplies its equipment to JOLED) are likely to take part in the financing round as well.

JOLED starts commercial shipments of its printed 21.6" 4K OLED monitor panels

In June 2017 JOLED announced that it started to sample 21.6" 4K OLED panels, with plans to initiate low volume production at its 4.5-Gen pilot inkjet production line. JOLED announced today that it has began commercial shipments of these panels. We do not know JOLED's first customer but it is likely to be Sony.

JOLED first commercial 21.6'' 4K OLED panels photo

JOLED says that it has now achieved the necessary product quality and production yields. The product was already selected for use in medical monitors (again, we believe this is Sony, who we know received JOLED's first samples and already has its own 25" OLED medical monitor that uses Sony's own OLEDs). JOLED also aims to ship these panes to other OLED monitors applications.

Kateeva officially launches its R&D and pilot OLED TV ink jet printing systems, acquires a large IP portfolio

OLED ink-jet developer Kateeva made several interesting updates regarding its OLED Ink Jet printing technologies. First up, the company formally introduced its inkjet equipment for large-area RGB OLED emitter deposition. Kateeva brands its new line as YIELDJet Explore and these systems are targeted for R&D lines and pilot lines.

Kateeva YIELDJet TFE system photo

Kateeva offers two systems, the Explore, which is used for early development and small panels (up to 200 mm substrates) and the Explore Pro which can be used to produce panels up to 55" in size (this is still a development/pilot system, though). Kateeva announced that it has shipped four Explore systems in 2017, and it expects to ship three additional systems by Q2 2018.

DSCC: OLED materials to grow at a 20% CAGR to reach $2.25 billion in 2022

DSCC released a new market report which tracks the OLED materials market. According to DSCC's estimates, the OLED material revenues will reach $905 million in 2017 and will grow at a 20% CAGR to reach $2.25 billion in 2022. Note that these numbers do not include royalty payments.

OLED Materials sales forecast (DSCC 2016-2022)

DSCC sees the small/medium display materials growing at a 22% (from $586 million in 2017 to $1.56 billion in 2022) - and growing faster than OLED TV materials (CAGR 16%) as ink jet printing, which will begin to be adopted in 2020 will result in more efficient OLED deposition.

DSCC: Ink-Jet printing could lead to 17% cost reduction in 55" OLED TV production

LG Display currently produces all its OLED TV panels using an evaporation (VTE) process. Market research company DSCC says that ink-jet printing is more efficient than current VTE processes as it will result in simpler displays (no need for color filters, for example, as used by LG's current WRGB displays). Ink-Jet printing will also enjoy lower depreciation costs and lower indirect expenses such as water and electricity.

55'' OLED TV cost evaporation vs Ink-Jet (DSCC, 2017)

DSCC estimates that an ink-jet printed 55" OLED TV panel will cost 17% less to produce compared to a VTE produced panel. An ink-jet printed panel will theoretically be significantly brighter (as the color filters absorb a large portion of the light), however solution-based OLED materials have traditionally lagged behind evaporation ones (Merck though says that the latest soluble materials are on-par with evaporation ones).

OrelTech develops a low-cost low-temperature printed electronic process

OrelTech Konstantin Livanov photoOrelTech is an Israeli-based early stage company that commercializes a unique printed electronics technology based on novel conductive ink and production process.

OrelTech's Head of R&D, Konstantin Livanov, was kind enough to explain the company's technology and business. Dr. Livanov received his PhD in chemistry from Weizmann Institute of Science, and his expertise is in surface chemistry, nanomaterials, composite materials and electron microscopy.

Q: Hello Dr. Livanov, thank you for your time. First, can you explain ORELTech's process and technology?

Sure. We are doing conducive ink for advanced applications in printed electronics. The advantages of printed electronics are obvious: drastically reduced manufacturing costs due to simpler equipment, fewer fabrication steps and shorter throughput time. However, most organic devices, including OLEDs, are not printed. We could however print them if we could print metal layers at low temperatures. Right now most of them are assembled or deposited in high vacuum.