Article last updated on: Aug 21, 2021

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 are used to make displays and lighting panels. OLEDs today are widely used in TVs, smartphones, tablets, laptops and wearables.

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.

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.



For many years, companies all over the world invested heavily in inkjet printing processes for OLED displays, but the process is not yet common, as printing OLED displays is a relatively challenging task, and soluble OLED materials 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.

Printed OLED panels on the market

One area in which inkjet printing is common in the OLED production process is the encapsulation layer deposition. Almost all OLEDs that adopt TFE encapsulation use inkjet printing to deposit the organic elements.

LG UltraFine OLED Pro photo

LG 32EP950 OLED monitor (31" 4K printed OLED panel by JOLED)

For actual OLED emitter layers deposition, currently the only company that commercially uses ink-jet printing is Japan's JOLED, who in 2021 started printing OLED display panels in its 5.5-Gen production line in Nomi, Ishikawa Prefecture, Japan.

The latest OLED ink jet news:

OLED innovation in Poland - 2022 status and future plans

Poland is aiming to become a major innovation and high-tech hub, and the country is already enjoying a growing industry, focusing on IT, bio-technology, robotics and nanotechnology.

Poland has a strong material science and development expertise, and in recent years we have been seeing OLED and display-related ventures out of Poland. It seems Poland is poised to become an interesting location to watch for future innovation in the OLED industry.

Ergis noDiffusion QD barrier image

Ergis Group noDiffusion OLED encapsulation film

One such company is the Poland-based Ergis Group, a leader in plastic processing active in markets such as food packaging, industrial, automotive, medical and more. In 2020, Ergis launched its first product for the optoelectronic applications (such as the display market and photovoltaics) - the Ergis noDiffusion films for flexible OLED panels (both displays and lighting) and OPVs. Ergis is using a unique ALD-based technology that enables it to offer high performance films on low cost PET films.

Notion Systems installs an inkjet printing system at ITRI for OLED and QLED R&D

Notion Systems, a leading solution provider for industrial inkjet systems, announced that it had successfully installed an n.jet display system at Taiwan's Industrial Technology Research Institute (ITRI). The n.jet display system was developed in collaboration with MBRAUN/Germany and includes a fully integrated inert glove box solution that combines compact design with minimized nitrogen consumption.

Notion Systems n.jet display system photo

ITRI is now using the new n.jet display system to research and develop novel OLED and QLED technologies. ITRI has developed many OLED technologies over the years, and it is now looking to replace vapor deposition and vacuum coating with inkjet printing which could reduce the number of steps, increase material utilization and increase display quality.

Will Samsung adopt Kateeva's inkjet printers in its next QD-OLED production line?

In 2020 Samsung decided to use inkjet printers made by Korea's Semes, in its QD-OLED production lines. This created a major problem for Kateeva which hoped to win that account, which resulted in massive layoffs including some of its executives. These inkjet printers are used to deposit the QD layer in Samsung's QD-OLED panels.

Kateeva YIELDJet TFE system photo

According to new reports from Korea, Samsung has decided to change course, and rely on Kateeva's inkjet printers in its 2nd QD-OLED production line (the SDC 98.5-Gen Q-2). The reports suggests that the Semes printers do not perform as well as Samsung hopes, and these also cost more than Kateeva's printers (but Semes is affiliated with Samsung, which helped it to get the orders).

Unijet supplies OLED microdisplay TFE inkjet deposition systems for Sidtek

According to reports from Korea, Unijet has supplied China-based Sidtek with inkjet printing systems, used for thin-film encapsulation (TFE) deposition of OLED microdisplays. This is Unijet's first sell of a commercial TFE printing system.

Unijet OLED TFE inkjet printing deposition system photo

Sidtek, established in 2016, is now producing 0.39" XGA OLED microdisplays, which are available on the OLED marketplace. Sidtek's 0.39" display is available in a color version (1,000 nits) or a monochrome one.

TCL shows a 14-inch inkjet-printed rollable OLED display

Yesterday we reported that during its DTC 2021 conference, TCL demonstrated a 65" inkjet-printed 8K OLED panel co-developed by TCL's CSoT and JOLED. During the conference, the company also unveiled another panel a rollable OLED.

TCL-CSoT 14'' inkjet-printed rollable OLED prototype (DTC 2021)

This is a 14" inkjet printed OLED panel, produced using an inkjet printing process. TCL says that it has a rolling radius of <20 mm, and has been tested for up to 100,000 cycles. The panel include a built-in AI-powered compensation algorithm (we don't have more info on that). The display has been developed by CSoT in collaboration with JOLED.

Interview with Dr. Michael Doran, CEO & Founder at Notion Systems

Notion Systems is a leading supplier of industrial ink jet printing systems. The n.jet inkjet platform from Notion Systems is used to produce printed circuit boards, OLED & QLED displays, sensors and high-quality 3D parts.

Notion Systems – n.jet display photo

We present the following interview with the Company's CEO and founder, Dr. Michael Doran.

Q: Hello Michael. Can you detail notion systems' offering for the OLED industry? We understand you offer R&D and production systems, for both RBG printing and TFE printing.

Notion Systems offers a system platform called n.jet display series that prints functional layers at various steps of display production and for a range of display technologies. These include rigid, flexible, OLED, QLED and micro displays. The platform meets the most stringent requirements for process environment and process stability.

OLED developments at the IIT's FlexE Center

The National Center for Flexible Electronics (FlexE) was established in 2014 as a Centre of Excellence at the Indian Institute of Technology (IIT) in Kanpur. The vision of the center is to "catalyse the development of domestic industry in the field of large area flexible electronics".

OLED lighting prototypes, FlexE Center

The FlexE center has some interesting OLED projects, and we recently had a discussion with researchers from the center to learn more about the OLED R&D activities.

Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters