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:

TCL plans to start producing OLED TV panels by 2023, using an inkjet printing process

TCL said in a recent press conference that the company plans to start producing OLED TV panels in 2023. These OLED panels will be printed using an inkjet printing process.

TCL has been a long time believer in inkjet printing for OLED displays, and the company has established Juhua Printing in 2016 (together with Tianma and other collaborators) as an "open-innovation platform" to develop ink-jet printing of OLED panels. In 2020 TCL invested $187 million USD in Japan's inkjet printing developer and producer JOLED, and has also signed an agreement to jointly develop OLED TV printing technologies.

JOLED starts mass producing inkjet-printed OLED displays under the OLEDIO brand

JOLED announced that it has started to mass produce OLEDs at its new 5.5-Gen production line in Nomi, Ishikawa Prefecture, Japan. JOLED brands its new displays as OLEDIO displays. JOLED plans to produce 10- to 32-inch displays, targeting applications such as high-end monitors, automotive displays and medical monitors.

LG UltraFine OLED Pro photo

JOLED also branded its production technology, based on ink-jet printing, as TRIPRINT.

Researchers from Germany in collaboration with Oreltech use printed silver-inks as OLED electrode

Researchers from the Helmholtz Center Berlin for Materials and Energy and the Physics Department of the Humboldt University Berlin, together with Oreltech, developed a new flexible OLED prototype that uses Oreltech's silver-inks to deposit electrodes on PET substrates.

Helmholtz Center - Humbolt Univeristy - Oreltech, silver-ink PET OLED device structure and process

The researchers report that the new device outperforms ITO-based devices in both efficiency and luminance - and they are offer better bending stability.

DSCC posts its latest outlook for the OLED materials market

DSCC posted an interesting post with its latest views and forecasts on the OLED material market. The company expects AMOLED stack material sales to grow at a 18% CAGR in the next five years, from $294 million in 2019 to $2.46 billion in 2024. Compared to its previous estimate, DSCC sees higher sales as demand for OLED TVs and OLEDs in the IT market (tablets and notebooks) is increasing.

AMOLED material revenues by application (2019-2025, DSCC)

DSCC also posted an analysis of LGD's new evo OLED material stack. Compared to LGD's "standard" WOLED stack, the evo adds an emitting green layer to improve the brightness by 20%. This of course adds an extra material cost to the panel price.

JOLED supplies its printed OLEDs for LG's upcoming 31.5-inch 4K monitor

A couple of days ago, LG Electronics announced its first OLED monitor, the 31.5-inch 4K UltraFine OLED Pro, model 32EP950. Today JOLED announced that LG's monitor uses the company's printed OLED panels.

LG UltraFine OLED Pro photo

JOLED (Japan OLED) was established in August 2014 by Japan Display, Sony and Panasonic to produce OLED displays using inkjet printing technology. In December 2017 JOLED started commercial low-volume production of its 21.6" 4K OLED panels, at the company's pilot 4.5-Gen line.

Will TCL launch its first printed OLED products at CES 2021 next week?

TCL has been involved with OLED inkjet printing technologies for many years, and the company''s chairman and founder Li Dongsheng yesterday posted that the company will reveal its first printed OLED products next week. Li also uploaded the following video that showcases the company's inkjet printing technology:

This is somewhat surprising as it may be too early for TCL to actually launch inkjet printed OLEDs. TCL has been a long time believer in inkjet printing for OLED displays, and the company has established Juhua Printing in 2016 (together with Tianma and other collaborators) as an "open-innovation platform" to develop ink-jet printing of OLED panels. Last year TCL invested $187 million USD in Japan's inkjet printing developer and producer JOLED, and has also signed an agreement to jointly develop OLED TV printing technologies.

Notion Systems, MBraun and the Fraunhofer IAP develop a novel display industrial production process based on inkjet printing

Notion Systems, MBraun and the Fraunhofer Institute for Applied Polymer Research (Fraunhofer IAP) are co-developing new inkjet production technologies, aimed for the display market - specifically for OLED, QD and microdisplays.

The Fraunhofer IAP OLED production line (Potsdam)

The three partners are combining their respective competencies to present themselves together as a partnership supplier off all-in-one solutions. The Fraunhofer IAP is developing custom-made processes for display manufacturing with tailor-made inks. To achieve an industrial-scale best-in-class process solution, the parties are looking into all major pre-and post-processing steps, the substrate and the production equipment such as the inkjet print head.

JOLED and AERQ to integrate medium-sized OLED displays in aircraft cabins

Japan-based inkjet printed OLED JOLED announced a partnership with Germany-based AERQ to integrate medium-sized OLED displays in aircraft cabins.

AERQ, interestingly, is a joint venture between LG Electronics and Lufthansa Technik, founded in 2019. AERQ aims to introduce innovative technologies to the aviation industry, and the company provides a digital ecosystem for aircraft cabins that consists of an open IT platform, inseat system, and Cabin Digital Signage. AERQ has already been showing large-area OLED display for aerospace applications (using panels by LG Display).

NajingTech produces Quantum Dot Displays with Inkjet Technology from Notion Systems

This is a sponsored post by Notion Systems

Najing Technology Corporation Ltd., the leading Chinese manufacturer of quantum dot materials uses the Notion n.jet display systems for QD displays and light emitting diodes development and pilot production.

NajingTech QD printing using Notion System inkjet printer

The n.jet display series prints functional layers in various steps of display production and for various display technologies. This includes rigid, flexible, OLED, QLED and LCD displays. In addition to its unparalleled precision, the platform complies with highest demands on process environment and process stability.

Cambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDsCambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDs