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[IMID 2022] ETRI to Show ‘Stacked QD-OLED’ With Top Glass Removed

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At IMID 2022 held in BEXCO, Busan, from August 23rd to the 26th, ETRI held an exhibition and presentation, ‘Development of QD-OLED Technology with Fine Quantum Dot Pixel Array using Inkjet Printing Process’.

Stacked QD-OLED structure/ ETRI

Stacked QD-OLED structure/ ETRI

Two glass substrates are used in the QD-OLED produced by Samsung Display, but the ‘Stacked QD-OLED’ developed by ETRI has a structure in which the glass with the QD color conversion layer is removed. In the stacked OLED, TFE and BM are formed on the light emitting layer, and the QD color conversion layer is formed by the inkjet printing process instead of the lamination process. The ‘Stacked QD-OLED’ structure has advantages such as material cost reduction and process simplification compared to the existing method.

ETRI explained that there are advantages of material cost reduction and process simplification compared to the existing process through this, and the thickness of the QD color conversion layer can be made thicker than before, resulting in a higher color conversion rate and less blue light leakage.

Meanwhile, ETRI collaborated with Kosan Tech for inkjet module head, Duksan Neolux for black bank material, and Chem e for QD material to develop ‘Stacked QD-OLED’.

‘Stacked QD-OLED’ Developed by ETRI

‘Stacked QD-OLED’ Developed by ETRI

▶ OLED Display Report Sample Download

[IMID 2022] Samsung Display to Start Mass Production of 49-inch and 77-inch QD-OLED Panels Early Next Year

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At ‘IMID 2022’, which was held in BEXCO, Busan, from August 23rd to 26th, 2022, Samsung Display exhibited 77-inch QD-OLED and foldable OLED such as ‘Flex S’, ‘Flex G’, ‘Flex Note,’ ‘Flex Gaming’, and ‘Diamond Pixel’.

77-inch QD-OLED TV/ Samsung Display

77-inch QD-OLED TV/ Samsung Display

The 77-inch QD-OLED exhibited by Samsung Display was very similar to the previously released 65-inch QD-OLED TV with a resolution of 4K, a contrast ratio of 1,000,000:1, and a refresh rate of 120 Hz, but Samsung Display revealed that there was a slight improvement in luminance.

Following the existing 55-inch and 65-inch QD-OLEDs, Samsung Display plans to start mass production of 49-inch and 77-inch QD OLEDs from early next year. If the MMG (Multi model glass) process is used in the 8.5 generation (2200x2500mm) ledger used by Samsung Display, it is possible to produce two 77-inch panels and two 49-inch panels, a total of four panels.

Samsung Display concluded with, “Depending on the situation of the set makers, a new size QD-OLED TV is expected to be released as early as the second quarter of next year.”

▶ OLED Display Report Sample Download

[IMID 2022 Keynote] Samsung Display Announces OLED Big Step in 2022

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At IMID 2022 held in BEXCO, Busan, from August 23rd to the 26th, Samsung Display CEO Joo-seon Choi gave a keynote speech, ‘Changing Display Industry with Disruptive Innovation’. He announced plans to expand the display business for automobiles and invest in micro-displays for AR/VR.

Samsung Display's mid- to long-term plans

Samsung Display’s mid- to long-term plans

First, President Choi mentioned the investment in 8.5G IT OLED and said, “When 8G ledger is used, glass efficiency is improved by more than 20% compared to the existing 6G half cut. This will accelerate the penetration of OLED in the IT market. Through this, we are also targeting the automotive display market in the future.”

Characteristics of premium OLED for automobiles

Characteristics of premium OLED for automobiles

Next, President Choi showed key features in Premium OLED in Automotive

 ‘Safety’ – accurate information with the characteristics of premium OLED for automobiles.

‘Interior Design’ – such as narrow bezel and multi-lamination.

‘Entertainment’ – high brightness through tandem structure and wide color gamut of OLED emphasized.

Samsung Display's AR/VR micro display

Samsung Display’s AR/VR micro display

Finally, “The AR/VR industry is a great opportunity to expand the display market. Samsung Display plans to develop micro-displays for AR/VR, such as micro-OLED and micro LED, to keep pace with the market needs. For the AR/VR industry to develop, cooperation across the ecosystem is important.”

According to the announcement, Samsung Display is aiming for commercialization in 2026 by mass-producing prototypes in 2024 and expanding the capacity in 2025. This is the first time that Samsung Display has revealed a specific time for AR/VR business.

In the announcement, CEO Joo-sun Choi predicted that the self-luminous display market would reach $100 billion in 2030 and that displays would penetrate all industries.

▶ OLED Display Report Sample Download

[IMID 2022] SEL Develops 5,291ppi Micro OLED Display Integrating Si CMOS and OSFET

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At IMID 2022 held from August 24th to the 26th, Semiconductor Energy Laboratory (SEL) announced that it has developed a 5,291ppi micro OLED display for AR/VR that integrates Si CMOS and OSFET.

OLED, OS, Si structure/SEL

OLED, OS, Si structure/SEL

According to SEL’sannouncement, two problems arise when manufacturing an OLED display with high pixel density by integrating the existing Si FET. The first is that the source/gate drivers are located outside the display area, which increases the bezel width. A thin bezel width is a prerequisite for a decent AR/VR device size. The second issue is the high mobility of Si FETs and the balance between pixels. In order to apply Si FET to Micro OLED, it is necessary to reduce the transistor size while suppressing the increase in current.

In order to solve these problems, SEL announced that it has manufactured an OLED micro-display prototype that integrates Si CMOS and OSFET. SEL states that, “The mobility of OSFETs is not as high as Si FETs, but it is sufficient to drive OLED devices. Through the OLED/OS/Si structure in which OS (OSFET) and OLED are combined on CMOS, the width of the bezel area can be reduced by up to 40%. In addition, in the characteristic evaluation of OSFETs, it was possible to implement deep black and drive a low rate of fire, and the good distribution in a channel length of 200 nm and a breakdown voltage of about 20 V made it suitable for high voltage OLED driving of white-tandem OLED devices.”

The size of the 5,291ppi micro OLED display announced by SEL is 0.51 inches, the resolution is 1920×1920, and the pixel size is 4.8×4.8 μm. The backplane is a combined structure of 130 nm Si FET and 60 nm OSFET.

5,291ppi Micro OLED display specification/ SEL

5,291ppi Micro OLED display specification/ SEL