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OLEDON develops vertical plane source deposition technology for large OLED TV manufacturing

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Hwang Chang-Hoon, CEO of OLEDON, which has developed plane-source deposition technology for small & medium-sized OLED and large area OLED, said that it is under development of vertical plane source deposition technology capable of manufacturing ultra-large OLED TVs of 77 inches or larger. Hwang introduced the related technology that it is possible to mass produce OLED TVs of 77 inches or more without the sagging problem of large substrate such as 12th generation (3300 x 4000 mm) substrate when using vertical plane source deposition technology.

According to Hwang, the production yield for 75 inch TVs or larger with the conventional inline type evaporator might be very low due to severe sagging of the substrate and difficult control of many linear sources. To solve this problem, Hwang said that a new 12-generation large-area cluster-type deposition technology is needed, and that vertical plane source deposition technology will be an appropriate alternative.

On the other hand, OLEDON holds the original patents for plane source deposition technology. It also filed a patent related to the curved plane source FMM deposition for high-resolution AMOLED manufacturing, and a patent related to the vertical plane source deposition technology for manufacturing large-area OLED TV.

 

TCL announced “Establishing large-area OLED panel production plant”, is solution processed RGB OLED mass production accelerated?

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China TCL will invest RMB 42.8 billion (US$ 6.71 billion) in Shenzhen to establish a factory for large-area OLED panel production. According to South China Morning Post, TCL recently announced that it will produce 90,000 units on the basis of 70-inch panel in the new production line of Gen 11 (3370 mm x 2940 mm) with the goal of mass production in March 2021 in the data submitted to the Shenzhen Stock Exchange. The main products are to be known as 65-inch and 75-inch OLED panels, and 65-inch, 70-inch and 75-inch display panels with 8K resolution.

TCL will form a partnership with the China Development Fund for the necessary financing and will set up a new production line at TCL’s semiconductor subsidiary with RMB 20.3 billion.

Large-area OLED to be produced by TCL is expected to adopt solution process RGB. At the ‘4th OLED Korea conference’ hosted by UBI Research in March, James Lee, deputy chief engineer of TCL mentioned about the development of next-generation premium TV with the screen size of 70-inch or more and 8K resolution, based on the solution process.

Lee said, “The price difference between OLED TV and premium LCD TV is estimated to be reduced to 1.4 times when the price of large-area OLED panel is lowered by the operation of LG Display’s Gen 10.5 plant in 2020. We are developing solution process technology for large area OLED and it will be applicable to Gen11 factory. ”

Gen 11 production line is capable of producing six sheets of 75-inch OLED panels, being able to achieve a yield three times higher than Gen 8.5 production line and a cutting efficiency of over 95%. In addition, it is possible to produce large-area OLED panels with a real RGB structure instead of the WRGB structure when solution process is applied. Based on this, TCL emphasized that the construction of the Gen 11 solution process OLED mass production line is essential. Meanwhile, TCL has jointly established JUHUA Printing Display Technology with Tianma, a Chinese company, in 2016 through CSOT, which is a subsidiary of TCL, and is continuously developing the inkjet printing process by a Gen 4.5 R&D pilot plant.

 

OLED TV continuing to evolve

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At the ‘4th 2018 OLED Korea Conference’ hosted by UBI research on March 7-8, Dr. Han Chang-Wook, Chief Research Fellow of LG Display, made a presentation for the development process of OLED TVs and emphasized the image quality of OLED, design flexibility and expandability.

At first, Dr. Han introduced three core technologies including TFT technology, OLED stack technology, and compensation circuit design applied to OLED TVs. He said, “We changed the TFT as top gate coplanar structure for UHD implementation in bottom gate TFT applied to FHD.” He also mentioned “We changed the WRGB OLED pixel structure from 2 stack structure to 3 stack structure to improve the luminance and color reproduction ratio, and designed the compensation circuit so that it does not affect the OLED even on 8K large screen.”

He commented, “Unlike LCDs that control pixels with local dimming, OLEDs have pixel dimming controls, which allows for full black representation and less halo effects”

Explaining that OLED allows greater design flexibility and expandability because of the self-illuminating properties that does not require backlight, he referred to the mirror display and transparent display applicable to indoors, and the world’s first 88 inch 8K OLED TV and 65 inch rollable OLED TV exhibited at CES 2018.

Dr. Han said “We expect large OLED panel production to be tripled, compared to 2016, with the expansion of production lines and yield improvement in 2018. In addition, the company will be able to ship over 6 million large area OLED panels by 2020 through the expansion of its Paju and Guangzhou plants.” He also announced that the company will increase continuously the production for OLED panels, which were 5% of the total display panels in 2016, by 40% by 2020.

LG Display, Awarded ‘Achievement Award’ for development of OLED TV at Japan OLED forum

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LG Display announced on the 16th that it received the ‘Achievement Award’ for the first time as a foreign company in recognition of the superiority of WRGB technology that enabled the production of large OLED TV and the pioneering of the large OLED TV market at the 24th Japan OLED forum held at the NHK Science & Technology Research Laboratories in Tokyo.

55-inch transparent OLED, LG Display unveiled at CES 2017. Source : LG Display

The Japan OLED forum is an academic society where experts from Japan’s major industries and academia gather together to discuss and discuss solutions for academic, applied research, and practical applications related to OLED, such as Tokyo University, Kyushu University, Sony, JDI and JOLED.

According to the Japan OLED forum, LG Display is recognized for its technological ability to produce large-size OLED TVs and for pioneering large OLED TV market and won the award for achievement for the first time as the overseas company.

The technology that LG Display recognized for its achievements is WRGB technology that builds up R, G, B organic materials on a thin film transistor (TFT) vertically and adds white elements to make four subpixels, not the RGB methods that arrange R, G, B organic materials on a thin film transistor (TFT) horizontally..

LG Display used this technology to mass-produce OLED TV panels for the first time in the world in January 2013 while pioneering the large OLED TV market.

LG-Display emphasized “this award is significant because it acknowledged the technology of LG Display, which produces large-sized OLED panels in Japan, which is the mainstay of flat panel displays”.

Oh Chang-ho, Managing Director of LG Display’s OLED TV Development Group, said, “I am extremely honored that LG Display has been recognized for its OLED technology by industry-leading experts”, and “We will make efforts to contribute to the development of the display industry by developing differentiated OLED products in the future,” .

On the other hand, LG-Display was not only able to realize excellent image quality with 65inch UHD Wallpaper OLED panel in SID 2017 but also received the Display of the Year this year as an innovative product that presents new possibilities for display in terms of application scope and design.

Solution Process OLED TV is prospected to be launched on the market in 2019, targeting the Mid-end TV Market

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According to “Market Entry Analysis for Solution Process OLED -The Possibilities and Opportunities” issued on November 14 by Ubiresearch, OLED TV, produced in solution process method, is prospected to be launched on the market in 2019.

Solution process is a technology which enables producing OLED panel in RGB pixel structure without any panel division on a device higher than G8, which major AMOLED panel producers has actively engaged in developing.

However, lamp efficiency and life cycle have no option to decrease because luminescent materials have lower purity than that of evaporation materials as luminescent materials applied to solution process should be mixed with various solvents in order to make the existing evaporation materials ink. Nevertheless, why major panel producers has actively engaged in developing solution process is that production cost can be declined as the usage efficiency of luminescent materials is high without using color filters and its structure is simpler than that of OLED panel using WRGB method.

According to the report, it is said that although developing luminescent materials for solution process OLED has been fully engaged, it should be more efficient than that of WRGB methods so as to enter the premium market. However, it seems substantially difficult that the capacity of solution process OLED surpasses that of WRGB as WRGB has been developed in top emission structure to improve its efficiency by over 20% and evaporation materials have also constantly been developed. Rather, based on proper level of life cycle and efficiency, it would be competitive to replace LCD targeting the mid-end TV market, according to the report.

Issues on OLED, QLED, hybrid QD, which can be applied to solution process and possibilities to enter the market, comparative analysis on the capacity of present solution process OLED, supply chain of QD industries, and major soluble OLED material producers are included in this “Market Entry Analysis for Solution Process OLED -The Possibilities and Opportunities” and it is expected to help the relevant producers understand the solution process industry.

Meanwhile, it is predicted that the market of large-scaled solution process OLED panel over 55 inch will begin in earnest being mass-produced as of 2019 and have accounted for the entire wide OLED panel market by approximately 15% growing by approximately US$ 1,000 million by 2021.