[LED/OLED EXPO 2015] Low Cost OLED Lighting Panel Production, QD Film Provides the Solution?

One of the reasons that OLED lighting is not becoming commercialized, despite its diverse advantages compared to other lightings, is its high price. The most fundamental way to reduce OLED lighting panel cost is investment in OLED lighting panel mass production line. Price reduction for components and materials is also an important factor.

 

The OLED lighting panel that is currently being mass produced has red/green/blue or yellow/blue stack structure. Also the use of tandem structure of more than 2 stacks to increase efficiency makes the process complex, lowers the yield, and increases the amount of materials used, and is becoming a key factor in increasing the production cost.

 

At LED/OLED Expo 2015, Cheorwon Plasma Research Institute (CPRI) displayed technology that produces white by applying light extracting film that contains red and green quantum dot (QD) material on blue OLED. CPRI forecasts that this technology of QD film applied blue OLED will be the solution for lowering OLED lighting panel production cost.

 

CPRI’s senior researcher Yong Hwan Yoo explained, “When QD light extracting film is applied to blue OLED, the evaporation processes are reduced compared to existing RGB or YB tandem structure OLED lighting. This could lead to production cost reduction as the yield increases and material cost decreases. If the QD purity improves, as well as blue material’s lifetime and efficiency, it is anticipated that the efficacy will match that of RGB or YB tandem OLED lighting panel.”

 

CPRI exhibited LED caps to be used for mascots at the opening/closing ceremonies of PyeongChang 2018 Winter Olympics, ultimately aiming for manufacturing them using OLED lighting panel instead of LED.

 

 

[LED/OLED EXPO 2015] O’CLESS Propels OLED Lighting Commercialization

At LED/OLED EXPO 2015 (23 – 26 June), HaeChan Design revealed that through OLED lighting specializing brand O’CLESS they are expanding into international market as well as within the domestic market in Korea.

 

HaeChan Design was established in July, 2013, and launched OLED lighting brand O’CLESS. O’CLESS is producing using the combination of LG Chem.’s OLED lighting panel, and their own designs and ideas.

 

In this exhibition, O’CLESS presented diverse lighting such as night light, portable light, stand light, mirror light, and rail connection down light. Particularly, smart system that can control down light using smartphone drew much attention from the visitors.

 

Seungchul Oh, the President of HaeChan Design, reported that they “began exporting to Japan and China following the domestic release in Korea”, and they are planning to “expand the market as a global OLED lighting specializing business once the new business establishment in Innovation City Chungbuk is completed”. Regarding the price issue, which is OLED lighting market’s biggest obstacle, Oh viewed future of OLED lighting market in a positive light: “P company’s night light is being sold for 200,000-300,000 KRW (200-300 USD) but even with application of OLED and Retinispora wood, O’CLESS’ product has competitive edge with approx. 100,000 KRW (100 USD). Although panel’s price is essential as design and practicality are more important in the lighting industry, application creation appropriate for the high cost of OLED is more important. OLED panel price has already fell considerably and will continue to do so and therefore can compete against LED or other lightings in terms of price.”

 

In February this year, HaeChan Design installed approximately 1,000 OLED desk lamps with LG Chem.’s OLED lighting panels in Seoul National University’s library. They also set up booths in 2014 LED/OLED Application & Technology Show and 2015 Kyunghyang Housing Fair, focusing on O’CLESS marketing.

 

O'CLESS Booth, LED/OLED EXPO 2015

O’CLESS Booth, LED/OLED EXPO 2015

[SID 2015] High Resolution OLED for Commercial Display Too! SEL Reveals 81inch Multi OLED Display

Commercial display is a display installed in public areas. With the advantage of being able to deliver various information without being restricted to a place or time, it is becoming a new display market.

 

In order to lead increasingly expanding commercial display market, key panel companies are leaning toward high resolution and large size panel exhibitions. Recently released commercial displays have enlarged the size by attaching small LCD panels in a tile style creating bezel between panels. In LCD sector, commercial display products with minimized bezel are being developed.

 

However, 8K ultra high resolution commercial display has been produced without bezel through OLED. In SID 2015, SEL revealed world’s largest 81inch 8K OLED multi display that was produced by combining 36 13.5inch 8K flexible AMOLED panels.

 

The key technology is transparent sections of right and bottom edges of the panel. The FPC and scan driver sections of each panel are overlapped with corners of transparent edges (see below diagram).

 

SID 2015 커머셜 디스플레이3

 

 

Daiki Nakamura of SEL revealed that commercial displays of various sizes and shapes can be produced using flexible AMOLED panel and as it is suitable for applications on columns, commercial display can be a new market for OLED.

 

SEL had previously exhibited 27inch 8K multi OLED display using 4 13.5 inch 8K flexible OLED panels in Display Innovation 2014.

 

SEL’s 81inch 8K Multi OLED Display, SID 2015

SEL’s 81inch 8K Multi OLED Display, SID 2015

 

[SID 2015] Chinese LCD’s Continuous Evolution. OLED, What To Do?

LCD technology of Chinese companies is continually evolving. In SID 2015, BOE exhibited world’s largest 110inch 8K and world’s first 82inch 10K LCD panels. CSOT drew much attention with its world’s largest 110inch UHD curved LCD TV. By exhibiting ultra high resolution and large size LCD panel ahead of Korean and Japanese panel companies, CSOT aptly demonstrated that Chinese companies have caught up to Korean and Japanese technology skills.

BOE presented NTSC 99% 27inch QHD LCD panel, and CSOT showed NTSC 118% 55inch UHD LCD panel. Particularly, CSOT exhibited 4mm thick 32inch FHD LCD TV and 5.5 mm thick 4K curved LCD panel; this showed that LCD is able to catch up to OLED’s thinness and color gamut advantages. Thus, with LCD’s continuous new technology development and price competitiveness, LCD and OLED’s leadership competition will once again heat up in next generation display’

The current large area TV market is led by LCD and OLED is slowly expanding the market starting with premium TV. Even in premium market, with price competitiveness LCD is one step ahead with QD film applied LCD TV. Therefore, the technology development of LCD that is catching up to OLED’s advantages is expected to be a hurdle for OLED’s market opening.

Although LCD’s color gamut, thickness, contrast ratio, and response time is being continually improved and can approach to OLED’s level but cannot be equal to OLED in all areas. For example, if the thickness is reduced in LCD, the QD film application needed for increased color gamut is difficult. Even if panel with many positive traits altogether is developed, it is expected to take much time giving OLED chance to drop the price to LCD level. Therefore, reducing OLED panel’s price by OLED’s active investment and yield achievement is analyzed to be an essential condition for next generation display leadership.SID 2015 중국업체의 끝없는 개발 SID 2015 중국업체의 끝없는 개발2

[SID 2015] JDI’s Flexible White OLED Scheduler

Japan Display (JDI) revealed product level of flexible OLED exceeding the demonstration standard of OLED panel exhibition. JDI has been carrying out white OLED panel development for several years, and had shown 5.2 inch flexible AMOLED panel in Display Innovation 2014.

5.2 inch flexible OLED panel revealed in SID 2015 is similar to last year’s flexible panel. It is 5 inch FHD (423ppi) with 0.05mm thickness and pixel structure formed by combining white OLED and color filter. LTPS TFT was used for backplane.

Flexible OLED produced by Samsung Display and LG Display has RGB structure. While the resolution is FHD, as it uses pentile type drive the actual resolution is about 320ppi. However, flexible OLED revealed by JDI has white OLED structure, which is structurally similar to WRGB OLED for OLED TV currently being produced by LG Display.JDI1 JDI2

[SID 2015] OLED’s Endless Evolution. SEL Reveals 8K Foldable AMOLED Panel

During the author interview on 3 June, first day of SID 2015 Symposium, Japan’s SEL (Semiconductor Energy Laboratory) revealed 13.5 inch 8K foldable AMOLED panel and drew most attention in the room. During the last year’s SID, SEL showcased OLED’s most evolved product at the time with 5.9 inch foldable AMOLED panel and 13.3 inch 8K AMOLED panel.

The 13.5 inch 8K foldable AMOLED panel that was shown this year is a product that combined last year’s foldable and 8K technology. It utilized RGB laminated white OLED, RGB color filter, and top emission structure. Additionally, 664ppi was actualized through 3Tr+1C/Cell structure and external correction method.

SEL2 SEL1

[SID2015] What is the Answer for Flexible & Transparent with Excellent Image Quality?

In SID 2015 Display Week (31 May – 5 June), LG Display’s CTO In Byeong Kang gave a keynote speech. He explained that future display in everyday lives will be actively applied to home, office, street, and mobile device areas through various applications including window, ceiling, mirror, kitchen, automotive, desk, commercial, and wearables. He added that OLED will be the answer to key technology of flexible display (curved, rolling, and folding), large-area transparent, and excellent image quality.

Key issues of flexible are bending radius and reliability. Kang emphasized that in order to reduce the bending radius, thinner substrate is needed, and to improve reliability, new material, components development, and internal and external shock mechanism research is important. He mentioned that although OLED is good for transparent’s transparency, light control, and reflectivity as key technology, LCD and LED display also have advantages of their own in transparent display realization. Kang concluded the presentation with the emphasis on the need of expansion into automotive, watch, architecture, and furniture companies from existing panel, material, and components companies’ ecosystem for commercialization of flexible and transparent display.

LG Display is currently mass producing plastic OLED panel for smart watch, and aiming for 80% automotive display market occupation in 2018 with approx. US$ 2,000,000,000,000 of revenue. In SID 2015, LG Display exhibited 18 inch rollable OLED panel, and 12.3 inch automotive OLED panel. Through the OLED and ecosystem’s expansion, it is anticipated LG Display will lead flexible and transparent display market following OLED TV.SID2015

[Finetech Japan 2015] Mobile Display up to 700 ppi. How about OLED?

At Finetech Japan 2015 (April 6-8), vice president of LG Display, Yoon Sooyoung, forecast the display resolution would evolve to 700ppi UHD for differentiation in technology. Japan Display’s CBO Yoshiyuki Tsukizaki also disclosed that a person can perceive up to 700ppi and estimated that mobile display resolution would therefore develop up to 700ppi.

 

Currently mobile display is being mass produced at QHD (approx. 500ppi), and UHD resolution is known to being actively developed for LCD. It is analyzed that UHD mobile OLED panel development will be a necessity in order to adapt to the trend toward high resolution. OLED is being mass produced in RGB pixel structure where FMM (fine metal mask) is applied. However, as FMM production technology is difficult, QHD AMOLED panel is being mass produced via pentile pixel structure rather than real RBG pixel structure. Therefore, technology for realization of mobile UHD resolution is expected to be a key issue in future.

 

For the mobile UHD AMOLED panel realization, securing shadow mask technology that allows for UHD resolution is important. In Finetech Japan 2015, V-Technology exhibited FHM (fine hybrid mask) technology that can produce 700ppi or higher resolution. V-Technology further revealed that “resolution of up to 738ppi can be produced using laser patterning technology after the formation of polyimide film on top of Ni mask”.

 

Additionally, another method is where white OLED + color filter is applied which uses color filter patterning technology. This is a comparatively easier method for producing high resolution, and JDI is aiming for mass production using WRGB structure. Chinese latecomers are also examining application of white OLED + color filter structure for high resolution AMOLED panel production.

 

The attention of the industry is now focused on how OLED will react and what solution will be generated facing LCD sector that is evolving toward UHD mobile display.

 

738ppi UHD Resolution FHM, Finetech Japan 2015

738ppi UHD Resolution FHM, Finetech Japan 2015

By Yu Jin Hong, reporter@olednet.co.kr

[FPD China 2015] Tianma, Reveals China’s First FHD OLED Panel’

[FPD China 2015]Tianma, FHD OLED panelA display company Tianma succeeded in developing China’s first OLED panel with FHD resolution. There are several companies that mass produces or is developing AMOLED panel for smart phones. Samsung Display and LG Display are in Korea, JDI in Japan, and AUO in Taiwan. In China, the companies include Tianma, Visionox, Truly, and EveryDisplay, as well as BOE. The 4 companies that are mass producing the AMOLED panel are Samsung Display, LG Display, AUO, and EverDisplay. Of these, only Samsung and LG are pass producing FHD AMOLED panel.

 

With LCD panel for mobile, products with resolution of FHD or higher are already being mass produced. However, due to the manufacturing process, it is difficult to produce OLED panel with FHD resolution or higher. As emitting materials are evaporated via fine metal mask (FMM), obtaining high resolution of high precision FMM is a priority. In order to manufacture high precision FMM, metal plate of 40um or less is needed, and also requires technology that allows for highly accurate process. Only 2 companies, Japan’s DNP and Toppan, can produce high precision FMM, and since they have exclusive contracts with Samsung and LG respectively, they cannot provide FMM. Therefore, JDI employs WOLED structure that does not require FMM for AMOLED development and commercialization.

 

To develop high resolution AMOLED panel, Tianma has been independently developing dual FMM. Although it has not been confirmed what type of FMM was used for the FHD AMOLED revealed in FPD China 2015, they exhibited 5.5inch FHD OLED product with 400ppi resolution.

 

Resolution of FHD or higher can be realized by manufacturing OLED panel itself purely by process, or by another method with pentile technology. Currently it is difficult to produce FHD with the first method and even Samsung and LG are utilizing the pentile technology. As such, it is likely that Tianma’s AMOLED is pentile driven. Pixel structure needs to be analyzed once the product is available on the market.

 

티안마 사진

FHD AMOLED panel from Tianma, FPD China 2015

 

150319_[FPD China 2015] Tianma, 중국 최초 FHD OLED 패널 공개2