[SID 2015] AUO’s New RGBY Pixel Structure, Can It Be an Answer for Low-Powered OLED?

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Display consumes most power out of smartphone battery usage. This means that low-powered display is most important in lengthening the smartphone’s usage time.

 

AMOLED panel is a self-illuminating device driven by each RGB subpixels, and theoretically power consumption should be much lower than LCD’s which requires BLU (back light unit) to be constantly lit. However, as OLED materials’ performance, particularly blue, is not sufficient the power consumption falls short of expectation.

 

In SID 2015, AUO gave a speech on new RGBY pixel structure attempting to solve the power consumption issue. AUO applied PSA (power saving algorithm) and SPR (sub pixel rendering) of RGBY method, not RGBG structure’s pentile method of existing FMM RGB mechanism, and reported that this showed higher definition and lower power consumption compared to the pentile method RGB applied for high resolution. Particularly it was shown that it can be a key technology for low-powered AMOLED panel through HD 4.65inch (317ppi) panel demo; the power consumption of yellow sub pixel (efficiency 80-120 cd/A) was reduced by 16-20% in comparison to existing RGB method.

 

Dr. Meng-Ting Lee of AUO told the audience yellow sub pixel application improves high resolution, high definition, low power consumption, and panel’s lifetime simultaneously and that AUO’s RGBY SPR and PSA technology can become key technology for AMOLED panel for mobile device.

 

AUO’s RGBY Pixel Structure, SID 2015

AUO’s RGBY Pixel Structure, SID 2015

 

Comparison of Power Consumption Between RGB and RGBY

Comparison of Power Consumption Between RGB and RGBY

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

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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).

 

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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?

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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

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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

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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.

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

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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

Chinese Panel Company, Reborn as Center of Mobile Device Display Market?

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Truly’s OLED panel mass production is smoothly being carried out. According to OFweek, Zhang Jintao (Senior Manager of Truly) revealed on May 20 that ‘the construction of Phase I of the company’s AMOLED production plant will be completed in June, and the equipment will be installed in October’. He also added that the production line will begin operation in the first quarter of 2016 after passing through tests.

 

Truly’s AMOLED project was approved by EIA (Energy Information Administration) in May 2014, and began line construction in July. The investment cost is approximately 63,000,000 yuan. For mass production, Truly purchased Samsung Display Gen4.5 line’s LTPS equipment, and ordered SFA’s evaporator. The total area of mass production line is 310,000m2, and total capa. is 30K.

 

Mobile device AMOLED panel companies in China are Visionox, EverDisplay, Tianma, Truly, and BOE. Visionox and EverDisplay are in the process of mass production using evaporators of SNU Precision and ULVA respectively, and supplying panels to several companies. Tianma and BOE are aiming for mass production in the second quarter of 2015.

 

At present, Samsung Display is occupying over 90% of total mobile device display market. However, as Chinese panel companies are expected to actively begin mobile device AMOLED panel mass production from 2016, it is estimated that there will be a significant change to the market flow.

What is the Next Key Technology in OLED Display?

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There is a breath of fresh air of paradigm shift within small-mid size display. Traditional display is turned on by the user’s actions as needed. But, technology, which is able to check information at any time, has been developed and is being applied to the actual product.

LG Display is mass producing world’s first plastic circular OLED. LG Display’s plastic circular OLED panel displays screen in the same resolution without power supply of power management chip via PSM (Power Save Mode). Through this, the panel is turned on for 24 hours a day with only 10~20% of power compared to typical driving mode. PSM is evaluated as innovative circuit design and was applied to G Watch R last year.

A similar function is applied to several other smart phones. Galaxy Note Edge and Galaxy S6 Edge have screen function, ‘Night Watch’. Once the time is set, information such as time, date, weather is displayed on edge screen during that time, Through this, the user can check displayed information at anytime for a period.

Yotadevices, a Russian venture company, announced the second version of Yotaphone2 on 13 May. On the front side of Yotaphone 2 is 5.0 inch AMOLED display, and on the back side is a black and white display with electronic ink (E-ink), so the user can use both sides of the smartphone. The back side of Yotaphone2 is always on; e-ink technology can be used without power if the screen doesn’t change, so user can use back display, without consuming much power. Yotadevices said, “The function of backside display can be set freely. Also, you can save power used for turning on the front screen because you can always check the information set by you.”

‘Always ON’ in a function where the display is always turned on to deliver information. It is difficult to apply to OLED display. This is due to the burn-in phenomenon, which occurs when a particular pixel of the OLED panel is depleted and discolored, maintaining a fixed screen for a long time. To apply the ‘Always ON’ to the OLED, the OLED light-emitting material must be improved or the image-processing technology must be developed to minimize burn-in phenomenon. LG applied the ‘Always ON’ in G watch R by reducing the burn-in phenomenon, using the new image processing technology which moves the screen gradually at regular intervals.

‘Always ON’ is expected to be used primarily in the automotive displays and wearable displays where information should be displayed for a long time, and is forecast to be a key feature of the display in future.

LG Display Changes Game Rules for Premium TV with OLED TV

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To change the rules of the game of TV market, LG Display held a media event on 19 May, overseen by Yeo Sang-deog, the president of LG Display’s OLED division. This event was structured only with OLED and showed LG Display’s determination regarding future OLED panel business.

 

Yeo Sang-deog mentioned that OLED panel will become LG Display’s future cash cow and suggested that LG Display could be reorganized to focus on OLED business.

 

In order for LG Display to commercialize OLED, clients who can buy the panels are important as well as companies that develop materials that can actualize qualities needed and necessary equipment. Yeo expressed that LG Display will engage in formation of ecosystem related to OLED industry to grow OLED panel as an export business.

 

For this event, LG Display prepared separate exhibition area formed only with OLED. The exhibition space was largely separated into 3 sections. The first area exhibited OLED TV and QD-LCD TV, which is receiving much focus recently, in comparison and demonstrated how OLED TV is much superior in terms of viewing angle, contrast range, and color gamut. The second exhibition space showed large size OLED panel. OLED TV with HDR technology which was shown in CES 2015, and convex OLED were shown, as well as transparent OLED. World’s first 500R curved OLED TV, wallpaper OLED TV with the thickness of a coin, and edge slice OLED TV were revealed. The third space was an area for what is becoming an issue, plastic OLED. LG Display exhibited 1.3 inch round plastic OLED for smart watch, 5.5 inch FHD curved plastic OLED, 6 inch active bending (dual bending) plastic OLED, and 12.3 inch cluster plastic OLED for dashboard in vehicle.

 

LG Display revealed all OLED products to domestic and international press, and demonstrated their confidence in OLED panel industry leadership.

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Visionox, Close to High Resolution AMOLED Panel Mass Production

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Visionox is earnestly developing high resolution flexible AMOLED panel with impending active AMOLED mass production. In CITE 2015 (April 9 – 11), held in Shenzhen in China, Visionox exhibited AMOLED product and OLED lighting.

 

AMOLED Display Panel by Visionox

AMOLED Display Panel by Visionox Source: Visionox

 

According to Visionox, although they cannot reveal detailed specifications as it is a newly developed prototype, they solved color shift issue and produced high resolution panel using high pixel arrangement technology. As a next generation product, flexible AMOLED mass production line is being considered.

 

In April 2014, Visionox developed 4.3inch 570ppi resolution AMOLED panel by developing new pixel formation technology. Additionally, Visionox established first Gen5.5. AMOLED mass production line at the end of 2014 and is preparing for active mass production. Mass production capacity is 15K and the products will be used in devices such as mobile phones.

 

OLED Light by Visionox

OLED Light by Visionox Source: Visionnox

 

Visionox is also focusing on OLED lighting panel industry. In 2009, Visionox produced first OLED decoration lighting products in Mainland China. Visionox is aiming for OLED lighting panel mass production in 2017, and working on improving lifetime and luminous efficiency.