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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

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

A 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.

FHD AMOLED panel from Tianma, FPD China 2015

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

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

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