Large Size OLED Panel Technology Match, ‘WRGB vs. Solution Process RGB’

Large size OLED panel is currently being mass produced by LG Display using WRGB method, and investment in this method for large size panel is being considered by OLED panel latecomers. Another method that can be used to produce OLED is RGB method. In 2013 Samsung Display mass produced using RGB method but halted the process due to problems in yield rate and technology. However, recently as key display companies are developing RGB method using solution process for large area OLED panel, latecomers are having to make a difficult choice in process selection.

OLED specialized panel company JOLED, established by JDI, Sony, Panasonic, and Innovation Network Corporation of Japan (INCJ), is aiming for mid-to-large size OLED panel production using solution process. Additionally, other companies including AUO, BOE, LG Display, and Samsung Display are developing large size OLED panel using solution process technology. In 2013, AUO presented 65 inch FHD panel that used solution process technology, and BOE revealed 30.5 inch FHD panel. Panasonic also presented solution process applied 4K panel.

According to 2015 White OLED Display Annual Report, published by UBI Research, WRGB method has an advantage in high mass production potential as open mask is used. However, due to the stack structure and color filter use, it has a disadvantage of increased panel production cost. On the other hand, the materials and process technology for solution process are not yet mature, but has the advantage of being able to produce large size OLED panel in Gen 8 size or larger without glass cutting using RGB method. It also can reduce the production cost as the material efficiency is high and does not require color filter.

At present the mass produced glass area by the latecomers forecast to manufacture large area AMOLED panel is expected to occupy approximately 30% of the total large area OLED market in 2020, and latecomers’ choice in technology investment will be a key point. Therefore, the large area panel technology leadership will be decided on whether WRGB and solution process methods can solve the issues that each has.

By DaRae Kim, reporter@olednet.co.kr