Sharp Corp unveiled a flexible OLED display that can be bent into a desirable shape at Ceatec Japan 2018, which took place from Oct 16 to 19, 2018, at Makuhari Messe, in Chiba City, Chiba Prefecture, Japan.
This time, Sharp exhibited two models of the display. One is an S-shaped display while the other is an arch-like display. Both of them use a plastic substrate as a base material and have a screen size of 6.18 inches and a resolution of 536ppi.
In September 2016, Sharp decided to make a capital investment of about ¥57.4 billion for establishing a pilot production line for OLED displays, aiming to start operation of the line in April to June 2018. According to the company, the line started operation as scheduled. Sharp's OLED display will be used for its "Aquos Zero" smartphone that was announced Oct 3, 2018.
The flexible OLED display showcased this time was also made on the production line. As in the case of commonly-used flexible OLED displays for smartphones, driving TFTs and OLED elements are made on a resin layer formed on a glass plate. After the glass plate is removed, it can be used as a flexible OLED display.
For the driving TFTs, low-temperature polycrystalline silicon (LTPS) is used. OLED materials are attached to the substrate by using a vacuum deposition method. Red, blue and green OLED materials are applied by using a metal mask.
The front-end process, which manufactures driving TFT boards (backplanes), is carried out at Sharp's Mie Plant (Taki-cho, Mie Prefecture). And the rear-end process, which vapor-deposits OLED elements and seals a panel, is conducted at its Sakai Office (Sakai City, Osaka Prefecture).