[FPDI] Japan Display Exhibits 4.5-inch 326ppi OLED Panel

Nov 1, 2012
Shinya Saeki, Nikkei Electronics
The 4.5-inch OLED panel
The 4.5-inch OLED panel
[Click to enlarge image]
[Click to enlarge image]

Japan Display Inc exhibited a 4.5-inch 1,280 x 720-pixel OLED panel with a resolution as high as 326ppi at FPD International 2012, which runs from Oct 31 to Nov 2, 2012, in Yokohama, Japan.

The company plans to start volume production of the panel, which is targeted at mobile devices such as smartphones, in fiscal 2014.

To realize the high resolution, the panel uses four color filters (CFs) using white OLED devices and red, green, blue and white colors. The structure of the OLED device is a top-emission type in which light is extracted from the side opposite to the TFT substrate. This is one of the candidate technologies for volume production of high-resolution OLED panels, Japan Display said.

Japan Display started the development of the OLED panel after the establishment of the company (April 2012) and prototyped it by combining the technologies of the three companies that were merged, the company said. It did not comment on the material for the white OLED device, its formation process or the type of the driver element (TFT).

The pixel pitch of the panel is 78μm. Two of the red, green, blue and white sub-pixels were arrayed in each of the longitudinal and transverse directions. The panel's maximum screen luminance with an all-white signal is 400-500cd/m2. It has a contrast ratio higher than 10,000:1 and about 90% color gamut on NTSC standards. But Japan Display aims to increase the color gamut to 100% before the volume production.

The power consumption of the panel has not yet been measured, but the company said that it will be lower than in the case where a white OLED is combined with red, green and blue CFs because of the white sub-pixel added for the new panel.