Japan Display Inc developed a 5.2-inch full-HD (1,920 x 1,080-pixel) OLED panel with a resolution of 423ppi.
The panel was realized by combining white OLED devices and color filters (CFs).
An increasing number of high-end smartphones are coming with full-HD LCD panels. For example, NTT Docomo Inc released four smartphones equipped with a full-HD LCD panel as "Spring 2013 models."
In September 2012, Japan Display developed a 4.5-inch HD (1,280 x 720-pixel) OLED panel with the same "white OLED device + CF" method (See related article). Its resolution is 326ppi, which is the same as the resolution of the iPhone 5's display.
Since then, the company has further improved resolution and, this time, developed the 5.2-inch full-HD panel with a resolution of 423ppi. It uses red, green, blue and white pixels as in the case of the previous panel.
Japan Display realized the high resolution by combining its low-temperature polysilicon (LTPS), white OLED and drive technologies. And the company intends to solve problems involved in volume production by deepening ties with Japan-based material and equipment makers.