Semiconductor Energy Laboratory (SEL) Co Ltd, Advanced Film Device (AFD) Inc and Sharp Corp announced that they have prototyped a 13.3-inch 8k (7,680 x 4,320-pixel) display panel using OLEDs in a lecture at the SID 2014 academic conference (lecture number 44.1).
The 8k panel features a resolution as high as 664ppi (pixel per inch). It was realized by combining white-light OLEDs with three kinds of microcavities to narrow wavelengths down to those of red (R), green (G) and blue (B) lights and applying color filters to them. However, its red color reproducibility is slightly low. It has an 84% or wider color gamut on NTSC standards while many OLED panels have an about 100% color gamut.
The backplane of the panel was realized by using the CAAC-OS (c-axis aligned crystalline oxide semiconductor) technology. Each OLED is driven by five transistors and one capacitor (5T+C) including the circuit for compensating the fluctuation in threshold voltage. The number of pixel transistors is as large as 497,664,000.