Visionox developed a new RGB pixel arrangement for OLED technologies that allowed them to reach 570 PPI. The company refers to this new technology as Z-Type arrangement and it includes 3 sub-pixels (RGB) per pixel (unlike Samsung's Pentile displays). The sub-pixels are densely packed (the aperture ratio seems very high) in a way that does not suffer from jagged edges.
Visionox told me that they cannot yet say when such displays can be commercialized, as there are still manufacturing challenges to overcome. In the meanwhile the company applied for both Chinese and international patents.
In any case, 570 PPI is very impressive. The AMOLED with the largest PPI in production is Samsung's 4.99" Full-HD panel (used in the GS4) that features 441 PPI. Earlier this month AUO announced that they developed a 5.7" WQHD (2560x1440) AMOLED - that's a PPI of 513, but that display is not commercial yet.
Sharp, and SEL developed a 13.3" 8K CAAC-OS OLED that achieves 664 PPI - but this one hasn't been unveiled yet and Samsung Display announced a while back that they are developing a 5.2" WQHD panel which will have a pixel density of 560 PPI and are also planning a UHD panel that will have a PPI of 860 (!).
Comments
This seemslike the perfect OLED display for HMD Oculus Rift for the commercial CV1 version. But the display's photo does seem to show a pronounced screendoor effect even though that the pixels are densly packed together. Hmmm
570 PPI is too low for ultimate display. Curerent printers have 1200-2400 dpi, and some patterns still cause visible aliasing
for instance, the OLED EVF that produced by sony, it is XGA 0.7", wouldnt this makes it "the largest PPI in production"?
That's a totally different product/technology, so it's not really wise to compare the two panels
I have a feeling that Samsung's choice to use pentile isn't arbitrary, nor is the sub-pixel size (or density). I would guess that it is motivated by a power consumption trade-off. Having larger sub-pixels, may mean more power to acheive a certain amount of brightness -- ie. the power consumed may not linearly scale with surface area for set brightness. This is a wild guess, and I would be interested to know the truth.
Still, having RGB sub-pixels seems both inevitable and desirable from a quality perspective, and the added resolution of Visionox's display is fantastic! OLED tech seems to be improving so rapidly year-over-year. It's hard to imagine where it will be before long.
Maybe we will soon see high-dynamic-range (eg. RGBL, where L == luminance) in a display. Or perhaps we will see 3D with eye-tracking (ie. holographics) explored for commercial mobile displays. I would also be interested in plastic screens with scratch-resistant diamond-like-coatings for extremely durable (shatter-proof) and light devices. One can dream!