Korean website DDaily is reporting that Samsung Display started mass-producing 5.25-inch QHD (Quad HD) AMOLED panels for the new Galaxy S5. If that's true, the next Galaxy flagship's screen will have an insane pixel density of 559.47 PPI, resulting from the 1440 x 2560 resolution. It's said that the new display uses a diamond-like PenTile pixel arrangement (similar to the AMOLED screens of the S4 and Note 3), this eliminating color reproduction issues that older PenTile screens have been blamed for.
Obviously, we must note that reports from Korea aren't always accurate, so for now nothing is certain. And we assume nothing will be certain until Samsung actually announces the S5. Still, it wouldn't be a surprise for the new Galaxy to sport a 5.25-inch screen with 1440 x 2560 pixels. China's Vivo already released a handset with a 1440 x 2560 pixel display (albeit a larger one, measuring 6 inches).
Sure, some will argue that 5.25-inch is too big for a smartphone. However, if you read our LG Optimus G2 review you'll see that a 5.2-inch handset can still be comfortable for one-hand usage as long as it's well-designed.
Samsung could unveil the Galaxy S5 as early as February (at MWC 2014). We'll be there to keep you in the know.
source: DDaily (translated)