DisplayMate, a company known for their in-depth display reviews (among other things), did a screen test on a pre-production flagship unit from Samsung – the Galaxy S4, and they concluded that it is just as good as the "Retina" display found on the iPhone 5. The 5" 1080p Super AMOLED display has a 441ppi pixel density, however, due to technology involved it somewhat difficult to compare the PenTile matrix with the high resolution LCD screens.
Still, DisplayMate notes that the screen on the Galaxy S4 is comparable to the one on the iPhone 5 as Retina has 326ppi while Galaxy S4 has 312 red and blue pixels per inch, regardless of the aforementioned 441ppi pixel density. The iPhone 5 is "significantly brighter" but the Galaxy S4 has a more accurate representation of white and better screen uniformity.
Worth noting is that the iPhone 5 still has a tighter color gamut than Samsung’s flagship, which in turn gives the user of the phone a more realistic representation on the screen – but the gamut is massively enhanced on the Galaxy S4 when compared with the S3. PenTile arrangement is not a problem on the Galaxy S4, as there is no characteristic fuzziness on the edges of the text – resolution is simply too high for that to occur.
Even though the screen brightness on the Galaxy S4 is a major step ahead from the previous model, it is still not on par with the Retina
It is no secret that the display on the Galaxy S4 is "a major enhancement and improvement" over the Galaxy S3. Samsung continues the rapid and impressive improvement of the OLED display technology, and according to the display specialist Raymond Soneira, it can already challenge the best LCDs out there. DisplayMate managed to measure a 20 percent improvement in power efficacy between the Galaxy S3 and S4, and a 25 percent increase in brightness.
Light Spectra for the Galaxy S4 and iPhone 5 shows that the OLED is still relatively narrow, ?with deep notches between the primaries?, which results in unnatural (oversaturated) colors.
Soneira concludes that OLEDs will probably pull ahead of LCDs in both brightness and efficiency in the near future though it is worth adding that the LCD technology is not in a standstill. Full details of the report are available at the source link.
Viewing angles performance comparison