[Galaxy Note II Q&A, Help & Troubleshooting] winlinmac001:
Most of us know by now the limitations of Producing AMOLED Displays for devices such as the Galaxy S, S2, Note 1, S3, and Note 2. All of these devices share the same screen-technology. There is always praise for OLED, but the technology is still pre-mature; that is why when you look at your display in the dark, you come across something called, the Mura Effect. Some folks claim they don't have it on their AMOLED displays. However,

all AMOLED displays have this limitation. Obviously, Samsung doesn't want to tell you this. Some might then consider their phone to be defective, whereas some won't.

. There is some degree as to how much Mura Effect your display has. Some displays have the Mura Effect in the form of black lines, / blotches, & dots, and some will have them in the form of faint stains, which can only be looked upon when viewed closely in the dark.

From my understanding, the Mura Effect occurs due to the way the display is aligned with the TFT. AMOLED displays are assembled in two layers, the OLED film on top, and the transistor plane below. Due to limitations of the manufacturing process, it is very difficult to get both layers aligned correctly & perfectly to produce a uniform, seamless, display; note that AMOLED displays are very thin. The contacts of the transistors which power the OLED screen are not 100% set on our displays. Therefore, problems begin to stir when you bring the brightness down to the minimum level; insufficient voltage prevents all the pixels on your AMOLED display to light uniformly. That's why brightness unformity issues are very common in AMOLED Displays as well. Voltage is too low at low brightness to get flawless picture quality. The low voltage at low brightness is too low to power all the pixels effectively in our displays. This explains why the Mura Effect shows.

I've made some interesting observations on the past AMOLED display's I've dealt with in the past.

1). In Displays which do not consist of black lines and blotches, but do consist of blocks of faint black stains entailing the Mura Effect; and faint horizontal lines (which become more prominent overtime), burn-in faster, and brightness uniformity issues, become quickly apparent in these particular displays. Colors are warmer compared to the contrary. Some yellowish tint / pink hue is also to be spotted.

2). Whereas, in displays which do display their Mura Effect in the form of lines of little blotches / dots, tend to have a better color reproduction & brightness uniformity, and do not show faint horizontal lines quickly overtime; though they eventually do due to the organic (half-life) nature of OLED's. Yellowish-tint is rarely found. However, blue-tint is more apparent on displays with this degree of Mura Effect.

[Note: Yellowish tint is not the result of glue (common in LCDs); the Yellow tint is a calibration issue, and though sometimes kernel / software updates may resolve the issue, the yellow tint is not completely gone].

My ultimate question is, does the kind of Mura Effect on the AMOLED screen on each Note 2 unit manufacture thus far determine the life expectancy of the display itself? What about the formation of dead pixels? Do dead pixels (due to low-voltage effect) form frequently depending on the extent of Mura Effect on our displays? If my display for instance has black lines / blotches / dots, does that increase my chances of living with a dud phone?