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ok so as for the red tint. technically its not suppose to be like that, it just happens to work that way because Red and green are more efficient. Red being the most efficient. in the early days of OLED's used in phones, which most americans have never seen, you could see the screens glow red while the phone was off because the battery would leak and it would only take a little bit of power to active the molecules. So this is most likely what you are seeing , red being more efficient.
ok now the next question you will ask is, danny if OLED are so efficient why does it pretty much equal that of lcd or some cases use more. this is due to using different types of molecules for each color. Out of the three colors red green and blue, blue is the least efficient and the shortest to live. in order for companys to actually commercially use OLED's they needed to make blue more efficient and live longer. so the phones are optimized to the blue color,,,,this is why you see whites with a blueish tint. technically it is a perfectly exceptable white but compared to other whites its easy to see, while im on the topic of white.
White color is made by activating red green and blue together so this takes up the most power. but that is not where your battery is going.
When we talk of efficiency what it means is that there is no loss of energy, when screens get hot thats low efficiency. an OLED's takes alot more electrons and protons and utilitzes them by turning them into photons the particles of light we see....where as LCD or plasma...etc do produce photons but they also loose some of that energy to heat that they produce. Knowing that, your SAMOLED screens are not really saving you battery because of a couple reasons. 1st being even though black colors dont activate the molecules every other color is grabbing every electron and spitting them out as photons, the oled is not leaving electrons on the table so for every electron that is saved by black is utilized by other colors. which inturn gives you these bright popping colors. 2nd reason is. even though the OLED screen is doing all this it still is saving power. So if you are a phone designer and you have an oled that is not only leaving some juice on the table and but also is leaving you phone space from its thin design what do you do.... you redirct. now with power and room to spare you throw in something like a hummingbird processer and you tweak the optimal voltage cause you know you can afford to.
this is not just samsung any designer would do the same before you start throwing stones, this is a business.
So should it be like this.,,, knowing all that you know above, dropping the power used to light the screen any lower will result on reds and greens glowing because blue is shut off and you will get weird tints.
Remember OLEDs are a very new technology still in its infancy, everyday we are working to make blue more efficient and live longer. and also bringing the other colors to new levels aswell. Over the next couple years you will see alot of other companys that you know very well switch to OLED's as the technology becomes more refined and affordable
Im sorry about the brightness of it but in return you get crazy contrast ratio and vivid colors.... if its to bright for some of you try out privacy filter it will but an overlay on the screen. i use black it gives you a purpleish tint as moonspell mentioned but if you just want to check the time at night without getting blinded it really helps lol