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| Layers of an amoled screen |
According to Nokia, the 3 main culprits of drawing vast amount of power on our mobile devices are the transmitter, receivers and the screen. The industry was able to minimize the energy drawn by the transmitter and receiver already (but i doubt it with 3g/HSDPA transceivers which still significantly lessens the battery life of phones when turned on) that's why manufacturers are now focusing on screen. They're right because before, mobile phone screens don't usually go larger than 2.5-3" but now 3.5" and above is becoming the normal size for touch screen phone, screen's power consumption becomes critical.
