At CES 2015, I visited MediaTek at CES 2015, and talked to product marketing Ervin Lai about their 120Hz mobile display.
As a previous post at AnandTech says, the display only uses ten percent more power during active use than a 60Hz display. Presumably, when idling (refresh throttled back automatically to save power in idle moments), it likely will not need additional power. For those concerned about battery, this could be a power management setting.
I did not have a chance yet to run TestUFO motion tests, however, I saw the motion on the 120Hz smartphone was much, much, much smoother. I visually confirmed that it is an IPS LCD with good viewing angles, and not a TN LCD with poor viewing angles!
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