Here's why - when the LG G3 is set to 1440x2560, each of the 3.7 million pixels it outputs takes exactly one pixel from its screen. This technique is called interpolation, and is known to cause the image quality to degrade.
This means the graphics unit has to stretch those 2m pixels into occupying space for 3.6m pixels, or the picture will look wonky. When we force the smartphone into 1080p resolution, we're making it put 2 million pixels in a room for 3.7 million pixels. But won't that degrade the image quality? After all, the LG G3's screen is made exclusively for Quad-HD resolution!
It's a bulletproof technique, one that every PC gamer has applied to coax higher frame rates out of their rig, for example. This will result in a considerable load being taken off the hardware.
If we force the LG G3 to work in 1080x1920 resolution, the display's fixed resolution will stay the same, but much less pixels - 2,073,600, to be precise - will be fed to it.
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