Refresh Rate explained
Now without getting too technical, the refresh rate (most commonly the vertical refresh rate or vertical scan rate is the measure of how many times a second that the LED Screen hardware can draw data.
This is distinct from fame rate, in that the refresh rate includes the repeated drawing of identical frames of data, while frame rate measures how often a video source can feed an entirely new frame of data to the screen.
Confused? Well all you really need to know, is that having a great refresh rate of at least 1850 Hz means a smooth motion on the screen and eliminates flicker on your phone or camera.