Presently, the maximum supported resolution is 1800x1440, greatly improved from the color TV resolution of 320x525. Refresh rate refers to the speed at which a screen is repainted or refreshed. A higher horizontal scan rate allows a monitor to run at higher resolutions with acceptable refresh rates. The higher the vertical refresh rate is, the less flicker you will notice, therefore less eye strain. The horizontal and vertical scan rates combine to provide the ability to produce high resolution, flicker-free images.
Flicker is caused by untimely fading of phosphor due to a slow vertical refresh.
And, even if your eyes don't pick up the flashing, your brain may, causing headaches, eye strain and fatigue. The standard refresh rate for a flicker-free display is a vertical scan rate of 75Hz or higher. Dot pitch relates directly to the image quality of a monitor. It's the measurement of the diagonal distance between two phosphors of the same color. For example, the diagonal distance from a red phosphor dot to the next red phosphor dot.