This is why faster the scan rates provide brighter and more distinct pictures. Dot pitch is the distance between a red, green, or blue dot and the closest other red, green, or blue dot on a color monitor expressed in millimeters. A monitor with a 640x480 display will have 307,200 pixels composed of three dots each or 307,200 red dots, and the same number of blue and green. The lower the dot pitch, the crisper the image. A Sony monitor with a 0.25 dot pitch has a crisper picture than another more common 0.28 dot pitch monitor.
Dot pitch is often the reason why a computer monitor is so expensive or so cheap.
The .32 dot pitch on a larger monitor provides a significantly poorer picture at the same resolution than a .28 dot pitch on the 15-inch monitor. The resolution on many applications is so poor as to make the monitor painful to watch. Be careful making comparisons on partial data, it is easy to be mislead. There are even larger sizes for desktop monitors and smaller ones for the portable computer and flat screen displays. If you look closely at your monitor, you will notice a black line between the viewable picture and the plastic frame that you measure your picture tube size from.