Process of Producing Image on the Screen by a Color CRT Monitor:
A color CRT monitor has 3 electron guns at its back. These 3 guns fire 3 electron beams at once through a magnetic coil that aims the beams to the screen.
The screen is coated with a chemical called phosphors that glow when struck by electron beams. This phosphor coating is organized into grid of dots where smallest number of dots that can be focused by the magnetic coil at once is called pixel.
Each pixel in a color CRT monitor contains 3 phosphor dots which represents 3 primary additive colors red, green and blue.
The electron guns start shooting electron beams from the top-left corner and continue shooting until it reaches the end the of the row. Then the guns start shooting from the first pixel on the second row from top and continue shooting until it reaches the end of the second row of pixel. This process continues for all pixels. Then this process continues again and again.
The monitor can display different colors by combining different intensities of the 3 beams per dots per pixel.
