Difference between Beam Penetration and Shadow Mask method 

1. Beam Penetration Method :
Beam Penetration Method is quite similar to the normal CRT and it uses only one electron gun. In this, different colors of multi-layered are coated on inner surface of screen, normally the two layers of phosphorus i.e., red and green are coated. It is a method used for displaying color pictures that has been used with random scan monitors.

2. Shadow Mask Method :
Shadow Mask Method is the method which is used in raster scan system which includes color TVs. In this the pixel is made up of three -colors. So due to three colors it uses three electron guns one for producing each color. The colors are red, green and blue. In this the important consideration for a color monitor is the setting of electron guns and the phosphor dots forming a pixel.