Explain color CRT moni tors ?

A CRT monitor displays color pictures by using a combination of phosphors that emit different colored light.
By combining the emitted light from the different phosphors, a range of colors can be generated.
Two techniques:

Display color pictures
Two layers of phosphors, usually red and green
A beam of slow electrons excites the outer red layer
Fast electron penetrates through the red layer and
excites the inner green layer
An intermediate beam speeds, combinations of red and green light

They produce a wider range of colors
Has three phosphor color dots at each pixel position
One emits red light, another emits green light, and the third emits a blue light
The three beams are deflected and focused as a group on to the shadow mask, which contains a series of holes aligned with a phosphor dot patterns.
When the three beams passes through a hole in the
shadow mask, they activate a dot triangle, which
appears as a small color spot on the screen.

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