Color CRT Monitors 17-03-2020

Rabia Shahid · Post Color CRT Monitors 17-03-2020 Posting as GCW CS

A CRT monitor displays color pictures by using a combination of phosphors that emit different colored light. With the combination of phosphor a range of colors can be displayed. There are two techniques used in color CRT monitors:

1. Beam Penetration Method
2. Shadow Mask Method

Beam Penetration

Beam Penetration

In beam penetration method two layers of phosphor, usually coated onto the inside of the CRT screen, and the displayed color depend on how far the electron beam penetrates into the phosphor layers. At intermediate beam speeds, combinations of red and green light are emitted to show two additional colors, orange and yellow. Beam penetration is an inexpensive way to produce colors as only a few colors are possible and the quality of picture is also not impressive.

Shadow Mask

Shadow Mask

Shadow mask methods can display a wide range of colors. In this technique each pixel position is made up of three phosphor dots called triads as shown in the following figure. Three phosphor dots have different colors i.e. red, green and blue and the display color is made by the combination of all three dots. Three guns are used to throw beam at the three dots of the same pixel. By varying intensity at each dot a wide range of colors can be generated. A shadow-mask is used which has holes aligned with the dots so that each gun can fire beam to corresponding dot only.

Post settings Labels Published on 3/19/20, 1:29 AM Pacific Daylight Time Permalink Location Options