Beam Penetration Method in Random Scan Display | Computer Graphics

In this video, we will be discussing about the Beam penetration method in Computer graphics.

The Color CRT monitor displays, images using a combination of Phosphorous which emits different colored light. From the combination of emitted range of light, colors can be produced from different phosphors. 

There are 2 basic techniques for making a color display with a CRT:

• Beam-penetration method and 
• Shadow-mask method.

Shadow-Mask Method: It is a commonly used technique that uses a raster scan system. It produces a much wider range of colors compared to Beam penetration. In this, the pixel is made up of three – colors. Due to three colors it uses three electron guns one for producing each color, a phosphor dot emits a red color light, the second emits green light, and the third emits blue light. The CRT has three electron guns, one for each color point, and a shadow mask grid just behind the phosphor-coated screen.

Beam-penetration method: It is similar to normal CRT and it uses one electron gun. It displays color images by using random-scan monitors. It uses two layers of phosphors, red, and green which are coated on the inside of the CRT screen. The color depends on how far the electron beam penetrates Phosphor layers. These two combinations of two colors produces four-color red, green, orange, and yellow.

Features of Beam Penetration

• It produces four colors because of the speed of the electron gun.
• Here only one electron gun is used.
• It provides high resolution.
• It is cheaper than the shadow mask method.
• It is used in a random scan system to display color.