1. Beam Penetration & Shadow Mask Method

2. To be discussed… Beam Penetration Method
Properties of Beam Penetration Method
Shadow Mask Method
Properties of Shadow Mask Method

3. Beam Penetration Method

4. Beam Penetration Method
Two layers of phosphor (red and green) are coated onto the inside of the CRT screen.
The display color depends on how far the electron beam penetrates into the phosphor layers.

5. Beam Penetration Method
The speed of the electrons, and the screen color at any point, is controlled by the beam acceleration voltage.
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6. Beam Penetration Method
Properties:
Used with random scan monitors.
Only four colors are possible (red, green, orange, and yellow).
Quality of pictures is not as good as with other methods.
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7. Shadow Mask
Method

8. Shadow Mask Method The color CRT has:
Three color phosphor dots (red, green and blue) at each point on the screen.
Three electron guns, each controlling the display of red, green and blue light.

9. Shadow Mask Method

10. Shadow Mask Method
We obtain color variations by varying the intensity levels of the three electron beam.
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11. Shadow Mask Method Properties:
Used in raster scan system (including color TV).
Million different colors are produced.
Picture quality is very good.
Designed as RGB monitors.

12. Shadow Mask Method
High quality raster graphics system have 24 bits per pixel in the frame buffer (a full color system or a true color system)
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13. Thankyou
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