Phosphor Coating for Cathode Ray Tubes

Phosphor coating is a crucial component of cathode ray tubes (CRTs), which are used in devices like televisions and computer monitors. The coating is responsible for producing the colors and images that we see on the screen. Here, we will discuss where the phosphor coating is provided on the CRT:

Location of Phosphor Coating

The phosphor coating is provided on the inside surface of the CRT only. This is the surface that faces the electron gun, which is responsible for shooting electrons at the screen. When the electrons hit the phosphor coating, they excite the phosphors, causing them to emit light. This light is what produces the images and colors that we see on the screen.

Reasons for Coating on Inside Surface

There are several reasons why the phosphor coating is provided on the inside surface of the CRT:

1. Accessibility: The electron gun is located inside the CRT, which makes it easier to apply the coating to the inside surface.

2. Better Image Quality: Applying the coating to the inside surface ensures that the electrons hit the phosphors directly, producing a sharper and clearer image.

3. Protection: Coating the inside surface protects the phosphors from damage due to external factors such as heat, moisture, and dust.

Conclusion

In conclusion, the phosphor coating for cathode ray tubes is provided on the inside surface only. This is because it is more accessible, produces better image quality, and provides protection to the phosphors.