Cathode-Ray Tube

  There have been a number of very different technologies used to create a pixel. One of the first types of screen is a cathode-ray tube.

In the original cathode ray tube (CRT) technology, there is no individual component for a pixel. The inner surface of the screen is covered with phosphor, which is a material that emits light when electrons fall on it. An individual pixel is lit up by controlling the direction of the electron beam used. 

 Colour CRT displays have individual red, green and blue phosphors arranged so as to create an array of pixels.

1. Three emitters of electrons (for the red, green, and blue dots of the phosphor)

2. Electron beams

3. Focusing coils

4. Deflection coils

5. Connection of end anodes.

6. Mask for separating the rays for the red, green, and blue parts of the displayed image.

7. A layer of phosphor (screen) with red, green, and blue zones.

8. Close-up of the phosphor-coated inner side of the screen.