The document discusses different types of display devices including CRT and plasma display panels. CRT uses an electron gun to direct an electron beam at phosphorescent dots on a screen to display images. Color CRT monitors use three electron guns and a shadow mask to activate red, green, or blue phosphor dots to produce color. Plasma display panels contain two glass plates separated by a gas that is electrically excited into plasma to stimulate phosphors and emit light for each pixel.

1. WELCOME

2. DISPLAY DEVICESThe display devices of the older times are called as vector displays.

3. The e important terms associated with display devices are:

4. Resolution: the maximum number of points the at can be displayed without overlap is called resolution.

5. Aspect ratio : this term gives the ratio of vertical pixel to the horizontal pixel.CATHODE RAY TUBE (CRT)

6. A beam of electrons is emitted by the electron gun . the beam passes through the various focusing and deflection systems.

7. The aim of the systems is to direct the beam to specified points on the screen. The screen is phosphorous coated.

8. The phosphorous has the property a beam strikes on the screen it emits small spot of light.

9. Redirecting the electron beam at certain interval by redrawing the picture.

10. Heat is supplied to the electron gun which causes an electron beam to be accelerated towards the phosphorous coated screen.

11. Control grid controls the intensity of the electron beam.

12. Electro static deflections are normally used in televisions & computers monitors.

13. The beam passes through two pair of metal plates.