Explains the working of CRT,TFT etc.

1. Graphics Displays (CRT and LCD)
&
Display Adapters(Video Cards)

2. Components of VDU(Visual Display Unit )

3. Cathode-Ray Tubes(CRT)

4. CRT(Color)

5. CRT Explained
 1. Three Electron guns (for red, green, and blue
phosphor dots)
 2. Electron beams
 3. Focusing coils
 4. Deflection coils
 5. Anode connection
 6. Mask for separating beams for red,
green, and blue part of displayed image
 7. Phosphor layer with red, green, and blue zones
 8. Close-up of the phosphor-coated inner side of the
screen

6. Shadow Masking in Color CRT

7. Liquid Crystal Displays(LCD)

8. LCD

9. Video Display Adapter(Video Card)
Continue…
 A video card is a special printed circuit
board that plugs into motherboard.
 A video card is responsible for
displaying graphics on monitor.
 Display adapter consists:
* VDU memory.
* Circuitry which transfers the contents
of VDU memory on the screen.

10. Display Adapters
 Display Adapters refreshes the screen
50 to 70 times a second so that image
persists on the screen.
 Low refresh rates causes the screen to
flicker or snowing effect.

11. Types of Display Adapters
 Monochrome Adapter(MA)
 Color Graphics Adapter(CGA)
 Enhanced Graphics Adapter(EGA)
 Multicolor Graphics Adapter(MCGA)
 Video Graphics Adapter(VGA)