The document discusses different types of graphics displays and display adapters. It describes the key components of a cathode ray tube (CRT), including electron guns, electron beams, and a phosphor layer. It also mentions liquid crystal displays (LCDs) and explains that a video card plugs into the motherboard and is responsible for transferring contents of VDU memory to the screen to display graphics. The document lists different types of early display adapters like CGA, EGA, and VGA.

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)
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 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)