2/1 A Look at Monitors Roll call Video: monitors Step-by-step lecture

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1: the DAC & Video Card CPU sends info to the DAC DAC: Digital-to- Analog Converter

2A: How many colors are there? Namecolors possiblemode Standard VGA164 bit 256 color mode2568 bit High Color65,53616 bit True Color16,777,21624 bit

3. Sending it to the monitor 3 electron guns –RED, GREEN, BLUE CRT: “Cathode Ray Tube” video card’s signals tell the intensity needed for each gun

4. The magnetic yoke The magnetic deflection yoke bends the electron beams from the guns.

4A. Terms Resolution: # pixels displayed horizontally and vertically Refresh rate: how quickly the image is redrawn

5. Only the Shadow (Mask) knows... Purpose: to keep the electron beams sharp and on target.

5. Only the Shadow (Mask) knows... Dot pitch: distance from one hole’s center to another.

5. Only the Shadow (Mask) knows... Aperture Grille: “Stripe Pitch” -- distance from center of column to the next.

5. Only the Shadow (Mask) knows... Slot Mask: “Stripe Pitch” -- distance from center of column to the next.

6. The Phosphors Material that glows. Different type for each color. “Persistence”: phosphor keeps glowing after electron beam leaves.

7. Raster scanning “Raster”: the area that is hit by the electron beams. Line by line. each line is called a scan line.

8. Raster scanning “Field”: a complete sweep of the screen. “Refresh”: And do it again! Refresh rate usually at least 60 times per second.

9. The cheap way out. “Interlacing”: scan every OTHER line. Can be seen sometimes as a flicker.