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Sunday, August 2, 2009

Output Devices

Monitors
   - Cathode ray tube (CRTs)
   - Liquid crystal displays (LCDs)
   - Quality of display
     - Resolution
     - Dot pitch

Touch screens
   - Input and output via display device

Printers
- Speed and resolution
   - Pages per minute
   - Dots per inch
     - Number of ink dots to fill a square inch
     - Higher DPI the greater the page clarity
- Impact
   - Create image by striking paper and ribbon
   - Dot-matrix
- Non-impact
   - Create image by spraying or rolling ink on the page

Non-impact Printers


- Ink-jet technology printers
   - Spray ink on the paper
   - Small
   - Quiet
   - Color is readily and cheaply available
- Laser printers
   - Laser heats drum which rolls ink (toner) on paper
   - Can be faster than ink-jet
   - Color more expensive than ink-jet



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