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Shelly Cashman Series Discovering Computers

Shelly Cashman Series Discovering Computers. Output. WHAT IS OUTPUT?. Hard copy Printed Soft copy Displayed on screen Other types Audio Video. Four Basic Categories of OUTPUT?. Text Graphics Video Audio. TYPES OF OUTPUT. Text Data that has been processed to create Information

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Shelly Cashman Series Discovering Computers

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  1. Shelly Cashman SeriesDiscovering Computers Output

  2. WHAT IS OUTPUT? • Hard copy • Printed • Soft copy • Displayed on screen • Other types • Audio • Video

  3. Four Basic Categories of OUTPUT? • Text • Graphics • Video • Audio

  4. TYPES OF OUTPUT • Text • Data that has been processed to create Information • Reports • Internal Reports • External Reports

  5. TYPES OF OUTPUT • Graphics • Non-text pictorial information • Computer drawing and paint programs • Animation • Clip art Click to see Figure 4-36

  6. TYPES OF OUTPUT • Audio output • Words and music • Stereo speakers • Voice output • Voice synthesis

  7. TYPES OF OUTPUT • Video output • Video images captured with a video input device • Output device such as a computer monitor • HDTV Click to see Figure 4-37

  8. DISPLAY DEVICES • Monitors • Screen • CRT (cathode ray tube) • Specialized monitors Click to see Figure 4-38

  9. DISPLAY DEVICES • Monitors • Color monitors • Monochrome monitors • Gray scaling Click to see Figure 4-40

  10. CRT • Screen coated with tiny dots of phosphor • Each dot made up of Red, Blue, Green • Pixel – Picture Element • Electron beam causes phosphor elements to glow

  11. DISPLAY DEVICES • Flat panel displays • LCD • Liquid Crystal material between layers of film • Active matrix (TFT) – (OTFT) • Separate Transistor for each pixel • Passive matrix • Fewer transistor • Dual Scan • High Performance Addressing (HPA) • E-book • Web-Enabled devices • MS Tablet • Gas plasma • Used in large monitors Click to see Figure 4-41

  12. DISPLAY DEVICES • Resolution • Pixels (picture elements) • Dot pitch • .28 dp => .28 mm vertical between dots • Viewable area • 15 “ • 17 “ • Etc.. Click to see Figure 4-42

  13. DISPLAY DEVICES • Resolution • Rows x Columns • VGA - 640 x 480 • SVGA - 800 x 600 or 1,024 x 768 • High-end monitors – 1280 x 1024…1800 x 1400 • Refresh rate – time to redraw picture • Faster better • Interlaced vs Non-interlaced • 60+ Hertz Click to see Figure 4-43

  14. Video Cards • Must match monitors capabilities • 8bit , 24 bit cards – bit depth • Number of bits to represent color • 28 = 256 colors • 224 = 16.7 million colors • SVGA • 800 X 600 up to 1500 x 1200 • 16.7 million colors

  15. Video Cards • Other Adapters • MDA - bw • VGA – 16 – 256 colors • XGA – 256 – 65,000 colors • Video Card Memory • 800 X 600 16 bit color --- requires 1 MB • 1600 x 1200 24 bit color – requires 6 MB • EMR • Energy Compliant

  16. What are video standards? Video Electronics Standards Association (VESA) develops video standards Next Display Devices p. 6.11 Fig. 6-11

  17. What are various video card configurations? Next Display Devices p. 6.11 Fig. 6-12

  18. Television • NTSC converter needed for standard TV’s • HDTV • Interactive TV

  19. DISPLAY DEVICES • How images are displayed on a monitor • Image is sent from the CPU to the video circuits • Red, Blue, Green electron gun • The shadow mask aligns beams of electrons • The yoke moves electron beams across and down the screen • Illuminated phosphor dots create the image Click to see Figure 4-44

  20. What is a printer? Output device that produces text and graphics on paper Result is hard copy, or printout Two orientations portrait orientation landscape orientation Next Printers Click to view animation p. 6.12 Fig. 6-14

  21. PRINTERS • Two groups • Impact • Nonimpact • Internet Printing

  22. IMPACT PRINTERS • Printing mechanism strikes paper, ribbon and character together • Letter Quality – LQ • Near Letter Quality - NLQ • Usually use continuous-form paper Click to see Figure 4-45

  23. IMPACT PRINTERS • Dot matrix printers • Small dots form characters • With personal computers, have a single print head • With large computers, have fixed print mechanism

  24. IMPACT PRINTERS • Dot matrix printers • Varying number of pins on the print head • 9-pin heads • 24-pin heads Click to see Figure 4-46 & 47

  25. IMPACT PRINTERS • Dot matrix printers • Varying number of pins on the print head • 9-pin heads • 24-pin heads • Speed • Characters per second (cps) • 300 – 1100 cps

  26. IMPACT PRINTERS • Line Printers • Band printers • Horizontal, rotating band containing characters • Bands are interchangeable • Shuttle Matrix • Print hammers move back and forth • Lines per minute (lpm) • Up to 3000 lpm Click to see Figure 4-48

  27. NONIMPACT PRINTERS • No mechanism strikes the paper • Used on all sizes of computers

  28. NONIMPACT PRINTERS • Ink-jet printers • Spray tiny drops of ink onto the paper • Color ink-jet printers • 300 – 2400 dpi • Speed measured in ppm Click to see Figure 4-50

  29. NONIMPACT PRINTERS • Laser printers • Operates much like a copy machine • High-quality text or graphics output • 600 – 2400 Dots per inch (dpi) • High-speed laser printers • Pages per minute (ppm) • Page Description Language (PDL) • Post Script - DTP • PCL - Office Printing Animation

  30. NONIMPACT PRINTERS • Thermal printers (thermal transfer printers) • Transfer color inks from ink sheets onto the printer surface • Wax transfer • Melted colored wax • Dye sublimation • Heat transfer of a colored dye Click to see Figure 4-54

  31. Speed Color Multiple Copies Type of paper Compatibility Budget Photographic Quality Cost of Operation Buying A Printer

  32. PRINTERS • Plotters • Pen plotters • Flatbed plotter • Drum plotter • Electrostatic plotters • Electrostatic wires –(styli) • Charges specially coated paper • Fuses toner to the pattern • High quality • Fast output

  33. PRINTERS • Special-purpose printers • Photo Printers • Single label printers • Bar code label printers • Portable printers Click to see Figure 4-57

  34. OTHER OUTPUT DEVICES • Data projectors • LCD projection panels • LCD projectors • Digital Light Processing (DLP) projectors Click to see Figure 4-59

  35. OTHER OUTPUT DEVICES • Computer output microfilm (COM) • Records output from a computer as microscopic images on a roll or sheet of film • Microfiche • Very fast • Low recording cost • Less space • Low storage cost Click to see Figure 4-60

  36. OTHER OUTPUT DEVICES • Audio • Speakers • Headphones • Voice • Synthesized • Authentic • Facsimile (fax) • Used to transmit and receive an image of a document over a phone line • Fax Modem • OCR Software Click to see Figure 4-61

  37. OTHER OUTPUT DEVICES • Multifunction devices (MFD) • Can print, scan, copy and fax • Less space • Lower cost than separate units • Terminals • Dumb terminals • Intelligent / Programmable terminals • Point of Sale (POS) • Automatic Teller Machines (ATM) Click to see Figure 4-62

  38. Output for Physically Challenged • Accessibility Properties on Control Panel • Visual Signals where sound would normally be used • Increased Font Size • Color selections • Braille printers

  39. Chapter 5 Complete

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