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Output Devices UoS Fsd

Output Devices Introduction & details
Arbab Raza M.Sc I.T 2nd

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Output Devices UoS Fsd

  1. 1. Introduction To ICT M.Sc. Semester 1st Course Instructor: Mr. Waseeq Ul Islam Assignment: Output Devices M.Sc I.T 1st UoS Lyallpur Campus Faisalabad
  2. 2. GroupMembers: Arbab Raza Hasan Nawaz Humaira Nazir Inam Ul Haq University of Sargodha, Lyallpur Campus, Faisalabad M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 3
  3. 3. Objective Overview Describe the types of output Explain the characteristics of various display devices Describe various ways to print Differentiate between a nonimpact printer and an impact printer M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 4
  4. 4. What Is Output? Output is data that has been processed into a useful form M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 5
  5. 5. 6 M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 6
  6. 6. Output Devices Output Devices are all part of the Hardware of a computer system Output Devices are about seeing the results of your work! M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 7
  7. 7. Output Devices M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 8 Display devices Printers Speakers, headphones, and earb uds Data projectors
  8. 8. 9 Some Output Devices Video Monitor Sound Paper M.Sc I.T 1st UoS Lyallpur Campus Faisalabad
  9. 9. Display Devices • The graphics processing unit (GPU) controls the manipulation and display of graphics on a display device • LCD monitors use a digital signal and should plug into a DVI port, and HDMI port, or Display Port M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 10
  10. 10. 11 Types of Output • Soft Copy • Hard Copy • Communications Channel M.Sc I.T 1st UoS Lyallpur Campus Faisalabad
  11. 11. Screen Output – Soft Copy • Video Monitor • Also called Video Display Terminal (VDT) • Image exists in video memory—VRAM • Monitor size is measured diagonally across the screen 12M.Sc I.T 1st UoS Lyallpur Campus Faisalabad
  12. 12. M.Sc I.T 1st UoS Lyallpur Campus Faisalabad Pixels • Images are made up of dots called pixels for picture elements • The number of pixels determines clarity of the picture on the screen • More pixels = higher resolution = clearer picture 13
  13. 13. 14 Pixels M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 14
  14. 14. M.Sc I.T 1st UoS Lyallpur Campus Faisalabad Color Depth (Bit Depth) • This means the amount of information stored in each pixel about what is being shown on the monitor • Monochrome (1 bit of information per pixel) • This can only be black or white • Gray-scale (8 bits of information per pixel) • This can show more shades of grey • True color (24 or 32 bits of information per pixel) • This can realistically reproduce a photograph on the screen that looks very close to the original 15
  15. 15. Examples of Color Depth 1-bit depth 4-bit depth 8-bit depth 16-bit depth The greater the color depth the more colours that can be represented on the screen 16M.Sc I.T 1st UoS Lyallpur Campus Faisalabad
  16. 16. CRT (cathode ray tube) LCD (liquid crystal display) Classes of Monitors M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 17
  17. 17. CRT (Cathode Ray Tube) • A CRT is a television-style monitor • Its features include: • Clear image • Quick response time • Low cost • Very popular M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 18
  18. 18. Monitor Specifications • Screen size – The diagonal measurement in inches (15, 17, 19, 21) • Resolution – The sharpness of image determined by the number of dots (pixels) that the screen can display (800 x 600, 1024 x 768, 1600 x 1200) • Refresh rate – The speed at which the screen is refreshed and measured in Hertz (Hz) (60Hz, 75Hz) M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 19
  19. 19. Features of CRT Displays • Display text and graphics • Monitors differ in resolution • Standards • SVGA – 1024 x 768, 1208 x 1024 and 1600 x 1200 • XGA – has same resolutions but supports more colours • Screen sizes vary from 15” to 21” M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 20
  20. 20. LCD (Liquid Crystal Display) • LCDs comprise flat-panel monitors • Found on watches, calculators, digital cameras and notebook computers • Lighter weight • Crisp,clear images • Extra viewing area for same size • More expensive to buy • Consume less power M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 21
  21. 21. Paper Output – Hard Copy • A printer is a device that produces output on paper • Most printers today can produce both text and graphics • Two types of printers: • Impact printers • Non-impact printers M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 22
  22. 22. Impact Printers • There is some physical contact with the paper to produce the image ie physically striking the paper • Types • Line printers • Dot matrix printers M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 23
  23. 23. Line Printer • Line printers • Used by mainframes for jobs that need a large volume of printing • Limited characters available • Print an entire line at a time • Cheap to run • Not high quality M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 24
  24. 24. Dot Matrix Printer • Have a print head made up of columns of pins • The pins form characters and images as patterns of dots produced when the pins strike the paper • Reasonable quality text and graphics • Inexpensive to buy and run • Noisy M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 25
  25. 25. • A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper Ink-jet printers Photo printers Laser printers Thermal printers Mobile printers Label and postage printers Plotters Non-Impact Printers M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 26
  26. 26. Ink-Jet Printers • Ink-jet • Dots of ink are sprayed onto the paper to form the image • Reasonably high quality • Available in color or B/W • Reasonably priced • Expensive to run • Speed measured in pages per minute M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 27
  27. 27. Photo Printers A photo printer produces color photo-lab-quality pictures • Most use ink-jet technology • PictBridge allows you to print photos directly from a digital camera • Print from a memory card and preview photos on a built-in LCD screen M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 28
  28. 28. Laser Printers • Laser printers • Image transferred to paper with a laser beam • Faster and more expensive than dot-matrix • High-resolution output • Expensive to buy • Quite expensive to run M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 29
  29. 29. Thermal Printers Thermal wax- transfer printer Dye-sublimation printer • A thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 30
  30. 30. Mobile Printer • A mobile printer is a small, lightweight, battery-powered printer that allows a mobile user to print from a notebook computer, smart phone, or other mobile device M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 31
  31. 31. Label Printer • A label printer is a small printer that prints on adhesive-type material • A postage printer prints postage stamps • Postage also can be printed on other types of printers M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 32
  32. 32. Plotters • Used by graphic designers/architects • Image transferred to paper with ink pens • Very high resolution • Excellent for scientific and engineering applications M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 33
  33. 33. Printing Terms • Dots per inch (dpi) • Pages per minute (ppm) • Characters per second (cps) • Laser printers – 50 ppm • Ink-jet printers – 12 ppm M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 34
  34. 34. Output You Can Hear • Synthesizers can be used to generate music and sounds • Many computers have synthesizers • Sound cards have built-in synthesizers M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 35
  35. 35. 36M.Sc I.T 1st UoS Lyallpur Campus Faisalabad Speakers, Headphones, and Ear buds • An audio output device produces music, speech, or other sounds Most computer users attach speakers to their computers to: • Generate higher-quality sounds for playing games • Interact with multimedia presentations • Listen to music • View movies
  36. 36. Speakers, Headphones, and Ear buds • Headphones are speakers that cover or are placed outside of the ear • Ear buds (also called earphones) rest inside the ear canal Discovering Computers 2011: Living in a Digital World Chapter 6 37M.Sc I.T 1st UoS Lyallpur Campus Faisalabad
  37. 37. Speakers, Headphones, and Ear buds • Some speakers are specifically designed to play audio from a portable media player • Wireless speakers 38M.Sc I.T 1st UoS Lyallpur Campus Faisalabad
  38. 38. Speakers, Headphones, and Ear buds Voice output occurs when you hear a person’s voice or when the computer talks to you through the speakers • Some Web sites dedicate themselves to providing voice output • Often works with voice input • VoIP uses voice output and voice input 39M.Sc I.T 1st UoS Lyallpur Campus Faisalabad
  39. 39. Other Output Devices • A data projector is a device that takes the text and images displaying on a computer screen and projects them on a larger screen • LCD projector • Digital light processing (DLP) projector 40M.Sc I.T 1st UoS Lyallpur Campus Faisalabad
  40. 40. M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 41 Thank You

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