BAIT1003 Chapter 4


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Chapter 4: Output Devices

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BAIT1003 Chapter 4

  1. 1. BAIT1003 IT Fundamentals Chapter 4 Output Devices
  2. 2. Objectives Describe the types of output Describe the factors that affect the quality of an LCD monitor or LCD screen Explain the characteristics of various display devices Describe various ways to print Differentiate between a nonimpact printer and an impact printer
  3. 3. Objectives Summarize the characteristics of inkjet printers, photo printers, laser printers, multifunction peripherals, thermal printers, mobile printers, label and postage printers, and plotters and largeformat printers Describe the uses and characteristics of speakers, headphones, an d earbuds Identify the purpose and features of data projectors, interactive whiteboards, and forcefeedback game controllers and tactile output Identify output options for physically challenged users
  4. 4. What is Output?     Output is data that has been processed into a useful form called information. Computers generate several types of output, depending on the hardware and software being used and the requirements of the user. Output can be display or view on monitor, print it on a printer, or hear it through speakers, headphones or earphones. While working with a computer, a user encounters four basic types of output: text, graphics, audio, and video.
  5. 5. Output Examples
  6. 6. What is Output? Text • Text consists of characters that are used to create words, sentences, and paragraphs. A character is a letter, number, or punctuation mark. Examples of text-based outputs: • memos, letters, press releases, reports, advertisements, newsletters, envelope s, mailing labels and email messages.
  7. 7. What is Output? Graphic • digital representations of non-text information such as drawings, charts, & photographs. It also can be animated, giving them the illusion of motion. Documents often include graphics to enhance their visual appeal and convey information. Examples: • Business letters have logos • Reports include charts • Newsletters use drawings, clip art, and photographs.
  8. 8. What is Output? Audio    It is music, speech, or any other sound. Recall that sound waves, such as the human voice or music are analog. To store such sounds, a computer converts the sounds from a continuous analog signal into a digital format. Software programs such as games, encyclopedias, and simulations often have musical accompaniments for entertainment and audio clips, such as narrations and speeches, to enhance understanding.
  9. 9. What is Output? Video    It consists of full-motion images that are played back at various speeds. Video often is captured with a video input device such as video camera. As with audio, software and Web sites often include video clips to enhance understanding. Examples: Users watch a live news report, view a replay while attending a live sport event.
  10. 10. What is Output Devices? An output device is any hardware components that convey information to one or more people. Commonly used output devices include: 1. Display Devices 2. Printers 3. Multifunctional Peripherals 4. Speakers, Headsets and Earbuds 5. Data Projectors 6. Interactive Whiteboards 7. Force feedback Game Controllers and Tactile Output
  11. 11. Display Devices  It is an output device that visually text, graphics, and video information.    conveys Information on a display device often is called soft copy, because the information exists electronically and is displayed for temporary period of time. Display devices consist of a screen and the components that produce the information on the screen. Most display devices show text, graphics, and video information in color. Some, however, are monochrome. Monochrome means the information appears in one color.
  12. 12. Display Devices Two types of display devices are Flat-panel display and CRT monitors. Flat-panel display is a lightweight display device with shallow depth and flat screen that typically uses LCD (liquid crystal display) or gas plasma technology. The term, flat screen, means the screen is not curved.  Types of flat panel displays include: 1. LCD monitors 2. LCD screens 3. Plasma monitors.
  13. 13. Mobile devices with LCD screen
  14. 14. Display Devices – LCD Monitors & Screens It is a desktop monitor that uses a liquid crystal display to produce images. These monitors produce sharp, flicker-free images. LCD Advantages and uses  LCD monitors have a small footprint; that is they do not take up much desk space. For additional space savings, some LCD monitors are wall mountable.  Mobile computers, such as notebook computers and tablets PC, and mobile devices, such as portable media players, and smart phone, often have built in LCD screen. 
  15. 15. Display Devices – LCD Monitors & Screens LCD Technology  LCD monitors and screens produce color using either passive matrix or active matrix technology. Active Matrix Passive Matrix Display uses a separate transistor to apply charges to each liquid crystal cell and thus displays highquality color that is viewable from all angles. Display uses fewer transistors and requires less power, and is less expensive than active-matrix display. The color on a passive matrix display often is not as bright as an active matrix. Users view images on a passive matrix display best when working directly in front of it.
  16. 16. Display Devices – Plasma Monitors • A plasma monitor is a display device that uses gas plasma technology, which sandwiches a layer of gas between two glass plates. When voltage is applied, the gas releases ultraviolet (UV) light. This UV light causes the pixels on the screen to glow and form an image. • Plasma monitor offer screen sizes up to 150 inches wide and richer color than LCD monitors but are most expensive. • Like LCD monitors, plasma monitors can hang directly on a wall.
  17. 17. Display Devices – Plasma Monitors • Plasma monitor offer screen sizes up to 150 inches wide and richer color than LCD monitors but are most expensive.
  18. 18. Display Devices – Televisions Home users sometimes use their television as a display device. Connecting a computer to an analog television requires a converter that translates the digital signal from the computer into an analog signal that the television can display. Digital television signals provide two major advantages over analog signals there are: Digital signals produce a higher quality picture. Many programs can be broadcast on a single digital channel.
  19. 19. Display Devices – Televisions • HDTV (high definition television) is the most advanced form of digital television, working with digital broadcast, transmitting digital sound, supporting wide screen and higher resolution display than a standard television set.
  20. 20. Display Devices – Televisions • With HDTV, the broadcast signals are digitized when they are sent via satellite or cable. A decoder in your home receives the signal and sends it into the HDTV display.
  21. 21. Display Devices – CRT Monitors  CRT monitor is a desktop monitor that similar to a standard television set because it contains a cathode-ray tube (CRT).   CRT is a large, sealed glass tube. The front of the tube is the screen. Tiny dots of phosphor material coat the screen on a CRT. Inside the CRT, an electron beam moves back and forth across the back of the screen . This causes the dots on the front of the screen to glow, which produces an image on the screen.
  22. 22. Display Devices – CRT Monitors   CRT monitors have a much larger footprint than do LCD monitors; that is take up more desk space. A CRT monitor costs less than an LCD monitor, but it also generates more heat and use more power than an LCD monitor.
  23. 23. Printers   Printer is an output device that produces text and graphics on a physical medium such as paper or transparency film. Printed information, is called hard copy, exists physically and is a more permanent form of output than that presented on a display device (soft copy).  Hard copy, also called a printout, can be printed in portrait or landscape orientation. portrait landscape
  24. 24. Printers Examples
  25. 25. Printers – Nonimpact Printers • A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper. – Examples: Spray ink, use heat or pressure to create image. • Commonly used nonimpact printers are: – Ink jet printer, Photo printer, Laser printer, Thermal printer, mobile printer, label and postage printer, plotters, and large format printer.
  26. 26. Nonimpact Printers – Ink-jet Printer   An ink-jet printer is a type of non-impact printer that forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper. This printers can produce letter-quality text and graphics in both black &white and color on various materials such as envelopes, labels, transparencies, & iron-on T-shirts transfers, as well as a variety of paper types.
  27. 27. Nonimpact Printers – Ink-jet Printer Printer resolution • One factor that determines the quality of an ink-jet printer is its resolution. Printer resolution is measured by the number of dots per inch (dpi) a printer can print. The higher the dpi, the better the print quality.
  28. 28. Nonimpact Printers – Ink-jet Printer    Most ink-jet printer can print from 1200 to 4800 dpi. The speed of an ink-jet printer is measured by the number of pages per minute (ppm). Mostly, they can print from 12 to 36ppm.
  29. 29. Nonimpact Printers – Ink-jet Printer print head print cartridge firing chamber ink dot bubble resistor ink nozzle Step 1. A small Step 2. The Step 3. Ink drops resistor heats the ink, causing the ink to boil and form a vapor bubble. vapor bubble forces the ink through the nozzle. onto the paper. Step 4. As the vapor bubble collapses, fresh ink is drawn into the firing chamber.
  30. 30. Nonimpact Printers – Photo Printer   Photo Printer is a color printer that produces photo-lab-quality pictures. With models that can print lettersized documents, users connect the photo printer to their computer and use it for all their printing needs, and this type of photo printer is ideal for the home or small business users.
  31. 31. Nonimpact Printers – Photo Printer   Many photo printers have a built-in card slot so the printer can print digital photographs directly from a media card. Some photo printers have a builtin LCD color screens, allowing users to view and enhance the pictures before printing them.
  32. 32. Nonimpact Printers – Laser Printer   A laser printer is a high-speed, high quality non-impact printer. When printing a document, laser printers process and store the entire page before they actually print it. Storing a page before printing requires that the laser printer has a certain amount of memory in the devices. Laser printers use software that enables them to interpret a Page Description Language (PDL) which tells the printer how to layout the contents of a printed page.
  33. 33. Nonimpact Printers – Laser Printer Highspeed Blackandwhite Laser printer Color Highquality
  34. 34. Nonimpact Printers – Laser Printer Laser printer features  A laser printer creates images using laser beam and powdered ink, called Toner.  Laser printers print text and graphics in high-quality resolutions, usually 1200dpi for black-and-white printers and up to 2400dpi for color printers.  Printing speed of a laser printer for home and small office users: Black-and-white text – 15 to 62ppm, Color text – 8 to 40ppm. Printing speed of a laser printer for large business users is more than 150ppm.
  35. 35. How does a laser printer work?
  36. 36. Nonimpact Printers – Multifunction Peripherals • A multifunction peripheral (MFP) is a single device that prints, scans, copies, and in some cases, faxes. Sometimes called an all-in-one device. • Advantage: – Less space than having a separate individual device. – Significantly less expensive than purchase each device separately. • Disadvantage: – If the device break down, loss all four functions.
  37. 37. Nonimpact Printers – Multifunction Peripherals
  38. 38. Nonimpact Printers – Thermal Printer    It generates images by pushing electrically heated pins against heat- sensitive paper. It is an inexpensive, but the print quality is low and the images tend to fade over time. Example:  Point-of-sale terminal in retail and grocery stores print purchase receipts on the thermal paper.
  39. 39. Nonimpact Printers – Thermal Printer Two special types of thermal printers have a very high print quality and can print at much faster rates are: Thermal wax-transfer printer Generates rich, nonsmearing images by using heat to melt colored wax onto heat-sensitive paper. It is more expensive than ink-jet printers, but less expensive than many color laser printers. Dye-sublimation printer (or digital photo printer) Use heat to transfer colored dye to specially coated paper. It can create images that are of photographic quality.
  40. 40. Nonimpact Printers – Mobile Printer    Mobile printer is a small, lightweight, batterypowered printer that allows a mobile user to print from a laptop, smart phone, PDA while travelling. Mobile printers mainly use ink-jet, thermal, thermal wax-transfer, or dye-sublimation technology. Many of these printers connect to a parallel port or USB port.
  41. 41. Nonimpact Printers – Label & Postage Printer   Label printer is a small printer that prints on an adhesive-type material that can be placed on variety of items such as floppy disks, CDs, DVDs, audiocassettes, photographs, toys and bar codes. Postage printer is a special type of label printer that has a built-in digital scale and prints postage stamps
  42. 42. Nonimpact Printers – Plotters & Large-format Printer   Plotters are sophisticated printers used to produce high quality drawings such as blueprints, maps, and circuit diagrams. These printers are used in specialized fields such as engineering and drafting and usually are very costly. Large-format printer creates photorealistic-quality color prints. Graphic artists use these high-cost, highperformance printers for signs, posters and other professional quality display.
  43. 43. Printers – Impact Printers • Impact printer forms characters and graphics on piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper. – It is noisy because of striking activity. – Produce near letter quality output, which is print quality slightly less clear. – Ideal for printing multipart forms because they easily print through many layers of paper. • Two commonly types: 1. dot-matrix 2. line printer
  44. 44. Impact Printers – Dot-matrix Printer   A Dot-Matrix printer is an impact printer that produces printed images when tiny wire pins on a print head mechanism strikes an inked ribbon. When the ribbon presses against the paper, it creates dots that form characters and graphics. Most dot-matrix printers use continuous-form paper, in which each sheet of paper is connected together. The pages generally have holes punched along two opposite sides so the paper can be fed through the printer.
  45. 45. Impact Printers – Dot-matrix Printer
  46. 46. Impact Printers – Dot-matrix Printer Dot-matrix printer features:   The print head mechanism on a dot-matrix printer can contain 9 to 24 pins, depending on the manufacturer and the printer model. A higher number of pins mean the printer prints more dots per character, which result in higher print quality. The speed of a dot-matrix printer is measured by the number of characters per second (cps) it can print. The speed of dot matrix printers ranges from 375 to 1100 characters per second (cps), depending on the desired print quality.
  47. 47. Impact Printers – Line Printer    A line printer is a high-speed impact printer that prints an entire line at a time. The speed of a line printer is measured by the no. of lines per minute (lpm) it can print. Some line printers print as many as 3000 lpm. Mainframes, servers or networked applications, such as manufacturing, distribution or shipping often use line printers.
  48. 48. Speaker, Headphones & Earbuds    An Audio output device is a component of a computer that produces music, speech or other sounds, such as beeps. Three commonly used audio output devices are: 1. Speakers 2. Headphones 3. Earbuds Most PC has a small internal speaker that usually outputs only low quality sound. Thus, many users add stereo speakers to their computers to generate a higher-quality sound.
  49. 49. Speaker, Headphones & Earbuds
  50. 50. Speaker, Headphones & Earbuds    Most speakers have tone and volume controls, allowing users to adjust settings. To boost the low bass sounds, some users add a woofer (also called a subwoofer). Users connect the stereo speakers and subwoofer to ports on the sound card. With the headphones or earphones, only the individual wearing the headphones or earphones hears the sound from the computer. The difference is that headphones cover or are placed outside of the ear, whereas earbuds or earphones rest inside the ear canal.
  51. 51. Other Output Devices • Other output devices are available for specific uses and applications Data projectors Interactive whiteboards Force-feedback game controllers Tactile output
  52. 52. Other Output Devices – Data Projectors   Data Projector is an output device takes the image from a computer screen and projects it onto a larger screen so that the audience can see the image clearly. It can be a large device attached to a ceiling or wall in an auditorium, or they can be small portable devices.
  53. 53. Other Output Devices – Data Projectors Two types of smaller, lower cost units are: LCD Projector It using liquid crystal display technology, attaches directly to a computer and uses its own light source to display the information shown on the computer screen. DLP Projector (Digital Light Processing) Its use tiny mirrors to reflect light, producing crisp, bright, colorful images that can be seen clearly even in a well-lit room. DLP projector produces sharper and brighter images than LCD projector.
  54. 54. Other Output Devices – Data Projectors
  55. 55. Other Output Devices – Interactive Whiteboards    An interactive whiteboard is a touch sensitive device, resembling a dry erase board that displays the image on a connected computer screen. A presenter controls the computer program by clicking a remote control, touching the whiteboard, drawing on or erasing the whiteboard with a special digital pen and eraser, or writing on a special tablet. Interactive whiteboards are used frequently in classroom as a teaching tool, during meeting as a collaboration tool, and to enhance delivery of presentation.
  56. 56. Other Output Devices – Interactive Whiteboards
  57. 57. Other Output Devices – Force-Feedback Game Controllers Game controllers with force-feedback such as:  Steering wheel to feel the sliding movement  Joystick to feel the forward movement of a simulated helicopter flying  Pedals to feel the shift in speed
  58. 58. Other Output Devices – Tactile Output Tactile output  Feature include with some input devices that provides the user with a physical response from the device.  Example: User may sense a bumping feeling on their hand while scrolling through a smart phone’s contact list.
  59. 59. Factors for Output Device Selection Output devices should be selected to meet specific user and business requirement. Factor 1: Select categories of output  Text documents including reports, letters, etc.  Graphics charts, graphs, pictures  Multimedia combination of text, graphics, video, audio
  60. 60. Factors for Output Device Selection Factor 2: Speed of an output device • • The speed at which output is required may critical. For example: – – To print a large volume of data, a laser printer might be most suitable to finish the work more quickly. If a single enquiry is required, it may be quicker to read from a display devices.
  61. 61. Factors for Output Device Selection Factor 3: The suitability of the output devices to the application • It will usually be clear which method is suited to a particular application, as the characteristics of each are very different. • For example: – Display device  visually conveys text, graphics, and video information. – Plotters used to produce high quality drawings such as blueprints and maps – Speaker  to generate a higher-quality sound.
  62. 62. Factors for Output Device Selection Factor 4: Volume of information produced • Volume of information produced may affect the choice • For example: – Display device can hold a certain amount of data, but it becomes more difficult to read when information ' goes off ' screen and can only be read ' a page' at a time. – Printer can print large amount of data on paper and it is more permanent than that presented on a display device.
  63. 63. Summary • This chapter described the various methods of output and several commonly used output devices.