12.1  Input Devices <ul><li>An  input device  is the hardware that allows users to enter data into a computer and converts...
<ul><li>Keyboards </li></ul><ul><ul><li>Allow users to enter data or commands into a computer by pressing its keys. </li><...
<ul><li>Pointing Devices </li></ul><ul><ul><li>Allow users to control a cursor of a pointer on a  graphical user interface...
<ul><li>Pointing Devices </li></ul><ul><ul><li>Mice </li></ul></ul><ul><ul><ul><li>Use a multidirectional mechanism to reg...
<ul><li>Pointing Devices   </li></ul><ul><ul><li>Mice </li></ul></ul>Mechanical mouse Optical mouse Top view Top view Bott...
<ul><li>Pointing Devices </li></ul><ul><ul><li>Trackballs </li></ul></ul><ul><ul><ul><li>Like an inverted mouse </li></ul>...
<ul><li>Pointing Devices </li></ul><ul><ul><li>Touchpads </li></ul></ul><ul><ul><ul><li>A touch-sensitive plate, usually f...
<ul><li>Pointing Devices   </li></ul><ul><ul><li>Track Points </li></ul></ul><ul><ul><ul><li>A small stick that looks like...
<ul><li>Pointing Devices </li></ul><ul><ul><li>Joysticks </li></ul></ul><ul><ul><ul><li>Designed for playing computer game...
<ul><li>Pointing Devices </li></ul><ul><ul><li>Touch screens </li></ul></ul><ul><ul><ul><li>A video display device that ha...
<ul><li>Pointing Devices </li></ul><ul><ul><li>Touch screens </li></ul></ul><ul><ul><ul><li>Widely used in: </li></ul></ul...
<ul><li>Pointing Devices </li></ul><ul><ul><li>Digitizing Tablets </li></ul></ul><ul><ul><ul><li>Also called a graphics ta...
<ul><li>Pointing Devices </li></ul><ul><ul><li>Handwriting Boards </li></ul></ul><ul><ul><ul><li>Designed for Chinese char...
<ul><li>Scanners </li></ul><ul><ul><li>Used to input text and graphics into computers </li></ul></ul><ul><ul><li>Project l...
<ul><li>Scanners </li></ul><ul><ul><li>Pattern of dots forms a bitmap image </li></ul></ul><ul><ul><li>The  resolution , m...
<ul><li>Scanners </li></ul><ul><ul><li>Can be used with  optical character recognition (OCR) software  to convert the text...
<ul><li>Optical Readers </li></ul><ul><ul><li>Read predetermined characters, marks or codes and translate them into digita...
<ul><li>Optical Readers </li></ul><ul><ul><li>Bar code readers </li></ul></ul><ul><ul><ul><li>A mini-scanner which capture...
<ul><li>Optical Readers </li></ul><ul><ul><li>Optical Mark Readers </li></ul></ul><ul><ul><ul><li>Used with  optical mark ...
<ul><li>Microphones </li></ul><ul><ul><li>Allow users to record sound into a computer. </li></ul></ul><ul><ul><li>Usually ...
<ul><li>Digital Cameras and Digital Video Cameras </li></ul><ul><ul><li>Digital cameras </li></ul></ul><ul><ul><ul><li>Use...
<ul><li>Digital Cameras and Digital Video Cameras </li></ul><ul><ul><li>Web cam </li></ul></ul><ul><ul><ul><li>Special typ...
<ul><li>Digital Cameras and Digital Video Cameras </li></ul><ul><ul><li>Digital video cameras </li></ul></ul><ul><ul><ul><...
<ul><li>Digital Cameras and Digital Video Cameras </li></ul><ul><ul><li>Digital video cameras </li></ul></ul><ul><ul><ul><...
12.2  Output Devices <ul><li>Output Devices </li></ul><ul><ul><li>Hardware that translates computer processes and informat...
<ul><li>Visual Display Units (VDU) </li></ul><ul><ul><li>Also called monitor </li></ul></ul><ul><ul><li>Allow a user to vi...
<ul><li>Visual Display Units (VDU) </li></ul><ul><ul><li>CRT monitor </li></ul></ul><ul><ul><ul><li>Size = diagonal length...
<ul><li>Visual Display Units (VDU) </li></ul>Resolution, dot pitch and contrast ratio of visual display units 12.2  Output...
<ul><li>Visual Display Units (VDU) </li></ul><ul><ul><li>LCD monitors </li></ul></ul><ul><ul><ul><li>Slimmer </li></ul></u...
<ul><li>Speakers </li></ul><ul><ul><li>Used to convert audio signals of a computer into sound </li></ul></ul><ul><ul><li>M...
<ul><li>Printers </li></ul><ul><ul><li>Produce text and graphics on a physical medium such as paper or transparency film. ...
<ul><li>Printers </li></ul><ul><ul><li>Dot-matrix printers </li></ul></ul><ul><ul><ul><li>Contain a print head made up of ...
<ul><li>Printers </li></ul><ul><ul><li>Inkjet Printers </li></ul></ul><ul><ul><ul><li>Form images by spraying tiny ink dro...
<ul><li>Printers </li></ul><ul><ul><li>Laser printers </li></ul></ul><ul><ul><ul><li>Use a laser beam to produce an electr...
<ul><li>Printers </li></ul><ul><ul><li>Laser printers </li></ul></ul><ul><ul><ul><li>Can produce high resolution printouts...
<ul><li>Printers </li></ul><ul><ul><li>Thermal printer </li></ul></ul><ul><ul><ul><li>Produces a printed image by selectiv...
<ul><li>Printers </li></ul><ul><ul><li>Plotters </li></ul></ul><ul><ul><ul><li>Used to create high-quality or large-format...
<ul><li>Multifunction Printers </li></ul><ul><ul><li>Include the functions of printing and communication. </li></ul></ul><...
<ul><li>Video Projectors </li></ul><ul><ul><li>Project the computer display onto a large screen </li></ul></ul><ul><ul><li...
<ul><li>Video Projectors </li></ul><ul><ul><li>LCD projector </li></ul></ul><ul><ul><ul><li>Use a built-in light source to...
<ul><li>Video Projectors </li></ul><ul><ul><li>LCD projector </li></ul></ul><ul><ul><ul><li>Use a built-in light source to...
12.3  Daily Applications of Input and Output Devices <ul><li>Point-of-sale (POS) Terminal </li></ul><ul><ul><li>Widely use...
<ul><li>Cheque deposit Machine </li></ul><ul><ul><li>Equipped with a touch screen and an ATM card reader </li></ul></ul><u...
<ul><li>SOHO </li></ul><ul><ul><li>SOHO =  small office home office </li></ul></ul><ul><ul><li>Working space is a big conc...
<ul><li>Conference Room </li></ul><ul><ul><li>Most essential equipment for presentations: video projector </li></ul></ul><...
<ul><li>Conference Room </li></ul><ul><ul><li>Most essential equipment for presentations: video projector </li></ul></ul><...
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ICTCoreCh12

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ICTCoreCh12

  1. 1. 12.1 Input Devices <ul><li>An input device is the hardware that allows users to enter data into a computer and converts the data into a computer-readable form. </li></ul><ul><li>Examples: </li></ul><ul><ul><li>Keyboards </li></ul></ul><ul><ul><li>Pointing devices </li></ul></ul><ul><ul><li>Scanners </li></ul></ul><ul><ul><li>Optical readers </li></ul></ul><ul><ul><li>Microphones </li></ul></ul><ul><ul><li>Digital cameras </li></ul></ul><ul><ul><li>Digital video cameras </li></ul></ul>
  2. 2. <ul><li>Keyboards </li></ul><ul><ul><li>Allow users to enter data or commands into a computer by pressing its keys. </li></ul></ul><ul><ul><li>Convert keystrokes into corresponding electrical signals that the computer can understand. </li></ul></ul><ul><ul><li>Contain keys for typing letters, numbers and punctuation as well as modifier keys such as ‘Shift’, ‘Ctrl’ and ‘Alt’. </li></ul></ul>12.1 Input Devices A MIDI keyboard for inputting musical instrument digital interface (MIDI) instructions A keyboard
  3. 3. <ul><li>Pointing Devices </li></ul><ul><ul><li>Allow users to control a cursor of a pointer on a graphical user interface (GUI) . </li></ul></ul><ul><ul><li>Trigger an action that sends a command to the computer. </li></ul></ul><ul><ul><li>A pointer is a small symbol on the screen. </li></ul></ul><ul><ul><ul><li>Appear as an I-beam, a block arrow or a pointing hand </li></ul></ul></ul>Select an item from a menu Move an item from one place to another Drag 12.1 Input Devices
  4. 4. <ul><li>Pointing Devices </li></ul><ul><ul><li>Mice </li></ul></ul><ul><ul><ul><li>Use a multidirectional mechanism to register its motion. </li></ul></ul></ul><ul><ul><ul><li>Control the movement of the screen pointer. </li></ul></ul></ul><ul><ul><ul><li>The buttons on the top are used to issue commands. </li></ul></ul></ul><ul><ul><ul><li>Scrolling wheel allows a user to move a document displayed up and down rapidly when viewing a long computer file. </li></ul></ul></ul><ul><ul><ul><li>Mechanical mouse has a ball on its underside and tracks the direction in which the ball is rolling. </li></ul></ul></ul><ul><ul><ul><li>Optical mouse has an optical sensor which detects its movement accurately. </li></ul></ul></ul>12.1 Input Devices
  5. 5. <ul><li>Pointing Devices </li></ul><ul><ul><li>Mice </li></ul></ul>Mechanical mouse Optical mouse Top view Top view Bottom view Bottom view Scrolling wheel 12.1 Input Devices
  6. 6. <ul><li>Pointing Devices </li></ul><ul><ul><li>Trackballs </li></ul></ul><ul><ul><ul><li>Like an inverted mouse </li></ul></ul></ul><ul><ul><ul><li>Roll the ball with your finger to control the screen pointer. </li></ul></ul></ul><ul><ul><ul><li>Base of a trackball remains stationary while operating </li></ul></ul></ul><ul><ul><ul><li>Saving space </li></ul></ul></ul>A trackball 12.1 Input Devices
  7. 7. <ul><li>Pointing Devices </li></ul><ul><ul><li>Touchpads </li></ul></ul><ul><ul><ul><li>A touch-sensitive plate, usually found on a notebook computer </li></ul></ul></ul><ul><ul><ul><li>Drag your fingertip on the surface of the touchpad to control the movement of the screen pointer. </li></ul></ul></ul><ul><ul><ul><li>Tap the pad = click the buttons on a mouse </li></ul></ul></ul>A touchpad 12.1 Input Devices
  8. 8. <ul><li>Pointing Devices </li></ul><ul><ul><li>Track Points </li></ul></ul><ul><ul><ul><li>A small stick that looks like an eraser tip of a pencil </li></ul></ul></ul><ul><ul><ul><li>Pressure-sensitive, allow users to move the pointer in the direction it is pushed </li></ul></ul></ul><ul><ul><ul><li>Usually positioned between the keys on the keyboard of a notebook computer </li></ul></ul></ul>A track point 12.1 Input Devices
  9. 9. <ul><li>Pointing Devices </li></ul><ul><ul><li>Joysticks </li></ul></ul><ul><ul><ul><li>Designed for playing computer games </li></ul></ul></ul><ul><ul><ul><li>Has a vertical lever that controls the movement of the pointer </li></ul></ul></ul><ul><ul><ul><li>Usually include trigger buttons for performing certain actions in computer games </li></ul></ul></ul>A joystick 12.1 Input Devices
  10. 10. <ul><li>Pointing Devices </li></ul><ul><ul><li>Touch screens </li></ul></ul><ul><ul><ul><li>A video display device that has a transparent, touch-sensitive layer </li></ul></ul></ul><ul><ul><ul><li>Send an electrical signal to the computer to indicate the location at which a finger or a stylus touches. </li></ul></ul></ul><ul><ul><ul><li>Users can interact with a computer by pressing and dragging icons of figures on a screen. </li></ul></ul></ul>12.1 Input Devices A handheld game console An information kiosk Applications of touch screen
  11. 11. <ul><li>Pointing Devices </li></ul><ul><ul><li>Touch screens </li></ul></ul><ul><ul><ul><li>Widely used in: </li></ul></ul></ul><ul><ul><ul><ul><li>Information kiosks in airports </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Libraries </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Shopping centres </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Personal digital assistants (PDAs) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Smart phones </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Handheld game consoles </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Notebook computers </li></ul></ul></ul></ul>12.1 Input Devices
  12. 12. <ul><li>Pointing Devices </li></ul><ul><ul><li>Digitizing Tablets </li></ul></ul><ul><ul><ul><li>Also called a graphics tablet </li></ul></ul></ul><ul><ul><ul><li>Allow users to draw and sketch directly into a computer. </li></ul></ul></ul><ul><ul><ul><li>Detect the movements and pressure of a pen-like stylus and converts the movements into digital signals. </li></ul></ul></ul><ul><ul><ul><li>Widely used in graphic design and engineering </li></ul></ul></ul>12.1 Input Devices A digitizing tablet
  13. 13. <ul><li>Pointing Devices </li></ul><ul><ul><li>Handwriting Boards </li></ul></ul><ul><ul><ul><li>Designed for Chinese character input </li></ul></ul></ul><ul><ul><ul><li>Consist of a pressure-sensitive board and a pen-like stylus </li></ul></ul></ul><ul><ul><ul><li>Must work with character recognition software to identify the sketches and convert them into Chinese characters or symbols </li></ul></ul></ul><ul><ul><ul><li>Can also be used as a digitizing tablet </li></ul></ul></ul>A handwriting board 12.1 Input Devices
  14. 14. <ul><li>Scanners </li></ul><ul><ul><li>Used to input text and graphics into computers </li></ul></ul><ul><ul><li>Project light onto an object </li></ul></ul><ul><ul><li>Capture the reflected light and interpret it as a pattern of coloured dots </li></ul></ul>A pen scanner A scanner 12.1 Input Devices
  15. 15. <ul><li>Scanners </li></ul><ul><ul><li>Pattern of dots forms a bitmap image </li></ul></ul><ul><ul><li>The resolution , measured in dots per inch (dpi), determines the sharpness of the picture. </li></ul></ul><ul><ul><li>The colour depth (or bit depth) of a scanner indicates the number of colours used to represent each dot. </li></ul></ul><ul><ul><li>The accuracy of a scanned image depends on its likeness to the original object. </li></ul></ul><ul><ul><li>Quality of scanned image is determined by: </li></ul></ul><ul><ul><ul><li>Resolution </li></ul></ul></ul><ul><ul><ul><li>Colour depth </li></ul></ul></ul><ul><ul><ul><li>Accuracy </li></ul></ul></ul>12.1 Input Devices
  16. 16. <ul><li>Scanners </li></ul><ul><ul><li>Can be used with optical character recognition (OCR) software to convert the text on a printed document into an editable file </li></ul></ul>Scan a document by a scanner. Import into OCR software. An editable file is created. Using OCR software to convert text into an editable file 12.1 Input Devices
  17. 17. <ul><li>Optical Readers </li></ul><ul><ul><li>Read predetermined characters, marks or codes and translate them into digital data. </li></ul></ul><ul><ul><li>Examples: </li></ul></ul><ul><ul><ul><li>Bar code readers </li></ul></ul></ul><ul><ul><ul><li>Optical mark readers </li></ul></ul></ul>12.1 Input Devices
  18. 18. <ul><li>Optical Readers </li></ul><ul><ul><li>Bar code readers </li></ul></ul><ul><ul><ul><li>A mini-scanner which capture images of bar codes and translate them into digital data </li></ul></ul></ul><ul><ul><ul><li>The use of bar codes greatly increase the accuracy and efficiency of data entry. </li></ul></ul></ul>A bar code reader 12.1 Input Devices
  19. 19. <ul><li>Optical Readers </li></ul><ul><ul><li>Optical Mark Readers </li></ul></ul><ul><ul><ul><li>Used with optical mark recognition (OMR) software </li></ul></ul></ul><ul><ul><ul><li>OMR software recognizes specific handwritten marks. </li></ul></ul></ul><ul><ul><ul><li>Commonly applied to collect data from: </li></ul></ul></ul><ul><ul><ul><ul><li>Multiple choice answer sheets </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Course registration forms </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Questionnaires </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Lottery tickets </li></ul></ul></ul></ul>An optical mark reader 12.1 Input Devices
  20. 20. <ul><li>Microphones </li></ul><ul><ul><li>Allow users to record sound into a computer. </li></ul></ul><ul><ul><li>Usually connected to a sound card installed on the motherboard </li></ul></ul><ul><ul><li>Recorded sound can be saved as a digital file and played back using a media-playing program. </li></ul></ul><ul><ul><li>Can be used with speech recognition software which translates vocal speech into text or commands </li></ul></ul>12.1 Input Devices A microphone
  21. 21. <ul><li>Digital Cameras and Digital Video Cameras </li></ul><ul><ul><li>Digital cameras </li></ul></ul><ul><ul><ul><li>Use a light-sensitive processor chip to capture scenes and turn them into digital images. </li></ul></ul></ul><ul><ul><ul><li>Images are stored in a memory card and the amount of memory space taken depends on the compression ratio, the file format and image resolution. </li></ul></ul></ul><ul><ul><ul><li>Usually contains an LCD display </li></ul></ul></ul><ul><ul><ul><li>The larger the number of light-sensitive photosites in the light-sensitive processor chip, the higher the resolution of the digital image. </li></ul></ul></ul>12.1 Input Devices A digital camera
  22. 22. <ul><li>Digital Cameras and Digital Video Cameras </li></ul><ul><ul><li>Web cam </li></ul></ul><ul><ul><ul><li>Special type of digital cameras </li></ul></ul></ul><ul><ul><ul><li>Usually connected to a computer </li></ul></ul></ul><ul><ul><ul><li>Images captured can be stored in a computer. </li></ul></ul></ul><ul><ul><ul><li>Commonly used for video conferencing and remote surveillance via a computer network. </li></ul></ul></ul>12.1 Input Devices A web cam
  23. 23. <ul><li>Digital Cameras and Digital Video Cameras </li></ul><ul><ul><li>Digital video cameras </li></ul></ul><ul><ul><ul><li>Also use a light-sensitive processor chip to capture the moving images </li></ul></ul></ul><ul><ul><ul><li>Store images as a sequence of high-quality digital images to form a video file. </li></ul></ul></ul><ul><ul><ul><li>Storage media can be DV tapes, DVDs or internal hard disks. </li></ul></ul></ul>A digital video camera 12.1 Input Devices
  24. 24. <ul><li>Digital Cameras and Digital Video Cameras </li></ul><ul><ul><li>Digital video cameras </li></ul></ul><ul><ul><ul><li>Also use a light-sensitive processor chip to capture the moving images </li></ul></ul></ul><ul><ul><ul><li>Store images as a sequence of high-quality digital images to form a video file. </li></ul></ul></ul><ul><ul><ul><li>Storage media can be DV tapes, DVDs or internal hard disks. </li></ul></ul></ul>A digital video camera 12.1 Input Devices
  25. 25. 12.2 Output Devices <ul><li>Output Devices </li></ul><ul><ul><li>Hardware that translates computer processes and information into a form that humans can understand </li></ul></ul><ul><ul><li>Examples: </li></ul></ul><ul><ul><ul><li>Visual display units </li></ul></ul></ul><ul><ul><ul><li>Speakers </li></ul></ul></ul><ul><ul><ul><li>Printers </li></ul></ul></ul><ul><ul><ul><li>Video projectors </li></ul></ul></ul>
  26. 26. <ul><li>Visual Display Units (VDU) </li></ul><ul><ul><li>Also called monitor </li></ul></ul><ul><ul><li>Allow a user to view a computer’s output instantly on a screen </li></ul></ul><ul><ul><li>Information on the screen is intangible. </li></ul></ul><ul><ul><li>Examples: </li></ul></ul><ul><ul><ul><li>Cathode ray tube (CRT) monitors </li></ul></ul></ul><ul><ul><ul><li>Liquid crystal display (LCD) monitors </li></ul></ul></ul>12.2 Output Devices
  27. 27. <ul><li>Visual Display Units (VDU) </li></ul><ul><ul><li>CRT monitor </li></ul></ul><ul><ul><ul><li>Size = diagonal length of the screen </li></ul></ul></ul><ul><ul><ul><li>The screen is divided into many dots known as pixels . </li></ul></ul></ul><ul><ul><ul><li>A pixel is the smallest display unit of the monitor screen. </li></ul></ul></ul><ul><ul><ul><li>Quality of a monitor’s display depends on its resolution, dot pitch and contrast ratio . </li></ul></ul></ul>A CRT monitor Pixel Dot pitch Pixels and dot pitch 12.2 Output Devices
  28. 28. <ul><li>Visual Display Units (VDU) </li></ul>Resolution, dot pitch and contrast ratio of visual display units 12.2 Output Devices Resolution <ul><li>The number of pixels a monitor can display </li></ul><ul><li>At a higher resolution, you can display a larger working area, but the text and images will appear smaller. </li></ul>Dot pitch <ul><li>The vertical distance between each pixel on a screen </li></ul><ul><li>The smaller the dot pitch, the sharper the displayed images is. </li></ul>Contrast ratio <ul><li>The measurement of the difference in light intensity between the brightest white and the darkest black </li></ul><ul><li>The higher the contrast ratio, the more levels of colour can be distinguished. </li></ul>
  29. 29. <ul><li>Visual Display Units (VDU) </li></ul><ul><ul><li>LCD monitors </li></ul></ul><ul><ul><ul><li>Slimmer </li></ul></ul></ul><ul><ul><ul><li>Lighter </li></ul></ul></ul><ul><ul><ul><li>Lower power consumption </li></ul></ul></ul><ul><ul><ul><li>Better sharpness </li></ul></ul></ul><ul><ul><ul><li>Lower radiation emission </li></ul></ul></ul><ul><ul><ul><li>More expensive </li></ul></ul></ul><ul><ul><ul><li>Lower contrast ratio </li></ul></ul></ul><ul><ul><ul><li>Lower refresh rate </li></ul></ul></ul><ul><ul><ul><li>Colour of images displayed on an LCD monitor varies significantly at different angles. </li></ul></ul></ul><ul><ul><ul><li>Unsuitable for graphic design and photo retouching. </li></ul></ul></ul>An LCD monitor 12.2 Output Devices
  30. 30. <ul><li>Speakers </li></ul><ul><ul><li>Used to convert audio signals of a computer into sound </li></ul></ul><ul><ul><li>Most personal computers have small built-in speakers that produce warning sounds to alert users to certain events. </li></ul></ul><ul><ul><li>Essential output devices for multimedia computers. </li></ul></ul><ul><ul><li>Connected to a sound card. </li></ul></ul><ul><ul><li>Sound card will converts digital audio signals into analogue signals for output through the speakers. </li></ul></ul><ul><ul><li>Subwoofer can produce better base frequencies. </li></ul></ul>A pair of speakers with a subwoofer 12.2 Output Devices
  31. 31. <ul><li>Printers </li></ul><ul><ul><li>Produce text and graphics on a physical medium such as paper or transparency film. </li></ul></ul><ul><ul><li>Printed information is called a hard copy or a printout. </li></ul></ul><ul><ul><li>Major factors of a printer’s performance: </li></ul></ul><ul><ul><ul><li>Resolution </li></ul></ul></ul><ul><ul><ul><ul><li>Determine the sharpness of a printout </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Measured by number of dots per inch (dpi) </li></ul></ul></ul></ul><ul><ul><ul><li>Printing speed </li></ul></ul></ul><ul><ul><ul><ul><li>Measured by number of pages per minute (ppm) or characters per second (cps) </li></ul></ul></ul></ul>12.2 Output Devices
  32. 32. <ul><li>Printers </li></ul><ul><ul><li>Dot-matrix printers </li></ul></ul><ul><ul><ul><li>Contain a print head made up of small pins. </li></ul></ul></ul><ul><ul><ul><li>Produce printed images by striking those pins against an ink ribbon to leave dots on the paper. </li></ul></ul></ul><ul><ul><ul><li>Slow, noisy and incapable of producing high-quality printouts </li></ul></ul></ul><ul><ul><ul><li>Resolutions rarely exceed 480 dpi. </li></ul></ul></ul><ul><ul><ul><li>Speeds vary from 200 cps to 600 cps. </li></ul></ul></ul><ul><ul><ul><li>Ideal for printing multi-part forms </li></ul></ul></ul>A dot-matrix printer 12.2 Output Devices
  33. 33. <ul><li>Printers </li></ul><ul><ul><li>Inkjet Printers </li></ul></ul><ul><ul><ul><li>Form images by spraying tiny ink drops onto paper. </li></ul></ul></ul><ul><ul><ul><li>Can use a black cartridge and one or more colour cartridges to produce high-quality colour printouts. </li></ul></ul></ul><ul><ul><ul><li>Typical inkjet printer provides a resolution of 600 dpi to 5,760 dpi. </li></ul></ul></ul><ul><ul><ul><li>Speed: 1 ppm – 27 ppm </li></ul></ul></ul>An inkjet printer 12.2 Output Devices
  34. 34. <ul><li>Printers </li></ul><ul><ul><li>Laser printers </li></ul></ul><ul><ul><ul><li>Use a laser beam to produce an electrostatic film on a drum according to the dot pattern of the output image. </li></ul></ul></ul><ul><ul><ul><li>The toner sticks to the charged area when the drum rotates against the toner cartridge. </li></ul></ul></ul><ul><ul><ul><li>Toner is then transferred and fused on the paper as the drum presses against it. </li></ul></ul></ul>A laser printer 12.2 Output Devices
  35. 35. <ul><li>Printers </li></ul><ul><ul><li>Laser printers </li></ul></ul><ul><ul><ul><li>Can produce high resolution printouts at high speed </li></ul></ul></ul><ul><ul><ul><li>Resolution: 600 dpi – 4,800 dpi </li></ul></ul></ul><ul><ul><ul><li>Speed: 4 ppm – 50 ppm </li></ul></ul></ul><ul><ul><ul><li>Has to store the whole image of the page before the printing process begins </li></ul></ul></ul><ul><ul><ul><li>More complicated graphics printed at high resolution requires much more memory than a page with simple text only. </li></ul></ul></ul><ul><ul><ul><li>Colour laser print one page in four passes with four different colour toners. </li></ul></ul></ul>12.2 Output Devices
  36. 36. <ul><li>Printers </li></ul><ul><ul><li>Thermal printer </li></ul></ul><ul><ul><ul><li>Produces a printed image by selectively heating thermal paper when the paper passes over the thermal print head. </li></ul></ul></ul><ul><ul><ul><li>Coating of the thermal paper turns black in the areas where it is heated, producing an image. </li></ul></ul></ul><ul><ul><ul><li>Commonly used in point-of sale systems. </li></ul></ul></ul>A thermal printer 12.2 Output Devices
  37. 37. <ul><li>Printers </li></ul><ul><ul><li>Plotters </li></ul></ul><ul><ul><ul><li>Used to create high-quality or large-format printouts such as: </li></ul></ul></ul><ul><ul><ul><ul><li>Blueprints </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Maps </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Posters </li></ul></ul></ul></ul><ul><ul><ul><li>Mechanism of a plotter is similar to an inkjet printer. </li></ul></ul></ul>Plotters 12.2 Output Devices
  38. 38. <ul><li>Multifunction Printers </li></ul><ul><ul><li>Include the functions of printing and communication. </li></ul></ul><ul><ul><li>Example: </li></ul></ul><ul><ul><ul><li>Printer </li></ul></ul></ul><ul><ul><ul><li>Scanner </li></ul></ul></ul><ul><ul><ul><li>Photocopier </li></ul></ul></ul><ul><ul><ul><li>Fax machine </li></ul></ul></ul><ul><ul><ul><li>Telephone </li></ul></ul></ul><ul><ul><li>Suitable for small office home office (SOHO) </li></ul></ul><ul><ul><li>Take up less space. </li></ul></ul><ul><ul><li>Cheaper than buying all the devices separately </li></ul></ul>A multifunction printer 12.2 Output Devices
  39. 39. <ul><li>Video Projectors </li></ul><ul><ul><li>Project the computer display onto a large screen </li></ul></ul><ul><ul><li>Use high intensity light bulb and a set of optical lenses </li></ul></ul><ul><ul><li>Examples: </li></ul></ul><ul><ul><ul><li>Liquid crystal display (LCD) projectors </li></ul></ul></ul><ul><ul><ul><li>Digital light processing (DLP) projectors </li></ul></ul></ul>12.2 Output Devices
  40. 40. <ul><li>Video Projectors </li></ul><ul><ul><li>LCD projector </li></ul></ul><ul><ul><ul><li>Use a built-in light source to project the image on its LCD panel onto a screen </li></ul></ul></ul><ul><ul><li>DLP projector </li></ul></ul><ul><ul><ul><li>Build images on the screen by digitally controlling the reflection on tiny mirrors </li></ul></ul></ul><ul><ul><li>Quality of video projector: </li></ul></ul><ul><ul><ul><li>Display resolution </li></ul></ul></ul><ul><ul><ul><ul><li>Standard: 1,024 x 768 </li></ul></ul></ul></ul><ul><ul><ul><li>Brightness </li></ul></ul></ul><ul><ul><ul><ul><li>Standard: 2,000 ANSI lumens </li></ul></ul></ul></ul>An LCD projector 12.2 Output Devices
  41. 41. <ul><li>Video Projectors </li></ul><ul><ul><li>LCD projector </li></ul></ul><ul><ul><ul><li>Use a built-in light source to project the image on its LCD panel onto a screen </li></ul></ul></ul><ul><ul><li>DLP projector </li></ul></ul><ul><ul><ul><li>Build images on the screen by digitally controlling the reflection on tiny mirrors </li></ul></ul></ul><ul><ul><li>Quality of video projector: </li></ul></ul><ul><ul><ul><li>Display resolution </li></ul></ul></ul><ul><ul><ul><ul><li>Standard: 1,024 x 768 </li></ul></ul></ul></ul><ul><ul><ul><li>Brightness </li></ul></ul></ul><ul><ul><ul><ul><li>Standard: 2,000 ANSI lumens </li></ul></ul></ul></ul>An LCD projector 12.2 Output Devices
  42. 42. 12.3 Daily Applications of Input and Output Devices <ul><li>Point-of-sale (POS) Terminal </li></ul><ul><ul><li>Widely used in supermarkets and chain stores </li></ul></ul><ul><ul><li>Consists of the register itself and some various input devices and output devices </li></ul></ul><ul><ul><li>Input devices used: </li></ul></ul><ul><ul><ul><li>Bar code reader </li></ul></ul></ul><ul><ul><ul><li>Keyboard </li></ul></ul></ul><ul><ul><ul><li>Readers for credit cards, Octopus cards and ATM cards </li></ul></ul></ul><ul><ul><li>Output devices used: </li></ul></ul><ul><ul><ul><li>Thermal printers </li></ul></ul></ul><ul><ul><ul><li>Monitors </li></ul></ul></ul>A point-of-sale terminal in a supermarket
  43. 43. <ul><li>Cheque deposit Machine </li></ul><ul><ul><li>Equipped with a touch screen and an ATM card reader </li></ul></ul><ul><ul><li>When cheques are inserted into the machine, the machine scans the cheques one by one. </li></ul></ul><ul><ul><li>Print receipt slips using a thermal printer. </li></ul></ul>A cheque deposit machine in a branch of Bank of China (Hong Kong) Limited 12.3 Daily Applications of Input and Output Devices
  44. 44. <ul><li>SOHO </li></ul><ul><ul><li>SOHO = small office home office </li></ul></ul><ul><ul><li>Working space is a big concern </li></ul></ul><ul><ul><li>Prefer to use a multifunction printer </li></ul></ul><ul><ul><li>Prefer notebook computer to desktop computers </li></ul></ul>A SOHO office 12.3 Daily Applications of Input and Output Devices
  45. 45. <ul><li>Conference Room </li></ul><ul><ul><li>Most essential equipment for presentations: video projector </li></ul></ul><ul><ul><li>Wireless pointing devices </li></ul></ul><ul><ul><ul><li>Allow the presenter to walk around the room during the presentation </li></ul></ul></ul><ul><ul><ul><li>May be equipped with a laser pointer, timer, buttons for slideshow controls, volume control and built-in flash memory </li></ul></ul></ul>Wireless pointing devices for presentations in a conference room 12.3 Daily Applications of Input and Output Devices
  46. 46. <ul><li>Conference Room </li></ul><ul><ul><li>Most essential equipment for presentations: video projector </li></ul></ul><ul><ul><li>Wireless pointing devices </li></ul></ul><ul><ul><ul><li>Allow the presenter to walk around the room during the presentation </li></ul></ul></ul><ul><ul><ul><li>May be equipped with a laser pointer, timer, buttons for slideshow controls, volume control and built-in flash memory </li></ul></ul></ul>Wireless pointing devices for presentations in a conference room 12.3 Daily Applications of Input and Output Devices
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