COMPUTERS: TOOLS FOR AN INFORMATION AGE Chapter 5 – Part 2 Input and Output

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Text of COMPUTERS: TOOLS FOR AN INFORMATION AGE Chapter 5 – Part 2 Input and Output

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COMPUTERS: TOOLS FOR AN INFORMATION AGE Chapter 5 Part 2 Input and Output Slide 2 Output: Information for the User Computer screens Printers Voice output Music output Microform Slide 3 Computer Screen Technology Screen is part of computers monitor Screen output known as soft copy temporary Common forms Cathode ray tube (CRT) Flat-panel screens Slide 4 CRT Screens Display text and graphics Most are in color Graphics card converts signals from the control unit into the image the user sees Slide 5 Factors Affecting Performance Scan rate The frequency with which the image is refreshed Resolution (clarity) of screen Measured in pixels (picture elements) The more pixels, the higher the resolution Dot pitch The amount of space between dots The smaller the dot pitch, the sharper the image Video memory A high-speed form of RAM installed on graphics card Slide 6 Graphic Standards Agree on resolutions, colors, other issues related to displaying graphics Super Video Graphics Adapter (SVGA) is most common standard Provides 800 (horizontal) x 600 (vertical) pixels on the display Support 16 million colors The number of colors that can be displayed depends on amount of video memory Slide 7 Flat-Panel Screens Liquid crystal display (LCD) Very thin (only a few inches) Produce sharper text images than CRTs Easier on eyes than CRTs Flat-panel technologies Slide 8 LCD Technologies Active-matrix Uses many thin-film transistors (TFT) Produces brighter image and can be viewed from wider angles Passive-matrix Uses fewer transistors Cheaper and uses less power Gas plasma Supports very large displays Has brilliant color display Viewable at very wide angles Slide 9 Printers Produce information on paper output Printed output known as hard copy Orientation settings Portrait - vertical alignment Landscape - horizontal alignment Two ways of printing Impact printer Nonimpact printer Slide 10 Impact Printers Physical contact with paper required to produce image Dot-matrix printer Has print head consisting of one or more columns of pins Pins form characters and images as pattern of dots Slide 11 Nonimpact Printers Places an image on a page without physically touching it Laser printer Uses light beam to help transfer images to paper Produces high-quality output at very fast speeds Ink-jet printer Sprays dots of ink Less expensive than laser printers Slide 12 Voice Output Converts data to vocalized sounds Used in automated telephone-based customer service applications Slide 13 Music Output Multimedia clips, games, videos include sight and sound Speakers placed on side of monitor Slide 14 Computer Output Microform (COM) Output of photographically reduced images on microfilm Common use Libraries store back issues of magazines, newspapers, etc. Slide 15 Terminals Combine input and output capabilities Dumb terminal Keyboard for input and monitor for output No processing capability Intelligent terminal Has limited memory and a processor Slide 16 Computer Graphics Business graphics Video graphics Computer-aided design (CAD) Slide 17 Business Graphics A powerful way to display information Colorful graphics, maps, and charts help managers compare data, and make quicker decisions As underlying data changes, charts and graphs are instantly updated Slide 18 Terminals Combine input and output capabilities Dumb terminal Keyboard for input and monitor for output No processing capability Intelligent terminal Has limited memory and a processor Slide 19 Video Graphics A series of video images Displayed rapidly to give the impression of motion Used extensively in television Also used in computer and arcade video games Slide 20 Computer-Aided Design (CAD) Creates two- and three-dimensional (2D and 3D designs) Serves as bridge between design and manufacturing