Chapter 6 Objectives
Define the four Describe the uses of speakers categories of output and headsets
Identify the purpose of data Identify the different types projectors, fax machines, and of display devices multifunction devices
Describe factors that affect Explain how a terminal is both Chapter 6 the quality of a display device an input and output device
Output Identify monitor ergonomic Identify output options for issues physically challenged users
Explain the differences among various types of printers
Next p. 6.2
What is Output? What Are Output Devices? What Is output? What is an output device? • Data that has • Any hardware component that can convey been information to a user processed into a useful form, text called graphics information monitor speakers
Next Next p. 6.2 Fig. 6-1 audio p. 6.4
Display Devices Display Devices What is a display device? What is a CRT monitor? • Television-like • Large sealed, glass screen cathode ray tube • Screen coated with tiny • Information on a dots of phosphor material display device •Pixel, or picture element, is sometimes is called single point in electronic soft copy image • Three dots (red, blue, and green) combine to make up each pixel
CRT monitor screen Next Next p. 6.4 p. 6.5 Fig. 6-3
1 Display Devices Display Devices What are typical sizes for CRT monitors? What is a liquid crystal display (LCD) monitor? • 15, 17, 19, 21, and • Type of flat-panel 22 inch screen size • Viewable size is display diagonal • Uses liquid crystals measurement of between two sheets of actual viewing area e material to present provided by the iz s monitor en information on screen re e sc iz s le • Electric current passes ab ew through crystals, which vi creates images on the Next Next screen p. 6.5 p. 6.5 Fig. 6-4
Display Devices Display Devices Where are some features of LCD screens? What is a Web-enabled device? • Lightweight and • Allows access to the compact Web or e-mail • Consumes less – Cellular telephones than one-third of – Pagers the power than does a CRT • Many use monitor monochrome LCD • Ideal for notebook displays to save and handheld battery power computers
Next Next p. 6.6 Fig. 6-5 p. 6.6 Fig. 6-6
Display Devices Display Devices What is an electronic book (e-book) ? What are the two technologies used for LCD • Small, book-sized computer that uses an LCD monitors? screen • Allows users to read, save, highlight, bookmark, and add notes to online text Passive-matrix • Download new book content display from Web Active-matrix display • Color often not as bright • Can display high-quality • Images best viewed color viewable from all when working directly in front of display Next Next angles p. 6.7 Fig. 6-7 p. 6.8
2 Display Devices Display Devices What is a gas plasma monitor? What is display resolution? • Describes the sharpness and clarity of image • Flat-panel display uses layer of gas plasma • The higher the resolution, the sharper the image and the between two sheets of material more that can display on the monitor Larger screen sizes and higher 800 x 600 most common 800 display quality than horizontal LCD, but much pixels more expensive 1280 x 1024 maximum resolution 600 vertical of most monitors pixels Total of 480,000 2048 x 1536 pixels on screen Next Next maximum for p. 6.8 Fig. 6-8 p. 6.8 high-end monitors
Display Devices Display Devices What is dot pitch? What is refresh rate? Should be fast • Measure of the • Speed at which enough to maintain a distance between monitor redraws constant, flicker-free image pixels images on the Use a monitor screen • Sometimes called with a dot pitch of .29 millimeters pixel pitch High-quality monitor or lower to will provide refresh • Smaller the minimize eye rate of at least 75 fatigue distance between hertz the pixels, the sharper the image Image on the screen redraws itself 75 Next Next times per second p. 6.9 p. 6.9
Display Devices Display Devices
How does video travel Step 1 What is a video card? Step 2 from the processor to a • Converts digital CRT monitor? output from 1: Processor sends digital data to computer into video card analog video signal 2: Video card converts digital data Step 3 to analog signal • Controls how 3: Analog signal sent via cable to display device CRT monitor produces picture 4: CRT separates signal into red, green, and blue signals Step 4 • Also called graphics 5: Electron guns fire color signals card or video to front of CRT Step 5 adapter 6: Image displays Step 6
Next Next p. 6.10 p. 6.10 Fig. 6-10
3 Display Devices Display Devices What is bit depth? 8-bit video 28 = What are video standards? 2 x 2 x • Number of bits a video card 2 x 2 x • Video Electronics Standards Association (VESA) develops card uses to store Uses 8 bits to video standards information about each store information 2 x 2 x pixel about each pixel 2 x 2 = • Also called color depth 256 Can display 256 • Determines number colors of colors a video card different colors can display • Greater the number 24-bit of bits, better the video card 24 resulting image 2 = Uses 24 bits to 16.7 million store information colors about each pixel Next Next p. 6.10 Can display 16.7 p. 6.11 Fig. 6-11 million colors
Display Devices Display Devices What are various video card configurations? What is electromagnetic radiation (EMR)? • Magnetic field that travels at speed of light Sit at arm’s length from • Small amount CRT produced by all CRT monitors EMR is greatest on sides and back of CRT monitor LCD monitors do not pose
Next Next this risk p. 6.11 p. 6.11 Fig. 6-12
Display Devices Display Devices
What is the ENERGY STAR® program? What is Interactive TV? • Program to encourage manufacturers to create • Two-way communications technology in which users energy-efficient devices that require little power interact with television programming when not in use • HDTV works directly with interactive TV • Monitors and devices meeting guidelines display ENERGY STAR® Select a Play Bank label movie from games a central library of Vote or movies Shop respond to network questionnaires Next Next p. 6.12 Fig. 6-13 p. 6.12
4 Printers Printers What is a printer? What is an impact printer? • Output device that portraitportrait • Forms characters by striking a orientationorientation mechanism against ink ribbon produces text and that physically contacts paper graphics on paper • Ideal for printing multipart • Result is hard copy, forms or printout • Can withstand dusty environments, vibrations, and • Two orientations extreme temperatures
Next landscapelandscape Next p. 6.12 Fig. 6-14 orientationorientation p. 6.14
Printers Printers What is a dot-matrix printer? How does a dot-matrix printer work? • Impact printer that produces printed images when tiny wire pins on print head mechanism strike inked ribbon • When ribbon presses against • Most use continuous-form paper paper, it creates dots that form characters and graphics • A higher number of pins (9 to 24) means printer prints more dots per character, which results in higher print quality
continuous-form paper dots form characters Next Next p. 6.14 Fig. 6-17 p. 6.14 Fig. 6-17
Printers Printers What is a line printer? What is a non-impact printer? • High-speed impact printer that • Forms characters prints entire line at a time and graphics on • Speed measured by number of piece of paper lines per minute (lpm) it can print without actually • Band printer prints fully-formed striking paper characters using a hammer mechanism thermal printer • Shuttle-matrix printer is high- ink-jet printer speed printer that works more like a dot-matrix printer
Next Next p. 6.14 Fig. 6-18 p. 6.15 laser printer
5 Printers Printers What is an ink-jet printer? What is the resolution of a printer? • Nonimpact printer • Sharpness and clarity of characters forms characters and • Measured by number of dots per inch (dpi) graphics by spraying printer can tiny drops of liquid ink output onto piece of paper 300 dpi600 dpi 1,200 dpi • Most popular type of color printer for home use
Next Next p. 6.15 Fig. 6-19 p. 6.15 Fig. 6-20
Printers Printers
1: Small How does an ink-jet printer work? resistor heats What is a laser printer? Print cartridge ink, causing ink to boil and • High-speed, high- form vapor quality nonimpact bubble printer
firing • Prints text and chamber graphics in very high- nozzle quality resolution, print head resistor ranging from 600 to 2: Vapor bubble forces ink 1,200 dpi through nozzle ink dot • Typically costs more 3: Ink drops onto paper than ink-jet printer, 4: As vapor bubble bubble but is much faster Next collapses, fresh ink is nozzle Next p. 6.16 Fig. 6-21 drawn into firing chamber ink p. 6.16 Fig. 6-17 paper
Printers Printers
1: Drum rotates as How does a laser printer work? paper is fed through What is a thermal printer? 2: Mirror deflects • Generates images by pushing electrically heated laser beam across surface of drum rotating mirror pins against heat-sensitive paper 3: Laser beam • Ideal for small devices, such as adding machines creates charge that drum causes toner to stick to drum 4: As drum rotates, toner transfers from drum to paper rollers 5: Rollers use heat and pressure to fuse toner to paper
Next Next p. 6.17 Fig. 6-23 p. 6.19 Fig. 6-24
6 Printers Printers What is a What is a label printer? photo printer? • Small printer that • Color prints on adhesive printer that type material that produces can be placed on photo lab Select image to print, a variety of items quality number of copies, and size of print • Most also print bar pictures codes and and prints e-stamps everyday documents Next Next p. 6.20 Fig. 6-25 p. 6.21 Fig. 6-26
Printers Printers plotter What is a portable printer? What is a plotter? • Small, lightweight portable printer • Sophisticated ink-jet or thermal printer used to printer that allows produce high- mobile user to quality drawings print from • Large-format notebook or printer similar to handheld plotter and is computer while used to print traveling quality color prints
Next Next large-format printer p. 6.22 Fig. 6-27 p. 6.22
Speakers and Speakers and Headsets Headsets What is an audio output device? What is voice output? • Computer component that produces music, • Computer RealPlayer speech, and other sounds talks to you • Speakers and headsets are common devices through speakers speakers on computer
link to audio Next woofer Next p. 6.23 Fig. 6-29 p. 6.24 Fig. 6-31 broadcast
7 Speakers and Other Output Devices Headsets What is Internet telephony? What is a data projector? • Allows you to have a conversation over the • Device that takes image from a computer screen Web, just as if you were talking on the and projects it onto a larger screen telephone
data projector
Next Next p. 6.24 p. 6.25 Fig. 6-32
Other Output Devices Other Output Devices What is a facsimile (fax) machine? What is a fax modem? • Device that transmits and • Modem that allows you to send and receive receives documents over electronic documents as faxes telephone lines
fax machine
internalinternal faxfax modemmodem Next Next cardcard in in p. 6.25 Fig. 6-33 p. 6.26 Fig. 6-34 externalexternal fax fax systemsystem modemmodem unitunit
Other Output Devices Terminals What is a multifunction device (MFD) ? What is a terminal? • Provides the • Device that performs both input and output functionality of a printer, scanner, copy machine, and fax machine
special- dumb intelligent purpose all in one terminals terminals terminals Next Next p. 6.26 Fig. 6-35 p. 6.27
8 Terminals Terminals host computer keyboard and monitor What is a dumb terminal? What is an intelligent terminal? Has a keyboard and • Has monitor, monitor, but no keyboard, memory processor or memory and processor Connects to host • Similar to a PC in computer that that it can perform performs processing tasks independent and then sends output of host computer back • Programmable
Next Next intelligent terminal p. 6.27 Fig. 6-36 p. 6.28
Terminals Terminals What is a point-of-sale (POS) terminal? What is an automated teller machine (ATM)? • Records purchases at point • Self-service banking where purchase is made machine that connects • Output from POS terminals to host computer serves as through telephone input to host network computer
POS terminal in a grocery store
Next scanner and keyboard are input Next p. 6.28 Fig. 6-37 p. 6.29 Fig. 6-37
Output Devices for Physically Output Devices for Physically Challenged Users Challenged Users What other output options are available for visually What is the Magnifier command? MagnifierMagnifier commandcommand impaired users? • Windows Magnifier • Change Window’s command enlarges settings such as text and other items increasing size or in window on changing color of text to make words easier screen to read • Blind users can work with voice output LocationLocation of of • Braille printer outputs mousemouse pointer pointer information in Braille magnifiedmagnified at at onto paper toptop of of screen screen Next Next p. 6.29 Fig. 6-38 p. 6.30 Fig. 6-39 Braille printer
9 Summary Putting It All Together What are suggested output devices for the What are suggested output devices for the SOHO user? Home user? Mobile Mobile Home Small Office/Home Office 19- orHome 21-inch color CRT Small Office/Home Office monitor Home 17- or 19-inch color CRT Small Office/Home Office monitor Color LCD display for High-definition television handheld computer Ink-jet color printer; or Multifunction device; or Power photo printer;Large Businessor label printer ink-jetPower color printer; or Large Business laser printer, black and white Speakers and headset Label printer Fax machine
Next Next p. 6.30 Fig. 6-40 Speakers and headset p. 6.30 Fig. 6-40
Putting It All Together Putting It All Together What are suggested output devices for the Mobile user? What are suggested output devices for the Large Business user?
Mobile Mobile Home Small Office/Home Office Home Small Office/Home Office 15.4-inch color LCD display 19- or 21-inch color CRT or LCD monitor with notebook computer Mobile 15.4-inch color LCD display for Large Business 19-inch color CRT monitor for notebook computer notebook computer docking station Color LCD display for handheld computer Color LCD display for handheld computer Laser printer, black and white Portable printer Line printer (for large reports Power Large Business from mainframe)Power Large Business Ink-jet color printer; or laser printer, black and white, for in-office use; Label printer or photo printer Fax machine or fax modem Fax modem Speakers and headset Headset DLP data projector Next Next DL data projector Dumb terminal p. 6.30 Fig. 6-40 p. 6.30 Fig. 6-40
Putting It All Together Summary of Output
What are suggested output devices for the Power user? • What is output? Mobile Home Small Office/Home Office • What are output devices? 21-inch color LCD monitor • Display devices Power Laser printer • Printers Plotter • Speakers and headsets Photo printer; or • Other output devices dye sublimation printer Power Large Business • Terminals Fax machine or fax modem • Output devices for physically challenged Speakers and headset users
Next Chapter 6 Complete p. 6.30 Fig. 6-40
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