Discovering Computers 2012 Your Interactive Guide to the
Discovering Computers 2012 Your Interactive Guide to the Digital World Objectives Overview Describe the types of output Explain the characteristics of various display devices Describe various ways to print
See Page 303 for Detailed Objectives Describe the factors that affect the quality of an LCD monitor or LCD screen Differentiate between a nonimpact printer and an impact printer Discovering Computers 2012: Chapter 6
2 Objectives Overview Summarize the characteristics of ink-jet printers, photo printers, laser printers, multifunction peripherals, thermal printers, mobile printers, label and postage printers, and plotters and large-format printers Describe the uses and characteristics of speakers, headphones, and earbuds Identify the purpose and
features of data projectors, interactive whiteboards, and force-feedback game controllers and tactile output Identify output options for physically challenged users See Page 303 for Detailed Objectives Discovering Computers 2012: Chapter 6 3 What Is Output?
Output is data that has been processed into a useful form Pages 304 305 Figure 6-1 Discovering Computers 2012: Chapter 6 4 What Is Output? An output device is any type of hardware component that conveys information to one or more people Display devices
Interactive whiteboards Page 305 Printers Speakers, headphones, and earbuds Force-feedback game controllers Discovering Computers 2012: Chapter 6
Data projectors Tactile output 5 Display Devices A display device visually conveys text, graphics, and video information A monitor is packaged as a separate peripheral LCD monitor Widescreen
Pages 306 207 Figures 6-2 6-3 Discovering Computers 2012: Chapter 6 6 Display Devices Liquid crystal display (LCD) uses a liquid compound to present information on a display device Active-matrix display Page 308
Passive-matrix display Discovering Computers 2012: Chapter 6 7 Display Devices The quality of an LCD monitor or LCD screen depends primarily on: Resolution Response time Dot pitch
Pages 308 - 310 Brightness Contrast ratio Discovering Computers 2012: Chapter 6 8 Display Devices Resolution is the number of horizontal and vertical pixels in a display device
A higher resolution uses a greater number of pixels Pages 308 309 Figure 6-5 Discovering Computers 2012: Chapter 6 9 LCD Technology and Quality
Response time of an LCD is the time in milliseconds (ms) that it takes to turn a pixel on or off. LCD response times range from 8 to 25 ms. The lower the number, the faster the response time. 10 LCD Technology and Quality Brightness of LCD is measured in nits.
A nit is a unit of visible light intensity. The higher the nits, the brighter the images. 11 LCD Technology and Quality Pixel pitch Some times called dot pitch, is the distance in millimeters between pixels on
a display device. Average pixel pitch on LCD should be 0.28 12 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, an HDMI port, or a Display Port Page 310 Figure 6-6
Discovering Computers 2012: Chapter 6 13 Display Devices Plasma monitors are display devices that use gas plasma technology and offer screen sizes up to 150 inches Large business users or power users sometime have plasma monitors , which often measure more than 60 inches wide. Plasma monitor offer larger screen size & higher display quality than LCD monitors but are more expensive. These monitor also can hang directly on a wall. Page 311 Figure 6-8
Discovering Computers 2012: Chapter 6 14 Display Devices Televisions also are a good output device Require a converter if you are connecting your computer to an analog television Digital television (DTV) offers a crisper, higherquality output HDTV is the most advanced
form of digital television Page 312 Figure 6-9 Discovering Computers 2012: Chapter 6 15 Display Devices A CRT monitor is a desktop monitor that contains a cathode-ray tube Cathode-ray tube (CRT) is a large sealed glass tube. The front of the tube is the screen. CRT available in various size, with the more common being 15, 17, 19, 21 and 22
inches Page 313 Figure 6-10 Discovering Computers 2012: Chapter 6 16 17 Printers A printer produces text and graphics on
a physical medium Printed information is called a hard copy, or printout Landscape or portrait orientation Page 313 Figure 6-11 Discovering Computers 2012: Chapter 6 18 Printers Before purchasing a printer, ask yourself a series of questions:
21 Printers An ink-jet printer forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper Color or black-and-white Printers with a higher dpi (dots per inch) produce a higher quality output The speed of it is measured by the number of pages per minute (ppm) it can print. Most ink-jet print from 3 to 26 ppm. Pages 316 317 Figure 6-15 Discovering Computers 2012: Chapter 6
22 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 Page 318 Discovering Computers 2012: Chapter 6
Is a high-speed, high-quality nonimpact printer. Printer speeds: For home and small office --Black & white text (15 to 50 ppm), Color (4 to 27 ppm). For large business users print more than 150 ppm. Color laser printers are slightly higher price than otherwise 26 Printers A multifunction peripheral (MFP) is a single device that prints, scans, copies, and in some
cases, faxes Sometimes called an all-in-one device Pages 320 321 Figure 6-20 Discovering Computers 2012: Chapter 6 27 Printers A thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper Page 321
Figure 6-21 Discovering Computers 2012: Chapter 6 28 Printers 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 Mobile printers fit easily in a briefcase alongside a notebook computer.
Mobile printers mainly use ink-jet or thermal technology. Page 321 Figure 6-22 Discovering Computers 2012: Chapter 6 29 Printers 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 Page 322
Figure 6-23 Discovering Computers 2012: Chapter 6 30 Printers Plotters are used to produce high-quality drawings Large-format printers create photo-realistic quality color prints on a larger scale Used in specializes fields such as engineering and drafting and usually are very costly. Using ink-jet printer technology, but on much larger scale. Page 322
Figure 6-24 Discovering Computers 2012: Chapter 6 31 Printers Impact printers form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper Dot-matrix printer Pages 322 - 323 Line
printer Discovering Computers 2012: Chapter 6 32 Printers A dot-matrix printer produces printed images when tiny wire pins on a print head mechanism strike an inked ribbon A line printer prints an entire line at a time
Page 323 Figure 6-25 Discovering Computers 2012: Chapter 6 33 Audio Output Device Discovering Computers 2012: Chapter 6 34 Speakers, Headphones, and Earbuds An audio output device produces music, speech, or other sounds
Most personal computers have a small internal speaker that usually emits only low-quality sound. Most computer users attach speakers to their computers to: Page 323 Figure 6-26 Generate higher-quality sounds for playing games Interact with multimedia presentations Listen to music Discovering Computers 2012: Chapter 6
35 Speakers, Headphones, and Earbuds Headphones are speakers that cover or are placed outside of the ear Earbuds (also called earphones) rest inside the ear canal Page 324 Figure 6-27 Discovering Computers 2012: Chapter 6
36 Speakers, Headphones, and Earphones Speakers typically have tone and volume controls, allowing users to adjust settings. In many cases, users connect the speakers to ports on the sound card. 37
Speakers, Headphones, and Earbuds Some speakers are specifically designed to play audio from a portable media player Wireless speakers Page 324 Figure 6-28 Discovering Computers 2012: Chapter 6 38 Speakers, Headphones, and Earbuds Voice output occurs when you hear a
persons 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 Page 325 Discovering Computers 2012: Chapter 6 39 Other Output Devices Other output devices are available for specific uses and applications
Page 325 Data projectors Interactive whiteboards Force-feedback game controllers Tactile output Discovering Computers 2012: Chapter 6 40
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 Pages 325 - 326 Figure 6-29 Discovering Computers 2012: Chapter 6
41 Other Output Devices An interactive whiteboard is a touch-sensitive device, resembling a dry-erase board, that displays the image on a connected computer screen Page 326 Figure 6-30 Discovering Computers 2012: Chapter 6 42
Output Devices for Physically Challenged Users Many accessibility options exist for users with various disabilities Pages 328 - 329 Figures 6-33 6-34 Discovering Computers 2012: Chapter 6 43 Summary Various methods of output
Several commonly used output devices Display devices, printers, speakers, headphones, earbuds, data projectors, interactive whiteboards, force-feedback game controllers, and tactile output Page 329 Discovering Computers 2012: Chapter 6 44
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