20-Dec-16. Objectives Overview. What Is Output? Objectives Overview. What Is Output? Display devices. Discovering Computers 2012
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1 Objectives Overview Describe the types of output Explain the characteristics of various display devices Describe the factors that affect the quality of an LCD monitor or LCD screen Discovering Computers 2012 Your Interactive Guide to the Digital World Course Instructor: Imran Khalil MSc-IT 1 st Semester Department of CS& IT UOS Lahore Campus Describe various ways to print Differentiate between a nonimpact and an impact See Page 303 for Detailed Objectives Discovering Computers 2012: Chapter 6 2 Objectives Overview What Is Output? Summarize the characteristics of ink-jet, photo, laser, multifunction peripherals, thermal, mobile, label and postage, and plotters and large-format Describe the uses and characteristics of speakers, headphones, and earbuds Output is data that has been processed into a useful form 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 Pages 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 Speakers, headphones, and earbuds Data projectors A display device visually conveys text, graphics, and video information A monitor is packaged as a separate peripheral LCD monitor Widescreen Interactive whiteboards Force-feedback game controllers Tactile output Page 305 Discovering Computers 2012: Chapter 6 5 Pages Figures Discovering Computers 2012: Chapter 6 6 1
2 Liquid crystal display (LCD) uses a liquid compound to present information on a display device The quality of an LCD monitor or LCD screen depends primarily on: Resolution Response time Brightness Dot pitch Contrast ratio Page 308 Discovering Computers 2012: Chapter 6 7 Pages Discovering Computers 2012: Chapter 6 8 Resolution is the number of horizontal and vertical pixels in a display device A higher resolution uses a greater number of pixels 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 DisplayPort Pages Figure 6-5 Discovering Computers 2012: Chapter 6 9 Page 310 Figure 6-6 Discovering Computers 2012: Chapter 6 10 Plasma monitors are display devices that use gas plasma technology and offer screen sizes up to 150 inches 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 311 Figure 6-8 Discovering Computers 2012: Chapter 6 11 Page 312 Figure 6-9 Discovering Computers 2012: Chapter
3 A CRT monitor is a desktop monitor that contains a cathode-ray tube Have a much larger footprint than do LCD monitors A produces text and graphics on a physical medium Printed information is called a hard copy, or printout Landscape or portrait orientation Page 313 Figure 6-10 Discovering Computers 2012: Chapter 6 13 Page 313 Figure 6-11 Discovering Computers 2012: Chapter 6 14 Before purchasing a, ask yourself a series of questions: Page 314 Figure 6-12 Discovering Computers 2012: Chapter 6 15 Page 315 Figure 6-13 Discovering Computers 2012: Chapter 6 16 A nonimpact forms characters and graphics on a piece of paper without actually striking the paper Ink-jet Photo Laser Thermal An ink-jet forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper Color or black-and-white with a higher dpi (dots per inch) produce a higher quality output Mobile Label and postage Plotters Largeformat Page 315 Discovering Computers 2012: Chapter 6 17 Pages Figure 6-15 Discovering Computers 2012: Chapter
4 A photo 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 317 Figure 6-16 Discovering Computers 2012: Chapter 6 19 Page 318 Discovering Computers 2012: Chapter 6 20 Highspeed Highquality Blackandwhite Laser Color Page 318 Figure 6-17 Discovering Computers 2012: Chapter 6 21 Pages Discovering Computers 2012: Chapter 6 22 A multifunction peripheral (MFP) is a single device that prints, scans, copies, and in some cases, faxes Sometimes called an all-in-one device Page 320 Figure 6-19 Discovering Computers 2012: Chapter 6 23 Pages Figure 6-20 Discovering Computers 2012: Chapter
5 A thermal generates images by pushing electrically heated pins against the heat-sensitive paper Thermal wax-transfer Dye-sublimation A mobile is a small, lightweight, battery-powered that allows a mobile user to print from a notebook computer, smart phone, or other mobile device Page 321 Figure 6-21 Discovering Computers 2012: Chapter 6 25 Page 321 Figure 6-22 Discovering Computers 2012: Chapter 6 26 A label is a small that prints on adhesive-type material A postage prints postage stamps Postage also can be printed on other types of Plotters are used to produce high-quality drawings Large-format create photo-realistic quality color prints on a larger scale Page 322 Figure 6-23 Discovering Computers 2012: Chapter 6 27 Page 322 Figure 6-24 Discovering Computers 2012: Chapter 6 28 Impact form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper Dot-matrix Line A dot-matrix produces printed images when tiny wire pins on a print head mechanism strike an inked ribbon A line prints an entire line at a time Pages Discovering Computers 2012: Chapter 6 29 Page 323 Figure 6-25 Discovering Computers 2012: Chapter
6 Speakers, Headphones, and Earbuds Speakers, Headphones, and Earbuds An audio output device produces music, speech, or other sounds Most computer users attach speakers to their computers to: Generate higher-quality sounds for playing games Interact with multimedia presentations Listen to music View movies Headphones are speakers that cover or are placed outside of the ear Earbuds (also called earphones) rest inside the ear canal Page 323 Figure 6-26 Discovering Computers 2012: Chapter 6 31 Page 324 Figure 6-27 Discovering Computers 2012: Chapter 6 32 Speakers, Headphones, and Earbuds Speakers, Headphones, and Earbuds Some speakers are specifically designed to play audio from a portable media player Wireless speakers Voice output occurs when you hear a person s 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 324 Figure 6-28 Discovering Computers 2012: Chapter 6 33 Page 325 Discovering Computers 2012: Chapter 6 34 Other Output Devices Other Output Devices Other output devices are available for specific uses and applications Data projectors Force-feedback game controllers Interactive whiteboards Tactile output 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 Page 325 Discovering Computers 2012: Chapter 6 35 Pages Figure 6-29 Discovering Computers 2012: Chapter
7 Other Output Devices 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 Force-feedback sends resistance to the device in response to actions of the user Tactile output provides the user with a physical response from the device Page 326 Figure 6-30 Discovering Computers 2012: Chapter 6 37 Pages Figure 6-31 Discovering Computers 2012: Chapter 6 38 Putting It All Together Putting It All Together Page 327 Figure 6-32 Discovering Computers 2012: Chapter 6 39 Page 327 Figure 6-32 Discovering Computers 2012: Chapter 6 40 Putting It All Together Output Devices for Physically Challenged Users Many accessibility options exist for users with various disabilities Page 327 Figure 6-32 Discovering Computers 2012: Chapter 6 41 Pages Figures Discovering Computers 2012: Chapter
8 Summary Various methods of output Several commonly used output devices Page 329 Display devices,, speakers, headphones, earbuds, data projectors, interactive whiteboards, force-feedback game controllers, and tactile output Discovering Computers 2012: Chapter 6 43 Discovering Computers 2012 Your Interactive Guide to the Digital World Chapter 6 Complete Course Instructor: Imran Khalil MSc-IT 1 st Semester Department of CS& IT UOS Lahore Campus 8
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