Discovering Computers 2012Chapter 6Understanding Output

(1)

Your Interactive Guide to the Digital World

Discovering

Computers 2012 Chapter 6

Understanding Output

(2)

Objectives Overview

Describe the types of output

Explain the characteristics of

various display devices

Explain the characteristics of

various display devices

Describe the factors that affect the quality

of an LCD monitor or LCD screen

Describe the factors that affect the quality

of an LCD monitor or LCD screen

Describe various ways to print Describe various

ways to print

Differentiate between a

nonimpact printer and an impact printer

Differentiate between a

nonimpact printer and an impact printer

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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

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 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 the purpose and features of data projectors, interactive whiteboards, and force-feedback game controllers

and tactile output

Identify output options for physically challenged users Identify output options for physically challenged users

Discovering Computers 2012: Chapter 6 3

See Page 303

for Detailed Objectives

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What Is Output?

• Output is data that has been processed into a useful form

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What Is Output?

• An output device is any type of hardware

component that conveys information to one or more people

Page 305

Display devices

Display devices PrintersPrinters Speakers, headphones,

and earbuds Speakers, headphones,

and earbuds Data projectorsData projectors

Interactive whiteboards

Force-feedback game controllers Force-feedback

game

controllers Tactile outputTactile output

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Display Devices

• A display device visually conveys text, graphics, and video information

• A monitor is packaged as a separate peripheral

– LCD monitor – Widescreen

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Display Devices

• Liquid crystal display (LCD) uses a liquid

compound to present information on a display device

Page 308

Active-matrix

display Passive-matrix

display

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Display Devices

• The quality of an LCD monitor or LCD screen depends primarily on:

Resolution

Resolution Response timeResponse time BrightnessBrightness

Dot pitch

Dot pitch Contrast ratioContrast ratio

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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

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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 DisplayPort

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Display Devices

• Plasma monitors are display devices that use gas plasma technology and offer screen sizes up to 150 inches

Page 311 Figure 6-8

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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, higher- quality output

• HDTV is the most advanced form of digital television

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Video: SID: Size Matters

CLICK TO START

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Display Devices

• A CRT monitor is a desktop monitor that contains a cathode-ray tube

– Have a much larger footprint than do LCD monitors

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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

increase

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Printers

Before purchasing a printer, ask yourself a series of questions:

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Discovering Computers 2012: Chapter 6 17 Page 315

Figure 6-13

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Printers

• A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper

Ink-jet printers

Ink-jet

printers Photo

printers Photo

printers Laser

printers Thermal printers Thermal

printers

Mobile printers Mobile printers

Label and postage Label and

postage

printers PlottersPlotters Large- format

Large- format printers

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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

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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

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Printers

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Printers

Laser printer

High- speed

High- quality

Color Color Black-

and- white Black- and- white

Pages 319 - 320

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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

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Printers

• A thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper

Thermal wax-transfer printer

Dye-sublimation printer

Dye-sublimation

printer

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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

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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

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Printers

• Plotters are used to produce high-quality drawings

• Large-format printers create photo-realistic quality color prints on a larger scale

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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

Line printer

Line

printer

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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

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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

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

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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

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Speakers, Headphones, and Earbuds

• Some speakers are specifically designed to play audio from a portable media player

– Wireless speakers

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Speakers, Headphones, and Earbuds

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 325

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Other Output Devices

• Other output devices are available for specific uses and applications

Data projectors

Data projectors Interactive whiteboards

Interactive whiteboards

Force-feedback game

Force-feedback

game Tactile outputTactile output

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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

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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

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Other Output Devices

• 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

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Putting It All Together

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Putting It All Together

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Putting It All Together

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Output Devices

for Physically Challenged Users

• Many accessibility options exist for users with various disabilities

Pages 328 - 329 Figures 6-33 – 6-34

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Summary

Various methods of output

Various methods of output Several commonly used output devices

Several commonly used output devices

Display devices, printers, speakers, headphones, earbuds, data projectors,

interactive whiteboards, force-feedback game Display devices, printers,

speakers, headphones, earbuds, data projectors,

interactive whiteboards, force-feedback game

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Your Interactive Guide to the Digital World

Discovering

Computers 2012 Chapter 6

Understanding Output

Chapter 6 Complete

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Project due Nov. 14

• MIDI: Musical Instrument Digital Interface

• Use MIDI to edit and play London Bridge or your favorite song.

• For example: Mary has a little sheep: 3212 333 222 355 3212 333 22321.