Chapter 6Output

video

audio

textgraphics

What is Output?

What Is output? Data that has

been processed into a useful form, called information

p. 6.2 Fig. 6-1

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What Are Output Devices?

What is an output device? Any hardware component that can convey

information to a user

printer

monitor

Click to view video

p. 6.4

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speakers

Display Devices

What is a display device? Television-like Information on a

display device sometimes is called soft copy

p. 6.4

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Large sealed, glass screen

Screen coated with tiny dots of phosphor material

Pixel, or picture element, is single point in electronic image

Three dots (red, blue, and green) combine to make up each pixel

Display Devices

What is a CRT monitor?

CRT monitor screen

cathode ray tube

p. 6.5 Fig. 6-3

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Display Devices

What is a liquid crystal display (LCD) monitor? Type of flat-panel

display Uses liquid crystals

between two sheets of material to present information on screen

Electric current passes through crystals, which creates images on the screen

p. 6.5 Fig. 6-4

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Display Devices

Where are some features of LCD screens? Lightweight and

compact Consumes less

than one-third of the power than does a CRT monitor

Ideal for notebook and handheld computers

p. 6.6 Fig. 6-5

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Display Devices

What are the two technologies used for LCD monitors?

Passive-matrix display

• Color often not as bright

• Images best viewed when working directly in front of display

Active-matrix display

• Can display high-quality color viewable from all angles

p. 6.8

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Should be fast enough to maintain a constant, flicker-free

image

High-quality monitor will provide

refresh rate of at least 75 hertz

Display Devices

What is refresh rate? Speed at which

monitor redraws images on the screen

Image on the screen redraws itself 75 times per second

p. 6.9

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Printers

What is a printer? Output device that

produces text and graphics on paper

Result is hard copy, or printout

Two orientations

portrait orientation

portrait orientation

landscape orientation

landscape orientation

Click to view animation

p. 6.12 Fig. 6-14

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Printers

What is an impact printer? Forms characters by striking

a mechanism against ink ribbon that physically contacts paper

Ideal for printing multipart forms

Can withstand dusty environments, vibrations, and extreme temperatures

p. 6.14

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Printers

What is a dot-matrix printer? Impact printer that produces printed images when tiny

wire pins on print head mechanism strike inked ribbon Most use continuous-form paper

continuous-form paper

p. 6.14 Fig. 6-17

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Printers

What is a non-impact printer? Forms characters

and graphics on piece of paper without actually striking paper

p. 6.15

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ink-jet printer

thermal printer

laser printer

Printers

What is an ink-jet printer? Nonimpact printer

forms characters and graphics by spraying tiny drops of liquid ink onto piece of paper

Most popular type of color printer for home use

Click to view Web Linkthen click Ink-Jet Printers

p. 6.15 Fig. 6-19

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Printers

What is the resolution of a printer? Sharpness and clarity of characters Measured by number of dots per inch (dpi)

printer canoutput

300 dpi 1,200 dpi600 dpi

p. 6.15 Fig. 6-20

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Printers

What is a laser printer? High-speed, high-

quality nonimpact printer

Prints text and graphics in very high-quality resolution, ranging from 600 to 1,200 dpi

Typically costs more than ink-jet printer, but is much faster

Click to view Web Linkthen click Laser Printers

p. 6.16 Fig. 6-17

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Printers

What is a plotter?

p. 6.22

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Sophisticated printer used to produce high-quality drawings

Large-format printer similar to plotter and is used to print quality color prints

plotter

large-format printer

Speakers and Headsets

What is an audio output device? Computer component that produces music,

speech, and other sounds Speakers and headsets are common devices

p. 6.23 Fig. 6-29

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speakers