Chapter 6: OutputChapter 6: Output

Slides Created by Slides Created by Kevin McHaleKevin McHale

The Four Categories of OutputThe Four Categories of Output

Output is data that has been processed into a Output is data that has been processed into a useful deviceuseful device

Four CategoriesFour Categories– TextText– GraphicsGraphics– AudioAudio– VideoVideo

CRT Monitors CRT Monitors

Desktop monitors that are similar to Desktop monitors that are similar to televisions because they contain televisions because they contain Cathode Ray Tubes (CRT)Cathode Ray Tubes (CRT)

Available in a variety of sizesAvailable in a variety of sizes– Most common range from 15 to 22 inchesMost common range from 15 to 22 inches

Use electron beams to produce imagesUse electron beams to produce images

Quality of CRT MonitorQuality of CRT Monitor

Three factors affect the monitor’s qualityThree factors affect the monitor’s quality

– ResolutionResolution

– Dot Pitch (Pixel Pitch)Dot Pitch (Pixel Pitch)

– Refresh RateRefresh Rate

Graphics CardsGraphics CardsConverts digital output from the computer into Converts digital output from the computer into an analog video signalan analog video signal

Sends the signal through a cable to the CRT Sends the signal through a cable to the CRT monitormonitor

Monitor displays the Monitor displays the output on the screenoutput on the screen

The number of colors a graphics card displays The number of colors a graphics card displays is determined by its bit depthis determined by its bit depth

Flat Panel DisplayFlat Panel Display

A flat panel display is a display with a shallow A flat panel display is a display with a shallow depth that does not use CRT technologydepth that does not use CRT technology

Types of flat panel displaysTypes of flat panel displays– Flat panel monitorsFlat panel monitors– LCD displaysLCD displays– Gas Plasma displaysGas Plasma displays– HDTV displaysHDTV displays

Flat Panel DisplaysFlat Panel Displays

A flat panel monitor is A flat panel monitor is a desktop monitor a desktop monitor that uses a liquid that uses a liquid crystal display instead crystal display instead of a cathode-ray tubeof a cathode-ray tube

A liquid crystal display A liquid crystal display (LCD) uses a liquid (LCD) uses a liquid compound to present compound to present information on a information on a screenscreen

Gas Plasma DisplaysGas Plasma Displays

A gas plasma display A gas plasma display uses gas plasma uses gas plasma technologytechnology

Substitutes a layer of Substitutes a layer of gas for the liquid gas for the liquid crystal material in a crystal material in a flat panel monitorflat panel monitor

High-Definition TelevisionHigh-Definition Television

HDTV is the most advanced form of digital HDTV is the most advanced form of digital televisiontelevision– Provides resolution up to 1920 x 1080 pixelsProvides resolution up to 1920 x 1080 pixels– Works with digital broadcasting signalsWorks with digital broadcasting signals– Transmits digital soundTransmits digital sound– Supports wide screensSupports wide screens

PrintersPrinters

A printer is an output device that produces text A printer is an output device that produces text and graphics on a physical mediumand graphics on a physical medium

Two types of printersTwo types of printers– Impact Printers Impact Printers

– Nonimpact PrintersNonimpact Printers

Impact PrintersImpact Printers

Impact printers form characters and graphics Impact printers form characters and graphics on a piece of paper by striking a mechanism on a piece of paper by striking a mechanism against an inked ribbon that physically against an inked ribbon that physically contacts the papercontacts the paper

Types of Impact PrintersTypes of Impact Printers– Dot-matrix printerDot-matrix printer– Line printerLine printer

Nonimpact PrintersNonimpact Printers

Nonimpact printers form characters and Nonimpact printers form characters and graphics on a piece of paper without actually graphics on a piece of paper without actually striking the paperstriking the paperTypes of nonimpact printersTypes of nonimpact printers– Ink-jet printersInk-jet printers– Laser printers Laser printers – Photo printersPhoto printers– Large format printersLarge format printers– Thermal printersThermal printers– Portable printersPortable printers– Label and postage printersLabel and postage printers– PlottersPlotters

Nonimpact PrintersNonimpact Printers

An ink-jet printer forms characters and An ink-jet printer forms characters and graphics by spraying tiny drops of liquid ink graphics by spraying tiny drops of liquid ink onto a piece of paperonto a piece of paper

A photo printer produces A photo printer produces

photo-lab –quality picturesphoto-lab –quality pictures

Nonimpact Printers (Cont)Nonimpact Printers (Cont)

A laser printer is a high-speed, high-quality A laser printer is a high-speed, high-quality printer that creates images using a laser printer that creates images using a laser beam and powdered ink, called tonerbeam and powdered ink, called toner

A thermal printer generates images by A thermal printer generates images by pushing electronically pushing electronically

heated pins against heat heated pins against heat

sensitive papersensitive paper

Nonimpact Printers (Cont)Nonimpact Printers (Cont)

A portable printer is a small, lightweight, A portable printer is a small, lightweight, battery-powered printer used for notebook battery-powered printer used for notebook computerscomputers

A label printer is a small A label printer is a small

printer that prints on an printer that prints on an

adhesive-type materialadhesive-type material

Nonimpact Printers (Cont)Nonimpact Printers (Cont)

Plotters are sophisticated printers used to Plotters are sophisticated printers used to produce high-quality drawingsproduce high-quality drawings

A large-format printer uses ink-jet technology A large-format printer uses ink-jet technology on a large scale to create photo-on a large scale to create photo-

realistic-quality color printsrealistic-quality color prints

Wireless Printing TechnologyWireless Printing Technology

Infrared PrintingInfrared Printing– A printer communicates with a device using A printer communicates with a device using

infrared light wavesinfrared light waves

Bluetooth PrintingBluetooth Printing– A device transmits output to a printer via radio A device transmits output to a printer via radio

waveswaves

Audio Output DevicesAudio Output Devices

Audio output devices Audio output devices are components of a are components of a computer that computer that produce soundproduce sound

Types of Audio Types of Audio Output DevicesOutput Devices– SpeakersSpeakers– HeadphonesHeadphones

FaxFax

A fax machine (facsimile machine) is a device A fax machine (facsimile machine) is a device that transmits and receives documents over that transmits and receives documents over telephone linestelephone lines– A fax is a document sent or receivedA fax is a document sent or received

Fax modems allow you Fax modems allow you

to send and sometimes to send and sometimes

receive electronic receive electronic

documents as faxesdocuments as faxes

Other Output DevicesOther Output Devices

Multifunction peripherals provide the Multifunction peripherals provide the functionality of a printer, scanner, copy functionality of a printer, scanner, copy machine, and a fax machinemachine, and a fax machine

Data projectors take the image Data projectors take the image

form a computer screen and project form a computer screen and project

it onto a larger screen for an audience it onto a larger screen for an audience

to viewto view

Output OptionsOutput Options

Hearing impaired users can instruct Hearing impaired users can instruct programs to display words instead of programs to display words instead of soundsound

Visually impaired users can enlarge items Visually impaired users can enlarge items on the screen and change settings to on the screen and change settings to increase readabilityincrease readability

Blind users can work with voice output Blind users can work with voice output instead of a monitor and Braille printersinstead of a monitor and Braille printers