meljun cortes computer information processing chapter 4 with notes

7/31/2019 MELJUN CORTES Computer Information Processing Chapter 4 With Notes

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CCT101: Chapter 4

Output


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OBJECTIVES

Define the four types of output

Identify the different types of display devices

Describe factors that affect the quality of a monitor

Understand the purpose of a video card Explain the differences among various types of printers

List various types of audio output devices

Identify the purpose of data projectors, fax machines,and multifunction devices

Explain how a terminal is both an input and outputdevice


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WHAT IS OUTPUT?

Text

Graphics

Audio Video


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WHAT ARE OUTPUT DEVICES?

Any computer component capable of conveying

information to a user

Printers

Speakers


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DISPLAY DEVICES

An output device that visually conveys text,

graphics, and video information

Monitors


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DISPLAY DEVICES

CRT Monitors

Screen housed in a plastic or metal case

Color monitor

Monochrome monitor

Cathode ray tube (CRT)

Pixels

Viewable size


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DISPLAY DEVICES

Flat-panel displays

LCD displays

Lightweight

Used by handheld computers Active and passive-matrix displays

Active-matrix displays uses a separate transistor for each

color pixel

Passive-matrix displays uses fewer transistors

Also used with desktop computers


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DISPLAY DEVICES

Gas Plasma

Are larger in screen size

Large business or power users prefer this

Higher display quality compared to LCD

But more expensive


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DISPLAY DEVICES

Monitor Quality Resolution - sharpness and clarity

Higher resolution means smaller images display

Dot pitch

Vertical distance between each pixel

Refresh rate Speed with which a monitor redraws images on the

screen

Should be fast enough to maintain a constant image

Interlacing:

It causes images to flicker

But nowadays computer is flicker-free images becausenon-interlaced


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DISPLAY DEVICES

Video Cards

Converts digital output into an analog video signal that is sent

through a cable to a monitor


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PRINTERS

An output device that produces text and graphics on a

physical medium such as paper or transparency film

Hard copy (printout)


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PRINTERS

Impact Printers

Printing mechanism strikes paper, ribbon and character together

Used for multipart forms


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PRINTERS

Impact Printers

Dot matrix printers

Small dots form characters

Continuous form paper More pins on print head means higher quality

Speed measured in characters per second (cps)


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PRINTERS

Impact Printers

Line printers

High speed

Prints an entire line at a time


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PRINTERS

Non-impact Printers

No mechanism strikes the paper

Much quieter than impact printers


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PRINTERS

Non-impact Printers

Ink-jet printers

Spray tiny drops of ink onto the paper

Both black-and-white and color

Resolution measured in dots per inch (dpi)

Speed measured in pages per minute (ppm)

Nozzles spray ink


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PRINTERS (Non-impact Printers)

Laser printers

High-speed, high-quality nonimpact printer

Very high quality resolution - 600dpi to 1,200 dpi

Stores entire page before printing it Operates much like a copy machine

Toner


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Portable printers

Small, lightweight printer that allows a mobile user to print from a

laptop or handheld computer while traveling

Ink-jet

Parallel port or infrared port


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Thermal printers

Generates images by pushing electrically heated pins against

heat-sensitive paper


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Plotters and Large-Format printers

Used for high-quality drawings such as blueprints, maps, circuit

diagrams, and signs


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Special-purpose printers

Photo printer

Color printer designed to produce lab quality pictures directly from a

digital camera Label printer

Prints on an adhesive-type material that can be placed on

envelopes, disks and etc

Print bar codes


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AUDIO OUTPUT

Audio output devices

Produce music, speech, or other sounds

Speakers

Headsets


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OTHER OUTPUT DEVICES

Data projectors

Allows an audience to view output

LCD projectors

Uses its own light source to display the information shown on thecomputer screen

Digital light processing (DLP) projector

Uses tiny mirrors to get sharper and brighter images


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Facsimile (Fax) Machine

Used to transmit and receive an image of a document over a

phone line

Stand-alone fax machine

Scans the source document

converts images into digitized data

Transmits the digitized image

Fax modem


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Multifunction Devices

Can print, scan, copy, and fax

Less space

Lower cost than separate units


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TERMINALS

Performs both input and output

Monitor

Keyboard

Video card


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TERMINALS

Terminal types

Dumb terminal

Has no processing power

Intelligent terminal/ Programmable terminal

Has memory and processing capability

Special-purpose terminal

Perform specific tasks and contain features uniquely

designed for use in a particular industry

Point-of-sale (POS) terminal Automatic teller machine (ATM)

meljun cortes computer information processing chapter 4 with notes

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