CSC1100 - Chapter04 - Output

Discovering Computers 2008

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Chapter 4Chapter 4Chapter 4Chapter 4

OutputOutputOutputOutput

Chapter 6 ObjectivesChapter 6 ObjectivesChapter 6 ObjectivesChapter 6 Objectives

Describe the four categories of outputDescribe the four categories of output

Summarize the characteristics of LCD monitors, LCD screens, and plasma monitors

Summarize the characteristics of LCD monitors, LCD screens, and plasma monitors

Describe the characteristics of a CRT monitor and Describe the characteristics of a CRT monitor and

Summarize the characteristics of ink-jet printers, photo printers, laser printers, 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, thermal printers,

mobile printers, label and postage printers,and plotters and large-format printers

Describe the uses of speakers, headphones,Describe the uses of speakers, headphones,

Differentiate between a nonimpact printer and an impact printer

Differentiate between a nonimpact printer and an impact printer

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Describe the characteristics of a CRT monitor and factors that affect its quality

Describe the characteristics of a CRT monitor and factors that affect its quality

Explain the relationship between graphics chips and monitors

Explain the relationship between graphics chips and monitors

Describe various ways to printDescribe various ways to print

Describe the uses of speakers, headphones,and earphones

Describe the uses of speakers, headphones,and earphones

Identify the output characteristics of fax machines and fax modems, multifunction peripherals, data

projectors, joysticks, wheels, and gamepads

Identify the output characteristics of fax machines and fax modems, multifunction peripherals, data

projectors, joysticks, wheels, and gamepads

Identify output options for physicallychallenged users

Identify output options for physicallychallenged users

Learning OutcomeLearning OutcomeLearning OutcomeLearning Outcome

Successful students will be able to:

Describe the characteristics of computer hardware devices and explain their functionalities.

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What is Output?What is Output?What is Output?What is Output?

What is output?� Data that has been processed into a useful form

� Output device is any hardware component that can convey information to one or more people

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Display DevicesDisplay DevicesDisplay DevicesDisplay Devices

What are some mobile devices that have LCD screens?

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What is a display device?� Output device that visually conveys text,

graphics, and video information� Information on display device sometimes

called soft copy� Monitor houses display device that is packaged

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� Monitor houses display device that is packaged as separate peripheral


What is an LCD monitor (flat panel)?� Uses L iquid Crystal Display� Produce sharp, flicker-free images� Have a small footprint� Some are wall mountable� LCD monitor sizes: 15,17,18,19,20,21,22,23 inches

� Measured diagonally

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� Measured diagonally� Mobile devices that contain LCD screens include:

� Notebook computer (14.1,15.4,17,20.1 inches),� Tablet PC (8.4 – 14.1 inches), � ultra personal computer (5 – 7 inches), � portable media player (1.5 – 3 inches), � smart phone (2.5 – 3.5 inches), and � PDA (average of 3.5 inches)

FlatFlatFlatFlat----Panel DisplaysPanel DisplaysPanel DisplaysPanel Displays

What about using multiple LCD monitors?� Some users position two or more monitors side-

by-side or stacked� Position 2 monitors together for wider screen area

� Convenient to run multiple programs simultaneously – music editors, web developers,

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simultaneously – music editors, web developers, video editors, researchers, gamers, engineers,..

LCD

QUALITY

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LCD

QUALITY

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What is resolution?

� Sharpness and clarity of image

� Number of horizontal and vertical pixels in a display device

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clarity of image

� Higher resolution makes image sharper, displays more text on screen, makes some elements smaller


How do you use an LCD monitor with a video card?� GPU, Graphic processing unit: graphics chip – control

manipulation & display of graphics on a display device� integrated on motherboard or � on video card (graphics card) in a slot on motherboard

�Video card contain a fan/heat sink

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�Video card contain a fan/heat sink� LCD monitor use digital signal – plugged in a Digital Video

Interface (DVI ) port a computer� System unit has integrated DVI chip or contain a video card with

� a DVI port, � standard monitor port & � an S-video port (connect DVD player/video recorder to

computer)


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standard monitorport

S-video port

DVI port

Plasma MonitorPlasma MonitorPlasma MonitorPlasma Monitor

What is a plasma monitor?� Displays image by applying voltage to layer of gas

� Larger screen size and richer colors than LCD, but are more expensive

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LCD & Plasma TechnologiesLCD & Plasma TechnologiesLCD & Plasma TechnologiesLCD & Plasma Technologies

LCD technology:�Contain fluorescent tubes that

emit light waves towards liquid-crystal cells, which are sandwiched btw 2 sheets of material

�Electrical charges passes

Plasma monitor features:�More than 60 inches width�Larger screen sizes & richer

colors�More expensive�Also can hand directly on wall

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�Electrical charges passes through the cells

�Cells twist – cause some light waves to be blocked & allow others to pass through –creating images on the display

Plasma gas technology:�Sandwiches a layer of gas btw

2 glass plates�Voltage applied – gas releases

ultraviolet (UV) light – cause pixels on screen to glow & form images


What is digital television (DTV) and high-definition television (HDTV)?

Many programs can bebroadcast on a single

digital channel

All broadcast stationstransmit digital signals

High resolution

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Great for game playing, watching movies, and browsing the Internet

HDTV HDTV (high(high--definition television)definition television)is the most advanced form

of digital TV

Uses digital signals to producecrisper, higher-quality output

on LCD and plasma televisions

CRT MonitorsCRT MonitorsCRT MonitorsCRT Monitors

What is a CRT monitor?� Contains cathode-ray

tube (CRT)� Screen coated with tiny

dots of phosphor material� Each dot consists of a red,

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� Each dot consists of a red, blue, and green phosphor

� Common sizes are 15, 17, 19, 21, and 22 inches� Viewable size is diagonal

measurement of actual viewing area


�CRT - Large, sealed glass tube

�Screen placed the front of the tube

�Screen coated by tiny dots of phosphor material� Each dot (each pixel) has a red, a green & a blue phosphor

�Electron beam moves back & forth across the back of the screen –cause dots of screen to glow, producing images on screen

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cause dots of screen to glow, producing images on screen

�Less expensive, produce more heat & uses more power than LCD

�Produce less Electromagnetic Radiation(EMR )� Magnetic field travel at speed of light but for short distance� High quality CRT apply MPR II standards – have acceptable

EMR levels for monitors


What is theENERGY STAR program?� Encourages manufacturers to create energy-efficient

devices that require little power when not in use� Monitors and devices meeting guidelines display

ENERGY STAR label

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What determines the quality of a CRT monitor?� Screen resolution

� Refresh rate/scan rate (in Hz, e.g. 68Hz) :� Speed at which monitor redraws images on screen� Num of times image is drawn per second

� Text created with a smaller dot pitch is easier to read

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� Num of times image is drawn per second� Should be fast enough to maintain a constant flicker-

free image

PrintersPrintersPrintersPrinters

What is a printer ?� Output device that

produces text and graphics on a physical medium

� Result ishard copy, or

portrait

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� Result ishard copy, orprintout

� Two orientations: portraitand landscape

landscape

SpeedSpeedSpeedSpeed


How do you know which printer to buy?

BudgetBudgetBudgetBudgetColor orColor or

black and whiteblack and whiteColor orColor or

black and whiteblack and white

� Depends on printing needs

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Cost per pageCost per pageCost per pageCost per page Paper typesPaper typesand sizesand sizes

Paper typesPaper typesand sizesand sizes

Graphics and Graphics and photo printingphoto printingGraphics and Graphics and photo printingphoto printing

Multiple copiesMultiple copiesMultiple copiesMultiple copies

SystemSystemcompatibilitycompatibility

SystemSystemcompatibilitycompatibility

WirelessWirelesscapabilitycapabilityWirelessWireless

capabilitycapabilityFuture needsFuture needsFuture needsFuture needs


What are the various ways to print documents and pictures?

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What is a nonimpact printer?� Forms characters and graphics without striking paper

� Ink-jet printer� sprays tiny drops of liquid ink onto paper or� uses heat or pressure to create images� Prints in black-and-white or color on a variety

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� Prints in black-and-white or color on a variety of paper types


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

can output

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How does an ink-jet printer work?print head

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Step 1. A small resistor heats the ink, causing the ink to boil and form a vapor bubble.

Step 2. The vapor bubble forces the ink through the nozzle.

Step 3. Ink drops onto the paper.

Step 4. As the vapor bubble collapses, fresh ink is drawn into the firing chamber.

print cartridge

firing chamber

nozzlebubble resistor ink

ink dot


What is a photo printer?� Color printer that produces

photo-lab-quality pictures� Many photo printers have a

built-in card slot� PictBridge is a standard

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� PictBridge is a standard technology that allows you to print pictures directly from a digital camera


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

nonimpact printer� Prints text and graphics in

high-quality resolution, ranging from 1,200 to 2,400 dpi

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ranging from 1,200 to 2,400 dpi� Typically costs more than

ink-jet printer, but is much faster


How does a laser printer work?

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What is a thermal printer ?� Generates images by pushing electrically heated pins

against heat-sensitive paper� Dye-sublimation printer (also called a digital photo printer)

uses heat to transfer dye to specially coated paper

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What is a mobile printer?� Small, lightweight, battery-powered printer that allows

mobile user to print from notebook computer, Tablet PC, PDA, or smart phone while traveling

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What are label printers and postage printers?� Small printer that prints on adhesive-type material

� Postage printer has built-in digital scale and printspostage stamps

� Most also print bar codes

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What is a plotter?� Sophisticated printer used to produce high-quality

drawings� Large-format printer creates photo-realistic-quality

color prints

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

when tiny wire pins strike ribbon� Impact printer forms

characters by striking mechanism against inked

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mechanism against inked ribbon that contacts paper


What is a line printer ?� High-speed impact printer

that prints entire lineat a time

� Speed measured in lines per minute (lpm)

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� Band printer prints fullyformed characters using a hammer mechanism

� Shuttle-matrix printer is high-speed printer that works like dot-matrix printer

Speakers, Headphones, and HeadsetsSpeakers, Headphones, and HeadsetsSpeakers, Headphones, and HeadsetsSpeakers, Headphones, and Headsets

What is anaudio output device?� Computer component that produces music, speech, or

other sounds� Speakersand headsets are common devices

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Speakers, Headphones, and HeadsetsSpeakers, Headphones, and HeadsetsSpeakers, Headphones, and HeadsetsSpeakers, Headphones, and Headsets

What is voice output?� Computer talks to you through speakers on computer� Internet telephony allows you to have conversation

over Web

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Other Output DevicesOther Output DevicesOther Output DevicesOther Output Devices

What is a facsimile(fax) machine?� Device that transmits and receives documents over

telephone lines

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What is a fax modem?� Modem that allows you to send and receive electronic

documents as faxesexternal fax modem

internal fax card in system unit

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fax machine


What is a multifunction peripheral ?� Provides functionality

of printer, scanner, copy machine, and fax machine

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What is a data projector?� Device that takes text

and images from computer screen and projects them onto larger screen

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larger screen


What is force feedback?� Sends resistance to device in response to actions of user

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Putting It All TogetherPutting It All TogetherPutting It All TogetherPutting It All Together

What are suggested output devices for the home user?

Monitor Printer Other

� 17- or 19-inch LCD monitor

� Ink-jet color printer; or

� Photo printer

� Speakers� Headset� Force-feedback

User

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� Photo printer � Force-feedback joystick, wheel, and/or gamepad


What are suggested output devices for the small office/home office user?


� Color LCD

� Multifunction peripheral; or

� Ink-jet color

� Fax machine� Speakers

Monitor Printer OtherUser

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� Color LCD screen on Tablet PC, PDA, or smart phone


� Laser printer (black-and-white or color)

� Label printer� Postage printer


What are suggested output devices for the mobile user?

� 17-inch color LCD screen on notebook

� Mobile color printer

� Ink-jet color

� Fax modem� Headphones or

earphones


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notebook computer

� LCD screen on Tablet PC, PDA, or smart phone


� Laser printer for in-office use (black-and-white or color)

� Photo printer

earphones� DLP data

projector


What are suggested output devices for the power user?

� 23-inch LCD monitor

� Laser printer (black-and-white or color)

� Fax machine or fax modem

� Speakers


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white or color)� Plotter or large-

format printer; or

� Photo printer; or� Dye-sublimation

printer

� Speakers� Headphones or

earphones


What are suggested output devices for the large business user?

� High-speed laser printer

� Laser printer,

� Fax machine or fax modem

� Speakers

Monitor Printer Other


� LCD screen on

User

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� Laser printer, color

� Line printer (for large reports from a mainframe)

� Label printer

� Speakers� Headphones or

earphones� DLP data

projector

� LCD screen on Tablet PC, PDA, or smart phone

Output Devices for Physically Challenged UsersOutput Devices for Physically Challenged UsersOutput Devices for Physically Challenged UsersOutput Devices for Physically Challenged Users

What is the Magnifier?� Windows Magnifier

enlarges text and other items on screen

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Output Devices for Physically Challenged UsersOutput Devices for Physically Challenged UsersOutput Devices for Physically Challenged UsersOutput Devices for Physically Challenged Users

What other output options are available for visually impaired users?� Change Window settings,

such as increasing size or changing color of text to make words easier to read

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make words easier to read� Blind users can work with

Windows Vista’s Narrator� Braille printer outputs

information in Braille onto paper

Fax machines and fax modemsFax machines and fax modems

Summary of Summary of Summary of Summary of OutputOutputOutputOutput

Flat-panel displaysFlat-panel displays

CRT monitorsCRT monitors Multifunction peripheralsMultifunction peripherals

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PrintersPrinters

Speakers, headphones, and earphonesSpeakers, headphones, and earphones

Data projectorsData projectors

Force feedback joysticks, wheels, and gamepads

Force feedback joysticks, wheels, and gamepads

Chapter 4 Complete

Technology

CSC1100 - Chapter04 - Output