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Lecture # 3

11/21/2012 Designed by Prof. Anosha Khan 1

 Output is data that has been processed into a useful
form
 Hardcopy : Hardcopy refers to printed output
 Softcopy : Softcopy refers to data that is shown on a
display screen or is in audio or voice form.


 An output device is any type of hardware
component that conveys information to one
or more people
 Display Devices
 Printers
 Speakers
 Data projectors

 Chapter # 3 , page # 93

 Most commonly used output device
 Categories of Monitors
 Monochrome monitors
 Grayscale monitors
 Color monitors
 See page # 94


CRT monitor (Page # 95)
A CRT, for cathode-ray tube, is a vacuum
tube used as a display screen in a computer or
video display terminal. Images are represented
on the screen by individual dots or “picture
elements” called pixels. A pixel is the smallest
unit on the screen can be turned on and off or
made different shades.
See Page # 95

Flat-panel display - made up of two plates of glass
separated by a layer of a substance in which light is
manipulated

Categories of LCD
Active-matrix - each pixel on the screen is
controlled by its own transistor
TFT- Thin film transistor
Passive-matrix - a transistor controls a whole row or
column of pixels


 Paper-white displays
 Creates higher contrast , Used by desktop publishing
specialists, newspaper or magazine compositor and
other persons who creates high quality printed
documents
 Electroluminescent Displays(ELDs)
 Uses phosphorescent film held between two sheets
of glass. A grid of wires sends current through the film
to create an image
 Plasma Display
These are display devices that use gas plasma technology


 Size
 The Larger the size the bigger the image
 Measured diagonally
 Resolution
 Sharpness and clarity of image
 Number of pixels on the screen
 640X480 means 640 pixels horizontally and 480
pixels vertically
 Video graphics array

 Refresh Rate
 Number of times per second that the electron
gun scans pixels on screen
 Measured in Hertz
 Dot Pitch
 The distance between the liked colored phosphor
dots of adjacent pixels
 Measured as a fraction of a millimeter(mm)


 A printer produces text and graphics on a
physical medium
 Printed information is called a hard copy, or
printout
 Landscape or portrait orientation
 Impact printers
 Non impact 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
▪ Band Printers


 A nonimpact printer forms characters and
graphics on a piece of paper without actually
striking the paper
 Laser Printer
 Ink-Jet Printer
 Thermal Printer


 It is used to print large format images
 Used for architectural, engineering drawings
and construction maps
 Drum Plotter
 Flatbed Plotter


 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
 Headphones are speakers that cover your head
or are placed outside of the ear
 Earbuds (also called earphones) rest inside the
ear canal

 A data projector is a
device that takes the
text and images
displaying on a
computer screen and
projects them on a
larger screen
 Digital light processing
(DLP) projector

 An interactive
whiteboard is a touch-
sensitive device,
resembling a dry-erase
board, that displays
the image on a
connected computer
screen
 Home Task all-in-one
peripherals, photo
printer, Dye-
sublimation Printers

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Output devices

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