Output Devices UoS Fsd

Introduction To ICT

M.Sc. Semester 1st

Course Instructor: Mr. Waseeq Ul Islam

Assignment: Output Devices

M.Sc I.T 1st UoS Lyallpur Campus Faisalabad

Group Members:

Arbab Raza Hasan Nawaz

Humaira Nazir Inam Ul Haq

University of Sargodha,

Lyallpur Campus, Faisalabad

M.Sc I.T 1st UoS Lyallpur Campus Faisalabad 3

Objective Overview

Describe the types of output

Explain the characteristics of various display

devices

Describe various ways to print

Differentiate between a

nonimpact printer and an impact

printer


What Is Output? Output is data that has been processed

into a useful form


6


Output Devices

Output Devices are all part of the Hardware of a computer system

Output Devices are about seeing the results of your work!


Output Devices


Display devices

Printers

Speakers, headphones, and earb uds

Data projectors

9

Some Output Devices

Video Monitor

Sound

Paper


Display Devices

• The graphics processing unit (GPU) controls

the manipulation and display of graphics on a

display device

• LCD monitors use a

digital signal and

should plug into a

DVI port, and HDMI

port, or Display Port


11

Types of Output

• Soft Copy

• Hard Copy

• Communications Channel


Screen Output – Soft Copy

• Video Monitor

• Also called Video Display

Terminal (VDT)

• Image exists in video

memory—VRAM

• Monitor size is measured

diagonally across the screen

12 M.Sc I.T 1st UoS Lyallpur Campus Faisalabad


Pixels • Images are made up of dots

called pixels for picture elements

• The number of pixels determines

clarity of the picture on the screen

• More pixels = higher resolution =

clearer picture

13

14

Pixels



Color Depth (Bit Depth) • This means the amount of information stored

in each pixel about what is being shown on the monitor

• Monochrome (1 bit of information per pixel)

• This can only be black or white

• Gray-scale (8 bits of information per pixel)

• This can show more shades of grey

• True color (24 or 32 bits of information per pixel)

• This can realistically reproduce a photograph on the screen that looks very close to the original

15

Examples of Color Depth

1-bit depth 4-bit depth

8-bit depth 16-bit depth

The greater the color depth the more colours that can be represented on the screen


CRT (cathode ray tube)

LCD (liquid crystal display)

Classes of Monitors


CRT (Cathode Ray Tube)

• A CRT is a television-style monitor

• Its features include:

• Clear image

• Quick response time

• Low cost

• Very popular


Monitor Specifications

• Screen size – The diagonal

measurement in inches (15, 17, 19, 21)

• Resolution – The sharpness of image

determined by the number of dots

(pixels) that the screen can display

(800 x 600, 1024 x 768, 1600 x 1200)

• Refresh rate – The speed at which the screen is

refreshed and measured in Hertz (Hz) (60Hz, 75Hz)


Features of CRT Displays

• Display text and graphics

• Monitors differ in resolution

• Standards

• SVGA – 1024 x 768, 1208 x 1024 and 1600 x 1200

• XGA – has same resolutions but supports more colours

• Screen sizes vary from 15” to 21”


LCD (Liquid Crystal Display)

• LCDs comprise flat-panel monitors

• Found on watches, calculators, digital cameras and

notebook computers

• Lighter weight

• Crisp,clear images

• Extra viewing area for same size

• More expensive to buy

• Consume less power


Paper Output – Hard Copy

• A printer is a device that produces output on paper

• Most printers today can produce both text and graphics

• Two types of printers:

• Impact printers

• Non-impact printers


Impact Printers

• There is some physical contact with the

paper to produce the image ie physically

striking the paper

• Types

• Line printers

• Dot matrix printers


Line Printer • Line printers

• Used by mainframes for jobs that need a large volume of printing

• Limited characters available

• Print an entire line at a time

• Cheap to run

• Not high quality


Dot Matrix Printer • Have a print head made up of columns

of pins

• The pins form characters and images as patterns of dots produced when the pins strike the paper

• Reasonable quality text and graphics

• Inexpensive to buy and run

• Noisy


• A nonimpact printer forms characters and graphics

on a piece of paper without actually striking the paper

Ink-jet printers

Photo printers

Laser printers

Thermal printers

Mobile printers

Label and postage printers

Plotters

Non-Impact Printers


Ink-Jet Printers • Ink-jet

• Dots of ink are sprayed onto the paper to form the image

• Reasonably high quality

• Available in color or B/W

• Reasonably priced

• Expensive to run

• Speed measured in pages per minute


Photo Printers

A photo printer produces color photo-lab-quality pictures

• Most use ink-jet technology

• PictBridge allows you to print photos directly from a digital camera

• Print from a memory card and preview photos on a built-in LCD screen


Laser Printers • Laser printers

• Image transferred to paper with a

laser beam

• Faster and more expensive

than dot-matrix

• High-resolution output

• Expensive to buy

• Quite expensive to run


Thermal Printers

Thermal wax-transfer printer

Dye-sublimation printer

• A thermal printer generates images by pushing

electrically heated pins against the heat-sensitive paper


Mobile Printer

• A mobile printer is a

small, lightweight,

battery-powered printer

that allows a mobile

user to print from a

notebook computer,

smart phone, or other

mobile device


Label Printer

• A label printer is a small

printer that prints on

adhesive-type material

• A postage printer prints postage stamps

• Postage also can be printed on other types of printers


Plotters • Used by graphic designers/architects

• Image transferred to paper with ink pens

• Very high resolution

• Excellent for scientific and engineering applications


Printing Terms

• Dots per inch (dpi)

• Pages per minute (ppm)

• Characters per second (cps)

• Laser printers – 50 ppm

• Ink-jet printers – 12 ppm


Output You Can Hear

• Synthesizers can be

used to generate

music and sounds

• Many computers

have synthesizers

• Sound cards have

built-in synthesizers



Speakers, Headphones,

and Ear buds • 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


and Ear buds • Headphones are

speakers that cover or

are placed outside of the

ear

• Ear buds (also called

earphones) rest inside

the ear canal

Discovering Computers 2011: Living in a Digital

World Chapter 6



and Ear buds • Some speakers are specifically designed to

play audio from a portable media player

• Wireless speakers



and Ear buds

Voice output occurs when you hear a person’s voice or when the computer talks to you through the speakers

• Some Web sites dedicate themselves to providing voice output

• Often works with voice input

• VoIP uses voice output and voice input


Other Output Devices

• A data projector is a

device that takes the text

and images displaying

on a computer screen

and projects them on a

larger screen

• LCD projector

• Digital light processing

(DLP) projector



Thank You

Output Devices UoS Fsd

Education