Output Devices UNIT#4
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UNIT#4
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A computer
monitor
is an output device that displays information in pictorial
form.
Provides visual output.
A
monitor
usually comprises the visual display, circuitry, casing, and power
supply.
Originally, computer
monitors
were used for data processing while television
sets were used for entertainment.
Monitors are of different types with different size, characteristics & reso
lution.
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CRT ( Cathode Ray Tube)
LCD ( Liquid crystal Display)
LED ( Light Emitting Diode)
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A
CRT
(
cathode-ray tube
)
monitor
is an analog display device
that creates a visible image on the screen by directing three electron beams
over millions of phosphor dots to make them light up.
A
CRT monitor
contains millions of tiny red, green, and blue
phosphor dots that glow when struck by an electron beam that travels
across the
screen
to create a visible image.
The anode is positive, so it attracts the electrons pouring off the
cathode.
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A flat panel screen that uses the
liquid crystal display
(
LCD
) technology and connects to
a
computer
.
Laptops have used
LCD
screens almost exclusively, and the
LCD monitor
is the standard
display screen for
desktop computers
.
L
E
D
A
LED
display is a flat panel display that uses an array of light-emitting diodes
as pixels for a video display.
Their brightness allows them to be used outdoors where they
are
visible in the
sun for store signs and billboards.
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The
graphics adapter
is an extension card that is used in a
computer to enable the user to view
graphical
information
that has been sent from the computer to a display device
such as a monitor.
Graphics
cards are found in 2 formats in computers.
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Resolution defines number of vertical & horizontal pixels on the screen.
The pixels are the smallest component of a digital image & are combined to form
a comprehensive picture.
More pixels make better pixel quality.
Monitor resolution is measured in
width X height
like 640X480 resolution.
It means the width of the screen is 640 while height of the screen is 480
P
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A
printer
is an output device that prints paper documents.
This includes text documents, images, or a combination of both.
The two most common types of
printers
are inkjet and laser
printers
.
In order to print a document, the electronic data must be sent from the computer
to the
printer
.
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Dot Matrix Printer
Ink Jet printer
Drum printer
Chain/Band printer
Laser printer
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A
multimedia projector
is a
compact,
high resolution,
full-color
projector
capable of projecting text, images, video and audio
content.
Typically the
projector
will feature inputs for a computer, DVD
player, VCR, CD player and storage device.
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There are two types of multimedia projector
LCD projector
DLP projector
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Voice Reproduction System
Speech Synthesizer
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A
voice
response
system
that produces audio output by
selecting appropriate audio output from a set of pre-recorded
audio responses.
Voice
response
system
: An output device that enables a
compute to talk to its users.
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UNIT#5
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Software
is a set of instructions, data or programs used to operate computers and
execute specific tasks.
Examples
of applications include
office suites,
database programs,
web browsers,
word processors,
software
development tools,
image editors and
communication platforms.
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Software
is a program that
enables a
computer
to perform a
specific task, as opposed to the
physical components
of
the
system (hardware).
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For software, hardware is important, but what really makes
your computer work is the
software
.
Software
applications or programs manage the hardware.
This is called the source program.
The source program is compiled or translated into a
machine-language that the computer hardware, specifically
the CPU, can execute.
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T
hree types of software
S
ystem software,
A
pplication software,
P
rogramming language
software.
Each type of software has its function and runs on the
computer
system
.
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System software
is a type of computer program that is designed to run a
computer's hardware and application programs.
If we think of the computer
system
as a layered model, the
system software
is
the interface between the hardware and user applications.
System software
is
software
designed to provide a platform for other
software
.
Examples of
system software
include
operating
systems
like macOS, GNU/Linux , Android and Microsoft Windows, computational
science
software
, game engines, industrial automation, and
software
as a service applications.
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S
ystem Software
is a set of
programs
that control and manage the
operations of computer hardware.
It also helps application
programs
to execute correctly.
System Software
are designed to control the operation and extend
the processing functionalities of a computer
system
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Operating system
Utility programs
Device drivers
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An
Operating System
(OS) is an interface between a computer user
and computer hardware.
An
operating system
is a
software
which performs all the basic
tasks like
file management,
memory management,
process management,
handling input and output,
and controlling peripheral devices such as disk drives and printers.
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Utility
software helps to manage, maintain and control computer
resources.
Examples
of
utility programs
are antivirus software, backup
software and disk tools.
Computer systems use a special type of firmware known as BIOS, or
Basic Input/Output System.
This represents the basic code to get the computer started.
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Different types and examples of utility programs are as follows:
•
File Viewer.
•
File Compressor.
•
Diagnostic
Utilities
.
•
Disk Scanner.
•
Antivirus.
•
Disk Defragmenter.
•
Backup
Utility
.
•
Data Recovery
Utility
.
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W
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X
P
1.
Choose Start→Control Panel. ...
2.
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.
How to Uninstall Software in Windows XP
1.
O
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3.
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4.
Heed the directions on the screen.
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According to IBM Research:
“
Software development
refers to a set of computer science
activities dedicated to the process of creating, designing,
deploying and supporting
software
.” ...
Programming
software
to give programmers tools such as
text editors, compilers, linkers, debuggers and other tools to
create code.
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D
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Software
is
developed
using computer programming, carried
out by a
software
developer.
They use processes and techniques to create working
software
,
including requirements definition,
data flow design, code design,
process flow design,
flowcharting,
code creation,
software development
testing,
and debugging.
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Software
distribution
can refer to 2 distinct concepts.
When used as a verb, software distribution is the process
of
delivering software to the end user, while a software distribution, as a
noun, (distro) is a collection of software.
The
Software Distribution folder
is a
folder
that is used to store
temporary files, which the files are usually from Windows Updates.
It's useful to delete the contents of the
folder
when Windows
Updates is not working properly.
Output devices in computing play a crucial role in displaying visual information to users. Monitors, including CRT, LCD, and LED types, provide visual output by showing pictorial forms on screens. Each type has distinct characteristics and resolutions. Graphics adapters help computers render graphical information for user viewing.
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Presentation Transcript
Output Devices Output Devices UNIT#4
Monitor Monitor A computer monitor is an output device that displays information in pictorial form. Provides visual output. A monitor usually comprises the visual display, circuitry, casing, and power supply. Originally, computer monitors were used for data processing while television sets were used for entertainment. Monitors are of different types with different size, characteristics & resolution.
Types of Monitors Types of Monitors CRT ( Cathode Ray Tube) LCD ( Liquid crystal Display) LED ( Light Emitting Diode)
CRT Monitor CRT Monitor ACRT (cathode-ray tube) monitor is an analog display device that creates a visible image on the screen by directing three electron beams over millions of phosphor dots to make them light up. A CRT monitor contains millions of tiny red, green, and blue phosphor dots that glow when struck by an electron beam that travels across the screen to create a visible image. The anode is positive, so it attracts the electrons pouring off the cathode.
CRT Monitor CRT Monitor
LCD LCD A flat panel screen that uses the liquid crystal display (LCD) technology and connects to a computer. Laptops have used LCD screens almost exclusively, and the LCD monitor is the standard display screen for desktop computers.
LED LED ALED display is a flat panel display that uses an array of light-emitting diodes as pixels for a video display. Their brightness allows them to be used outdoors where they are visible in the sun for store signs and billboards.
Graphics Adapter Graphics Adapter The graphics adapter is an extension card that is used in a computer to enable the user to view graphical information that has been sent from the computer to a display device such as a monitor. Graphics cards are found in 2 formats in computers.
Graphics Adapter Graphics Adapter
Size Size
Resolution Resolution Resolution defines number of vertical & horizontal pixels on the screen. The pixels are the smallest component of a digital image & are combined to form a comprehensive picture. More pixels make better pixel quality. Monitor resolution is measured in width X height like 640X480 resolution. It means the width of the screen is 640 while height of the screen is 480
Monitor size Recommended resolution (in pixels) 19-inch standard ratio LCD monitor 1280 1024 20-inch standard ratio LCD monitor 1600 1200 20- and 22-inch widescreen LCD monitors 1680 1050 24-inch widescreen LCD monitor 1920 1200
Printer Printer Aprinter is an output device that prints paper documents. This includes text documents, images, or a combination of both. The two most common types of printers are inkjet and laser printers. In order to print a document, the electronic data must be sent from the computer to the printer.
Types of printer Types of printer Dot Matrix Printer Ink Jet printer Drum printer Chain/Band printer Laser printer
Dot Matrix Printer Dot Matrix Printer
Characteristics & Limitations of Dot Matrix Characteristics & Limitations of Dot Matrix
Inkjet Printer Inkjet Printer
Characteristics & Limitations of Characteristics & Limitations of InkJet InkJet
Drum Printer Drum Printer
Characteristics & Limitations of Drum Characteristics & Limitations of Drum Printer Printer
Chain or Band Printer Chain or Band Printer
Characteristics & Limitations of Characteristics & Limitations of chain/Band chain/Band
Laser Printer Laser Printer
Characteristics & Limitations of Laser Characteristics & Limitations of Laser
Plotter Plotter
Special terminal functions Special terminal functions
ATM Characteristics ATM Characteristics
POS Terminal POS Terminal
POS Terminal POS Terminal
Multimedia Projector Multimedia Projector Amultimedia projector is a compact, high resolution, full-color projector capable of projecting text, images, video and audio content. Typically the projector will feature inputs for a computer, DVD player, VCR, CD player and storage device.
Types of multimedia projector Types of multimedia projector There are two types of multimedia projector LCD projector DLP projector
LCD projector LCD projector
DLP Projector DLP Projector
Voice Response System Voice Response System
