Output
Thomas W. Davis
What is Output?
Output it data that has been processed
into a useful form
Output includes:
Monitors
 Printers
 Speakers
 Etc.

Basic Categories
Text
Graphics
Audio
Video
Display Devices
Display device: output device that
visually conveys text, graphics, and
video information

Information is referred to as a soft copy
Consist of a screen and the
components that produce the
information on the screen
Monitor
Plastic or metal case that houses a
display device as a separate peripheral
Most mobile computers and devices
integrate the display and other
components into the same physical
case
Display may be color or monochrome
CRT Monitors
A desktop monitor
that is similar to a
standard television
because it contains
a cathode-tube
A cathode-ray tube
(CRT) is a large,
sealed glass tube
How the Display Works
The screen is made of dots of phosphor
material
Each dot is made of red, green, and blue
 Three dots combine to form a pixel

An electron beam moves back and forth
across the back of the screen causing
the dots to glow, producing an image
Monitor Sizes
You measure monitor size diagonally
from top left corner to bottom right
corner

This is divided into viewable size and
actual size
Determining the size of the monitor to
purchase depends on the intended use
CRT Monitor Ergonomics
Features that include: tilt-and-swivel
base, brightness, contrast, positioning,
height, and width controls
ENERGY STAR program

Encourages manufacturers to create
energy efficient devices that use little
energy when not in use
Quality of a CRT Monitor
Depends on the resolution
Describes the sharpness and clearness of
an image
 Most monitors support a wide range or
resolutions up to 1600 x 1200, with 800 x
600 the normal

Also depends on dot pitch and refresh
rate
Video Cards and CRT
Monitors
Video card: converts
digital output from
the computer into an
analog video signal
and sends the signal
through the cable to
the monitor, which
displays output on
the screen
Color Depth
The number of bits a video card uses to
store information about each pixel

The greater the number of bits the better
the image
Flat-Panel Displays
Flat panel display is
a display with a
shallow depth that
does not use CRT
technology
Includes monitors,
LCD displays, gas
plasma displays and
HDTV
Flat-Panel Monitors
Also called an LCD
monitor, is a desktop
monitor that uses a
liquid crystal display
rather than a
cathode-tube to
produce images
Advantages to a FlatScreen
Take up less desk space, called
footprint
Uses one-third the power of a CRT
monitor
Produces less heat
Does not produce radiation
LCD Technology
Liquid crystal display (LCD) uses a
liquid compound to present information
on a screen
Produce color using either passivematrix or active-matrix technology
LCD quality is measured in the same
manner as CRT display quality is
measured
Gas Plasma Displays
A display that uses gas plasma
technology, which substitutes a layer of
gas for the liquid crystal material in a flat
panel monitor
When voltage is applied, the gas
releases UV light causing pixels on the
screen to glow
Televisions and HDTV
Displays
Digital televisions have two major
advantages
Digital signals produce a higher-quality
picture
 Many programs can be broadcast on a
single digital channel

HDTV: is the most advanced from of
digital television
Printers
A printer is an output
device that
produces text and
graphics on a
physical medium
Produce hard copies
of data
Impact Printers
Impact Printer: form
characters and graphics
by striking a mechanism
against an inked ribbon
that physically contacts
the paper
Types:


DOT-MARTIX Printer
Line Printers
Nonimpact Printers
Nonimpact printers: forms characters and
graphics on a piece of paper without actually
touching the paper
Types:





Ink-Jet
Photo Printers
Laser Printers
Thermal Printers
Portable Printers
Speakers and Headsets
Audio output device: a component of a
computer that produces music, speech
or other sounds
Faxes Machines and Fax
Modems
Fax machine: short for
facsimile machine, is a
device that transmits
and receives
documents over
telephone lines.
Fax modem: allows the
user to send and
receive electronic
documents and faxes.
Multifunction Perpheral
A single device that
looks like a copy
machine but
provides the
functionality of a
printer, scanner,
copy machine, and
a fax machine
Data Projectors
A device that takes
the image from
computer screen
and projects it onto
a larger screen
LCD Projector
Digital Light
Processing
Projector