Output devices lecture 6

OUTPUT UNITS
TOPIC TO BE PRESENTED

OUT PUT UNIT
 The final part of a computer is the output unit.
Which presents the result machine operations in
printed or other visual form , or an tapes and
disks.
 It is a device which receives results from CPU.
 It is used to transfer information out of the
computing system.

TYPES OF OUTPUT
The output can be of two types ;
HARD COPY
SOFT COPY

HARD COPY
An output is said to be in its hardcopy from
when it is contained on some hard surface
like paper, glass and plastic.
In this form an output can be seen as well
as touched.

SOFT COPY
 Another form of output that can be seen but
cannot be touched is its soft copy.
 In this form of output exists till the computer is on
if the computer is switched off then the softcopy
of output disappears.
 Softcopies of output are generated through
computer monitors, speakers and other output
devices.

PRINTER
 It is an output device that character on paper and
provides a permanent visual record of data .
 The result we get through printer is called print out
or hard copy .
 Printer is invented by Chester Carlson in 1938.

IMPACT CHARACTER PRINTER
Prints on character at a time at speed ten
to five hundreds character per second an
thus, form the slowest class of printer.

IMPACT LINE PRINTER
Impact line printer is capable of
printing whole line at a time.
They can be categorized as
wheel printers, drum printers,
band printers, or chain printers.

WHEEL PRINTER
 It can print up to 150 lines per minute.
 It has a separate print wheel for each position in
the line.
 Appropriate characters are adjusted by rotating
the wheel and then a hammer presses the ribbon,
paper and wheel to print those characters on the
paper.

DRUM PRINTER
It can prints 3000 lines per minute.
The characters are embossed on its
surface.
These characters are printed on the
paper when hammer strikes on the
paper and the rotating drum .
When an appropriate character comes
into position.

BAND PRINTER
 It has a steel band divided into five sections of
forty eight characters each.
 The printed output produced when the band
moves and appropriate characters comes into
position, is stuck out by its own hammer against
the band , paper and the ribbon .
 It prints 3000 lines per minute.

CHAIN PRINTER
If works same as the band printer but
it has a linked chain composed of
character instead of a band .
It can print at the speed of up to 3000
lines per minute.

DOT MATRIX PRINTER
An arrangement of tiny hammers strikes to
produce the desired characters.
Each hammer prints a small dot on the
paper and hence the letters is produced
and thus it is called dot matrix printer.

INK JET PRINTER
Ink jet printer spraying electrically charged
particles , from selected nozzles to form an
image on paper.
There are quiet and fast but more
expensive than dot matrix printer.

PLOTTERS
 A plotters generated hardcopies of drawing such as lines
,engineering maps, machines, building design, graphs etc in
very accurate manner.
 Plotters may use colors or specific inks for their drawings.
 A plotter is composed of a hard metallic strip on which
mechanical hand moves towards left and right.

SPEAKERS
Speakers generates sound .
Out put of the speaker may be speech of
the person as well as some other sounds
like music.

PROJECTORS
Projectors are often used in meetings and
presentations to help an make sure every
thing.
It can display of a computer screen and
projects a large version of it onto a flat
surface.

MONITORS
It display / shows pictures .
It shows output.
It looks like television but it has a
differences like monitors don’t have tuner
to change channels.

LIQUID CRYSTAL DISPLAY
LCD are super thin display that are used in
laptops ,computer screens and flat panel
monitors.
The image of LCD screen is created by
sandwiching electrically reactive substance
between two electrodes.

Output devices lecture 6

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Output devices lecture 6