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Hardcopy

Monitors

Projectors

Soft copy

Printers

Plotters

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VIDEO DISPLAY UNIT

Monitor is available in

two types:-

CRT

LCD

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PRINTER

Produces a hard copy of documents stored in

electronic form.

Uses print media like paper or transparencies.

Printers are of 2 types :

Impact printers

Non-impact printers5

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IMPACT & NON-IMPACTPRINTER

IMPACT

PRINTER

DOT MATRIX

DAISY WHEEL

NON-IMPACT

PRINTER

THERMAL

INKJET PRINTER

LASER PRINTER

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IMPACTPRINTERS

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DOT MATRIX

Head runs back andforth, up and down.

Strike an ink-soaked

cloth ribbon.

Produces output on

paper.

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NONIMPACT

PRINTER

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DAISY WHEEL

Contains raisedcharacter set

Motor position the

character on ribbon

Hammer strikes to

print character.

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THERMAL

Prints by heatingthermal paper.

Coating turns black

where heated

It creates the image.

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INKJET PRINTER

Propel drops of ink onpage.

Most common type.

Low cost. High quality output

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LASER PRINTER

Uses static electricityas temporary glue.

Toner clinges to ve

charged area of drum

Drum rolls over the

paper to give output

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PLOTTER

Used to produce graphs or diagrams.

It is used to give perfectly proportioned, highquality graphic output on large sheets.

Two type of plotters are there :

Flatbed plotter

Drum plotter

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FLATBED PLOTTER

Paper is fixed on flat

surface. Pens are moved to

draw the image.

Can use different

colour pen to draw.

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DRUM PLOTTER

The pen is moved on

single axis. Paper itself moves on

drum.

It gives different axis

or dimension.

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ELECTROSTATIC PLOTTER

Produces a raster image by charging the paper

with a high voltage. This voltage attracts toner which is then melted

into the paper with heat.

This type of plotter is fast, but the quality is

generally considered to be poor.

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PROJECTOR

Takes a video signal.

Project the image onscreen.

Uses a high quality

bright light and lens

system.

Used for conference,

class room training.

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VOICE RESPONSE

Allows a user to talk to computer.

It has an audio response device that make audiooutput.

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VOICE REPRODUCTION

Selection of audio output from pre defined audio

responses. It is then converted into digital data.

It is then again converted into analog form.

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SPEECH SYNTHESIS

Raw text is converted into equivalent witten out

words. Phonetic transcription is assigned to each word

It is then converted into sound or speech

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