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 Page | 1 Lecturer Note 2012 _ Aidahani Ahmad  B A ASIC HA AR RDW WA ARE III:  OUT TPU T T DE V VIC CES TYPES OF OUTPUT DEVICES i. DISPLAY DEVICES MONITOR SCREEN Devices that used to display information from the computer.  FEATURES THAT COMPARED MONITORS  Size – A monitor size is the diagonal measurement of its f ace in inches.  Resolution – Resolution is the number of pixels on the screen expressed as a matrix such as 600 x 800.  Refresh Rate – Refresh rate is the number of time each second that the electron guns scan the screen’s pixels and measured in Hz.  Dot Pitch – dot pitch is the distance between the phosphor dots that make up single pixels. TYPES OF MONITOR SCREEN Cathode Ray Tube (CRT) Monitor Disadvantages  They have a big back and take up space on desk.  CRTs emit an electromagnetic fields and a small amount of X-ray band radiation which can result in a health hazard.  Easily overheated because it operates at very high voltage.  They are heavy to p ick up and carry around Advantages :  Cheaper than LCD  Produce more and high colour accuracy compared to plasma and LCD.  Fast respond time and no motion artifact Definition of OUTPUT DEVICES The devices that send out information from processing system to the outside word or user in a variety of means such as hardcopy o r softcopy.

Chap 4 _ Output Devices

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P a g e | 1  Lecturer Note 2012 _ Aidahani Ahmad  

BBAASSIICC HHAARRDDWWAARREE IIIIII:: OOUUTTPPUUTT DDEEVVIICCEESS 

TYPES OF OUTPUT DEVICES

i.  DISPLAY DEVICES

MONITOR SCREEN

Devices that used to display information from the computer. 

FEATURES THAT COMPARED MONITORS

•  Size – A monitor size is the diagonal measurement of its face in inches.

•  Resolution – Resolution is the number of pixels on the screen expressed as a

matrix such as 600 x 800.

• 

Refresh Rate – Refresh rate is the number of time each second that the electronguns scan the screen’s pixels and measured in Hz.

•  Dot Pitch – dot pitch is the distance between the phosphor dots that make up

single pixels.

TYPES OF MONITOR SCREEN

Cathode Ray

Tube (CRT)

Monitor

Disadvantages

⟩  They have a big back and take up space on desk.

⟩  CRTs emit an electromagnetic fields and a small amount of X-ray

band radiation which can result in a health hazard.

⟩  Easily overheated because it operates at very high voltage.

⟩  They are heavy to pick up and carry around

Advantages :

⟩  Cheaper than LCD

⟩  Produce more and high colour accuracy compared to plasma and

LCD.

⟩  Fast respond time and no motion artifact

Definition of 

OUTPUT

DEVICES

The devices that send out information from

processing system to the outside word or user ina variety of means such as hardcopy or softcopy.

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Plasma Monitor Disadvantages

⟩  Has a very short life span, estimate the life span to be around

20,000 hours to 30,000 hours.

⟩  More expensive than CRT monitors.

⟩  Fragile and easily broken.

Advantages

⟩  Larger viewing angle and free standing.

⟩  Thinner in width than the CRT monitor.

⟩  The plasma display units has a clearer image, brighter viewing

angle, better colour quality and higher contrast ratio than the

CRT and LCD display units.

Liquid Crystal

Displays (LCD)

monitors

Disadvantages

⟩  The cost of a LCD is considerably at a high price.

⟩  The LCD display will have slow response times.⟩  The LCD display has a fixed resolution display and cannot be

changed. LCDs use analog interface making careful adjustment

of pixel tracking/phase in order to reduce or eliminate digital

noise in the image.

⟩  The viewing angle of a LCD display is very limited due to the

Automatic pixel tracking/phase controls.

Advantages :

⟩  Absence of electro magnetic waves

⟩  Lower heat emission⟩  Power Savings

⟩  Less space and screens are perfectly flat.

⟩  Lack of flicker and low glare reduce eyestrain.

ii.  PRINTERS - a peripheral which produces a hard copy as output 

Non-Impact Printer 

•  Printing without 

striking the paper.

•  Expensive 

•  Less noisy  

•  High quality 

 printing 

Ink Jet

Printer

Spray tiny drops of liquid ink from jet nozzles onto

paper that produce high resolution output andenergy efficient printers but slow when printing

graphic.

Laser Printer Use laser beam to produce an image on drum

before printing. Produce high-speed and high

quality images but in higher cost.

Thermal

Printer

Pushing electrical heated pins against heat-

sensitive / thermal paper to produce inexpensive

purchase receipt that has low quality and tend tofade over time.

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Mobile

Printer

Use ink-jet or thermal technology for printing.

The printer will be small, lightweight and battery

powered that easily carried / mobile.

Plotters Large scale printer which is very accurate in

producing engineering drawings andarchitectural blue prints. Its produce photo-

realistic-quality colour prints.

Impact Printer 

•  Printing by striking

or physically 

contacts the paper 

•  The cheapest 

•  The most noisy 

 printer 

•  Has a low print 

quality.

Dot Matrix

Printer

Producing images and text by placing the dot

when print head strike an inked ribbon onto a

continuous-form paper.

Daisy Wheel

Printer

This printer consist of a wheel and attached

extensions on which molded metal characters

are mounted, its will produce letter quality printbut cannot produce graphics output.

Line Printer Producing image and text by placing the dot

entire line at a time when print head strike an

inked ribbon onto a continuous-form paper.

iii.  SOUND OUTPUT DEVICES

SPEAKER To output sound raging from beeps and chirps to music when attached to the

sound card of the computer.

VOICE OUTPUT

DEVICES

Device that used to convert digital data into speech-like sound.

Two types of voice output device:

i.  Speech coding uses actual human voice speaking words to provide a

digital database of words that can be output as voice sounds.

ii.  Speech synthesis uses a set of 40 basic speech sounds called

phonemes, the bases of all speech in English to electronically create

any words.

iii.  PROJECTOR –  A device that reproduces images or video frames on white screen. 

VIDEO

PROJECTOR

Output a corresponding picture frame on a projection screen using a lens

system, commonly used in conference and class room.

LCD PROJECTOR Used liquid crystal display technology to produce expressive colour image and

enlarged display will not changing the size the projected image.

HAND-HELD

PROJECTOR

Miniature size of projector can be use where ever and when ever desired.