Page 46 - gyamfi series vol. 2

INFORMATION AND COMUNICATION TECHNOLOGY GYAMFI SERIES
3. They change human readable language into machine readable form.

OUTPUT DEVICES

An output is the process through which
information is brought to the user. The
information
displayed on the monitor is termed as SOFT
COPY because it cannot be touched. The
information printed on paper is termed as
HARD COPY because it can be felt and touched.
An Output Device is any hardware device that the computer uses to communicate to the user.

TYPES OF OUTPUT DEVICES
1. MONITOR
2. SPEAKER
3. HEAD PHONE
4. DIGITAL WATCH
5. PROJECTER
6. PLOTTER
MONITOR
A monitor is the device like a TV that lets you see information on your computer. It is
sometimes called (VDU). VDU means Visual Display Unit or Visual Display Terminal (VDT) or
Display screen Equipment (DSE)
Types of monitor
There are 2 main types of monitors;
1. Cathode Ray Tube (CRT) monitor: is a type of monitor that looks like the old type TVs
which is very heavy with a long back. The screen of the monitor is measured in inches
across the diagonal of the screen.
2. Flat Screen or LCD (Liquid Crystallized Display) monitor. This monitor is very flat unlike
the CRT. It is the current type of monitor most people are using. Note book or Laptop
computers use this type of monitor.
DIFFERENCES BETWEEN CRT AND LCD
CATHODE RAY TUBE(CRT) LIQUID CRYSTAL DISPLAY(LCD)
It uses a large vacuum tube called cathode ray It creates images with special kind of liquid
tube crystals that is normally transparent but when
charged with electricity becomes opaque.
It can be viewed in long distance It can be viewed in short distance.
It can stand electric outages It screen can easy break down by electric
outages.
SPEAKER; A Speaker is used to outputs sound from the computer. It helps us hear the sound
when we play music or watch movies on our computer. Some computers come with in-built
speakers whiles others are not. Most laptops come with in-built speakers.

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