OUTPUT DEVICE
Monitor
What is it?
• The information we obtain from the computer is called an output
• The computer presenting this information is called the output device
• It is the display screen of a computer• There are several output devices:
– Monitor– Printer– Plotter– Speaker
Monitor
• It is the display screen of a computer• It is commonly used output device• Images on a monitor are made up of
thousands of tiny coloured dots called PIXELS.
• The monitor is also known as Visual Display Unit (VDU)
• The screen is the surface of monitor which display the text and pictures
Types of Monitor
• There are several types of monitor:– Monochrome monitor
• Display text and graphics in white against a black background
– Colour monitor• Display text and graphics in multiple colours
– Cathode Ray Tube (CRT)• A specialized vacuumtube in which images are produced
when an electron beam strikes aphosphorescent surface
– Liquid Crystal Display (LCD)• Displays utilize two sheets of polarizing material with a
liquid crystal solution between them
Cathode Ray Tube (CRT)
• It is the cheapest type of monitor
• It is large and bulky size
• Noisy, heavy and generates a lot of heat
• Quickly becoming outdated
Liquid Crystal Display (LCD)
• More expensive than the CRT monitor
• It is flatter and less bulky, with a higher quality display
• Consumes less electricity and is much lighter
• Become much more popular than CRT monitor
Picture Quality
• The quality of the pictures depends on the SCREEN RESOLUTION– Screen Resolution means the number of pixels
displayed on the screen
• There are two types of screen resolutions:-– High-Resolution
• The monitor screen has more pixels
– Low-Resolution• The monitor screen has fewer pixels
Colour Monitor
• Choices of colour monitor
TYPE RESOLUTION
CGA Colour Graphics Adapter LOW
EGA Enhanced Graphics Adapter MEDIUM
VGA Video Graphics Arrays HIGH
SVGA Super Video Graphics Arrays VERY HIGH
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