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Liquid Crystal Display Monitors: LCD monitor is the
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advanced form of CRT monitors. A cold cathode ray and
the fluorescent panel are two major components of the
LCD. The cold cathode ray technology is used in LCD
which emits electrons and light up the fluorescent coated
monitor screen. The process is known as backlighting.
The second component is a fluorescent panel, which is
made of liquid crystal. Liquid Crystal is current sensitive
and determines the number of electrons that pass through
the screen to make the shape and image of an object.
Light Emitting Diode Monitors: Light Emitting
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Diode (LED) monitor is an improved version of LCD
monitors and manufacturers have tried to eliminate
the drawbacks of LCD monitors. Both the monitors
are based on the same display technology and
provide better resolution. However, the difference
arises on backlighting as LCD monitors use the Cold
Cathode Fluorescent Light and LED monitors use
the light emitting diode.
The backlighting negatively impacts the image quality by decreasing its sharpness and brightness.
WLED and RGB LED are the two types of LED monitors, depending on the way LED is placed in the
panel.
Benefits of LED over CRT and LCD Monitors
LED monitors give a high-quality image with vibrant colours and viewing comfort. LCD monitors are
unable to display a black and white image while LED monitors are capable of producing true black hues.
It consumes less electricity than CRT and LCD monitors because of cold cathode fluorescent lamp that is
embedded in the panel. The absence of mercury makes it eco-friendly, while zero per cent flickering
removes the chances of strain on the eyes.
Speaker
Speaker is an output device that converts the electrical signals into sound
waves that we hear. In speakers, electric current passes through the
magnet that pushes the diaphragm of the speaker back and forth. This
creates pressure and vibration in the air and as a result sound is produced.
Motherboard
Motherboard is the main circuit board of a computer that lies inside the CPU box to which all the hardware
components are connected. It is in the form of a large multilayered printed circuit which contains
connectors (sockets) for attaching additional devices.
Basics of Information Technology 23

