Page 25 - CA 165 ver 1.0 Class 9
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Liquid Crystal Display Monitors: LCD monitor  is the
                 l
                      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
                                                               l
                                                                    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
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