Lcd vs led

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assalam alaikum
ye lcd aur led mein kya farq diffrence hota hai??aur pixel kya hotay hain??

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liquid crystal display (LCD) is a flat panel display, electronic visual display, video display that uses the light modulating properties of liquid crystals (LCs). LCs do not emit light directly. They are used in a wide range of applications, including computer monitors, television, instrument panels, aircraft cockpit displays, signage, etc. They are common in consumer devices such as video players, gaming devices, clocks, watches, calculators, and telephones. LCDs have replaced cathode ray tube (CRT) displays in most applications. They are available in a wider range of screen sizes than CRT and plasma displays, and since they do not use phosphors, they cannot suffer image burn-in.
LCDs are more energy efficient and offer safer disposal than CRTs. Its low electrical power consumption enables it to be used in battery-powered electronic equipment. It is an electronically modulated optical device made up of any number of segments filled with liquid crystals and arrayed in front of a light source (backlight) or reflector to produce images in color or monochrome. The most flexible ones use an array of small pixels. The earliest discovery leading to the development of LCD technology, the discovery of liquid crystals, dates from 1888.[1] By 2008, worldwide sales of televisions with LCD screens had surpassed the sale of CRT units.




LED-backlight LCD television is an LCD television, flat panel display that uses LED backlighting instead of the cold cathode (CCFL) backlighting used in other LCD televisions. While not an LED display, it is called "LED TV" by some manufacturers and suppliers[1]. The use of LED backlighting allows a thinner panel, lower power consumption, better heat dissipation, a brighter display, and better contrast levels.[1]
Three forms of LED may be used:

• White edge-LEDs around the rim of the screen, using a special diffusion panel to spread the light evenly behind the screen (the most usual form)
• Dynamic RGB LEDs behind the panel
• A full array of LEDs arranged behind the screen whose brightness cannot be controlled individually