That depends on the manufacturer and model you bought.
The dealer you bought it from will be happy to provide that information if you
tell them the model you have.
Also, that information is always printed on a little plate on the back of the TV,
probably somewhere near where the electric cord enters the cabinet.
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Liquid Crystal Display it stands for. It doesnt 'do' anything, except makes our old TV's much flatter (no CRT [tube] which is the big pointy part of the back of a tv) gives harsher colours...not as 'warm' colours.
LCD of 4 and 19 is 76.
The LCD of 20 and 9 is 180.
LCD(12, 20) = 60
LCD(8, 3) = 24.