Applications of LED

The LED's are of different colours such as red,green,blue,yellow,green,etc.They found a wide applications extensively in almost all display boards.the main application is that it is used in seven segment displays,which are used widely in digital indication applications.There are two types of seven segment display's namely
1.Common anode type,and
2.common cathode type.
In the common anode type,the anodes are sort together and a supply of 5v is given and the cathode terminals are connected to the ground,so that the LED's may glow.
And in the common cathode type,the cathode's are sort together and is given to ground,the anode terminals are provided with the supply.
Mostly seven segment display's are used in traffic signal lighting,digital measuring instruments,etc.
Apart from this the LED's are also used in the back-lighting of LCD monitors.