LED displays have two main types: numeric display and alphanumeric display. LED numeric display is called 7 segment led display, too. 7 segment led display is applied widely to electrical appliances. It can be used in instruments and meters. LED numeric displays show Arabic numerals. LED numeric display shows information related to numbers: temperature, time, speed and so on. LED alphanumeric display can show led number and led letter in alphabet and Arabic numerals. LED alphanumeric display is widely used in instruments and meters too. But LED alpha numeric display is used less than led numeric displays.