In general, common anode displays are more popular as many logic circuits can sink more current than they can source. The individual segments are illuminated by application of a вЂњHIGHвЂќ, or logic вЂњ1вЂќ signal via a current limiting resistor to forward bias the individual Anode terminals (a-g). The Common Cathode (CC)В вЂ“В In the common cathode display, all the cathode connections of the LED segments are joined together to logic вЂњ0вЂќ or ground. The difference between the two displays, as their name suggests, is that the common cathode has all the cathodes of the 7-segments connected directly together and the common anode has all the anodes of the 7-segments connected together and is illuminated as follows.ДЎ. As each LED has two connecting pins, one called the вЂњAnodeвЂќ and the other called the вЂњCathodeвЂќ, there are therefore two types of LED 7-segment display called: Common Cathode (CC) and Common Anode (CA). The displays common pin is generally used to identify which type of 7-segment display it is. This then allows us to display each of the ten decimal digits 0 through to 9 on the same 7-segment display. So by forward biasing the appropriate pins of the LED segments in a particular order, some segments will be light and others will be dark allowing the desired character pattern of the number to be generated on the display. The other LED pins are connected together and wired to form a common pin. These individually LED pins are labelled from a through to g representing each individual LED. Each of the seven LEDs is called a segment because when illuminated the segment forms part of a numerical digit (both Decimal and Hex) to be displayed.ДЄn additional 8th LED is sometimes used within the same package thus allowing the indication of a decimal point, (DP) when two or more 7-segment displays are connected together to display numbers greater than ten.Д®ach one of the seven LEDs in the display is given a positional segment with one of its connection pins being brought straight out of the rectangular plastic package. The 7-segment display, also written as вЂњseven segment displayвЂќ, consists of seven LEDs (hence its name) arranged in a rectangular fashion as shown. Light emitting diodes have many advantages over traditional bulbs and lamps, with the main ones being their small size, long life, various colours, cheapness and are readily available, as well as being easy to interface with various other electronic components and digital circuits.Д«ut the main advantage of light emitting diodes is that because of their small die size, several of them can be connected together within one small and compact package producing what is generally called a 7-segment Display.

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