Description

7 Segment LED Display – Common Anode

The 7 segment LED display consists of seven LEDs arranged in a rectangular fashion. 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. An additional 8th LED is sometimes used within the same package thus allowing the indication of a decimal point, (DP). An LED or Light Emitting Diode is a solid-state optical PN-junction diode that emits light energy in the form of photons. (Find a wide range of  LED/LCD display boards  at solicstores.in)

The emission of these photons occurs when the diode junction is forward biased by an external voltage allowing current to flow across its junction, and in Electronics we call this process electroluminescence. 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.

The Common Anode (CA)

In the common anode display, all the anode connections of the LED segments are joined together to logic “1”. The individual segments are illuminated by applying a ground, logic “0” or “LOW” signal via a suitable current limiting resistor to the Cathode of the particular segment (a-g).

Applications

• Used in applications where font size is required to be bigger
• Micro controller Independent, hence used in small circuit projects
• Used in combination with four segments to display measurement/sensor value  with four characters
• Has bright illumination, hence used where the display is required to work in low light or dark conditions

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