7 Segment Display – Common Cathode
The 7-segment 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 Cathode (CC)
In the common cathode display, all the cathode connections of the LED segments are joined together to logic “0” or ground. The individual segments are illuminated by application of a “HIGH”, or logic “1” signal via a current limiting resistor to forward bias the individual Anode terminals (a-g).
- Microcontroller 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
Package Includes :
1 x 7 Segment Display – Common Cathode.