They have shape of rectangular box similar to that of IC but in large size. These are available from different vendors.

Depending on either the common pin is cathode or anode seven segment displays can be either named as common cathode or common anode display respectively. 2 pins in middle are common pins and these are internally shorted. Out of 10 pins 8 are LED pins and these are left freely. Seven segment display is an electronic circuit consisting of 10 pins. The pin diagram of seven segment display is shown in the above figure. Generally seven segment displays are available in 10 pin package. Later in 1970’s, with the advent of LEDs usage of seven segment displays increased to a large extent. They are used in electric power plants but has gained no much reputation. After that in 1910 seven segment display is invented and is illuminated using incandescent bulbs. Wood invented eight segment displays which displays the digit ‘4’ by using diagonal bar. The seven segment display dates back to century old. Single seven segment or number of segments arranged in an order meets our requirements. These LED’s or LCD are used to display the required numeral or alphabet. Liquid crystal displays (LCD) use the properties of liquid crystal for displaying. LED or light emitting diode is P-N junction diode which emits the energy in the form of light, differing from normal P-N junction diode which emits in the form of heat. The seven segment displays are made up of either LEDs (Light emitting diode) or LCDs (Liquid crystal display). Its wide range of applications is in microwave ovens, calculators, washing machines, radios, digital clocks etc. The binary information can be displayed in the form of decimal using this seven segment display.

Use of LEDs in seven segment displays made it more popular. You can see the Seven Segment Display devices in TV shows counting down to ‘0’. Seven segment display is the most common device used for displaying digits and alphabet.

Driving a Seven Segment Display with Transistorĭriving a Seven Segment Display with Integrated Circuit.

Driving a Seven Segment Display with Resistor.

Internal Structure of Seven Segment Display

Top and Bottom View of Seven Segment Display.

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