7 SEGMENT DISPLAY

7 Segment Display

A seven-segment display, or seven-segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot-matrix displays. Seven-segment displays are widely used in digital clocks, electronic meters, and other electronic devices for displaying numerical information.

7 Segment Display - Visual Structure

A seven segment display, as its name indicates, is composed of seven elements. Individually on or off, they can be combined to produce simplified representations of the alphanumeric characters.

7 Segment Display - Visual Structure

The segments of a 7-segment display are referred to by the letters A to G, as shown to the right, where the optional DP decimal point (an "eighth segment") is used for the display of non-integer numbers.

7 Segment Display - Internal Structure

Seven-segment displays contains the arrangement of the LEDs in “Eight” (8) passion, and a Dot (.) with a common electrode, lead (Anode or Cathode).

LED’s are basically of two types:

1. Common Cathode (CC) All the 8 anode legs uses only one cathode, which is common.

2. Common Anode (CA) The common leg for all the cathode is of Anode type

7 Segment Display - ImplementationInterfacing 7 segment Display using 7447

decoderThe IC7447 takes the Binary Coded

Decimal (BCD) as the input and outputs the relevant 7 segment code. The 7447 converts the four input bits (BCD) to their corresponding 7-segment codes. The outputs of the 7447 are connected to the 7-segment display.

7 Segment Display - Implementation

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