Display Decoder

A Digital Decoder IC, is a device which converts one digital format into another and one of the most commonly used devices for doing this is called the Binary Coded Decimal (BCD) to 7-Segment Display Decoder.

7-segment LED (Light Emitting Diode) or LCD (Liquid Crystal Display) type displays, provide a very convenient way of displaying information or digital data in the form of numbers, letters or even alpha-numerical characters.

Typically 7-segment displays consist of seven individual coloured LED’s (called the segments), within one single display package. In order to produce the required numbers or HEX characters from 0 to 9 and A to F respectively, on the display the correct combination of LED segments need to be illuminated and BCD to 7-segment Display Decoders such as the 74LS47 do just that.

A standard 7-segment LED display generally has 8 input connections, one for each LED segment and one that acts as a common terminal or connection for all the internal display segments. Some single displays have also have an additional input pin to display a decimal point in their lower right or left hand corner.

In electronics there are two important types of 7-segment LED digital display.

  • 1. The Common Cathode Display (CCD) – In the common cathode display, all the cathode connections of the LED’s are joined together to logic “0” or ground. The individual segments are illuminated by application of a “HIGH”, logic “1” signal to the individual Anode terminals.
  • 2. The Common Anode Display (CAD) – In the common anode display, all the anode connections of the LED’s are joined together to logic “1” and the individual segments are illuminated by connecting the individual Cathode terminals to a “LOW”, logic “0” signal.

Related Products: Displays

Common Cathode and Common Anode Format

common cathode display

Electrical connection of the individual diodes for a common cathode display and a common anode display and by illuminating each light emitting diode individually, they can be made to display a variety of numbers or characters.

7-Segment Display Format

7-segment display

So in order to display the number 3 for example, segments a, b, c, d and g would need to be illuminated. If we wanted to display a different number or letter then a different set of segments would need to be illuminated. Then for a 7-segment display, we can produce a truth table giving the segments that need to be illuminated in order to produce the required character as shown below.

Truth Table for a 7-segment display

Individual Segments Display
a b c d e f g
× × × × × × 0
× × 1
× × × × × 2
× × × × × 3
× × × × 4
× × × × × 5
× × × × × × 6
× × × 7
Individual Segments Display
a b c d e f g
× × × × × × × 8
× × × × × × 9
× × × × × × A
× × × × × b
× × × × C
× × × × × d
× × × × × E
× × × × F

7-segment display characters

7-Segment Display Elements for all Numbers.

It can be seen that to display any single digit number from 0 to 9 in binary or letters from A to F in hexadecimal, we would require 7 separate segment connections plus one additional connection for the LED’s “common” connection. Also as the segments are basically a standard light emitting diode, the driving circuit would need to produce up to 20mA of current to illuminate each individual segment and to display the number 8, all 7 segments would need to be lit resulting a total current of nearly 140mA, (8 x 20mA).

Related Products: LCD Character Modules

Obviously, the use of so many connections and power consumption is impractical for some electronic or microprocessor based circuits and so in order to reduce the number of signal lines required to drive just one single display, display decoders such as the BCD to 7-Segment Display Decoder and Driver IC’s are used instead.

Binary Coded Decimal

Binary Coded Decimal (BCD or “8421” BCD) numbers are made up using just 4 data bits (a nibble or half a byte) similar to the Hexadecimal numbers we saw in the binary tutorial, but unlike hexadecimal numbers that range in full from 0 through to F, BCD numbers only range from 0 to 9, with the binary number patterns of 1010 through to 1111 (A to F) being invalid inputs for this type of display and so are not used as shown below.

Decimal Binary Pattern BCD
8 4 2 1
0 0 0 0 0 0
1 0 0 0 1 1
2 0 0 1 0 2
3 0 0 1 1 3
4 0 1 0 0 4
5 0 1 0 1 5
6 0 1 1 0 6
7 0 1 1 1 7
Decimal Binary Pattern BCD
8 4 2 1
8 1 0 0 0 8
9 1 0 0 1 9
10 1 0 1 0 Invalid
11 1 0 1 1 Invalid
12 1 1 0 0 Invalid
13 1 1 0 1 Invalid
14 1 1 1 0 Invalid
15 1 1 1 1 Invalid

BCD to 7-Segment Display Decoders

A binary coded decimal (BCD) to 7-segment display decoder such as the TTL 74LS47 or 74LS48, have 4 BCD inputs and 7 output lines, one for each LED segment. This allows a smaller 4-bit binary number (half a byte) to be used to display all the denary numbers from 0 to 9 and by adding two displays together, a full range of numbers from 00 to 99 can be displayed with just a single byte of 8 data bits.

BCD to 7-Segment Decoder

bcd display decoder

The use of packed BCD allows two BCD digits to be stored within a single byte (8-bits) of data, allowing a single data byte to hold a BCD number in the range of 00 to 99.

An example of the 4-bit BCD input ( 0100 ) representing the number 4 is given below.

Display Decoder Example No1

bcd display decoder circuit

In practice current limiting resistors of about 150Ω to 220Ω would be connected in series between the decoder/driver chip and each LED display segment to limit the maximum current flow. There are different display decoders and drivers available for the different types of available displays, either LED or LCD. For example, the 74LS48 for common-cathode LED types, the 74LS47 for common-anode LED types, or the CMOS CD4543 for liquid crystal display (LCD) types.

Liquid crystal displays (LCD´s) have one major advantage over similar LED types in that they consume much less power and nowadays, both LCD and LED displays are combined together to form larger Dot-Matrix Alphanumeric type displays which can show letters and characters as well as numbers in standard Red or Tri-colour outputs.


Join the conversation!

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  • A

    Plz sir give the pin description and circuit diagram of BCD to 7-segment to realize it practically….Thanks

  • h

    please keep pcm encoding and decoding differently

  • E
    Eng Sung

    How do you correct the circuit to make it show numbers 0-9 only?

  • A

    And can ,please, anyone help me out with the BCD-to-seven-segment decoder CIRCUIT……?

  • S

    Nice description but u habe to mention the pin diagram of ic and u have to mention how to connect ic to display with neat pin diagram

  • A

    hello sir,
    the ic 74148 is given to be an active low ic in the book which i am refering.but in your article you have said that it is an active high encoder.which one is correct?
    i would also request you to kindly cover an article on hex code to binary encoder

  • P

    sir, can u explain me about logisim BCD to 7 segment decoder circuit in detail

  • D

    How to make use of 74LS74 drawing 3digit LED 7 segment display which makes provision for leading 0

  • R

    More tq u for ur explained

  • n

    can you send me a wiring connection from decoder to hex display 7 LED since the one I have (hex display) holds 5 pins up and 5 pins down but confused how to connect the one I have has no numbering as I understood correct please if facing the display first up left pin in 10 next to it 9 next com 8 what means negative supply? after 7 and 6, below left 1-2-3 com same as 8 ?-4- and dot 5
    thank you

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