7-Segment Display and Driving a 7-Segment Display

8/18/2019 7-Segment Display and Driving a 7-Segment Display

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9/1/2015 7-segment Display and Driving a 7-segment Display

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7 Segment Display

LED Driver Circuit

Circuit Diagram

7-segment Displ

7-segment Display

The 7-segment Display

An LED or Light Emitting Diode, is a solid state optical PN-junction diode which emits light energy in the form

“photons” when it is forward biased by a voltage allowing current to flow across its junction, and in Electronics we

this process electroluminescence.

The actual colour of the visible light emitted by an LED, ranging from blue to red to orange, is decided by the spectral wavelen

of the emitted light which itself is dependent upon the mixture of the various impurities added to the semiconductor materused to produce it.

Light Emitting Diodes (http://amazon.in/s/?field-keywords=Light-Emitting+Diodes) have many advantages

over traditional bulbs and lamps, with the main ones being their small size, long life, various colours,

cheapness and are readily available, as well as being easy to interface with various other electronic

components and digital circuits.

But 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 7-segment display , also written as “seven segment display”, consists of seven LEDs (hence its name)

arranged in a rectangular fashion as shown. Each of the seven LEDs is called a segment because whenilluminated 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) when two or more 7-segment displays are connected together to display numbers greater than ten.

Each one of the seven LEDs in the display is given a positional segment with one of its connection pins being brought straight

of the rectangular plastic package. These individually LED pins are labelled from a through to g representing each individual L

The other LED pins are connected together and wired to form a common pin.

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So by forward biasing the appropriate pins of the LED segments in a particular order, some segments will be light and others

be dark allowing the desired character pattern of the number to be generated on the display. This then allows us to display e

of the ten decimal digits 0 through to 9 on the same 7-segment display.

The displays common pin is generally used to identify which type of 7-segment display it is. As each LED has two connecting p

one called the “Anode” and the other called the “Cathode”, there are therefore two types of LED 7-segment display call

Common Cathode (CC) and Common Anode (CA).

The difference between the two displays, as their name suggests, is that the common cathode has all the cathodes of the

segments connected directly together and the common anode has all the anodes of the 7-segments connected together and

illuminated as follows.

1. The Common Cathode (CC) – In the common cathode display, all the cathode connections of the LED segments are joi

together to logic “0” or ground. The individual segments are illuminated by application of a “HIGH”, or logic “1” signal via a curr

limiting resistor to forward bias the individual Anode terminals (a-g).

Common Cathode 7-segment Display

2. The Common Anode (CA) – In the common anode display, all the anode connections of the LED segments are joined toget

to logic “1”. The individual segments are illuminated by applying a ground, logic “0” or “LOW” signal via a suitable current limi

resistor to the Cathode of the particular segment (a-g).

Common Anode 7-segment Display

In general, common anode displays are more popular as many logic circuits can sink more current than they can source. A

note that a common cathode display is not a direct replacement in a circuit for a common anode display and vice versa, as

the same as connecting the LEDs in reverse, and hence light emission will not take place.


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Depending upon the decimal digit to be displayed, the particular set of LEDs is forward biased. For instance, to display t

numerical digit 0, we will need to light up six of the LED segments corresponding to a, b, c, d, e and f. Then the various digits fr

0 through 9 can be displayed using a 7-segment display as shown.

7-Segment Display Segments for all Numbers.

Then for a 7-segment display, we can produce a truth table giving the individual segments that need to be illuminated in orde

produce the required decimal digit from 0 through 9 as shown below.

7-segment Display Truth Table

Decimal

Digit

Individual Segments Illuminated

a b c d e f g

0 × × × × × ×

1 × ×

2 × × × × ×

3 × × × × ×

4 × × × ×

5 × × × × ×

6 × × × × × ×

7 × × ×

8 × × × × × × ×

9 × × × × ×

Driving a 7-segment DisplayAlthough a 7-segment display can be thought of as a single display, it is still seven individual LEDs within a single package and

such these LEDs need protection from over current. LEDs produce light only when it is forward biased with the amount of l

emitted being proportional to the forward current.This means then that an LEDs light intensity increases in an approximately linear manner with an increasing current. So t

forward current must be controlled and limited to a safe value by an external resistor to prevent damage to the LED segments

The forward voltage drop across a red LED segment is very low at about 2-to-2.2 volts, (blue and white LEDs can be as high as

volts) so to illuminate correctly, the LED segments should be connected to a voltage source in excess of this forward volta

value with a series resistance used to limit the forward current to a desirable value.

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Typically for a standard red coloured 7-segment display, each LED segment can draw about 15 mA to illuminated correctly, so

a 5 volt digital logic circuit, the value of the current limiting resistor would be about 200Ω (5v – 2v)/15mA, or 220Ω to the nea

higher preferred value.

So to understand how the segments of the display are connected to a 220Ω current limiting resistor consider the circuit below

Driving a 7-segment Display

In this example, the segments of a common anode display are illuminated using the switches. If switch a is closed, current

flow through the “a” segment of the LED to the current limiting resistor connected to pin a and to 0 volts, making the circuit. Th

only segment a will be illuminated. So a LOW condition (switch to ground) is required to activate the LED segments on

common anode display.

But suppose we want the decimal number “4” to illuminate on the display. Then switches b, c, f and

g would be closed to light the corresponding LED segments. Likewise for a decimal number “7”,

switches a, b, c would be closed. But illuminating 7-segment displays using individual switches is

not very practical.

7-segment Displays are usually driven by a special type of integrated circuit (IC) commonly known

as a 7-segment decoder/driver, such as the CMOS 4511. This 7-segment display driver which is

known as a Binary Coded Decimal or BCD to 7-segment display decoder and driver, is able to

illuminate both common anode or common cathode displays. But there are many other single and

dual display drivers available such as the very popular TTL 7447.

This BCD-to-7 segment decoder/driver takes a four-bit BCD input labelled A, B, C and D for the

digits of the binary weighting of 1, 2, 4 and 8 respectively, has seven outputs that will pass current

through the appropriate segments to display the decimal digit of the numeric LED display.

The digital outputs of the CD4511 are different from the usual CMOS outputs because they can

provide up to 25mA of current each to drive the LED segments directly allowing different coloured

LED displays to be used and driven.

Driving a 7-segment Display using a 4511

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In this simple circuit, each LED segment of the common cathode display has its own anode terminal connected directly to

4511 driver with its cathodes connected to ground. The current from each output passes through a 1kΩ resistor that limits it t

safe amount. The binary input to the 4511 is via the four switches. Then we can see that using a BCD to 7-segment display dri

such as the CMOS 4511, we can control the LED display using just four switches (instead of the previous 8) or a 4-bit binary sig

allowing up to 16 different combinations.

Most digital equipment use 7-segment Displays for converting digital signals into a form that can be displayed and understo

by the user. This information is often numerical data in the form of numbers, characters and symbols. Common anode a

common cathode seven-segment displays produce the required number by illuminating the individual segments in vario

combinations.

LED based 7-segment displays are very popular amongst Electronics hobbyists as they are easy to use and easy to understand

most practical applications, 7-segment displays are driven by a suitable decoder/driver IC such as the CMOS 4511 or TTL 74

from a 4-bit BCD input. Today, LED based 7-segment displays have been largely replaced by liquid crystal displays (LCDs) wh

consume less current.

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28 Responses to “7-segment Display”

Older comments (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html/comment-page-1#comment

Tags: Digital Logic (http://www.electronics-tutorials.ws/tag/digital-logic) Display (http://www.electronics-tutorials.ws/tag/displ

LED (http://www.electronics-tutorials.ws/tag/led) Miscellaneous (http://www.electronics-tutorials.ws/tag/miscellaneous)

Vincent

Thanks so much have learnt a lot.am doing a project whereby the output signal is from an op-amp,how can i incoporate a

display to this circuit please?

August 23rd, 2015 (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html/comment-page-2#comment-7894)Reply (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html?replytocom=7894#respond)

Roja

why the number 1 displays in b and c position only why not in e and f?

August 19th, 2015 (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html/comment-page-2#comment-7834)Reply (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html?replytocom=7834#respond)

Ray

I trying to locate a 2 digit white led display 7 segment Common cathode

has to be 16 pin, I need this for my project radio channel display. July 30th, 2015 (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html/comment-page-2#comment-7537)

Reply (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html?replytocom=7537#respond)

Hamza Anis

I want to exceed from 1 digit to 2 digit how will i do it. By using 2 SSD and i decoder.

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May 27th, 2015 (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html/comment-page-2#comment-6934)ep y ttp: www.e ectron cs-tutor a s.ws og -segment- sp ay-tutor a . tm rep ytocom= respon

grandia

how to combine seven segment and traffic light.pls

April 21st, 2015 (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html/comment-page-2#comment-6625)Reply (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html?replytocom=6625#respond)

grandia

if u know can u give the project


Wayne Storr (http://www.electronics-tutorials.ws)

Traffic lights use LEDs not 7-seg. displays


shahriar

thanks

April 13th, 2015 (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html/comment-page-2#comment-6539)Reply (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html?replytocom=6539#respond)

Louis Nemick

I have a 7 segmnet display that I would like to use a nte4558b chip. Is this possible. I also have a cd4511b and have two of

them. I have 4 displays to drive. And one question how many of the drivers do I need to drive the displays.

Thank you in advance.

Lou

February 13th, 2015 (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html/comment-page-2#comment-5920)Reply (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html?replytocom=5920#respond)

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Just one, parallel up the pins of the displays and switch each one ON in turn.

February 13th, 2015 (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html/comment-page-2#comment-5925)Reply (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html?replytocom=5925#respond)

paagal

English only!

December 17th, 2014 (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html/comment-page-2#comment-5283)Reply (http://www.electronics-tutorials.ws/blog/7-segment-display-tutorial.html?replytocom=5283#respond)

Charan

I have a seven segment the model number is KP2-3102 (under it, says D H B D 4). Is my seven segment common anode or

common cathode



Check the manufacturers datasheet.


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7-Segment Display and Driving a 7-Segment Display

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