The 7 segments are configured in the shape of a digit eight and can be individually regulated to show any of 10 digits from zero to 9. The 4-digit 7segment display has four separate digits with every digit consisting of 7 segments which can be on or off to display numbers and letters.For instance to display number 7 input values are 1, 1, 1, 0, 0, 0, and 0, which will display the segments A, B, C, and G. We can use this table to find input values to display and the required digit or character on 7 segment display.Here we have made a truth table for the common cathode 7-segment display: The truth table of 7 segment display draws every possible combination of inputs to correspondent output segments which have to be illuminated to display the required character or digit.Through accurate on and off of LED segments any special number of characters can be displayed If voltage is applied to certain LED segments of the display it gets on and a correspondent character or number is displayed. The working of 7 segment display is very simple.Indicates whether the display is a common anode or cathode type The temperature range at which the display can be stored The temperature range at which the display can operate The brightness of the LED in millicandelas or candelas The amount of power dissipated by the display The maximum current that can be passed through each LED The voltage required for the LED to turn on The height of each segment in millimeters or inches Its operating temperature is -40☌ to 85☌.The power dissipation is the amount of power that 7 segment display can dissipate without any damage.The reverse voltage is a voltage applied to the LED segments of 7 segments displayed in the reverse direction.The peak current is the highest current that can pass through LED segments of 7 segments display.It is current need to on the LED segments of 7 segments display.The forward voltage loss is the voltage need to on the LED segments of 7 segments display.There are some important specifications of a 7-segment display are explained.When a common cathode is connected with a negative supply and the anode of a certain LED is connected to a positive supply LED gets on The anodes of every LED are also made of a single pinout. In a common cathode 7-segment display all cathodes of LEDs are connected with each other and make a single-pin configuration.When the common anode is connected with a positive supply and the cathode of a certain LED is attached to a negative supply LED gets turned on The cathodes of every LED are also configured as a single distinct pinout. In common anode 7 segment display all anodes of LEDS are configured with each other and make a single pin configuration.There are two main types of 7 segment display There are two types of 7-segment displays: The first one is Common Anode and the second one is Common Cathode.The decimal point or DP anode can be on by applying the HIGH signal to its related pinout 8 for anode pins of required segments.
If many segments have to be on at the same time to display a number or character, the resultant anode pins are on with a signal high or low, and the common anode or common cathode pin is at the opposite signal that is low or high].In the case of common cathode displays HIGH signal is given to the common cathode pin on the selected segment In the case of a common anode display the LOW signal is given to the common anode pin on the selected segment.When a certain segment is required to be on the HIGH signal is given to the related anode pin.The anode of every segment A to G is connected with individual pins 1 to 7 and cathodes of all segments are connected with common anode or common cathode pin 9 or 10.7 Segment Display Pinout Working Description
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