In the common anode type all the anodes on the display are tied to a common pin, typically the power source, and the LEDs are controlled via the cathodes with the ground being on and power being off.
There are two different types of driving seven-segment displays:- the common anode type and the common cathode type. Seven-segment displays are widely used in digital clocks, electronic meters, basic calculators, displays in home appliances, cars, and various other electronic devices that display numerical information. The segments are usually single LEDs or liquid crystals. They are called segment displays because they are composed of several segments that switch on and off to give the appearance of the desired glyph. Seven-segment displays first became widely used as a popular way of displaying numbers.
Seven-segment displays are electronic display devices used as an easy way to display decimal numerals and an alternative to the more complex dot-matrix displays.
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