This difference between the two is that an LED emits light energy from its PN-junction when an electrical current passes through it.
So how can we do this.ħ-segment displays provide a convenient way of displaying numerical information from zero to nine as they basically consist of a load of light emitting diodes connected together within a single indicator package.Įach light emitting diode (called a segment) is illuminated using an electrical current, and by illuminating various combinations of segments so that some segments will be turned “ON” and emitting light while others will be turned “OFF” we can display individual characters or numbers.Īs we saw in our tutorial about the Light Emitting Diode, LEDs are just like normal diodes, in that they only allow current to flow in one direction. But sometimes as an Electronics student or hobbyist we want to display two or more numbers or digits as part of our project or digital logic circuit. Nowadays it is very easy to display numbers and letters across multiple LED displays using micro-controllers, such as the Arduino or Raspberry-Pi, along with a small bit of software related code to display the required digits.
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