Calculator Components If you've read the prior page, you'll know by this point that portable calculators need microprocessors with a single chip to function. But how do you activate the microprocessor? It all starts with the information on the outside of the device. Many modern calculators have a durable plastic casing with small holes in the front, which allow the rubber to be pushed through similar to a TV remote. When you press a button, you create a circuit beneath the rubber that sends electrical impulses to a circuit board below. The electrical impulses then travel to the microprocessor that interprets the information and sends an output to the display screen of the calculator. The displays of the first electronic calculators comprised of LEDs, also known as light-emitting diodes . Modern models that consume less power are equipped with the liquid crystal display also known as LCD. Instead of producing light LCDs alter light molecules to create a patte...
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