We know that LEDs are very popular display devices. ey are easy to use and give very bright
and pleasing display which can be viewed equally well from any viewing angle, unlike LCDs.
e only drawback with LED displays is the high amount of current they need, unlike LCDs
which need very low power. Figure 9.39 shows that a single LED can be connected to a positive
power supply as shown. e value of the current limiting resistor depends on the current rating
of the LED. Suppose we need a number of LEDs for displays, we usually use only one power
source for all of them. In that ...
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