![]() ![]() Current flows through (1), (2) and (3).Ī practical circuit uses tranistorised switches. ![]() By closing switches 2 and 6 we can turn on LED 7 alone. In practice some form of current limiting is required. Each LED can be turned on individually by closing the appropriate row and column switches. Multiplexed displays using seven-segment LEDs remain popular due to low cost and high brightness. The advantage is simplification of hardware due to the reduced number of pins required. Multiplexing is a technique used to connect devices – typically LEDs (for displays) or buttons (for keyboards) – in a matrix of addressable rows and columns.
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