The resistor is given positive voltage and any of the segments (A to G) is connected to ground. The common terminal of the display is connected to a current limiting resistor. To determine whether the 7 – segment display is common anode or cathode, a small test circuit can be built. The equivalent circuit of a 7 – segment display in common anode and common cathode configuration is shown below. The following figure shows the pattern of digits displayed by a 7 – segment LED display.Īs mentioned earlier, in a 7 – segment display, the LEDs can be arranged in common anode or common cathode mode. The following figure shows a general representation of 7 – segment LED display with dedicated names to each segment.Įach segment can be powered separately to display digits from 0 to 9. Each LED bar is in the form of a hexagon and the overall arrangement will be in the form of ‘8’. Working of 4 – Digit 7 – Segment LED DisplayĪ 7 – Segment LED display, as the name indicates, is an assembly of LED bars, where each bar can be powered individually. 4 – Digit compact 7 – segment LED display - 1(Or)7 – Segment LED display - 4.Working of 4 – Digit 7 – Segment LED Display.
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