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AS1130-Slide6

The first main difference between multiplexing and crossplexing is quite easily seen. As shown in the example on this slide, in an 8x9 matrix as used in the AS1119, the pin count required is reduced by nearly one half. For driving a “N x M” matrix using multiplexing “N + M” pins are necessary, for crossplexing only “M” pins are needed. In other words, take the amount of available pins as “P” and the circuit is able to drive (P)*(P-1) LEDs, in the example on this slide 9*8 = 72 LEDs. For the same number of LEDs using multiplexing 17 pins are required. When multiplexing, the source and sinks are separated whereas when crossplexing each individual pin is a shared sink or source. At the same refresh rate the brightness of the LEDs will be the same.

PTM Published on: 2012-01-18