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Multiplexed displays are electronic displays where the entire display is not driven at one time. Instead, sub-units of the display (typically, individual pixels but often individual characters or numbers) are multiplexed, that is, driven one at a time, but the electronics and the persistence of vision combine to make the viewer believe the entire display is continuously active.A multiplexed display has several advantages compared to a non-multiplexed display:Fewer wires (sometimes, far fewer wires) are needed Simpler driving electronics can be used And both lead to reduced cost Reduced power consumption Because most multiplexed displays do not present the entire display simultaneously, they are subject to "break up" if the observer's point of regard is in motion. For example, if the observer were to rapidly swing their vision across a multiplexed display, they might see a jumble of individual digits rather than a coherent display. This effect can also sometimes be provoked by chewing hard candy*; this causes vibration of the user's eyes, leading to the break-up of the display.