Multifunction keyboards using the LEDs

Explain how the multifunction keyboards may be developed by using the LEDs?

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Designs utilizing the LEDs have the arrays of standard-sized push button switches along with the legends built into the surface of switches. These legends are produced by small arrays of matrix addressable LEDs within the switch cover. Color may be used if wished. The legends are altered by the user or automatically by the aircraft since the mission phase alters.

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