What are the advantages of using BJT switches for a 7 segment display schematic?

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NPN and PNP BJTs are used in schematics as controlled switches for 7-segment displays. They enable higher current flow than what many output chips can provide, making them suitable for driving displays. This capability allows for better performance and reliability in circuits requiring significant power. Using BJTs can also improve the overall efficiency of the display operation. Employing BJT switches is beneficial for ensuring adequate brightness and functionality of 7-segment displays.
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May i know what is the use of the npn and pnp bjt for my schematic? can someone please advise. Thank You
 

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I would guess they're acting as controlled switches. BJT switches generally have the advantage of allowing more current to pass than can be drawn from the output of many chips.
 

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