Interfacing Large 7Segment

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Hi all
I have a Temperature sensing devices.it shows the temperature value by Three 7 Segment display (Common anode) . and all other pins in segments are connected parallely

a---a---a
b---b---b
c---c---c
d---d---d
e---e---e
f---f---f
g---g---g

Now i want to connect a Large size LED segment (there are 20 LEDs connected parallely in a single segment )can somebody give me a idea to do this. I dont know how to boost the current (Driving Circuit) for 20 LEDs

English is not my first language

Thanks
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