Hi Srikanth,

there are many nice LED drivers.
E.g. the MAX7219 (Farnell-No.: 483-217),
which need only 3 wire to your micro and can drive up
to 8 digits.

But the nicest device I found on the TSM6755
(Farnell-No.: 325-041).
Its a complete 4 digit display including the driver circuit
and need only 2 wire to the micro.
For 8 digits you can cascade 2 of it on the same 2 wire.

I can give you software for both devices.


Peter