Need an actuator which works on digital signal

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anandmakate

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Need an actuator

Hi friends, Iam in search of an actuator which works on digital signal.Its diameter shoul be around half an inch.It should work something like top of the tic-toc pen.
When a signal is given it it should project outwards and when the signal in inverted it should go in. I need lot many of these.I have to arrange these like LED matrix for my application.Please help me out.

Thanks in advance
 

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