change the display format -display value of my taxonomy column [ managed metadata column ] programmatically.

hi all,

 I want to change the display format of my taxonomy column [ managed metadata  column ] programmatically.

is this possible through power shell, if anyone knows ,pls  help  how to change the display format- display value :

 from "display term lable in the field "  to "display the entire path to the term in the field"

help is highly  appreciated!