I agree with *Dan Diplo* and to add to what he said, also **Google itself uses `display: none` in its HOME PAGE**, so it can't really be a problem using it, as long as you don't use it for spamming (i.e. inserting hundreds fo keywords in a display:none DIV panel).

Open [Google HOME PAGE][1] and look in HTML source code. Search for `display:none` you are gonna see it many times. :)


  [1]: http://www.google.com