The focus of Apple Inc (NASDAQ:AAPL) and Samsung Electronics courtroom battle shifted to the iPhone's iconic display on Tuesday, as the U.S. company called on a former employee and award-winning graphic designer to back up claims that Samsung gadgets look "confusingly similar."

Susan Kare, who from 1982 to 1986 had a hand in designing icons for the original Macintosh computers, scrutinized 11 of the Korean firm's phones - including the Galaxy S and Epic 4G - and found icons and layouts on screens to be very similar.

Apple is contending that buyers may confuse Samsung devices with the iPhone, and accuses the Asian firm of copying designs and features. Samsung, in turn, has accused Apple of violating Samsung wireless technology patents.

Kare - who is also credited for Microsoft Corp icons such as the "Notepad" and for its deck of "Solitaire" game cards - testified that even she was fooled by a Samsung gadget at a pre-trial meeting.