Last I checked there were over a dozen patents from the 1990s to the 2010s that cover everything from manufacturing to software. IIRC the most important patents actually cover some algorithms on the display controller that won't be public domain until the mid to late 2020s.
IIRC it gets a bit messy once we start talking about hardware implementations of algorithms. I mean, is an electronics circuit that essentially implements an algorithm still a software patent?
