A company named, Tomita Technologies has sued Nintendo claiming the tech behind Nintendo 3DS hardware has violated a few patents held by them. The handheld uses auto-stereoscopic display which does not require any glasses.
The company claims Nintendo violated U.S. Patent No. 7,417,664, known as “Stereoscopic Image Picking Up and Display System Based Upon Optical Axes Cross-Point Information,” which was applied in 2008.
Nintendo has yet to respond to the lawsuit but you can be sure, they will give a fitting reply. Nintendo 3DS was launched in March this year and is the successor to the popular Nintendo DS.