Apple has won a US patent on an accessory that adds tactile buttons to the display of a multi-touch device. AppleInsider notes that the accessory would use suction to stick to a screen, and feature buttons that deform and spring back as they're pushed. To actually register touch input, tiny rubber or metal pucks might be embedded into the buttons. Some buttons could be used as finger rests, and Apple also suggests that the patent could be applied to a joystick.
