Nikkai is showing some OLED buttons at CEATEC. The buttons are bulkier than anything on an Art Lebedev product, and seem to have three input states: depressed, tilted left and tilted right (or up and down, depending on orientation) which makes makes for what amounts to a highly versatile and communicative switch. A second button is a simpler in/out configuration, albeit with a larger screen 64×48.
