curious

Everything is so vigorously Optimus is discussing the Epplowski patent ... But I was curious: really, nobody has yet patented an analogue, where each key is not an OLED display, but an E-ink? Exclusively based on the purpose (not very often changing image, not too high power consumption) I personally thought that such buttons were the ideal option, where the surface is a display on "electronic ink" ... It is curious what their relative cost is ...