Anti-ghost key design for a notebook keyboard
Chun-Hung Cheng, Ying‐Wen Bai · 2015
This paper proposes a new anti-ghost key design to prevent any conflict of the locations of the keys of a keyboard in a notebook. Previous notebooks often have an embedded controller (EC) both for typical I/O functions and for the keyboard function. In order to provide a better ghost key prevention, as we mainly expand the matrix of the internal keyboard matrix from 8*16 pins to 8*44 pins, we need to add on a second low-power embedded controller not only to control the internal keyboard independently but also to increase the length of the ghost keys by a wide margin. This design will not cause any conflict if 43 keys are pressed simultaneously and will provide a better notebook keyboard design for multiple-key pressing while playing most game software.