Key scanning method and input device implemented therewith

A key scanning method for a plurality of keyboard keys grouped into at least a first key group and a second key group, comprising:

• triggering a first main scan line electrically connected to the first key group and reading electrical signals received via a plurality of first signal sensing lines electrically connected to the first key group to determine whether any said keyboard key among the first key group is triggered;
• and
• triggering a non-triggered one of a plurality of second scan lines electrically connected to the second key group and reading electrical signals received via a plurality of second signal sensing lines electrically connected to the second key group to determine whether any said keyboard key among the second key group is triggered;
• wherein the first main scan line and the second scan lines are triggered one after another, and each of the plurality of second scan lines is triggered at least once;
• wherein a number of times that the first main scan line is triggered is at least twice a number of times that each of the plurality of second scan lines is triggered.

An input device configured with a key scan circuit and a plurality of keyboard keys, the plurality of keyboard keys being grouped into a first key group and a second key group;

• wherein the key scan circuit scans the plurality of keyboard keys under a first scan mode by:
• triggering a first scan line electrically connected to the first key group and reading electrical signals received via a plurality of signal sensing lines electrically connected to the first key group to determine whether any said key among the first key group is triggered;
• and
• triggering a non-triggered one of a plurality of second scan lines electrically connected to the second key group and reading electrical signals received via another plurality of signal sensing lines electrically connected to the second key group with the plurality of keys to determine whether any said key among the second key group is triggered;
• wherein the first scan line and one of the second scan lines are triggered one after another for multiple times, until each of the plurality of second scan lines is triggered at least once to complete one scan cycle.