Backlit circuit board, backlit keyswitch and keyboard

Abstract

A backlit circuit board for supporting a keycap is provided. The backlit circuit board includes a substrate having a plurality of ribs configured to define a plurality of openings penetrating through the substrate and a plurality of coupling members disposed on the substrate and configured to directly or indirectly connect the keycap, a lighting circuit disposed on the substrate at a same side as the coupling members and extending over the plurality of ribs, and an illuminant electrically connected to the lighting circuit and disposed on one of the plurality of ribs, wherein the illuminant vertically corresponds to a light impermeable region of the keycap, and a vertical projection of the light impermeable region at least partially overlaps the plurality of ribs.

Dependencies are inferred from the claim text.