Lighting keyboard and backlight module thereof

A lighting keyboard comprising:

• at least two adjacent keycaps;
• and
• a backlight module located below the at least two adjacent keycaps, the backlight module comprising:
• a shielding sheet comprising at least two outlet areas corresponding to the at least two adjacent keycaps;
• a lighting board comprising at least two illuminant units respectively corresponding to the at least two outlet areas;
• and
• at least two protrusion structures respectively formed at the at least two outlet areas of the shielding sheet and protruding towards the lighting board, the at least two protrusion structures respectively diffusing partial light of the at least two illuminant units.

A lighting keyboard comprising:

• at least three adjacent keycaps;
• and
• a backlight module located below the at least three adjacent keycaps, the backlight module comprising:
• a shielding sheet;
• a lighting board comprising at least three illuminant units respectively corresponding to the at least three adjacent keycaps;
• and
• at least three protrusion structures respectively formed at the shielding sheet and protruding towards the lighting board, the at least three protrusion structures respectively diffusing partial light of the at least three illuminant units;
• wherein the backlight module has a board hole and at least one micro-structure region surrounding the board hole, and the at least one micro-structure region is located between the board hole and the at least three protrusion structures in top view.