Lighting keyboard, backlight module and lighting board

A backlight module configured to illuminate at least one key cap, the backlight module comprising:

• a light emitting unit;
• a light guide plate having a light guide hole for accommodating the light emitting unit;
• a lighting board having a pair of pads connected to the light emitting unit respectively, the lighting board comprising a first reflective layer surrounding the light emitting unit and at least partially overlapping with the pair of pads, the lighting board further comprising a pair of micro-structure regions apart from each other and located on the first reflective layer, the pair of micro-structure regions jointly surrounding the pair of pads;
• and
• an adhesive layer disposed above the lighting board, the adhesive layer at least partially overlapping with the pair of micro-structure regions.

A lighting board comprising:

• two non-intersecting traces;
• a plurality of micro-structure regions, two of the plurality of micro-structure regions being apart from each other and not overlapping with the two non-intersecting traces;
• a light emitting unit located between the two micro-structure regions;
• and
• a pair of pads electrically connected to the two non-intersecting traces and the light emitting unit, each of the pair of pads having at least one branch to form a pair of flat sides parallel to each other, each of the pair of pads further having at least one hollow area, the light emitting unit overlapping with at least one part of the at least one hollow area of the pair of pads.