Backlight module for lighting keyboard

A backlight module for a lighting keyboard, the lighting keyboard comprising a first key and a second key, the backlight module comprising:

• a lighting board having an light emitting unit;
• a light guide panel;
• and
• a shielding sheet, wherein the lighting board, the light guide panel, and the shielding sheet are stacked from top to bottom;
• wherein, the backlight module has at least two penetration channels respectively and symmetrically corresponding to the first key and the second key and penetrating the lighting board, the light guide panel and the shielding sheet;
• a periphery of each of at least two penetration channels is provided with one light-reducing pattern for blocking light;
• at least two diffusion patterns are disposed adjacent to the at least two light-reducing patterns to guide light to illuminate the first key and the second key;
• the at least two light-reducing patterns and the at least two diffusion patterns respectively form at least two heat-reducing optical pattern groups;
• and the at least two heat-reducing optical pattern groups respectively corresponding to the first key and the second key have identical patterns;
• wherein, the backlight module has a colored material layer disposed on the shielding sheet or the light guide panel and vertically overlapping with the second key;
• a light from the light emitting unit is guided by the light guide panel to pass through a side of the light-reducing pattern corresponding to the first key and form a first color light upward from an inner outlet of the first key;
• and the light from the light emitting unit is further guided by the light guide panel to pass through the colored material layer and a side of the light-reducing pattern corresponding to the second key and form a second color light different from the first color light upward from an inner outlet and a boundary of the second key.

A backlight module for a lighting keyboard, the lighting keyboard comprising a first key and a second key, the backlight module comprising:

• a lighting board having an light emitting unit;
• a light guide panel;
• and
• a shielding sheet, wherein the shielding sheet, the light guide panel, and the lighting board are stacked from top to bottom, and the shielding sheet has a light-reducing pattern corresponding to the first key for blocking light;
• wherein, the backlight module has a colored material layer vertically overlapping with the second key;
• a light from the light emitting unit is guided by the light guide panel to pass through a side of the light-reducing pattern and form a first color light upward from an inner outlet of the first key;
• and the light from the light emitting unit is further guided by the light guide panel to pass through the colored material layer and form a second color light different from the first color light upward from an inner outlet of the second key.