Backlight module for lighting keyboard

A backlight module for a lighting keyboard, comprising:

• a plurality of microstructure regions;
• a light guide panel;
• and
• a shielding sheet disposed on the light guide panel and disposed above the plurality of microstructure regions, the shielding sheet having a plurality of translucent regions, the plurality of microstructure regions being partly exposed in each of the plurality of translucent regions;
• wherein the backlight module is divided into a plurality of regions including a middle region and two first side regions, the two first side regions are located outside the middle region, the plurality of translucent regions are distributed in the middle region and the two first side regions, and an average density of microstructural dots of one of the plurality of microstructure regions exposed by one of the plurality of translucent regions which is in the middle region relative to an area of the one of the plurality of translucent regions which is in the middle region is lesser than an average density of microstructural dots of another one of the plurality of microstructure regions exposed by another one of the plurality of translucent regions which is in one of the two first side regions relative to an area of the another one of the plurality of translucent regions which is in the one of the two first side regions.

A backlight module for a lighting keyboard, comprising:

• a lighting board;
• a light guide panel disposed on the lighting board;
• and
• a shielding sheet disposed on the light guide panel, the shielding sheet having a plurality of translucent regions and a plurality of inner reflective sections, each of the plurality of inner reflective sections being in each of the plurality of translucent regions;
• wherein the backlight module is divided into a plurality of regions including a middle region and two first side regions, the two first side regions are located outside the middle region, the plurality of translucent regions are distributed in the middle region and the two first side regions, and a size of one of the plurality of inner reflective sections in one of the plurality of translucent regions which is in the middle region is lesser than a size of another one of the plurality of inner reflective sections in another one of the plurality of translucent regions which is in one of the two first side regions.