Patent ID: 11881363
Assignee: DARFON ELECTRONICS CORP.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC F  H

Claim 17:
18. A backlight module configured to illuminate at least one key cap, the backlight module comprising a light guide plate, a light emitting unit and a lighting board, the backlight module defining a plurality of uniform light areas to make light of the light emitting unit uniform, the plurality of uniform light areas comprising:
a first area surrounding the light emitting unit, the first area comprising an inner ring section of a first reflective layer and a pair of pads, the pair of pads being located on the lighting board and configured to connect the light emitting unit, the inner ring section of the first reflective layer at least partially covering the pair of pads, the inner ring section of the first reflective layer reflecting and diffusing light of the light emitting unit; and
a second area surrounding the first area, the second area 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, the pair of micro-structure regions reflecting and diffusing light of the lighting emitting unit transmitted through the light guide plate.