Patent ID: 11940645
Assignee: DARWIN PRECISION CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G | IPC F

Claim 18:
19. A front light guide plate of high-contrast structure, comprising:
a front light guide plate including a micro-structure, and the micro-structure is recessed or convex, wherein a first angle is between a surface of the micro-structure close to a light emitting unit and an upper surface of the front light guide plate, a second angle is between a surface of the micro-structure away from the light emitting unit and the upper surface of the front light guide plate, and a third angle is between the surface of the micro-structure close to the light emitting unit and the surface of the micro-structure away from the light emitting unit, wherein the first angle is in a range between 30 degrees and 60 degrees, the second angle is in a range between 30 degrees and 59 degrees, and the third angle is greater than 90 degrees, wherein a footprint of the micro-structure on the upper surface of the front light guide plate has an asymmetrical and general dumbbell shape in a top view.