US 11,940,645 B2
Front light module and front light guide plate of high-contrast structure
Chun-Te Wang, Hsinchu County (TW); Yu-Shan Shen, Hsinchu County (TW); and Yen-Lung Chen, Hsinchu County (TW)
Assigned to DARWIN PRECISIONS CORPORATION, Hsinchu County (TW)
Filed by Darwin Precisions Corporation, Hsinchu County (TW)
Filed on Sep. 12, 2022, as Appl. No. 17/942,299.
Claims priority of application No. 111129752 (TW), filed on Aug. 8, 2022.
Prior Publication US 2024/0045131 A1, Feb. 8, 2024
Int. Cl. F21V 8/00 (2006.01)
CPC G02B 6/0043 (2013.01) 20 Claims
OG exemplary drawing
 
1. A front light module, comprising:
a reflective display device;
a light emitting unit configured to emit light; and
a front light guide plate located over the reflective display device and includes 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 the 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.