US 12,372,705 B2
Light guide plate with asymmetrical optical microstructures
Tsang-Chi Wang, Tainan (TW); Hsin Wen Chang, Tainan (TW); Hung Yu Lin, Tainan (TW); and Yung Pin Chen, Tainan (TW)
Assigned to CM Visual Technology Corporation, Tainan (TW)
Filed by CM Visual Technology Corporation, Tainan (TW)
Filed on Mar. 8, 2024, as Appl. No. 18/599,252.
Claims priority of provisional application 63/526,201, filed on Jul. 12, 2023.
Prior Publication US 2025/0020852 A1, Jan. 16, 2025
Int. Cl. G02B 6/00 (2006.01); F21V 8/00 (2006.01)
CPC G02B 6/0043 (2013.01) [G02B 6/0038 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A light guide plate, comprising:
a light incident surface;
a first surface, connected to the light incident surface; and
a plurality of optical microstructures, disposed on the first surface, wherein each of the optical microstructures has a first cross-sectional profile along a first cross-section and a second cross-sectional profile along a second cross-section, the first cross-section is perpendicular to the second cross-section, the first cross-sectional profile is different from the second cross-sectional profile, an orthographic projection profile of each of the optical microstructures is circular, the optical microstructures includes a plurality of first optical microstructures and a plurality of second optical microstructures, the second cross-sectional profile of each first optical microstructure is different from the second cross-sectional profile of each second optical microstructure, the first optical microstructures are arranged in a first direction, the second optical microstructures are arranged in a second direction, the first direction intersects the second direction, each of the first optical microstructures and the second optical microstructures has a symmetry plane coincident with the first cross-section and not being perpendicular to the light incident surface, the symmetry planes of the first optical microstructures are parallel to each other, the symmetry planes of the second optical microstructures are parallel to each other and intersect the symmetry planes of the first optical microstructures, the first optical microstructures includes a first group and a second group, the symmetry planes of the first group of the first optical microstructures are coplanar, the symmetry planes of the second group of the first optical microstructures are coplanar, the symmetry planes of the first group of the first optical microstructures are not coplanar with the symmetry planes of the second group of the first optical microstructures, and the first group of the first optical microstructures does not overlap the second group of the first optical microstructures along the first direction.