US 11,852,859 B2
Light source module and display device
Tzeng-Ke Shiau, Hsin-Chu (TW); Yi-Cheng Lin, Hsin-Chu (TW); Chia-Liang Kang, Hsin-Chu (TW); Shih-Wei Liu, Hsin-Chu (TW); Wei-Chun Yang, Hsin-Chu (TW); and Cheng-Yi Tseng, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Feb. 22, 2023, as Appl. No. 18/112,511.
Claims priority of application No. 202220474686.8 (CN), filed on Mar. 7, 2022.
Prior Publication US 2023/0280521 A1, Sep. 7, 2023
Int. Cl. F21V 8/00 (2006.01)
CPC G02B 6/0043 (2013.01) [G02B 6/0053 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A light source module, comprising:
a light guide plate, having a light-incident surface, a light-emitting surface and a bottom surface, wherein the light-emitting surface is opposite to the bottom surface, the light-incident surface is connected to the light-emitting surface and the bottom surface, at least one of the light-emitting surface and the bottom surface has a plurality of first strip-shaped microstructures, the first strip-shaped microstructures extend from the light-incident surface in a first extension direction away from the light-incident surface and are arranged in a first arrangement direction, the first extension direction is not parallel to the first arrangement direction, the bottom surface has a plurality of bottom microstructures, each of the bottom microstructures has a first surface facing the light-incident surface, and an acute angle between the first surface and the bottom surface ranges from 1° to 17°;
a light-emitting element, disposed opposite to the light-incident surface of the light guide plate and configured to emit a light;
a first prism sheet, disposed beside the light-emitting surface, wherein the first prism sheet comprises a plurality of first prism rods disposed on a side of the first prism sheet facing away from the light-emitting surface, the first prism rods extend in a second extension direction, and an angle between the second extension direction and the light-incident surface ranges from 0° to 30°; and
a second prism sheet, disposed beside the light-emitting surface, wherein the first prism sheet is further disposed between the light-emitting surface and the second prism sheet, the second prism sheet comprises a plurality of second prism rods disposed on a side of the second prism sheet facing away from the light-emitting surface, the second prism rods extend in a third extension direction, and an angle between the third extension direction and the light-incident surface ranges from 0° to 30°,
wherein a ratio of a height of the first strip-shaped microstructure in a direction perpendicular to the light-emitting surface to a width of the first strip-shaped microstructure in a direction parallel to the first arrangement direction is greater than or equal to 0.2, a light-emitting distribution of the light emitted from the light-emitting surface of the light guide plate has a maximum luminance direction, an angle between the maximum luminance direction and the normal direction of the light-emitting surface of the light guide plate is less than 70°, the light emitted from the second prism sheet has a backlight light-emitting distribution, the backlight light-emitting distribution has a light-emitting angle range in a direction perpendicular to the light-incident surface, and the light-emitting angle range is less than 40°.