US 11,693,274 B2
Backlight module and display apparatus
Kuan-Wen Liu, Hsinchu County (TW); Hao-Jan Kuo, Hsinchu County (TW); Ming-Yu Chou, Hsinchu County (TW); and Hsin Huang, Hsinchu County (TW)
Assigned to Nano Precision Taiwan Limited, Hsinchu County (TW)
Filed by Nano Precision Taiwan Limited, Hsinchu County (TW)
Filed on Jan. 26, 2022, as Appl. No. 17/584,388.
Claims priority of application No. 202120383263.0 (CN), filed on Feb. 20, 2021; and application No. 202121547426.0 (CN), filed on Jul. 8, 2021.
Prior Publication US 2022/0269132 A1, Aug. 25, 2022
Int. Cl. G02F 1/13357 (2006.01); G02F 1/1335 (2006.01); F21V 8/00 (2006.01)
CPC G02F 1/133607 (2021.01) [G02B 6/0053 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A backlight module, comprising a light guide plate, a light source, an optical film, and a prism sheet, wherein
the light guide plate has a light incident surface and a light emitting surface connected to the light incident surface;
the light source is disposed on a side of the light incident surface of the light guide plate;
the optical film is overlapped with the light emitting surface of the light guide plate, and comprises a first substrate and a plurality of optical microstructures, wherein
the first substrate has a first surface and a second surface opposite to each other, wherein the first surface faces the light emitting surface of the light guide plate; and
the plurality of optical microstructures are disposed on the second surface of the first substrate, an extension direction of the plurality of optical microstructures is parallel to the light incident surface of the light guide plate, and each of the plurality of optical microstructures has a fifth surface away from the light incident surface, wherein a first angle is present between the fifth surface and the second surface; and
the prism sheet is overlapped with the optical film, is located on a side of the second surface of the first substrate, and comprises a second substrate and a plurality of prism structures, wherein
the second substrate has a third surface and a fourth surface opposite to each other, wherein the third surface faces the optical film; and
the plurality of prism structures are disposed on the fourth surface of the second substrate, an extension direction of the plurality of prism structures is parallel to the light incident surface of the light guide plate, and each of the plurality of prism structures has a sixth surface away from the light incident surface, wherein a second angle is present between the sixth surface and the fourth surface, the second angle is different from the first angle, and the first angle is less than 35 degrees and greater than 0 degrees.