US 12,222,534 B1
Optical film
Byeonghun Lee, Pyeongtaek-si (KR); Hyeonuk Park, Pyeongtaek-si (KR); Dongkyu Lee, Pyeongtaek-si (KR); and Changgoo Park, Pyeongtaek-si (KR)
Assigned to LMS Co., Ltd., Pyeongtaek-si (KR)
Filed by LMS Co., Ltd., Pyeongtaek-si (KR)
Filed on Apr. 30, 2024, as Appl. No. 18/650,132.
Claims priority of application No. 10-2024-0011197 (KR), filed on Jan. 24, 2024.
Int. Cl. F21V 8/00 (2006.01)
CPC G02B 6/0051 (2013.01) [G02B 6/0053 (2013.01)] 20 Claims
OG exemplary drawing
 
11. A backlight unit comprising:
an edge type light source; and
an optical film disposed over the light source further comprising:
a first optical sheet including a first base portion;
a pyramid pattern layer including a plurality of pyramid patterns formed on a first surface of the first base portion and a first side of a pyramid base of the pyramid pattern arranged in a pyramid direction; and
a first prism pattern layer including a plurality of first prism patterns formed on a second surface of the first base portion and an edge of the first prism pattern arranged in a first prism direction,
wherein the optical film satisfies either Equation 5 or Equation 6:

OG Complex Work Unit Math
wherein pi1 is a first pitch corresponding to a length of the first side of the pyramid base of the pyramid pattern; pi1-1 is a first prime pitch corresponding to a diagonal length of the pyramid base of the pyramid pattern; pi2 is a second pitch corresponding to a base length of the first prism pattern; and n is a natural number.