US 12,449,705 B2
Viewing angle control film and display device comprising the same
Sunbok Song, Paju-si (KR); Taehyung Kim, Paju-si (KR); and Kyuoh Kwon, Paju-si (KR)
Assigned to LG DISPLAY CO., LTD., Seoul (KR)
Filed by LG Display Co., Ltd., Seoul (KR)
Filed on Oct. 28, 2022, as Appl. No. 17/976,611.
Claims priority of application No. 10-2021-0187284 (KR), filed on Dec. 24, 2021.
Prior Publication US 2023/0205029 A1, Jun. 29, 2023
Int. Cl. G02F 1/137 (2006.01); G02F 1/155 (2006.01); G02F 1/163 (2006.01)
CPC G02F 1/137 (2013.01) [G02F 1/155 (2013.01); G02F 1/163 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A viewing angle control film comprising:
a first electrode;
a second electrode spaced apart from and facing the first electrode;
a light conversion layer disposed between the first electrode and the second electrode; and
a control unit configured to adjust a viewing angle of the light conversion layer by adjusting a voltage applied between the first electrode and the second electrode,
wherein the light conversion layer comprises:
a plurality of partition walls disposed to be spaced apart between the first electrode and the second electrode;
a plurality of containing portions disposed between partition walls and disposed with predetermined gaps along the first electrode; and
dispersion liquid, light blocking particles and liquid crystals disposed in each of the plurality of containing portions,
wherein the control unit is configured to apply a pulse voltage that swings between a positive signed first voltage and a second voltage having a same magnitude as a magnitude of the first voltage and a polarity opposite to a polarity of the first voltage, and adjust a duty cycle, which is a proportion occupied by an interval of the first voltage, in each drive mode, and
wherein a private mode having a narrow viewing angle and a share mode having a wide viewing angle are included, and the control unit applies the pulse voltage in the share mode.