US 11,899,312 B2
Display apparatus having back-light unit and liquid crystal panel
Jae Yeong Choi, Daegu (KR); Joon Ho Lee, Daegu (KR); and Dae Yun Im, Paju-si (KR)
Assigned to LG DISPLAY CO., LTD., Seoul (KR)
Filed by LG DISPLAY CO., LTD., Seoul (KR)
Filed on Dec. 13, 2021, as Appl. No. 17/549,265.
Claims priority of application No. 10-2020-0186518 (KR), filed on Dec. 29, 2020.
Prior Publication US 2022/0206335 A1, Jun. 30, 2022
Int. Cl. G02F 1/13357 (2006.01); G02F 1/1335 (2006.01); G02F 1/1675 (2019.01); G02F 1/13 (2006.01); G02F 1/153 (2006.01)
CPC G02F 1/133615 (2013.01) [G02F 1/1323 (2013.01); G02F 1/133512 (2013.01); G02F 1/133524 (2013.01); G02F 1/153 (2013.01); G02F 1/1675 (2019.01); G02F 2201/44 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A display apparatus comprising:
a liquid crystal panel disposed on a back-light unit; and
a viewing angle control unit disposed between the back-light unit and the liquid crystal panel,
wherein the viewing angle control unit includes light-blocking patterns having a light-blocking material and variable patterns disposed between a first control electrode and a second control electrode,
wherein the variable patterns are extended in a direction perpendicular to the light-blocking patterns,
wherein transmittance of each variable pattern is changed according to a voltage applied to the first control electrode and the second control electrode,
wherein the back-light unit includes a light-guide plate and a light-source element,
wherein the light-guide plate includes a second side perpendicular to a first side, a third side opposite to the second side, and a fourth side opposite to the first side,
wherein the light-source element includes a first light-source device on the first side of the light-guide plate, a second light-source device on the second side of the light-guide plate, and a third light-source device on the third side of the light-guide plate,
wherein the first side of the light-guide plate extends in a same direction as the light-blocking patterns, and
wherein the operation of the second light-source device on the second side of the light-guide plate, and the operation the third light-source device on the third side of the light-guide plate are controlled according to the transmittance of each variable pattern.