Patent ID: 11899312
Assignee: LG DISPLAY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
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.