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

Claim 7:
8. A display apparatus comprising:
a back-light unit, the back-light unit includes a light-guide plate and a light-source element;
a viewing angle control unit disposed on the back-light unit; and
a liquid crystal panel disposed on the viewing angle control unit,
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, and
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 viewing angle control unit includes light-blocking patterns extended in a first direction same as the first side of the light-guide plate, and a first variable patterns extended in a second direction perpendicular to the first direction,
wherein the first variable patterns are disposed between a first control electrode and a second control electrode,
wherein each of the first variable patterns includes an electrochromic material, 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 transmittance of each of the first variable patterns.