Patent ID: 11947216
Assignee: SHARP DISPLAY TECHNOLOGY CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A backlight apparatus comprising:
a light source configured to emit blue light;
a light guide layer including a first main surface, a second main surface on a side opposite to the first main surface, at least one light-receiving side surface intersecting the first and second main surfaces and receiving the blue light emitted from the light source, and at least one non-light-receiving side surface intersecting the first and second main surfaces and not receiving the blue light;
a quantum dot phosphor layer provided on the first main surface side of the light guide layer, the quantum dot phosphor layer including a red quantum dot phosphor receiving the blue light and emitting red light and a green quantum dot phosphor receiving the blue light and emitting green light;
a reflective layer disposed on the second main surface side of the light guide layer; and
a yellow phosphor layer provided between the second main surface of the light guide layer and the reflective layer and in a region along the at least one non-light-receiving side surface when viewed from a normal direction of the first main surface, the yellow phosphor layer including a yellow phosphor receiving the blue light and emitting yellow light,
wherein the quantum dot phosphor layer is in contact with the first main surface of the light guide layer.