US 12,222,601 B2
Display apparatus
Daesik Kim, Suwon-si (KR); Yasuhiro Nishida, Suwon-si (KR); Kyonghyong Kim, Suwon-si (KR); and Jongil Kim, Suwon-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Jan. 31, 2023, as Appl. No. 18/103,933.
Application 18/103,933 is a continuation of application No. PCT/KR2023/000484, filed on Jan. 11, 2023.
Claims priority of application No. 10-2022-0042296 (KR), filed on Apr. 5, 2022.
Prior Publication US 2023/0314874 A1, Oct. 5, 2023
Int. Cl. G02F 1/1335 (2006.01); G02F 1/13357 (2006.01)
CPC G02F 1/133607 (2021.01) [G02F 1/133603 (2013.01); G02F 1/133605 (2013.01); G02F 1/133608 (2013.01); G02F 1/133614 (2021.01); G02F 1/133617 (2013.01); G02F 2202/36 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A display apparatus comprising:
a liquid crystal panel; and
a backlight unit configured to provide light to the liquid crystal panel,
wherein the backlight unit comprises:
a substrate;
a light emitting diode provided on the substrate;
a quantum dot cover covering the light emitting diode and configured to convert a wavelength of light emitted from the light emitting diode;
a refractive cover covering the quantum dot cover, wherein a surface of the refractive cover has a recessed portion that is recessed toward the quantum dot cover; and
a reflector provided in the recessed portion to be positioned above the quantum dot cover,
wherein a diameter of a lower surface of the reflector is smaller than a diameter of an upper surface of the reflector,
wherein the lower surface of the reflector is upwardly convex such that the light emitted from the light emitting diode with an angle higher than an upper limit of a beam angle profile of the light is reflected from the lower surface of the reflector, and the light reflected from the lower surface of the reflector is reflected again by a lower reflector, and
wherein the beam angle profile of the light is changed in accordance with a change of a linear distance between a center portion of the lower surface of the reflector and a center portion of an upper surface of the quantum dot cover.