公开(公告)号：US11231616B2

公开(公告)日：2022-01-25

申请号：US16916885

申请日：2020-06-30

Applicant: LG Display Co., Ltd.

Inventor： KiSeong Kim ,  HyeokJoon Yoon

IPC: G02F1/13357 ,  G02F1/1335

Abstract: The present disclosure relates to a color conversion sheet, a backlight unit, and a display device, in which a reflection filter exhibiting transflection with respect to blue light may be disposed on a color conversion layer that excites blue light and then emits green light and red light and in which a reflection filter exhibiting total reflection of green light and red light may be disposed under the color conversion layer, thereby increasing the probability of exciting blue light and the amount of green light and red light emitted forwards, so that the efficiency of the color conversion sheet can be improved. In addition, it is possible to prevent a halo caused by the diffusion of light scattered backwards and to increase the brightness provided by the backlight unit by causing the light scattered backwards to be reflected forwards from the position adjacent to the color conversion layer.

公开(公告)号：US11112652B2

公开(公告)日：2021-09-07

申请号：US16702473

申请日：2019-12-03

Applicant: LG Display Co., Ltd.

Inventor： Donghwi Kim ,  KiSeong Kim ,  HyeokJoon Yoon ,  SeungJu Gwon

IPC: G02F1/13357 ,  G02F1/1335

Abstract: In an embodiment, a backlight unit includes a light-emitting device and lower reflector on a substrate. The lower reflector has a hole that accommodates and exposes the light-emitting device. The lower reflector may have a height greater than a height of the light-emitting device. The backlight unit may include a color resin in the holes and on the light-emitting device. The backlight unit may include a light path modulator above the light emitting device and on the color resin. The light path modulator may have a different refractive index than a refractive index of the color resin to reflect the emitted light at a boundary of the light path modulator and the color resin towards the lower reflector.

公开(公告)号：US11662624B2

公开(公告)日：2023-05-30

申请号：US17575522

申请日：2022-01-13

Applicant: LG Display Co., Ltd.

Inventor： HyeokJoon Yoon ,  KiSeong Kim

IPC: G02F1/00 ,  G02F1/13357

CPC classification number: G02F1/133605 ,  G02F1/133603

Abstract: Embodiments of the present disclosure include a backlight unit and a display device using the backlight unit comprising a plurality of light emitting elements disposed on a substrate and each having a flip chip structure. A reflector is disposed between the plurality of light emitting elements and includes a plurality of grooves each having a predetermined size on an upper surface of the reflector. A transparent sheet is disposed on the reflector and the plurality of light emitting elements and includes a plurality of optical path changing patterns disposed at positions overlapping the plurality of light emitting elements on an opposite side of a surface of the transparent sheet adjacent to the plurality of light emitting elements and each having a central region thicker than an outer region.

公开(公告)号：US10948645B2

公开(公告)日：2021-03-16

申请号：US16706341

申请日：2019-12-06

Applicant: LG Display Co., Ltd.

Inventor： HyeokJoon Yoon ,  KiSeong Kim ,  SeungJu Gwon ,  Donghwi Kim

IPC: F21V8/00 ,  G02F1/13357 ,  G02F1/1333 ,  G02F1/1335

Abstract: In an embodiment, a display device comprises a display panel and a backlight unit. The backlight unit comprises a substrate, phosphor film, light-emitting devices, and light-modifying portion. A part of light emitted by the light-emitting devices traveling along a first path that passes through the phosphor film and another part of the emitted light traveling along a second path that bypasses the phosphor film. The light-modifying portion is in the second path and modifies a color of the other part of the emitted light so that the modified color is closer to a color of the part of the light through the phosphor film than a color of the emitted light at the light-emitting devices.

公开(公告)号：US11256134B2

公开(公告)日：2022-02-22

申请号：US17122851

申请日：2020-12-15

Applicant: LG Display Co., Ltd.

Inventor： HyeokJoon Yoon ,  KiSeong Kim

IPC: G02F1/00 ,  G02F1/13357

Abstract: Embodiments of the present disclosure include a backlight unit and a display device using the backlight unit comprising a plurality of light emitting elements disposed on a substrate and each having a flip chip structure. A reflector is disposed between the plurality of light emitting elements and includes a plurality of grooves each having a predetermined size on an upper surface of the reflector. A transparent sheet is disposed on the reflector and the plurality of light emitting elements and includes a plurality of optical path changing patterns disposed at positions overlapping the plurality of light emitting elements on an opposite side of a surface of the transparent sheet adjacent to the plurality of light emitting elements and each having a central region thicker than an outer region.

公开(公告)号：US10989961B2

公开(公告)日：2021-04-27

申请号：US16696923

申请日：2019-11-26

Applicant: LG Display Co., Ltd.

Inventor： KiSeong Kim ,  HyeokJoon Yoon ,  SeungJu Gwon ,  Donghwi Kim

IPC: G02F1/13357 ,  G02F1/1335

Abstract: In an embodiment, a display device comprises a display panel and a backlight unit. The backlight unit comprises a printed circuit, a light-emitting device on the printed circuit, and a transparent film including a holographic film. The holographic film includes at least an optical pattern overlapping the light-emitting device and modifying angle of a portion of light emitted by the light-emitting device. The backlight unit further comprises a light output pattern, where the portion of light with the modified angle passes through the light output pattern toward the display panel. The light output pattern may have a refractive index greater than a refractive index of the transparent film such that a refraction angle of the portion of light exiting the light output pattern is less than the incidence angle of the portion of light entering the light output pattern.

公开(公告)号：US11640082B2

公开(公告)日：2023-05-02

申请号：US17468099

申请日：2021-09-07

Applicant: LG DISPLAY CO., LTD.

Inventor： KiSeong Kim

IPC: G02F1/1335 ,  G02F1/13357

Abstract: A backlight unit and a display device includes a plurality of light sources and a color conversion layer on a reflective layer, thereby removing expensive color conversion sheets and supplying high-quality white light. A backlight unit includes a printed circuit; light sources on the printed circuit; a reflective layer on at least a partial area of an area in which the light sources are not disposed on the printed circuit; a transparent film above the light sources and the reflective layer and spaced apart from the light sources and the reflective layer; light diffusion patterns on at least one of the top and bottom of the transparent film and corresponding to each of the light sources; a first color conversion layer on the reflective layer; and a second color conversion layer on at least one of a top surface and a bottom surface of the light diffusion patterns.

公开(公告)号：US20220137460A1

公开(公告)日：2022-05-05

申请号：US17575522

申请日：2022-01-13

Applicant: LG Display Co., Ltd.

Inventor： HyeokJoon YOON ,  KiSeong Kim

IPC: G02F1/13357

Abstract: Embodiments of the present disclosure include a backlight unit and a display device using the backlight unit comprising a plurality of light emitting elements disposed on a substrate and each having a flip chip structure. A reflector is disposed between the plurality of light emitting elements and includes a plurality of grooves each having a predetermined size on an upper surface of the reflector. A transparent sheet is disposed on the reflector and the plurality of light emitting elements and includes a plurality of optical path changing patterns disposed at positions overlapping the plurality of light emitting elements on an opposite side of a surface of the transparent sheet adjacent to the plurality of light emitting elements and each having a central region thicker than an outer region.

公开(公告)号：US20210200030A1

公开(公告)日：2021-07-01

申请号：US17122851

申请日：2020-12-15

Applicant: LG Display Co., Ltd.

Inventor： HyeokJoon YOON ,  KiSeong Kim

IPC: G02F1/13357

Abstract: Embodiments of the present disclosure include a backlight unit and a display device using the backlight unit comprising a plurality of light emitting elements disposed on a substrate and each having a flip chip structure. A reflector is disposed between the plurality of light emitting elements and includes a plurality of grooves each having a predetermined size on an upper surface of the reflector. A transparent sheet is disposed on the reflector and the plurality of light emitting elements and includes a plurality of optical path changing patterns disposed at positions overlapping the plurality of light emitting elements on an opposite side of a surface of the transparent sheet adjacent to the plurality of light emitting elements and each having a central region thicker than an outer region.