公开(公告)号：US20240421265A1

公开(公告)日：2024-12-19

申请号：US18673352

申请日：2024-05-24

Applicant: Japan Display Inc.

Inventor： Toshihiro YAJIMA ,  Michihide SHIBATA ,  Takashi OTA

IPC: H01L33/50 ,  G02F1/13357 ,  H01L25/075

Abstract: The purpose is to reduce a color shift around an ultraviolet LED in a backlight using the ultraviolet LED and a QD sheet, viewed in a plane. The structure is: A display device having a display panel and a backlight, the backlight including a light source in which ultraviolet LEDs are arranged in a plane and in a matrix with a first interval, and a QD sheet covering the light source; the QD sheet being dispersed with red quantum dots, green quantum dots, and blue quantum dots, emitting light in response to ultraviolet light, the QD sheet having a first region and a second region arranged in a ring shape to surround the ultraviolet LED in a plan view, more of the red quantum dots, the green quantum dots, or the blue quantum dots being dispersed in the second region than in the first region.

公开(公告)号：US20240418925A1

公开(公告)日：2024-12-19

申请号：US18679541

申请日：2024-05-31

Applicant: Japan Display Inc.

Inventor： Takashi OTA ,  Nobuyuki SUZUKI ,  Shinichi KOMURA ,  Hiroaki KIJIMA ,  Koichi OKUDA

IPC: F21V8/00 ,  G02F1/13357

Abstract: A backlight includes: a light guide plate including a front surface and a back surface, the light guide plate including an end face that connects one edge of the front surface and one edge of the back surface, at least part of the end face being inclined at an angle other than a right angle relative to the front surface; and a light source that emits light, the light source being set in an arrangement enabling emission of the light parallel to the front surface towards the at least part of the end face of the light guide plate, wherein the light is incident on and refracted at the at least part of the end face, propagates inside a material of the light guide plate, is reflected off the back surface, and is surface-emitted from the front surface.

公开(公告)号：US20250102862A1

公开(公告)日：2025-03-27

申请号：US18975169

申请日：2024-12-10

Applicant: Japan Display Inc.

Inventor： Toshihiro YAJIMA ,  Michihide SHIBATA ,  Takashi OTA

IPC: G02F1/13357

Abstract: The objective is to reduce yellow shift around a blue LED in a backlight using the blue LED and a color conversion sheet. To solve this problem, one of the structures of invention is: a display device including a display panel and a backlight, the backlight having a plurality of LEDs arranged on a substrate and a color conversion sheet arranged between the plurality of LEDs and the display panel, the color conversion sheet being formed of color conversion material and a binder, the color conversion sheet having a ring-shaped area without the color conversion material, the ring-shaped area surrounding each of the plurality of LEDs in a plan view.

公开(公告)号：US20220404670A1

公开(公告)日：2022-12-22

申请号：US17894249

申请日：2022-08-24

Applicant: Japan Display Inc.

Inventor： Takashi OTA

IPC: G02F1/13357 ,  G02F1/1335

Abstract: According to one embodiment, an illumination device comprises a plurality of light emitting elements that are disposed on a main surface of a wiring board, a light diffusion distance maintaining layer, a wavelength conversion layer, and a prism sheet, wherein the main surface of the wiring board is divided into a plurality of segment regions, n (n>1) light emitting elements are provided in each of the segment regions, the light emitting elements are independently driven in units of the segment regions, and a thickness of the light diffusion distance maintaining layer is ½ times or more a pitch of the segment regions adjacent to each other.

公开(公告)号：US20220137281A1

公开(公告)日：2022-05-05

申请号：US17504931

申请日：2021-10-19

Applicant: Japan Display Inc.

Inventor： Takashi OTA

IPC: F21V8/00 ,  G02F1/1335

Abstract: The purpose of the present invention is to realize a display device of high definition and high contrast by applying an accurate local dimming. The structure of the invention is as follows. A display device including: a display panel and a back light; in which the back light includes a light source and optical sheet group; the light source includes the light source substrate and LEDs disposed on the light source substrate; the light source is divided into segments in a plan view; at least one of the LEDs is disposed in a segment; the light source substrate, except the LEDs, is covered by a protective film; the segment is partitioned as by wall with the partition plate made of resin; the partition plate is disposed on the protective film.

公开(公告)号：US20240288731A1

公开(公告)日：2024-08-29

申请号：US18437359

申请日：2024-02-09

Applicant: Japan Display Inc.

Inventor： Toshihiro YAJIMA ,  Michihide SHIBATA ,  Takashi OTA

IPC: G02F1/1335 ,  G02F1/13357

CPC classification number: G02F1/133614 ,  G02F1/133603 ,  G02F1/133605

Abstract: A backlight includes a light source in which blue LEDs are planarly arranged in a matrix with a first interval, and a color conversion sheet disposed covering the light source. First red quantum dots that receive blue light and emit red light, and first green quantum dots that receive blue light and emit green light are dispersed in the color conversion sheet. An RG quantum dot layer, in which second red quantum dots that receive blue light and emit red light and second green quantum dots that receive blue light and emit green light are dispersed, is disposed around each of the blue LEDs in planar view.

公开(公告)号：US20230266620A1

公开(公告)日：2023-08-24

申请号：US18309837

申请日：2023-05-01

Applicant: Japan Display Inc.

Inventor： Takashi OTA ,  Michihide SHIBATA

IPC: G02F1/13357 ,  G02F1/1335

CPC classification number: G02F1/133603 ,  G02F1/133607

Abstract: The purpose of the present invention is to realize a display device of high definition and high contrast by applying an accurate local dimming. The structure of the invention is as follows. A display device including: a display panel and a back light, in which the back light includes a light source and an optical sheet group, the light source includes a light source substrate and LEDs disposed on the light source substrate, the light source is divided into segments in a plan view, at least one of the LEDs is disposed in a segment, the light source substrate and the LEDs are covered by a transparent resin, and a groove like gap is formed in the transparent resin along a border between the segments.

公开(公告)号：US20220066266A1

公开(公告)日：2022-03-03

申请号：US17454642

申请日：2021-11-12

Applicant: Japan Display Inc.

Inventor： Takashi OTA ,  Masafumi OKADA ,  Toshihiro YAJIMA

IPC: G02F1/13357 ,  G02F1/1335

Abstract: According to one embodiment, an illuminating device includes a wiring substrate, light emitting elements, a wavelength conversion element, and a protrusion. A main surface of the wiring substrate is divided into segment areas. N light emitting elements are disposed in each of the segment areas. N is greater than 1. The light emitting elements are driven independently in units of the segment areas. The protrusion protrudes from the wiring substrate toward the wavelength conversion element between two segment areas adjacent to each other.

公开(公告)号：US20190094454A1

公开(公告)日：2019-03-28

申请号：US16142837

申请日：2018-09-26

Applicant: Japan Display Inc.

Inventor： Toji AOSHIMA ,  Shiori AKAMATSU ,  Takashi OTA ,  Tomohisa ONISHI

IPC: F21V8/00

CPC classification number: G02B6/0086 ,  G02B6/0051 ,  G02B6/0055 ,  G02B6/0083 ,  G02B6/009

Abstract: According to one embodiment, an illumination device includes a light guide, a frame surrounding the light guide, a light emitting unit located between the light guide and the frame, and a wiring substrate electrically connected to the light emitting unit. The wiring substrate includes a convex portion projecting in a first direction as seen in plan view. The frame includes a concave portion facing the convex portion as seen in plan view. The concave portion is spaced apart from the convex portion.

公开(公告)号：US20250110370A1

公开(公告)日：2025-04-03

申请号：US18888357

申请日：2024-09-18

Applicant: Japan Display Inc.

Inventor： Takashi OTA ,  Michihide SHIBATA ,  Toshihiro YAJIMA

IPC: G02F1/13357 ,  G02F1/1335

Abstract: A task of the present invention is to realize a display device with high definition and high contrast by means of local dimming. The configuration is as follows. A liquid crystal display device including a display panel and a back light, the back light having a light source and a group of optical sheets, the light source including a light source substrate and LEDs arranged on the light source substrate, the light source being divided into segments in a plan view, the segment including at least one LED, characterized in that the segment is surrounded by a stacked structure of a lower reflection wall and an upper reflection wall.