公开(公告)号：US20240255799A1

公开(公告)日：2024-08-01

申请号：US18422043

申请日：2024-01-25

Applicant: Japan Display Inc.

Inventor： Toshihiro YAJIMA ,  Takashi OTA ,  Michihide SHIBATA

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

CPC classification number: G02F1/133603 ,  H01L25/0753 ,  H01L33/504

Abstract: The present invention has been made to reduce a yellow shift around blue LEDs in a backlight including the blue LEDs and a color conversion sheet. Provided is a backlight including a light source including blue LEDs arranged in a matrix, on a plane, at first intervals, and a color conversion sheet arranged to cover the light source, in which red quantum dots that emit red light in response to blue light and green quantum dots that emit green light in response to blue light are dispersed in the color conversion sheet, short-wavelength LEDs that emit light of a shorter wavelength than that of blue light are arranged near the blue LEDs, and blue quantum dots that emit blue light in response to the short-wavelength light are arranged in the color conversion sheet, at positions overlapping the short-wavelength LEDs in plan view.

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：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：US20210181402A1

公开(公告)日：2021-06-17

申请号：US17184665

申请日：2021-02-25

Applicant: Japan Display Inc.

Inventor： Takashi OTA ,  Kazutaka NAGAOKA ,  Michihide SHIBATA ,  Toshihiro YAJIMA

IPC: F21V8/00 ,  H04N5/225

Abstract: According to one embodiment, an electronic device includes a liquid crystal panel and an illumination unit which illuminates the liquid crystal panel. The illumination unit includes a light guide comprising a first side surface, a main surface opposing the liquid crystal panel and an opening made by a notch or a through hole, a first light source opposing to the first side surface, and a second light source provided closer to the opening than to the first light source.

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：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.