公开(公告)号：US12259615B2

公开(公告)日：2025-03-25

申请号：US18658856

申请日：2024-05-08

Applicant: Sharp Display Technology Corporation

Inventor： Satsuki Hagihara ,  Kazuhiko Negoro ,  Mayumi Hori ,  Kenichi Iwamoto

IPC: G02F1/1335 ,  G02F1/13357

Abstract: A backlight apparatus includes an LED substrate having a principal surface over which a plurality of light-emitting elements that emit excitation light are arrayed, a phosphor layer containing a phosphor that emits fluorescence upon receiving the excitation light, a wavelength-selective reflecting layer disposed between the phosphor layer and the LED substrate, and a louver film disposed between the wavelength-selective reflecting layer and the LED substrate and having a plurality of louvers. The wavelength-selective reflecting layer has different transmittances according to wavelengths and/or angles of incidence of light falling thereon. The louver film blocks the fluorescence and the excitation light falling thereon at an angle greater than or equal to a first angle and smaller than 90 degrees with respect to a direction normal to a film surface of the louver film.

公开(公告)号：US11947216B2

公开(公告)日：2024-04-02

申请号：US18205266

申请日：2023-06-02

Applicant: Sharp Display Technology Corporation

Inventor： Kenichi Iwamoto ,  Satsuki Hagihara ,  Kazuhiko Negoro

IPC: G02F1/13357 ,  G02F1/1335

CPC classification number: G02F1/133603 ,  G02F1/133605 ,  G02F1/133607 ,  G02F1/133608 ,  G02F1/133614

Abstract: A backlight apparatus includes a light source emitting blue light, a light guide layer, a quantum dot phosphor layer, a reflective layer, and a yellow phosphor layer. The light guide layer includes a first main surface, a second main surface, at least one light-receiving side surface, and at least one non-light-receiving side surface. The quantum dot phosphor layer is provided on the first main surface side of the light guide layer and includes a red quantum dot phosphor and a green quantum dot phosphor. The reflective layer is disposed on the second main surface side of the light guide layer. The yellow phosphor layer is provided between the second main surface and the reflective layer and in a region along the at least one non-light-receiving side surface, and includes a yellow phosphor. The quantum dot phosphor layer is in contact with the first main surface.