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.