Invention Grant
- Patent Title: Lighting device and method of producing light source substrate
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Application No.: US17085418Application Date: 2020-10-30
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Publication No.: US11804580B2Publication Date: 2023-10-31
- Inventor: Hisashi Watanabe , Hirotoshi Yasunaga , Youzou Kyoukane , Takeshi Masuda
- Applicant: SHARP KABUSHIKI KAISHA
- Applicant Address: JP Sakai
- Assignee: SHARP KABUSHIKI KAISHA
- Current Assignee: SHARP KABUSHIKI KAISHA
- Current Assignee Address: JP Sakai
- Agency: ScienBiziP, P.C.
- Main IPC: H01L33/50
- IPC: H01L33/50 ; H01L33/00 ; H01L33/60 ; H01L33/02 ; G02F1/13357 ; G02F1/1335 ; H01L25/075 ; H01L33/54 ; H01L33/46 ; H01L33/62

Abstract:
A lighting device includes a circuit substrate that includes a wiring circuit, LEDs that are mounted on the circuit substrate and that emit primary light, a phosphor sheet that faces a light emission surface of each of the LEDs and that has a function of converting part of the primary light into secondary light in another wavelength range that differs from the wavelength range, and a selective reflection layer that is composed of dielectric multilayer film, that is disposed between the phosphor sheet and the LEDs, that covers the light emission surface of each of the LEDs, that allows the part of the primary light to be transmitted therethrough, and that reflects part of the secondary light. The selective reflection layer is disposed so as to have convex shapes projecting in a direction opposite a direction toward the circuit substrate in regions that overlap the LEDs.
Public/Granted literature
- US20210135066A1 LIGHTING DEVICE AND METHOD OF PRODUCING LIGHT SOURCE SUBSTRATE Public/Granted day:2021-05-06
Information query
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