Partial drive-type light source device and image display device using same

Patent metadata

Field	Value
Publication number	US-10690961-B2
Application number	US-201916535402-A
Country	US
Kind code	B2
Filing date	Aug 8, 2019
Priority date	Oct 23, 2015
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

Provided is a partial drive-type light source device including an excitation light source that is formed from a plurality of light-emitting elements and is partially drivable, a phosphor sheet disposed at a position separated from the excitation light source and containing a phosphor that converts at least part of a wavelength region of incident light from the excitation light source and releases emitted light in a wavelength region differing from the incident light, and a wavelength-selective reflection film that is disposed between the excitation light source and the phosphor sheet and that transmits at least part of light in the wavelength region of the incident light from the excitation light source and reflects at least part of light in the wavelength region of the emitted light from the phosphor sheet.

First claim

The invention claimed is:

1. A partial drive-type light source device comprising:
an excitation light source that is formed from a plurality of light-emitting elements and is partially drivable;
a phosphor sheet disposed at a position separated from the excitation light source and containing a phosphor that converts at least part of a wavelength region of incident light from the excitation light source and releases emitted light in a wavelength region differing from the incident light; and
a wavelength-selective reflection film that is disposed between the excitation light source and the phosphor sheet and that transmits at least part of light in the wavelength region of the incident light from the excitation light source and reflects at least part of light in the wavelength region of the emitted light from the phosphor sheet, wherein
the phosphor sheet includes a phosphor layer and a protective film for protecting the phosphor layer, the phosphor layer being formed from a resin composition including the phosphor,
the phosphor sheet and the wavelength-selective reflection film are in an integrated form to configure an integrated sheet, and
in the integrated sheet, the protective film is disposed at one side of the phosphor layer, and the phosphor layer and the wavelength-selective reflection film are directly joined at the opposite side of the phosphor layer.

2. The partial drive-type light source device according to claim 1 , wherein
the plurality of light-emitting elements of the excitation light source is in a grid-shaped array.

3. The partial drive-type light source device according to claim 1 , wherein
the light-emitting elements are blue LEDs.

4. The partial drive-type light source device according to claim 3 , wherein the wavelength-selective reflection film transmits at least part of a light emission wavelength region of the blue LEDs and reflects at least part of light in a wavelength region from green to red.

5. The partial drive-type light source device according to claim 1 , wherein
the light-emitting elements are magenta LEDs.

6. The partial drive-type light source device according to claim 5 , wherein
the magenta LEDs are each formed from a blue LED and a red phosphor disposed on a chip upper surface of the blue LED.

7. The partial drive-type light source device according to claim 6 , wherein
the red phosphor is a fluoride red light-emitting phosphor.

8. The partial drive-type light source device according to claim 7 , wherein
the fluoride red light-emitting phosphor is K 2 SiF 6.

9. The partial drive-type light source device according to claim 5 , wherein
the wavelength-selective reflection film transmits at least part of a light emission wavelength region of the magenta LEDs and reflects at least part of light in a green wavelength region.

10. The partial drive-type light source device according to claim 1 , wherein
the phosphor of the phosphor sheet is a sulfide phosphor.

11. The partial drive-type light source device according to claim 10 , wherein
the sulfide phosphor includes either or both of a red sulfide phosphor and a green sulfide phosphor.

12. The partial drive-type light source device according to claim 11 , wherein
the red sulfide phosphor is a calcium sulfide phosphor and the green sulfide phosphor is a thiogallate phosphor.

13. The partial drive-type light source device according to claim 1 , wherein
the phosphor of the phosphor sheet is an yttrium cerium aluminum garnet phosphor.

14. An image display device comprising the partial drive-type light source device according to claim 1 .

Assignees

• Dexerials Corp

Inventors

• Kishimoto Koichi
• Ito Yasushi
• Hori Tomomitsu
• Sato Noritaka

Classifications

• H10W90/00

  Package configurations · CPC title

• G02F2203/09

  transflective · CPC title

• G02F1/133609

  including means for improving the color mixing, e.g. white · CPC title

• G02F1/133606

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02F1/133605 Primary

  including specially adapted reflectors · CPC title