WAVELENGTH-CONVERTING DEVICE AND PROJECTION APPARATUS

• US 20200132261A1
• Filed: 10/24/2019
• Published: 04/30/2020
• Est. Priority Date: 10/29/2018
• Status: Active Grant

• Current Assignee: Coretronic Corporation
• Original Assignee: Coretronic Corporation
• Inventors: TSAI, CHIA-LUN, HSIEH, CHI-TANG
• Granted Patent: US 11,415,273 B2
• Time in Patent Office: Days
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 29/505 of reflectors
• CPC Class Codes: F21V 7/30 the coatings comprising photoluminescent substances
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: G03B 21/16 Cooling; Preventing overheating
• CPC Class Codes: G03B 21/2006 characterised by the light source
• CPC Class Codes: G03B 21/204 using secondary light emission, e.g. luminescence or fluorescence using different colours G03B33/00; if related to video signals H04N9/3197
• CPC Class Codes: G03B 21/2066 Reflectors in illumination beam in projection beam G03B21/28
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material

Abstract

A wavelength-converting device has a light incident side. The wavelength-converting device includes an inner annular portion and an annular portion. The annular portion is connected to an outer edge of the inner annular portion. The annular portion includes a wavelength-converting portion, a first heat-conductive bonding medium, a reflective layer, and a wavelength-converting layer. A groove is annularly disposed in the wavelength-converting portion, and the groove is recessed from the light incident side of the wavelength-converting device. The first heat-conductive bonding medium is disposed in the groove. The reflective layer is disposed on the first heat-conductive bonding medium. The wavelength-converting layer is disposed on the reflective layer and has a light receiving surface. A projection apparatus is also provided.

Claims

1. A wavelength-converting device having a light incident side, and the wavelength-converting device comprising an inner annular portion and an annular portion, wherein:

the annular portion is connected to an outer edge of the inner annular portion, the annular portion comprises a wavelength-converting portion, a first heat-conductive bonding medium, a reflective layer, and a wavelength-converting layer, wherein;

a groove is annularly disposed in the wavelength-converting portion, and the groove is recessed from the light incident side of the wavelength-converting device;

the first heat-conductive bonding medium is disposed in the groove;

the reflective layer is disposed on the first heat-conductive bonding medium; and

the wavelength-converting layer is disposed on the reflective layer and has a light receiving surface.

2. The wavelength-converting device according to claim 1, wherein the groove comprises a bottom surface, an inner ring wall surface and an outer ring wall surface, and the first heat-conductive bonding medium is disposed on the bottom surface.

3. The wavelength-converting device according to claim 2, further comprising an optical structure, wherein the optical structure is disposed within a range of at least one of the inner ring wall surface and the outer ring wall surface of the groove, so that the optical structure is located between the wavelength-converting layer and at least one of the inner ring wall surface and the outer ring wall surface.

4. The wavelength-converting device according to claim 3, wherein the optical structure is selected from one of a scattering layer and a reflective layer.

5. The wavelength-converting device according to claim 2, further comprising a second heat-conductive bonding medium, wherein the second heat-conductive bonding medium is disposed on at least one of the inner ring wall surface and the outer ring wall surface, so that the second heat-conductive bonding medium is located at least at one of:

(1) between the wavelength-converting layer and at least one of the inner ring wall surface and the outer ring wall surface, (2) between the reflective layer and at least one of the inner ring wall surface and the outer ring wall surface, (3) between the first heat-conductive bonding medium and at least one of the inner ring wall surface and the outer ring wall surface.

6. The wavelength-converting device according to claim 5, further comprising an optical structure, wherein the wavelength-converting layer has an inner ring edge and an outer ring edge, the optical structure is disposed at least within a range of at least one of the inner ring wall surface and the outer ring wall surface of the groove, so that the optical structure is located at least at one of:

(1) between the inner ring edge of the wavelength-converting layer and the inner ring wall of the groove, (2) between the inner ring edge of the wavelength-converting layer and the second heat-conductive bonding medium within the range of the inner ring wall surface, (3) between the outer ring edge of the wavelength-converting layer and the outer ring wall surface of the groove, (4) between the outer ring edge of the wavelength-converting layer and the second heat-conductive bonding medium within the range of the outer ring wall surface.

7. The wavelength-converting device according to claim 6, wherein the optical structure is a scattering layer or a reflective layer.

8. The wavelength-converting device according to claim 1, further comprising a third heat-conductive bonding medium, wherein the groove recessed in the wavelength-converting portion has an inner ring edge and an outer ring edge on the light incident side, the third heat-conductive bonding medium is coated along part or all of at least one of the inner ring edge and the outer ring edge of the groove, so that a radial section of the third heat-conductive bonding medium covers an edge of the light receiving surface of the wavelength-converting layer and the wavelength-converting portion.

9. The wavelength-converting device according to claim 2, wherein the first heat-conductive bonding medium, the reflective layer and the wavelength-converting layer constitute a stacking structure, and a gap is formed between the stacking structure and at least one of the inner ring wall surface and the outer ring wall surface of the groove.

10. The wavelength-converting device according to claim 1, wherein the annular portion further comprises an optical portion, the optical portion is adjacent to the wavelength-converting portion, and the optical portion comprises an optical plate body.

11. The wavelength-converting device according to claim 10, wherein the optical plate body is a transmissive glass or a reflective glass, the transmissive glass comprises a glass substrate and an anti-reflection film, and the anti-reflection film is disposed on the glass substrate and faces the light incident side.

12. The wavelength-converting device according to claim 1, further comprising a motor having a rotating shaft, wherein the inner annular portion of the wavelength-converting device surrounds the rotating shaft.

13. A projection apparatus, comprising:

an illumination system, a light valve, and a projection lens, wherein the illumination system is adapted to provide an illumination beam, the light valve is disposed on a transmission path of the illumination beam and adapted to convert the illumination beam into an image beam, the projection lens is disposed on a transmission path of the image beam, and the illumination system comprises;

an exciting light source, adapted to provide an exciting beam; and

a wavelength-converting device, disposed on a transmission path of the exciting beam, a wavelength-converting layer of the wavelength-converting device is adapted to convert the exciting beam into a converted beam, wherein the wavelength-converting device has a light incident side and the wavelength-converting device comprises an inner annular portion and an annular portion, wherein;

the annular portion is connected to an outer edge of the inner annular portion, the annular portion comprises a wavelength-converting portion, a first heat-conductive bonding medium, a reflective layer, and the wavelength-converting layer, wherein;

a groove is annularly disposed in the wavelength-converting portion, and the groove is recessed from the light incident side of the wavelength-converting device;

the first heat-conductive bonding medium is disposed in the groove;

the reflective layer is disposed on the first heat-conductive bonding medium; and

the wavelength-converting layer is disposed on the reflective layer and has a light receiving surface.

14. The projection apparatus according to claim 13, wherein the groove comprises a bottom surface, an inner ring wall surface and an outer ring wall surface, and the first heat-conductive bonding medium is disposed on the bottom surface.

15. The projection apparatus according to claim 14, further comprising an optical structure, wherein the optical structure is disposed within a range of at least one of the inner ring wall surface and the outer ring wall surface of the groove, so that the optical structure is located between the wavelength-converting layer and at least one of the inner ring wall surface and the outer ring wall surface.

16. The projection apparatus according to claim 15, wherein the optical structure is selected from one of a scattering layer and a reflective layer.

17. The projection apparatus according to claim 14, further comprising a second heat-conductive bonding medium, wherein the second heat-conductive bonding medium is disposed on at least one of the inner ring wall surface and the outer ring wall surface, so that the second heat-conductive bonding medium is located at least at one of:

(1) between the wavelength-converting layer and at least one of the inner ring wall surface and the outer ring wall surface, (2) between the reflective layer and at least one of the inner ring wall surface and the outer ring wall surface, (3) between the first heat-conductive bonding medium and at least one of the inner ring wall surface and the outer ring wall surface.

18. The projection apparatus according to claim 17, further comprising an optical structure, wherein the wavelength-converting layer has an inner ring edge and an outer ring edge, the optical structure is disposed at least within a range of at least one of the inner ring wall surface and the outer ring wall surface of the groove, so that the optical structure is located at least at one of:

(1) between the inner ring edge of the wavelength-converting layer and the inner ring wall of the groove, (2) between the inner ring edge of the wavelength-converting layer and the second heat-conductive bonding medium within the range of the inner ring wall surface, (3) between the outer ring edge of the wavelength-converting layer and the outer ring wall surface of the groove, (4) between the outer ring edge of the wavelength-converting layer and the second heat-conductive bonding medium within the range of the outer ring wall surface.

19. The projection apparatus according to claim 18, wherein the optical structure is a scattering layer or a reflective layer.

20. The projection apparatus according to claim 13, further comprising a third heat-conductive bonding medium, wherein the groove recessed in the wavelength-converting portion has an inner ring edge and an outer ring edge on the light incident side, the third heat-conductive bonding medium is coated along part or all of at least one of the inner ring edge and the outer ring edge of the groove, so that a radial section of the third heat-conductive bonding medium covers an edge of the light receiving surface of the wavelength-converting layer and the wavelength-converting portion.

21. The projection apparatus according to claim 14, wherein the first heat-conductive bonding medium, the reflective layer and the wavelength-converting layer constitute a stacking structure, and a gap is formed between the stacking structure and at least one of the inner ring wall surface and the outer ring wall surface of the groove.

22. The projection apparatus according to claim 13, wherein the annular portion further comprises an optical portion, the optical portion is adjacent to the wavelength-converting portion, and the optical portion comprises an optical plate body.

23. The projection apparatus according to claim 22, wherein the optical plate body is a transmissive glass or a reflective glass, the transmissive glass comprises a glass substrate and an anti-reflection film, and the anti-reflection film is disposed on the glass substrate and faces the light incident side.

24. The projection apparatus according to claim 13, further comprising a motor having a rotating shaft, wherein the inner annular portion of the wavelength-converting device surrounds the rotating shaft.