Laser light source for projector and laser projection device

Patent metadata

Field	Value
Publication number	US-10288992-B2
Application number	US-201715854726-A
Country	US
Kind code	B2
Filing date	Dec 26, 2017
Priority date	Feb 16, 2017
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

A laser light source for projector includes a laser light source module, first and second light receiving modules, a phosphor wheel, and a light combining module. The phosphor wheel has a first and a second side. The phosphor wheel receives the laser and converts the laser into first and second fluorescent light. The phosphor wheel receives the laser at a first side and emits the first fluorescent light. The phosphor wheel emits the second fluorescent light at a second side. After the first fluorescent light and the second fluorescent light passes through the first and second light receiving modules, at least one of the directions of optical axes of the first and second fluorescent light is changed. The light combining module receives the first and second fluorescent lights and emits a combined light.

First claim

What is claimed is:

1. A laser light source for projector, comprising:
at least one first laser light source module, for emitting a first laser light;
a first light receiving module, wherein the first laser light passes through the first light receiving module;
a phosphor wheel, having a first side and a second side, for receiving the first laser light and converting the first laser light into a first fluorescent light and a second fluorescent light, wherein the first side receives the first laser light passing through the first light receiving module and emits the first fluorescent light, and the second side emits the second fluorescent light;
a second light receiving module, for receiving the second fluorescent light, wherein after the first fluorescent light passes through the first light receiving module and the second fluorescent light passes through the second light receiving module, at least one of the directions of optical axes of the first fluorescent light and the second fluorescent light is changed, wherein a total number of times by which the directions of the optical axes of the first fluorescent light and the second fluorescent light changes is at least twice;
a light combining module, for receiving the first fluorescent light passing through the first light receiving module and the second fluorescent light passing through the second light receiving module and combines the first and the second fluorescent lights to form a combined light; and
a second light source module directly emitting a second laser light into the light combining module.

2. The laser light source for projector of claim 1 , wherein the first laser light is blue light.

3. The laser light source for projector of claim 1 , wherein the first fluorescent light and the second fluorescent light have the same spectrum.

4. The laser light source for projector of claim 1 , wherein a brightness difference between the first fluorescent light and the second fluorescent light is less than 5%.

5. The laser light source for projector of claim 1 , wherein the first fluorescent light and the second fluorescent light are red lights, green lights, yellow lights, or combinations thereof.

6. The laser light source for projector of claim 1 , wherein the first light receiving module comprises:
at least one dichroic mirror, for making the first laser light pass through the dichroic mirror and reflecting the first fluorescent light.

7. The laser light source for projector of claim 1 , wherein the first light receiving module comprises:
a converging module, for converging the first fluorescent light.

8. The laser light source for projector of claim 1 , wherein the second light receiving module comprises:
at least a reflecting mirror, for reflecting the second fluorescent light.

9. The laser light source for projector of claim 1 , wherein the second light receiving module comprises:
a converging module, for converging the second fluorescent light.

10. The laser light source for projector of claim 1 , wherein the light combining module comprises:
an integration rod, having an opening, for emitting the combined light; and
an optical path adjusting module, for making the direction of the optic axis of the first fluorescent light the same as that of the optic axis of the second fluorescent light after the first fluorescent light and the second fluorescent light pass through the optical path adjusting module, and making the first fluorescent light and the second fluorescent light enter the opening.

11. The laser light source for projector of claim 1 , wherein the first laser light passes through the phosphor wheel, first laser light leaves the second side and enters the second light receiving module, the second light receiving module is used for changing the direction of the optic axis of the first laser light, and the first laser light enters the light combining module after leaving the second light receiving module.

12. The laser light source for projector of claim 1 , wherein the phosphor wheel comprises at least a first phosphor layer, the first phosphor layer is used for converting the first laser light into the first fluorescent light and the second fluorescent light.

13. The laser light source for projector of claim 12 , wherein the phosphor wheel further comprises at least a transparent substrate, and the first phosphor layer is disposed on the transparent substrate.

14. The laser light source for projector of claim 12 , wherein the phosphor wheel further has at least a first portion, and the first phosphor layer is disposed in the first portion.

15. The laser light source for projector of claim 14 , wherein the phosphor wheel further comprises at least a second portion, the second portion is transparent, and the first portion and the second portion are used for receiving the first laser light at different timings.

16. The laser light source for projector of claim 14 , wherein the phosphor wheel further comprises a third portion, the phosphor wheel further comprises at least a second phosphor layer, the second phosphor layer is disposed in the third portion, wherein the first portion and the third portion are used for receiving the first laser light at different timings, and the first phosphor layer and the second phosphor layer are used for converting the first laser light at different timings, for making the lights emitted from the first phosphor layer and the second phosphor layer be combined to form the first fluorescent light and the second fluorescent light.

17. A laser projection device, comprising:
the laser light source for projector of claim 1 ;
a wavelength selector, for receiving the combined light, and emitting a first color light, a second color light, and a third color light;
at least one image module, for receiving the first color light, the second color light and the third color light, and generating at least an image light; and
a projection module, for receiving the image light, and generating at least a projection light.

18. The laser projection device of claim 17 , wherein an amount of the at least one image module is three, and the image modules respectively receives the first color light, the second color light and the third color light for generating a first color image light, a second color image light and a third color image light correspondingly, and the first color image light, the second color image light and the third color image light are combined to form the image light.

19. The laser projection device of claim 17 , wherein an amount of the at least one image module is one, and the wavelength selector emits the first color light, the second color light and the third color light at different timings, the image module receives the first color light, the second color light and the third color light at different timings, and generates the image lights at different timings, the projection module receives the image lights at different timings, and generates the projection lights at different timings.

Assignees

• Delta Electronics Inc

Inventors

• Chang Keh-Su
• Lu Chun-Hsien
• Chou Yen-I
• Chen Chi
• Kuo Po-Tsun

Classifications

• G03B21/204 Primary

  using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197) · CPC title

• G03B21/2013

  Plural light sources · CPC title

• H04N9/3158

  for controlling the spectrum · CPC title

• G03B33/12

  using beam-splitting or beam-combining systems, e.g. dichroic mirrors · CPC title

• G03B21/208

  Homogenising, shaping of the illumination light · CPC title