Fluorescent wheel, double-color laser source and laser projection equipment

Patent metadata

Field	Value
Publication number	US-10114210-B2
Application number	US-201615294595-A
Country	US
Kind code	B2
Filing date	Oct 14, 2016
Priority date	Oct 14, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

The disclosure provides a fluorescent wheel, including a fluorescent region and a transmission region; the fluorescent region has fluorescence powder for emitting fluorescence under excitation by excitation laser; and the transmission region is for transmitting laser; the fluorescent wheel is for diffusing at least laser to be transmitted. Using fluorescent wheel to diffuse laser enables laser transmission meanwhile removing speckles by diffusion, sparing a separate speckle-removing component, improving light processing efficiency of fluorescent wheel. The disclosure also provides a double-color laser source using the fluorescent wheel, and a laser projection equipment including the double-color laser source, which can output three-primary-color light via fluorescent wheel component, meanwhile removing speckles for double-color laser, thereby reducing usage of optical components, and lowering complexity of optical architecture of double-color laser source, contributing to miniaturization of laser projection equipment. The disclosure is applied in the field of laser illumination display technologies.

First claim

What is claimed is:

1. A fluorescent wheel comprising a fluorescent region and a transmission region;
wherein the fluorescent region has fluorescence powder for emitting fluorescence under excitation by second laser light and the transmission region is for transmitting first laser light and the second laser light;
wherein the transmission region is a diffusion component, and the diffusion component comprises a first laser diffusion region for transmitting and diffusing the first laser light, and a second laser diffusion region for transmitting and diffusing the second laser light,
wherein the second laser light is excitation laser light, and a degree to which light is diffused by the first laser diffusion region is larger than a degree to which light is diffused by the second laser diffusion region.

2. The fluorescent wheel according to claim 1 , wherein the diffusion component is coated with a diffuser on a surface of the diffusion component;
the diffusion component is formed by sand blasting; or
the diffusion component has a micro-structure.

3. The fluorescent wheel according to claim 1 ,
wherein an arc-shaped notch is arranged at an outer circumference of the fluorescent wheel, and the diffusion component is embedded in the arc-shaped notch.

4. The fluorescent wheel according to claim 1 ,
wherein a sector-shaped notch is arranged in the fluorescent wheel, and the diffusion component is embedded in the sector-shaped notch.

5. The fluorescent wheel according to claim 1 ,
wherein the fluorescent region comprises a fluorescent layer and a coating film layer arranged on the fluorescent layer; and the coating film layer is a dichroic film for transmitting the excitation laser light and reflecting the fluorescence.

6. The fluorescent wheel according to claim 5 , wherein the fluorescent layer is formed by curing mixed fluorescence powder and an inorganic material, wherein the inorganic material comprises one of ceramic, quartz and glass.

7. A fluorescent wheel, comprising a fluorescent region and a transmission region;
wherein the fluorescent region has fluorescence powder for emitting fluorescence under excitation by excitation laser light and the transmission region is for transmitting laser light;
the fluorescent wheel is for diffusing at least the laser light which is to be transmitted by the transmission region,
wherein a diffusion layer is arranged on a surface of the fluorescent wheel, and the diffusion layer is arranged corresponding to at least the transmission region, for diffusing laser light before the laser light arrives at the transmission region.

8. The fluorescent wheel according to claim 7 , wherein the transmission region comprises a first laser transmission region for transmitting first laser light and a second laser transmission region for transmitting second laser light, correspondingly, the diffusion layer comprises a first laser diffusion region for diffusing the first laser light and a second laser diffusion region for diffusing the second laser light, wherein the second laser light is the excitation laser light, a degree to which light is diffused by the first laser diffusion region is larger than a degree to which light is diffused by the second laser diffusion region.

9. The fluorescent wheel according to claim 8 , wherein the diffusion layer is prepared through a semiconductor photolithography process.

10. The fluorescent wheel according to claim 7 , wherein the diffusion layer has a shape matching a shape of the transmission region, and is fixed on a surface of the transmission region through bonding by silicone.

11. The fluorescent wheel according to claim 7 , wherein the diffusion layer is sector-shaped, a central angle to which the diffusion layer corresponds equals to a central angle to which the transmission region corresponds, and the diffusion layer is fixed to the fluorescent wheel via a rivet in a region of the central angle to which the diffusion layer corresponds to, or via dispensing in the region of the central angle to which the diffusion layer corresponds to.

12. The fluorescent wheel according to claim 7 , wherein the diffusion layer is also arranged corresponding to the fluorescent region, wherein a degree to which light is diffused by the region of the diffusion layer arranged corresponding to the fluorescent region is smaller than a degree to which light is diffused by the region of the diffusion layer arranged corresponding to the transmission region.

13. The fluorescent wheel according to claim 12 , wherein the diffusion layer is disc-shaped, and the diffusion layer is fixed to the fluorescent wheel via a rivet in a central region or via dispensing in the central region.

14. The fluorescent wheel according to claim 7 , wherein the transmission region is made of a transparent glass material, and the diffusion layer is made of frosted glass or a diffusion sheet material.

15. The fluorescent wheel according to claim 7 , wherein an antireflection film is also arranged on an outer surface of the diffusion layer.

16. A double-color laser source, comprising a blue laser device and a red laser device for respectively emitting blue laser light and red laser light, wherein the double-color laser source also comprises a fluorescent wheel wherein the fluorescent wheel comprises a fluorescent region and a transmission region;
the fluorescent region has green fluorescence powder for emitting green fluorescence under excitation by excitation laser light and the transmission region is for transmitting first laser light and second laser light the fluorescent wheel is for diffusing at least the first laser light and the second laser light which are to be transmitted by the transmission region,
wherein the first laser light is red laser light, the second laser light is blue laser light, the excitation laser light is blue laser light, and the red laser light, the blue laser light and the green fluorescence are sequentially outputted by the fluorescent wheel to form three-primary-color light.

17. The laser source according to claim 16 , wherein the transmission region of the fluorescent wheel is a diffusion component, the diffusion component comprises a red laser diffusion region for transmitting and diffusing the red laser light and a blue laser diffusion region for transmitting and diffusing the blue laser light, and a degree to which light is diffused by the red laser diffusion region is larger than a degree to which light is diffused by the blue laser diffusion region.

18. The laser source according to claim 16 , wherein a surface of the fluorescent wheel is also provided with a diffusion layer, which is arranged corresponding to at least the transmission region, for diffusing laser light before the laser light arrives at the transmission region;
wherein the transmission region comprises a red laser transmission region for transmitting the red laser light and a blue laser transmission region for transmitting the blue laser light, correspondingly, the diffusion layer comprises a red laser diffusion region for diffusing the red laser light and a blue laser diffusion region for diffusing the blue laser light, and a degree to which light is diffused by the red laser diffusion region is larger than a degree to which light is diffused by the blue laser diffusion region.

19. The laser source according to claim 16 , wherein, a first focusing optical path system is configured such that the red laser light and the blue laser light also pass through the first focusing optical path system before being incident onto

Assignees

• Hisense Co Ltd
• Hisense Usa Corp
• Hisense Int Co Ltd

Inventors

• Tian Youliang
• Wang Qiang
• Liu Xianrong
• Li Wei

Classifications

• H04N9/3161

  using laser light sources (using laser beams scanning the display screen H04N9/3129) · CPC title

• G02B27/48

  Laser speckle optics · CPC title

• G02B1/11

  Anti-reflection coatings · CPC title

• H04N9/3164

  using multiple light sources · CPC title

• G02B5/0294

  adapted to provide an additional optical effect, e.g. anti-reflection or filter · CPC title