Wavelength conversion device, light-emitting device and projection system

Patent metadata

Field	Value
Publication number	US-2016004147-A1
Application number	US-201414770027-A
Country	US
Kind code	A1
Filing date	Mar 3, 2014
Priority date	Mar 5, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

Disclosed are a wavelength conversion device, a light-emitting device and a projection system, comprising a wavelength conversion layer having a first surface and a second surface opposite each other. The first surface receives an excitation light. The wavelength conversion layer absorbs the excitation to produce a converted light and emits the converted light or the mixture of the converted light and the excitation light from the first surface and the second surface. A scattering reflective substrate is stacked with the wavelength conversion layer and includes a white porous ceramic or a white scattering material for scattering the incident light. The scattering reflective substrate includes a third surface facing the second surface and scatters at least a part of the incident light on the third surface and then emits all the light from the third surface to the second surface.

First claim

1 . A wavelength conversion device, including:
a wavelength conversion layer, having a first surface and a second surface opposite each other, wherein the first surface is disposed to receive an excitation light, wherein the wavelength conversion layer absorbs the excitation light to generate a converted light, and outputs the converted light or a mixed light of the converted light and the excitation light from the first surface and the second surface; a scattering reflective substrate which is stacked with the wavelength conversion layer, the scattering reflective substrate including a white porous ceramic or a white scattering material, the white scattering material being a salt or an oxide, the white porous ceramic or white scattering material scattering a light incident on it, wherein the scattering reflective substrate has a third surface facing the second surface, the scattering reflective substrate scattering at least a portion of the light incident on the third surface and outputting all of the light incident on the third surface to the second surface.

2 . The wavelength conversion device of claim 1 , further comprising:
a drive device for driving the wavelength conversion layer and the scattering reflective substrate to move, so that a light spot of the excitation light formed on the wavelength conversion layer acts upon the wavelength conversion layer along a predetermined path.

3 . The wavelength conversion device of claim 1 , wherein the scattering reflective substrate includes a white porous ceramic plate.

4 . The wavelength conversion device of claim 3 , wherein diameters of pores of the white porous ceramic plate are less than or equal to 1 micron.

5 . The wavelength conversion device of claim 3 , wherein the scattering reflective substrate further includes a metal plate, located on and is in tight contact with a surface of the white porous ceramic plate that faces away from the wavelength conversion material.

6 . The wavelength conversion device of claim 1 , wherein the scattering reflective substrate includes a scattering reflective layer and a base plate stacked together, wherein the scattering reflective layer includes a white scattering material, and is located between the base plate and the wavelength conversion layer and affixed to the base plate, wherein a surface of the scattering reflective layer that faces the wavelength conversion layer is the third surface of the scattering reflective substrate, wherein the scattering reflective layer scatters all of the light incident on the third surface and outputs all of the scattered light from the third surface.

7 . The wavelength conversion device of claim 1 , wherein the scattering reflective substrate includes a scattering reflective layer and a base plate stacked together;
wherein the scattering reflective layer includes a white scattering material, and is located between the base plate and the wavelength conversion layer and affixed to the base plate, wherein the surface of the scattering reflective layer that faces the wavelength conversion layer is the third surface of the scattering reflective substrate, and a surface of the scattering reflective layer opposite the third surface is a fourth surface, wherein the scattering reflective layer scatters a portion of the light incident on the third surface and outputs the scattered light from the third surface and the fourth surface, and further transmits a remaining portion of the light incident on the third surface via the fourth surface; wherein the base plate is a reflecting mirror plate, which reflects light incident on it form the fourth surface of the scattering reflective layer back to the fourth surface.

8 . The wavelength conversion device of claim 7 , wherein a reflectivity of the reflecting mirror plate is R, wherein the scattering reflective layer scatters a portion of the light incident on the third surface and outputs the scattered light from the third surface and the fourth surface, wherein a ratio of the light scattered and outputted from the third surface to the light incident on the third surface is P, wherein (1-R)(1-P)≦10%, and wherein R≧50%.

9 . The wavelength conversion device of claim 6 or claim 7 , wherein the wavelength conversion layer includes a first glass material and a wavelength conversion material, wherein the scattering reflective layer includes a second glass material and a white scattering material, and wherein a melting point of the first glass material is lower than a melting point of the second glass material.

10 . The wavelength conversion device of claim 1 , wherein the wavelength conversion layer includes a wavelength conversion material and an inorganic adhesive, wherein the inorganic adhesive adheres the wavelength conversion material into a solid mass.

11 . A light emitting device, including a first light source and the wavelength conversion device of claim 1 , wherein the excitation light received by the first surface of the wavelength conversion device is from the first light source.

12 . The light emitting device of claim 11 , wherein the first light source is a laser source for outputting a laser excitation light to the first surface of the wavelength conversion device, wherein the wavelength conversion device receives the laser excitation light and converts a portion of the laser excitation light to the converted light, and scattering reflects un-absorbed laser excitation light, wherein the converted light and the un-absorbed laser excitation light are output from the first surface.

13 . The light emitting device of claim 11 , further comprising a second light source and a light combination device;
wherein the first light source is a laser source for outputting a first color light, the second light source is a laser source for outputting a second color light, and wherein the first color light is the excitation light; wherein the light combination device includes a first region and a second region surrounding the first region, wherein the first color light and the second color light are incident on the first region of the light combination device from a same direction; wherein the first region has an optical property that transmits the first color light and the second color light, and the second region has an optical property that reflects the converted light and the second color light, and wherein the first color light and the second color light are transmitted through the first region to the first surface of the wavelength conversion device; or wherein the first region has an optical property that reflects the first color light and the second color light, and the second region has an optical property that transmits the converted light and the second color light, and wherein the first color light and the second color light are reflected by the first region to the first surface of the wavelength conversion device; wherein the converted light or a mixed light of the converted light and un-absorbed first color light is output from the first surface to the light combination device, wherein the wavelength conversion device scattering reflects the second color light without absorbing it and outputs it from the first surface to the light combination device.

14 . The light emitting device of claim 11 , further comprising a second light source and a light combination device;
wherein the first light source surrounds the second light source, wherein the first light source outputs a first color light, wherein the second light source is a laser source for outputting a second color light, and wherein the first color light is the excitation light; wherein the light combina

Assignees

• Appotronics Corp Ltd

Inventors

• Hu Fei
• Yang Jiayi
• Yang Yi

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

• H04N9/315

  Modulator illumination systems (general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20) · CPC title

• G03B21/2066

  Reflectors in illumination beam (in projection beam G03B21/28) · CPC title

• G02B26/008

  in the form of devices for effecting sequential colour changes, e.g. colour wheels · CPC title

• G03B21/206

  Control of light source other than position or intensity · CPC title