Light-emitting device and projection system

Patent metadata

Field	Value
Publication number	US-9897899-B2
Application number	US-201515326873-A
Country	US
Kind code	B2
Filing date	Jul 8, 2015
Priority date	Jul 28, 2014
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

The present disclosure discloses a light-emitting device and a projection system, comprising: a light source, configured to emit excitation light; a beam-splitting-combining plate disposed in an outgoing light path of the excitation light, and including a beam-splitting portion configured to split the excitation light into a first excitation light and a second excitation light along different propagation paths; a first wavelength conversion device including a first wavelength converting layer configured to absorb the first excitation light to generate first excited light; and a second wavelength conversion device configured to reflect the second excitation light back to the beam-splitting-combining plate. The beam-splitting-combining plate further includes a beam-combining portion disposed around the beam-splitting portion, and the beam-combining portion is configured to combine the first excited light and the second excitation light respectively reflected to the beam-splitting-combining plate into one beam.

First claim

What is claimed is:

1. A light-emitting device, comprising:
a light source, configured to emit excitation light;
a beam-splitting-combining plate disposed in an outgoing light path of the excitation light, wherein the beam-split-combination plate includes a beam-splitting portion configured to split the excitation light into a first excitation light and a second excitation light with different propagation paths;
a first wavelength converter disposed in an outgoing light path of the first excitation light, and including a first wavelength converting layer configured to absorb the first excitation light to generate first excited light, and reflect the first excited light to the beam-splitting-combining plate; and
a second wavelength converter disposed in an outgoing light path of the second excitation light and configured to reflect a portion of the second excitation light to the beam-splitting-combining plate,
wherein the beam-splitting-combining plate further includes a beam-combining portion disposed around the beam-splitting portion,
the beam-combining portion is configured to combine the first excited light and the second excitation light respectively reflected to the beam-splitting-combining plate into one beam, and
the second wavelength converter further a second wavelength converting layer configured to absorb another portion of the second excitation light to generate a second excited light, and reflect the second excited light to the beam-splitting-combining plate.

2. The light-emitting device according to claim 1 , wherein, the beam-splitting portion is disposed at a central area of the beam-splitting-combining plate, and the beam-splitting portion includes a 50/50 transflective film.

3. The light-emitting device according to claim 1 , wherein, when the second wavelength converter further includes the second wavelength converting layer, the beam-combining portion is configured to combine the first excited light, the second excited light, and the second excitation light respectively reflected to the beam-splitting-combining plate into one beam.

4. The light-emitting device according to claim 3 , wherein, the beam-combining portion includes a filter, configured to reflect the first excited light and transmit the second excited light and the second excitation light, or a filter, configured to transmit the first excited light and reflect the second excited light and the second excitation light.

5. The light-emitting device according to claim 4 , wherein, the beam-splitting portion includes a filter, configured to partially transmit and partially reflect the excitation light, reflect the first excited light, and transmit the second excited light, or a filter, configured to partially transmit and partially reflect the excitation light, transmit the first excited light, and reflect the second excited light.

6. The light-emitting device according to claim 5 , wherein, the first wavelength converter or the second wavelength converter includes red phosphor, and the red phosphor absorbs the excitation light to generate excited light containing near-infrared light.

7. The light-emitting device according to claim 6 , wherein, when the second wavelength converter includes the red phosphor and the red phosphor absorbs the excitation light to generate the excited light containing near-infrared light, the first wavelength converter includes yellow phosphor.

8. The light-emitting device according to claim 7 , wherein, when the first excitation light has a same propagation path as the excited light, the beam-combining portion includes a filter configured to transmit light with a wavelength less than 480 nm and greater than 650 nm, and reflect light with a wavelength between 480 nm and 650 nm; and
the beam-splitting portion further includes a filter configured to reflect light with a wavelength between 480 nm and 650 nm, transmit light with a wavelength greater than 650 nm, and partially transmit and partially reflect light with a wavelength less than 480 nm.

9. The light-emitting device according to claim 7 , wherein, when the second excitation light has a same propagation path as the excited light, the beam-combining portion includes a filter configured to reflect light with a wavelength less than 480 nm and greater than 650 nm, and transmit light with a wavelength between 480 nm and 650 nm; and
the beam-splitting portion further includes a filter configured to transmit light with a wavelength between 480 nm and 650 nm, reflect light with a wavelength greater than 650 nm, and partially transmit and partially reflect light with a wavelength less than 480 nm.

10. The light-emitting device according to claim 6 , wherein, when the first wavelength converter includes the red phosphor absorbing the excitation light to generate the excited light containing near-infrared light, the second wavelength converter includes yellow phosphor.

11. The light-emitting device according to claim 10 , wherein, when the second excitation light has a same propagation path as the excited light, the beam-combining portion includes a filter, configured to transmit light with a wavelength greater than 650 nm, and reflect light with a wavelength less than 650 nm; and
the beam-splitting portion further includes a filter, configured to reflect light with a wavelength between 480 nm and 650 nm, transmit light with a wavelength greater than 650 nm, and partially transmit and partially reflect light with a wavelength less than 480 nm.

12. The light-emitting device according to claim 10 , wherein, when the first excitation light has a same propagation path as the excited light, the beam-combining portion includes a filter, configured to reflect light with a wavelength greater than 650 nm, and transmit light with a wavelength less than 650 nm; and
the beam-splitting portion further includes a filter, configured to transmit light with a wavelength between 480 nm and 650 nm, reflect light with a wavelength greater than 650 nm, and partially transmit and partially reflect light with a wavelength less than 480 nm.

13. The light-emitting device according to claim 8 , further including:
a first condenser lens disposed between the first wavelength converter and the beam-splitting-combining plate and, meanwhile, disposed at the outgoing light path of the first excitation light and the first excited light; and
a second condenser lens disposed between the second wavelength converter and the beam-splitting-combining plate and, meanwhile, disposed at the outgoing light path of the second excitation light and the second excited light.

14. A projection system, comprising a light-emitting device, wherein the light-emitting device comprising:
a light source, configured to emit excitation light;
a beam-splitting-combining plate disposed in an outgoing light path of the excitation light, wherein the beam-split-combination plate includes a beam-splitting portion configured to split the excitation light into a first excitation light and a second excitation light with different propagation paths;
a first wavelength converter disposed in an outgoing light path of the first excitation light, and including a first wavelength converting layer configured to absorb the first excitation light to generate first excited light, and reflect the first excited light to the beam-splitting-combining plate; and
a second wavelength converter disposed in an outgoing light path of the second excitation light and configured to reflect a portion of the second excitation light to the beam-splitting-combining plate,
wherein the beam-splitting-combining plate further includes a beam-combining portion disposed around

Assignees

• Appotronics Corp Ltd

Inventors

• Hu Fei
• Yang Jiayi

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

• G02B19/0014

  at least one surface having optical power · CPC title

• G03B21/2066

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

• G03B33/06

  by additive-colour projection apparatus · CPC title

• G02B27/141

  using dichroic mirrors · CPC title