Laser light source and laser projection device

Patent metadata

Field	Value
Publication number	US-2023184392-A1
Application number	US-202318107970-A
Country	US
Kind code	A1
Filing date	Feb 9, 2023
Priority date	Jan 10, 2019
Publication date	Jun 15, 2023
Grant date	—

Abstract

Embodiments of the present application provide a laser light source and a laser projection device. The laser light source includes a laser assembly and a light combination mirror assembly. The laser assembly includes at least a laser, a light emitting surface of the laser has a plurality of light emitting regions, and beams emitted from different ones of the plurality of light emitting regions are in different colors. The light combination mirror assembly includes a plurality of mirrors that are sequentially arranged along an optical transmission path of the laser, with each of the mirrors corresponding to one of the light emitting regions. The light combination mirror assembly is used to converge the beams in different colors emitted from the laser to form a white beam.

First claim

What is claimed is:

1 . A laser light source, comprising:
a laser assembly, wherein the laser assembly at least comprises a laser, a light emitting surface of the laser has a plurality of light emitting regions, and beams emitted from different ones of the plurality of light emitting regions are in different colors; and a light combination mirror assembly, wherein the light combination mirror assembly comprises a plurality of mirrors that are sequentially arranged along an optical transmission path of the laser, with each of the mirrors corresponding to one of the light emitting regions, and the light combination mirror assembly is used to converge the beams in different colors emitted from the laser to form a white beam.

2 . The laser light source according to claim 1 , wherein the beams in different colors emitted from the plurality of light emitting regions are all in a first direction;
the beams emitted from the plurality of light emitting regions are at least reflected by the plurality of mirrors, the reflected beams are in a second direction different from the first direction, and optical paths of the reflected beams along the second direction overlap with each other; and the plurality of mirrors are arranged in order at intervals along the second direction.

3 . The laser light source according to claim 2 , wherein the plurality of light emitting regions of the light emitting surface of the laser are arranged at intervals in one plane.

4 . The laser light source according to claim 1 , wherein the plurality of mirrors comprise at least one reflection mirror and at least one light combination mirror, each light combination mirror is used to reflect a beam emitted by a corresponding light emitting region while allowing beams corresponding to other light emitting regions to pass through, and each reflection mirror is used to reflect a beam emitted by a corresponding light emitting region.

5 . The laser light source according to claim 1 , wherein the plurality of mirrors are reflection mirrors, each of the reflection mirrors is used to reflect a beam of a corresponding color, and is not in the way of optical paths of beams of other colors.

6 . The laser light source according to claim 1 , wherein the plurality of mirrors are light combination mirrors, and each light combination mirror is used to reflect a beam of a corresponding color, while allowing beams of other colors to pass through without blocking reflection optical paths of the beams of other colors.

7 . The laser light source according to claim 2 , wherein an angle is formed between each of the mirrors of the light combination mirror assembly and a light emitting direction of a corresponding light emitting region; and
inclination angles of all the mirrors with respect to the first direction are the same.

8 . The laser light source according to claim 1 , wherein the plurality of light emitting regions comprise a green light emitting region for emitting a green beam, a blue light emitting region for emitting a blue beam, and a red light emitting region for emitting a red beam;
the plurality of mirrors comprises a green mirror, a blue mirror and a red mirror corresponding to the green beam, the blue beam and the red beam, respectively; and surfaces of the green mirror, the blue mirror and the red mirror, that face toward the light emitting surface of the laser, are inclined relative to the light emitting surface of the laser.

9 . The laser light source according to claim 8 , wherein an area of the red beam emitted by the red light emitting region is larger than an area of the blue beam emitted by the blue light emitting region and an area of the green beam emitted by the green light emitting region.

10 . The laser light source according to claim 8 , wherein the laser further comprises a substrate and light emitting chips in different colors arranged on the substrate;
the light emitting chips in different colors are arranged in four rows, two adjacent rows of the four rows of light emitting chips emit the red beam and form the red light emitting region, and the other two of the four rows of light emitting chips emit the blue beam and the green beam, and form the blue light emitting region and the green light emitting region, respectively; or the light emitting chips in different colors are arranged in a cross form.

11 . The laser light source according to claim 8 , wherein the green mirror is a reflection mirror, the blue mirror is a first light combination mirror, and the red mirror is a second light combination mirror,
the reflection mirror is used to reflect the green beam, the first light combination mirror is used to reflect the blue beam and allow the reflected green beam to pass through, and the second light combination mirror is used to reflect the red beam and allow the reflected green beam and the reflected blue beam to pass through; and the second light combination mirror corresponding to the red light emitting region has a larger surface area than a surface area of the first light combination mirror and a surface area of the reflection mirror.

12 . The laser light source according to claim 7 , wherein the angle formed between each of the mirrors and the light emitting direction of a corresponding light emitting region is greater than or equal to 43 degrees, and less than or equal to 47 degrees; or
a distance between a highest point of each of the mirrors and the light emitting surface of the laser is between 1 mm and 40 mm.

13 . The laser light source according to claim 1 , wherein the laser light source further includes a housing having a receiving cavity, the laser and the light combination mirror assembly are at least partially accommodated in the receiving cavity, and the receiving cavity has an opening facing a light emitting direction of the laser light source.

14 . The laser light source according to claim 13 , wherein the laser light source further includes a lens arranged at the opening, and a distance between an optical axis of the lens and the light emitting surface of the laser is greater than or equal to 6 mm.

15 . The laser light source according to claim 1 , wherein the laser assembly further comprises a circuit board, the circuit board is arranged outside the laser, and has a first surface and a second surface which are oppositely arranged; and
the laser has a substrate on which light emitting chips emitting beams in different colors are arranged, and the circuit board has a receiving region for receiving the laser, a light emitting direction of the laser is along an axial direction of the receiving region, the light emitting surface of the laser is arranged in parallel with the first surface of the circuit board, and the circuit board is parallel to and electrically connected with the substrate.

16 . The laser light source according to claim 15 , wherein when the laser assembly is fixed to a housing of the laser light source, the light emitting surface of the laser faces an inner side of the housing, and a back surface of the laser faces an outer side of the housing; and
the back surface of the laser is a plane for attaching a heat sink directly to the laser.

17 . The laser light source according to claim 1 , wherein the laser light source comprises a housing, the housing has a laser mounting port in which the laser is arranged;
the laser comprises a substrate and light emitting chips in different colors provided on one surface of the substrate, the one surface of the substrate on which the light emitting chips are provided serves as the light emitti

Assignees

• Hisense Laser Display Co Ltd

Inventors

• Tian Xintuan
• Yang Changming
• Zhao Yun
• Cui Lei
• Xing Zhe

Classifications

• G03B21/145

  Housing details, e.g. position adjustments thereof · CPC title

• H01S5/02216

  Butterfly-type, i.e. with electrode pins extending horizontally from the housings · CPC title

• H01S5/4012

  Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms · CPC title

• H01S5/02253

  using lenses · CPC title

• G03B21/2033

  LED or laser light sources · CPC title