Laser array, laser light source and laser projection device

• US 10,642,138 B2
• Filed: 07/31/2019
• Issued: 05/05/2020
• Est. Priority Date: 09/26/2017
• Status: Active Grant

• Current Assignee: Qingdao Hisense Laser Display Co., Ltd., Hisense International Company Limited (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.), Hisense USA Corporation (Qingdao Huatong State-Owned Capital Operation (Group) Co., Ltd.)
• Original Assignee: Qingdao Hisense Laser Display Co., Ltd.
• Inventors: Tian, Youliang, Jia, Changming
• Primary Examiner(s): Howard, Ryan D
• Application Number:
  US16/527,548
• Publication Number:
  US 20190354000A1
• Time in Patent Office: 279 Days
• CPC Class Codes: G02B 27/48 Laser speckle optics
• CPC Class Codes: G03B 21/2033 LED or laser light sources
• CPC Class Codes: H01S 3/0007 Applications not otherwise provided for working metals or other materials by laser beam B23K26/00; using photons to produce a reactive propulsive thrust F03H3/00; optical recording of measured values in general G01D15/14; optics in general G02B; holographic processes or apparatus G03H; optical marking or sensing of data record carriers G06K7/10 - G06K7/14, G06K15/12; injection heating of plasma by laser H05H1/22; acceleration of neutral particles by electromagnetic wave pressure H05H3/04
• CPC Class Codes: H01S 5/005 Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping H01S5/026, H01S5/18388 take precedence
• CPC Class Codes: H01S 5/02216 Butterfly-type, i.e. with electrode pins extending horizontally from the housings
• CPC Class Codes: H01S 5/02253 using lenses
• CPC Class Codes: H01S 5/02255 using beam deflecting elements
• CPC Class Codes: H01S 5/02469 Passive cooling, e.g. where heat is removed by the housing as a whole or by a heat pipe without any active cooling element like a TEC
• CPC Class Codes: H01S 5/02476 Heat spreaders, i.e. improving heat flow between laser chip and heat dissipating elements
• CPC Class Codes: H01S 5/4018 Lasers electrically in series
• CPC Class Codes: H01S 5/4025 Array arrangements, e.g. constituted by discrete laser diodes or laser bar H01S5/42 takes precedence
• CPC Class Codes: H01S 5/4031 Edge-emitting structures
• CPC Class Codes: H01S 5/405 Two-dimensional arrays
• CPC Class Codes: H01S 5/4087 emitting more than one wavelength
• CPC Class Codes: H01S 5/4093 Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion
• CPC Class Codes: H01S 5/42 Arrays of surface emitting lasers
• CPC Class Codes: H04N 9/3161 using laser light sources using laser beams scanning the display screen H04N9/3129
• CPC Class Codes: H04N 9/3164 using multiple light sources

Abstract

A laser array including at least one line of lasers. The at least one line of lasers includes a first laser and a second laser which are adjacent to each other. A first laser beam emitted by the first laser and a second laser beam emitted by the second laser are both in a first color, and the first laser beam has a wavelength less than that of the second laser beam.

Claims

1. A laser array comprising:

a metal substrate;

a reflective protrusion fixedly connected to the metal substrate, wherein the reflective protrusion is configured to reflect light towards an opposite direction to the metal substrate;

at least one line of lasers, wherein the at least one line of lasers comprises at least two first lasers and a second laser, the second laser positioned between two of the at least two first lasers;

wherein the at least two first lasers are configured to emit a first laser beam, and the second laser are configured to emit a second laser beam;

wherein the first laser beam and the second laser beam are both within wavelengths of a first color, and a first wavelength of the first laser beam is less than a second wavelength of the second laser beam; and

wherein each laser in the at least one line of lasers comprises a light-emitting chip, wherein each light-emitting chip is fixedly connected to the metal substrate and configured to emit light towards the reflective protrusion.

2. The laser array according to claim 1, wherein the at least two first lasers and at least two second lasers are arranged in a same line, one of the at least two first lasers is positioned between two second lasers, and one of the at least two second lasers is positioned between two first lasers.

3. The laser array according to claim 1, wherein:

the at least one line of lasers further comprises a third laser configured to emit a third laser beam;

the third laser beam is within wavelengths of the first color, and a third wavelength of the third laser beam is greater than the second wavelength of the second laser beam; and

the third laser is adjacent to one of the at least two first lasers or the second lasers.

4. The laser array according to claim 1, wherein:

the at least one line of lasers further comprises a fourth laser and a fifth laser, wherein the fourth laser is adjacent to the fifth laser;

the fourth laser is configured to emit a fourth laser beam, the fifth laser is configured to emit a fifth laser beam;

the fourth laser beam and the fifth laser beam are both within wavelengths of a second color, the second color being different from the first color; and

a fourth wavelength of the fourth laser beam is less than a fifth wavelength of the fifth laser beam.

5. The laser array according to claim 4, wherein at least two fourth lasers and at least two fifth lasers are arranged in a same line, one of the at least two fourth lasers is positioned between two fifth lasers, and one of the at least two fifth lasers is positioned between two fourth lasers.

6. The laser array according to claim 4, wherein:

the at least one line of lasers further comprises a sixth laser configured to emit a sixth laser beam;

the sixth laser beam is within wavelengths of the second color;

a sixth wavelength of the sixth laser beam is greater than the fifth wavelength of the fifth laser beam; and

the sixth laser is positioned adjacent to at least one of the fourth laser or the fifth laser.

7. The laser array according to claim 4, wherein:

the at least one line of lasers further comprises a seventh laser and an eighth laser, wherein the seventh laser is positioned adjacent to the eighth laser;

the seventh laser is configured to emit a seventh laser beam, the eighth laser is configured to emit an eighth laser beam;

the seventh laser beam and the eighth laser beam are both within wavelengths of a third color, the third color being different from both the first color and the second color; and

a seventh wavelength of the seventh laser beam is less than an eight wavelength of the eighth laser beam.

8. The laser array according to claim 7, wherein at least two seventh lasers and at least two eighth lasers are arranged in a same line, one of the at least two seventh lasers is positioned between two eighth lasers, and one of the at least two eighth lasers is positioned between two seventh lasers.

9. The laser array according to claim 7, wherein the at least one line of lasers further comprises a ninth laser configured to emit a ninth laser beam;

and

wherein the ninth laser beam emitted by the ninth laser is within wavelengths of the third color, and a ninth wavelength of the ninth laser beam is greater than the eighth wavelength of the eighth laser beam, and the ninth laser is positioned adjacent to at least one of the seventh laser or the eighth laser.

10. The laser array according to claim 7, wherein the first color is blue, the second color is red, and the third color is green.

11. The laser array according to claim 1, wherein the at least one line of lasers comprises at least six light-emitting chips.

12. The laser array according to claim 1, wherein a top surface of the reflective protrusion away from the metal substrate has an area less than that of a bottom surface of the reflective protrusion joined with the metal substrate.

13. The laser array according to claim 1, wherein the at least one line of lasers comprises a plurality of lines of light-emitting chips, the reflective protrusion comprises a plurality of side surfaces, and each line of light-emitting chips corresponds to a corresponding one of the plurality of side surfaces.

14. A laser projection device, comprising:

a laser light source;

an imaging element configured to receive a laser beam emitted by the laser light source and generate a projection beam according to a received video signal;

a projection lens configured to project the projection beam onto a display surface to display an image;

wherein, the laser light source comprises;

a laser array comprising a metal substrate, a reflective protrusion and at least one line of lasers, wherein the reflective protrusion is fixedly connected to the metal substrate, and the reflective protrusion is configured to reflect light towards a direction opposite to the metal substrate;

wherein the at least one line of lasers comprises at least two first lasers and a second laser, wherein the second laser is positioned between the two first lasers;

wherein the at least two first lasers are configured to emit a first laser beam, and the second laser are configured to emit a second laser beam;

wherein the first laser beam and the second laser beam are both within wavelengths of a first color, and wherein a first wavelength of the first laser beam is less than a second wavelength of the second laser beam; and

wherein each laser in the at least one line of lasers comprises a light-emitting chip, and each light-emitting chip in the at least one line of lasers is fixedly connected to the metal substrate and configured to emit light towards the reflective protrusion;

at least one collimating lens set configured to collimate laser beams emitted from the laser array into collimated laser beams; and

at least one converging lens set configured to converge the collimated laser beams.

15. The laser projection device according to claim 14, wherein each laser in the line of lasers comprises a light-emitting chip;

and each of the at least one collimating lens set is correspondingly arranged at a light emitting side of each light-emitting chip.

16. A laser array comprising:

a metal substrate;

a metal strip fixed on the metal substrate;

a line of lasers, wherein each laser of the line of lasers comprises a light-emitting chip;

wherein the line of lasers comprises at least two first lasers and at least two second lasers, one of the at least two first lasers is positioned between two second lasers, and one of the at least two second lasers is positioned between two first lasers,

wherein the at least two first lasers are configured to emit a first laser beam, and at least two second lasers are configured to emit a second laser beam; and

wherein the first laser beam and the second laser beam are both within wavelengths of a blue color, and wherein a first wavelength of the first laser beam is less than a second wavelength of the second laser beam; and

wherein the light-emitting chip is fixedly connected to the metal strip, and the light-emitting chips are configured to emit light in a direction away from the metal substrate.

17. The laser array according to claim 16, wherein the metal strip includes a first surface facing and attached to the metal substrate, a second surface facing away from the metal substrate opposite to the first surface, and a side surface that is provided between the first surface to the second surface, and

wherein the light emitting chip is disposed on the side surface of the metal strip.