CN116107140A

CN116107140A - Laser, laser light source and laser projection device

Info

Publication number: CN116107140A
Application number: CN202111320370.XA
Authority: CN
Inventors: 颜珂; 李巍; 田有良
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2023-05-12

Abstract

The application discloses a laser instrument, laser light source and laser projection equipment belongs to the projection display field. The laser includes: the laser device comprises a substrate and a plurality of laser units arranged in an array on the substrate. In the present application, the laser includes two rows of laser units, one row of red laser units for emitting red laser light, the other row of green laser units for emitting green laser light, and blue laser units for emitting blue laser light. On the premise of ensuring the brightness of laser beams emitted by the laser, the number of laser units in the laser is reduced. Therefore, the whole volume of the laser can be effectively reduced, and the laser projection equipment integrated with the laser is smaller in volume.

Description

Laser, laser light source and laser projection device

Technical Field

The present disclosure relates to the field of projection display, and in particular, to a laser, a laser source, and a laser projection apparatus.

Background

With the development of photoelectric technology, requirements for projection pictures of laser projection devices are increasing. In order to ensure the display brightness of the projection picture, a laser is generally adopted to provide illumination for the laser projection equipment, and a laser beam emitted by the laser has the advantages of good monochromaticity and high brightness, so that the laser is an ideal light source.

Currently, the light emitted by laser projection devices is typically provided by a laser. As shown in fig. 1 and 2, fig. 1 is a schematic view of a structure of a laser provided in the related art, and fig. 2 is a schematic view of a distribution of laser units in the laser shown in fig. 1. The laser includes one row of light emitting chips for emitting blue laser light, one row of light emitting chips for emitting green laser light, and two rows of light emitting chips for emitting red laser light. For example, the number of light emitting chips for emitting laser light of different colors per row is seven.

However, the number of laser chips in the current laser is large, which results in a large overall size of the laser and thus a large size of the laser projection device.

Disclosure of Invention

The embodiment of the application provides a laser, a laser light source and a laser projection device. The problem of the great whole volume of laser instrument among the prior art can be solved, technical scheme is as follows:

in one aspect, a laser is provided, the laser comprising:

a substrate and a plurality of laser units arranged in an array on the substrate;

the laser units are arranged in two rows, and each laser unit in one row of laser units is a red laser unit for emitting red laser; and one part of the laser units in the other row of laser units are green laser units used for emitting green laser, the other part of the laser units are blue laser units used for emitting blue laser, and two laser units positioned at the end part in the other row of laser units are both the blue laser units.

In another aspect, there is provided a laser light source comprising: the device comprises a laser, a light converging lens group, a shaping lens group, a lens component and a light guide pipe. The laser is the laser given in the above.

The light combining lens group is positioned at the light emitting side of the laser, and the arrangement direction of the laser and the light combining lens group is perpendicular to the arrangement direction of the light combining lens group, the shaping lens group, the lens component and the light guide pipe;

the laser is used for emitting laser light with three colors to the light combining lens group;

the light combining lens group is used for combining the laser light with the three colors and guiding the laser light to the shaping lens group;

the shaping lens group is used for shaping the laser beam after light combination so that the width of the light spot of the laser beam after shaping in the slow axis direction of the laser is smaller than the width of the light spot of the laser beam before shaping in the slow axis direction;

the shaping lens group is also used for guiding the shaped laser beam to the lens component, and the lens component is used for adjusting the laser beam and guiding the adjusted laser beam to the light guide pipe.

In yet another aspect, there is provided a laser projection apparatus including: laser light source, light valve and projection lens. The laser light source is the laser light source given in the above.

The beneficial effects that technical scheme that this application embodiment provided include at least:

a laser, comprising: the laser device comprises a substrate and a plurality of laser units arranged in an array on the substrate. In the present application, the laser includes two rows of laser units, one row of red laser units for emitting red laser light, the other row of green laser units for emitting green laser light, and blue laser units for emitting blue laser light. On the premise of ensuring the brightness of laser beams emitted by the laser, the number of laser units in the laser is reduced. Therefore, the whole volume of the laser can be effectively reduced, and the laser projection equipment integrated with the laser is smaller in volume. In addition, when the end parts of the laser units in the line comprising the blue laser unit and the green laser unit are both blue laser units, the perception effect of human eyes after the laser light of three colors is combined can be effectively balanced, and the display effect of the laser projection device integrated with the laser is effectively improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a laser provided in the related art;

FIG. 2 is a schematic diagram of the distribution of laser units in the laser shown in FIG. 1;

fig. 3 is a schematic structural diagram of a laser according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of the distribution of laser units in the laser shown in FIG. 3;

FIG. 5 is a schematic diagram of another laser unit distribution provided in an embodiment of the present application;

FIG. 6 is a schematic diagram of another laser according to an embodiment of the present disclosure;

fig. 7 is a schematic view of a part of the structure of a laser light source according to an embodiment of the present application;

FIG. 8 is a graph showing the effect of the shaping lens set on shaping the laser beam according to the embodiment of the present application;

FIG. 9 is a top view of the laser light source shown in FIG. 7;

FIG. 10 is a schematic view of another laser source according to an embodiment of the present disclosure;

FIG. 11 is a schematic view of a structure of another laser light source according to an embodiment of the present disclosure;

FIG. 12 is a schematic view of a portion of another laser source according to an embodiment of the present disclosure;

fig. 13 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present application.

Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of a laser according to an embodiment of the present application, and fig. 4 is a schematic distribution diagram of laser units in the laser shown in fig. 3. The laser 000 may include: a substrate 100, and a plurality of laser units 200 arranged in an array on the substrate. The plurality of laser units 200 may be integrated in the laser 000 in an array arrangement, and the plurality of laser units 200 may be arranged in two rows in the laser 000 in an array arrangement. Of the two rows of laser units 200, each of the laser units 200 in one row of laser units 200 may be a red laser unit for emitting red laser light; a part of the laser units 200 in the other row of laser units 200 may be green laser units for emitting green laser light, and another part of the laser units 200 may be blue laser units for emitting blue laser light. And two laser units 200 located at the end among the one line of laser units for emitting green laser light and blue laser light are both blue laser units for emitting blue laser light.

In the application, the light emitting power range of the red laser unit may be 24W to 56W, the light emitting power range of the blue laser unit may be 48W to 115W, and the light emitting power range of the green laser unit may be 12W to 28W. The light emission power of the red laser unit is 48W, the light emission power of the blue laser unit is 82W, and the light emission power of the green laser unit is 24W, for example.

In the embodiment of the present application, when the laser 000 includes one line of red laser units for emitting red laser light, one line of green laser units for emitting green laser light, and blue laser units for emitting blue laser light, the number of laser units 200 in the laser 000 can be reduced on the premise of ensuring the brightness of the laser beam emitted by the laser 000. In this way, the overall volume of the laser 000 can be effectively reduced, thereby making the laser projection device integrated with the laser 000 smaller.

In addition, in the subsequent light receiving process by the light guide, the light receiving angle of the light guide causes a larger loss of the laser light at the end of each row of the laser 000 when the laser light is guided to the light guide. And the perception function of blue laser light is smaller than that of green laser light. Therefore, when the end portions of the laser units 200 including the blue laser unit and the green laser unit are both blue laser units, the perception effect of the human eyes after the laser light of the three colors is combined can be effectively balanced, and the display effect of the laser projection device integrated with the laser 000 is effectively improved. For example, the laser 000 for emitting three-color laser light in the present application may employ an MCL type laser.

In summary, the laser provided in the embodiment of the present application includes: the laser device comprises a substrate and a plurality of laser units arranged in an array on the substrate. In the present application, the laser includes two rows of laser units, one row of red laser units for emitting red laser light, the other row of green laser units for emitting green laser light, and blue laser units for emitting blue laser light. On the premise of ensuring the brightness of laser beams emitted by the laser, the number of laser units in the laser is reduced. Therefore, the whole volume of the laser can be effectively reduced, and the laser projection equipment integrated with the laser is smaller in volume. In addition, when the end parts of the laser units in the line comprising the blue laser unit and the green laser unit are both blue laser units, the perception effect of human eyes after the laser light of three colors is combined can be effectively balanced, and the display effect of the laser projection device integrated with the laser is effectively improved.

In the embodiment of the present application, please refer to fig. 5, fig. 5 is a schematic diagram illustrating a distribution of another laser unit according to the embodiment of the present application. The distance d between two adjacent laser units 200 in each row of laser units 200 in the laser 00 may be 1.3 to 3 millimeters. By way of example, the distance between two adjacent laser units 200 in each row of laser units 200 may be 1.5 millimeters. In this way, the distance between two adjacent laser units 200 in each row of laser units 200 is smaller, so that the overall volume of the laser 000 can be further effectively reduced.

Alternatively, among the line of laser units 200 for emitting green laser light and blue laser light, at least one blue laser unit 200a may be arranged between two blue laser units 200a located at the end. And the at least one blue laser unit 200a may be arranged between two green laser units 200b for emitting green laser light. In this way, the blue laser units 200a and the green laser units 200b are alternately arranged, so that the uniformity of light beams of the blue laser, the green laser and the red laser after the subsequent light combination by the light combining lens can be effectively improved.

In the related art, the laser 000 is used as a light source of the projection device to perform projection display, which generally generates a speckle effect. The speckle effect refers to the effect that two laser beams emitted by a coherent light source generate interference in space after being scattered by irradiating a rough object (such as a screen of a projection device), and finally, granular speckles with alternate brightness and darkness appear on the screen. Two adjacent light emitting chips emitting laser light with the same wavelength and constant phase in the laser are coherent light sources. The speckle effect makes the display effect of the projection image worse, and the unfocused spots with alternate brightness and darkness are in a flickering state in the view of human eyes, so that dizziness is easy to generate when the user looks for a long time, and the watching experience of the user is worse.

In the embodiment of the present application, in a row of red laser units 200c each emitting red laser light, the center wavelength of the red laser light emitted by the red laser units 200c may sequentially increase along the directions from both sides to the middle. Thus, for two adjacent light emitting chips whose center wavelengths of the emitted laser light are all within the same wavelength range, the center wavelengths of the laser light emitted by the two light emitting chips are different, so the two light emitting chips are not coherent light sources. Therefore, the laser emitted by the two light emitting chips is difficult to interfere, so that the speckle effect when the laser 000 is used as a light source of projection equipment for projection display can be reduced, the projected image is prevented from becoming flower, the display effect of the projected image is improved, and the dizziness caused by watching by human eyes is avoided. In addition, since the red laser unit 200c emitting the red laser light having a short center wavelength is sensitive to a change in temperature and generates a large amount of heat. A red laser unit 200c that emits red laser light having a shorter center wavelength is provided at an end of the row of laser units. Therefore, the heat emitted by the laser unit can be effectively emitted to the external environment, and the influence on other laser units is avoided as much as possible.

Alternatively, the red laser units 200c each emitting red laser light may include: at least one first red laser unit c1 located at a central region of a row of the red laser units 200c, and at least two second red laser units c2 located at both sides of the at least one first red laser unit c 1. The central wavelengths of the first red laser units c1 located in the central region may be the same. In the at least two second red laser units c2 located at both sides of the at least one first red laser unit c1, the center wavelengths of the two second red laser units c2, which are equal to the distance between the center regions, may be the same. For example, four second red laser units c2, namely, a second red laser unit c21 and a second red laser unit c22, may be included in the red laser unit 200c each emitting red laser light. For example, the center wavelength of the first red laser unit c1 may be 647 nanometers, the center wavelength of the second red laser unit c21 is 643 nanometers, and the center wavelength of the second red laser unit c22 is 639 nanometers.

In the embodiment of the present application, please refer to fig. 6, fig. 6 is a schematic structural diagram of another laser according to the embodiment of the present application. The laser 000 may also include three first conductive pins 300 and one second conductive pin 400 on the substrate 100. The three first conductive pins 300 on the substrate 100 may be connected to the first ends of the plurality of red laser units 200c, the plurality of green laser units 200b, and the plurality of blue laser units 200a, respectively. One second conductive pin 400 may be simultaneously connected to the second ends of the plurality of red laser units 200c, the plurality of green laser units 200b, and the plurality of blue laser units 200 a. One of the first conductive pin 300 and the second conductive pin 400 may be a positive electrode pin, and the other may be a negative electrode pin. In this application, when the first conductive pin 300 is an anode pin and the second conductive pin 400 is a cathode pin, the three first conductive pins 300 are respectively connected with the first ends of the plurality of red laser units 200c, the first ends of the plurality of green laser units 200b and the first ends of the plurality of blue laser units 200 a. The second conductive pin 400 is simultaneously connected to the second ends of the plurality of red laser units 200c, the plurality of green laser units 200b, and the plurality of blue laser units 200a, which are connected in series. I.e., the plurality of red laser units 200c in series, the plurality of green laser units 200B in series, and the plurality of blue laser units 200a in series share one negative pin, e.g., (R, G, B) -, r+, g+, b+. When the first conductive pin 300 is a negative electrode pin and the second conductive pin 400 is a positive electrode pin, the three first conductive pins 300 are respectively connected with the first ends of the plurality of red laser units 200c, the first ends of the plurality of green laser units 200b and the first ends of the plurality of blue laser units 200 a. The second conductive pin 400 is simultaneously connected to the second ends of the plurality of red laser units 200c, the plurality of green laser units 200b, and the plurality of blue laser units 200a, which are connected in series. That is, the plurality of red laser units 200c in series, the plurality of green laser units 200B in series, and the plurality of blue laser units 200a in series share one positive electrode pin, for example, (R, G, B) +, R-, G-, B-, which are not limited in the embodiments of the present application. In this way, the laser 000 simplifies the packaging process of the laser 000 while reducing the manufacturing cost of the laser 000 by sharing the positive or negative electrode pins.

Exemplary. The red light laser unit 200c, the green light laser unit 200b and the blue light laser unit 200a are respectively connected with one ends of the first conductive pin 300 and the second conductive pin 400, and the first conductive pin 300 and the second conductive pin 400 are used for transmitting signals to enable the laser units 200 emitting different colors to emit light, and the other ends of the first conductive pin 300 and the second conductive pin 400 extend to the outer side of the substrate 100. The first conductive pin 300 and the second conductive pin 400 are further used for connecting with a circuit board (not shown in the figure) in the laser projection device to conduct the laser unit 200 and the circuit board, so that the light emitting chip of the laser unit 200 emits light.

Alternatively, each of the plurality of laser units 200 may include one light emitting chip, that is, the laser 000 may include a plurality of light emitting chips arranged in an array. Each row of the light emitting chips is used for emitting laser light with different colors. In this application, the laser 000 includes light emitting chips arranged in two rows and seven columns, wherein one row of light emitting chips is used to emit red laser light and one row of light emitting chips is used to emit green laser light and blue laser light. For example, the number of red laser units 200c may be seven, the number of green laser units 200b may be four, and the number of blue laser units 200a may be three. In other possible implementations, the plurality of light emitting chips may be arranged in other arrangements, which is not limited in this embodiment of the present application.

In general, a plurality of laser units of a laser in a laser light source emit laser light to a light converging lens group, a spot formed by combining laser beams reflected by the light converging lens group is generally rectangular in shape, and a width of the spot in a slow axis direction of the laser light (i.e., a size of a long side of the spot) is larger than a width in a fast axis direction of the laser light (i.e., a size of a short side of the spot). For example, the ratio of the size of the long side to the size of the short side of the spot formed by combining the laser beams is 3:1.

As can be seen from the calculation formula of the etendue in the optical principle, the calculation formula of the etendue of the illumination of the laser projection apparatus is:

π×S×(SinQ) ² ；

where S is the area of the light receiving surface of the light valve in the laser projection device, where the light receiving surface of the light valve is generally rectangular, and therefore, the area S of the light receiving surface of the light valve can be represented by the product of the width H1 of the long side and the width H2 of the short side of the light receiving surface; q is the outgoing angle of the laser beam passing through the projection lens in the laser projection device, and after the model of the projection lens is determined, the value of F# of the projection lens is determined, so that the outgoing angle Q of the laser beam passing through the projection lens can be determined according to F# of the projection lens, wherein the relation between F# and Q is as follows: q=1/2f#.

That is, the expansion amount calculation formula of the illumination of the laser projection apparatus is:

π×H1×H2×Sin ² (1/2F#)；

according to the above formula, after the model of the light valve and the model of the projection lens are determined, the expansion of the illumination of the laser projection device is determined, and the lagrangian invariant of the corresponding long side and short side is determined. However, since the laser beam emitted from the laser 000 is combined with the light by the light-combining lens to form a spot having a longer side dimension than a shorter side dimension, the exit angle of the laser beam directed to the light guide in the longer side direction of the spot is larger than the exit angle of the spot in the shorter side direction. As such, the lagrangian invariant for at least one of the long and short sides of the spot is unsatisfactory.

For example, the Lagrangian invariant formula is as follows:

n×SinQ×Y＝n'×SinQ'×Y'；

where n and n ' are the refractive indices of the transmission medium, in a laser projection device, both n and n ' may be the refractive indices of air, so n=n '; q is the emergent angle of the laser beam passing through a projection lens in the laser projection equipment; y is the image height of the imaging object; q 'is the incident angle of the laser beam to the projection lens, and the laser beam in the laser source is emitted from the light guide tube and then emitted to the projection lens after multiple reflections, so Q' can be represented by the emitting angle of the light guide tube; y' is the object height of the imaged object.

Since the aspect ratio of the imaging picture of the laser beam passing through the projection lens is the same as the aspect ratio of the light receiving surface of the light valve. Therefore, according to the Lagrangian invariant formula, the expression of the long side of the light spot after exiting through the projection lens can be: the expression of n×sin (1/2f#) ×h1, where the short side of the light spot exits through the projection lens, may be: n×sin (1/2f#) ×h2. The expression of the long side of the light spot when the light spot is shot to the projection lens can be: n '×sin (Q1')×d1, the expression of the short side of the light spot when it is directed to the projection lens may be: n '×sin (Q2')×d2. Wherein d1 is the size of the long side of the light spot formed after the laser beams are combined, and d2 is the size of the short side of the light spot formed after the laser beams are combined; q1 'is the exit angle of the laser beam directed to the light guide 03 in the long side direction of the spot, and Q2' is the exit angle of the laser beam directed to the light guide in the short side direction of the spot.

In order to ensure that the laser projection device has high light extraction efficiency, the long side of the light spot is required to meet Lagrange invariant. That is, it is necessary to secure k×sin (1/2f#) ×h1=sin (Q1')×d1. Where k is a constant.

Q1 'and Q2' in the above expression satisfy the following relation:

wherein D1 is the width of the long side of the light guide, D2 is the width of the short side of the light guide, and F is the focal length of the light guide. In a laser light source, the light valve needs to correspond to a light guide. That is, the aspect ratio of the light guide needs to be approximately the same as the aspect ratio of the light receiving surface of the light valve. Thus, it can be derived from the above relation: the ratio between Q1 'and Q2' is approximately equal to H1: H2.

as is clear from the above, since the size of the long side of the spot formed after the laser beam is combined is larger than the size of the short side, when kxsin (1/2f#) ×h1=sin (Q1 ')×d1, kxsin (1/2f#) ×h2 > Sin (Q2')×d2. Therefore, the expansion loss of the laser beam in the short side direction of the light spot is large, and the transmission efficiency of the light valve in the laser light source to the laser beam emitted by the laser is low.

Referring to fig. 7, fig. 7 is a schematic view of a part of a laser light source according to an embodiment of the present application. The laser light source 00 may include: a laser 000, a combiner lens set 001, a shaper lens set 002, a lens assembly 003, and a light pipe 004. The laser 000 may be a laser light source as shown in fig. 3, 5 or 6.

The light combining lens set 001 may be located at the light emitting side of the laser 000, and the arrangement direction (such as the Y-axis direction in fig. 7) of the laser 000 and the light combining lens set 001 is perpendicular to the arrangement direction (such as the X-axis direction in fig. 7) of the light combining lens set 001, the shaping lens set 002, the lens assembly 003 and the light guide 004.

Wherein the laser 000 in the laser light source 00 can be used to emit laser light of three colors to the light combining lens group 001. By way of example, three colors of laser light may include: blue laser, green laser, and red laser. In addition, the embodiments in the present application are each schematically described by taking as an example laser light of three colors of laser light 000 which emits blue laser light, green laser light, and red laser light at the same time.

In this application, after the laser beam emitted by the laser 000 is directed to the beam combining lens set 001, the beam combining lens set 001 reflects the laser beam to the shaping lens set 002, and after the shaping lens set 002 shapes the laser beam, the laser beam is directed to the lens assembly 003, and the lens assembly 003 is used for adjusting the received laser beam and directing the adjusted laser beam to the light guide 004. Thus, the laser light source 00 can shape the laser beam after the light combination of the light combination lens set 001 through the shaping lens set 002, so that the width of the light spot of the shaped laser beam in the slow axis direction of the laser is smaller, and further, the difference between the width of the light spot of the shaped laser beam in the slow axis direction of the laser and the width of the light spot of the shaped laser beam in the fast axis direction of the laser (i.e. the size of the short side of the light spot) is smaller. Thus, the expansion loss of the laser beam in the short side direction of the light spot can be effectively reduced, and the transmission efficiency of the light valve in the laser light source to the laser beam emitted by the laser 000 is further improved.

In this embodiment of the present application, the width of the spot of the laser beam after the shaping lens set 002 shapes the laser beam in the slow axis direction of the laser may be equal to the width of the spot of the laser beam after the shaping lens set 002 shapes the laser beam in the fast axis direction of the laser. That is, the ratio between the width of the spot of the laser beam after shaping the laser beam by the shaping mirror group 002 in the slow axis direction of the laser and the width of the spot of the laser beam after shaping the laser beam by the shaping mirror group 002 in the fast axis direction of the laser may be 1. For example, when k×sin (1/2f#) ×h1=sin (Q1 ')×d1, since the value of d1:d2 is 1, k×sin (1/2f#) ×h2=sin (Q2')×d2 can be satisfied. Therefore, the expansion loss of the laser beam in the short side direction of the light spot can be further effectively reduced, and the transmission efficiency of the light valve in the laser light source to the laser beam emitted by the laser is further improved.

The light pipe 004 in this application is a rectangular tubular device that is formed by four plane reflector plates concatenation, also is hollow light pipe promptly, and light is at light pipe 004 inside multiple reflection, reaches the effect of even light, and the light pipe also can adopt solid light pipe, and light pipe 004's light inlet and light outlet are the rectangle that shape area is unanimous, and the light beam gets into from light pipe 004's light inlet, and the light valve subassembly is got into from light pipe 004's light outlet again, accomplishes light beam homogenization and facula optimization at the in-process through light pipe 004.

Beam homogenization refers to shaping a beam of unevenly distributed intensity into a beam of evenly distributed cross-section by beam transformation. Speckle refers to the interference of these beams to form bright or dark spots when a laser light source is used to illuminate, for example, a rough surface of a screen or any other object that produces diffuse reflection or diffuse transmission of light, producing a random granular intensity pattern.

Alternatively, please refer to fig. 9, fig. 9 is a top view of the laser light source shown in fig. 7. The shaping lens set 002 in the laser light source 00 may have a first cylindrical arc surface a and a second cylindrical arc surface B. The first cylindrical arc surface a may be close to the light converging lens group 001 with respect to the second cylindrical arc surface B.

The shaping lens set 002 may be used to converge the laser beam after light combination in the slow axis direction of the laser through the first cylindrical arc surface a, and the shaping lens set 002 may also be used to collimate the laser beam after light combination through the second cylindrical arc surface B, so as to obtain the laser beam after shaping by the shaping lens set 300.

In the embodiment of the present application, referring to fig. 9 and 10, fig. 10 is a schematic structural diagram of another laser light source provided in the embodiment of the present application. The shaping lens set 002 in the laser light source 00 may include: two cylindrical lenses. By way of example, the two cylindrical lenses may be respectively: a first cylindrical lens 0021 and a second cylindrical lens 0022. The first cylindrical lens 0021 is a cylindrical lens of the two cylindrical lenses, which is close to the light converging lens group 001, and the second cylindrical lens 0022 is a cylindrical lens of the two cylindrical lenses, which is close to the light guide 004.

The arrangement direction (e.g., X-axis direction in fig. 7) of the first cylindrical lens 0021 and the second cylindrical lens 0022 may be perpendicular to the arrangement direction (e.g., Y-axis direction in fig. 7) of the laser 000 and the light combining lens set 001, and the first cylindrical lens 0021 of the two cylindrical lenses in the shaping lens set 002, which is close to the light combining lens set 001, may have a first cylindrical arc surface a, and the second cylindrical lens 0022 of the two cylindrical lenses, which is close to the light guide, may have a second cylindrical arc surface B.

Referring to fig. 9 and fig. 10, the light incident surface of the first cylindrical lens 0021, that is, the first cylindrical arc surface a may be a cylindrical convex transmission surface, and the light emergent surface of the first cylindrical lens 0021 may be a plane; the light incident surface of the second cylindrical lens 0022, that is, the second cylindrical arc surface B may be a cylindrical concave penetrating surface, and the light emergent surface of the second cylindrical lens 0022 may be a plane. Thus, when the laser beam passes through the first cylindrical lens 0021, the first cylindrical lens 0021 can converge the laser beam in the slow axis direction of the laser, that is, the width of the light spot of the laser beam after combining the laser beam in the slow axis direction of the laser is the same as the width of the light spot of the laser beam after combining the laser beam in the fast axis direction of the laser. The second cylindrical lens 0022 may collimate the laser beam emitted from the first cylindrical lens 0021 and guide the collimated laser beam to the light guide 004.

The laser light source 00 may further include: a plane mirror 005, the plane mirror 005 may be located between the two cylindrical lenses, and the plane mirror 005 may be used to adjust the direction of the laser beam emitted from the cylindrical lens close to the light combining lens group 001 among the two cylindrical lenses to be directed toward the cylindrical lens close to the light guide 004 among the two cylindrical lenses.

When the space in the projection apparatus is small, for example, the shaping lens set 002 and the lens assembly 003 cannot be accommodated in the central axis direction (X-axis direction in fig. 10) of the light converging lens set 001, the positions of the shaping lens set 002 and the lens assembly 003 may be adjusted, and then under the action of the plane mirror 005, the direction of the laser beam emitted from the cylindrical lens in the shaping lens set 002 near the light converging lens set 001 is adjusted to be directed toward the cylindrical lens in the shaping lens set 002 near the light guide 004, and the laser beam is shaped by the cylindrical lens and then directed to the lens assembly 003.

In the embodiment of the present application, the light combining lens group 001 may include: the first lens 0011 and the second lens 0012 are sequentially arranged in the X-axis direction in fig. 10. On a plane parallel to the light emitting surface of the first cylindrical lens 0021, the orthographic projection of the first lens 0011 and the orthographic projection of the second lens 0012 are at least partially overlapped. Thus, the laser 000 is configured to emit a laser beam toward the first lens 0011 and the second lens 0012. The laser beam may include three colors of laser light (e.g., blue laser light, green laser light, and red laser light), among others. For example, the laser 000 may be used to emit blue and green laser light to the first lens 0011, and the first lens 0011 may be used to reflect the blue and green laser light toward the shaping lens set 002; the laser 000 can be used to emit red laser light to the second lens 0012, and the second lens 0012 can be used to reflect the red laser light toward the shaping lens set 002.

By way of example, the first lens 0011 in the light combining lens group 001 may be a mirror for reflecting laser light of all colors, or may be a dichroic sheet for reflecting green laser light and blue laser light and transmitting laser light of other colors; the second lens 0012 in the light combining lens group 001 may be a dichroic sheet for reflecting red laser light and transmitting laser light of other colors.

Optionally, referring to fig. 11, fig. 11 is a schematic structural diagram of another laser light source according to an embodiment of the present application. The laser light source 00 may further include: a diffuser 006. The diffuser 006 may be located between the shaping assembly 002 and the lens assembly 003. The laser beam emitted from the shaping module 300 may be directed to the diffuser 006 along the X-axis direction in fig. 10, and the diffuser 006 may homogenize the incident laser beam and then direct it to the lens module 003.

Since the light source is a pure three-color laser light source, speckle is a phenomenon peculiar to laser, and further processing of resolving the speckle is required for obtaining higher projection picture display quality. In this application, a diffuser wheel 007, i.e., a rotating diffuser, is also provided between the lens assembly 003 and the light pipe 004. The diffusion wheel can diffuse the light beam in a converging state, increases the divergence angle of the light beam and increases the random phase. Thus, since the homogenizing diffusion sheet 006 is provided in the front optical path, the laser beam is homogenized, converged by the lens assembly 003, and incident on the diffusion wheel 007. The laser beam passes through a static diffusion sheet 006 and then a moving diffusion sheet 007, so that on the basis of homogenizing the laser beam by the static diffusion sheet 006, the homogenizing effect of the laser beam can be enhanced, the energy ratio of the beam near the optical axis of the laser beam is reduced, the coherence degree of the laser beam is reduced, and the speckle phenomenon appearing on a projection picture can be improved to a greater extent.

In the embodiment of the present application, the polarization polarities of the blue laser light and the green laser light emitted from the laser 000 are opposite to the polarization polarity of the red laser light. For example, blue laser light and green laser light are S polarized light, and red laser light is P polarized light. For this reason, referring to fig. 12, fig. 12 is a schematic view of a part of the structure of still another laser light source according to an embodiment of the present application. The laser light source 00 may further include: half wave plate 008. The half-wave plate 008 may be located between the laser 000 and the first lens 0011, and the half-wave plate 008 may be used to convert the incident blue laser light and green laser light from S polarized light to P polarized light, and then direct the converted light to the first lens 0011, so that the polarization directions of the blue laser light and the green laser light incident into the light guide 004 are the same as the polarization direction of the red laser light. In this way, the projection picture is formed by adopting the laser with the uniform polarization direction, and the problem that color blocks exist in the formed projection picture due to different transmission and reflection efficiencies of the optical lenses to different polarized lights can be avoided.

In the above-provided embodiment, by providing the half-wave plates in the light-emitting paths of the blue laser and the green laser, when the half-wave plates with corresponding wavelengths are provided for the blue laser and the green laser respectively, the polarization directions of the blue laser and the green laser can be changed by 90 degrees, in this example, the polarization direction of the blue laser and the green laser is changed from the polarization direction of the S light to the polarization direction of the P light, and the polarization direction of the P light is consistent with the polarization direction of the red laser, so that when the blue laser and the green laser which become P polarized light pass through the same optical imaging system and are reflected into human eyes through the projection screen, the transmittance of the blue laser and the green laser which become P polarized light in the optical lens is equivalent to the transmittance of the red laser which is P light, the consistency of the light processing process is close, and the reflectance difference of the projection screen to the three-color laser is also reduced, the consistency of the light processing process of the three-color primary light is improved, the color cast phenomenon of the partial area on the projection screen is eliminated fundamentally, and the display quality of the projection screen is improved.

In addition, since the transmittance of the optical lens for P polarized light is generally greater than the transmittance for S polarized light in the optical system, and the reflectance of the projection screen applied in this example for P polarized light is also greater than the reflectance for S polarized light, by converting the blue laser and the green laser of S polarized light into P polarized light, the red, green, and blue lasers are P light, and the light transmission efficiency of the projection beam in the entire system can be improved, the brightness of the entire projection screen can be improved, and the projection screen quality can be improved.

In summary, the laser provided in the embodiment of the present application includes: the laser device comprises a substrate and a plurality of laser units arranged in an array on the substrate. In the present application, the laser includes two rows of laser units, one row of red laser units for emitting red laser light, the other row of green laser units for emitting green laser light, and blue laser units for emitting blue laser light. On the premise of ensuring the brightness of laser beams emitted by the laser, the number of laser units in the laser is reduced. Therefore, the whole volume of the laser can be effectively reduced, and the volume of the laser projection equipment is smaller. The end portions of the laser units in the line including the blue laser unit and the green laser unit are both blue laser units. Thus, the perception effect of human eyes after laser light combining of three colors can be effectively improved.

Fig. 13 is a schematic structural diagram of a laser projection apparatus according to an embodiment of the present application. The laser projection device may include: a laser light source 00, a lens group 01, a prism group 02, a light valve 03 and a projection lens 04. The laser light source 000 may be the laser light source shown in fig. 7, 10, 11, or 12. Fig. 11 illustrates an example in which the laser projection apparatus includes the laser light source 000 shown in fig. 11.

The lens group 01 may be located on a side of the light pipe 004 remote from the light combining lens group 001, and the prism group 02 and the light valve 03 may be located on a side of the lens group 01 remote from the light pipe 004. Wherein the lens group 01 may be used to guide the laser beam exiting the light pipe 004 to the prism group 02, the prism group 02 may include: total internal reflection (english: total Internal Reflectionprism, abbreviated as TIR) prisms. The prism assembly 02 may be used to direct the laser beam to the light valve 03. The light valve 03 may be used to modulate the laser beam to the projection lens 04.

For example, the light valve 03 may include a plurality of reflective sheets (not shown in the figure), each of which may be used to form a pixel in the projection screen, and the light valve 03 may reflect the laser light to the projection lens 04 by using the reflective sheet corresponding to the pixel to be displayed in a bright state according to the image to be displayed, so as to modulate the laser beam. By way of example, the light valve 03 may be a digital micromirror device (English: digital Micromirror Device; DMD for short).

The laser beam emitted from the laser 000 may be directed to the light guide 004 along the Z-axis direction in fig. 13, the light guide 004 may homogenize the incident laser beam and then direct the homogenized laser beam to the lens group 01, the lens group 01 may be used to guide the laser beam emitted from the light guide 004 to the prism group 02, the prism group 02 may be used to guide the laser beam to the light valve 03, the light valve 03 may be used to modulate the laser beam and then guide the modulated laser beam to the projection lens 04, and the projection lens 04 may project the incident laser beam to form a projection screen. The projection lens 04 may include a plurality of lenses (not shown in the figure), and the laser light emitted from the light valve 03 may sequentially pass through the plurality of lenses in the projection lens 04 to be emitted to the screen, so as to achieve projection of the laser light by the projection lens 04, and achieve display of a projection screen.

In this embodiment, through setting up plastic mirror group 002 in laser source 00, laser source can be through plastic mirror group 002 to the light beam shaping after the light beam combining of plastic mirror group 001 for the width of the facula of the laser beam after the plastic is less in the slow axis direction of laser, and then the difference between the width of the facula of laser beam after the plastic mirror group 002 in the slow axis direction of laser and the width of the facula of laser beam after the plastic in the fast axis direction of laser is less. Thus, the expansion loss of the laser beam in the short side direction of the light spot can be effectively reduced. And the interference generated by the laser used for projection is weaker, so that the speckle effect of the laser projection equipment during projection display can be weakened, the projected image is prevented from becoming flower, the display effect of the projected image is improved, and the dizziness caused by watching by human eyes is avoided.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless explicitly defined otherwise.

The foregoing description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, since it is intended that all modifications, equivalents, improvements, etc. that fall within the spirit and scope of the invention.

Claims

1. A laser, comprising: a substrate and a plurality of laser units arranged in an array on the substrate;

2. The laser according to claim 1, characterized in that in the other row of laser units, at least one blue laser unit is arranged between two blue laser units located at the end, and the at least one blue laser unit is arranged between two green laser units.

3. The laser according to claim 1, wherein in one row of the red laser units, the center wavelength of the red laser light emitted from the red laser unit increases in order in a direction from both sides to the middle.

4. A laser as claimed in claim 3 wherein a row of said red laser units comprises: at least one first red laser unit located in the central region, and at least two second red laser units located at both sides of the at least one first red laser unit;

the center wavelength of each first laser unit is the same; of the at least two second red laser units, the two second red laser units having the same center wavelength as the distance between the center regions are identical.

5. The laser of any one of claims 1 to 4, further comprising: three first conductive pins and one second conductive pin on the substrate;

the three first conductive pins are respectively connected with the first ends of the plurality of red laser units, the first ends of the plurality of green laser units and the first ends of the plurality of blue laser units which are connected in series;

The second conductive pin is connected with the second ends of the plurality of red laser units, the second ends of the plurality of green laser units and the second ends of the plurality of blue laser units in series;

one of the first conductive pin and the second conductive pin is an anode pin, and the other is a cathode pin.

6. The laser according to any one of claims 1 to 4, wherein the number of the red laser units is seven, the number of the green laser units is four, and the number of the blue laser units is three.

7. A laser light source, comprising: the laser, combiner lens assembly, shaper lens assembly and light pipe of any one of claims 1 to 6;

8. The laser light source of claim 7, wherein the shaping lens set has a first cylindrical arc surface and a second cylindrical arc surface, the first cylindrical arc surface being proximate to the combiner lens set relative to the second cylindrical arc surface;

the shaping lens group is used for converging the laser beams after light combination in the slow axis direction through the first cylindrical cambered surface, and is also used for collimating the laser beams after light combination through the second cylindrical cambered surface so as to obtain the laser beams after shaping.

9. The laser light source of claim 8, wherein the shaping lens set comprises: the arrangement direction of the two cylindrical lenses is perpendicular to the arrangement direction of the laser and the light converging lens group, the cylindrical lens, close to the light converging lens group, of the two cylindrical lenses is provided with the first cylindrical cambered surface, and the cylindrical lens, close to the light guide, of the two cylindrical lenses is provided with the second cylindrical cambered surface;

The laser light source further includes: the plane reflecting mirror is positioned between the two cylindrical lenses and is used for adjusting the direction of the laser beam emitted by the cylindrical lens, which is close to the light converging lens group, of the two cylindrical lenses to be towards the cylindrical lens, which is close to the light guide tube, of the two cylindrical lenses.

10. A laser projection device, comprising: the laser light source, light valve and projection lens of any one of claims 7 to 9.