CN116413986A - Light source system and laser projection apparatus - Google Patents

Abstract

The application discloses a light source system and laser projection equipment belongs to projection technical field. The light source system includes: the light emitting assembly comprises two rows of laser chips, and the size of the light emitting assembly in the row direction perpendicular to the two rows of laser chips can be made smaller, so that the light emitting assembly can be conveniently installed, and the size of a light source system in the row direction perpendicular to the two rows of laser chips can be reduced; and, the first line of laser chips in two lines of laser chips includes at least two red laser chips, and the second line of laser chips includes at least one green laser chip and at least one blue laser chip, so, the light combination subassembly in this light source system combines the light to two light beams that two lines of laser chips sent to make the light path of light source system comparatively succinct, and then can further make the size of this light source system less.

Description

Light source system and laser projection apparatus

Technical Field

The present application relates to the field of projection technologies, and in particular, to an illumination system and a laser projection device.

Background

At present, the laser projection display technology is a novel projection display technology in the current market, and compared with a light-emitting diode (LED) projection product, the laser projection display technology has the characteristics of clear imaging, bright color and higher brightness, and the obvious characteristics gradually enable the laser projection display technology to become the development direction of another main stream in the market.

A light source system for a laser projection device for providing a desired image beam to the laser projection device, the light source system comprising: a blue laser chip assembly and a green laser chip assembly mounted in parallel, and a red laser chip assembly perpendicular to the two laser chip assemblies; the light source system further comprises a first light converging lens, a second light converging lens and a third light converging lens which are respectively arranged corresponding to the three-color laser chip assemblies and are used for converging light beams emitted by the three-color laser chip assemblies.

However, the optical path of the light source system is complicated, resulting in a large size of the light source system.

Disclosure of Invention

The embodiment of the application provides a light source system and a laser projection device. The technical scheme is as follows:

according to a first aspect of the present application, there is provided a light source system comprising:

the light emitting component, the light combining component and the light path component;

the light emitting assembly comprises two rows of laser chips;

a first one of the two rows of laser chips comprises at least two red laser chips;

the second of the two rows of laser chips comprises at least one green laser chip and at least one blue laser chip;

the light emitting component is used for providing light beams for the light combining component, the light combining component is used for combining the light beams provided by the light emitting component and guiding the combined light beams to the light path component, and the light path component is used for guiding the light beams provided by the light combining component out of the light source system;

the light beams emitted by the at least two red laser chips received by the light combining component are in a first polarization direction, and the light beams emitted by the at least one green laser chip and the at least one blue laser chip received by the light combining component are in a second polarization direction.

Optionally, the second row of laser chips has at least one of the blue laser chips at an edge in the row direction.

Optionally, the number of green laser chips in the second row of laser chips is greater than the number of blue laser chips.

Optionally, the light combining component includes a first light combining unit and a second light combining unit, where the first light combining unit and the second light combining unit are in one-to-one correspondence with the two rows of laser chips, and an arrangement direction of the first light combining unit and the second light combining unit is parallel to an arrangement direction of the two rows of laser chips.

Optionally, the light path component includes a beam shrinking lens group, and the beam shrinking lens group includes: the first cylindrical lens is used for receiving the light beam provided by the light emitting assembly and guiding the light beam to the second cylindrical lens.

Optionally, the first cylindrical lens is a plano-convex cylindrical lens, the second cylindrical lens is a plano-concave cylindrical lens or a plano-convex cylindrical lens, and the focal point of the second cylindrical lens coincides with the focal point of the first cylindrical lens.

Optionally, the light spot of the light beam emitted by the light emitting component is a rectangular light spot, and the long side of the rectangular light spot is perpendicular to the generatrix of the cylindrical surface of the first cylindrical lens.

Optionally, the optical path component further includes a first reflecting mirror, and the first cylindrical lens, the first reflecting mirror and the second cylindrical lens are sequentially arranged along the optical path direction.

Optionally, the first light combining unit includes a second reflecting mirror, the second light combining unit includes a half mirror, the second reflecting mirror is configured to receive the light beam emitted by the first row of laser chips, reflect the light beam emitted by the first row of laser chips to the half mirror, and the half mirror is configured to receive and reflect the light beam emitted by the second row of laser chips, and is further configured to transmit the light beam emitted by the first row of laser chips.

According to another aspect of the present application, there is provided a laser projection apparatus including: the light source system comprises the light source system, the optical-mechanical system and the projection lens.

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

there is provided a light source system including: the light emitting assembly comprises two rows of laser chips, and the size of the light emitting assembly in the row direction perpendicular to the two rows of laser chips can be made smaller, so that the light emitting assembly can be conveniently installed, and the size of a light source system in the row direction perpendicular to the two rows of laser chips can be reduced; and, the first line of laser chips in two lines of laser chips includes at least two red laser chips, and the second line of laser chips includes at least one green laser chip and at least one blue laser chip, so, the light combination subassembly in this light source system combines the light to two light beams that two lines of laser chips sent to make the light path of light source system comparatively succinct, and then can further make the size of this light source system less. The problems of relatively complex light path and relatively large size of the light source system in the related art can be solved, and the effects of simplifying the light path of the light source system and reducing the size of the light source system are achieved.

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 light source system according to an embodiment of the present disclosure;

fig. 2 is a schematic structural view of the light source system shown in fig. 1, looking at the light source system along a direction perpendicular to the light emitting surface of the light emitting component;

FIG. 3 is a schematic diagram of the light source system shown in FIG. 1, looking at the light emitting assembly along a direction perpendicular to the light emitting surface of the light emitting assembly;

fig. 4 is a schematic structural diagram of a light emitting component according to an embodiment of the present disclosure;

fig. 5 is a schematic view of a light spot of a light beam emitted by a light emitting component according to an embodiment of the present application;

fig. 6 is a schematic view of a light spot of a light beam emitted from a beam condensing lens set according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a first cylindrical lens according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of another light source system according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a laser projection device 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. 1, fig. 2 and fig. 3, fig. 1 is a schematic structural diagram of a light source system according to an embodiment of the present application, fig. 2 is a schematic structural diagram of the light source system shown in fig. 1 looking at the light source system along a direction perpendicular to a light emitting surface of the light emitting component, and fig. 3 is a schematic structural diagram of the light source system shown in fig. 1 looking at the light emitting component along a direction perpendicular to the light emitting surface of the light emitting component. The light source system 10 may include: a light emitting element 11, a light combining element 12, and an optical path element 13.

The light emitting assembly 11 may include two rows of laser chips (a first row of laser chips 111 and a second row of laser chips 112 as shown in fig. 2).

The first row of laser chips 111 of the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112) may include at least two red laser chips 11R (the positions where the red laser chips 11R are located are identified in fig. 2 by the spots emitted from the red laser chips 11R). The second row of laser chips 112 of the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112) may include at least one green laser chip 11G (the position where the green laser chip 11G is located is identified in fig. 2 by a spot emitted from the green laser chip 11G) and at least one blue laser chip 11B (the position where the blue laser chip 11B is located is identified in fig. 2 by a spot emitted from the blue laser chip 11B). The red laser chip 11R may be used to emit a red laser beam, the green laser chip 11G may be used to emit a green laser beam, and the blue laser chip 11B may be used to emit a blue laser beam. In this embodiment of the present application, since the projection apparatus requires more components of the red laser beam when performing screen projection, the number of red laser chips 11R in the light emitting component 11 may be greater than the number of green laser chips 11G, and the number of red laser chips 11R may also be greater than the number of blue laser chips 11B, so that the light emitting component 11 may emit more red laser beams, and therefore the first row of laser chips 111 may include only red laser chips, the second row of laser chips 112 may include only green laser chips 11G and blue laser chips 11B, and the number of laser chips in the first row of laser chips 111 may be the same as the number of laser chips in the second row of laser chips 112, that is, the number of red laser chips 11R may be the sum of the number of green laser chips 11G and the number of blue laser chips 11B. By way of example, the number of red laser chips in the first row of laser chips 111 in the light emitting assembly 11 may be 7.

The light emitting component 11 may be used to provide a light beam to the light combining component 12, the light combining component 12 may be used to combine the light beam provided by the light emitting component 11 and guide the combined light beam to the light path component 13, and the light path component 13 may be used to guide the light beam provided by the light combining component 12 out of the light source system 10.

The light beams emitted by the at least two red laser chips 11R received by the light combining component 12 are in a first polarization direction, and the light beams emitted by the at least one green laser chip 11G and the at least one blue laser chip 11B received by the light combining component 12 are in a second polarization direction.

Compared with the prior art that the light emitting assembly comprises four rows of light emitting assembly laser chips, the light emitting assembly in the embodiment of the application can comprise two rows of laser chips, so that the light emitting assembly is smaller in size in the arrangement direction of the two rows of laser chips, and the light emitting assembly can be conveniently installed; more space can be reserved around the light emitting component 11 so as to facilitate setting other structures in the light source system 10, and illustratively, the placement positions of the structures such as a radiator, a fan, a circuit board and the like in the light source system are more flexible, and meanwhile, the size of the light source system 10 in the arrangement direction f1 of the two rows of laser chips is reduced, so that the size of the whole structure of the projection device comprising the light source system 10 in the arrangement direction of the two rows of laser chips is reduced, and the whole volume of the projection device is reduced.

And, a first of the two rows of laser chips includes at least two red laser chips, and a second of the two rows of laser chips includes at least one green laser chip and at least one blue laser chip. Therefore, the light combining component in the light source system combines the two light beams emitted by the two rows of laser chips, so that the light path of the light source system is simpler, and the size of the light source system can be smaller. The problems of relatively complex light path and relatively large size of the light source system in the related art can be solved, and the effects of simplifying the light path of the light source system and reducing the size of the light source system are achieved.

In summary, the embodiments of the present application provide a light source system, including: the light emitting assembly comprises two rows of laser chips, and the size of the light emitting assembly in the row direction perpendicular to the two rows of laser chips can be made smaller, so that the light emitting assembly can be conveniently installed, and the size of a light source system in the row direction perpendicular to the two rows of laser chips can be reduced; and, the first line of laser chips in two lines of laser chips includes at least two red laser chips, and the second line of laser chips includes at least one green laser chip and at least one blue laser chip, so, the light combination subassembly in this light source system combines the light to two light beams that two lines of laser chips sent to make the light path of light source system comparatively succinct, and then can further make the size of this light source system less. The problems of relatively complex light path and relatively large size of the light source system in the related art can be solved, and the effects of simplifying the light path of the light source system and reducing the size of the light source system are achieved.

Optionally, as shown in fig. 4, fig. 4 is a schematic structural diagram of a light emitting component according to an embodiment of the present application; the light emitting device 11 may be a multi-chip package (english: multi chip LD; abbreviated as MCL) laser device, i.e., a plurality of laser chips are packaged on a substrate to form a surface light source output. As shown in fig. 3, the light emitting assembly 11 may further include a substrate 113, and two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112) are packaged on the substrate 113, and the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112) may be connected in series, may be driven in parallel according to rows or columns, or may be driven in parallel according to different colors. The plurality of laser chips may be rectangular, or the plurality of laser chips may be in other shapes such as ellipse, which is not limited in this embodiment of the present application, the arrangement direction f1 of the two rows of laser chips in the light emitting assembly 11 may be parallel to the fast axis of the laser chips, that is, the plurality of laser chips may be arranged in one row along the slow axis direction of the laser chips, and two rows along the fast axis direction of the laser chips, as shown in fig. 3, the shape of the light spot emitted by the plurality of laser chips may be ellipse, the fast axis direction of the laser chips may be parallel to the extending direction of the long axis of the ellipse, and the slow axis direction of the laser chips may be parallel to the extending direction of the short axis of the ellipse.

Both sides of the substrate 113 in the row direction f2 of the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112) may have a plurality of pins, which may be electrically connected with a circuit board in the light source system to transmit an electrical signal to the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112), so that the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112) may be driven to emit light. The plurality of pins may include one positive electrode pin 1131 and three negative electrode pins (a first negative electrode pin 113R, a second negative electrode pin 113G and a third negative electrode pin 113B), and the red laser chip 11R, the green laser chip 11G and the blue laser chip 11B in the two rows of laser chips may share one positive electrode pin 1131, and the red laser chip 11R, the green laser chip 11G and the blue laser chip 11B may respectively have three negative electrode pins (a first negative electrode pin 113R, a second negative electrode pin 113G and a third negative electrode pin 113B) in one-to-one correspondence.

Alternatively, as shown in fig. 3, the edge of the second row of laser chips 112 in the row direction f2 has at least one blue laser chip 11B. Since the light emitting efficiency of the blue laser chip 11B is higher than that of the green laser chip 11G, and since the light beam emitted from the second row of laser chips 112 diverges during transmission, the optical lens in the light source system 10 has a certain light receiving range, which makes the loss of the light beam emitted from the laser chip located at the edge of the second row of laser chips 112 larger, the blue laser chip 11B can be disposed at the edge of the second row of laser chips 112, so that the overall efficiency of the light emitting assembly is higher.

Alternatively, the number of green laser chips 11G in the second row of laser chips 112 may be greater than the number of blue laser chips 11B. When the size of the light emitting element 11 is small, the number of blue laser chip pieces 11B having a good light emitting efficiency can be reduced, and thus, the number of laser chips in the light emitting element 11 can be reduced without affecting the light emitting effect of the light emitting element 11.

As shown in fig. 3, the number of red laser chips 11R in the first row of laser chips 111 is 7, the number of green laser chips 11G is 4, and the number of blue laser chips 11B is 3, so that the losses of the laser beams of each color in the transmission process can be balanced better under different optical characteristics of the laser chips of three colors based on the arrangement situation of the laser chips in fig. 3, so that the power ratios of the laser beams of three colors are close to a preset value, unbalance of the power ratios of the laser beams of three colors is avoided, and the color ratios conforming to the theoretical design can be realized.

Alternatively, as shown in fig. 1, the light combining assembly 12 may include a first light combining unit 121 and a second light combining unit 122, where the first light combining unit 121 and the second light combining unit 122 are in one-to-one correspondence with two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112), and an arrangement direction of the first light combining unit 121 and the second light combining unit 122 is parallel to an arrangement direction f1 of the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112). That is, the first light combining unit 121 may receive the red laser light beam emitted from the red laser chip 11R in the first row of laser chips 111, and the second light combining unit 122 may receive the green laser light beam emitted from the green laser chip 11G and the blue laser light beam emitted from the blue laser chip 11B in the second row of laser chips 112.

The light combining component 12 can combine the received red, green and blue laser beams into a white beam. The light combining component 12 converges the laser beams with three colors into a white beam through the first light combining unit 121 and the second light combining unit 122, and compared with the related art, the light combining component comprises three or more light combining units, and the light path of the light combining component 12 in the embodiment of the application is simpler, and the optical structure is simpler, so that the light path of the light source system 10 is simpler, and the size of the light source system 10 is further smaller.

Alternatively, as shown in fig. 1 and 2, the optical path assembly 13 may include a beam shrinking lens group 131, and the beam shrinking lens group 131 may include: a first cylindrical lens 1311 and a second cylindrical lens 1312, the first cylindrical lens 1311 may be used to receive the light beam provided by the light emitting assembly 11 and guide the received light beam to the second cylindrical lens 1312.

The cylindrical lens may be composed of one cylindrical surface and one plane surface, the cylindrical lens having a curvature of the convex lens in an extending direction of a generatrix perpendicular to the cylindrical surface, and having no curvature in an extending direction of a generatrix parallel to the cylindrical surface. The cylindrical lens may be used to change the size of one direction of the light beam passing through the cylindrical lens. In addition, the cylindrical lens can also be used for reducing the divergence degree of the light beam and improving the collimation of the light beam. Since the dimension of the light emitting component 11 in the embodiment of the present application in the row direction f2 of the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112) is larger, the dimension in the arrangement direction f1 of the two rows of laser chips is smaller, so that the dimension of the light spot of the light beam emitted by the light emitting component 11 in one direction is also larger, and the dimension in the other direction is smaller.

For example, please refer to fig. 5 and fig. 6, fig. 5 is a schematic view of a light spot of a light beam emitted from a light combining component provided in an embodiment of the present application, and fig. 6 is a schematic view of a light spot of a light beam emitted from a beam shrinking lens set provided in an embodiment of the present application. The light spots emitted by the plurality of laser chips emitted by the light emitting component 11 may be rectangular, and the aspect ratio of the light spots emitted by the plurality of laser chips may be 7:2, the spot S1 of the light beam emitted from the plurality of laser chips emitted from the light combining module 12 may be rectangular, and the aspect ratio of the spot S1 may be 7:1. the aspect ratio of the projection screen for receiving the light beam emitted from the light source system 10 is far 16:9, so that the first cylindrical lens 1311 and the second cylindrical lens 1312 can compress the dimension of the light spot S1 in the length direction f3, and the dimension of the light spot S1 in the width direction is not changed, so as to obtain the light spot S2 emitted from the plurality of laser chips after the beam shrinking process. So that the shape of the spot S2 emitted by the plurality of laser chips in the light emitting assembly 11 matches the shape of the projection screen.

Alternatively, the first cylindrical lens 1311 may be a plano-convex cylindrical lens, and the second cylindrical lens 1312 may be a plano-concave cylindrical lens or a plano-convex cylindrical lens, with the focal point of the second cylindrical lens 1312 coinciding with the focal point of the first cylindrical lens 1311. A plano-convex cylindrical lens may be used to converge the beam in one direction and a plano-concave cylindrical lens may be used to spread the beam in one direction.

When the first cylindrical lens 1311 is a plano-convex cylindrical lens, the second cylindrical lens 1312 is a plano-concave cylindrical lens, and the focal point of the second cylindrical lens 1312 coincides with the focal point of the first cylindrical lens 1311, the position where the focal point of the second cylindrical lens 1312 coincides with the focal point of the first cylindrical lens 1311 may be located on the side of the second cylindrical lens 1312 away from the first cylindrical lens 1311. In this way, the first cylindrical lens 1311 may converge the received light beam emitted by the light emitting component 11 and transmit the light beam to the second cylindrical lens 1312, the second cylindrical lens 1312 receives the light beam, and the light beam transmitted by the second cylindrical lens 1312 exits in parallel, so that the light beam emitted by the light emitting component 11 is converged while deformation of the light beam is avoided, and the distance between the first cylindrical lens 1311 and the second cylindrical lens 1312 is relatively short, so that the volume of the light source system may be reduced.

When the first cylindrical lens 1311 is a plano-convex cylindrical lens, the second cylindrical lens 1312 is a plano-convex cylindrical lens, and the focal point of the second cylindrical lens 1312 coincides with the focal point of the first cylindrical lens 1311, a position where the focal point of the second cylindrical lens 1312 coincides with the focal point of the first cylindrical lens 1311 may be located between the second cylindrical lens 1312 and the first cylindrical lens 1311. In this way, the first cylindrical lens 1311 can collect the received light beams emitted by the light emitting component 11 and transmit the collected light beams to the second cylindrical lens 1312, the second cylindrical lens 1312 receives the light beams, and the light beams transmitted through the second cylindrical lens 1312 are emitted in parallel, so that the light beams emitted by the light emitting component 11 can be collected while deformation of the light beams is avoided.

Alternatively, as shown in fig. 7, fig. 7 is a schematic structural diagram of a first cylindrical lens provided in the embodiment of the present application, a light spot S1 of a light beam emitted by the light emitting component 11 is a rectangular light spot, and a long side L1 of the rectangular light spot S1 may be perpendicular to a generatrix L2 of a cylindrical surface D1 of the first cylindrical lens 1311.

The first cylindrical lens 1311 may be composed of one cylindrical surface D1 and one plane D2, that is, the first cylindrical lens 1311 has a convex lens curvature in the extending direction f4 of the generatrix L2 perpendicular to the cylindrical surface D1, and has no curvature in the extending direction f4 of the generatrix L2 parallel to the cylindrical surface D1. The first cylindrical lens 1311 may be used to reduce the size of the spot S1 of the light beam emitted by the light emitting assembly 11 in the length direction (the length direction may be the row direction f2 of the two rows of laser chips), and the first cylindrical lens 1311 may reduce the size of the spot S1 in the length direction to one third or one half of the size of the spot S1 before entering the first cylindrical lens 1311, for example.

The long side L1 of the rectangular light spot S1 may be perpendicular to the generatrix L2 of the cylindrical surface D1 of the first cylindrical lens 1311, so that the converging efficiency of the first cylindrical lens 1311 to the light beam emitted by the light emitting component 11 is higher, the light beam transmission efficiency of the light path component 13 can be improved, and the brightness loss caused by the larger divergence degree of the light beam emitted by the light emitting component 11 in the transmission process is avoided.

Alternatively, as shown in fig. 8, fig. 8 is a schematic structural diagram of another light source system provided in the embodiment of the present application, the light path component 13 may further include a first reflecting mirror 132, and a first cylindrical lens 1311, the first reflecting mirror 132, and a second cylindrical lens 1312 are sequentially disposed along the light path direction. The first reflecting mirror 132 may turn the propagation path of the light beam in the light path assembly 13 by 90 degrees, and thus, the size of the illumination system in the arrangement direction parallel to the two rows of light emitting devices may be reduced.

Alternatively, as shown in fig. 1 or 8, the first light combining unit 121 may include a second mirror 1211, the second light combining unit 122 may include a half mirror 1221, the second mirror 1211 is configured to receive the light beam emitted from the first row of laser chips 111 and reflect the light beam emitted from the first row of laser chips 111 toward the half mirror 1221, the half mirror 1221 may be configured to receive and reflect the light beam emitted from the second row of laser chips 112, the half mirror 1221 is further configured to transmit the light beam emitted from the first row of laser chips 111, and the half mirror 1221 is configured to guide the light beam emitted from the second row of laser chips 112 and the light beam emitted from the first row of laser chips 111 toward the optical path assembly.

Since the area of the light beam emitted from the first row laser chip 111 is equal to the area of the light beam emitted from the second row laser chip 112, the area of the second mirror 1211 may be equal to the area of the half mirror 1221, or the area of the half mirror 1221 may be larger than the area of the second mirror 1211, so that the half mirror 1221 can receive the entire light beams emitted from the first row laser chip 111 and the second row laser chip 112.

Optionally, the first light combining unit may include a second reflecting mirror, the second light combining unit may include a half mirror, the second reflecting mirror may be configured to receive the light beam emitted by the first row of laser chips and reflect the light beam emitted by the first row of laser chips toward the half mirror, the half mirror may be configured to receive and transmit the light beam emitted by the second row of laser chips, the half mirror may be further configured to reflect the light beam emitted by the first row of laser chips, and the half mirror may be configured to guide the light beam emitted by the second row of laser chips and the light beam emitted by the first row of laser chips toward the light path assembly. Thus, the light path component can be positioned at one side of the light combining component away from the light emitting component.

Optionally, as shown in fig. 8, the light path assembly may further include a collection optic 133, a light homogenizing component 134, and a speckle dissipating assembly 135. The converging lens group 133 may include at least one lens, which may include a spherical lens, and/or an aspherical lens. The converging lens group may include two convex lenses, which may be spherical lenses or aspherical lenses, and the spherical lenses are easier to form and control precision than the aspherical lenses, so that the manufacturing difficulty and the manufacturing cost of the light source system may be reduced.

The converging lens group 133 may be used to converge the light beam emitted from the second lens 1312 and guide the converged light beam to the light uniformizing part 134. The focal point of the converging lens group 133 may be disposed at the light inlet of the light homogenizing component 134, that is, the focal plane of the converging lens group 133 may be disposed at the light inlet surface of the light homogenizing component 134, so that the light receiving efficiency of the light homogenizing component 134 may be improved.

The light uniformizing member 134 may be a light pipe or a fly eye lens, and may be used to shape and homogenize the laser spot emitted from the light emitting assembly 11. Beam homogenization refers to shaping a beam of unevenly distributed intensity into a beam of evenly distributed cross-section by beam transformation. Laser spots refer to random grainy intensity patterns that result from interference of laser light sources when these beams are used to illuminate, for example, a rough surface of a screen or any other object that is diffusely reflective or diffusely transparent.

The light guide tube is a tubular device formed by splicing four plane reflecting sheets, namely a hollow light guide tube, light rays are reflected in the light guide tube for multiple times to achieve the effect of uniform light, the light guide tube can also adopt a solid light guide tube, the light inlet and the light outlet of the light guide tube are rectangular with identical shape and area, light beams enter from the light inlet of the light guide tube and then exit from the light outlet of the light guide tube, and light beam homogenization and laser spot optimization are completed in the process of passing through the light guide tube. Fly-eye lenses are typically formed by a series of lenslet combinations, with two arrays of fly-eye lenses arranged in parallel to divide the spots of an input laser beam, and the divided spots are accumulated by a subsequent focusing lens to obtain homogenization and spot optimization of the beam.

The speckle removing component 135 can be a diffusion wheel or a vibration diffusion sheet to further improve the uniformity of the laser spot, and can play a role in removing the speckle of the laser beam.

Alternatively, as shown in fig. 8, the light combining component 12 may further include a half-wave plate 123, and the half-wave plate 123 may be used to change the polarization direction of a part of the light beam emitted from the light emitting component 11. The lasers emitted by the multiple laser chips of the light emitting component 11 are linearly polarized light, wherein in the light emitting process of the red laser chip, the blue laser chip and the green laser chip, the polarization direction of the red laser beam is 90 degrees with the polarization directions of the blue laser beam and the green laser beam due to different oscillation directions of the resonant cavities, and the red laser is P polarized light, and the blue laser and the green laser are S polarized light.

In the application of the laser projection device, the laser projection device may be configured with a projection screen, such as an optical screen, having a higher gain and contrast to better restore a projection screen having a high brightness and a high contrast. Illustratively, an ultra-short focal projection screen includes: fresnel optical screen. The Fresnel optical screen can obviously different in transmittance and reflectivity of light beams in different polarization directions, so that unbalance of luminous flux of light beams with different colors, reflected by the screen and entering human eyes, is caused, and the problem of color cast of a local area on a projection picture is caused, so that the phenomenon of uneven chromaticity such as 'color lump' of the projection picture is caused.

In an alternative embodiment, half-wave plate 123 may be located between the light emitting face of the second row of laser chips 112 (which may include at least one green laser chip 11G and at least one blue laser chip 11B) and first mirror 132, and half-wave plate 123 may correspond to a wavelength setting between both blue and green laser beams. In this way, after the blue laser beam and the green laser beam emitted by the second row laser chip 112 pass through the half-wave plate 123, the polarization of the beam changes by 90 degrees, that is, the blue laser beam and the green laser beam incident on the first mirror 132 are P polarized light, so that the blue laser beam and the green laser beam transmitted through the half-mirror 1221 and the red laser beam reflected by the half-mirror 1221 are P polarized light.

The light beams emitted by the at least two red laser chips 11R received by the light combining component 12 are in a first polarization direction, the light beams emitted by the at least one green laser chip 11G and the at least one blue laser chip 11B received by the light combining component 12 are in a second polarization direction, and the first polarization direction is the same as the second polarization direction. That is, the half mirror 1221 can output the laser beams of three colors having the same polarization direction, and the phenomenon of uneven color such as "color spots" or "color patches" in the projection screen can be avoided because the polarization directions of the laser beams of three colors are the same.

At this time, the light uniformizing member 134 may have a rectangular light entrance, and the long side of the light entrance may be parallel to the long side of the spot of the light beam emitted from the light emitting element 11.

In another alternative embodiment, half-wave plate 123 may be located between the light emitting face of first row of laser chips 111 (which may include at least two red laser chips 11R) and first mirror 132, and half-wave plate 123 may be disposed corresponding to the wavelength of the red laser beam. Similarly, half-wave plate 123 may rotate the polarization direction of the red laser beam by 90 degrees, and the red laser beam changes from P-polarized light to S-polarized light.

By arranging the half-wave plate 123 in the output light path of the red laser beam, the red laser beam of the P-polarized light before being irradiated to the half-wave plate 123 is converted into the S-polarized light, so that the polarization directions of the red laser beam and the blue laser beam are consistent with those of the green laser beam, and the phenomenon of uneven color such as 'color spots' or 'color patches' of a projection picture can be avoided.

At this time, the light uniformizing member 134 may have a rectangular light entrance, and the long side of the light entrance may be perpendicular to the long side of the spot of the light beam emitted from the light emitting element 11.

In addition, the light beams emitted by the light combining component 12 have consistent polarization characteristics, so that the light beams can have the same optical transmittance or reflectivity when passing through the same optical components, and the uniformity of the light beams can be improved, which is beneficial to improving the projection display effect.

In summary, the embodiments of the present application provide a light source system, including: the light emitting assembly comprises two rows of laser chips, and the size of the light emitting assembly in the row direction perpendicular to the two rows of laser chips can be made smaller, so that the light emitting assembly can be conveniently installed, and the size of a light source system in the row direction perpendicular to the two rows of laser chips can be reduced; and, the first line of laser chips in two lines of laser chips includes at least two red laser chips, and the second line of laser chips includes at least one green laser chip and at least one blue laser chip, so, the light combination subassembly in this light source system combines the light to two light beams that two lines of laser chips sent to make the light path of light source system comparatively succinct, and then can further make the size of this light source system less. The problems of relatively complex light path and relatively large size of the light source system in the related art can be solved, and the effects of simplifying the light path of the light source system and reducing the size of the light source system are achieved.

As shown in fig. 9, fig. 9 is a schematic structural diagram of a laser projection device according to an embodiment of the present application, where the laser projection device includes: the light source system 10, the optical-mechanical system 20 and the projection lens 30, the light source system 10 is the light source system in any of the above embodiments.

The optical-mechanical system 20 may include an illumination light path formed by a lens group, a light valve and a total reflection prism, where the illumination light path may guide a light beam emitted by the light source system to the light valve, and the light valve modulates the received light beam and then makes the modulated light beam enter the projection lens 30.

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In this application, the terms "first," "second," and "third" 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 (10)

1. A light source system, comprising: the light emitting component, the light combining component and the light path component;

the light emitting assembly comprises two rows of laser chips;

a first one of the two rows of laser chips comprises at least two red laser chips;

the second of the two rows of laser chips comprises at least one green laser chip and at least one blue laser chip;

the light emitting component is used for providing light beams for the light combining component, the light combining component is used for combining the light beams provided by the light emitting component and guiding the combined light beams to the light path component, and the light path component is used for guiding the light beams provided by the light combining component out of the light source system;

the light beams emitted by the at least two red laser chips received by the light combining component are in a first polarization direction, and the light beams emitted by the at least one green laser chip and the at least one blue laser chip received by the light combining component are in a second polarization direction.

2. The light source system of claim 1, wherein the second row of laser chips has at least one of the blue laser chips at an edge in a row direction.

3. The light source system of claim 1, wherein the number of green laser chips in the second row of laser chips is greater than the number of blue laser chips.

4. The light source system according to claim 1, wherein the light combining assembly comprises a first light combining unit and a second light combining unit, the first light combining unit and the second light combining unit are in one-to-one correspondence with the two rows of laser chips, and an arrangement direction of the first light combining unit and the second light combining unit is parallel to an arrangement direction of the two rows of laser chips.

5. The light source system of claim 1, wherein the light path assembly comprises a beam reduction lens set comprising: the first cylindrical lens is used for receiving the light beam provided by the light emitting assembly and guiding the light beam to the second cylindrical lens.

6. The light source system of claim 5, wherein the first cylindrical lens is a plano-convex cylindrical lens, the second cylindrical lens is a plano-concave cylindrical lens or a plano-convex cylindrical lens, and a focal point of the second cylindrical lens coincides with a focal point of the first cylindrical lens.

7. The light source system of claim 6, wherein the light beam emitted by the light emitting assembly has a rectangular light spot with a long side perpendicular to a generatrix of the cylindrical surface of the first cylindrical lens.

8. The light source system of claim 5, wherein the light path assembly further comprises a first mirror, the first cylindrical lens, the first mirror, and the second cylindrical lens being disposed in sequence along a light path direction.

9. The light source system of claim 4, wherein the first light combining unit comprises a second mirror, the second light combining unit comprises a half mirror, the second mirror is configured to receive the light beam emitted by the first row of laser chips and reflect the light beam emitted by the first row of laser chips toward the half mirror, the half mirror is configured to receive and reflect the light beam emitted by the second row of laser chips, and the half mirror is further configured to transmit the light beam emitted by the first row of laser chips.

10. A laser projection device, characterized in that the projection device comprises a light source system, an optical-mechanical system and a projection lens, wherein the light source system is the light source system according to any one of claims 1-9.

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