Light source systems and laser projection equipment

Abstract

The present application discloses a light source system and laser projection equipment, belonging to the field of projection technology. The light source system includes: a light-emitting component, a polarization conversion component, and a light-combining component, wherein the light-emitting component includes two rows of laser chips, a first polarization angle conversion unit in the polarization conversion component is located between some of the laser chips in the first row of laser chips and the light-combining component, and a second polarization angle conversion unit is located between the first laser chip group and the light-combining component. In this way, the light beams emitted by some of the laser chips in the light-emitting component can pass through the polarization conversion component and be emitted to the light-combining component, so that among the three colors of laser beams emitted by the two rows of laser chips, at least two colors of laser beams each have two polarization directions, which can make the coherence of laser beams of the same color low, thereby achieving the effect of improving the speckle phenomenon of the laser beams emitted by the light source system.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to an illumination system and a laser projection device. Background Art

[0002] Laser light sources are currently the most ideal light source due to their excellent monochromaticity, high brightness, and long lifespan. Laser projection display technology is a new type of projection display technology currently on the market. Compared to light-emitting diode (LED) projection products, laser light sources have the advantages of low etendue and high brightness. Laser projection display technology also features clear imaging, vivid colors, and higher brightness. These significant features have gradually made laser projection display technology a mainstream development direction in the market.

[0003] A light source system for laser projection equipment provides the required illumination beam for the laser projection equipment. The light source system includes: 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 also includes a first light combining mirror, a second light combining mirror, and a third light combining mirror, respectively, corresponding to the three color laser chip assemblies, for combining the light beams emitted by the three color laser chip assemblies and outputting them out of the light source system. The laser beam emitted by the light source system is modulated and projected onto a projection screen, thereby realizing the projection display of the laser projection equipment.

[0004] However, the laser beam emitted by the above light source system has strong coherence, which results in a serious speckle phenomenon in the beam emitted by the light source system. Summary of the Invention

[0005] The present invention provides a light source system and a laser projection device. The technical solution is as follows:

[0006] According to one aspect of the present application, a light source system is provided, comprising: a light emitting component, a polarization conversion component, and a light combining component;

[0007] The light emitting assembly includes two rows of laser chips;

[0008] The first row of laser chips in the two rows of laser chips includes at least two red laser chips;

[0009] The second row of laser chips in the two rows of laser chips includes at least two first-color laser chips and at least one second-color laser chip, the second row of laser chips includes a first laser chip group and a second laser chip group, the first laser chip group includes at least one first-color laser chip, and the second laser chip group includes at least one first-color laser chip and at least one second-color laser chip;

[0010] The polarization conversion component includes: a first polarization angle conversion unit and a second polarization angle conversion unit, the first polarization angle conversion unit is located between some laser chips in the first row of laser chips and the light combining component, and the second polarization angle conversion unit is located between the first laser chip group and the light combining component.

[0011] Optionally, the number of the second-color laser chips is at least two, and the first laser chip group further includes at least one second-color laser chip.

[0012] Optionally, the polarization direction of the light beam emitted by the red laser chip is a first polarization direction, the polarization direction of the light beam emitted by the first color laser chip and the second color laser chip is a second polarization direction, the first polarization angle conversion unit is used to convert the light beam with the first polarization direction into a light beam with the second polarization direction, and the second polarization angle conversion unit is used to convert the light beam with the second polarization direction into a light beam with the first polarization direction.

[0013] Optionally, the first row of laser chips includes a first red laser chip group and a second red laser chip group, and the first red laser chip group and the second red laser chip group each include at least one red laser chip;

[0014] The second polarization angle conversion unit is located in the light emitting direction of the first laser chipset, and the first polarization angle conversion unit is located in the light emitting direction of the second red laser chipset. The first red laser chipset and the first laser chipset are arranged in one row in the light emitting component, and the second red laser chipset and the second laser chipset are arranged in another row in the light emitting component.

[0015] Optionally, the light combining assembly includes a first light combining unit and a second light combining unit, the first light combining unit being used to receive the light beam emitted by the first laser chipset and passing through the first polarization angle conversion unit, and being used to receive the light beam provided by the first red laser chipset, and the second light combining unit being used to receive the light beam emitted by the second red laser chipset and passing through the second polarization angle conversion unit, and being used to receive the light beam provided by the second laser chipset.

[0016] Optionally, the first light combining unit and the second light combining unit are arranged along a row direction perpendicular to the two rows of laser chips.

[0017] Optionally, the first light combining unit includes a reflector, and the second light combining unit includes a polarization beam splitter;

[0018] The reflector is used to reflect the received light beam toward the polarization beam splitter;

[0019] The polarization beam splitter is used to transmit the light beam reflected by the reflector;

[0020] The polarization beam splitter is further used to reflect the light beam passing through the second polarization angle conversion unit and reflect the light beam emitted by the second laser chip group.

[0021] Optionally, the second polarization angle conversion unit includes a first wave plate, and the first wave plate is used to receive the light beam emitted by the first color laser chip and to receive the light beam emitted by the second color laser chip.

[0022] Optionally, the second polarization angle conversion unit includes a second wave plate and a third wave plate, the second wave plate is used to receive the light beam emitted by the first color laser chip, and the third wave plate is used to receive the light beam emitted by the second color laser chip.

[0023] Optionally, one of the first-color laser chip and the second-color laser chip is configured to emit green light, and the other laser chip is configured to emit blue light.

[0024] According to another aspect of the present application, a laser projection device is provided, which includes: the above-mentioned light source system, an optical-mechanical system and a projection lens.

[0025] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0026] A light source system is provided, comprising: a light-emitting component, a polarization conversion component, and a light-combining component, wherein the light-emitting component includes two rows of laser chips, a first polarization angle conversion unit in the polarization conversion component is located between some of the laser chips in the first row of laser chips and the light-combining component, and a second polarization angle conversion unit is located between the first laser chip group and the light-combining component. In this way, the light beams emitted by some of the laser chips in the light-emitting component can pass through the polarization conversion component and be emitted to the light-combining component. This can ensure that among the three colors of laser beams emitted by the two rows of laser chips, at least two colors of laser beams each have two polarization directions, which can make the coherence of laser beams of the same color low, thereby achieving the effect of improving the speckle phenomenon of the laser beams emitted by the light source system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 is a structural diagram of a light source system shown in an embodiment of the present application;

[0029] Figure 2 yes Figure 1 A schematic diagram of a local structure of the light source system shown in the figure, looking at the light source system perpendicular to the light emitting surface of the light emitting component;

[0030] Figure 3 This is a structural diagram of a transmission component provided in an embodiment of the present application;

[0031] Figure 4 yes Figure 2 Another schematic diagram of area division of the local structure of the light emitting component shown;

[0032] Figure 5 Schematic diagram of a spot of a laser beam emitted by a light combining component provided in an embodiment of the present application;

[0033] Figure 6 is a structural diagram of another light source system provided in an embodiment of the present application;

[0034] Figure 7 yes Figure 6 A schematic structural diagram of the diffuser assembly shown;

[0035] Figure 8 It is a structural schematic diagram of a laser projection device provided in an embodiment of the present application.

[0036] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0038] With the development of laser light sources, the demand for high-quality projection images in projection equipment is becoming increasingly stringent. The multiple laser chips in a projection device's light-emitting assembly can be categorized by emission color: red, blue, and green laser chips, emitting red, blue, and green laser beams, respectively. Since the blue and green laser chips utilize gallium arsenide (GaAs) as a luminescent material to generate blue and green laser beams, and the red laser chip utilizes gallium nitride (GaN) as a luminescent material to generate red laser beams, the resonant cavity oscillation direction of the red, blue, and green laser chips differs during the emission process due to the different luminescence mechanisms of the luminescent materials. This results in a different polarization direction for the red laser beam than for the blue and green laser beams, and a different polarization direction for the red laser beam than for the blue and green laser beams. The red laser beam is p-polarized, while the blue and green laser beams are both s-polarized, with the P and S polarization directions perpendicular.

[0039] The light emitted by current projection devices has a high degree of coherence, resulting in a severe speckle effect in the projected image, resulting in poor display quality. The speckle effect refers to the spatial interference of two laser beams emitted by a coherent light source when they are irradiated onto an optically rough surface (i.e., a surface with an average undulation greater than the wavelength, such as a projection screen). Due to the coherent superposition of wavelets scattered by a large number of irregularly distributed surfaces on the surface, the two laser beams interfere with each other, resulting in a reflected light field with a random spatial intensity distribution and a granular structure. This ultimately creates an effect of granular, alternating light and dark spots on the screen, which are referred to as laser speckle. The speckle effect results in poor display quality for the projected image, and these unfocused, alternating light and dark spots appear to flicker to the human eye. Prolonged viewing can easily cause dizziness in viewers, resulting in a poor viewing experience.

[0040] The embodiments of the present application provide a light source system that can solve the problems in the above-mentioned related technologies.

[0041] Figure 1 is a structural diagram of a light source system shown in an embodiment of the present application. Figure 2 yes Figure 1 The light source system shown is a partial structural diagram 10A of the light source system viewed along a light emitting surface P1 perpendicular to the light emitting component. The light source system 10 may include: a light emitting component 11 , a polarization conversion component 12 and a light combining component 13 .

[0042] 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). 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 111R ( Figure 2 The light spot emitted by the red laser chip 111R is used to identify the position of the red laser chip 111R).

[0043] Two rows of laser chips (a first row of laser chips 111 and a second row of laser chips 112, Figure 2 The positions of the first row of laser chips 111 and the second row of laser chips 112 are marked by the light spots emitted by the first row of laser chips 111 and the second row of laser chips 112). The second row of laser chips 112 includes at least two first color laser chips 1121 ( Figure 2 The light spot emitted by the first color laser chip 1121 is used to mark the position of the first color laser chip 1121) and at least one second color laser chip 1122 ( Figure 2 The light spot emitted by the second color laser chip 1122 is used to identify the location of the second color laser chip 1122).

[0044] The red laser chip 111R can be used to emit a red laser beam, the first-color laser chip 1121 can be used to emit a first-color laser beam, and the second-color laser chip 1122 can be used to emit a second-color laser beam. In the embodiment of the present application, because the projection device requires a larger component of the red laser beam when projecting an image, the number of red laser chips 111R in the light-emitting assembly 11 can be greater than the number of first-color laser chips 1121. The number of red laser chips 111R can also be greater than the number of second-color laser chips 1122, so that the light-emitting assembly 11 can emit more red laser beams. Therefore, the first row of laser chips 111 can include only red laser chips, and the second row of laser chips 112 can include only first-color laser chips 1121 and second-color laser chips 1122. The number of laser chips in the first row of laser chips 111 is the same as the number of laser chips in the second row of laser chips 112. That is, the number of red laser chips 111R can be the sum of the number of first-color laser chips 1121 and the number of second-color laser chips 1122. Exemplarily, the number of the red laser chips 111R in the first row of laser chips 111 in the light emitting assembly 11 may be seven.

[0045] The second row of laser chips 112 may include a first laser chip group 112a and a second laser chip group 112b. The first laser chip group 112a may include at least one first-color laser chip 1121, and the second laser chip group 112b may include at least one first-color laser chip 1121 and at least one second-color laser chip 1122. That is, the first laser chip group 112a may include either monochromatic or multi-color laser chips. The first-color laser chip 1121 may be a blue laser chip or a green laser chip, and the second-color laser chip 1122 may be a blue laser chip or a blue-green laser chip. The first-color laser chip 1121 and the second-color laser chip 1122 may have different colors.

[0046] The polarization conversion component 12 may include: a first polarization angle conversion unit 121 and a second polarization angle conversion unit 122. The first polarization angle conversion unit 121 can be located between some laser chips in the first row of laser chips 111 and the light combining component 13, and the second polarization angle conversion unit 122 can be located between the first laser chip group 112a and the light combining component 13, that is, the polarization conversion component 12 can be set in the transmission path of the light beam emitted by the light-emitting component 11 to the light combining component 13. Since the laser beam of each color emitted by the laser chip is linearly polarized light, illustratively, it can be P-polarized light or S-polarized light, the polarization conversion component 12 can change the polarization direction of the laser beam incident on the polarization conversion component 12. In the embodiment of the present application, the polarization conversion component 12 can be used to change the polarization direction of the laser beam incident on the polarization conversion component 12. illustratively, the polarization conversion component 12 can rotate the polarization direction of the laser beam incident on the polarization conversion component 12 by 90 degrees. Therefore, when the first red laser beam emitted by some of the red laser chips 111R in the first row of laser chips 111 passes through the first polarization angle conversion unit 121 and enters the light combining component 13, the polarization direction of the first red laser beam is deflected by 90 degrees relative to the second red laser beam emitted by another part of the red laser chips 111R in the first row of laser chips 111 that directly enters the light combining component 13. Similarly, when the first color laser beam emitted by at least one first color laser chip 1121 in the first laser chip group 112a passes through the second polarization angle conversion unit 122 and is incident on the light combining component 13, the polarization direction of the first color laser beam emitted by at least one first color laser chip 1121 in the second laser chip group 112b and is incident on the light combining component 13 after passing through the second polarization angle conversion unit 122 is deflected by 90 degrees.

[0047] Exemplarily, the light emitting direction of the light emitting component 11 is the first direction f1. On a plane perpendicular to the first direction f1, the orthographic projection of the first polarization angle conversion unit 121 covers the orthographic projection of some of the laser chips in the first row of laser chips 111. Some of the laser chips in the first row of laser chips 111 can refer to one laser chip, two laser chips, or more laser chips in the first row of laser chips 111. In the embodiment of the present application, the number of laser chips 111 in the first row can be 7. The first polarization angle conversion unit 121 can be located between three laser chips in the first row of laser chips 111 and the light combining component 13, or the first polarization angle conversion unit 121 can be located between four laser chips in the first row of laser chips 111 and the light combining component 13.

[0048] In this way, the first polarization angle conversion unit 121 and the second polarization angle conversion unit 122 of the polarization conversion assembly 12 can adjust the polarization directions of the partial laser beams incident on the first polarization angle conversion unit 121 and the second polarization angle conversion unit 122 respectively.

[0049] In summary, an embodiment of the present application provides a light source system, comprising: a light-emitting component, a polarization conversion component, and a light-combining component, wherein the light-emitting component comprises two rows of laser chips, the first polarization angle conversion unit in the polarization conversion component is located between some of the laser chips in the first row of laser chips and the light-combining component, and the second polarization angle conversion unit is located between the first laser chip group and the light-combining component. In this way, the light beams emitted by some of the laser chips in the light-emitting component can pass through the polarization conversion component and be emitted toward the light-combining component, so that among the three colors of laser beams emitted by the two rows of laser chips, at least two colors of laser beams each have two polarization directions, which can make the coherence of laser beams of the same color lower, thereby achieving the effect of improving the speckle phenomenon of the laser beams emitted by the light source system.

[0050] Alternatively, as Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of a light emitting component provided by an embodiment of the present application. The light emitting component 11 can be a multi-chip package type (English: multi chip LD; abbreviated: MCL) laser component, that is, multiple laser chips are packaged on a substrate to form a surface light source output. Figure 2As shown, the light emitting component 11 may further include a substrate 113, on which two rows of laser chips (a first row of laser chips 111 and a second row of laser chips 112) are packaged. 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, or may be driven in parallel in rows or columns, or may be driven in parallel in accordance with different colors. The plurality of laser chips may all be rectangular, or the plurality of laser chips may also be in other shapes such as ellipses. This embodiment of the present application does not impose any restrictions on this. The plurality of laser chips may be arranged in a row along the slow axis direction of the laser chip and in two rows along the fast axis direction of the laser chip, as shown in FIG. Figure 2 As shown, the shape of the light spot emitted by multiple laser chips can be an ellipse, the fast axis direction of the laser chip can be parallel to the extension direction of the long axis of the ellipse, and the slow axis direction of the laser chip can be parallel to the extension direction of the short axis of the ellipse.

[0051] The substrate 113 may have multiple pins on both sides of the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112) in the row direction f2. The multiple pins may be electrically connected to the circuit board in the light source system to transmit electrical signals to the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112), thereby driving the two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112) to emit light. The multiple pins may include a positive pin 1131 and three negative pins (a first negative pin 1132, a second negative pin 1133, and a third negative pin 1134). The three colors of lasers in the two rows of lasers may share a single positive pin 1131. In this way, compared to providing a positive pin and a negative pin for each color of laser, the number of pins in the light-emitting component 11 of the present application can be reduced, which can simplify the manufacturing process of the light-emitting component 11 and reduce the manufacturing cost of the light-emitting component.

[0052] Alternatively, as Figure 2 and Figure 3As shown, the number of second-color laser chips 1122 can be at least two, and the first laser chip group 112a can further include at least one second-color laser chip 1122. That is, the first laser chip group 112a can include laser chips of two colors, and the number of second-color laser chips 1122 can be greater than the number of first-color laser chips 1121. In this way, when the first color laser beam emitted by at least one first color laser chip 1121 in the first laser chip group 112a passes through the second polarization angle conversion unit 122 and then enters the light combining component 13, the polarization direction of the first color laser beam is deflected by 90 degrees relative to the first color laser beam emitted by at least one first color laser chip 1121 in the second laser chip group 112b and then enters the light combining component 13 after passing through the second polarization angle conversion unit 122. Moreover, when the second color laser beam emitted by at least one second color laser chip 1122 in the first laser chip group 112a passes through the second polarization angle conversion unit 122 and then enters the light combining component 13, the polarization direction of the second color laser beam is deflected by 90 degrees relative to the second color laser beam emitted by at least one second color laser chip 1122 in the second laser chip group 112b and then enters the light combining component 13 after passing through the second polarization angle conversion unit 122. That is, the first-color laser beam emitted by the first-color laser chip 1121 in the second row of laser chips 112 received by the light-combining assembly 13 has two different polarization directions. At the same time, the second-color laser beam emitted by the second-color laser chip 1122 in the second row of laser chips 112 received by the light-combining assembly 13 has two different polarization directions. This ensures that the red laser beam emitted by the red laser chip 111R, the first-color laser beam emitted by the first-color laser chip 1121, and the second-color laser beam emitted by the second-color laser chip 1122 all have two polarization directions, reducing the coherence of laser beams of the same color.

[0053] Optionally, the polarization direction of the light beam emitted by the red laser chip 111R can be a first polarization direction, the polarization direction of the light beam emitted by the first color laser chip 1121 and the second color laser chip 1122 can be a second polarization direction, the first polarization angle conversion unit 121 can be used to convert the light beam with the first polarization direction into a light beam with the second polarization direction, and the second polarization angle conversion unit 122 can be used to convert the light beam with the same transmission direction and the second polarization direction into a light beam with the first polarization direction.

[0054] The first polarization angle conversion unit 121 and the second polarization angle conversion unit 122 can both be half-wave plates. The half-wave plate can rotate the polarization direction of the laser beam incident on the half-wave plate by 90 degrees. In this way, a portion of the red laser beam emitted by the red laser chip 111R received by the light combining component 13 can have a first polarization direction, and another portion of the red laser beam can have a second polarization direction. In this way, the coherence of the red laser beam in the light source system 10 can be reduced, thereby avoiding the speckle effect when projection imaging is applied. In the first-color laser beam and the second-color laser beam emitted by the first-color laser chip 1121 and the second-color laser chip 1122 received by the light combining component 13, a portion of the laser beam can have a first polarization direction, and another portion of the laser beam can have a second polarization direction. In this way, the coherence of the first-color laser beam and the second-color laser beam in the light source system 10 can be reduced, thereby avoiding the speckle effect when projection imaging is applied.

[0055] Moreover, each of the three colors of laser light sources received by the light-combining component 13 has two different polarization directions, which can be a first polarization direction and a second polarization direction. In this way, the light-combining component 13 can combine two light beams with different polarization directions, which can make the light-combining optical path of the light-combining component 13 simpler, and thus the light source system 10 can have fewer components and a smaller size.

[0056] Optionally, Figure 4 yes Figure 2 Another regional division diagram of the local structure of the light emitting component shown is shown in FIG. Figure 2 and Figure 3 The first row of laser chips 111 may include a first red laser chip group 111a and a second red laser chip group 111b. The first red laser chip group 111a and the second red laser chip group 111b each include at least one red laser chip 111R. Further, the first red laser chip group 111a and the second red laser chip group 111b each include a plurality of red laser chips 111R arranged in series.

[0057] The second polarization angle conversion unit 122 can be located in the light emitting direction of the first laser chipset 112a, and the first polarization angle conversion unit 121 can be located in the light emitting direction of the second red laser chipset 111b. The first red laser chipset 111a and the first laser chipset 112a are arranged in a row in the light emitting component 11, and the second red laser chipset 111b and the second laser chipset 112b are arranged in another row in the light emitting component 11. The light-emitting component 11 may include two areas (a first area 11A and a second area 11B), wherein the first red laser chip group 111a and the first laser chip group 112a arranged in a row may be located in the first area 11A. Since the red laser beam emitted by the first red laser chip group 111a has a first polarization direction, and the laser beam emitted by the first laser chip group 112a has a second polarization direction, the second polarization angle conversion unit 122 may convert the beam with the second polarization direction into a beam with the first polarization direction, so that the laser beams emitted by the multiple light-emitting devices in the first area 11A may all have the first polarization direction when irradiated to the light-combining component 13.

[0058] The second red laser chipset 111b and the second laser chipset 112b arranged in a row can be located in the second area 11B. Since the red laser beam emitted by the first red laser chipset 111a has a first polarization direction, the first polarization angle conversion unit 121 can convert the beam with the first polarization direction into a beam with a second polarization direction, and the laser beam emitted by the second laser chipset 112b has the second polarization direction, so that the laser beams emitted by the multiple light-emitting devices in the second area 11B can all have the second polarization direction when irradiated to the light combining component 13.

[0059] In this way, the light combining component 13 can combine two three-color laser beams with different polarization directions emitted by multiple laser chips in two areas (the first area 11A and the second area 11B), thereby making the optical path of the light source system simpler and further reducing the size of the light source system.

[0060] Optionally, the light combining component 13 includes a first light combining unit 131 and a second light combining unit 132. The first light combining unit 131 is used to receive the light beam emitted by the first laser chip group 112a and passed through the second polarization angle conversion unit 122, and is used to receive the light beam provided by the first red laser chip group 111a, that is, the first light combining unit 131 can be used to receive three colors of laser light beams in the first polarization direction.

[0061] The second light combining unit 132 is used to receive the light beam emitted by the first red laser chipset 111b and transmitted through the first polarization angle conversion unit 121, and is also used to receive the light beam provided by the second laser chipset 112b. That is, the second light combining unit 132 can be used to receive three-color laser beams in the second polarization direction. The light combining assembly 13 can combine the three-color laser beams in the first polarization direction with the three-color laser beams in the second polarization direction, so that each of the three-color laser beams has two polarization directions. This can reduce the coherence of the combined three-color laser beams, thereby avoiding the speckle effect of the laser beams emitted by the light source system and improving the projection effect of the laser projection device.

[0062] Optionally, the first light combining unit 131 and the second light combining unit 132 are arranged along a row direction f2 parallel to two rows of laser chips (the first row of laser chips 111 and the second row of laser chips 112 ).

[0063] The first light-combining unit 121 and the second light-combining unit 122 can correspond one-to-one to the two regions (the first region 11A and the second region 11B) of the light-emitting assembly 11. That is, the first light-combining unit 121 can receive the three-color laser beams emitted by the three-color laser chips in the first region 11A, and the second light-combining unit 122 can receive the three-color laser beams emitted by the three-color laser chips in the second region 11B.

[0064] The light-emitting surface of the first light-combining unit 131 and the light-emitting surface of the second light-combining unit 132 can both form a 45-degree angle with the plane of the light-emitting surface of the light-emitting component 11. In this way, the light-combining component 12 can combine the three colors of laser light beams into a mixed light beam through the first light-combining unit 121 and the second light-combining unit 122, and guide the mixed light beam to the subsequent optical elements. Compared with the related art, the light-combining component includes three or even more light-combining units. The light path of the light-combining component 12 in the embodiment of the present application is simpler and the optical structure is also simpler, thereby making the light path of the light source system 10 simpler, and further reducing the size of the light source system 10.

[0065] Optionally, the first light combining unit 131 may include a reflector 1311, and the second light combining unit 132 may include a polarization beam splitter 1312, the reflector 1311 is used to reflect the received light beam toward the polarization beam splitter 1312; the polarization beam splitter 1312 is used to transmit the light beam reflected by the reflector 1311, and the polarization beam splitter 1312 is also used to reflect the light beam passing through the second polarization angle conversion unit 122, and reflect the light beam emitted by the second laser chip group 112b.

[0066] Polarization beam splitter 1312 allows incident polarized light of a first polarization direction to pass completely through, while reflecting incident polarized light of a second polarization direction at an exit angle of 45 degrees. In this way, polarization beam splitter 1312 can direct the received laser beam of the first polarization state and the received laser beam of the second polarization state to subsequent optical elements, thereby allowing the laser beam of the first polarization state and the laser beam of the second polarization state to be more uniformly combined into a mixed beam, thereby reducing the coherence of the mixed beam.

[0067] Optionally, the second polarization angle conversion unit 122 may include a first wave plate 1221, which is used to receive the light beam emitted by the first-color laser chip 1121 and the light beam emitted by the second-color laser chip 1122. For the combined optical path of multi-color laser beams, the first wave plate 1221 can be set to the wavelength of one of the laser beam colors, or the first wave plate 1221 can be set to an intermediate value between the wavelengths of the two laser beam colors. In this way, the first laser chip group 112a, which includes the first-color laser chip 1121 and the second-color laser chip 1122, can correspond to a first wave plate, which can simplify the structure of the second polarization angle conversion unit 122.

[0068] Optionally, the second polarization angle conversion unit 122 includes a second wave plate 1222 and a third wave plate 1223 . The second wave plate 1222 is used to receive the light beam emitted by the first color laser chip 1121 , and the third wave plate 1223 is used to receive the light beam emitted by the second color laser chip 1122 .

[0069] The second wave plate 1222 can be set to correspond to the wavelength of the first color laser beam, and the third wave plate 1223 can be set to correspond to the wavelength of the second color laser beam. In this way, the polarization polarity of the first color laser beam emitted by the first color laser chip 1121 and the second color laser beam emitted by the second color laser chip 1122 can be changed by 90 degrees after passing through the second wave plate 1222 and the third wave plate 1223 respectively.

[0070] Optionally, one of the first color laser chip 1121 and the second color laser chip 1122 is used to emit green light, and the other laser chip is used to emit blue light. In this way, the mixed light beam emitted by the light-combining component 13 can be white light. Exemplarily, the arrangement of the multiple laser chips in the light-emitting component 11 can be: 7 red laser chips 111R are arranged in a row, 3 blue laser chips and 4 green laser chips are arranged in a row, and two green laser chips are arranged between two adjacent blue laser chips. The first polarization angle conversion unit 121 can be located between the 4 red laser chips 111R in the first row of laser chips 111 and the light-combining component 13, and the second polarization angle conversion unit 122 can be located between the 1 blue laser chip and the 2 green laser chips in the second row of laser chips 112 and the light-combining component 13.

[0071] like Figure 5 As shown, Figure 5 Schematic diagram of the light spot of a laser beam emitted by a light combining component provided in an embodiment of the present application. The light spot S1 of multiple laser chips can be a rectangular light spot, and the light spots of multiple laser chips can be aligned and arranged in two rows to match the shape of subsequent optical elements. The mixed light beam emitted by the light combining component 13 can be white light. The laser beam of the first polarization state and the laser beam of the second polarization state can be more evenly synthesized into a mixed light beam, and each color of the laser beam in the mixed light beam has a mutually orthogonal polarization direction, so that the coherence of the mixed light beam is low, thereby achieving the effect of improving the speckle phenomenon of the laser beam emitted by the light source system. Moreover, the spot of the blue laser beam can be located on both sides of the spot of the green laser beam. Since the luminous efficiency of the blue laser chip 11B is higher than that of the green laser chip 11G, and since the light beam emitted by 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 light beam emitted by the laser chip at the edge of the second row of laser chips 112 suffer greater loss. Therefore, the blue laser chip 11B can be set at the edge of the second row of laser chips 112, and the spot of the blue laser beam can be located on both sides of the spot of the green laser beam to improve the overall luminous efficiency of the light-emitting component.

[0072] Alternatively, as Figure 6 As shown, Figure 6 It is a structural schematic diagram of another light source system provided in an embodiment of the present application. The light source system 10 may further include an optical path component 14. The optical path component 14 may include a diffuser component 141, a converging lens group 142, a diffuser wheel 143 and a light uniforming component 144 arranged in sequence along the light beam propagation path.

[0073] The diffuser assembly 141 can receive the mixed laser beam emitted by the light combining assembly 13, and diffuse the received mixed laser beam and then emit it to the converging lens group 142. The converging lens group 142 can converge the incident laser to the diffuser wheel 143. The diffuser wheel 143 can further improve the uniformity of the laser spot. After the diffuser wheel 143 despots the received light beam, it guides the light beam to the light homogenizing component 144. The light homogenizing component 144 can homogenize the received laser and then emit it.

[0074] Among them, Figure 7 As shown, Figure 7 yes Figure 6 The diffuser assembly 141 is a schematic structural diagram. The diffuser assembly 141 may be a vibrating diffuser assembly. The diffuser 141 may include a bracket 1411, multiple vibration-conducting structures 1412, a first electrode 1413, a second electrode 1414, and a diffuser 1415. The bracket 1411 is fixedly connected to one side of the multiple vibration-conducting structures 1412, and the other side of the multiple vibration-conducting structures 1412 may be fixedly connected to the diffuser 141. The first electrode 1413, the second electrode 1414, and two of the multiple vibration-conducting structures 1412 may be electrically connected. The vibration-conducting structures 1412, driven by electricity, can transmit vibrations to the diffuser, causing the diffuser to vibrate, thereby improving the despeckle effect of the optical path assembly 14.

[0075] In summary, an embodiment of the present application provides a light source system, comprising: a light-emitting component, a polarization conversion component, and a light-combining component, wherein the light-emitting component comprises two rows of laser chips, the first polarization angle conversion unit in the polarization conversion component is located between some of the laser chips in the first row of laser chips and the light-combining component, and the second polarization angle conversion unit is located between the first laser chip group and the light-combining component. In this way, the light beams emitted by some of the laser chips in the light-emitting component can pass through the polarization conversion component and be emitted toward the light-combining component, so that among the three colors of laser beams emitted by the two rows of laser chips, at least two colors of laser beams each have two polarization directions, which can make the coherence of laser beams of the same color lower, thereby achieving the effect of improving the speckle phenomenon of the laser beams emitted by the light source system.

[0076] like Figure 8 As shown, Figure 8 It is a structural schematic diagram of a laser projection device provided in an embodiment of the present application. The laser projection device includes: a light source system 10, an optical machine system 20 and a projection lens 30. The light source system 10 is the light source system in any of the above embodiments.

[0077] The optical system 20 may include an illumination light path formed by a lens group, a light valve and a total reflection prism. The illumination light path may guide the light beam emitted by the light source system to the light valve, and the light valve modulates the received light beam and then injects it into the projection lens 30.

[0078] In this application, the term "and / or" simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0079] In this application, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless expressly limited otherwise.

[0080] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A light source system, characterized in that: include: Light-emitting components, polarization conversion components, and light-combining components; The light emitting assembly includes two rows of laser chips; The first row of laser chips in the two rows of laser chips includes at least two red laser chips; the first row of laser chips includes a first red laser chip group and a second red laser chip group, and the first red laser chip group and the second red laser chip group each include at least one red laser chip; The second row of laser chips in the two rows of laser chips includes at least two first-color laser chips and at least one second-color laser chip, the second row of laser chips includes a first laser chip group and a second laser chip group, the first laser chip group includes at least one first-color laser chip, and the second laser chip group includes at least one first-color laser chip and at least one second-color laser chip; The polarization conversion assembly includes: a first polarization angle conversion unit and a second polarization angle conversion unit, the first polarization angle conversion unit is located between some laser chips in the first row of laser chips and the light combining assembly, and the second polarization angle conversion unit is located between the first laser chip group and the light combining assembly; The polarization direction of the light beam emitted by the red laser chip is a first polarization direction, and the polarization directions of the light beams emitted by the first color laser chip and the second color laser chip are second polarization directions; The first polarization angle conversion unit is used to convert the light beam having the first polarization direction into a light beam having the second polarization direction, and the second polarization angle conversion unit is used to convert the light beam having the second polarization direction into a light beam having the first polarization direction; The second polarization angle conversion unit is located in the light emitting direction of the first laser chipset, the first polarization angle conversion unit is located in the light emitting direction of the second red laser chipset, the first red laser chipset and the first laser chipset are arranged in one row in the light emitting assembly, and the second red laser chipset and the second laser chipset are arranged in another row in the light emitting assembly; The light combining assembly includes a first light combining unit and a second light combining unit. The first light combining unit is used to receive the light beam emitted by the first laser chipset and passed through the first polarization angle conversion unit, and is used to receive the light beam provided by the first red laser chipset. The second light combining unit is used to receive the light beam emitted by the second red laser chipset and passed through the second polarization angle conversion unit, and is used to receive the light beam provided by the second laser chipset.

2. The light source system according to claim 1, wherein: The number of the second-color laser chips is at least two, and the first laser chip group further includes at least one second-color laser chip.

3. The light source system according to claim 1, wherein: The first light combining unit and the second light combining unit are arranged along a row direction perpendicular to the two rows of laser chips.

4. The light source system according to claim 1, wherein: The first light combining unit includes a reflector, and the second light combining unit includes a polarization beam splitter; The reflector is used to reflect the received light beam toward the polarization beam splitter; The polarization beam splitter is used to transmit the light beam reflected by the reflector; The polarization beam splitter is further used to reflect the light beam passing through the second polarization angle conversion unit and reflect the light beam emitted by the second laser chip group.

5. The light source system according to claim 2, wherein: The second polarization angle conversion unit includes a first wave plate, and the first wave plate is used to receive the light beam emitted by the first color laser chip and to receive the light beam emitted by the second color laser chip.

6. The light source system according to claim 2, wherein: The second polarization angle conversion unit includes a second wave plate and a third wave plate. The second wave plate is used to receive the light beam emitted by the first color laser chip, and the third wave plate is used to receive the light beam emitted by the second color laser chip.

7. The light source system according to any one of claims 1 to 6, characterized in that: One of the first-color laser chip and the second-color laser chip is configured to emit green light, and the other laser chip is configured to emit blue light.

8. A laser projection device, characterized in that: The projection device comprises: the light source system according to any one of claims 1 to 7, an optical-mechanical system and a projection lens.

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