Light source system and laser projection device

Abstract

The application provides a light source system and a laser projection device, the light source system comprising a first laser and a second laser, the first laser being used for emitting at least two laser beams with different wavelengths, and the different laser beams emitted by the first laser having different polarization directions, the laser beams emitted by the first laser comprising a first laser beam with a first wavelength; the second laser being used for emitting a second laser beam with the first wavelength, the polarization direction of the second laser beam being the same as that of the first laser beam. The application can increase the color matching of the light source system, thereby increasing the brightness of the light source system, the light spot uniformity being high, and the volume of the light source system being reduced.

Description

Technical Field

[0001] This invention relates to the field of laser projection technology, and more particularly to a light source system and a laser projection device. Background Technology

[0002] With the continuous development of science and technology, the requirements for the projected images of laser projection equipment are becoming increasingly stringent. Lasers are typically used to provide illumination for laser projection equipment. The laser beam emitted by a laser has the advantages of good monochromaticity and high brightness, making it a relatively ideal light source. Among these, laser projection has gradually gained market share due to its wide color gamut, high brightness, and long lifespan, and laser projection equipment is increasingly being used in people's work and daily lives.

[0003] Currently, to ensure the display brightness of the projected image in the light source system, due to laser design limitations, the current RGB ratio mainly relies on the laser chip. Therefore, it is necessary to add a laser with a certain color scheme, i.e., a monochromatic laser. The light source system typically includes: a tri-color laser, a monochromatic laser, a beam combiner, and a beam homogenizer. To ensure the uniform distribution of the light spots from the tri-color and monochromatic lasers, prisms are used, and the light is combined through a reflector. To ensure the required beam homogenization, a set of mirrors is added after the diffuser. This set of mirrors achieves a uniform distribution of the incident light spot. The beam homogenizer homogenizes the laser from the beam combiner and guides it to the optomechanical system.

[0004] However, existing light source systems use reflectors to combine light and add lenses to ensure the uniformity of the light spot, which greatly increases the size of the light source system and the number of lenses, resulting in a poor user experience. Summary of the Invention

[0005] The main objective of this invention is to provide a light source system and a laser projection device that reduces laser speckle, can increase a certain color scheme in the entire light source system, thereby increasing the brightness of the light source system, has high light spot uniformity, and can reduce the size of the light source system.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a light source system, comprising:

[0007] A first laser and a second laser, wherein the first laser is used to emit at least two different wavelengths of laser beams, and the different laser beams emitted by the first laser have different polarization directions, and the laser beams emitted by the first laser include a first laser beam having a first wavelength.

[0008] The second laser is used to emit a second laser beam with a first wavelength, the polarization direction of the second laser beam being the same as that of the first laser beam;

[0009] A polarization beam combining assembly includes a polarization adjustment element and a polarization beam combining element. The polarization adjustment element is disposed on the light-emitting side of one of the first laser and the second laser to change the polarization direction of one of the first laser beam and the second laser beam. The polarization beam combining element is located on the light-emitting path of the first laser and the second laser. The polarization beam combining element is configured to reflect one of the laser beams of the first laser and the second laser and transmit the laser beam of the other.

[0010] A beam homogenizer is used to homogenize the laser beam emitted after passing through a polarizing beam combiner.

[0011] The beneficial effects of this invention are as follows: By changing the polarization direction of the first laser beam in the second laser and the second laser beam in the second laser with the same wavelength and polarization direction through a polarization adjustment element, the first laser beam and the second laser beam become laser beams with the same wavelength but different polarization directions. Then, a polarizing combiner combines the first laser beam and the second laser beam with different polarization directions, and the combined laser beam is guided to a homogenizing component. When the polarization directions of the laser beams are different, the speckle problem of the laser can be reduced. Furthermore, the addition of a second laser can enhance the color matching of the entire light source system, thereby increasing the brightness of the light source system. Simultaneously, this design can reduce the number of lenses, thereby reducing the manufacturing cost of the light source system and correspondingly reducing its size.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] In some alternative implementations, the laser beam emitted by the first laser includes a third laser beam having a second wavelength, the polarization direction of which is different from that of the first laser beam.

[0014] In some alternative embodiments, a polarization adjustment element is disposed in the output optical path of the first laser beam in the first laser, and the polarization adjustment element is used to change the polarization direction of the first laser beam.

[0015] In some alternative implementations, the first laser beam has a first polarization direction, and the third laser beam has a second polarization direction;

[0016] The polarization adjustment element is used to adjust a first laser beam having a first polarization direction into a first laser beam having a second polarization direction;

[0017] A polarization adjustment element is disposed in the output optical path of a portion of the third laser beam in the first laser. The polarization adjustment element is used to adjust the portion of the third laser beam having a second polarization direction into a third laser beam having a first polarization direction.

[0018] In some alternative implementations, the polarization adjustment element is a half-wave plate.

[0019] In some alternative implementations, there are two first lasers, which are spaced apart along a first direction, and a second laser is located between the two first lasers, wherein the first direction is the light emission direction of the first lasers.

[0020] In some alternative implementations, the polarization combining assembly further includes a prism located on the incident side of the polarization combining element, which is used to adjust a portion of the laser beam.

[0021] In some alternative implementations, the light-diffusing assembly includes a diffuser, a lens, and a diffuser wheel;

[0022] The diffuser is located on the light-emitting side of the polarizing light combining element, and the lens is located between the diffuser and the diffuser wheel;

[0023] The polarization combining element is used to reflect the laser beam to the diffuser, the diffuser is used to uniformly project the received laser beam onto the lens, and the lens is used to converge the received laser beam onto the diffuser wheel.

[0024] Secondly, the present invention also provides a light source system, comprising:

[0025] A laser array group, which includes multiple lasers, emits laser beams;

[0026] The polarization combining component includes a polarization combining element and a polarization adjustment element. The polarization adjustment element is used to adjust the polarization direction of laser beams from multiple lasers so that laser beams with the same polarization direction are adjusted into laser beams with different polarization directions. The polarization combining element is used to combine laser beams with different polarization directions.

[0027] Beam homogenization component: The beam homogenization component is used to homogenize the laser beam after beam mixing.

[0028] Thirdly, the present invention also provides a laser projection device, comprising:

[0029] The light source system is the aforementioned light source system, which is used to provide a laser beam to the optomechanical illumination system;

[0030] An optomechanical illumination system is used to modulate the laser beam provided by the light source system into an image beam and then emit it to the imaging system.

[0031] An imaging system is used to image a beam of light and project it onto a projection screen.

[0032] The present invention provides a light source system and a laser projection device, wherein the laser projection device includes: a light source system, the light source system being the aforementioned light source system, the light source system being used to provide a laser beam to an optomechanical illumination system; an optomechanical illumination system, the optomechanical illumination system being used to modulate the laser beam provided by the light source system into an image beam and then emit it to an imaging system; and an imaging system, the imaging system being used to image the image beam and then emit it to a projection screen. The light source system includes a first laser and a second laser. The first laser emits laser beams of at least two different wavelengths, and the different laser beams emitted by the first laser have different polarization directions. The laser beams emitted by the first laser include a first laser beam with a first wavelength. The second laser emits a second laser beam with a first wavelength, and the polarization direction of the second laser beam is the same as that of the first laser beam. A polarization combining component includes a polarization adjustment element and a polarization combining element. The polarization adjustment element is disposed on the light-emitting side of one of the first laser and the second laser to change the polarization direction of one of the first laser beam and the second laser beam. The polarization combining element is located on the light-emitting path of the first laser and the second laser and is configured to reflect one of the laser beams of the first laser and the second laser and transmit the laser beam of the other. A homogenizing component is used to homogenize the laser beam emitted by the polarization combining element.

[0033] By using the above configuration—that is, by changing the polarization direction of the first laser beam in the second laser and the second laser beam in the second laser with the same wavelength and polarization direction through a polarization adjustment element—the first laser beam and the second laser beam become laser beams with the same wavelength but different polarization directions. Then, a polarizing combiner combines the first laser beam and the second laser beam with different polarization directions, and the combined laser beam is guided to a homogenizing component. When the polarization directions of the laser beams are different, the speckle problem of the laser can be reduced. Furthermore, the addition of a second laser can enhance the color scheme of the entire light source system, thereby increasing the brightness of the light source system. Simultaneously, this design can reduce the number of lenses, thus reducing the manufacturing cost of the light source system and correspondingly reducing its size. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a light source system in the prior art;

[0036] Figure 2 This is a schematic diagram of the structure of a light source system provided in an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the structure of the second type of light source system provided in the embodiments of this application;

[0038] Figure 4 This is a schematic diagram of the structure of the third light source system provided in the embodiments of this application;

[0039] Figure 5 This is a schematic diagram of the structure of the fourth light source system provided in the embodiments of this application;

[0040] Figure 6 This is a schematic diagram of the structure of the fifth light source system provided in the embodiments of this application;

[0041] Figure 7 The light spot diagram of the first laser in the light source system provided in the embodiments of this application before beam combining;

[0042] Figure 8 The light spot diagram after the first laser and the second laser are combined in the light source system provided in the embodiments of this application;

[0043] Figure 9 This is a schematic diagram of the sixth light source system provided in the embodiments of this application;

[0044] Figure 10 This is a schematic diagram of the structure of the seventh light source system provided in the embodiments of this application;

[0045] Figure 11 This is a schematic diagram of the structure of the eighth light source system provided in the embodiments of this application;

[0046] Figure 12 This is a schematic diagram of the structure of the ninth light source system provided in the embodiments of this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 100 - Light source system;

[0049] 110 - First laser;

[0050] 111 - First laser beam;

[0051] 112 - Third laser beam;

[0052] 120 - Second laser;

[0053] 121 - Second laser beam;

[0054] 130-polarization beam combining component;

[0055] 131 - Polarization adjustment element;

[0056] 132-Polarization combining element;

[0057] 133-Prism;

[0058] 140-Uniform Light Component;

[0059] 141-Diffusion sheet;

[0060] 142-Lens;

[0061] 143 - Diffusion Wheel;

[0062] 144 - Optical guide tube;

[0063] 150-Reflective sheet;

[0064] 160-lens. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features can be combined with each other.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Figure 1 This is a schematic diagram of the structure of a light source system in the prior art, such as... Figure 1 As shown, currently, to ensure the display brightness of the projected image in the light source system, due to laser design limitations, the current RGB ratio mainly relies on the laser chip. Therefore, it is necessary to add a laser with a certain color scheme, i.e., a monochromatic laser. The light source system typically includes: a three-color laser, a monochromatic laser, a beam combiner, and a beam homogenizer. To ensure uniform distribution of the beam spots from the three-color and monochromatic lasers, prisms are used, and beam combining is achieved through reflectors. To ensure the required beam homogenization, a set of mirrors 160 is added after the diffuser 141. For example, a beam shrinking or beam expanding mirror is added. This set of mirrors achieves uniform distribution of the incident beam spot. The beam homogenizer homogenizes the laser from the beam combiner and guides it to the optomechanical system. However, in existing light source systems, due to the use of reflectors 150 for beam combining and the addition of mirrors 160 to ensure beam uniformity, the size of the light source system and the number of mirrors are greatly increased, resulting in a poor user experience.

[0070] To overcome the shortcomings of existing technologies, the light source system and laser projection device provided by this invention change the polarization direction of the first laser beam in the second laser and the second laser beam in the second laser with the same wavelength and polarization direction through a polarization adjustment element. This makes the first laser beam and the second laser beam have the same wavelength but different polarization directions. Then, a polarizing combiner combines the first laser beam and the second laser beam with different polarization directions, and guides the combined laser beam to a homogenizing component. When the polarization directions of the laser beams are different, the speckle problem of the laser can be reduced. Furthermore, the addition of a second laser can enhance the color matching of the entire light source system, thereby increasing the brightness of the light source system. At the same time, this design can reduce the number of lenses, thereby reducing the manufacturing cost of the light source system and correspondingly reducing the size of the light source system.

[0071] The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the present invention.

[0072] Figure 2 This is a schematic diagram of a light source system provided in an embodiment of this application. Figure 3 This is a schematic diagram of the structure of the second light source system provided in the embodiments of this application. Figure 4 This is a schematic diagram of the structure of the third light source system provided in the embodiments of this application. Figure 5 This is a schematic diagram of the structure of the fourth light source system provided in the embodiments of this application. Figure 6 This is a schematic diagram of the structure of the fifth light source system provided in the embodiments of this application. Figure 7 This is a light spot diagram of the first laser in the light source system provided in the embodiments of this application before beam combining. Figure 8 The image shows the light spot pattern after the first laser and the second laser are combined in the light source system provided in the embodiments of this application.

[0073] like Figures 2 to 8 As shown, this application embodiment provides a light source system 100, including:

[0074] A first laser 110 and a second laser 120, wherein the first laser 110 is used to emit at least two different wavelengths of laser beams, and the different laser beams emitted by the first laser 110 have different polarization directions, and the laser beams emitted by the first laser 110 include a first laser beam 111 having a first wavelength.

[0075] It should be noted that the first laser 110 is a tri-color laser, which can emit red laser, blue laser and green laser.

[0076] In addition, it should be noted that the polarization direction of red laser is different from that of blue and green lasers, as is its wavelength.

[0077] The second laser 120 is used to emit a second laser beam 121 having a first wavelength, the polarization direction of the second laser beam 121 being the same as the polarization direction of the first laser beam 111.

[0078] It should be noted that the second laser 120 is a monochromatic laser. A monochromatic laser refers to a laser that uses a single blue laser beam to excite the yellow phosphor and green phosphor on the phosphor wheel, thereby producing a red, green and blue laser beam.

[0079] Correspondingly, the second laser 120, i.e., the three-color laser, uses red, green, and blue lasers to emit red, green, and blue laser beams respectively. Since the laser beam emitted by any one of the three lasers has excellent monochromaticity, by selecting a suitable wavelength, it can be ensured that the emitted red, green, and blue laser beams are almost free of stray light. Therefore, compared to monochromatic lasers, three-color lasers have the advantages of higher color gamut and higher brightness, making them increasingly widely used in laser projection equipment.

[0080] In addition, it should be noted that the first laser beam 111 and the second laser beam 121 can both be any one of red laser, blue laser and green laser. Specifically, they can be adjusted according to the actual situation, and no further restrictions are imposed here.

[0081] Specifically, in the embodiments of this application, the second laser beam 121 is a monochromatic laser, whose main function is to supplement the light source system 100 with a certain laser color, thereby increasing the brightness. Therefore, the first laser beam 111 and the second laser beam 121 can both be red lasers, or blue lasers, or green lasers.

[0082] Of course, for ease of explanation, in this embodiment of the application, the second laser beam 121 is red as an example for illustration.

[0083] The polarization beam combining assembly 130 includes a polarization adjustment element 131 and a polarization combining element 132. The polarization adjustment element 131 is disposed on the light-emitting side of one of the first laser 110 and the second laser 120 to change the polarization direction of one of the first laser beam 111 and the second laser beam 121. The polarization combining element 132 is located on the light-emitting path of the first laser 110 and the second laser 120. The polarization combining element 132 is configured to reflect one of the laser beams of the first laser 110 and the second laser 120 and transmit the laser beam of the other.

[0084] refer to Figure 2The polarization adjustment element 131 is disposed on the light-emitting side of the first laser 110 to change the polarization direction of the first laser beam 111. The polarization combining element 132 is located on the light-emitting path of the first laser 110 and the second laser 120. The polarization combining element 132 is configured to reflect the laser beam of the first laser 110 and transmit the laser beam of the second laser 120.

[0085] refer to Figure 3 The polarization adjustment element 131 is disposed on the light-emitting side of the second laser 120 to change the polarization direction of the second laser beam 121. The polarization combining element 132 is located on the light-emitting path of the first laser 110 and the second laser 120. The polarization combining element 132 is configured to reflect the laser beam of the first laser 110 and transmit the laser beam of the second laser 120.

[0086] It should be noted that the polarization adjustment element 131 is used to change the polarization direction of one of the first laser beam 111 and the second laser beam 121 so that the two can be polarized and combined. Specifically, the placement of the polarization adjustment element 131 is not limited in this embodiment.

[0087] In addition, considering the ease of processing or installation, such as Figure 4 As shown, the polarization adjustment element 131 can be divided into two, which are located on the light-emitting side of the two second laser beams 121 of the second laser 120, respectively.

[0088] It should be noted that since the red laser emitted by the first laser beam 111 and the second laser beam 121 has the same polarization mode, the laser beams emitted by the first laser beam 111 and the second laser 120 will interfere with each other in the subsequent optical path, causing speckle to easily occur in the subsequent optical path, which in turn leads to poor display effect of the projected image from the laser projection device.

[0089] Therefore, in order to achieve different polarization directions when the first laser beam 111 and the second laser beam 121 are projected onto the polarization combining element 132, in some embodiments, the polarization combining assembly 130 may further include a polarization adjustment element 131, which is located on the incident light side of the polarization combining element 132. The polarization adjustment element 131 is used to adjust the polarization direction of the first laser beam 111 or the second laser beam 121.

[0090] Furthermore, it should be noted that in the light source system 100 provided in this application embodiment, the polarization direction of the first laser beam 111 of the first laser 110 is controlled so that the polarization direction of the first laser beam 111 of the first laser 110 and the polarization direction of the second laser beam 121 of the second laser 120 are changed from being the same to two different polarization directions. This allows the polarization combining element 132 to combine the laser beams with different polarization directions and guide the combined laser beam to the homogenizing component 140. When the polarization directions of the laser beams are different, the speckle problem of the laser can be reduced.

[0091] Furthermore, the first laser beam 111 and the second laser beam 121 have the same wavelength, which is the first wavelength. Thus, when laser beams with the same wavelength but different polarization directions are projected onto the polarization combining element 132, the speckle problem of the laser beam emitted from the polarization combining element 132 is relatively small.

[0092] The homogenizing component 140 is used to homogenize the laser beam emitted by the polarizing beam combining element 132.

[0093] It should be noted that the light is combined by the polarization light combining element 132 and then the light spot is adjusted by the light homogenizing component 140, which has a simple and compact structure and good light homogenizing effect.

[0094] With the above configuration, the polarization directions of the first laser beam 111 and the second laser beam 121 in the second laser 120, which have the same wavelength and polarization direction, are changed by the polarization adjustment element 131. This makes the first laser beam 111 and the second laser beam 121 laser beams with the same wavelength but different polarization directions. Then, the first laser beam 111 and the second laser beam 121 with different polarization directions are combined by a polarizing combiner, and the combined laser beam is guided to the homogenizing component 140. When the polarization directions of the laser beams are different, the speckle problem of the laser can be reduced. Furthermore, the addition of the second laser 120 can increase a certain color scheme in the entire light source system 100, thereby increasing the brightness of the light source system 100. At the same time, this design can reduce the number of lenses, thereby reducing the manufacturing cost of the light source system 100 and correspondingly reducing the size of the light source system 100.

[0095] like Figures 2 to 8 As shown, in some optional embodiments, the laser beam emitted by the first laser 110 includes a third laser beam 112 having a second wavelength, the polarization direction of the third laser beam 112 being different from the polarization direction of the first laser beam 111.

[0096] It should be noted that the second laser 120 is a monochromatic laser. For ease of understanding, the laser beam emitted by the second laser 120 may also include a fourth laser beam with a second wavelength. The polarization direction of the third laser beam 112 is the same as that of the fourth laser beam; the polarization direction of the fourth laser beam is different from that of the second laser beam 121.

[0097] The second laser 120 can emit a second laser beam 121 or a fourth laser beam, which can be adjusted according to the actual situation.

[0098] It should be noted that the third laser beam 112 can have at least two rows, and the third laser beam 112 includes a blue laser beam and a green laser beam; the fourth laser beam can have at least two rows, and the fourth laser beam includes a blue laser beam and a green laser beam.

[0099] The polarization directions of the blue and green laser beams of the third laser beam 112 are different from those of the red laser beam of the first laser beam 111. Correspondingly, the polarization directions of the blue and green laser beams of the fourth laser beam are different from those of the red laser beam of the second laser beam 121.

[0100] In some alternative embodiments, the polarization adjustment element 131 is disposed in the output optical path of the first laser beam 111 in the first laser 110, and the polarization adjustment element 131 is used to change the polarization direction of the first laser beam 111.

[0101] It should be noted that the first laser beam 111 and the second laser beam 121 have the same wavelength, both being the first wavelength. Therefore, by changing the polarization direction of one of the first laser beam 111 and the second laser beam 121 through the polarization adjustment element 131, the first laser beam 111 and the second laser beam 121 are combined. In this way, when laser beams with the same wavelength but different polarization directions are projected onto the polarization combining element 132, the speckle problem of the laser beam emitted by the polarization combining element 132 is relatively small.

[0102] Specifically, the polarization adjustment element 131 is located in the output optical path of the first laser beam 111 of the first laser 110. Correspondingly, the polarization adjustment element 131 is used to adjust the polarization direction of the red laser beam in the first laser beam 111 from the same polarization direction as the red laser beam in the second laser beam 121 to a polarization direction that is different from the polarization direction of the red laser beam in the second laser beam 121.

[0103] like Figures 2 to 8 As shown, in some optional embodiments, the first laser beam 111 has a first polarization direction, and the third laser beam 112 has a second polarization direction.

[0104] The polarization adjustment element 131 is used to adjust the first laser beam 111 having a first polarization direction into a first laser beam 111 having a second polarization direction;

[0105] A polarization adjustment element 131 is disposed on the output optical path of a portion of the third laser beam 112 in the first laser 110. The polarization adjustment element 131 is used to adjust the portion of the third laser beam 112 having a second polarization direction into a third laser beam 112 having a first polarization direction.

[0106] It should be noted that the first polarization direction is the P-polarization direction, and the second polarization direction is the S-polarization direction.

[0107] Accordingly, the polarization direction of the first laser beam 111 of the first laser 110 is P-polarization, and the polarization direction of the third laser beam 112 of the first laser 110 is S-polarization; the polarization direction of the second laser beam 121 of the second laser 120 is P-polarization, and the polarization direction of the fourth laser beam of the second laser 120 is S-polarization.

[0108] It should be noted that the blue and green laser beams in the third laser beam 112 are combined with the red laser beams in the first laser beam 111 and the second laser beam 121 using a wavelength combining method.

[0109] Of course, the combination of the blue laser beam and the green laser beam in the third laser beam 112 can also be achieved by polarization combining. This embodiment of the application does not impose too many restrictions here, and can be adjusted according to the actual situation.

[0110] In this scenario, both the first laser beam 111 and the second laser beam 121 are red laser beams, and the polarization direction of the red laser beams in the first laser beam 111 and the second laser beam 121 in the current light source system 100 is the P-polarization direction, while the polarization direction of the blue laser beam and the green laser beam in the third laser beam 112 and the fourth laser beam is the S-polarization direction.

[0111] It should be noted that, for ease of understanding, P-polarization and S-polarization are explained here. When light penetrates the surface of an optical element at a non-perpendicular angle, both reflection and transmission characteristics depend on polarization. In this case, the coordinate system used is defined by the plane containing the input and reflected beams. If the polarization vector of the light ray lies in this plane, it is called p-polarization; if the polarization vector is perpendicular to the plane, it is called s-polarization.

[0112] In some embodiments, when it is necessary to combine the first laser beam 111 of the first laser 110 and the second laser beam 121 of the second laser 120, it means that the light source system 100 needs to supplement the second laser beam 121 to increase the brightness.

[0113] Specifically, the polarization direction of the red laser beam in the first laser beam 111 can be adjusted from the P-polarization direction to the S-polarization direction. In this way, the polarization direction of the red laser beam projected by the first laser beam 111 onto the polarization combining element 132 is the S-polarization direction, while the polarization direction of the red laser beam projected by the second laser beam 121 onto the polarization combining element 132 is still the P-polarization direction. This achieves that the polarization directions of the red laser beams projected by the first laser 110 and the second laser 120 onto the polarization combining element 132 are different.

[0114] In other embodiments, when it is necessary to combine the third laser beam 112 of the first laser 110 with the fourth laser beam of the second laser 120, it means that the light source system 100 needs to supplement the fourth laser beam to increase the brightness.

[0115] Specifically, the polarization directions of the blue and green laser beams in the third laser beam 112 can be adjusted from S-polarization to P-polarization. This way, the blue and green laser beams projected by the third laser beam 112 onto the polarization combining element 132 are polarized in the P-polarization direction, while the blue and green laser beams projected by the second laser beam 121 onto the polarization combining element 132 are still polarized in the S-polarization direction. This achieves that the polarization directions of the blue and green laser beams projected by the first laser 110 and the second laser 120 onto the polarization combining element 132 are different.

[0116] In some alternative implementations, the polarization adjustment element 131 is a half-wave plate.

[0117] For example, polarization adjustment element 131 includes a half-wave plate. The half-wave plate can rotate polarized light. Since linearly polarized light is incident perpendicularly to the half-wave plate, the transmitted light is still linearly polarized light. If the angle between the vibration plane and the principal section of the crystal at the time of incidence is θ, then the vibration plane of the transmitted linearly polarized light will rotate from its original orientation by an angle of 2θ.

[0118] It should be noted that the polarization adjustment element 131 can be a quarter-wave plate.

[0119] like Figures 2 to 8As shown, in some optional embodiments, there are two first lasers 110, which are spaced apart along a first direction, and a second laser 120 is located between the two first lasers 110, wherein the first direction is the light emission direction of the first lasers 110.

[0120] It should be noted that, in order to improve the color gamut of the light source system 100, there are two first lasers 110, which means that the light source system 100 has two tri-color lasers, of which the monochromatic laser, namely the second laser 120, is located between the two first lasers 110.

[0121] refer to Figure 6 The second laser beam 121 in the second laser 120 consists of at least two parts. A portion of the polarization adjustment element 131 is located on the light-emitting side of the portion of the second laser beam 121 in the second laser 120, so that the second laser beam 121 in the portion of the second laser 120 combines with the first laser beam 111 of one of the two first lasers 110 without the polarization adjustment element 131. The other portion of the polarization adjustment element 131 is located on the light-emitting side of the first laser beam 111 of one of the two first lasers 110, so that the second laser beam 121 in the second laser 120 without the polarization adjustment element 131 combines with the first laser beam 111 of one of the two first lasers 110 with the polarization adjustment element 131.

[0122] In some embodiments, the light source system 100 needs to supplement a second laser beam 121 to increase brightness. Specifically, a portion of the second laser beam 121 in the second laser 120 combines with the first laser beam 111 of one of the two first lasers 110, and another portion of the second laser beam 121 in the second laser 120 combines with the first laser beam 111 of the other of the two first lasers 110.

[0123] Of course, in some other embodiments, the light source system 100 needs to be supplemented with a fourth laser beam to increase brightness. Specifically, a portion of the fourth laser beam in the second laser 120 is combined with the third laser beam 112 of one of the two first lasers 110, and another portion of the fourth laser beam in the second laser 120 is combined with the third laser beam 112 of the other of the two first lasers 110.

[0124] It should be noted that when the third laser beams 112 in the two first lasers 110 are combined, the polarization adjustment element 131 needs to adjust the polarization direction of the third laser beam 112 in one of the two first lasers 110, so that the third laser beam 112 in one of the two first lasers 110 is adjusted from the S polarization direction to the P polarization direction, while the third laser beam 112 in the other first laser 110 remains in the S polarization direction. This results in the blue laser beam and the green laser beam when the other first laser 110 is projected onto the polarization combining element 132 having different polarization directions, which can improve the speckle effect.

[0125] Figure 9 This is a schematic diagram of the sixth light source system provided in the embodiments of this application. Figure 10 This is a schematic diagram of the structure of the seventh light source system provided in the embodiments of this application.

[0126] In some embodiments, the second laser 120 may be arranged side-by-side with one of the first lasers 110, such as... Figure 9 and Figure 10 As shown.

[0127] Specifically, if Figure 9 When the second laser 120 is positioned close to the homogenizing component 140, a polarized beam combining method is used for beam combining. The specific beam combining method can depend on the position of the second laser 120.

[0128] In other embodiments, Figure 11 This is a schematic diagram of the structure of the seventh light source system provided in the embodiments of this application. Figure 12 This is a schematic diagram of the ninth light source system provided in the embodiments of this application. There can be three first lasers 110; for specific details, please refer to... Figure 11 and Figure 12 As shown.

[0129] like Figures 1 to 12 As shown, in some optional embodiments, the polarization beam combining assembly 130 further includes a prism 133 located on the incident side of the polarization beam combining element 132, and the prism 133 is used to adjust a portion of the laser beam.

[0130] It should be noted that the combined light, after being adjusted by prism 133, can make the light spot more uniform. Prism 133 can adjust the direction and intensity of the light as needed to achieve the desired light spot effect.

[0131] Specifically, after the laser, adjusted by the prism 133, is guided to the homogenizing component 140 by the light combining component, the homogenizing component 140 can better homogenize the laser, so that the homogenizing component 140 has a better homogenization effect on the laser emitted by the first laser 110 and the second laser 120, thereby ensuring that the display effect of the projected image projected by the laser projection device equipped with this light source system 100 is better.

[0132] like Figures 1 to 12 As shown, in some optional embodiments, the light-diffusing assembly 140 includes a diffuser 141, a lens 142, a diffuser wheel 143, and a light guide 144.

[0133] The diffuser 141 is located on the light-emitting side of the polarizing light combining element 132, and the lens 142 is located between the diffuser 141 and the diffuser wheel 143.

[0134] The polarization combining element 132 is used to reflect the laser beam to the diffuser 141. The diffuser 141 is used to uniformly project the received laser beam onto the lens 142. The lens 142 is used to converge the received laser beam onto the diffuser wheel 143. The diffuser wheel 143 is used to uniformly project the received beam onto the light guide 144.

[0135] It should be noted that the polarization combining element 132 is used to project a laser beam onto the diffuser 141, the diffuser 141 is used to uniformly project the received laser beam onto the lens 142, the lens 142 is used to converge the received laser beam onto the diffuser wheel 143, and the diffuser wheel 143 is used to uniformly project the received beam onto the light guide 144.

[0136] It should be noted that the diffuser 141 can initially homogenize the laser beam from the beam combining component and guide the initially homogenized laser beam to the lens 142. The lens 142 can be located between the diffuser 141 and the diffuser wheel 143. The lens 142 can converge the laser beam initially homogenized by the diffuser 141 and guide the converged laser beam to the diffuser wheel 143 in the beam homogenizing component 140. The diffuser wheel 143 homogenizes the received beam again. The homogenized laser beam is then projected onto the light guide 144, where it is further homogenized. Finally, the laser beam is homogenized by the light guide 144, resulting in a better homogenization effect.

[0137] Specifically, the laser beam emitted from the polarizing beam combining element 132 can be directed towards the diffuser 141, which homogenizes the incoming laser beam before directing it towards the lens 142. The lens 142 is used to focus the laser beam emitted from the diffuser 141 onto the light-incident surface of the light guide 144.

[0138] The diffuser wheel 143 (also known as the rotatable diffuser plate 141) is located between the lens 142 and the light guide 144. The diffuser wheel 143 can diffuse the beam that is converging, increase the divergence angle of the beam, and increase the random phase.

[0139] Thus, with a diffuser 141 in the front optical path, the laser beam, after being homogenized, is focused by the lens 142 and incident on the diffuser wheel 143. The laser beam first passes through a stationary diffuser 141 and then through a moving diffuser 141. In this way, based on the homogenization of the beam by the stationary diffuser 141, the laser beam is further diffused and homogenized, which can enhance the homogenization effect of the laser beam, reduce the energy ratio of the beam near the optical axis of the laser beam, thereby reducing the coherence of the laser beam and significantly improving the speckle phenomenon in the projected image.

[0140] Furthermore, the light guide 144 is a hollow tubular device, and light is reflected multiple times inside the light guide 144 to achieve a uniform light effect. In this way, the light source system 100 can use the lens 142 to shape the laser beam combined by the polarization combining element 132, making the difference between the width of the shaped laser beam's spot in the slow axis direction and its width in the fast axis direction smaller. Thus, after the shaped laser beam passes through the light guide 144, the uniformity of the laser beam is even higher.

[0141] In addition, it should be noted that this scheme can also be used in compound eye illumination systems, using compound eyes instead of light guides 144 for light homogenization, and then incident on the optomechanical illumination system.

[0142] It should be noted that when the homogenizing component 140 includes a compound eye lens, the laser beam emitted from the beam combining component can be directly directed to the compound eye lens. The compound eye lens can homogenize the laser beams emitted by each laser unit.

[0143] The light source system provided in this application includes: a first laser and a second laser. The first laser emits laser beams of at least two different wavelengths, and the different laser beams emitted by the first laser have different polarization directions. The laser beams emitted by the first laser include a first laser beam with a first wavelength. The second laser emits a second laser beam with a first wavelength, and the polarization direction of the second laser beam is the same as that of the first laser beam. A polarization combining component includes a polarization adjustment element and a polarization combining element. The polarization adjustment element is disposed on the light-emitting side of one of the first laser and the second laser to change the polarization direction of one of the first laser beam and the second laser beam. The polarization combining element is located on the light-emitting path of the first laser and the second laser and is configured to reflect one of the laser beams of the first laser and the second laser and transmit the laser beam of the other. A homogenizing component is used to homogenize the laser beam emitted by the polarization combining element.

[0144] By using the above configuration, the polarization directions of the first laser beam in the second laser and the second laser beam in the second laser, which have the same wavelength and polarization direction, are changed by a polarization adjustment element. This results in the first and second laser beams having the same wavelength but different polarization directions. A polarizing combiner then combines the first and second laser beams with different polarization directions, and the combined laser beam is guided to a homogenizing component. When the polarization directions of the laser beams are different, the speckle problem of the laser can be reduced. Furthermore, the addition of a second laser can enhance the color scheme of the entire light source system, thereby increasing the brightness of the system. Simultaneously, this design reduces the number of lenses, thus reducing the manufacturing cost and correspondingly decreasing the size of the light source system.

[0145] In addition, such as Figures 1 to 12 As shown, this application embodiment also provides a light source system 100, including:

[0146] A laser array group, which includes multiple lasers, emits laser beams;

[0147] The polarization combining component 130 includes a polarization combining element 132 and a polarization adjustment element 131. The polarization adjustment element 131 is used to adjust the polarization direction of the laser beams of multiple lasers so that the laser beams with the same polarization direction are adjusted into laser beams with different polarization directions. The polarization combining element 132 is used to combine laser beams with different polarization directions.

[0148] The homogenizing component 140 is used to homogenize the laser beam after beam mixing.

[0149] The light source system provided in this application includes: a laser array group, which includes multiple lasers that emit laser beams; a polarization combining component, which includes a polarization combining element and a polarization adjustment element. The polarization adjustment element is used to adjust the polarization direction of some laser beams from the multiple lasers so that laser beams with the same polarization direction are adjusted into laser beams with different polarization directions. The polarization combining element is used to combine laser beams with different polarization directions; and a homogenizing component, which is used to homogenize the combined laser beam.

[0150] By altering the polarization directions of the first and second laser beams in a second laser with the same wavelength and polarization direction using a polarization adjustment element, the first and second laser beams become laser beams of the same wavelength but with different polarization directions. These beams are then combined using a polarizing combiner, and the combined beam is guided to a homogenizing component. When the laser beams have different polarization directions, the speckle problem can be reduced. Furthermore, the addition of a second laser can enhance the color scheme of the entire light source system, thereby increasing its brightness. Simultaneously, this design reduces the number of lenses, thus lowering the manufacturing cost and consequently reducing the size of the light source system.

[0151] Furthermore, embodiments of this application also provide a laser projection device, including:

[0152] The light source system 100 is the light source system 100 described above, and the light source system 100 is used to provide a laser beam to the optomechanical illumination system;

[0153] An optomechanical illumination system is used to modulate the laser beam provided by the light source system 100 into an image beam and then emit it to the imaging system.

[0154] An imaging system is used to image a beam of light and project it onto a projection screen.

[0155] The specific structure, working principle and function of the light source system 100 have been described in detail in the aforementioned Embodiment 1, and will not be repeated here.

[0156] The laser projection device provided in this application includes: a light source system, which is the light source system described above, and is used to provide a laser beam to an optomechanical illumination system; an optomechanical illumination system, which is used to modulate the laser beam provided by the light source system into an image beam and then emit it to an imaging system; and an imaging system, which is used to image the image beam and then emit it to a projection screen.

[0157] By using the above configuration—that is, by changing the polarization direction of the first laser beam in the second laser and the second laser beam in the second laser with the same wavelength and polarization direction through a polarization adjustment element—the first laser beam and the second laser beam become laser beams with the same wavelength but different polarization directions. Then, a polarizing combiner combines the first laser beam and the second laser beam with different polarization directions, and the combined laser beam is guided to a homogenizing component. When the polarization directions of the laser beams are different, the speckle problem of the laser can be reduced. Furthermore, the addition of a second laser can enhance the color scheme of the entire light source system, thereby increasing the brightness of the light source system. Simultaneously, this design can reduce the number of lenses, thus reducing the manufacturing cost of the light source system and correspondingly reducing its size.

[0158] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0159] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light source system, characterized in that, include: A first laser and a second laser, wherein the first laser is used to emit at least two different wavelengths of laser beams, and the different laser beams emitted by the first laser have different polarization directions, and the laser beams emitted by the first laser include a first laser beam having a first wavelength. The second laser is used to emit a second laser beam having the first wavelength, and the polarization direction of the second laser beam is the same as that of the first laser beam. A polarization beam combining assembly includes a polarization adjustment element and a polarization combining element. The polarization adjustment element is disposed on the light-emitting side of one of the first laser and the second laser to change the polarization direction of one of the first laser beam and the second laser beam, so that the first laser beam and the second laser beam are laser beams of the same wavelength but with different polarization directions. The polarization combining element is located on the light-emitting path of the first laser and the second laser, and the polarization combining element is configured to reflect one of the laser beams of the first laser and the second laser and transmit the laser beam of the other. A beam homogenizing component, wherein the beam homogenizing component is used to homogenize the laser beam emitted through the polarizing beam combining element; There are two first lasers, which are spaced apart along a first direction, and the second laser is located between the two first lasers, wherein the first direction is the light emission direction of the first laser.

2. The light source system according to claim 1, characterized in that, The laser beam emitted by the first laser includes a third laser beam having a second wavelength, the polarization direction of which is different from that of the first laser beam.

3. The light source system according to claim 2, characterized in that, The polarization adjustment element is disposed in the output optical path of the first laser beam in the first laser, and the polarization adjustment element is used to change the polarization direction of the first laser beam.

4. The light source system according to claim 3, characterized in that, The first laser beam has a first polarization direction, and the third laser beam has a second polarization direction; The polarization adjustment element is used to adjust the first laser beam having a first polarization direction into the first laser beam having a second polarization direction. The polarization adjustment element is disposed in the output optical path of a portion of the third laser beam in the first laser, and the polarization adjustment element is used to adjust the portion of the third laser beam having a second polarization direction into a third laser beam having a first polarization direction.

5. The light source system according to any one of claims 1-4, characterized in that, The polarization adjustment element is a half-wave plate.

6. The light source system according to any one of claims 1-4, characterized in that, The polarization beam combining assembly also includes a prism located on the incident side of the polarization beam combining element, and the prism is used to adjust a portion of the laser beam.

7. The light source system according to any one of claims 1-4, characterized in that, The light-diffusing component includes a diffuser, a lens, and a diffuser wheel; The diffuser is located on the light-emitting side of the polarizing light combining element, and the lens is located between the diffuser and the diffuser wheel; The polarization combining element is used to reflect the laser beam to the diffuser, the diffuser is used to uniformly project the received laser beam onto the lens, and the lens is used to converge the received laser beam onto the diffuser wheel.

8. A light source system, characterized in that, include: A laser array group, comprising multiple lasers, wherein the multiple lasers emit laser beams; a first laser and a second laser among the multiple lasers emit laser beams with the same wavelength and the same polarization direction. A polarization combining component includes a polarization combining element and a polarization adjustment element. The polarization adjustment element is disposed on the light-emitting side of one of the first laser and the second laser. The polarization adjustment element is used to adjust the polarization direction of some laser beams from multiple lasers so that laser beams with the same polarization direction are adjusted into laser beams with different polarization directions. The polarization combining element is used to combine laser beams with different polarization directions. A beam homogenizing component, used to homogenize the combined laser beam; There are two first lasers, which are spaced apart along a first direction, and the second laser is located between the two first lasers, wherein the first direction is the light emission direction of the first laser.

9. A laser projection device, characterized in that, include: A light source system, wherein the light source system is the light source system according to any one of claims 1 to 8, the light source system being used to provide a laser beam to an optomechanical illumination system; An optomechanical illumination system, wherein the optomechanical illumination system is used to modulate the laser beam provided by the light source system into an image beam and then emit it to the imaging system; An imaging system is used to image the image beam and then project it onto a projection screen.

Images