Laser projection equipment

Abstract

The embodiment of the utility model belongs to the technology of laser projection equipment, and provides laser projection equipment, which comprises a laser light source, a light beam adjusting assembly and a projection lens, and is characterized in that the light beam adjusting assembly comprises a first light beam adjusting part and a second light beam adjusting part; the first light beam adjusting component is located on the light emitting side of the laser light source and used for emitting a first part of incident light in the first polarization direction and emitting a second part of the incident light to the second light beam adjusting component. The second light beam adjusting component is used for reflecting the second part to the first light beam adjusting component and enabling the second part to be emitted in a second polarization direction; the light beam adjusting assembly is configured to emit the first part in a first polarization direction and emit the second part in a second polarization direction, so that the first part and the second part with different polarization directions are emitted to the projection lens. Therefore, by repeatedly using the first light beam component, the light path design can be simplified, the size of the laser projection equipment can be reduced, and the miniaturization of the laser projection equipment can be conveniently realized.

Description

Technical Field

[0001] The embodiments of the present application relate to laser projection technology, and more particularly to a laser projection device. Background Art

[0002] At present, laser projection display technology is a new type of projection display technology on the market. Compared with light-emitting diode (LED) projection products, laser projection display technology has the characteristics of clear imaging, bright colors and higher brightness. These remarkable characteristics have gradually made laser projection display technology another mainstream development direction in the market.

[0003] Common light sources for laser projection equipment include three-color light sources and monochromatic light sources. Since three-color light sources use three pure-color lasers, R, G, and B, the color purity is higher, the color gamut of the projected image is higher, and the projection effect is better.

[0004] However, due to the high coherence of lasers, when laser light sources are used for projection display, a speckle effect will occur, which will affect the effect of the projection display. Utility Model Content

[0005] The embodiment of the present application provides a laser projection device, which can solve the technical problem in the related art that the laser has the characteristic of high coherence, and when a laser light source is used for projection display, a speckle effect will occur, which will affect the effect of the projection display.

[0006] In a first aspect, an embodiment of the present application provides a laser projection device, comprising:

[0007] A laser light source, for providing a light beam;

[0008] A beam adjustment component, located at the light-emitting side of the laser light source, for receiving the light beam;

[0009] A projection lens, located at the light-emitting side of the beam adjustment component, for receiving the light beam and projecting it onto an imaging surface;

[0010] Wherein, the beam adjustment component includes a first beam adjustment component and a second beam adjustment component;

[0011] The first beam adjustment component is located at the light output side of the laser light source, and is used to output the first part of the incident light in the first polarization direction, and output the second part of the incident light to the second beam adjustment component;

[0012] The second beam adjusting component is used to reflect the second part to the first beam adjusting component, and make the second part emerge in a second polarization direction; the light beam emerging from the first beam adjusting component includes at least a first polarization direction and a second polarization direction, and the two polarization directions are different;

[0013] The beam adjustment component is configured to emit the first part in the first polarization direction and emit the second part in the second polarization direction, so that the first part and the second part with different polarization directions are both emitted to the projection lens.

[0014] The laser projection device provided in the embodiment of the present application utilizes the characteristic that the first beam adjustment component has different transmission directions for the light beams with the same polarization direction, thereby changing the optical path of part of the light beam; and by adjusting the polarization direction of the light beam through the second beam adjustment component, the light beam incident on the projection lens can have different polarization directions, so as to reduce coherence and reduce speckle. Secondly, the laser projection device in the embodiment of the present application has a small number of components, which can simplify the structure of the optical path system and reduce the complexity of production and assembly on the one hand, and reduce the problem of optical path misalignment caused by component failure or position offset on the other hand, thereby improving the reliability and service life of the laser projection device system.

[0015] In some embodiments of the present application, the first polarization direction is perpendicular to the second polarization direction.

[0016] With such an arrangement, the first part and the second part can form a light beam with polarization directions perpendicular to each other, thereby eliminating the spatial coherence of the light beam and further reducing the coherence to reduce the speckle phenomenon.

[0017] In some embodiments of the present application, the proportion of the first part in the incident light is greater than or equal to 30%;

[0018] And / or, the proportion of the first part in the incident light is less than or equal to 70%.

[0019] Such a setting can reduce the speckle phenomenon and improve the uniformity and fineness of the image; in addition, it can balance the workload of the beam adjustment components, reduce the wear and aging of the optical components, and improve the stability and reliability of the system.

[0020] In some embodiments of the present application, the first beam adjusting component is used to reflect the first part to the projection lens in the first polarization direction, and transmit the second part to the second beam adjusting component;

[0021] The second beam adjusting component is located on the transmission light path of the first beam adjusting component, and is used for reflecting the second part to the first beam adjusting component and making the second part emerge in the second polarization direction.

[0022] With such an arrangement, the optical axis of the projection lens intersects with the optical path of the beam adjustment component, which is conducive to miniaturization of the laser projection device.

[0023] In some embodiments of the present application, the first beam adjusting component is used to transmit the first part to the projection lens in the first polarization direction, and reflect the second part to the second beam adjusting component;

[0024] The second beam adjusting component is located on the reflection light path of the first beam adjusting component, and is used for reflecting the second part to the first beam adjusting component and making the second part emerge in the second polarization direction.

[0025] With such an arrangement, the optical axis of the projection lens is coaxial with the optical path of the beam adjustment component, and modulation can be performed between the projection lens and the beam adjustment component through a reflector or a prism, so as to realize the miniaturization of the laser projection device.

[0026] In some embodiments of the present application, the second light beam adjustment component includes a reflector and a phase delay plate, and the phase delay plate is located on the light incident side of the reflector;

[0027] The phase retarder is used to emit the second part to the reflective sheet in the second polarization direction;

[0028] The reflective sheet is used to reflect the second part to the first beam adjusting component.

[0029] In some embodiments of the present application, along the light emitting direction of the second light beam adjusting component, the projections of the reflective sheet and the phase delay sheet do not overlap.

[0030] This arrangement ensures that the light beams will not interfere with each other when passing through the phase delay plate and the reflective plate, thereby ensuring the transmission quality of the light beam. In addition, this can optimize the optical path design and improve the efficiency and reliability of the system.

[0031] In some embodiments of the present application, the first beam adjustment component is used to transmit the first part to the projection lens in the first polarization direction, and reflect the second part to the phase delay plate in the second part;

[0032] The phase retarder is used to emit the second part to the reflective sheet in the second polarization direction;

[0033] The reflective sheet is used to reflect the second part to the first beam adjusting component.

[0034] In some embodiments of the present application, the first beam adjustment component is used to reflect the first part to the projection lens in the first polarization direction, and transmit the second part to the phase delay plate in the second polarization direction;

[0035] The phase retarder is used to emit the second part to the reflective sheet in the second polarization direction;

[0036] The reflective sheet is used to reflect the second part to the first beam adjusting component.

[0037] In a second aspect, an embodiment of the present application further provides a laser projection device, including a laser light source, a beam adjustment component and a projection lens.

[0038] The laser light source is used to provide a light beam;

[0039] The beam adjustment component is located at the light-emitting side of the laser light source and is used to receive the light beam;

[0040] The projection lens is located at the light-emitting side of the beam adjustment component, and is used to receive the light beam and project it onto the imaging surface;

[0041] Wherein, the beam adjustment component comprises a first beam adjustment component and a second beam adjustment component;

[0042] The first beam adjustment component is located at the light output side of the laser light source, and is used to output the first part of the incident light in the first polarization direction, and output the second part of the incident light to the second beam adjustment component;

[0043] The second beam adjusting component is used to reflect the second part to the first beam adjusting component, and make the second part emerge in a second polarization direction; the light beam emerging from the first beam adjusting component includes at least a first polarization direction and a second polarization direction, and the two polarization directions are different;

[0044] The beam adjustment component is configured to emit the first part in the first polarization direction and emit the second part in the second polarization direction, so that the first part and the second part with different polarization directions are both emitted to the projection lens.

[0045] The laser projection device provided in the embodiment of the present application utilizes the characteristic that the first beam adjustment component has different transmission directions for the light beams with the same polarization direction, thereby changing the optical path of part of the light beam; and by adjusting the polarization direction of the light beam through the second beam adjustment component, the light beam incident on the projection lens can have different polarization directions, so as to reduce coherence and reduce speckle. Secondly, the laser projection device in the embodiment of the present application has a small number of components, which can simplify the structure of the optical path system and reduce the complexity of production and assembly on the one hand, and reduce the problem of optical path misalignment caused by component failure or position offset on the other hand, thereby improving the reliability and service life of the laser projection device system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0047] Figure 1 A first schematic diagram of a laser projection device provided in an embodiment of the present application;

[0048] Figure 2 A second schematic diagram of a laser projection device provided in an embodiment of the present application;

[0049] Figure 3 A third schematic diagram of a laser projection device provided in an embodiment of the present application;

[0050] Figure 4 A fourth schematic diagram of a laser projection device provided in an embodiment of the present application;

[0051] Figure 5 A fifth schematic diagram of a laser projection device provided in an embodiment of the present application;

[0052] Figure 6 A sixth schematic diagram of a laser projection device provided in an embodiment of the present application;

[0053] Figure 7 A seventh schematic diagram of a laser projection device provided in an embodiment of the present application;

[0054] Figure 8 A schematic diagram of a second light beam adjustment component of a laser projection device provided in an embodiment of the present application;

[0055] Fig. 9 An eighth schematic diagram of a laser projection device provided in an embodiment of the present application;

[0056] Fig.10This is a ninth schematic diagram of a laser projection device provided in an embodiment of the present application.

[0057] Description of reference numerals:

[0058] 10-Laser projection equipment;

[0059] 100-laser light source; 101-red light source; 102-green light source; 103-blue light source;

[0060] 200- beam adjustment assembly;

[0061] 210-first beam adjustment component;

[0062] 220-second beam adjustment component; 221-reflective sheet; 222-phase delay sheet;

[0063] 230-collimator lens group; 240-light homogenizer; 250-diffuser; 260-prism; 270-light valve;

[0064] 300-Projection lens. DETAILED DESCRIPTION

[0065] In related technologies, in order to achieve full-color display, the red, green and blue lasers emitted by the laser light source are usually output to the light modulation component in a time-sequential manner, and then projected to the projection lens to form an image after being modulated by the light modulation component, and then projected to the projection screen to form a projection image, that is, the same projection image is formed by the superposition of the three color images projected in time. Among them, the laser has a polarization direction, and the coherence of polarized light is strong, so interference occurs, resulting in strong speckle when projected onto certain projection screens.

[0066] However, some laser projection devices usually use multiple phase delay plates to change the polarization direction of polarized light. The optical path is long, resulting in a larger size of the laser projection device, and it is impossible to miniaturize the laser projection device without eliminating laser coherence.

[0067] In view of this, an embodiment of the present application provides a laser projection device, including a laser light source for providing a light beam; a light beam adjustment component, located on the light-emitting side of the laser light source, for receiving the light beam; a projection lens, located on the light-emitting side of the light beam adjustment component, for receiving the light beam and projecting it onto an imaging surface; wherein the light beam adjustment component has a first beam adjustment component and a second beam adjustment component; the first beam adjustment component is located on the light-emitting side of the laser light source, for emitting a first part of the incident light in a first polarization direction, and emitting a second part of the incident light to the second beam adjustment component; the second beam adjustment component is used to reflect the second part to the first beam adjustment component, and emit the second part in a second polarization direction; the light beam emitted through the first beam adjustment component includes at least a first polarization direction and a second polarization direction, and the two are different; the light beam adjustment component is configured to emit the first part in the first polarization direction, and emit the second part in the second polarization direction, so that the first part and the second part with different polarization directions are both emitted to the projection lens.

[0068] The laser projection device provided in the embodiment of the present application utilizes the characteristic that the first beam adjustment component has different transmission directions for the light beams with the same polarization direction, thereby changing the optical path of part of the light beam; and by adjusting the polarization direction of the light beam through the second beam adjustment component, the light beam incident on the projection lens can have different polarization directions, so as to reduce coherence and reduce speckle. Secondly, the laser projection device in the embodiment of the present application has a small number of components, which can simplify the structure of the optical path system and reduce the complexity of production and assembly on the one hand, and reduce the problem of optical path misalignment caused by component failure or position offset on the other hand, thereby improving the reliability and service life of the laser projection device system.

[0069] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0070] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and common meanings.

[0071] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0072] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0073] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0074] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0075] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0076] Figure 1 FIG. 1 is a schematic diagram of the structure of a laser projection device. Figure 1 As shown, after the upper shell of the laser projection device 10 is disassembled, the internal structure is divided according to the optical function, and may include a laser light source 100, an optical machine 20, and a projection lens 300.

[0077] Among them, the optical machine 20 may include light modulation components, such as phase modulation devices (Phaselight modulator, PLM) and amplitude modulation devices such as light rods and relay lenses. Among them, the phase modulation device plays a role in shaping and homogenizing the laser, and the amplitude light modulation component is the core component of the laser projection equipment. The amplitude light modulation component (also called light valve) can be divided into a transmissive liquid crystal display (Liquid Crystal Display, LCD), a liquid crystal on silicon (Liquid Crystal on Silicon, LCOS), and a digital micro mirror device (Digital Micro mirror Devices, DMD) chip. Among them, the DMD chip is used in the DLP projection architecture.

[0078] The laser light source 100 is used to provide a light source illumination beam. The laser light source 100 may include a laser of at least one color, such as a blue laser, or a dual-light laser, such as a blue laser and a red laser, or a three-color laser light source, including red (RED, R), green (Green, G), and blue (Blue, B) lasers, for providing a three-color laser illumination beam.

[0079] Take the laser light source as a three-color laser light source as an example. Usually, the laser of the three-color laser light source emits three colors of RGB in sequence, and irradiates the amplitude modulation device in sequence. Take the amplitude light modulation device as DMD as an example, consistent with the emission sequence of the three-color laser beam, the DMD receives three video image signals for the RGB three-color laser beam in sequence, flips the thousands of tiny reflectors on its surface at a positive angle or a negative angle corresponding to the video image signal, and reflects the laser beam irradiated on its surface into the projection lens 300, and then amplitude modulates the laser beam irradiated on the DMD accordingly to achieve projection imaging. That is to say, when the red laser beam is irradiated on the DMD, the DMD performs amplitude modulation on the red laser beam according to the video image signal for the red laser beam, and so on. In the above-mentioned laser projection process, although the three laser beams for a complete frame of the image are emitted sequentially, due to the fast sequential emission speed and the visual persistence characteristics of the human eye, the laser projection device can realize the display of the image to be projected.

[0080] Reference Figure 2-Figure 10 In some embodiments, the laser light source 100 includes a green light source 102 , a blue light source 103 and two red light sources 101 .

[0081] In some embodiments, the laser light source 100 is used to provide a light beam. It is understandable that the light beam can be P polarized light or S polarized light. The embodiment of the present application does not limit the polarization direction of the combined light, nor is it limited to the above example. The following description is taken as an example of the light beam being P polarized light.

[0082] Reference Figure 2-Figure 10 The laser projection device 10 includes a beam adjustment component 200, that is, the optical machine 20 includes a beam adjustment component 200, and the beam adjustment component 200 is located on the light output side of the laser light source 100 and is used to receive the light beam.

[0083] Reference Figure 3 , Figure 5 , Figure 7 , Fig.10 In some embodiments, the beam adjustment component 200 includes a light valve 270, which is used to receive and output the light beam, such as to modulate the light beam and allow the modulated light beam to be incident on the lens group of the projection lens 300 for imaging. On this basis, the light valve 270 can be a digital micromirror device (DMD); or, the light valve 270 can also be a liquid crystal on silicon (LCOS), both of which can be applied.

[0084] Reference Figure 4 , Figure 5 , Fig. 9 , Fig.10 In some embodiments, the beam adjustment assembly 200 further includes a collimating lens group 230 and a light homogenizer 240 .

[0085] The collimating lens group 230 is used to collimate the light beam into a parallel light beam, so as to reduce the loss of the light beam in the laser projection device 10, optimize the transmission of the light beam, and improve the optical efficiency; in addition, the collimated light beam can maintain a consistent direction and shape when passing through the optical system, ensuring the uniformity and clarity of the projected image.

[0086] The light homogenizer 240 is used to homogenize the light beam so that it forms a uniform light spot on the projection surface to avoid bright spots or dark spots. In addition, the light homogenizer 240 can also shape the light beam to meet specific shape requirements so as to better cooperate with other parts of the laser projection device 10.

[0087] It should be noted that the light homogenizer 240 can have various types. For example, the light homogenizer 240 can be a compound eye, a scattering plate, or a light pipe. The embodiment of the present application does not limit the specific form of the light homogenizer 240, nor is it limited to the above examples.

[0088] The following description will be made by taking the light homogenizing element 240 as a compound eye as an example.

[0089] The projection lens 300 is located at the light-emitting side of the beam adjustment assembly 200 and is used to receive the light beam and project it onto the imaging surface;

[0090] Exemplarily, the projection lens 300 may be an ultra-short-focus projection lens 300, which generally includes a refractor and a reflector for receiving the modulated light beam for imaging. The ultra-short-focus projection device can achieve a smaller projection ratio (the projection ratio is the ratio of the vertical distance from the center point of the light-emitting surface of the projection lens 300 to the plane where the projection surface is located to the width of the display area on the projection surface, where the width of the display area refers to the size of the display area in the horizontal direction), so the laser projection device 10 can be closer to the projection surface when projecting an image; or, the projection lens 300 may also be a telephoto projection lens 300, which is less difficult to design and has lower costs.

[0091] Reference Figure 2-Figure 10 Specifically, the beam adjustment component 200 includes a first beam adjustment component 210 and a second beam adjustment component 220 .

[0092] The first beam adjustment component 210 is located at the light output side of the laser light source 100, and is used to output the first part of the incident light in the first polarization direction, and output the second part of the incident light to the second beam adjustment component 220. The first beam adjustment component 210 can divide the incident light into two parts, one part maintains the original polarization direction, and the other part is guided to the second beam adjustment component 220.

[0093] Exemplarily, the first beam adjustment component 210 can split the beam of the same polarization direction, such as emitting a portion of P polarized light while emitting another portion of P polarized light to the second beam adjustment component 220. It should be noted that the first beam adjustment component 210 can emit a beam of a different polarization direction from the P polarized light to the second beam adjustment component 220.

[0094] The second beam adjusting component 220 is used to reflect the second part to the first beam adjusting component 210 and make the second part emerge in the second polarization direction, that is, the second beam adjusting component 220 can adjust the polarization direction of the second part while reflecting the second beam.

[0095] The beam adjustment component 200 is configured to emit the first part in a first polarization direction and emit the second part in a second polarization direction, so that the first part and the second part with different polarization directions are both emitted to the projection lens 300. In this way, it can be ensured that the light beam entering the projection lens includes light beams with different polarization directions.

[0096] It is understandable that, since the first polarization direction is different from the second direction, the coherence between the light beams in the two directions is low, which can reduce interference and further reduce the speckle of the laser projection device 10. In addition, in the embodiment of the present application, the laser projection device 10 has a small number of components, which can simplify the structure of the optical path system and reduce the complexity of production and assembly on the one hand, and reduce the optical path misalignment problem caused by component failure or position offset on the other hand, so as to improve the reliability and service life of the laser projection device 10.

[0097] As an optional implementation, the first polarization direction is perpendicular to the second polarization direction, which means that the first part and the second part form an angle of 90 degrees with each other in space.

[0098] Since the coherence between the vertically polarized light beams is relatively low, the spatial coherence of the light beams can be reduced or even eliminated, so as to further reduce the coherence and reduce the speckle phenomenon. In this way, the display effect of the laser projection device 10 can be improved.

[0099] Exemplarily, the incident light is P-polarized light, and the first beam adjustment component 210 can emit the first part of the P-polarized light, i.e., P1 light, and emit the second part of the P-polarized light, i.e., P2 light, to the second beam adjustment component 220. The second beam adjustment component 220 can change the polarization direction of the P2 light, such as S light, and reflect the S light to the first beam adjustment component 210. The first beam adjustment component 210 does not have an adjustment function for the S light, so the S light can be directly emitted through the first beam adjustment component 210. In this way, the first beam adjustment component 210 finally emits the P1 light and the S light. Since the optical path difference between the P1 light and the S light exceeds the spectral line width, the coherent waves cannot meet, so interference cannot occur.

[0100] In some embodiments, the proportion of the first part in the incident light is greater than or equal to a first proportion value, and the first proportion value can be 30%, 40%, 50%, 60%, 70%, 80%, 90%, etc. The embodiments of the present application do not limit the specific value of the first proportion value, nor are they limited to the above examples.

[0101] In some embodiments, the proportion of the first part in the incident light is less than or equal to a first proportion value, and the first proportion value can be 1%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, etc. The embodiment of the present application does not limit the specific value of the second proportion value, nor is it limited to the above examples.

[0102] By setting the ratio within the above range, the speckle phenomenon can be reduced and the uniformity and fineness of the image can be improved; in addition, the workload of the beam adjustment component 200 can be balanced, the wear and aging of the optical components can be reduced, and the stability and reliability of the system can be improved.

[0103] It should be noted that, in some embodiments, when the ratio of the P light to the S light received by the projection lens 300 is the same, the P light and the S light can further ensure that the coherent waves cannot meet, so interference cannot occur.

[0104] As an optional implementation, the first beam adjusting component 210 can form a transmission light path and a reflection light path. Therefore, there are different positional relationships between the first beam adjusting component 210 and the second beam adjusting component 220.

[0105] Reference Figure 2 , Figure 4 , Figure 6 , Fig. 9 In some embodiments, the first beam adjusting component 210 is used to reflect the first part to the projection lens 300 in the first polarization direction, and transmit the second part to the second beam adjusting component 220. At this time, the second beam adjusting component is located on the transmission light path of the first beam adjusting component 210, and is used to reflect the second part to the first beam adjusting component 210, and make the second part emerge in the second polarization direction.

[0106] At this time, the optical axis of the projection lens 300 intersects with the optical path of the beam adjustment assembly 200 , which is beneficial to miniaturization of the laser projection device 10 .

[0107] Exemplarily, the first beam adjustment component 210 can reflect the P1 light to the projection lens 300, and transmit the P2 light to the second beam adjustment component 220. The second beam adjustment component 220 can adjust the P2 light to the S light, and reflect the S light to the first beam adjustment component 210. However, the first beam adjustment component 210 does not have an adjustment function for the S light, so the S light can be directly transmitted to the projection lens 300 via the first beam adjustment component 210. In this way, the first beam adjustment component 210 finally emits the P1 light and the S light. Since the optical path difference between the P1 light and the S light exceeds the spectral line width, the coherent waves cannot meet, so interference cannot occur.

[0108] Reference Figure 3 , Figure 5 , Figure 7 , Fig.10 In some embodiments, the first beam adjusting component 210 is used to transmit the first part to the projection lens in the first polarization direction, and reflect the second part to the second beam adjusting component 220. At this time, the second beam adjusting component 220 is located on the reflection light path of the first beam adjusting component 210, and is used to reflect the second part to the first beam adjusting component 210, and make the second part emerge in the second polarization direction.

[0109] In this way, the projection lens 300 is located on the transmission light path of the first beam adjustment component 210. At this time, the optical axis of the projection lens 300 is coaxial with the optical path of the beam adjustment component 200, and modulation can be performed between the projection lens 300 and the beam adjustment component 200 through a reflector or a prism, so as to realize the miniaturization of the laser projection device 10.

[0110] Exemplarily, the first beam adjustment component 210 can transmit the P1 light to the projection lens 300, and reflect the P2 light to the second beam adjustment component 220. The second beam adjustment component 220 can adjust the P2 light to the S light, and reflect the S light to the first beam adjustment component 210. The first beam adjustment component 210 does not have an adjustment function for the S light, so the S light can be directly transmitted to the projection lens 300 via the first beam adjustment component 210. In this way, the first beam adjustment component 210 finally emits the P1 light and the S light. Since the optical path difference between the P1 light and the S light exceeds the spectral line width, the coherent waves cannot meet, so interference cannot occur.

[0111] Reference Figure 6-Figure 10 As an optional implementation, the second beam adjustment component 220 includes a reflective plate 221 and a phase delay plate 222 .

[0112] Specifically, the phase retarder 222 is located on the light incident side of the reflector 221. The phase retarder 222 is used to emit the second part to the reflector 221 in the second polarization direction, that is, to adjust the polarization direction of the second part of the light beam to the second polarization direction different from the first polarization direction. The reflector 221 is used to reflect the second part to the first beam adjustment component 210, that is, to reflect the second part of the light beam adjusted by the phase retarder 222 back to the first beam adjustment component 210.

[0113] The first beam adjusting component 210 does not have an adjustment function for the S light, so the S light can be directly transmitted to the projection lens 300 through the first beam adjusting component 210. In this way, the first beam adjusting component 210 finally emits the P1 light and the S light. Since the optical path difference between the P1 light and the S light exceeds the spectral line width, the coherent waves cannot meet, so interference cannot occur.

[0114] As an optional implementation, along the light emitting direction of the second beam adjusting component 220 , the projections of the reflective sheet 221 and the phase delay sheet 222 do not overlap.

[0115] Through the above arrangement, it is ensured that the light beams will not interfere with each other when passing through the phase delay plate 222 and the reflective plate 221, thereby ensuring the transmission quality of the light beams. In addition, this can optimize the optical path design and improve the efficiency and reliability of the system.

[0116] Reference Figure 6 , Figure 8, Fig. 9 As an optional embodiment, the first beam adjustment component 210 is used to transmit the first part to the projection lens in a first polarization direction, and reflect the second part to the phase delay plate 222; the phase delay plate 222 is used to emit the second part in a second polarization direction to the reflective plate 221; the reflective plate 221 is used to reflect the second part to the first beam adjustment component.

[0117] Exemplarily, the first beam adjustment component 210 can transmit the P1 light to the projection lens 300, and reflect the P2 light to the phase delay plate 222. The phase delay plate 222 can adjust the P2 light to the S light, and emit it to the reflective sheet 221. The reflective sheet 221 reflects the S light to the first beam adjustment component 210. However, the first beam adjustment component 210 does not have an adjustment function for the S light, so the S light can be directly transmitted to the projection lens 300 via the first beam adjustment component 210. In this way, the first beam adjustment component 210 finally emits the P1 light and the S light. Since the optical path difference between the P1 light and the S light exceeds the spectral line width, the coherent waves cannot meet, so interference cannot occur.

[0118] Reference Figure 7 , Fig.10 As an optional embodiment, the first beam adjustment component 210 is used to reflect the first part to the projection lens in a first polarization direction, and transmit the second part to the phase delay plate 222; the phase delay plate 222 is used to emit the second part in a second polarization direction to the reflective plate 221; the reflective plate 221 is used to reflect the second part to the first beam adjustment component.

[0119] Exemplarily, the first beam adjustment component 210 can reflect the P1 light to the projection lens 300, and transmit the P2 light to the phase delay plate 222. The phase delay plate 222 can adjust the P2 light to the S light, and emit it to the reflective sheet 221. The reflective sheet 221 reflects the S light to the first beam adjustment component 210. However, the first beam adjustment component 210 does not have an adjustment function for the S light, so the S light can be directly transmitted to the projection lens 300 via the first beam adjustment component 210. In this way, the first beam adjustment component 210 finally emits the P1 light and the S light. Since the optical path difference between the P1 light and the S light exceeds the spectral line width, the coherent waves cannot meet, so interference cannot occur.

[0120] Reference Figure 3 , Figure 5 , Figure 7 , Fig.10 In some embodiments, the beam adjustment assembly 200 further includes a diffuser 250 for diffusing light.

[0121] It should be noted that, in the beam adjustment assembly 200, except for the reflective sheet 221 and the phase delay sheet 222, other optical elements such as the collimating lens group 230, the light homogenizer 240 and the diffuser 250 can be set or removed as needed, and their positions can also be adjusted as needed, and the embodiments of the present application are not limited to this.

[0122] As an optional implementation, in Figure 6-Figure 8 In the embodiment, the beam adjustment component 200 may further include a prism 260, which is located on the transmission light path of the filter surface A, and the projection lens 300 is located on the transmission light path of the prism 260. In this way, the volume of the laser projection device 10 can be reduced, making it easier to miniaturize the laser projection device 10.

[0123] Reference Figure 1 and Figure 2 In a second aspect, an embodiment of the present application provides a laser projection device 10, including a laser light source 100, a beam adjustment component 200 and a projection lens 300. The laser light source 100 is used to provide a light beam. The beam adjustment component 200 is located at the light exit side of the laser light source 100 and is used to receive the light beam; the projection lens 300 is located at the light exit side of the beam adjustment component 200 and is used to receive the light beam and project it onto an imaging surface;

[0124] The first beam adjustment component 210 is located at the light output side of the laser light source 100, and is used to output the first part of the incident light in the first polarization direction, and output the second part of the incident light to the second beam adjustment component 220. The first beam adjustment component 210 can divide the incident light into two parts, one part maintains the original polarization direction, and the other part is guided to the second beam adjustment component 220.

[0125] Exemplarily, the first beam adjustment component 210 can split the beam of the same polarization direction, such as emitting a portion of P polarized light while emitting another portion of P polarized light to the second beam adjustment component 220. It should be noted that the first beam adjustment component 210 can emit a beam of a different polarization direction from the P polarized light to the second beam adjustment component 220.

[0126] The second beam adjusting component 220 is used to reflect the second part to the first beam adjusting component 210 and make the second part emerge in the second polarization direction, that is, the second beam adjusting component 220 can adjust the polarization direction of the second part while reflecting the second beam.

[0127] The beam adjustment component 200 is configured to emit the first part in a first polarization direction and emit the second part in a second polarization direction, so that the first part and the second part with different polarization directions are both emitted to the projection lens 300. In this way, it can be ensured that the light beam entering the projection lens includes light beams with different polarization directions.

[0128] It is understandable that, since the first polarization direction is different from the second direction, the coherence between the light beams in the two directions is low, which can reduce interference and further reduce the speckle of the laser projection device 10. In addition, in the embodiment of the present application, the laser projection device 10 has a small number of components, which can simplify the structure of the optical path system and reduce the complexity of production and assembly on the one hand, and reduce the optical path misalignment problem caused by component failure or position offset on the other hand, so as to improve the reliability and service life of the laser projection device 10.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 application.

[0130] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A laser projection device, characterized in that: include: A laser light source, for providing a light beam; A beam adjustment component, located at the light-emitting side of the laser light source, for receiving the light beam; A projection lens, located at the light-emitting side of the beam adjustment component, for receiving the light beam and projecting it onto an imaging surface; Wherein, the beam adjustment component includes a first beam adjustment component and a second beam adjustment component; The first beam adjustment component is located at the light output side of the laser light source, and is used to output the first part of the incident light in the first polarization direction, and output the second part of the incident light to the second beam adjustment component; The second beam adjusting component is used to reflect the second part to the first beam adjusting component, and make the second part emerge in a second polarization direction; the light beam emerging from the first beam adjusting component includes at least a first polarization direction and a second polarization direction, and the two polarization directions are different; The beam adjustment component is configured to emit the first part in the first polarization direction and emit the second part in the second polarization direction, so that the first part and the second part with different polarization directions are both emitted to the projection lens.

2. The laser projection device according to claim 1, characterized in that: The first polarization direction is perpendicular to the second polarization direction.

3. The laser projection device according to claim 1, characterized in that: The proportion of the first part in the incident light is greater than or equal to 30%; And / or, the proportion of the first part in the incident light is less than or equal to 70%.

4. The laser projection device according to any one of claims 1 to 3, characterized in that: The first beam adjusting component is used to reflect the first part to the projection lens in the first polarization direction, and transmit the second part to the second beam adjusting component; The second beam adjusting component is located on the transmission light path of the first beam adjusting component, and is used for reflecting the second part to the first beam adjusting component and making the second part emerge in the second polarization direction.

5. The laser projection device according to any one of claims 1 to 3, characterized in that: The first beam adjusting component is used to transmit the first part to the projection lens in the first polarization direction, and reflect the second part to the second beam adjusting component; The second beam adjusting component is located on the reflection light path of the first beam adjusting component, and is used for reflecting the second part to the first beam adjusting component and making the second part emerge in the second polarization direction.

6. The laser projection device according to any one of claims 1 to 3, characterized in that: The second light beam adjustment component comprises a reflector and a phase delay plate, wherein the phase delay plate is located at the light incident side of the reflector; The phase retarder is used to emit the second part to the reflective sheet in the second polarization direction; The reflective sheet is used to reflect the second part to the first beam adjusting component.

7. The laser projection device according to claim 6, characterized in that: Along the light emitting direction of the second light beam adjusting component, the projections of the reflective sheet and the phase delay sheet do not overlap.

8. The laser projection device according to claim 7, characterized in that: The first beam adjustment component is used to transmit the first part to the projection lens in the first polarization direction, and reflect the second part to the phase delay plate in the second part; The phase retarder is used to emit the second part to the reflective sheet in the second polarization direction; The reflective sheet is used to reflect the second part to the first beam adjusting component.

9. The laser projection device according to claim 7, characterized in that: The first beam adjustment component is used to reflect the first part to the projection lens in the first polarization direction, and transmit the second part to the phase delay plate in the second part; The phase retarder is used to emit the second part to the reflective sheet in the second polarization direction; The reflective sheet is used to reflect the second part to the first beam adjusting component.

10. A laser projection device, characterized in that: Including laser light source, beam adjustment components and projection lens, The laser light source is used to provide a light beam; The beam adjustment component is located at the light-emitting side of the laser light source and is used to receive the light beam; The projection lens is located at the light-emitting side of the beam adjustment component, and is used to receive the light beam and project it onto the imaging surface; Wherein, the beam adjustment component comprises a first beam adjustment component and a second beam adjustment component; The first beam adjustment component is located at the light output side of the laser light source, and is used to output the first part of the incident light in the first polarization direction, and output the second part of the incident light to the second beam adjustment component; The second beam adjusting component is used to reflect the second part to the first beam adjusting component, and make the second part emerge in a second polarization direction; the light beam emerging from the first beam adjusting component includes at least a first polarization direction and a second polarization direction, and the two polarization directions are different; The beam adjustment component is configured to emit the first part in the first polarization direction and emit the second part in the second polarization direction, so that the first part and the second part with different polarization directions are both emitted to the projection lens.

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