Laser projection equipment

Abstract

The embodiment of the utility model belongs to the laser projection technology, and provides laser projection equipment, the laser projection equipment comprises a light source system, an optical-mechanical system and a lens, the optical-mechanical system comprises a light valve, a half-wave plate and a light blocking assembly, and the light valve is used for receiving and guiding out a light beam; the half-wave plate is located on a transmission path of the light beam, is located between the light valve and the lens, and is used for changing the polarization direction of part of the light beam; the light blocking assembly is located on the transmission path of the light beam, located between the half-wave plate and the lens and located on at least one of the light emitting side of the lens and used for blocking the light beam guided out by the half-wave plate. The polarization directions of part of the light beams can be different, the light beams guided out by the half-wave plate are shielded, part of the light beams are prevented from being projected to an imaging surface, the laser projection equipment is prevented from generating stray light, and therefore the contrast ratio of the laser projection equipment is guaranteed.

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] With the continuous development of science and technology, laser projection equipment is increasingly used in people's work and life. At present, laser projection equipment mainly includes light source system, optical machine system and lens.

[0003] The optical machine system can emit an ON light beam and an OFF light beam, wherein the ON light beam is an imaging light beam and the OFF light beam is a non-imaging light beam. In order to prevent the non-imaging light beam from entering the lens, a structural plate is usually provided in the related art. The structural plate is made of opaque material and has color, and can be used to block the non-imaging light beam.

[0004] However, after being exposed to light for a long time, the structural parts are prone to discoloration and generate stray light, which will reduce the contrast of the projection image of the laser projection device. Utility Model Content

[0005] The embodiment of the present application provides a laser projection device, which can solve the technical problem that structural parts are easily discolored after being exposed to light for a long time, and stray light is generated, which will reduce the contrast of the projection picture of the laser projection device.

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

[0007] A light source system for providing a light beam;

[0008] An optical-mechanical system, located at the light-emitting side of the light source system, and used for receiving the light beam;

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

[0010] Wherein, the optical-mechanical system comprises:

[0011] A light valve, the light valve is used to receive and guide the light beam;

[0012] A half-wave plate, which is located on the transmission path of the light beam and between the light valve and the lens, and is used to change the polarization direction of part of the light beam;

[0013] A light blocking component is located on the transmission path of the light beam and is located between the half-wave plate and the lens and at least one of the light output sides of the lens, and is used to block the light beam derived from the half-wave plate.

[0014] The laser projection device of the embodiment of the present application is provided with an optical-mechanical system having a half-wave plate and a light-blocking component. The half-wave plate can change the polarization direction of part of the light beam so that the polarization direction of the part of the light beam is different from the polarization direction of the remaining light beam. The light-blocking component is located on the light beam path after the half-wave plate, and can block the light beam derived from the half-wave plate, that is, block the part of the light beam whose polarization direction has changed, to prevent the light beam from being projected onto the imaging surface, to prevent the laser projection device from generating stray light, thereby ensuring the contrast of the laser projection device; in addition, compared with the related art, the half-wave plate and the light-blocking component will not discolor, and have a longer service life. The user does not need to replace the discolored structural parts, and the yield rate can be guaranteed, thereby improving the yield rate of the laser projection device and improving the user experience.

[0015] In some embodiments of the present application, the light beam derived from the light valve includes a valid light beam and an invalid light beam, and the rotation angles of the valid light beam and the invalid light beam are different;

[0016] The half-wave plate is used to change the polarization direction of the invalid light beam so that the invalid light beam is S-polarized light.

[0017] With such a configuration, when the optical system includes a light-blocking component, the light-blocking component can block S-polarized light, prevent invalid light beams from being projected onto the imaging surface, and prevent the laser projection device from generating stray light, thereby ensuring the contrast of the laser projection device; in addition, compared with related technologies, the half-wave plate and the light-blocking component will not discolor and have a longer service life. Users do not need to replace discolored structural parts, thereby ensuring the yield rate, thereby improving the yield rate of the laser projection device and enhancing the user experience.

[0018] In some embodiments of the present application, the light blocking component includes a polarizer, which is located on the light output side of the lens and is used to filter S-polarized light.

[0019] With this configuration, the half-wave plate can be used in conjunction with the analyzer, and the half-wave plate can change the polarization direction of part of the light beam so that the invalid light beam is modulated into S-polarized light. The analyzer can block the S-polarized light from passing through, preventing the invalid light beam from being projected onto the imaging surface, and preventing the laser projection device from generating stray light, thereby ensuring the contrast of the laser projection device; in addition, compared with related technologies, the half-wave plate and the analyzer will not discolor, and have a longer service life. Users do not need to replace discolored structural parts, which can ensure the yield rate, thereby improving the yield rate of the laser projection device and improving the user experience.

[0020] In some embodiments of the present application, the light blocking component includes a reflective element, which is located between the half-wave plate and the lens, and is used to change the transmission direction of the S-polarized light to block the S-polarized light.

[0021] With such a configuration, the half-wave plate can be used in conjunction with the reflector, and the half-wave plate can change the polarization direction of part of the light beam so that the invalid light beam is modulated into S-polarized light. The reflector can reflect S-polarized light to prevent the invalid light beam from being projected onto the lens, and to prevent the laser projection device from generating stray light, thereby ensuring the contrast of the laser projection device; in addition, compared with related technologies, the half-wave plate and the reflector will not discolor, and have a longer service life. Users do not need to replace discolored structural parts, which can ensure the yield rate, thereby improving the yield rate of the laser projection device and improving the user experience.

[0022] In some embodiments of the present application, the light blocking component includes a polarizer and a reflector;

[0023] The polarizer is located at the light exiting side of the lens, and the polarizer is used to filter S polarized light;

[0024] The reflector is located between the half-wave plate and the lens, and is used to change the transmission direction of the S-polarized light to block the S-polarized light.

[0025] In this way, the half-wave plate can be used together with the analyzer and the reflector. The half-wave plate can change the polarization direction of the invalid light beam so that the invalid light beam is modulated into S-polarized light. The reflector can reflect S-polarized light to prevent the invalid light beam from being projected onto the lens; the analyzer can block the S-polarized light from passing through to prevent the invalid light beam from being projected onto the imaging surface, and prevent the laser projection device from generating stray light, thereby ensuring the contrast of the laser projection device; in addition, compared with related technologies, the half-wave plate, the analyzer and the reflector will not discolor, and have a longer service life. Users do not need to replace discolored structural parts, which can ensure the yield rate, thereby improving the yield rate of the laser projection device and improving the user experience.

[0026] In some embodiments of the present application, the lens includes a protective light-transmitting member, and along the transmission path of the light beam, the protective light-transmitting member is located on the outside of the analyzer and covers the analyzer.

[0027] With such arrangement, the protective light-transmitting member can protect the analyzer and prevent the external structure from contacting the analyzer, thereby ensuring the normal operation of the analyzer.

[0028] In some embodiments of the present application, the reflective element is a cover plate of the lens. Along the transmission path of the light beam, the surface roughness of the light-incoming side of the cover plate is greater than the surface roughness of the light-outgoing side. The cover plate is used to change the transmission direction of the S-polarized light to block the S-polarized light.

[0029] With such a configuration, by using the lens cover as a reflector for reflecting S-polarized light, the cover can simultaneously have the functions of protecting the lens and blocking S-polarized light, i.e., invalid light beams. There is no need to add additional reflectors with reflection functions, and the cost of the laser projection equipment is relatively low.

[0030] In some embodiments of the present application, a shell is further included, wherein the shell has a heat dissipation portion, and the reflector is used to change the transmission direction of the S-polarized light so that the S-polarized light is directed toward the heat dissipation portion.

[0031] Such a setting can prevent the reflector from collecting heat, and thus prevent the reflector from deforming due to heat accumulation, which is beneficial to ensure the long-term use of the reflector and can increase the service life of the reflector; it is beneficial to the dissipation of internal heat of the laser projection equipment, which can improve the heat dissipation efficiency of the laser projection equipment, reduce the probability of the laser projection equipment being affected by heat accumulation and affecting its normal operation, and is beneficial to ensure the long-term operation of the laser projection equipment.

[0032] In some embodiments of the present application, a prism assembly is further included, wherein the prism assembly is located between the light valve and the half-wave plate, and the prism assembly is used to receive the light beam derived from the light valve and guide the light beam to the lens;

[0033] The half-wave plate is located on the light-emitting side of the prism assembly and on the transmission path of a portion of the light beam.

[0034] With such a configuration, the invalid light beam can be modulated into S-polarized light, thereby facilitating the light blocking component to block the S-polarized light, preventing the invalid light beam from being projected onto the imaging surface, and preventing the laser projection device from generating stray light, thereby ensuring the contrast of the laser projection device.

[0035] In a second aspect, an embodiment of the present application provides a laser projection device, including:

[0036] A light source system for providing a light beam;

[0037] An optical-mechanical system, located at the light-emitting side of the light source system, and used for receiving the light beam;

[0038] A lens, located at the light-emitting side of the optical-mechanical system, for receiving the light beam and projecting it onto an imaging surface;

[0039] The optical-mechanical system includes a light valve, a lens, a half-wave plate and a light-blocking component.

[0040] The light valve is used to receive the light beam and guide it to the lens;

[0041] The lens is used to receive the light beam derived from the light valve and project it to form an imaging surface;

[0042] The half-wave plate is located on the transmission path of the light beam and between the light valve and the lens, and the half-wave plate is used to change the polarization direction of the corresponding part of the light beam;

[0043] The light blocking component is located on the transmission path of the light beam and is located between the half-wave plate and the lens and at least one of the light output sides of the lens, and is used to block the light beam derived from the half-wave plate.

[0044] The laser projection device of the embodiment of the present application is provided with an optical-mechanical system having a half-wave plate and a light-blocking component. The half-wave plate can change the polarization direction of part of the light beam so that the polarization direction of the part of the light beam is different from the polarization direction of the effective light. The light-blocking component is located on the light beam path after the half-wave plate, and can block the light beam derived from the half-wave plate, that is, block the part of the light beam whose polarization direction has changed, to prevent the part of the light beam from being projected onto the imaging surface, to prevent the laser projection device from generating stray light, thereby ensuring the contrast of the laser projection device; in addition, compared with the related art, the half-wave plate and the light-blocking component will not discolor, and have a longer service life. The user does not need to replace the discolored structural parts, and the yield rate can be guaranteed, thereby improving the yield rate of the laser projection device and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 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.

[0046] Figure 1-1 A schematic diagram of the structure of an optical-mechanical system of a laser projection device in the related art;

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

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

[0049] Figure 3 A schematic diagram of a second three-dimensional structure of a laser projection device provided in an embodiment of the present application;

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

[0051] Figure 5 A second front view structural schematic diagram of the laser projection device provided in an embodiment of the present application;

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

[0053] Figure 7 A schematic diagram of a third three-dimensional structure of a laser projection device provided in an embodiment of the present application;

[0054] Figure 8 A schematic diagram of a third top view structure of the laser projection device provided in an embodiment of the present application;

[0055] Fig. 9 This is a schematic diagram of the third front view structure of the laser projection device provided in an embodiment of the present application.

[0056] Description of reference numerals:

[0057] 11-illumination mirror assembly; 12-total reflection prism; 13-light valve; 14-light baffle; 15-projection lens;

[0058] 10-Laser projection equipment; A-Effective beam; B-Invalid beam; C-Transmission path;

[0059] 200-optical-mechanical system;

[0060] 210-light valve; 220-half-wave plate;

[0061] 230-light blocking component; 231-light blocking member; 232-polarizer; 233-reflecting member; 240-light guide tube;

[0062] 300-lens;

[0063] 310-protective light-transmitting member; 320-cover plate;

[0064] 400-housing;

[0065] 500-Prism assembly. DETAILED DESCRIPTION

[0066] Figure 1-1 The schematic diagram is a structural diagram of an optical-mechanical system of a laser projection device in the related art. The optical-mechanical system comprises an illumination lens group 11, a reverse total reflection prism 12, a light valve 13 and a light baffle 14.

[0067] After the light beam S1 is emitted from the lighting lens group 11, it passes through the reverse total reflection prism 12 and is incident on the light valve 13. The long side incident mode of the light valve 13 means that the longer side in the thickness direction of the light valve 13 receives the incident light. The imaging light beam S11 processed by the light valve 13 is incident on the reverse total reflection prism 12, and then emitted from the reverse total reflection prism 12 to the projection lens 15. The non-imaging light beam S12 processed by the light valve 13 is also emitted to the reverse total reflection prism 12, and then emitted from the reverse total reflection prism 12 to the optical machine lighting system. The light shielding plate 14 is arranged on the light exit side of the light valve 13 to shield the non-imaging light beam S12.

[0068] However, the structural plate is made of opaque material and has color. After being exposed to light for a long time, the structural member is easy to fade and generate stray light, which will reduce the contrast of the projection picture of the laser projection device.

[0069] In view of this, an embodiment of the present application provides a laser projection device, including: a light source system, an optomechanical system and a lens, the light source system is used to provide a light beam; the optomechanical system is located on the light output side of the light source system, and is used to receive the light beam; the lens is located on the light output side of the optomechanical system, and is used to receive the light beam and project it onto an imaging surface; wherein the optomechanical system includes: a light valve, a half-wave plate and a light blocking component, the light valve is used to receive the light beam and export it; the half-wave plate is located on the transmission path of the light beam and between the light valve and the lens, and the half-wave plate is used to change the polarization direction of part of the light beam; the light blocking component is located on the transmission path of the light beam and between the half-wave plate and the lens, and at least one of the light output sides of the lens, and is used to block the light beam exported by the half-wave plate.

[0070] The laser projection device of the embodiment of the present application is provided with an optical-mechanical system having a half-wave plate and a light-blocking component. The half-wave plate can change the polarization direction of part of the light beam so that the polarization direction of the part of the light beam is different from the polarization direction of the remaining light beam. The light-blocking component is located on the light beam path after the half-wave plate, and can block the light beam derived from the half-wave plate, that is, block the part of the light beam whose polarization direction has changed, to prevent the part of the light beam from being projected onto the imaging surface, to prevent the laser projection device from generating stray light, thereby ensuring the contrast of the laser projection device; in addition, compared with the related art, the half-wave plate and the light-blocking component will not discolor, and have a longer service life. The user does not need to replace the discolored structural parts, and the yield rate can be guaranteed, thereby improving the yield rate of the laser projection device and improving the user experience.

[0071] 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.

[0072] 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 common and usual meanings.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] Reference Figure 1-Figure 9 As shown, in the first aspect, an embodiment of the present application provides a laser projection device 10, including a light source system (not shown in the figure), an optical-mechanical system 200 and a lens 300.

[0079] Specifically, the light source system is used to provide a light beam. The light source system may include a light source, which may be a laser light source, for providing an illumination light beam. Exemplarily, the light source may be a three-color light source, including red, blue and green, to display a color image; or a monochromatic light source, which displays a color image through different colors of phosphors, filter wheels, etc.

[0080] The lens 300 is located on the light-emitting side of the optical system 200, and is used to receive the light beam and project it onto the imaging surface. Exemplarily, the lens 300 can be an ultra-short-focus projection lens, which usually includes a refractive lens group and a reflective lens group, and is used to receive the light beam modulated by the optical system 200 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 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), such as less than or equal to . Therefore, the laser projection device 10 can be closer to the projection surface when projecting an image; alternatively, the lens 300 can also be a telephoto lens 300, which is less difficult to design and has lower costs.

[0081] The optomechanical system 200 is located at the light output side of the light source system and is used to receive the light beam. The optomechanical system 200 includes a light valve 210 , a half-wave plate 220 and a light blocking component 230 .

[0082] Specifically, the light valve 210 is used to receive and export a light beam, such as to modulate the light beam, and allow the modulated light beam to be incident on a lens group of the lens 300 for imaging. On this basis, and exemplarily, the light valve 210 may be a digital micromirror device (DMD); or, the light valve 210 may also be a liquid crystal on silicon (LCOS), both of which may be applied.

[0083] The half-wave plate 220 is located on the transmission path C of the light beam and between the light valve 210 and the lens 300. The half-wave plate 220 is used to change the polarization direction of part of the light beam. It is understandable that the half-wave plate 220 is used to adjust the polarization direction of the light beam and can change different angles, such as rotating the polarization direction of the incident laser by 90 degrees. Exemplarily, P polarized light is modulated into S polarized light, or S polarized light is modulated into P polarized light.

[0084] The light blocking component 230 is located on the transmission path C of the light beam and is located between the half-wave plate 220 and the lens 300 and at least one of the light output sides of the lens 300 , and is used to block the light beam derived from the half-wave plate 220 .

[0085] It should be noted that the optomechanical system 200 may further include a light pipe 240 . The light pipe 240 is located between the light valve 210 and the light source system and is used to receive the light beam from the light source system and guide it to the light valve 210 .

[0086] It is understood that in some of these embodiments, reference Figure 3-Figure 6As shown, the light blocking component 230 can be located only between the half-wave plate 220 and the lens 300. After a part of the light beam is modulated by the half-wave plate 220, its polarization direction changes, and the light beam continues to pass through the light blocking component 230. The light blocking component 230 can block the light beam derived from the half-wave plate 220, and thus the light beam cannot reach the lens 300.

[0087] In other embodiments, reference Figure 1-Figure 2 As shown, the light blocking component 230 can be located only on the light output side of the lens 300. After a portion of the light beam is modulated by the half-wave plate 220, its polarization direction changes, and the light beam continues to pass through the light input side of the lens 300 and is projected out by the lens 300. The exported light beam is blocked by the light blocking component 230 and cannot reach the imaging surface.

[0088] In some other embodiments, reference Figure 7-Figure 9 As shown, the light blocking assembly 230 may include a plurality of light blocking members 231 .

[0089] It should be noted that the number of light blocking members 231 can be arbitrary. For example, the number of light blocking members 231 can be two, three, four, five, etc. The embodiment of the present application does not limit the specific number of light blocking members 231, nor is it limited to the above examples. The following description takes the number of light blocking members 231 as two as an example.

[0090] At this time, one of the light blocking members 231 can be located between the half-wave plate 220 and the lens 300, and the other light blocking member 231 can be located on the light output side of the lens 300. After a portion of the light beam is modulated by the half-wave plate 220, its polarization direction changes, and the light beam continues to pass through one of the light blocking members 231. The light blocking member 231 can block the light beam derived from the half-wave plate 220. The light beam continues to pass through the light input side of the lens 300 and is derived through the projection of the lens 300. The derived light beam is blocked by the other light blocking member 231 and cannot reach the imaging surface.

[0091] It is understandable that when there are multiple light blocking members 231 , the multiple light blocking members 231 may be the same or different. The embodiment of the present application does not limit whether the multiple light blocking members 231 are the same, nor is it limited to the above examples.

[0092] The laser projection device 10 of the embodiment of the present application is provided with an optical-mechanical system 200 having a half-wave plate 220 and a light-blocking component 230. The half-wave plate 220 can change the polarization direction of a part of the light beam so that the polarization direction of the part of the light beam is different from the polarization direction of the remaining light beams. The light-blocking component 230 is located on the light beam path after the half-wave plate 220, and can block the light beam derived from the half-wave plate 220, that is, block the part of the light beam whose polarization direction has changed, so as to prevent the part of the light beam from being projected onto the imaging surface, and prevent the laser projection device 10 from generating stray light, thereby ensuring the contrast of the laser projection device 10; in addition, compared with the related art, the half-wave plate 220 and the light-blocking component 230 will not discolor, and have a longer service life. The user does not need to replace the discolored structural parts, and the yield rate can be guaranteed, thereby improving the yield rate of the laser projection device 10 and improving the user experience.

[0093] Reference Figure 1-Figure 9 As shown, in some possible embodiments, the light beam derived by the light valve 210 includes an effective light beam A and an invalid light beam B. The effective light beam A and the invalid light beam B have different rotation angles. The effective light beam A is the light beam projected onto the imaging surface, and the invalid light beam B is the stray light on the peripheral side of the imaging surface. The half-wave plate 220 is used to change the polarization direction of the invalid light beam B so that the invalid light beam B is S-polarized light.

[0094] Through the above-mentioned settings, when the optical-mechanical system 200 includes a light-blocking component 230, the light-blocking component 230 can block S-polarized light, prevent the invalid light beam B from being projected onto the imaging surface, and prevent the laser projection device 10 from generating stray light, thereby ensuring the contrast of the laser projection device 10; in addition, compared with related technologies, the half-wave plate 220 and the light-blocking component 230 will not discolor, and have a longer service life. Users do not need to replace discolored structural parts, so the yield rate can be guaranteed, thereby improving the yield rate of the laser projection device 10 and improving the user experience.

[0095] Reference Figure 1-Figure 2 As shown, in some possible implementations, the light blocking component 230 includes an analyzer 232 , which is located at the light-emitting side of the lens 300 , and is used to filter S-polarized light.

[0096] It can be understood that the analyzer 232 has the function of detecting the polarization direction and filtering the P polarized light. That is, only the P polarized light can be emitted through the analyzer 232. After the invalid light beam B passes through the half-wave plate 220, the half-wave plate 220 can modulate the invalid light beam B into S polarized light, and the S polarized light cannot pass through the analyzer 232, that is, the analyzer 232 can block the invalid light beam B.

[0097] After the invalid light beam B is modulated by the half-wave plate 220, its polarization direction changes, that is, S-polarized light. The S-polarized light continues to pass through the light-incoming side of the lens 300 and is projected out through the lens 300. The exported light beam is blocked by the analyzer 232, and thus the invalid light beam B cannot reach the imaging surface.

[0098] It should be noted that, in order to ensure the light blocking function of the analyzer 232, along the transmission path C of the light beam, the analyzer 232 may correspond to at least the invalid light beam B. In some other embodiments, that is, the analyzer 232 may be located on the transmission path of the effective light beam A and the invalid light beam B. At this time, the effective light beam A is P polarized light, and the invalid light beam B passing through the half-wave plate 220 is S polarized light. The analyzer 232 may allow the P polarized light to pass through and block the S polarized light.

[0099] Through the above settings, the half-wave plate 220 can be used in conjunction with the analyzer 232, and the half-wave plate 220 can change the polarization direction of part of the light beam so that the invalid light beam B is modulated into S polarized light. The analyzer 232 can block the S polarized light from passing through, prevent the invalid light beam B from being projected onto the imaging surface, and prevent the laser projection device 10 from generating stray light, thereby ensuring the contrast of the laser projection device 10; in addition, compared with the related art, the half-wave plate 220 and the analyzer 232 will not discolor, and have a longer service life. The user does not need to replace the discolored structural parts, which can ensure the yield rate, thereby improving the yield rate of the laser projection device 10 and improving the user experience.

[0100] Reference Figure 3-Figure 6 As shown, in some possible implementations, the light blocking component 230 includes a reflector 233 , which is located between the half-wave plate 220 and the lens 300 , and is used to change the transmission direction of the invalid light beam B to block the S-polarized light.

[0101] It is understandable that the reflector 233 may be a reflector, a reflector plate, or other structures with a reflective function. The embodiment of the present application does not limit the specific form of the reflector 233, nor is it limited to the above examples.

[0102] It should be noted that in order to prevent the reflector 233 from reflecting the effective light beam A, on the transmission path C of the light beam, the reflector 233 should only correspond to the invalid light beam B to prevent the effective light beam A from being changed in transmission direction by the reflector 233 and affecting the display effect of the imaging surface.

[0103] Through the above-mentioned setting, the half-wave plate 220 can be used in conjunction with the reflector 233, and the half-wave plate 220 can change the polarization direction of the invalid light beam B so that the invalid light beam B is modulated into S polarized light. The reflector 233 can reflect S polarized light, prevent S polarized light from being projected onto the lens 300, and prevent the laser projection device 10 from generating stray light, thereby ensuring the contrast of the laser projection device 10; in addition, compared with the related art, the half-wave plate 220 and the reflector 233 will not discolor, and have a longer service life. The user does not need to replace the discolored structural parts, which can ensure the yield rate, thereby improving the yield rate of the laser projection device 10 and improving the user experience.

[0104] Reference Figure 6-Figure 9 As shown, in some possible embodiments, the light blocking component 230 includes a polarizer 232 and a reflector 233; the polarizer 232 is located on the light output side of the lens 300, and the polarizer 232 is used to filter S-polarized light; the reflector 233 is located between the half-wave plate 220 and the lens 300, and the reflector 233 is used to change the transmission direction of the S-polarized light to block the S-polarized light.

[0105] Through the above settings, the half-wave plate 220 can be used together with the polarizer 232 and the reflector 233. The half-wave plate 220 can change the polarization direction of the invalid light beam B so that the invalid light beam B is modulated into S polarized light. The reflector 233 can reflect S polarized light to prevent the invalid light beam B from being projected onto the lens 300; the polarizer 232 can block the S polarized light from passing through to prevent the invalid light beam B from being projected onto the imaging surface, and prevent the laser projection device 10 from generating stray light, thereby ensuring the contrast of the laser projection device 10; in addition, compared with the related art, the half-wave plate 220, the polarizer 232 and the reflector 233 will not discolor, and have a longer service life. The user does not need to replace the discolored structural parts, which can ensure the yield rate, thereby improving the yield rate of the laser projection device 10 and improving the user experience.

[0106] Reference Figure 1-Figure 2 , Figure 7-Figure 9 As shown, in some possible implementations, the lens 300 includes a protective light-transmitting member 310. Along the transmission path C of the light beam, the protective light-transmitting member 310 is located outside the analyzer 232 and covers the analyzer 232 to protect the analyzer 232. Exemplarily, the protective light-transmitting member 310 may be glass or other transparent structures.

[0107] It should be noted that the cross-sectional area of ​​the protective light-transmitting member 310 along the transmission path C perpendicular to the light beam can be greater than or equal to the cross-sectional area of ​​the polarizer 232 along the transmission path C perpendicular to the light beam. In this way, the protective light-transmitting member 310 can better cover the polarizer 232 to protect the polarizer 232 and avoid contact between external structures and the polarizer 232 to ensure the normal operation of the polarizer 232.

[0108] It is understandable that the shape of the protective light-transmitting member 310 can be adapted to the shape of the analyzer 232. For example, when the cross-sectional shape of the analyzer 232 is a square, the cross-sectional shape of the protective light-transmitting member 310 can also be a square; when the cross-sectional shape of the analyzer 232 is a rectangle, the cross-sectional shape of the protective light-transmitting member 310 can also be a rectangle, etc. The embodiment of the present application does not limit the specific shapes of the analyzer 232 and the protective light-transmitting member 310, nor is it limited to the above examples.

[0109] Through the above configuration, the protective light-transmitting member 310 can protect the analyzer 232 and prevent the external structure from contacting the analyzer 232 , so as to ensure the normal operation of the analyzer 232 .

[0110] Reference Figure 3-Figure 9 As shown, in some possible embodiments, the reflector 233 is a cover plate 320 of the lens 300. Along the transmission path C of the light beam, the surface roughness of the light incident side of the cover plate 320 is greater than the surface roughness of the light emitting side. The cover plate 320 is used to change the transmission direction of the S-polarized light to block the S-polarized light.

[0111] It can be understood that by using the cover plate 320 of the lens 300 as the reflector 233 for reflecting S-polarized light, the cover plate 320 can simultaneously have the function of protecting the lens 300 and blocking the S-polarized light, i.e., the invalid light beam B. There is no need to additionally add a reflector 233 with a reflection function, and the cost of the laser projection device 10 is relatively low.

[0112] It should be noted that in order to prevent the cover plate 320 from reflecting the effective light beam A, on the light beam transmission path C, the cover plate 320 should only correspond to the invalid light beam B to prevent the effective light beam A from being changed in transmission direction by the reflector 233 and affecting the display effect of the imaging surface.

[0113] Reference Figure 6 As shown, in some possible implementations, the laser projection device 10 further includes a housing 400 having a heat dissipation portion (not shown in the figure), and the reflector 233 is used to change the transmission direction of the S-polarized light so that the S-polarized light is directed toward the heat dissipation portion.

[0114] Through the above configuration, heat accumulation in the reflective element 233 can be avoided, thereby preventing the reflective element 233 from being deformed due to heat accumulation, which is beneficial to ensuring the long-term use of the reflective element 233 and can increase the service life of the reflective element 233.

[0115] In addition, by providing a reflective member 233 with a heat dissipation portion, the internal heat of the laser projection device 10 is facilitated to dissipate, the heat dissipation efficiency of the laser projection device 10 can be enhanced, and the probability of the laser projection device 10 being affected by heat accumulation and affecting normal operation is reduced, which is conducive to ensuring that the laser projection device 10 works for a long time.

[0116] It should be noted that when the reflector 233 is the cover plate 320 of the lens 300 , the cover plate 320 can be located on the light incident side of the lens 300 and on the transmission path C of the invalid light beam B to prevent the invalid light beam B, i.e., S-polarized light, from entering the lens 300 .

[0117] Reference Figure 1-Figure 9 As shown, in some possible implementations, a prism assembly 500 is also included. Exemplarily, the prism assembly 500 may include, for example, a total internal reflection (Total Internal Reflection, TIR) prism and a reverse total internal reflection (Reverse Total Internal Reflection, RTIR) mirror, for forming an illumination light path. The following description is taken as an example that the prism assembly 500 includes a TIR prism.

[0118] In an embodiment of the present application, the prism assembly 500, i.e., the TIR prism, is located between the light valve 210 and the half-wave plate 220. The prism assembly 500 is used to receive the light beam exported by the light valve 210 and export it to the lens 300; the half-wave plate 220 is located on the light output side of the prism assembly 500 and is located on the transmission path C of the invalid light beam B.

[0119] It should be noted that the half-wave plate 220 is located on the transmission path C of the invalid light beam B emitted by the prism assembly 500. It can be understood that when the light beam is emitted through the prism assembly 500, the invalid light beam B is located outside the effective light beam A, that is, the half-wave plate 220 can be located on one side of the edge of the prism assembly 500 to modulate the polarization direction of the invalid light beam B accordingly.

[0120] It can be understood that when the light blocking component 230 includes a reflective member 233, i.e., a cover plate 320, the cover plate 320 can be located on the side of the half-wave plate 220 away from the prism assembly 500, i.e., located on the outside of the half-wave plate 220, so as to reflect the S-polarized light modulated by the half-wave plate 220.

[0121] It should be noted that in order to ensure that the half-wave plate 220 can modulate the invalid light beam B more accurately, the user can increase the back focus of the lens 300, or increase the deflection angle of the light valve 210, or adjust the thickness of the TIR prism to increase the distance between the invalid light beam B and the effective light beam A, and then separate the effective light beam A and the invalid light beam B, so that the S-polarized light modulated by the half-wave plate 220 can be reflected by the reflector 233 and cannot enter the lens 300.

[0122] Through the above-mentioned arrangement, the light beam derived from the light valve can be injected into the lens and pass through the half-wave plate, so that the half-wave plate can modulate the invalid light beam into S-polarized light, thereby facilitating the light-blocking component to block the S-polarized light, thereby preventing the invalid light beam B from being projected onto the imaging surface and preventing the laser projection device from generating stray light, thereby ensuring the contrast of the laser projection device.

[0123] Reference Figure 1-Figure 9 As shown, in the second aspect, an embodiment of the present application provides a laser projection device 10, including a light source system, a lens 300 and an optical-mechanical system 200.

[0124] Specifically, the light source system is used to provide a light beam.

[0125] The lens 300 is located at the light-emitting side of the optical-mechanical system 200 and is used to receive the light beam and project it onto the imaging surface.

[0126] The optomechanical system 200 is located at the light output side of the light source system and is used to receive the light beam. The optomechanical system 200 includes a light valve 210 , a half-wave plate 220 and a light blocking component 230 .

[0127] Specifically, the light valve 210 is used to receive and guide 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 lens 300 for imaging.

[0128] The half-wave plate 220 is located on the transmission path C of the light beam and between the light valve 210 and the lens 300. The half-wave plate 220 is used to change the polarization direction of part of the light beam. It is understandable that the half-wave plate 220 is used to adjust the polarization direction of the light beam and can change different angles, such as rotating the polarization direction of the incident laser by 90 degrees. Exemplarily, P polarized light is modulated into S polarized light, or S polarized light is modulated into P polarized light.

[0129] The light blocking component 230 is located on the transmission path C of the light beam and is located between the half-wave plate 220 and the lens 300 and at least one of the light output sides of the lens 300 , and is used to block the light beam derived from the half-wave plate 220 .

[0130] It can be understood that, in some embodiments, the light blocking component 230 may be located only between the half-wave plate 220 and the lens 300. After a portion of the light beam is modulated by the half-wave plate 220, its polarization direction changes, and the light beam continues to pass through the light blocking component 230. The light blocking component 230 may block the light beam derived from the half-wave plate 220, and thus this portion of the light beam cannot reach the lens 300.

[0131] In other embodiments, the light blocking component 230 may be located only on the light output side of the lens 300. After a portion of the light beam is modulated by the half-wave plate 220, its polarization direction changes, and the light beam continues to pass through the light input side of the lens 300 and is exported through the projection of the lens 300. The exported light beam is blocked by the light blocking component 230, and thus this portion of the light beam cannot reach the imaging surface.

[0132] In some further embodiments, the light blocking assembly 230 may include a plurality of light blocking members 231 .

[0133] It should be noted that the number of light blocking members 231 can be arbitrary. For example, the number of light blocking members 231 can be two, three, four, five, etc. The embodiment of the present application does not limit the specific number of light blocking members 231, nor is it limited to the above examples. The following description takes the number of light blocking members 231 as two as an example.

[0134] At this time, one of the light blocking members 231 can be located between the half-wave plate 220 and the lens 300, and the other light blocking member 231 can be located on the light output side of the lens 300. After a portion of the light beam is modulated by the half-wave plate 220, its polarization direction changes, and the light beam continues to pass through one of the light blocking members 231. The light blocking member 231 can block the light beam derived from the half-wave plate 220. The light beam continues to pass through the light input side of the lens 300 and is derived through the projection of the lens 300. The derived light beam is blocked by the other light blocking member 231 and cannot reach the imaging surface.

[0135] It is understandable that when there are multiple light blocking members 231 , the multiple light blocking members 231 may be the same or different. The embodiment of the present application does not limit whether the multiple light blocking members 231 are the same, nor is it limited to the above examples.

[0136] The laser projection device 10 of the embodiment of the present application is provided with an optical-mechanical system 200 having a half-wave plate 220 and a light-blocking component 230. The half-wave plate 220 can change the polarization direction of a part of the light beam so that the polarization direction of the part of the light beam is different from the polarization direction of the remaining light beams. The light-blocking component 230 is located on the light beam path after the half-wave plate 220, and can block the light beam derived from the half-wave plate 220, that is, block the part of the light beam whose polarization direction has changed, so as to prevent the part of the light beam from being projected onto the imaging surface, and to prevent the laser projection device 10 from generating stray light, thereby ensuring the contrast of the laser projection device 10; in addition, compared with the related art, the half-wave plate 220 and the light-blocking component 230 will not discolor, and have a longer service life, and the user does not need to replace the discolored structural parts, which can ensure the yield rate, thereby improving the yield rate of the laser projection device 10 and improving the user experience.

[0137] 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.

[0138] 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 light source system for providing a light beam; An optical-mechanical system, located at the light-emitting side of the light source system, and used for receiving the light beam; A lens, located at the light-emitting side of the optical-mechanical system, for receiving the light beam and projecting it onto an imaging surface; Wherein, the optical-mechanical system comprises: A light valve, the light valve is used to receive and guide the light beam; A half-wave plate, which is located on the transmission path of the light beam and between the light valve and the lens, and is used to change the polarization direction of part of the light beam; A light blocking component is located on the transmission path of the light beam and is located between the half-wave plate and the lens and at least one of the light output sides of the lens, and is used to block the light beam derived from the half-wave plate.

2. The laser projection device according to claim 1, characterized in that: The light beam derived from the light valve includes an effective light beam and an invalid light beam, and the effective light beam and the invalid light beam have different rotation angles; The half-wave plate is used to change the polarization direction of the invalid light beam so that the invalid light beam is S-polarized light.

3. The laser projection device according to claim 2, characterized in that: The light blocking component comprises a polarizer, which is located at the light exiting side of the lens and is used for filtering S-polarized light.

4. The laser projection device according to claim 2, characterized in that: The light blocking component includes a reflective component, which is located between the half-wave plate and the lens, and is used to change the transmission direction of the S-polarized light to block the S-polarized light.

5. The laser projection device according to claim 2, characterized in that: The light blocking component includes a polarizer and a reflector; The polarizer is located at the light exiting side of the lens, and the polarizer is used to filter S polarized light; The reflector is located between the half-wave plate and the lens, and is used to change the transmission direction of the S-polarized light to block the S-polarized light.

6. The laser projection device according to claim 3 or 5, characterized in that: The lens comprises a protective light-transmitting member, and along the transmission path of the light beam, the protective light-transmitting member is located outside the polarizer and covers the polarizer.

7. The laser projection device according to claim 4 or 5, characterized in that: The reflector is a cover plate of the lens. Along the transmission path of the light beam, the surface roughness of the light-incoming side of the cover plate is smaller than the surface roughness of the light-outgoing side. The cover plate is used to change the transmission direction of the S-polarized light to block the S-polarized light.

8. The laser projection device according to claim 4 or 5, characterized in that: It also includes a shell having a heat dissipation portion, and the reflector is used to change the transmission direction of the S-polarized light so that the S-polarized light is directed toward the heat dissipation portion.

9. The laser projection device according to any one of claims 1 to 5, characterized in that: It also includes a prism assembly, the prism assembly is located between the light valve and the half-wave plate, and the prism assembly is used to receive the light beam derived from the light valve and guide it to the lens; The half-wave plate is located on the light-emitting side of the prism assembly and on the transmission path of a portion of the light beam.

10. A laser projection device, characterized in that: include: A light source system for providing a light beam; An optical-mechanical system, located at the light-emitting side of the light source system, and used for receiving the light beam; A lens, located at the light-emitting side of the optical-mechanical system, for receiving the light beam and projecting it onto an imaging surface; The optical-mechanical system includes a light valve, a lens, a half-wave plate and a light-blocking component. The light valve is used to receive and guide the light beam; The half-wave plate is located on the transmission path of the light beam and between the light valve and the lens, and the half-wave plate is used to change the polarization direction of part of the light beam; The light blocking component is located on the transmission path of the light beam and is located between the half-wave plate and the lens and at least one of the light emitting sides of the lens, and is used to block the light beam derived from the half-wave plate.

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