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 light source assembly used for providing a first light beam and a second light beam with different divergence angles, and the divergence angle of the first light beam is larger than that of the second light beam; a homogenizing assembly; a lens; the homogenizing assembly is provided with a first homogenizing area and a second homogenizing area, the diffusion angle of the first homogenizing area is smaller than that of the second homogenizing area, the first homogenizing area corresponds to and receives the first light beam, and the second homogenizing area corresponds to and receives the second light beam; the homogenizing assembly is configured to adjust the divergence angle of at least one of the first light beam and the second light beam so as to reduce the angle difference between the angle of the first light beam emitted to the lens and the angle of the second light beam emitted to the lens. Thus, the problem that the sizes of light spots are different due to the difference between the lasers of different colors is reduced, the uniformity and definition of a projected image can be remarkably improved, and the projection display effect is improved.

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, laser projection equipment that uses a three-color light source will have color aberration and easily produce speckle due to differences in the spectral distribution of the three colors of lasers. Utility Model Content

[0005] The embodiment of the present application provides a laser projection device, which can solve the technical problem that the laser projection device using a three-color light source in the related art has color difference in the projection picture due to the difference in the spectral distribution of the three colors of lasers, and is prone to produce speckle.

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

[0007] A light source assembly, configured to provide a first light beam and a second light beam having different divergence angles, wherein the divergence angle of the first light beam is greater than the divergence angle of the second light beam;

[0008] A homogenizing component, located at the light-emitting side of the light source component, and used for receiving the light beam;

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

[0010] The homogenizing component has a first homogenizing area and a second homogenizing area, the diffusion angle of the first homogenizing area is smaller than the diffusion angle of the second homogenizing area, the first homogenizing area corresponds to and receives the first light beam, and the second homogenizing area corresponds to and receives the second light beam;

[0011] The homogenization component is configured to adjust a divergence angle of at least one of the first light beam and the second light beam to reduce an angle difference between the first light beam and the second light beam directed toward the lens.

[0012] The laser projection device provided in the embodiment of the present application reduces the angle difference between the first light beam and the second light beam with different divergence angles when they are directed to the lens through a homogenizing component, thereby reducing the problem of different spot sizes caused by the difference between lasers of different colors. In this way, the uniformity and clarity of the projected image can be significantly improved, and the projection display effect can be improved. In addition, the chromatic aberration phenomenon can be effectively reduced to improve the color reproduction and consistency of the image. Secondly, the generation of useless light spots is avoided, and the optical efficiency of the laser projection device can be improved.

[0013] In some embodiments of the present application, the difference between the divergence angle of the first light beam and the divergence angle of the second light beam is set to w, the diffusion angle of the first homogenization area is set to b, and the diffusion angle of the second homogenization area is set to a, and the relationship between a, b, and w is: a=w+b.

[0014] This setting ensures that different light beams have the same divergence angle after adjustment, so that they are projected to the lens at the same angle.

[0015] In some embodiments of the present application, the value range of w is: w ≥ 1°, and / or, w ≤ 2°;

[0016] And / or, the value range of a is: a≥1°, and / or, a≤4°;

[0017] And / or, the value range of b is: b≥0°, and / or, b≤2°.

[0018] Such an arrangement can further ensure that different light beams have the same divergence angle after adjustment, so that the angles at which they are emitted to the lens are consistent.

[0019] In some embodiments of the present application, the angle difference between the first light beam and the second light beam directed toward the lens is 0°.

[0020] By setting it in this way, the first light beam and the second light beam with different divergence angles have the same angle when they are projected to the lens, and the spot sizes of lasers of different colors are the same, avoiding chromatic aberration and useless spots, so as to improve the projection display effect.

[0021] In some embodiments of the present application, the first light beam is a red light beam, and the second light beam includes at least one of a blue light beam and a green light beam; the homogenization component includes a first diffuser, and the first diffuser is located on the light path after the first light beam and the second light beam are combined; the first diffuser has the first homogenization area and the second homogenization area, and the first homogenization area is located on the periphery of the second homogenization area.

[0022] With this setting, the combined light beams can be adjusted at the same time to ensure that light beams of different colors have the same divergence angle when passing through the same optical element, thereby reducing the difference in spot size and improving the uniformity and clarity of the projected image.

[0023] In some embodiments of the present application, the homogenization assembly further includes a collimating lens group and a light homogenizer;

[0024] The collimator lens group is located at the light exit side of the light source assembly, the first diffuser is located at the light exit side of the collimator lens group, and the light homogenizer is located at the light exit side of the first diffuser and at the light entrance side of the lens.

[0025] With this arrangement, the first diffuser can diffuse the collimated light beam so that the divergence angle of the light beam is properly adjusted, ensuring that light beams of different colors have the same divergence angle when passing through the same optical element, reducing the difference in spot size and improving the uniformity and clarity of the projected image.

[0026] In some embodiments of the present application, the homogenization assembly further includes a collimating lens group and a light homogenizer;

[0027] The first diffuser is located at the light exiting side of the light source assembly, the collimator lens group is located at the light exiting side of the first diffuser, and the light homogenizer is located at the light exiting side of the collimator lens group and at the light incident side of the lens.

[0028] With such a configuration, the first diffuser can perform preliminary diffusion processing on the laser light beam emitted by the light source assembly to make the divergence angle of the light beam more uniform, which helps to reduce the unevenness of the light beam in the subsequent laser projection device, thereby improving the uniformity and clarity of the projected image.

[0029] In some embodiments of the present application, the homogenizing assembly includes a second diffuser, the second diffuser is located on the light emitting side of the light source assembly and on the light path before the first light beam and the second light beam are combined, and the second diffuser has the first homogenizing area and the second homogenizing area;

[0030] The first homogenization area is a transparent area.

[0031] In this way, by diffusing only the second light beam with a smaller divergence angle, the divergence angles of the first light beam and the second light beam at the lens can be made the same.

[0032] In some embodiments of the present application, the light source assembly includes a red light source, a blue light source and a green light source, the red light source is used to provide the first light beam, and the blue light source and the green light source are used together to provide the second light beam;

[0033] There are two second diffusers, each of which has the second homogenization region, and the two second diffusers are respectively located at the light emitting sides of the blue light source and the green light source.

[0034] In this way, the blue light beam and the green light beam are diffused respectively, making their divergence angle and brightness distribution more uniform, and making their divergence angles the same, thereby forming a light spot of uniform size and a more uniform second light beam after combining, which can improve the uniformity and clarity of the projected image.

[0035] In some embodiments of the present application, the homogenization assembly further includes a collimating lens group and a light homogenizer;

[0036] The second diffuser is located on the light exit side of the light source assembly, the collimator lens group is located on the light exit side of the second diffuser, and the light homogenizer is located on the light exit side of the collimator lens group and on the light entrance side of the lens.

[0037] Such an arrangement can effectively reduce the non-uniformity of the light beam, improve the transmission efficiency and imaging quality of the light beam, and thus significantly improve the projection display effect.

[0038] In a second aspect, an embodiment of the present application further provides a laser projection device, including a light source component, a homogenization component and a lens.

[0039] The light source assembly is used to provide a first light beam and a second light beam with different divergence angles, and the divergence angle of the first light beam is greater than the divergence angle of the second light beam; the homogenization assembly is located at the light exit side of the light source assembly, and is used to receive the light beam; the lens is located at the light exit side of the homogenization assembly, and is used to receive the light beam and project it onto the imaging surface;

[0040] The homogenizing component has a first homogenizing area and a second homogenizing area, the diffusion angle of the first homogenizing area is smaller than the diffusion angle of the second homogenizing area, the first homogenizing area corresponds to and receives the first light beam, and the second homogenizing area corresponds to and receives the second light beam;

[0041] The homogenization component is configured to adjust a divergence angle of at least one of the first light beam and the second light beam to reduce an angle difference between the first light beam and the second light beam directed toward the lens.

[0042] The laser projection device provided in the embodiment of the present application reduces the angle difference between the first light beam and the second light beam with different divergence angles when they are directed to the lens through a homogenizing component, thereby reducing the problem of different spot sizes caused by the difference between lasers of different colors. In this way, the uniformity and clarity of the projected image can be significantly improved, and the projection display effect can be improved. In addition, the chromatic aberration phenomenon can be effectively reduced to improve the color reproduction and consistency of the image. Secondly, the generation of useless light spots is avoided, and the optical efficiency of the laser projection device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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.

[0044] Figure 1 A first schematic diagram of a laser projection device provided in an embodiment of the present application;

[0045] Figure 2 A second schematic diagram of a laser projection device provided in an embodiment of the present application;

[0046] Figure 3 A third schematic diagram of a laser projection device provided in an embodiment of the present application;

[0047] Figure 4 A first schematic diagram of a first diffuser of a homogenizing assembly of a laser projection device provided in an embodiment of the present application;

[0048] Figure 5 A second schematic diagram of a first diffuser of a homogenizing assembly of a laser projection device provided in an embodiment of the present application;

[0049] Figure 6 A third schematic diagram of a laser projection device provided in an embodiment of the present application;

[0050] Figure 7 A first schematic diagram of a second diffuser of a homogenizing assembly of a laser projection device provided in an embodiment of the present application;

[0051] Figure 8 A fourth schematic diagram of a laser projection device provided in an embodiment of the present application;

[0052] Fig. 9 A second schematic diagram of a second diffuser of a homogenizing assembly of a laser projection device provided in an embodiment of the present application;

[0053] Fig.10A fifth schematic diagram of the laser projection device provided in an embodiment of the present application.

[0054] Description of reference numerals:

[0055] 10-Laser projection equipment;

[0056] 100-light source assembly; 101-red light source; 102-green light source; 103-blue light source;

[0057] 200-homogenizing component; 201-first homogenizing area; 202-second homogenizing area;

[0058] 210-collimating lens group; 220-light homogenizing element; 230-first diffuser; 240-second diffuser; 250-reflector;

[0059] 300-lens. DETAILED DESCRIPTION

[0060] In the related technology, the laser projection equipment is composed of a laser light source, an illumination system and a projection lens, wherein the illumination system has a light modulation component as its core component. Different types of light modulation components lead to different projection display technologies adopted in the projection equipment. Currently, the commonly used projection display technologies include liquid crystal display (Liquid Crystal Display, LCD) technology, digital light processing technology (Digital Light Processing, DLP) and silicon-based liquid crystal (Liquid Crystal On Silicon, LCOS) display technology. The corresponding light modulation components of the three are liquid crystal (LCD) light valve, digital micromirror device (Digital Micro Device, DMD) light valve and silicon-based liquid crystal (LCOS) light valve.

[0061] 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. After being modulated by the light modulation component, they are projected into the projection lens to form an image, and then projected onto 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.

[0062] However, since lasers of different colors have different focal lengths, when lasers of different focal lengths pass through the same optical element, light spots of different sizes will be formed. Therefore, light spots of different colors may appear at different positions on the projected image, resulting in poor projection display effect.

[0063] In view of this, an embodiment of the present application provides a laser projection device, including: a light source assembly, used to provide a first light beam and a second light beam with different divergence angles, the divergence angle of the first light beam is greater than the divergence angle of the second light beam; a homogenization assembly, located on the light exit side of the light source assembly, used to receive the light beam; a lens, located on the light exit side of the homogenization assembly, used to receive the light beam and project it onto an imaging surface; wherein the homogenization assembly has a first homogenization area and a second homogenization area, the diffusion angle of the first homogenization area is smaller than the diffusion angle of the second homogenization area, the first homogenization area corresponds to and receives the first light beam, and the second homogenization area corresponds to and receives the second light beam; the homogenization assembly is configured to adjust the divergence angle of at least one of the first light beam and the second light beam so as to reduce the angle difference between the first light beam and the second light beam when they are projected onto the lens.

[0064] The laser projection device provided in the embodiment of the present application reduces the angle difference between the first light beam and the second light beam with different divergence angles when they are directed to the lens through a homogenizing component, thereby reducing the problem of different spot sizes caused by the difference between lasers of different colors. In this way, the uniformity and clarity of the projected image can be significantly improved, and the projection display effect can be improved. In addition, the chromatic aberration phenomenon can be effectively reduced to improve the color reproduction and consistency of the image. Secondly, the generation of useless light spots is avoided, and the optical efficiency of the laser projection device can be improved.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Reference Figure 1 In a first aspect, an embodiment of the present application provides a laser projection device 10, comprising a light source assembly 100, a homogenization assembly 200 and a lens 300. The light source assembly 100 is used to emit a laser beam.

[0073] In some embodiments, the light source assembly 100 uses a monochromatic laser in conjunction with a color wheel for time-sharing display, which is relatively low in cost.

[0074] In some embodiments, the light source assembly 100 uses a three-color laser to perform a three-primary color display, can emit lasers of multiple colors, and has high brightness.

[0075] Reference Figure 1In the embodiment of the present application, the light source assembly 100 includes a plurality of light sources with different light emission wavelengths, that is, it may include a plurality of light sources with different light emission colors, such as a red light source 101, a green light source 102, and a blue light source 103. The light source assembly 100 adopts a three-color light source assembly for emitting a red light beam, a green light beam, and a blue light beam, that is, the red light source 101 emits a red light beam, the green light source 102 emits a green light beam, and the blue light source 103 emits a blue light beam. For example, the light source assembly 100 may adopt a small laser (Multi Chip LD, MCL for short) because it occupies a small space, which is conducive to the miniaturization of the light source assembly 100. MCL lasers have the advantages of long life, high brightness, and high power. In addition, the light source assembly 100 may also adopt a BANK laser, which is not limited here. Among them, light sources with different light emission wavelengths can emit light simultaneously or sequentially.

[0076] Reference Figure 1 In some embodiments, the light source assembly 100 includes a green light source 102, a blue light source 103, and two red light sources 101. It is understood that in order to ensure the light combination of multiple light sources, a reflective element may be provided on the light emitting side of each light source, and the light beams of each color may be combined after passing through the reflective element.

[0077] In some embodiments, the light source assembly 100 is used to provide a first light beam and a second light beam having different divergence angles, and the divergence angle of the first light beam is greater than the divergence angle of the second light beam.

[0078] It is understandable that lasers of different wavelengths will have different divergence angles under the same conditions (such as the same optical system and the same emission aperture). For a given beam waist radius, the longer the wavelength, the greater the divergence angle. Therefore, lasers of different wavelengths will have different divergence angles under the same conditions.

[0079] Therefore, when the light source assembly 100 emits a red light beam, a green light beam, and a blue light beam, since the wavelength of the red light beam is generally greater than the wavelength of the green light beam and the wavelength of the blue light beam, in the same laser projection device 10, the divergence angle of the red light beam is greater than the divergence angle of the green light beam, and the divergence angle of the red light beam is greater than the divergence angle of the blue light beam. That is, the first light beam is a red light beam.

[0080] It is understandable that the second light beam may refer to a blue light beam, a green light beam, or a combined light beam of a blue light beam and a green light beam. The present application embodiment does not limit this, nor is it limited to the above example.

[0081] Reference Figure 1 The homogenization component 200 is located at the light output side of the light source component 100 and is used to receive the light beam.

[0082] In some embodiments, the homogenization component 200 includes a filter, which can reduce stray light in the laser projection device 10, improve the contrast of the projected image, make the image clearer and more vivid, and prevent it from interfering with the quality of the projected image.

[0083] In some embodiments, the homogenization component 200 includes a light valve, which 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. On this basis, as another example, the light valve can be a digital micromirror device (DMD); or, the light valve can also be a liquid crystal on silicon (LCOS), both of which can be applied.

[0084] Reference Figure 1 , a lens 300 , located at the light-emitting side of the homogenizing component 200 , for receiving the light beam and projecting it onto the imaging surface;

[0085] Exemplarily, the lens 300 may be an ultra-short-throw projection lens, which generally includes a refractor and a reflector for receiving the modulated light beam for imaging. The ultra-short-throw projection device can achieve a smaller projection ratio (the projection ratio is the ratio of the vertical distance from the center point of the lens light-emitting surface 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 lens may be a telephoto lens, which is less difficult to design and has lower costs.

[0086] Reference Figure 2 , Figure 3 , Figure 6 , Figure 8 and Fig.10 In some embodiments, the size of the lens 300 is usually large. Therefore, in order to reduce the axial size of the laser projection device 10, the homogenization component 200 also includes a reflector 250, which is usually located on the light incident side of the lens 300 to reflect the light beam to the lens 300.

[0087] Reference Figure 2 Specifically, the homogenizing component 200 has a first homogenizing area 201 and a second homogenizing area 202, the diffusion angle of the first homogenizing area 201 is smaller than the diffusion angle of the second homogenizing area 202, the first homogenizing area 201 corresponds to and receives the first light beam, and the second homogenizing area 202 corresponds to and receives the second light beam; the homogenizing component 200 is configured to adjust the divergence angle of at least one of the first light beam and the second light beam so that the first light beam and the second light beam are projected to the lens 300 at the same angle.

[0088] Reference Figure 4 and Figure 5 It should be noted that the shapes of the first homogenizing area 201 and the second homogenizing area 202 may be the same or different; the shapes of the first homogenizing area 201 and the second homogenizing area 202 may be arbitrary, such as square, rectangle, circle, etc. The embodiment of the present application does not limit the specific shapes of the first homogenizing area 201 and the second homogenizing area 202 and whether the shapes are the same, nor is it limited to the above examples.

[0089] It can be understood that the first homogenization area 201 and the second homogenization area 202 may be related to the shape of the light source assembly 100 or the shape of the imaged image, and the embodiment of the present application is not limited to this.

[0090] The following description is made by taking the first homogenizing area 201 and the second homogenizing area 202 as rectangles. Figure 4 .

[0091] It can be understood that the divergence angle of the first light beam (such as red light) is relatively large, such as 5°, and a smaller angle of diffusion adjustment, such as 2°, is performed through the first homogenizing region 201. The divergence angle of the first light beam after passing through the first homogenizing region 201 is increased to 7°. The divergence angle of the second light beam (such as green light or blue light) is relatively small, such as 3°, and a larger angle of diffusion adjustment, such as 4°, is performed through the second homogenizing region 202. The divergence angle of the second light beam after passing through the second homogenizing region 202 is increased to 7°, that is, the divergence angles of the first laser beam and the second light beam after passing through the homogenizing component 200 are the same, and a light spot of the same size can be formed.

[0092] It should be noted that the above-mentioned specific divergence angles and diffusion adjustment angles are only examples, and the embodiments of the present application can be adjusted according to actual conditions.

[0093] The laser projection device 10 provided in the embodiment of the present application uses the homogenization component 200 to make the first light beam and the second light beam with different divergence angles to be projected to the lens 300 at the same angle, thereby reducing the problem of different spot sizes caused by the difference between lasers of different colors. In this way, the uniformity and clarity of the projected image can be significantly improved, and the projection display effect can be improved. In addition, the chromatic aberration phenomenon can be effectively reduced to improve the color reproduction and consistency of the image. Secondly, the generation of useless spots is avoided, and the optical efficiency of the laser projection device 10 can be improved.

[0094] As an optional implementation, the difference between the divergence angle of the first light beam and the divergence angle of the second light beam is set to w, the diffusion angle of the first homogenization area 201 is set to b, and the diffusion angle of the second homogenization area 202 is set to a, and the relationship between a, b, and w is: a=w+b. That is, the diffusion angle a of the second homogenization area 202 is equal to the difference w between the divergence angles of the first light beam and the second light beam plus the diffusion angle b of the first homogenization area 201.

[0095] Exemplarily, if the divergence angle of the first light beam is θ1, the divergence angle of the second light beam is θ2, and θ1>θ2. The difference in divergence angles is w, that is, w=θ1-θ2. The diffusion angle of the first homogenization region 201 to the first light beam is b, and the divergence angle of the first light beam after adjustment is θ1'=θ1-b. The diffusion angle of the second homogenization region 202 to the second light beam is a, and the divergence angle of the second light beam after adjustment is θ2'=θ2+a. In order to make the divergence angles of the first and second light beams the same after adjustment, that is, θ1'=θ2', then θ1-b=θ2+a. Substituting w=θ1-θ2, we can get wb=a. Therefore, a=w+b.

[0096] By setting the relationship between a, b, and w, it is ensured that light beams of different colors have the same divergence angle after adjustment, so that the angles at which they are directed to the lens 300 are consistent. In this way, the problem of different spot sizes caused by the difference between lasers of different colors can be effectively reduced, thereby significantly improving the uniformity and clarity of the projected image, improving the projection display effect, and effectively reducing the chromatic aberration phenomenon, and improving the color reproduction and consistency of the image.

[0097] In some embodiments, the value range of w can be greater than or equal to the first parameter value, and the first parameter value can be 1°, 1.2°, 1.3°, 1.5°, 1.8°, 1.9°, 2°, 5°, 10°, 50°, etc. The embodiments of the present application do not limit the first parameter value and are not limited to the above examples.

[0098] In some embodiments, the value range of w may also be less than or equal to the second parameter value, and the second parameter value may be 2°, 1.5°, 1°, 0.9°, 0.5°, 0.1°, etc. The embodiments of the present application do not limit the second parameter value and are not limited to the above examples.

[0099] It should be noted that if the value of w is too small, the spot sizes of the first light beam and the second light beam are close to the same, and there is no need to set an adjustment surface for adjustment; if the value of w is too large, the spot difference between the first light beam and the second light beam is too large, and imaging cannot be achieved in the same laser projection device 10.

[0100] In some embodiments, the value range of a can be greater than or equal to the third parameter value, and the third parameter value can be 1°, 1.2°, 1.3°, 1.5°, 1.8°, 1.9°, 2°, 3°, 4°, 5°, 10°, 50°, etc. The embodiments of the present application do not limit the third parameter value and are not limited to the above examples.

[0101] In some embodiments, the value range of a can be less than or equal to the fourth parameter value, and the fourth parameter value can be 4°, 3°, 2°, 1.5°, 1°, 0.9°, 0.5°, 0.1°, etc. The embodiments of the present application do not limit the fourth parameter value and are not limited to the above examples.

[0102] In some embodiments, the value range of b may be greater than or equal to the fifth parameter value, and the fifth parameter value may be 0°, 1°, 1.2°, 1.3°, 1.5°, 1.8°, 1.9°, 2°, 3°, 4°, 5°, 10°, 50°, etc. The fifth parameter value is not limited in the embodiment of the present application, nor is it limited to the above examples. For example, b≥0°, and / or b≤2°.

[0103] In some embodiments, the value range of b can be less than or equal to the sixth parameter value, and the sixth parameter value can be 2°, 1.5°, 1°, 0.9°, 0.5°, 0.1°, 0°, etc. The embodiments of the present application do not limit the sixth parameter value and are not limited to the above examples.

[0104] By setting the above range, the divergence angles of the adjusted first light beam and the second light beam can be made the same, thereby ensuring that the angles directed to the lens 300 are consistent, which can effectively reduce the problem of different spot sizes caused by the differences between lasers of different colors, improve the uniformity and clarity of the projected image, improve the projection display effect, and effectively reduce chromatic aberration, thereby improving the color reproduction and consistency of the image.

[0105] As an optional implementation, the angle difference between the first light beam and the second light beam directed to the lens 300 is 0°. That is, after passing through the homogenization component 200, the first light beam and the second light beam directed to the lens have the same angle. Through the above arrangement, the spot sizes of lasers of different colors can be made the same, thereby avoiding chromatic aberration and useless spots, and thus improving the display effect of the laser projection device 10.

[0106] Reference Figure 4As an optional embodiment, the first light beam is a red light beam, and the second light beam includes at least one of a blue light beam and a green light beam; the homogenization component 200 includes a first diffuser 230, and the first diffuser 230 is located on the light path after the first light beam and the second light beam are combined; the first diffuser 230 has a first homogenization area 201 and a second homogenization area 202, and the first homogenization area 201 is located on the periphery of the second homogenization area 202.

[0107] It can be understood that the divergence angle of the first light beam is relatively large, and a relatively large light spot can be formed. By arranging the first homogenizing region 201 with a relatively small diffusion angle around the second homogenizing region 202 with a relatively large diffusion angle, the second homogenizing region 202 diffuses the overlapping light spots between the first light beam and the second light beam at a relatively large angle, and the first homogenizing region 201 diffuses the non-overlapping light spots between the first light beam and the second light beam at a relatively small angle. In this way, the divergence angles of different light beams can be kept consistent after passing through the first diffusion sheet 230, that is, the size of the light spots can be kept consistent.

[0108] Reference Figure 4 and Figure 5 In combination with the above content, it can be seen that when the second homogenizing area 202 is rectangular, the first homogenizing area 201 is arranged outside the second homogenizing area 202, and at this time, the first homogenizing area 201 is a rectangular ring; when the second homogenizing area 202 is circular, the first homogenizing area 201 is arranged outside the second homogenizing area 202, and at this time, the first homogenizing area 201 is a circular ring.

[0109] By setting a diffuser on the optical path after the combined light, the combined light beam can be adjusted at the same time to ensure that light beams of different colors have the same divergence angle when passing through the same optical element, thereby reducing the difference in spot size and improving the uniformity and clarity of the projected image.

[0110] Reference Figure 2 and Figure 3 As an optional implementation, the homogenizing assembly 200 further includes a collimating lens group 210 and a light homogenizing element 220 .

[0111] The collimating lens group 210 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.

[0112] The light homogenizer 220 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 220 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.

[0113] It should be noted that the light homogenizer 220 can have various types. For example, the light homogenizer 220 can be a compound eye, a scattering plate, or a light guide, etc. The embodiment of the present application does not limit the specific form of the light homogenizer 220, nor is it limited to the above examples.

[0114] The following description will be made by taking the light homogenizing element 220 as a compound eye as an example.

[0115] Reference Figure 2 , wherein the collimating lens group 210 is located on the light emitting side of the light source assembly 100 , the first diffuser 230 is located on the light emitting side of the collimating lens group 210 , and the light homogenizer 220 is located on the light emitting side of the first diffuser 230 and on the light incident side of the lens 300 .

[0116] By setting the first diffuser 230 between the collimating lens group 210 and the light homogenizer 220, the first diffuser 230 can diffuse and adjust the collimated light beam so that the divergence angle of the light beam is properly adjusted, ensuring that light beams of different colors have the same divergence angle when passing through the same optical element, reducing the difference in spot size, and improving the uniformity and clarity of the projected image.

[0117] The light homogenizer 220 performs homogenization processing on the diffused light beam, so that the light beam forms a uniform light spot on the projection surface, avoiding the appearance of bright spots or dark spots, thereby improving the uniformity and overall quality of the projected image and enhancing the visual effect.

[0118] Reference Figure 3 As another optional embodiment, the first diffuser 230 is located on the light emitting side of the light source assembly 100, the collimating lens group 210 is located on the light emitting side of the first diffuser 230, and the light homogenizer 220 is located on the light emitting side of the collimating lens group 210 and on the light incident side of the lens 300.

[0119] By setting the first diffuser 230 between the light source assembly 100 and the collimating lens group 210, the first diffuser 230 can perform preliminary diffusion processing on the laser light beam emitted by the light source assembly 100 to make the divergence angle of the light beam more uniform. This helps to reduce the unevenness of the light beam in the subsequent laser projection device 10, thereby improving the uniformity and clarity of the projected image.

[0120] The collimator lens group 210 can perform collimation processing on the light beam to further improve the directionality and brightness of the light beam, thereby improving the transmission efficiency and imaging quality of the light beam. The light homogenizer 220 can further homogenize the light beam to make the light beam more uniform and consistent when projected onto the imaging surface, thereby improving the uniformity and clarity of the projected image.

[0121] Reference Figure 6 and Figure 7 As an optional embodiment, the homogenizing component 200 includes a second diffuser 240, which is located on the light emitting side of the light source component 100 and on the light path before the first light beam and the second light beam are combined. The second diffuser 240 has a first homogenizing area 201 and a second homogenizing area 202.

[0122] By setting a second diffuser 240 before the first light beam and the second light beam are combined, the light beams of different colors can be diffused separately so that each color light beam has a uniform divergence angle before combining, which helps to form a more uniform light beam after combining, thereby improving the uniformity and clarity of the projected image.

[0123] In some embodiments, the diffusion angle of the first homogenization region 201 is 0°, that is, the first homogenization region 201 does not perform diffusion processing on the light beam, and the light beam maintains its original directionality and divergence angle when passing through the first homogenization region 201 .

[0124] By setting the diffusion angle of the first homogenizing region 201 to 0°, it can be ensured that the first light beam (such as a red light beam) does not diffuse when passing through the first homogenizing region 201, thereby maintaining its original divergence angle. At this time, the second homogenizing region 202 has a certain diffusion angle, which can diffuse the second light beam (such as a green light beam or a blue light beam). Since the divergence angle of the first light beam is greater than the divergence angle of the second light beam, by only diffusing the second light beam with a smaller divergence angle, the divergence angles of the first light beam and the second light beam at the lens 300 can be made the same.

[0125] Assume that the divergence angle of the first light beam emitted by the light source assembly 100 is 5°, and the divergence angle of the second light beam is 3°. By setting the diffusion angle of the first homogenizing region 201 to 0°, it can be ensured that the first light beam maintains its divergence angle of 5° when passing through the first homogenizing region 201, and does not diffuse. At this time, the diffusion angle of the second homogenizing region 202 can be set to 2° to ensure that the second light beam is transformed into a divergence angle of 5° after passing through the second homogenizing region 202. In this way, the divergence angles of the first light beam and the second light beam can be kept consistent.

[0126] In some embodiments, the first homogenization region 201 is a transparent surface. The first homogenization region 201 is a transparent surface, that is, the adjustment surface will not perform any diffusion or adjustment processing on the light beam, and the light beam can pass through the transparent surface without hindrance.

[0127] It can be understood that the first homogenizing region 201 is a transparent surface, which is another form in which the diffusion angle of the first homogenizing region 201 is 0°, that is,

[0128] By setting the first homogenizing region 201 as a transparent surface, it can be ensured that the first light beam (such as the red light beam) does not change when passing through the first homogenizing region 201, thereby maintaining its original directionality and divergence angle. This helps to accurately control the characteristics of the light beam in the subsequent optical processing process and improve the uniformity and clarity of the projected image.

[0129] Reference Figure 8 and Fig. 9 When the first homogenizing region 201 is a transparent surface, it is equivalent to that the second diffuser is only located at the light emitting side of the green light source 102 and the blue light source 103 . At this time, the second diffuser 240 only includes two second homogenizing regions 202 .

[0130] As an optional embodiment, the light source assembly 100 includes a red light source 101, a blue light source 103 and a green light source 102, the red light source 101 is used to provide a first light beam, the blue light source 103 and the green light source 102 are jointly used to provide a second light beam, that is, the second light beam is a combination of the blue light beam and the green light beam.

[0131] Referring to 10 , at this time, in some embodiments, the number of the second diffusers 240 is two, the two second diffusers 240 both have the second homogenizing region 202, and the two second diffusers 240 are respectively located at the light emitting sides of the blue light source 103 and the green light source 102. At this time, the second diffuser 240 only includes one second homogenizing region 202.

[0132] By providing two second diffusion sheets 240, the blue light beam and the green light beam can be diffused respectively, so that the divergence angle and brightness distribution of each light beam are more uniform, thereby forming a more uniform second light beam after light combination, and improving the uniformity and clarity of the projected image. The blue light beam and the green light beam may have different divergence angles and brightness distributions before light combination.

[0133] By setting two second diffusers 240 and setting a second homogenization area 202 on each of the second diffusers 240, the blue light beam and the green light beam can be diffused separately to make their divergence angles and brightness distribution more uniform, and their divergence angles can be the same, thereby forming light spots of uniform size and a more uniform second light beam after light combination, which can improve the uniformity and clarity of the projected image.

[0134] As an optional embodiment, the second diffuser 240 is located on the light output side of the light source assembly 100 , the collimator lens group 210 is located on the light output side of the second diffuser 240 , and the light homogenizer 220 is located on the light output side of the collimator lens group 210 and on the light incident side of the lens 300 .

[0135] By arranging the second diffusion sheet 240 on the light-emitting side of the light source assembly 100 , the light beam can be initially diffused to make the divergence angle of the light beam more uniform, thereby providing a better basis for subsequent optical processing.

[0136] The collimator lens group 210 can perform collimation processing on the diffused light beam, so that the directionality and brightness of the light beam are further improved, thereby improving the transmission efficiency and imaging quality of the light beam. The light homogenizer 220 can further homogenize the collimated light beam, so that the light beam is more uniform and consistent when projected onto the imaging surface, thereby improving the uniformity and clarity of the projected image.

[0137] Through the above arrangement, the second diffuser 240 is used to perform preliminary diffusion processing on the light beam emitted by the light source assembly 100, the collimator lens group 210 is used to perform collimation processing on the light beam, and the light homogenizer 220 is used to perform further light homogenization processing on the light beam. Through the synergistic effect of these optical elements, the non-uniformity of the light beam can be effectively reduced, the transmission efficiency and imaging quality of the light beam can be improved, and the projection display effect can be significantly improved.

[0138] Reference Figure 1 In the second aspect, the embodiment of the present application further provides a laser projection device 10, including a light source assembly 100, a homogenization assembly 200 and a lens 300. The light source assembly 100 is used to provide a first light beam and a second light beam with different divergence angles, and the divergence angle of the first light beam is greater than the divergence angle of the second light beam; the homogenization assembly 200 is located on the light output side of the light source assembly 100, and is used to receive the light beam; the lens 300 is located on the light output side of the homogenization assembly 200, and is used to receive the light beam and project it onto the imaging surface.

[0139] The homogenizing component 200 has a first homogenizing region 201 and a second homogenizing region 202. The diffusion angle of the first homogenizing region 201 is smaller than the diffusion angle of the second homogenizing region 202. The first homogenizing region 201 corresponds to and receives the first light beam, and the second homogenizing region 202 corresponds to and receives the second light beam.

[0140] The homogenizing component 200 is configured to adjust a divergence angle of at least one of the first light beam and the second light beam so that the first light beam and the second light beam are emitted toward the lens 300 at the same angle.

[0141] It can be understood that the divergence angle of the first light beam (such as red light) is relatively large, such as 5°, and a smaller angle of diffusion adjustment, such as 2°, is performed through the first homogenizing region 201. The divergence angle of the first light beam after passing through the first homogenizing region 201 is increased to 7°. The divergence angle of the second light beam (such as green light or blue light) is relatively small, such as 3°, and a larger angle of diffusion adjustment, such as 4°, is performed through the second homogenizing region 202. The divergence angle of the second light beam after passing through the second homogenizing region 202 is increased to 7°, that is, the divergence angles of the first laser beam and the second light beam after passing through the homogenizing component 200 are the same, and a light spot of the same size can be formed.

[0142] It should be noted that the above-mentioned specific divergence angles and diffusion adjustment angles are only examples, and the embodiments of the present application can be adjusted according to actual conditions.

[0143] The laser projection device 10 provided in the embodiment of the present application uses the homogenization component 200 to make the first light beam and the second light beam with different divergence angles to be projected to the lens 300 at the same angle, thereby reducing the problem of different spot sizes caused by the difference between lasers of different colors. In this way, the uniformity and clarity of the projected image can be significantly improved, and the projection display effect can be improved. In addition, the chromatic aberration phenomenon can be effectively reduced to improve the color reproduction and consistency of the image. Secondly, the generation of useless spots is avoided, and the optical efficiency of the laser projection device 10 can be improved.

[0144] 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.

[0145] 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 assembly, configured to provide a first light beam and a second light beam having different divergence angles, wherein the divergence angle of the first light beam is greater than the divergence angle of the second light beam; A homogenizing component, located at the light-emitting side of the light source component, and used for receiving the light beam; A lens, located at the light-emitting side of the homogenizing component, for receiving the light beam and projecting it onto an imaging surface; The homogenizing component has a first homogenizing area and a second homogenizing area, the diffusion angle of the first homogenizing area is smaller than the diffusion angle of the second homogenizing area, the first homogenizing area corresponds to and receives at least part of the first light beam, and the second homogenizing area corresponds to and receives the second light beam; The homogenization component is configured to adjust a divergence angle of at least one of the first light beam and the second light beam to reduce an angle difference between the first light beam and the second light beam directed toward the lens.

2. The laser projection device according to claim 1, characterized in that: The difference between the divergence angle of the first light beam and the divergence angle of the second light beam is set to w, the diffusion angle of the first homogenization area is set to b, and the diffusion angle of the second homogenization area is set to a. The relationship among a, b, and w is: a=w+b.

3. The laser projection device according to claim 2, characterized in that: The value range of w is: w ≥ 1°, and / or, w ≤ 2°; And / or, the value range of a is: a ≥ 1°, and / or a ≤ 4°; And / or, the value range of b is: b≥0°, and / or, b≤2°.

4. The laser projection device according to any one of claims 1 to 3, characterized in that: The angle difference between the first light beam and the second light beam directed toward the lens is 0°.

5. The laser projection device according to any one of claims 1 to 3, characterized in that: The first light beam is a red light beam, and the second light beam includes at least one of a blue light beam and a green light beam; The homogenization component includes a first diffuser, and the first diffuser is located on the optical path after the first light beam and the second light beam are combined; The first diffusion sheet has the first homogenizing region and the second homogenizing region, and the first homogenizing region is located at the periphery of the second homogenizing region.

6. The laser projection device according to claim 5, characterized in that: The homogenizing assembly also includes a collimating lens group and a light homogenizing element; The collimator lens group is located on the light exit side of the light source assembly, the first diffuser is located on the light exit side of the collimator lens group, and the light homogenizer is located on the light exit side of the first diffuser and on the light entrance side of the lens; Alternatively, the first diffuser is located on the light exit side of the light source assembly, the collimator lens group is located on the light exit side of the first diffuser, and the light homogenizer is located on the light exit side of the collimator lens group and on the light entrance side of the lens.

7. The laser projection device according to any one of claims 1 to 3, characterized in that: The homogenizing assembly includes a second diffuser, the second diffuser is located on the light emitting side of the light source assembly and on the light path before the first light beam and the second light beam are combined, and the second diffuser has the first homogenizing area and the second homogenizing area; The first homogenization area is a transparent area.

8. The laser projection device according to claim 7, characterized in that: The light source assembly comprises a red light source, a blue light source and a green light source, the red light source is used to provide the first light beam, and the blue light source and the green light source are used together to provide the second light beam; There are two second diffusers, each of which has the second homogenization region, and the two second diffusers are respectively located at the light emitting sides of the blue light source and the green light source.

9. The laser projection device according to claim 7, characterized in that: The homogenizing assembly also includes a collimating lens group and a light homogenizing element; The second diffuser is located on the light exit side of the light source assembly, the collimator lens group is located on the light exit side of the second diffuser, and the light homogenizer is located on the light exit side of the collimator lens group and on the light entrance side of the lens.

10. A laser projection device, characterized in that: Including light source components, homogenization components and lenses, The light source assembly is used to provide a first light beam and a second light beam with different divergence angles, and the divergence angle of the first light beam is greater than the divergence angle of the second light beam; the homogenization assembly is located at the light exit side of the light source assembly, and is used to receive the light beam; the lens is located at the light exit side of the homogenization assembly, and is used to receive the light beam and project it onto the imaging surface; The homogenizing component has a first homogenizing area and a second homogenizing area, the diffusion angle of the first homogenizing area is smaller than the diffusion angle of the second homogenizing area, the first homogenizing area corresponds to and receives at least part of the first light beam, and the second homogenizing area corresponds to and receives the second light beam; The homogenization component is configured to adjust a divergence angle of at least one of the first light beam and the second light beam to reduce an angle difference between the first light beam and the second light beam directed toward the lens.

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