Projection equipment and projection system

Abstract

The utility model provides projection equipment and a projection system, and relates to the technical field of projection, and the projection equipment comprises a light-emitting assembly which comprises a plurality of first light-emitting parts, a plurality of second light-emitting parts and a plurality of third light-emitting parts; laser emitted by the first light-emitting part is used for forming a first light spot, and laser emitted by the second light-emitting part is used for forming a second light spot; the first light-emitting parts and the second light-emitting parts are asymmetrically arranged on the light-emitting assembly. The first homogenizing part is positioned on a light emitting path of the light emitting component and is used for homogenizing the laser; and the second homogenizing piece is positioned on the light emitting path of the first homogenizing piece and is used for homogenizing and shaping the laser, so that the laser with different wavelengths uniformly covers effective areas of more light valves. According to the projection equipment and the projection system provided by the invention, the speckle effect in the projection process can be reduced, and the color cast problem of the projection picture is relieved, so that the quality of the projection picture is ensured.

Description

Technical Field

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

[0002] Projection equipment is increasingly used in people's work and life. Due to the advantages of laser projection such as wide color gamut, high brightness, and small optical extension, lasers are generally used as projection light sources in projection equipment and are gradually replacing mercury lamp lighting.

[0003] Lasers are divided into red lasers, green lasers, and blue lasers according to the type of light emission, which emit red lasers, green lasers, and blue lasers respectively; after the three-color lasers are reflected by the light valve, they can form a projection image on the projection screen.

[0004] However, in the existing projection equipment, speckle effect will occur during the projection process, and there is a color cast problem, and the quality of the projected image is difficult to guarantee. Utility Model Content

[0005] In view of the above problems, the present application provides a projection device and a projection system, which can reduce the speckle effect during the projection process and alleviate the color cast problem of the projection picture, thereby ensuring the quality of the projection picture.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A first aspect of the present application provides a projection device, comprising:

[0008] A light-emitting component, the light-emitting component comprises a plurality of first light-emitting components, a second light-emitting component and a third light-emitting component, the three light-emitting components are respectively used to emit lasers of different wavelengths; the lasers emitted by the first light-emitting components are used to form a first light spot, and the lasers emitted by the second light-emitting components are used to form a second light spot; the plurality of first light-emitting components and the plurality of second light-emitting components are asymmetrically arranged on the light-emitting component;

[0009] A first homogenizing element, which is located on the light output path of the light emitting component and is used to homogenize the laser so that the geometric center distance between the first light spot and the second light spot emitted by the first homogenizing element is smaller than the geometric center distance between the first light spot and the second light spot incident on the first homogenizing element;

[0010] The second homogenizer is located on the light output path of the first homogenizer and is used to homogenize and shape the laser so that lasers of different wavelengths evenly cover more effective areas of the light valve.

[0011] In a possible implementation, the lasers emitted by the first light-emitting element, the second light-emitting element, and the third light-emitting element are green light, blue light, and red light, respectively.

[0012] In a possible implementation manner, the number of the first light-emitting elements and the second light-emitting elements is less than the number of the third light-emitting elements.

[0013] In a possible implementation manner, the plurality of third light-emitting elements are arranged in a row, and the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged in a row.

[0014] In a possible implementation, the first homogenizer and the second homogenizer are double-sided fly-eye lenses, and the optical axes of the first homogenizer and the second homogenizer coincide with each other; along a direction perpendicular to the optical axis of the second homogenizer, the cross section of the second homogenizer is circular;

[0015] Along the optical axis direction of the first homogenizer, both sides of the first homogenizer have a plurality of closely arranged first micro lenses; along the optical axis direction perpendicular to the first homogenizer, the cross section of the first micro lens is a regular polygon.

[0016] In a possible implementation, along the optical axis direction of the second homogenizer, both sides of the second homogenizer have a plurality of closely arranged second microlenses; along the optical axis direction perpendicular to the second homogenizer, the cross section of the second microlens is rectangular.

[0017] In a possible implementation, the projection device also includes a first relay lens, which is arranged between the first homogenizer and the second homogenizer, and the laser emitted through the first homogenizer is configured to pass through the first relay lens and the second homogenizer in sequence; the first relay lens is used to adjust the irradiation range of the laser.

[0018] In one possible implementation, the projection device also includes a beam splitting component, which is located between the light emitting component and the first homogenizer along the optical path of the laser; the beam splitting component is used to receive the laser emitted by the light emitting component to split the single laser beam into multiple beams, and direct the multiple laser beams toward the first homogenizer.

[0019] In a possible implementation, the beam splitting component includes a first beam splitting element and a second beam splitting element, and the first beam splitting element is located on the light output path of the light emitting component;

[0020] The first beam splitter is used to make the incident light partially reflected along the first direction to the first homogenizer and partially transmitted along the second direction to the second beam splitter; the second beam splitter is used to make the incident light partially transmitted along the second direction reflected along the first direction to the first homogenizer.

[0021] In a possible implementation, a plurality of beam splitting assemblies are provided, and a corresponding beam splitting assembly is provided on the light emitting path of each first light emitting element, second light emitting element, and third light emitting element;

[0022] The incident light reflected along the first direction by the first beam splitter in the beam splitter assembly corresponding to the first light emitting element and the second light emitting element is configured to be emitted toward the first homogenizing element after passing through the first beam splitter in the beam splitter assembly corresponding to the third light emitting element;

[0023] The incident light reflected along the first direction by the second beam splitter in the beam splitter assembly corresponding to the first light emitting element and the second light emitting element is configured to be emitted toward the first homogenizing element after passing through the second beam splitter in the beam splitter assembly corresponding to the third light emitting element.

[0024] In a possible implementation, the projection device further includes a diffuser, which is disposed between the light emitting component and the first homogenizer; the laser emitted by the light emitting component is configured to pass through the diffuser and the first homogenizer in sequence; and the diffuser is used to adjust the irradiation range of the laser.

[0025] In a possible implementation, the projection device further includes a second relay lens, which is disposed between the second homogenizer and the light valve; the laser emitted through the second homogenizer is configured to be emitted toward the light valve through the second relay lens.

[0026] A second aspect of the present application provides a projection device, comprising:

[0027] A light-emitting component, the light-emitting component is used to provide a plurality of first light-emitting components, a second light-emitting component and a third light-emitting component, the three light-emitting components are used to emit lasers with different wavelengths respectively; the lasers emitted by the first light-emitting components are used to form a first light spot, and the lasers emitted by the second light-emitting components are used to form a second light spot; the plurality of first light-emitting components and the plurality of second light-emitting components are configured to be asymmetrically arranged on the light-emitting component;

[0028] A first homogenizing element, which is used to be arranged on the light output path of the light emitting component and is used to homogenize the laser so that the geometric center distance between the first light spot and the second light spot emitted through the first homogenizing element is smaller than the geometric center distance between the first light spot and the second light spot emitted on the first homogenizing element;

[0029] The second homogenizer is used to be arranged on the light output path of the first homogenizer and to homogenize and shape the laser so that lasers of different wavelengths evenly cover more effective areas of the light valve.

[0030] A third aspect of the present application provides a projection system, comprising a projection screen and a projection device in any of the above implementations, wherein the projection device is used to project a projection picture onto the projection screen.

[0031] In the projection device provided by the present application, the laser is homogenized in turn by the first homogenizer and the second homogenizer, so that the distance between the geometric center of the first light spot and the geometric center of the second light spot is reduced, so that the lasers of different wavelengths are mixed more symmetrically and evenly, thereby alleviating the color cast problem of the projection picture and ensuring the quality of the projection picture; in addition, because the second homogenizer can shape the laser, so that the three lasers of different wavelengths evenly cover more effective areas of the light valve, thereby increasing the optical expansion of the three lasers, improving the speckle effect of the projection picture, and further ensuring the quality of the projection picture. In addition, the presence of the beam splitting component allows the optical expansion of lasers of different wavelengths to be closer to the optical expansion of the light valve, thereby further improving the speckle effect during the projection process and ensuring the quality of the projection picture.

[0032] The structure of the present application and its other inventive objectives and beneficial effects will be more clearly understood through the description of the specific implementation methods in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a light path diagram of a projection device in the related art;

[0035] Figure 2 It is a schematic diagram of irradiating red, green and blue lasers on a light valve in the related art;

[0036] Figure 3 A light path diagram of a projection device provided in an embodiment of the present application;

[0037] Figure 4 A light path diagram between the light emitting component and the beam splitting component provided in an embodiment of the present application;

[0038] Figure 5 This is a diagram showing the arrangement of lasers in a light-emitting assembly provided in an embodiment of the present application;

[0039] Figure 6 This is a schematic diagram of the illumination of red, green and blue lasers on the light valve in the embodiment of the present application;

[0040] Figure 7 A schematic diagram of the optical path of a single microlens of a double-sided fly-eye lens in an embodiment of the present application;

[0041] Figure 8 A schematic diagram of the optical paths of all micro-lenses of the double-sided fly-eye lens in the embodiment of the present application;

[0042] Fig. 9 A distribution diagram of the first microlenses on the first homogenizing element provided in an embodiment of the present application;

[0043] Fig.10 A distribution diagram of the second microlenses on the second homogenizing element provided in an embodiment of the present application;

[0044] Fig.11 This is a schematic diagram of irradiating the red, green and blue lasers on the second homogenizing element in an embodiment of the present application;

[0045] Fig.12 A schematic diagram of the projection device provided in an embodiment of the present application when projecting onto a projection screen.

[0046] Description of reference numerals:

[0047] 10-projection equipment; 100-light emitting component;

[0048] 110-third light emitting element; 120-first light emitting element;

[0049] 130-second light emitting element; 200-beam splitting assembly;

[0050] 210-first beam splitter; 220-second beam splitter;

[0051] 300-light homogenizing component; 310-first homogenizing element;

[0052] 311 - a first micro lens; 320 - a second homogenizing element;

[0053] 321 - a second micro lens; 330 - a first relay lens;

[0054] 400-light valve; 410-light emitting surface;

[0055] 500-Laser; 510-Red light;

[0056] 511-third light spot; 520-green light;

[0057] 521-first light spot; 530-blue light;

[0058] 531-second light spot; 600-diffuser;

[0059] 610-static diffuser; 620-dynamic diffuser;

[0060] 700-second relay lens; 800-lens;

[0061] 910-prism; 911-beam splitter;

[0062] 920-reflector; 930-optical lens;

[0063] 940-housing; 950-red laser;

[0064] 951-red light spot; 960-green laser;

[0065] 961-green light spot; 970-blue laser;

[0066] 971-blue light spot; 20-projection screen. DETAILED DESCRIPTION

[0067] Since laser projection has the advantages of wide color gamut, high brightness, and small optical extension, lasers are generally used as projection light sources in projection equipment and gradually replace mercury lamp lighting. Figure 1 As shown in the figure, a light path diagram of a projection device in the related art is shown, in which a red laser 950 can emit a red light 510, a green laser 960 can emit a green light 520, and a blue laser 970 can emit a blue light 530; after the red, green and blue lasers pass through a reflector 920 and an optical lens 930 in sequence, they can be emitted to a light-emitting surface 410 of a light valve 400, and the light-emitting surface 410 can reflect the laser 500, so that the laser 500 is emitted to a projection screen through a lens 800; as shown in FIG. Figure 2 As shown, when the red, green and blue lasers are irradiated on the light emitting surface 410 of the light valve 400 , a red light spot 951 , a green light spot 961 and a blue light spot 971 are formed respectively.

[0068] However, when the red, green and blue lasers are projected onto the light-emitting surface of the light valve, due to the differences in the expansion angles of the three-color lasers and the small optical expansion of the red, green and blue lasers, the optical expansion of the light valve cannot be filled, resulting in serious speckle problems during the projection process. In addition, there may also be color cast problems during the projection process, making it difficult to guarantee the quality of the projected image.

[0069] Based on the above problems, an embodiment of the present application provides a projection device and a projection system, wherein the projection system has a projection device, and the projection device includes a light-emitting component, a first homogenizer and a second homogenizer, wherein the light-emitting component includes a plurality of first light-emitting components, a second light-emitting component and a third light-emitting component, and the three light-emitting components are respectively used to emit lasers with different wavelengths; the laser emitted by the first light-emitting component is used to form a first light spot, and the laser emitted by the second light-emitting component is used to form a second light spot; the plurality of first light-emitting components and the plurality of second light-emitting components are asymmetrically arranged on the light-emitting component; in addition, the first homogenizer is located on the light-emitting path of the light-emitting component, and is used to homogenize the laser, so that the geometric center distance between the first light spot and the second light spot emitted by the first homogenizer is smaller than the geometric center distance between the first light spot and the second light spot incident on the first homogenizer; in addition, the second homogenizer is located on the light-emitting path of the first homogenizer, and is used to homogenize and shape the laser, so that lasers of different wavelengths evenly cover more effective areas of the light valve. Therefore, through the cooperation between the first homogenizing element and the second homogenizing element, the speckle effect in the projection process can be reduced, the color cast problem of the projection picture can be alleviated, and the quality of the projection picture can be guaranteed.

[0070] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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.

[0071] The following specific embodiments are used to describe in detail the technical solution of the present application and how the technical solution of the present application solves the above technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. Figures 3 to 12 , the structures of the projection device and the projection system provided in the embodiments of the present application are described in detail.

[0072] like Figures 3 to 5 As shown, the projection device 10 provided in the present application includes:

[0073] The light-emitting component 100 includes a plurality of first light-emitting components 120, a plurality of second light-emitting components 130 and a plurality of third light-emitting components 110, wherein the three light-emitting components are respectively used to emit lasers 500 with different wavelengths; the lasers 500 emitted by the first light-emitting components 120 are used to form a first light spot 521, the lasers 500 emitted by the second light-emitting components 130 are used to form a second light spot 531, and the lasers 500 emitted by the third light-emitting components 110 are used to form a third light spot 511. In addition, multiple first light-emitting members 120 and multiple second light-emitting members 130 are asymmetrically arranged on the light-emitting component 100; for example, the number of the first light-emitting members 120 and the second light-emitting members 130 is different, resulting in the multiple first light-emitting members 120 and the multiple second light-emitting members 130 being asymmetrically distributed on the light-emitting component 100; or, the number of the first light-emitting members 120 and the second light-emitting members 130 are the same, but the arrangement of the two is different, resulting in the multiple first light-emitting members 120 and the multiple second light-emitting members 130 being asymmetrically distributed on the light-emitting component 100; since the first light-emitting members 120 and the second light-emitting members 130 are asymmetrically arranged, the first light spot 521 and the second light spot 531 are also asymmetrically distributed, and there is a distance between the geometric center of the first light spot 521 and the geometric center of the second light spot 531, and the larger the distance is, the more serious the color cast problem of the projection image will be.

[0074] The first homogenizer 310 is located on the light output path of the light emitting component 100 and is used to homogenize the laser 500 so that the geometric center distance between the first light spot 521 and the second light spot 531 emitted by the first homogenizer 310 is smaller than the geometric center distance between the first light spot 521 and the second light spot 531 incident on the first homogenizer 310; thus, after homogenization by the first homogenizer 310, the distance between the geometric center of the first light spot 521 and the geometric center of the second light spot 531 is reduced, and the lasers 500 emitted by the first light emitting component 120 and the second light emitting component 130 are mixed more symmetrically and evenly, thereby alleviating the color cast problem of the projection picture.

[0075] The second homogenizer 320 is located on the light output path of the first homogenizer 310 and is used to homogenize and shape the laser 500 so that the lasers 500 of different wavelengths evenly cover more effective areas of the light valve 400. It should be noted that the second homogenizer 320 has the same homogenization function as the first homogenizer 310, and can further reduce the distance between the geometric center of the first light spot 521 and the geometric center of the second light spot 531, thereby further alleviating the color cast problem. In addition, the second homogenizer 320 can shape the laser 500 so that the shapes of the three light spots can adapt to the shape of the light valve 400, and the three lasers 500 of different wavelengths evenly cover more effective areas of the light valve 400, thereby improving the optical etendue of the laser 500, so that the optical etendue of the laser 500 is adapted to the optical etendue of the light valve 400, and then improve the speckle effect of the projection screen.

[0076] Therefore, in the projection device 10 provided by the present application, the laser 500 is homogenized in turn by the first homogenizer 310 and the second homogenizer 320, so that the distance between the geometric center of the first light spot 521 and the geometric center of the second light spot 531 is reduced, so that the lasers 500 of different wavelengths are mixed more symmetrically and evenly, thereby alleviating the color cast problem of the projection picture and ensuring the quality of the projection picture; in addition, because the second homogenizer 320 can shape the laser 500, the three lasers 500 of different wavelengths evenly cover more effective areas of the light valve 400, thereby increasing the optical extension of the three lasers 500, improving the speckle effect of the projection picture, and further ensuring the quality of the projection picture.

[0077] In addition, the first light-emitting element 120, the second light-emitting element 130 and the third light-emitting element 110 can also be asymmetrically distributed on the light-emitting component 100. During the process of homogenizing the laser 500 by the first homogenizer 310 and the second homogenizer 320, the distance between the geometric center of the third light spot 511 formed by the laser 500 emitted by the third light-emitting element 110 and the geometric centers of the first light spot 521 and the second light spot 531 can also be reduced; thus, the three different wavelengths of laser light 500 emitted by the first light-emitting element 120, the second light-emitting element 130 and the third light-emitting element 110 can also be mixed more symmetrically and evenly.

[0078] It should be noted that the light valve 400 may be a reflective light valve device, and thousands of tiny reflectors are provided on the light exit surface 410 of the light valve 400, and each tiny reflector can be driven individually for deflection; wherein, the light reflected at a positive deflection angle is called ON light (effective light), and the light reflected at a negative deflection angle is called OFF light (ineffective light); the OFF light is usually reflected onto the housing of the projection device 10 or the light absorbing device so that the OFF light is absorbed; and the ON light can pass through the prism 910 and then be emitted to the lens 800 and finally emitted to the outside of the projection device 10 for imaging. The effective area of ​​the light valve 400 refers to the area where the reflectors are provided on the light exit surface 410 of the light valve 400; in addition, the light valve 400 may also be a liquid crystal on silicon (LCOS) or LCD liquid crystal display chip.

[0079] It should be noted that the etendue is characterized by the product of the laser area and the divergence angle. In an actual optical system, the etendue will remain unchanged or be gradually enlarged. If the etendue decreases, it means that the efficiency of the system has been lost. As a core component in the projection, the light valve 400 has fixed size and angle requirements. Therefore, the etendue of the light valve 400 is used as a reference. When the etendue of the red, green and blue lasers is close to the etendue of the light valve 400, the entire projection system has a higher efficiency. At this time, the speckle phenomenon of the projection system is greatly reduced.

[0080] It should be noted that the first homogenizing element 310 and the second homogenizing element 320 together form the light homogenizing assembly 300. Figure 3 As shown, the prism 910 has a splitter surface 911 inside, and the prism 910 is located between the light homogenizing component 300 and the light valve 400, and also between the light valve 400 and the lens 800; the laser 500 emitted by the light homogenizing component 300 can be emitted to the light emitting surface 410 of the light valve 400 after being reflected by the splitter surface 911, and the ON light reflected by the light emitting surface 410 can pass through the splitter surface 911 and then be emitted to the lens 800.

[0081] Specifically, the first light-emitting element 120 can be a green chip, the second light-emitting element 130 can be a blue chip, and the third light-emitting element 110 can be a red chip; thus, the laser 500 emitted by the first light-emitting element 120 is green light 520, and the first light spot 521 is a green light spot; the laser 500 emitted by the second light-emitting element 130 is blue light 530, and the second light spot 531 is a blue light spot; the laser 500 emitted by the third light-emitting element 110 is red light 510, and the third light spot 511 formed by the laser 500 emitted by the third light-emitting element 110 is a red light spot.

[0082] In addition, the number of the first light-emitting elements 120 and the second light-emitting elements 130 may be less than the number of the third light-emitting elements 110; when the first light-emitting element 120 is a green chip, the second light-emitting element 130 is a blue chip, and the third light-emitting element 110 is a red chip, due to the requirements of color matching and power, it is generally necessary to make the number of red chips greater than the number of green chips and blue chips; specifically, Figure 5 As shown, the number of the third light emitting elements 110 is four, the number of the second light emitting elements 130 is two, and the number of the first light emitting elements 120 is three. In addition, the plurality of third light emitting elements 110 are arranged in a row, and the plurality of first light emitting elements 120 and the plurality of second light emitting elements 130 are arranged in a row. It should be noted that Figure 5 The arrangement of the laser 500 chips shown is for example only. In actual applications, the types of laser 500 chips included in the light-emitting component 100, the wavelength of the laser 500 emitted by each laser 500 chip, and the number and arrangement of each laser 500 chip are not limited.

[0083] In some embodiments, the first homogenizer 310 and the second homogenizer 320 may be double-sided fly-eye lenses, and the optical axes of the first homogenizer 310 and the second homogenizer 320 coincide with each other; the first homogenizer 310 and the second homogenizer 320 can homogenize the laser 500 in sequence, and the double-sided fly-eye lens has the advantage of good homogenization effect on the laser 500, such as Figure 7 and Figure 8 As shown in the figure, the working principle of the double-sided compound eye lens is demonstrated: along the optical axis direction of the double-sided compound eye lens, a microlens array is arranged on both sides of the double-sided compound eye lens, and the positions of the microlenses on both sides are arranged one by one and have the same curvature; thus, the laser 500 incident on each microlens can complete the illumination of the irradiated part once after being scaled by the relay lens, and n microlenses can illuminate the irradiated part n times, thereby greatly improving the uniformity of the laser 500 irradiated on the irradiated part; and, based on the principle of the double-sided compound eye lens, when the laser 500 irradiates the microlenses on the double-sided compound eye lens, the more microlenses are irradiated, the more times the laser 500 is homogenized. Therefore, the mutual cooperation of the two double-sided compound eye lenses can homogenize the laser 500 twice, ensuring the full mixing of the lasers 500 of different wavelengths, preventing the projection screen from having color cast, and thus ensuring the quality of the projection screen.

[0084] Specifically, Figures 9 to 11As shown, along the direction perpendicular to the optical axis of the second homogenizer 320, the cross section of the second homogenizer 320 may be circular; along the direction perpendicular to the optical axis of the first homogenizer 310, both sides of the first homogenizer 310 have a plurality of closely arranged first microlenses 311; along the direction perpendicular to the optical axis of the first homogenizer 310, the cross section of the first microlens 311 is a regular polygon. It should be noted that the double-sided fly-eye lens can not only homogenize the laser 500, but also shape the laser 500; for example, when the cross section of the first microlens 311 on the first homogenizer 310 is a regular polygon, the spot shape of the laser 500 projected on the second homogenizer 320 through the first microlens 311 is also a regular polygon. Thus, when the cross section of the first microlens 311 is a regular polygon, the spot shape of the laser 500 projected on the second homogenizer 320 through the first microlens 311 can be close to the circular cross-sectional shape of the second homogenizer 320, so that the spot of the laser 500 projected on the second homogenizer 320 can cover more microlenses on the second homogenizer 320 and improve the homogenization effect of the laser 500. It should be noted that the close-packed arrangement means that a plurality of microlenses are adjacent to a certain microlens and are arranged around the microlens, and there is no gap between the plurality of microlenses and the surrounded microlens.

[0085] Specifically, Fig. 9 As shown, considering the cost and processing capability, the cross section of the first microlens 311 can be a regular hexagon, so that the spot shape of the laser 500 passing through the first microlens 311 and projected onto the second homogenizer 320 is also a regular hexagon, as shown in FIG. Fig.10 As shown, the shapes of the first light spot 521, the second light spot 531, and the third light spot 511 are all regular hexagons. In addition, the cross section of the first microlens 311 can be a regular polygon with other numbers of sides, such as a regular quadrilateral, a regular pentagon, and a regular octagon. It should be noted that the more sides the regular polygon has, the closer the shape of the light spot projected by the laser 500 through the first microlens 311 on the second homogenizer 320 is to a circle, so that more microlenses on the second homogenizer 320 can be covered to enhance the homogenization effect of the laser 500.

[0086] Specifically, along the optical axis direction of the second homogenizer 320, both sides of the second homogenizer 320 have a plurality of closely arranged second micro lenses 321; along the optical axis direction perpendicular to the second homogenizer 320, the cross section of the second micro lenses 321 is rectangular. When the laser light 500 passes through the first micro lens 311 and is projected onto the second homogenizer 320, the laser light 500 can pass through the second micro lens 321 and be projected onto the light exit surface 410 of the light valve 400; Figure 6As shown, since the cross-section of the second microlens 321 is rectangular, the shape of the light spot projected by the laser 500 on the light emitting surface 410 is also rectangular. The shape of the rectangular light spot can adapt to the shape of the rectangular light emitting surface 410, so that the laser 500 can illuminate more effective areas on the light emitting surface 410.

[0087] For example, Figure 3 As shown, the projection device 10 may further include a first relay lens 330, which is disposed between the first homogenizer 310 and the second homogenizer 320. The laser 500 emitted from the first homogenizer 310 is configured to pass through the first relay lens 330 and the second homogenizer 320 in sequence; the first relay lens 330 is used to adjust the irradiation range of the laser 500. In this configuration, the presence of the first relay lens 330 can adjust the irradiation range of the laser 500, so that the laser 500 can irradiate a larger number of microlenses on the second homogenizer 320, thereby improving the homogenization effect of the laser 500. Specifically, the first relay lens 330 may be composed of two convex lenses.

[0088] In some embodiments, Figure 3 As shown, the projection device 10 may further include a beam splitter assembly 200, which is located between the light emitting assembly 100 and the first homogenizing element 310 along the optical path of the laser 500; the beam splitter assembly 200 is used to receive the laser 500 emitted by the light emitting assembly 100, so as to split the single laser beam 500 into multiple beams, and make the multiple laser beams 500 project toward the first homogenizing element 310. For example, when a beam of red light 510 projects toward the beam splitter assembly 200, the beam splitter assembly 200 can split the beam of red light 510 into two or more beams; thus, since the angles of the red, green and blue laser beams remain unchanged, when the beam splitter assembly 200 splits the beam of laser beam 500 into two or more beams, the overall optical extension amount of the laser beam 500 increases by at least one time; thus, the optical extension amount of the red, green and blue laser beams can be closer to the optical extension amount of the light valve 400, so as to further reduce the speckle effect during the projection process and ensure the quality of the projection picture.

[0089] It should be noted that compared with Figure 2 Schematic diagram of irradiation of related technologies, Figure 2 The optical etendue of the red, green and blue lasers in the light valve 400 is small, and the red light spot 951, the green light spot 961 and the blue light spot 971 can only occupy a small area of ​​the light exit surface 410 on the light valve 400; and the present application uses the beam splitter component 200 to increase the optical etendue of the laser 500, such as Figure 6As shown, the area occupied by the light spot on the light exit surface 410 is enlarged, so that the optical expansion amount of the red, green and blue lasers can be closer to the optical expansion amount of the light valve 400, and the speckle contrast of the red, green and blue lasers can be optimized, thereby improving the speckle problem; in addition, since the beam splitting component 200 increases the overall optical expansion amount of the laser 500, the size of the laser spot irradiated on the double-sided fly-eye lens is increased, so that the laser 500 can irradiate a larger number of microlenses, so that the laser 500 is further homogenized.

[0090] Specifically, Figure 4 As shown, the beam splitter assembly 200 may include a first beam splitter 210 and a second beam splitter 220. The first beam splitter 210 is located on the light output path of the light emitting assembly 100. The first beam splitter 210 is used to make the incident light partially reflected along the first direction to the first homogenizing element 310, and partially transmitted along the second direction to the second beam splitter 220. The second beam splitter 220 is used to make the incident light partially transmitted along the second direction reflected along the first direction to the first homogenizing element 310. Through the mutual cooperation of the first beam splitter 210 and the second beam splitter 220, the beam splitter assembly 200 can split a laser beam 500 into two beams, and make the two laser beams 500 emitted to the first homogenizing element 310 together. Specifically, the first beam splitter 210 can split the laser beam 500 into two equal parts. The first beam splitter 210 can be a semi-transmissive and semi-reflective lens, and the second beam splitter 220 can be a total reflection lens. The first direction and the second direction can be perpendicular to each other.

[0091] In addition, if Figure 4 As shown, a plurality of beam splitting assemblies 200 may be provided, and a corresponding beam splitting assembly 200 is provided on the light emitting path of each first light emitting element 120, second light emitting element 130 and third light emitting element 110. When the third light emitting element 110 emits red light 510, the beam splitting assembly 200 corresponding to the third light emitting element 110 can split a beam of red light 510 into two beams of red light 510, thereby improving the optical extension of the red light 510; when the first light emitting element 120 emits green light 520, the beam splitting assembly 200 corresponding to the first light emitting element 120 can split a beam of green light 520 into two beams of green light 520, thereby improving the optical extension of the green light 520; when the second light emitting element 130 emits blue light 530, the beam splitting assembly 200 corresponding to the second light emitting element 130 can split a beam of blue light 530 into two beams of blue light 530, thereby improving the optical extension of the blue light 530.

[0092] Further, such as Figure 4As shown, the incident light reflected along the first direction by the first beam splitter 210 in the beam splitter assembly 200 corresponding to the first light emitting element 120 and the second light emitting element 130 is configured to be emitted to the first homogenizing element 310 after passing through the first beam splitter 210 in the beam splitter assembly 200 corresponding to the third light emitting element 110; the incident light reflected along the first direction by the second beam splitter 220 in the beam splitter assembly 200 corresponding to the first light emitting element 120 and the second light emitting element 130 is configured to be emitted to the first homogenizing element 310 after passing through the second beam splitter 220 in the beam splitter assembly 200 corresponding to the third light emitting element 110. Specifically, the first beam splitter 210 in the beam splitter assembly 200 corresponding to the third light emitting element 110 can play the role of semi-transmitting and semi-reflecting the red light 510, and can also play the role of transmitting the green light 520 and the blue light 530, so that the green light 520, the blue light 530, and the red light 510 can be emitted to the first homogenizing element 310 together. Specifically, the second beam splitter 220 in the beam splitter assembly 200 corresponding to the third light-emitting element 110 can reflect the red light 510 and transmit the green light 520 and the blue light 530 , thereby facilitating the green light 520 , the blue light 530 , and the red light 510 to be emitted toward the first homogenizing element 310 together.

[0093] In some embodiments, the projection device 10 may further include a diffuser 600, which is disposed between the light emitting assembly 100 and the first homogenizing member 310; the laser light 500 emitted by the light emitting assembly 100 is configured to pass through the diffuser 600 and the first homogenizing member 310 in sequence; the diffuser 600 is used to adjust the irradiation range of the laser light 500. Specifically, the diffuser 600 includes a static diffuser 610 and a dynamic diffuser 620, and the laser light 500 emitted by the light emitting assembly 100 passes through the static diffuser 610 and the dynamic diffuser 620 in sequence and is emitted to the first homogenizing member 310; the static diffuser 610 and the dynamic diffuser 620 cooperate with each other to ensure sufficient diffusion of the laser light 500.

[0094] In some embodiments, the projection device 10 may further include a second relay lens 700, which is disposed between the second homogenizing element 320 and the light valve 400; the laser 500 emitted through the second homogenizing element 320 is configured to be emitted toward the light valve 400 through the second relay lens 700. In this configuration, the presence of the second relay lens 700 can adjust the irradiation range of the laser 500, so that the laser 500 can irradiate more effective areas of the light exit surface 410 on the light valve 400. Specifically, the second relay lens 700 may be composed of two convex lenses. It should be noted that the first relay lens and the second relay lens may be part of the light homogenizing assembly.

[0095] In addition, the embodiment of the present application further provides a projection device 10, including a light-emitting component 100, a first homogenizing member 310, and a second homogenizing member 320. The light-emitting component 100 is used to provide a plurality of first light-emitting members 120, a second light-emitting member 130, and a third light-emitting member 110. The three light-emitting members are respectively used to emit lasers 500 with different wavelengths; the laser 500 emitted by the first light-emitting member 120 is used to form a first light spot 521, and the laser 500 emitted by the second light-emitting member 130 is used to form a second light spot 531; the plurality of first light-emitting members 120 and the plurality of second light-emitting members 130 are arranged on the light-emitting component 100. The first homogenizer 310 is used to be arranged on the light output path of the light emitting component 100, and is used to homogenize the laser 500, so that the geometric center distance between the first light spot 521 and the second light spot 531 emitted by the first homogenizer 310 is smaller than the geometric center distance between the first light spot 521 and the second light spot 531 emitted on the first homogenizer 310; the second homogenizer 320 is used to be arranged on the light output path of the first homogenizer 310, and is used to homogenize and shape the laser 500, so that lasers 500 of different wavelengths evenly cover more effective areas of the light valve 400. Through the mutual cooperation of the first homogenizer 310 and the second homogenizer 320, the speckle effect in the projection process can be reduced, the occurrence of color cast problems can be reduced, and the quality of the projection picture can be guaranteed.

[0096] On the basis of the above embodiments, the present application further provides a projection system, including a projection screen 20 and a projection device 10 in any one of the above embodiments, wherein the projection device 10 is used to project a projection picture onto the projection screen 20 .

[0097] Specifically, Fig.12 As shown, the projection device 10 has a housing 940, and the housing 940 has a receiving cavity inside, and the light emitting assembly 100, the first homogenizing element 310, the second homogenizing element 320 and the light valve 400 are all located in the receiving cavity. Fig.12 Also shown is a scene diagram when the projection device 10 is projecting onto the projection screen 20. The projection screen 20 is located obliquely above the projection device 10. The projection screen 20 can be set on a flat mounting carrier such as a wall to ensure the flatness of the projection screen 20. The laser 500 reflected by the light valve 400 can be directed toward the lens 800, and the light directed toward the lens 800 can pass through the lens 800 and form an image on the projection screen 20.

[0098] In the description of the present application, it should be understood that, in addition, the terms "including" and "having" and any variations thereof are intended to cover but not exclude inclusion. The orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0099] 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.

[0100] For ease 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 intended 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 projection device, characterized in that: include: A light-emitting component, the light-emitting component comprising a plurality of first light-emitting components, a second light-emitting component and a third light-emitting component, the three light-emitting components are respectively used to emit lasers with different wavelengths; the lasers emitted by the first light-emitting components are used to form a first light spot, and the lasers emitted by the second light-emitting components are used to form a second light spot; the plurality of first light-emitting components and the plurality of second light-emitting components are asymmetrically arranged on the light-emitting component; a first homogenizing element, the first homogenizing element being located on a light-emitting path of the light-emitting component and being used to homogenize the laser light so that a geometric center distance between the first light spot and the second light spot emitted through the first homogenizing element is smaller than a geometric center distance between the first light spot and the second light spot incident on the first homogenizing element; The second homogenizing element is located on the light output path of the first homogenizing element and is used to homogenize and shape the laser light so that the laser light of different wavelengths uniformly covers more effective areas of the light valve.

2. The projection device according to claim 1, characterized in that: The lasers emitted by the first light emitting element, the second light emitting element and the third light emitting element are green light, blue light and red light respectively; and / or the number of the first light-emitting elements and the second light-emitting elements is less than the number of the third light-emitting elements; And / or, a plurality of the third light-emitting elements are arranged in a row, and a plurality of the first light-emitting elements and a plurality of the second light-emitting elements are arranged in a row.

3. The projection device according to claim 1, characterized in that: The first homogenizing element and the second homogenizing element are double-sided fly-eye lenses, and the optical axes of the first homogenizing element and the second homogenizing element coincide with each other; Along a direction perpendicular to the optical axis of the second homogenizing element, the cross section of the second homogenizing element is circular; Along the optical axis direction of the first homogenizer, both sides of the first homogenizer have a plurality of closely arranged first microlenses; along the optical axis direction perpendicular to the first homogenizer, the cross section of the first microlens is a regular polygon.

4. The projection device according to claim 3, characterized in that: Along the optical axis direction of the second homogenizer, both sides of the second homogenizer have a plurality of closely arranged second micro lenses; along the direction perpendicular to the optical axis of the second homogenizer, the cross section of the second micro lenses is rectangular; And / or, the projection device also includes a first relay lens, which is arranged between the first homogenizer and the second homogenizer, and the laser emitted through the first homogenizer is configured to pass through the first relay lens and the second homogenizer in sequence; the first relay lens is used to adjust the irradiation range of the laser.

5. The projection device according to any one of claims 1 to 4, characterized in that: It also includes a beam splitting component, which is located between the light emitting component and the first homogenizer along the optical path of the laser. The beam splitting component is used to receive the laser emitted by the light emitting component to split the single beam of the laser into multiple beams, and direct the multiple beams of the laser toward the first homogenizer.

6. The projection device according to claim 5, characterized in that: The beam splitter assembly comprises a first beam splitter and a second beam splitter, wherein the first beam splitter is located on the light emitting path of the light emitting assembly; The first beam splitter is used to make the incident light partially reflected along the first direction to the first homogenizing element, and partially transmitted along the second direction to the second beam splitter; The second beam splitter is used to reflect the incident light partially transmitted along the second direction to the first homogenizer along the first direction.

7. The projection device according to claim 6, characterized in that: There are multiple beam splitting assemblies, and each of the first light emitting element, the second light emitting element, and the third light emitting element is provided with a corresponding beam splitting assembly on the light emitting path; Incident light reflected along a first direction by a first beam splitter in the beam splitter assembly corresponding to the first light emitting element and the second light emitting element is configured to be emitted toward the first homogenizing element after passing through the first beam splitter in the beam splitter assembly corresponding to the third light emitting element; The incident light reflected along the first direction by the second beam splitter in the beam splitter assembly corresponding to the first light emitting element and the second light emitting element is configured to be emitted toward the first homogenizing element after passing through the second beam splitter in the beam splitter assembly corresponding to the third light emitting element.

8. The projection device according to any one of claims 1 to 4, characterized in that: It also includes a diffuser, which is arranged between the light-emitting component and the first homogenizing component; the laser emitted by the light-emitting component is configured to pass through the diffuser and the first homogenizing component in sequence; the diffuser is used to adjust the irradiation range of the laser; And / or, the projection device further includes a second relay lens, which is disposed between the second homogenizer and the light valve; the laser emitted through the second homogenizer is configured to be emitted toward the light valve through the second relay lens.

9. A projection device, characterized in that: include: A light-emitting component, the light-emitting component is used to provide a plurality of first light-emitting components, a second light-emitting component and a third light-emitting component, the three light-emitting components are respectively used to emit lasers with different wavelengths; the lasers emitted by the first light-emitting components are used to form a first light spot, and the lasers emitted by the second light-emitting components are used to form a second light spot; the plurality of first light-emitting components and the plurality of second light-emitting components are configured to be asymmetrically arranged on the light-emitting component; a first homogenizing member, which is used to be arranged on a light output path of the light emitting component and is used to homogenize the laser so that a geometric center distance between the first light spot and the second light spot emitted through the first homogenizing member is smaller than a geometric center distance between the first light spot and the second light spot emitted on the first homogenizing member; The second homogenizing element is used to be arranged on the light output path of the first homogenizing element, and is used to homogenize and shape the laser light so that the laser light of different wavelengths uniformly covers more effective areas of the light valve.

10. A projection system, characterized in that: It comprises a projection screen and the projection device according to any one of claims 1 to 9, wherein the projection device is used to project a projection picture onto the projection screen.

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