Projection device
By setting multiple uniform elements and beam shaping elements on the beam transmission path of the projection device, the speckle problem caused by uneven beam energy distribution is solved, and the display quality of the projected picture is improved.
Patent Information
- Application Number
- CN202311851995.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2025-07-01
AI Technical Summary
In existing projection equipment, the beam energy distribution of the laser beam is poor, resulting in serious speckle phenomenon and affecting the screen display effect.
At least two uniform elements are provided on the beam transmission path of the projection device, and a beam shaping element is provided between adjacent uniform elements. The uniform light beam is shaped through the beam shaping element, so that the slope of the expansion angle change curve of the light beam is reduced, thereby improving the consistency of spot distribution and energy uniformity.
The spot distribution consistency and energy distribution uniformity of the uniform beam are improved, the speckle is reduced, and the display effect of the projected image is improved.
Smart Images
Figure CN120233618A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the field of display technology. More specifically, it relates to a projection device. Background Art
[0002] In a projection device, laser beams of different colors need to be combined, and the combined beam needs to be homogenized. In the prior art, multiple different-color beams emitted by a laser light source form a combined beam through a beam combining component, and then the combined beam forms a homogenized beam after being homogenized by a light guide tube in the beam path. Among them, the slope of the beam expansion angle change curve of the homogenized beam from the beam central axis to the edge direction is relatively high, that is, the angle distribution consistency is poor, resulting in poor uniformity of the beam energy distribution, making the speckle energy in the central region sharp, which is not conducive to reducing speckles. Summary of the Invention
[0003] The present application provides a projection device for solving the speckle problem caused by poor uniformity of the beam energy distribution.
[0004] The technical solution provided by the present application is as follows:
[0005] The present application provides a projection device, including:
[0006] A light-emitting component for emitting at least two different-color initial light rays;
[0007] A beam combining component located in the light-emitting path of the light-emitting component for combining the at least two different-color initial light rays to form a combined beam;
[0008] A light homogenizing component including at least two light homogenizing elements located on the transmission path of the combined beam for homogenizing the incident beam and outputting it;
[0009] At least one beam shaping element is disposed between at least two adjacent light homogenizing elements along the transmission path of the beam;
[0010] Wherein, the beam shaping element is used to receive a first beam and shape and output a second beam; the slope of the change curve of the expansion angle of the second beam is less than the slope of the change curve of the expansion angle of the first beam.
[0011] As can be seen from the above technical solutions, the projection device provided in this application sets at least two light homogenizing elements on the light beam transmission path, and sets at least one beam shaping element between two adjacent light homogenizing elements. The beam shaping element shapes the homogenized light beam emitted by the previously arranged light homogenizing element among the two adjacent light homogenizing elements, so that the beam shaping element receives the first beam and outputs the second beam. The slope of the change curve of the divergence angle of the second beam is smaller than the slope of the change curve of the divergence angle of the first beam, which is conducive to improving the uniformity of the spot distribution of the homogenized light beam and the uniformity of the light beam energy distribution. Since the uniformity of the spot distribution of the homogenized light beam after shaping is improved and the light beam energy distribution is uniform, when it is incident on the other light homogenizing element among the two adjacent light homogenizing elements again, it is conducive to improving the homogenization effect and reducing speckle, thereby being conducive to improving the display effect of the projected image. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] To more clearly illustrate the embodiments of this application or the implementation manners in the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.
[0013] Figure 1 FIG. shows a schematic structural diagram of a projection system provided by an embodiment of this application;
[0014] Figure 2 FIG. shows a schematic diagram of the light beam spot distribution in a first light homogenizing element provided by an embodiment of this application;
[0015] Figure 3 FIG. shows a schematic diagram of the spot distribution of a first beam provided by an embodiment of this application;
[0016] Figure 4 FIG. shows a schematic diagram of the spot distribution of a second beam provided by an embodiment of this application;
[0017] Figure 5 FIG. shows a schematic structural diagram of another projection device provided by an embodiment of this application;
[0018] Figure 6 FIG. shows a schematic structural diagram of yet another projection device provided by an embodiment of this application;
[0019] Figure 7 FIG. shows a schematic structural diagram of yet another projection device provided by an embodiment of this application;
[0020] Figure 8 FIG. shows a schematic structural diagram of yet another projection device provided by an embodiment of this application;
[0021] Figure 9 Shows a schematic structural diagram of a light guide tube provided by an embodiment of the present application;
[0022] Figure 10 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0023] Figure 11 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0024] Figure 12 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0025] Figure 13 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0026] Figure 14 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0027] Figure 15 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0028] Figure 16 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0029] Figure 17 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0030] Figure 18 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0031] Figure 19 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0032] Figure 20 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0033] Figure 21 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application;
[0034] Figure 22 Shows a schematic structural diagram of another projection device provided by an embodiment of the present application. Detailed implementation manners
[0035] To make the objectives and implementation manners of this application clearer, the following will clearly and completely describe the exemplary implementation manners of this application in conjunction with the accompanying drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only a part, rather than all, of the embodiments of this application.
[0036] It should be noted that the brief description of the terms in this application is only for facilitating the understanding of the subsequent described implementation manners, rather than intending to limit the implementation manners of this application. Unless otherwise specified, these terms should be understood in their ordinary and common meanings.
[0037] The terms "comprising" and "having" and any variations thereof are intended to cover inclusion without exclusivity. For example, a product or device comprising a series of components does not necessarily have to be limited to all the clearly listed components, but may include other components that are not clearly listed or are inherent to these products or devices.
[0038] In the related art, multiple different-color light beams emitted by a laser light source form a combined light beam through a light combining component, and then the combined light beam is homogenized by a light guide tube in the light beam path to form a homogenized light beam. Among them, the slope of the change curve of the light beam expansion angle along the direction from the center axis to the edge of the homogenized light beam is relatively high, that is, the angular distribution consistency is poor (the spot distribution as shown in Figure 3 can be referred to), resulting in poor uniformity of the light beam energy distribution and sharp speckle energy in the central region.
[0039] To solve the technical problems existing in the related art, the embodiments of this application provide a projection system. The projection device provided by the embodiments of this application sets at least two homogenizing elements on the light beam transmission path, and at least one beam shaping element is arranged between two adjacent homogenizing elements. The beam shaping element shapes the homogenized light beam emitted by the previously arranged homogenizing element among the two adjacent homogenizing elements, so that the beam shaping element receives a first beam and outputs a second beam, and the slope of the change curve of the expansion angle of the second beam is less than the slope of the change curve of the expansion angle of the first beam. Thereby, it is beneficial to improve the spot distribution consistency of the homogenized light beam and the uniformity of the light beam energy distribution; due to the improved spot distribution consistency of the shaped homogenized light beam and the uniform light beam energy distribution, when it is incident on the other homogenizing element among the two adjacent homogenizing elements again, it is beneficial to improve the homogenization effect and reduce speckle, thereby being beneficial to improving the display effect of the projected picture.
[0040] The following will give an exemplary illustration of the projection system provided by the embodiments of this application in conjunction with the attached Figure 1 to the attached Figure 22 .
[0041] Figure 1 is a schematic structural diagram of a projection system provided by the embodiments of this application. AsFigure 1 As shown, the projection system includes: a light-emitting component 02, a light-combining component 03, a light-homogenizing component 04, and a beam shaping element 05. Among them, the light-homogenizing component 04 includes at least two light-homogenizing elements. Figure 1 Exemplarily, it is shown that the light-homogenizing component includes two light-homogenizing elements, which are respectively shown as a first light-homogenizing element 041 and a second light-homogenizing element 042.
[0042] Among them, the light-emitting component 02 is disposed on the substrate 01, and the light-emitting component 02 is used to emit at least two different-color laser beams. Exemplarily, the light-emitting component 02 can be specifically set as a laser component, and the laser component includes a red laser chip R, a green laser chip G, and a blue laser chip B. Integrating the red laser chip R, the green laser chip G, and the blue laser chip B into one laser component forms the light-emitting component 02 as Figure 1 shown, so that the light-emitting component 02 can emit three different-color initial light rays.
[0043] In some embodiments, two different-color laser chips can also be integrated into one laser component according to requirements to form the light-emitting component 02 as Figure 1 shown. For example, the red laser chip R and the green laser chip G are integrated into one laser component, or the red laser chip R and the blue laser chip B are integrated into one laser component, or the green laser chip G and the blue laser chip B are integrated into one laser component, so that the light-emitting component 02 can emit two different-color initial light rays. Figure 1 Only the laser component including the red laser chip R, the green laser chip G, and the blue laser chip B is exemplarily shown herein, and the embodiments of the present application are not limited thereto. Among them, the laser component can be an independent red, green, and blue three-color laser component, or a packaging component including three-color light-emitting chips, which is not limited herein.
[0044] Among them, the light-combining component 03 is located in the light-emitting path of the light-emitting component 02 and is used to combine a variety of different-color initial light rays emitted by the light-emitting component 02 to form a combined light beam. For example, the Figure 1 three-color initial light rays in can be combined to form a combined light beam.
[0045] Exemplarily, the light-combining component 03 can be set as a plurality of beam combiners, and a plurality of beam combiners are used to combine a plurality of initial light rays emitted by the light-emitting component 02. Specifically, as Figure 1As shown in the figure, a first beam combiner 031 is provided corresponding to the red laser chip R, a second beam combiner 032 is provided corresponding to the green laser chip G, and a third beam combiner 033 is provided corresponding to the blue laser chip B. Thus, the first beam combiner 031, the second beam combiner 032, and the third beam combiner 033 form a beam combining component 03, and the beam combining component 03 is used to combine multiple beams of light emitted by the light emitting component 02 to form a combined light beam.
[0046] Specifically, different beam combiners are arranged on the outgoing light paths of the outgoing light regions that emit corresponding color beams. The corresponding beam combiners can reflect the beams of the corresponding outgoing light regions, and the reflected beams are all along the entrance direction of the light homogenizing element, and the beams of each color are converged to form a combined light beam. The multiple beam combiners have an angle with the outgoing light direction of the corresponding outgoing light region, which is used to reflect the beams emitted from the corresponding outgoing light region to the entrance direction of the light homogenizing element. The multiple beam combiners are arranged in sequence facing the outgoing light port direction of the laser light source, and at least one beam combiner can transmit the beams of the corresponding colors in other outgoing light regions and combine them with the beams it reflects.
[0047] Exemplarily, the angles between the light receiving surfaces of the first beam combiner 031, the second beam combiner 032, and the third beam combiner 033 and the beams emitted by the green laser chip G, the blue laser chip B, and the red laser chip R in the light emitting region of the laser assembly can all be set to 45°±2°. Among them, the first beam combiner 031 can be set as a reflector, the second beam combining lens and the third beam combining lens can both be set as dichroic sheets, and the first beam combiner 031, the second beam combiner 032, and the third beam combiner 033 are arranged in parallel with each other. Thus, Figure 1 the light emitted by the red laser chip R in can pass through the second beam combiner 032 after being reflected by the first beam combiner 031, and the light emitted by the green laser chip G can pass through the third beam combiner 033 after being reflected by the second beam combiner 032, thereby forming a combined light beam.
[0048] Among them, at least two light homogenizing elements are arranged on the transmission path of the combined light beam, and the light homogenizing component 04 is used to perform light homogenizing processing on the combined light beam formed by the beam combining component 03. Exemplarily, Figure 1 shows that the light homogenizing component 04 provided in the projection system includes two light homogenizing elements, namely a first light homogenizing element 041 and a second light homogenizing element 042. In some embodiments, three or more light homogenizing elements can also be provided in the beam transmission path according to requirements, and the embodiments of the present application are not limited thereto.
[0049] Among them, the beam shaping element 05 is used to shape the combined light beam. Exemplarily, as shown in Figure 1As shown, only one beam shaping element 05 is provided, and the beam shaping element 05 is disposed between the beam output end of the first light homogenizing element 041 and the beam input end of the second light homogenizing element 042. Thus, the combined light beam output by the light combining assembly 03 can be output as a homogenized first beam after being homogenized by the first light homogenizing element 041. Then, the first beam is incident on the beam shaping element 05. After receiving the first beam, the beam shaping element 05 shapes the first beam. Then, the shaped first beam, i.e., the second beam, is incident on the second light homogenizing element 042. Continuing to refer to Figure 1 , the combined light beam is incident on the first light homogenizing element 041 in the first direction X, and the first light homogenizing element 041 and the second light homogenizing element 042 are arranged in the first direction X.
[0050] In the above process, the beam shaping element 05 shapes the incident combined light beam, so that the slope of the change curve of the expansion angle of the combined light beam changes. Specifically, it can be that the slope of the change curve of the expansion angle of the second beam (i.e., the shaped combined light beam) is less than the slope of the change curve of the expansion angle of the first beam (i.e., the combined light beam before shaping). Among them, the slope of the change curve of the expansion angle can be understood as the degree of change of the light energy from the optical axis of the light spot along the radial direction outward, that is, the degree of change of the light spot light energy of the second beam is less than that of the first beam.
[0051] Exemplarily, Figure 2 is a schematic diagram of the light spot distribution of a beam in the first light homogenizing element provided by an embodiment of the present application, Figure 3 is a schematic diagram of the light spot distribution of a first beam provided by an embodiment of the present application, Figure 4 is a schematic diagram of the light spot distribution of a second beam provided by an embodiment of the present application. Combining Figures 1 to 4 , the light spot distribution of the combined light beam incident on the first light homogenizing element 041 is as shown in Figure 2 a rectangular distribution (the first light homogenizing element 041 is set to a rectangular shape), and the light spot distribution of the first beam after being homogenized by the first light homogenizing element 041 is as shown in Figure 3 a Gaussian distribution. As shown in Figure 3 , the slope of the change curve of the beam expansion angle of the first beam from the beam central axis to the edge direction is relatively high, that is, the angle distribution consistency is poor, resulting in poor uniformity of the beam energy distribution and easy to cause sharp speckle energy in the central region. The light spot distribution of the second beam formed after the first beam passes through the beam shaping element 05 is as shown in Figure 4 , and the consistency of the light spot distribution of the second beam is improved, which is beneficial to improving the uniformity of the beam energy distribution. Due to the improved consistency of the light spot distribution of the second beam and the uniform beam energy distribution, when the second beam passes through the second light homogenizing element 042 again, it is beneficial to improve the homogenization effect and reduce speckles, thereby being beneficial to improving the picture display effect.
[0052] It should be noted that Figure 1 In Figure 1 , only two light homogenizing elements are exemplarily shown as being arranged along the transmission path of the light beam, and a beam shaping element 05 is arranged between the two light homogenizing elements. In the embodiments of the present application, the light homogenizing assembly may also be arranged to include three light homogenizing elements. When three light homogenizing elements are arranged, two adjacent positions may be formed by the adjacent light beam exit end and light beam incident end in the corresponding light homogenizing elements. At this time, a beam shaping element may be arranged, and the beam shaping element may be arranged at any one of the adjacent positions. When three light homogenizing elements are arranged, two adjacent positions may be formed by the adjacent light beam exit end and light beam incident end in the corresponding light homogenizing elements, and two beam shaping elements may also be arranged. The two beam shaping elements are correspondingly arranged at the two adjacent positions, that is, at least one beam shaping element is arranged between two adjacent light homogenizing elements along the transmission path of the light beam.
[0053] The projection device provided by the embodiments of the present application arranges at least two light homogenizing elements on the light beam transmission path, and at least one beam shaping element 05 is arranged between two adjacent light homogenizing elements. The beam shaping element is used to shape the homogenized light beam emitted by the previously arranged light homogenizing element among the two adjacent light homogenizing elements, so that the beam shaping element receives the first beam and outputs the second beam, and the slope of the change curve of the expansion angle of the second beam is smaller than the slope of the change curve of the expansion angle of the first beam. Thereby, it is beneficial to improve the consistency of the spot distribution of the homogenized light beam and improve the uniformity of the light beam energy distribution; due to the improved consistency of the spot distribution of the homogenized light beam after shaping and the uniform light beam energy distribution, when it is incident on another light homogenizing element among the two adjacent light homogenizing elements again, it is beneficial to improve the homogenization effect and reduce speckle, and thus it is beneficial to improve the display effect of the projected picture.
[0054] In some embodiments, Figure 5 is a schematic structural diagram of another projection device provided by the embodiments of the present application. As Figure 5 shown, the projection device further includes a collimation structure 60. Among them, the collimation structure 60 may be arranged as a plurality of integrally formed collimation elements, and the plurality of collimation elements are arranged on the light emitting component 02, and each collimation element in the collimation structure 60 may correspond to a laser chip.
[0055] Specifically, the collimation structure 60 may include a first collimation element 061, a second collimation element 062, and a third collimation element 063. Among them, the first collimation element 061 is arranged corresponding to the red laser chip R, so as to collimate the red light emitted by the red laser chip R, and the collimated light is incident on the first beam combining mirror 031; the second collimation element 062 is arranged corresponding to the green laser chip G, so as to collimate the red light emitted by the green laser chip G, and the collimated light is incident on the second beam combining mirror 032; the third collimation element 063 is arranged corresponding to the blue laser chip B, so as to collimate the red light emitted by the blue laser chip B, and the collimated light is incident on the third beam combining mirror 033.
[0056] Exemplarily, the first collimation element 061, the second collimation element 062, and the third collimation element 063 may be specifically set as convex lenses, as long as the collimation function of light can be realized, and the embodiments of the present application are not limited thereto.
[0057] In some embodiments, Figure 6 is a schematic structural diagram of another projection device provided by the embodiments of the present application. Figure 7 is a schematic structural diagram of another projection device provided by the embodiments of the present application. As Figure 6 or Figure 7 or Figure 12 shown, the combined light beam is incident on the first light homogenizing element 041 along the first direction X. The first light homogenizing element 041 and the second light homogenizing element 042 are arranged along the second direction Y, and the first direction X is perpendicular to the second direction Y. At this time, the projection device may be provided with a beam steering element 06. By using the beam steering element 06, the light beam emitted from the first light homogenizing element 041 can be steered and incident on the second light homogenizing element 042. Compared with Figure 1 , setting the beam steering element 06 is beneficial to realizing the miniaturization setting of the projection device.
[0058] Specifically, the light homogenizing element may be set as a light pipe. Accordingly, Figure 6 or Figure 7 the first light homogenizing element 041 in Figure 6 or Figure 7 may be set as the first light pipe 411, and the second light homogenizing element 042 in
[0059] The optical axis of the first light pipe 411 and the optical axis of the second light pipe 422 may be parallel or have a preset angle, and the first light pipe 411 and the second light pipe 422 are located on the same side of the light beam steering element 06. Therefore, the light beam homogenized by the first light pipe 411 and shaped by the light beam shaping element 05 may be incident on the light beam steering element 06, and after being diverted by the light beam steering element 06, it may be incident on the second light pipe 422 for further homogenization.
[0060] By setting a preset angle between the optical axis of the first light pipe 411 and the optical axis of the second light pipe 422 and utilizing the angle relationship between the optical axis of the first light pipe 411 and the optical axis of the second light pipe 422, it is helpful to reduce the number of light beam steering elements 06 to be set, and the light beam shaped by the beam shaping element 05 can be incident on the second light pipe 422.
[0061] In addition, by setting the beam steering element 06, it is helpful to shorten the beam transmission path, thereby facilitating the integrated arrangement of various components in the projection device. Figure 1 The projection device is conducive to realizing the miniaturization of the projection device.
[0062] It should be noted that Figure 6 or Figure 7 Only one arrangement position of the beam steering element 06 and the beam shaping element 05 is shown exemplarily, and the specific arrangement positions of the beam steering element 06 and the beam shaping element 05 are not limited here. Figure 8 This is a schematic diagram of the structure of another projection device provided in an embodiment of the present application. Figure 8 As shown, the beam shaping element 05 is arranged on the beam emission path of the beam steering element 06, and Figure 6 or Figure 7 In the embodiment, the beam shaping element 05 is arranged on the beam receiving path of the beam steering element 06 .
[0063] In the above Figures 6 to 8 On the basis of Figure 9 A schematic diagram of the structure of a light guide provided in an embodiment of the present application. Figure 9 The light guide shown is formed by glass gluing, Figure 9 The light pipe shown includes a first light pipe 411 and a second light pipe 422. The first light pipe 411 is configured as a solid medium gap light pipe, and the second light pipe 422 is configured as an air gap light pipe surrounded by side walls, and the solid medium gap light pipe serves as a side wall of the second light pipe 422. There is a preset angle between the solid medium gap light pipe and the air gap light pipe, for example, 10-60 degrees, so that Figure 9 The light guide shown can be applied to Figures 6 to 8The first light homogenizing element 041 and the second light homogenizing element 042 therein can achieve a non-zero preset angle between the optical axis of the first light homogenizing element 041 (the first light guide tube 411) and the optical axis of the second light homogenizing element 042 (the second light guide tube 411).
[0064] Specifically, Figure 9 the first light guide tube 411 in Figures 6 to 8 can be used as the first light homogenizing element 041 in Figure 9 the second light guide tube 422 in Figures 6 to 8 can be used as the second light homogenizing element 042 in Figure 9 Thus, the combined light beam after the light combining component 03 can be homogenized at a small angle through the first light guide tube 411 as shown in Figure 9 After emitting light from the outlet of the first light homogenizing element 041, it passes through the beam shaping element 05 to form a second light beam. After the second light beam is deflected by the beam turning element 06, it is incident into the second light guide tube 422 as shown in
[0065] In some embodiments, the beam shaping element 05 and the beam turning element 06 can be integrally arranged together. By integrally arranging the beam shaping element 05 and the beam turning element 06 together, it is beneficial to realize the miniaturized setting of the projection device. The integrally arranged beam shaping element 05 and beam turning element 06 can be called a beam shaping and turning structure 56.
[0066] Based on this, Figure 10 is a schematic structural diagram of another projection device provided by an embodiment of the present application. As shown in Figure 10 The beam shaping element 05 and the beam turning element 06 in Figures 6 to 8 can be integrally arranged together to form a beam shaping and turning structure 56. Thus, by setting the beam shaping and turning structure 56 as shown in Figure 10 while realizing the miniaturized setting of the projection device, when the light beam emitted from one of the two adjacent light homogenizing elements is shaped and then incident into the other of the two adjacent light homogenizing elements, it is beneficial to improve the homogenization effect and reduce speckle, thereby being beneficial to improving the display effect of the projected image.
[0067] Exemplarily, Figure 11 is an optical path schematic diagram of a light beam passing through the beam shaping and turning structure provided by an embodiment of the present application. On the basis of Figure 10 as shown in Figure 11As shown, the light beam emitted from the light beam exit surface 07 of the first light pipe 411 is incident on the light beam shaping and steering structure 56. The light beam is shaped and steered by the light beam shaping and steering structure 56, and then is incident into the second light pipe 422 through the light beam incident surface 08 of the second light pipe 422.
[0068] Exemplarily, the light beam shaping element 05 may include a lens structure. Specifically, the lens structure may be set as a convex lens, a concave lens or other lenses or lens groups. Thus, the first light beam output by the first light homogenizing element 041 can be shaped to output a second light beam, and it is only necessary to ensure that the slope of the change curve of the expansion angle of the second light beam is smaller than the slope of the change curve of the expansion angle of the first light beam. The specific structural form of the lens structure is not limited in the embodiments of the present application.
[0069] Exemplarily, the light beam steering element 06 may include a reflection structure. Specifically, the reflection structure may be set as a mirror, etc., as long as the light beam can be steered. The specific structure of the reflection structure is not limited in the embodiments of the application.
[0070] In some embodiments, Figure 12 is a schematic structural diagram of another projection device provided by the embodiments of the present application. As Figure 12 shown, the first light homogenizing element 041 and the second light homogenizing element 042 provided in the projection device are located on the same side of the light beam steering element 06. It should be noted that, Figure 12 the optical axes of the first light homogenizing element 041 and the second light homogenizing element 042 are parallel. At this time, a plurality of light beam steering elements 06 need to be provided to steer the light beam emitted from the first light homogenizing element 041 into the second light homogenizing element 042. Specifically, as Figure 12 shown, the first light beam steering element 061 and the second light beam steering element 062 are provided. The light beam emitted from the first light homogenizing element 041 passes through the first light beam steering element 061 to the light beam shaping element 05, and then passes through the second light beam steering element 062 and is incident on the second light homogenizing element 042.
[0071] It should be noted that, Figure 12 the first light beam steering element 06, the second light beam steering element 062 and the light beam shaping element 05 in
[0072] In some embodiments, Figure 13 is a schematic structural diagram of another projection device provided by the embodiments of the present application. As Figure 13 shown, the projection device further includes: an optical isolation element 09.
[0073] Among them, the optical isolation element 09 is located between the light combining component 03 and the light homogenizing element. At this time, the first light homogenizing element 041 and the second light homogenizing element 042 can share the same light guide tube. By sharing the same light guide tube, after the combined light beam is homogenized by the light guide tube and then incident on the beam shaping element 05 and the beam steering element 06, it enters the light guide tube again for homogenization.
[0074] Specifically, the optical isolation element 09 may include a transmission part 091 and a reflection part 092. The combined light beam passing through the light combining component 03 can enter the light guide tube through the transmission part 091 of the optical isolation element 09. The first light beam output after being homogenized by the light guide tube is shaped by the beam shaping element 05 to output a second light beam. Subsequently, the second light beam enters the light guide tube again for homogenization after being steered by the beam steering element 06. The homogenized light beam can be reflected by the reflection part 092 of the optical isolation element 09, and the reflected light beam can enter Figure 22 the reflection lens structure 015 in it and be reflected to the light modulation component 013. Then, the light modulation component 013 transmits the light beam carrying the image information to the projection lens 014, and the projection lens 014 magnifies the light beam carrying the image information to form a projection image.
[0075] In some embodiments, the projection device further includes a homogenizing device 010, and the homogenizing device 010 can be disposed at least at one position between the light combining component 03 and the light homogenizing component 04, between the light homogenizing component 04 and the beam shaping element 05, and between the light homogenizing component 04 and the beam steering element 06.
[0076] In some embodiments, Figure 14 is a schematic structural diagram of another projection device provided by an embodiment of the present application. As Figure 14 shown, a homogenizing device 010 can be disposed between the light combining component 03 and the light homogenizing component 04, and the light beam after passing through the homogenizing device 010 then enters the light homogenizing component 04, which is beneficial to improving the light homogenizing effect.
[0077] In some embodiments, Figure 15 is a schematic structural diagram of another projection device provided by an embodiment of the present application. As Figure 15 shown, a homogenizing device 010 can also be disposed between the light homogenizing component 04 and the beam shaping element 05.
[0078] In some embodiments, Figure 16 is a schematic structural diagram of another projection device provided by an embodiment of the present application. As Figure 16As shown, a homogenizing device 010 can also be provided between the beam shaping element 05 and the beam steering element 06. Specifically, the homogenizing device 010 is located on the right side of the first light guide tube 411 and the second light guide tube 422, and on the left side of the beam steering element 06, that is, both the first light guide tube 411 and the second light guide tube 422 are located on the same side of the homogenizing device 010 facing away from the beam steering element 06. Thus, speckle reduction can be achieved once before and after the beam is steered by the beam steering element 06, which is beneficial to improving the speckle reduction effect on the beam.
[0079] Exemplarily, the homogenizing device 010 can be a diffusion wheel formed by a rotating diffuser. By rotating diffusion, the speckles of the beam transmitted on the beam path can be reduced to improve the beam quality and reduce the speckle effect of the projected image. The beam after diffusion then enters the light homogenizing element, which is beneficial to improving the light homogenizing effect. It should be noted that Figures 14 to 16 only one homogenizing device 010 is exemplarily shown in the beam transmission path of the projection device, which constitutes a limitation on the projection device provided by the embodiments of the present application.
[0080] Exemplarily, Figure 17 is a schematic structural diagram of another projection device provided by the embodiments of the present application. As Figure 17 shown, a homogenizing device 010 is provided between the light combining component 03 and the light homogenizing component 04, and a homogenizing device 010 is provided between the beam shaping element 05 and the beam steering element 06.
[0081] In some embodiments, Figure 18 is a schematic structural diagram of another projection device provided by the embodiments of the present application. As Figure 18 shown, the projection device further includes a beam shrinking element 011.
[0082] Specifically, the beam emitted by the light emitting component 02, such as a laser component, is combined by the light combining component 03, such as a beam combiner, and then emitted towards the light homogenizing component 04. In order to further obtain a beam with a smaller spot, a beam shrinking element 011 is provided between the light combining component 03 and the light homogenizing component 04 to converge the combined beam and reduce the spot size.
[0083] Exemplarily, the beam shrinking element 011 can be specifically set as a focusing mirror. By setting a focusing mirror in the beam transmission path, the received third beam is shrunk by the focusing mirror, and then the shrunk fourth beam is output, so that the spot diameter corresponding to the fourth beam is smaller than the spot diameter corresponding to the third beam.
[0084] Figure 18Exemplarily, the beam constriction element 011 is independently disposed between the light combining component 03 and the light homogenizing component 04. In some embodiments, the beam constriction element 011 and the beam shaping element 05 may also be integrally disposed, which is conducive to realizing the miniaturized setting of the projection device.
[0085] Combined with the above, the beam shaping element 05 and the beam steering element 06 may be integrally disposed. Therefore, the beam constriction element 011, the beam shaping element 05, and the beam steering element 06 may be integrally disposed together, which is conducive to realizing the miniaturized setting of the projection device.
[0086] Exemplarily, Figure 19 is a schematic structural diagram of another projection device provided by an embodiment of the present application. As Figure 19 shown, the beam constriction element 011 may also be disposed between the homogenizing device 010 and the light homogenizing component 04.
[0087] In some embodiments, Figure 20 is a schematic structural diagram of another projection device provided by an embodiment of the present application. As Figure 20 shown, the projection device includes an illumination component 012, a light modulation component 013, and a projection lens 014.
[0088] Among them, the illumination component 012 can receive the beam output by the second light homogenizing element 042, and is specifically used to adjust the size and angle of the beam output by the second light homogenizing element 042, so that the beam after being adjusted by the illumination component 012 is incident on the light modulation component 013, so that the beam incident on the light modulation component 013 meets the working requirements of the light modulation component 013.
[0089] Exemplarily, Figure 21 is a schematic structural diagram of another projection device provided by an embodiment of the present application. As Figure 21 shown, the illumination component 012 may include a first illumination structure 121, a steering structure 123, and a second illumination structure 122. Specifically, the beam output by the second light homogenizing element 042 is incident on the first illumination structure 121, the first illumination structure 121 adjusts the size of the incident beam, the beam after being adjusted by the first illumination structure 121 is incident on the steering structure 123, the steering structure 123 adjusts the angle of the beam output by the first illumination structure 121, and then outputs it to the second illumination structure 122. The second illumination structure 122 adjusts the size of the incident beam and then is incident on the light modulation component 013.
[0090] Among them, the optical modulation component 013 includes an optical modulator, which is an optical modulation device and can specifically be a DMD (digital micromirror devices) chip. Thousands of tiny mirrors can be arranged on its surface, and each mirror can be driven to deflect independently to modulate light. The optical modulator can modulate the light output by the lighting component 012 based on an electrical signal drive, so that the light carries image information.
[0091] Among them, the projection lens 014 may include a combination of multiple lenses, which are usually divided into groups and can be divided into a three-section type of front group, middle group, and rear group, or a two-section type of front group and rear group. The front group is the lens group close to the light-emitting component 02 on the light-emitting side, and the rear group is the lens group close to the light-emitting side of the optical modulation component 013. In an ultra-short-throw projection device, the projection lens is an ultra-short-throw projection lens.
[0092] Such as Figure 21 shown, the projection device may further include a reflective lens structure 015. Specifically, the light beam emitted by the second lighting structure 122 can be reflected by the reflective lens structure 015 to the optical modulation component 013. Then, the optical modulation component 013 transmits the light beam carrying image information to the projection lens 014, and the projection lens 014 magnifies the light beam carrying image information to form a projection image.
[0093] Exemplarily, Figure 22 is a schematic structural diagram of another projection device provided by an embodiment of the present application. Such as Figure 22 shown, the light beam emitted by the optical isolation element 09 can be reflected by the reflective lens structure 015 to the optical modulation component 013. Then, the optical modulation component 013 transmits the light beam carrying image information to the projection lens 014, and the projection lens 014 magnifies the light beam carrying image information to form a projection image.
[0094] 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 them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
[0095] For ease of explanation, the above description has been presented in connection with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be derived in accordance with the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific usage considerations.
Claims
1. A projection device, characterized in that, Comprising: A light-emitting component for emitting at least two different colors of initial light rays; A light-combining component located in the light-emitting path of the light-emitting component for combining the at least two different colors of initial light rays to form a combined light beam; A light homogenizing component including at least two light homogenizing elements located on the transmission path of the combined light beam for homogenizing and outputting the incident light beam; A beam shaping element, with at least one beam shaping element provided between two adjacent light homogenizing elements along the transmission path of the light beam; Wherein, the beam shaping element is used to receive a first light beam and shape and output a second light beam; the slope of the variation curve of the divergence angle of the second light beam is less than the slope of the variation curve of the divergence angle of the first light beam.
2. The projection device according to claim 1, wherein The light homogenizing component includes a first light homogenizing element and a second light homogenizing element adjacent to each other along the transmission path of the light beam; The light beam is incident on the first light homogenizing element in a first direction, and the first light homogenizing element and the second light homogenizing element are arranged along the first direction.
3. The projection device according to claim 1, characterized in that The light homogenizing component includes a first light homogenizing element and a second light homogenizing element adjacent to each other along the transmission path of the light beam; The light beam is incident on the first light homogenizing element in a first direction, and the first light homogenizing element and the second light homogenizing element are arranged in a second direction, the first direction being perpendicular to the second direction.
4. The projection device according to claim 3, characterized in that Further comprising: A beam turning element, with both the first light homogenizing element and the second light homogenizing element located on the same side of the beam turning element.
5. The projection device according to claim 4, characterized in that, The beam turning element is integrally provided with the beam shaping element.
6. The projection device according to claim 4, characterized in that, The beam turning element includes a reflection structure, and the beam shaping element includes a lens structure.
7. The projection device according to any one of claims 2-6, characterized in that, Both the first light homogenizing element and the second light homogenizing element are provided as light pipes.
8. The projection device according to claim 4, characterized in that, Further comprising: A homogenizing device located at least at one position between the light-combining component and the light homogenizing component, between the light homogenizing component and the beam shaping element, and between the beam shaping element and the beam turning element.
9. The projection device according to claim 1, wherein, Further comprising: A beam shrinking element located in the transmission path of the light beam for receiving a third light beam and shrinking and outputting a fourth light beam; the spot diameter corresponding to the fourth light beam is smaller than the spot diameter corresponding to the third light beam.
10. The projection device according to claim 1, wherein, Further comprising: An illumination component located after the light homogenizing element along the transmission path of the light beam for adjusting the size and angle of the light beam to meet the light beam incident requirements of the light modulation component; The light modulation component located after the illumination component along the transmission path of the light beam for modulating the light beam adjusted by the illumination component to form a light beam carrying the to-be-projected image information; A projection lens located after the light modulation component along the transmission path of the light beam for magnifying the light beam carrying the to-be-projected image information to form a projection image.