Projection equipment and projection system
By using the first and second focusing lenses in the projection device to converge the laser beam, the problem of low beam utilization in the prior art is solved, and a higher beam utilization is achieved.
Patent Information
- Application Number
- CN202421531640.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-29
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-06-29
AI Technical Summary
In existing projection equipment, when the laser beam emitted by the laser is incident on the lens, fewer beams that meet the lens incident angle, resulting in low beam utilization.
The projection device structure is adopted, including a laser light source, a light combining assembly, a focus lens group, a display element and a projection lens, wherein the focus lens group converges the laser beams emitted by the light combining assembly through the first and second focusing lenses, so that the light beams emitted by the second focusing lens incident the display element at the same incident angle, meeting the incident angle requirements of the projection lens.
By adding the second focusing lens, the beams that satisfy the incident angle of the projection lens are increased, and the beam utilization rate is improved.
Smart Images
Figure CN223051632U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of projection, in particular to a projection device and a projection system. Background Art
[0002] A projection device controls a light source by planar image information, and uses an optical system and a projection space to magnify an image and display it on a projection surface. During the operation of the projection device, a laser emits laser beams of multiple colors, modulates the laser beams so that the beams carry image information, and the modulated laser beams are incident on a lens, and the lens uses the laser beams for projection imaging. However, in the existing optical path, when the laser beams emitted by the laser are incident on the lens, there are few beams that satisfy the incident angle of the lens, reducing the beam utilization rate. Summary of the Utility Model
[0003] In the first aspect of the embodiment of the utility model, a projection device is provided, including:
[0004] A laser light source for emitting lasers of different wavelengths;
[0005] A light combining component located on the light emitting side of the laser light source for combining the lasers of different colors emitted by the laser light source;
[0006] A focusing lens group located on the light emitting side of the light combining component for focusing the laser beams emitted by the light combining component;
[0007] A display element located on the light emitting side of the focusing lens group, and the display element is used for modulating the incident laser according to the drive data of the image to be displayed to form a display image;
[0008] A projection lens located on the light emitting side of the display element for projecting and imaging the light emitted by the display element;
[0009] Wherein, the focusing lens group includes a first focusing lens and a second focusing lens arranged in sequence along the propagation direction of the laser beams emitted by the light combining component, the laser beams emitted by the light combining component include a first sub-beam and a second sub-beam arranged along the direction perpendicular to the propagation direction of the laser beams, the first sub-beam and the second sub-beam are incident on the first focusing lens at the same incident angle, the incident angles of the first sub-beam and the second sub-beam emitted after being converged by the first focusing lens are at least partially the same, the first sub-beam and the second sub-beam after being converged are incident on the second focusing lens, and the first sub-beam and the second sub-beam emitted after being converged by the second focusing lens are incident on the display element at the same incident angle.
[0010] In some embodiments of the present utility model, the focal length of the first focusing lens includes a first focal length, the focal length of the second focusing lens includes a second focal length, and the ratio of the first focal length to the second focal length is greater than 1.5.
[0011] In some embodiments of the present utility model, the projection device further includes:
[0012] A diffractive optical element, located between the light combining component and the focusing lens group, and an imaging surface of the diffractive optical element is located on an incident light surface of the display element.
[0013] In some embodiments of the present utility model, the projection device further includes:
[0014] A diffractive optical element, located between the light combining component and the first focusing lens; the diffractive optical element is configured to shape and homogenize an incident laser beam.
[0015] In some embodiments of the present utility model, the laser light source includes a plurality of first laser chips, second laser chips, and third laser chips arranged in an array; the wavelengths of the lasers emitted by the first laser chips, the second laser chips, and the third laser chips are different;
[0016] The light combining component includes a first light combining mirror, a second light combining mirror, and a third light combining mirror; the first light combining mirror is configured to reflect the laser emitted by the first laser chip toward the second light combining mirror; the second light combining mirror is configured to transmit the laser emitted by the first laser chip and reflect the laser emitted by the second laser chip; the third light combining mirror is configured to transmit the lasers emitted by the first laser chip and the second laser chip and reflect the laser emitted by the third laser chip.
[0017] In some embodiments of the present utility model, the diffractive optical element includes a first diffractive layer and a second diffractive layer stacked along a propagation direction of the laser beam emitted by the light combining component; the first diffractive layer diffracts the lasers emitted by the first laser chip and the second laser chip and transmits the laser emitted by the third laser chip; the second diffractive layer transmits the lasers emitted by the first laser chip and the second laser chip and diffracts the laser emitted by the third laser chip.
[0018] In some embodiments of the present utility model, the diffractive optical element includes a first diffractive layer, a second diffractive layer, and a third diffractive layer stacked along the propagation direction of the laser beam emitted by the light combining component; the first diffractive layer diffracts the laser emitted by the first laser chip and transmits the lasers emitted by the second laser chip and the third laser chip; the second diffractive layer transmits the lasers emitted by the first laser chip and the third laser chip and diffracts the laser emitted by the second laser chip; the third diffractive layer transmits the lasers emitted by the first laser chip and the second laser chip and diffracts the laser emitted by the third laser chip.
[0019] In some embodiments of the present utility model, the diffractive optical element is connected to a driving device, and the driving device is used to drive the diffractive optical element to vibrate along the fast axis direction and / or the slow axis direction of the laser beam emitted by the light combining component.
[0020] In some embodiments of the present utility model, the first laser chip is used to emit green laser, the second laser chip is used to emit blue laser, and the third laser chip is used to emit red laser.
[0021] In some embodiments of the present utility model, the projection device further includes: a prism assembly located between the display element and the projection lens; the prism assembly is used to reflect the laser emitted by the second focusing lens to the display element and transmit the light modulated by the display element to the projection lens.
[0022] In a second aspect of the embodiments of the present utility model, there is provided a projection system, including:
[0023] A projection device, where the projection device is the projection device according to any one of the first aspect;
[0024] A projection screen located on the light-emitting side of the projection device.
[0025] A projection device and a projection system provided by the embodiments of the present utility model include a light source that emits lasers of multiple colors, a light combining component for combining light, a first focusing lens and a second focusing lens, a display element, and a projection lens. The light combining component combines the laser beams of multiple wavelengths emitted by the laser light source, and the first focusing lens and the second focusing lens between the light combining component and the display element converge the light beams. The first sub-beam and the second sub-beam emitted by the second focusing lens enter the aperture at the same incident angle through the display element, so that the number of light beams that meet the incident angle of the projection lens increases, and the light beam utilization rate is improved. Description of the Drawings
[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for use in the embodiments of the present invention. Obviously, the accompanying drawings introduced below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.
[0027] Figure 1 One of the schematic diagrams of a projection device provided by an embodiment of the present invention;
[0028] Figure 2 A schematic diagram of an optical path with only a first focusing lens provided by an embodiment of the present invention;
[0029] Figure 3 One of the schematic diagrams of the optical path from a display element to a projection lens provided by an embodiment of the present invention;
[0030] Figure 4 Another schematic diagram of the optical path from a display element to a projection lens provided by an embodiment of the present invention;
[0031] Figure 5 Another schematic diagram of a projection device provided by an embodiment of the present invention;
[0032] Figure 6 A schematic diagram of the spot formed by the laser beam incident on a diffractive optical element provided by an embodiment of the present invention;
[0033] Figure 7 One of the schematic diagrams of an optical diffractive element provided by an embodiment of the present invention;
[0034] Figure 8 Another schematic diagram of an optical diffractive element provided by an embodiment of the present invention;
[0035] Figure 9 A schematic diagram of the spot formed in the far field by the laser beam entering a display element provided by an embodiment of the present invention;
[0036] Figure 10 A schematic diagram of a projection system provided by an embodiment of the present invention. Detailed implementation manners
[0037] To make the above objects, features, and advantages of the present utility model more apparent and understandable, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present utility model more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus repeated descriptions thereof will be omitted. The words expressing positions and directions described in the present utility model are illustrative with reference to the drawings, but can be changed as needed, and all changes are included within the protection scope of the present utility model. The drawings of the present utility model are only used to illustrate the relative positional relationship and do not represent the actual proportion.
[0038] The projection device controls the light source by planar image information, and uses the optical system and the projection space to magnify the image and display it on the projection surface. As Figure 1 shown, an embodiment of the present utility model provides a projection device, including: a laser light source 100, a light combining component 200, a focusing lens group 300, a display element 400, and a projection lens 500.
[0039] The laser light source 100 is used to emit lasers of different wavelengths.
[0040] The light combining component 200, located on the light-emitting side of the laser light source 100, is used to combine the lasers of different colors emitted by the laser light source.
[0041] The focusing lens group 300, located on the light-emitting side of the light combining component 200, is used to focus the laser beam emitted by the light combining component.
[0042] The display element 400 is located on the light-emitting side of the focusing lens group 300, and the display element 400 is used to modulate the incident laser according to the drive data of the image to be displayed to form a display image.
[0043] The projection lens 500, located on the light-emitting side of the display element 400, is used to project and image the light emitted by the display element.
[0044] Among them, the projection lens 500 includes a lens and a diaphragm 501, which is used to limit the light passing amount of the lens and filter stray light.
[0045] The display element 400 can adopt Liquid Crystal on Silicon (LCoS) or Digital Micromirror Device (DMD).
[0046] LCoS is formed by bonding a complementary metal oxide semiconductor (CMOS) substrate with a glass substrate containing a transparent electrode based on semiconductor technology, and then injecting liquid crystal for encapsulation. LCoS has the characteristics of high aperture ratio and high resolution of each pixel, and can form high-resolution images.
[0047] The DMD includes a plurality of micro mirrors, and each micro mirror can be individually driven to deflect. By controlling the deflection angle of the DMD, the brightness of the light incident on the projection lens 500 is controlled.
[0048] In view of the above situation, the projection device according to the embodiment of the present invention, such as Figure 1 As shown, the focusing lens group 300 includes a first focusing lens 301 and a second focusing lens 302 arranged in sequence along the propagation direction of the laser beam emitted by the light combining component.
[0049] Among them, the first focusing lens 301 is located on the light-emitting side of the light combining component 200, and is used for performing the first convergence on the laser beam emitted by the light combining component 200.
[0050] Combined with Figure 2 As shown, the laser light source emits lasers of different wavelengths. The light combining component combines the lasers of different wavelengths emitted by the laser light source; the laser beam emitted by the light combining component is incident on the first focusing lens. The laser beam emitted by the light combining component includes a first sub-beam and a second sub-beam arranged along the direction perpendicular to the propagation direction of the laser beam. The first sub-beam and the second sub-beam are incident on the first focusing lens at the same incident angle. For example, the first sub-beam is incident on different positions above the optical axis of the first focusing lens, and the second sub-beam is incident on different positions below the optical axis of the first focusing lens. The exit angles of the first sub-beam and the second sub-beam emitted after being converged by the first focusing lens 301 are at least partially the same.
[0051] Combined with Figure 2 As shown, taking the light beam L1 as an example to illustrate the propagation of the first sub-beam, and taking the light beam L2 as an example to illustrate the propagation of the second sub-beam. The light beam L1 is a single line arrow, and L2 is a single arrow. The light beams L1 and L2 are incident on the first focusing lens 301 at the same incident angle. The first focusing lens 301 converges the light beams L1 and L2. The exit angles of the light beams L1 and L2 emitted by the first focusing lens 301 are at least partially the same. If the light beams L1 and L2 after the convergence process are directly incident on the display element 400, the incident angles of the light beams L1 and L2 incident on the display element 400 are at least partially the same, indicating that the incident angles of the light beams L1 and L2 emitted by the display element 400 incident on the projection lens 500 are not completely the same.
[0052] The projection lens includes a diaphragm and a lens; the lens converges the light beams with the same incident angle incident on the projection lens, and the converged light beams pass through the diaphragm, and projection display is performed using the light passing through the diaphragm. The light passing through the diaphragm is also called the light that meets the incident angle requirements of the projection lens. However, the lens cannot converge the light with different incident angles incident on the projection lens. Therefore, when only the first focusing lens is provided, the incident angles of the light beam L1 and the light beam L2 emitted from the display element incident on the projection lens are not exactly the same, and the lens cannot converge the light beam, resulting in a relatively low light beam utilization rate.
[0053] Exemplarily, in combination with Figure 2 and Figure 3 As shown, taking the light beams emitted from points A, B1, and B2 on the display element 400 as an example, point A on the display element 400 is in the direction of the light beam center, and B1 on the display element 400 and B2 on the display element 400 are symmetric positions with respect to point A. Region C1 is the light spot of the light beam emitted from point A on the display element 400 passing through the diaphragm 501, region C2 is the light spot of the light beam emitted from point B1 on the display element 400 passing through the diaphragm 501, regions C3 and C5 are regions without light spots, region C4 is the light spot of the light beam emitted from point B2 on the display element 400 passing through the diaphragm 501, and the size of region C1 > the size of region C2 > the size of region C4.
[0054] As can be seen from the above, the incident angles of the light beams incident on different positions of the display element are not exactly the same, resulting in different amounts of the light beams emitted from different positions of the display element passing through the diaphragm, and the light beam utilization rate is relatively low.
[0055] In combination with Figure 1 As shown, the first sub-beam and the second sub-beam after convergence are incident on the second focusing lens 302. The first sub-beam and the second sub-beam emitted after being converged by the second focusing lens 302 are incident on the display element 400 at the same incident angle. When the display element 400 is incident on the projection lens at the same incident angle, the lens of the projection lens will converge the light rays incident at the same angle, and the converged light beam passes through the diaphragm, so that more light enters through the diaphragm for imaging, improving the light beam utilization rate.
[0056] Exemplarily, in combination with Figure 1 and Figure 4As shown, taking the light beams emitted from the display element 400 at positions A, B1, and B2 as an example, the area C6 is the light spot of the light beam emitted from position A on the display element 400 passing through the aperture 501, the area C7 is the light spot of the light beam emitted from position B1 on the display element 400 passing through the aperture 501, the area C8 is the light spot of the light beam emitted from position B2 on the display element 400 passing through the aperture 501, and the size of the area C6 = the size of the area C7 = the size of the area C8, so that the light spots at different positions are the same.
[0057] Among them, the area C7 is equivalent to the size of the area C2 + the size of the area C3; the area C8 is equivalent to the size of the area C4 + the size of the area C5. Then, after setting the second focusing lens, the amount of light beams emitted from positions B1 and B2 on the display element 400 passing through the aperture 501 is increased, improving the light beam utilization rate.
[0058] In the embodiment of the present utility model, a combining optical component is used to combine laser beams of multiple wavelengths emitted by a laser light source, so that the light spot centers of the laser beams of multiple wavelengths coincide, and the first focusing lens and the second focusing lens between the combining optical component and the display element are used. The first sub-beam and the second sub-beam emitted after the second focusing lens converges are incident on the display element at the same incident angle, so that the number of light beams that meet the incident angle of the projection lens increases, improving the light beam utilization rate.
[0059] In some embodiments, the focal length of the first focusing lens is the first focal length, the focal length of the second focusing lens is the second focal length, and the ratio of the first focal length to the second focal length is greater than 1.5. That is, the focal length ratio of the first focusing lens and the second focusing lens 302 is more than 1.5 times.
[0060] In some embodiments, the projection device further includes: a diffractive optical element, located between the combining optical component and the focusing lens group; the imaging surface of the diffractive optical element is located at the light incident surface of the display element, and the diffractive optical element is used to shape and homogenize the incident laser beam.
[0061] Specifically, the laser light source emits laser beams of multiple wavelengths, and the laser beams of multiple wavelengths are incident on the diffractive optical element. The diffractive optical element shapes and homogenizes each wavelength of the laser beam, so that the light spot of the emitted laser beam forms a specified shape with uniform energy.
[0062] In some embodiments, the laser light source includes a plurality of first laser chips, second laser chips, and third laser chips arranged in an array; the wavelengths of the lasers emitted by the first laser chips, second laser chips, and third laser chips are different.
[0063] The light combining component includes a first light combining mirror, a second light combining mirror, and a third light combining mirror; the first light combining mirror is used to reflect the laser emitted by the first laser chip towards the second light combining mirror; the second light combining mirror is used to transmit the laser emitted by the first laser chip and reflect the laser emitted by the second laser chip; the third light combining mirror is used to transmit the lasers emitted by the first laser chip and the second laser chip and reflect the laser emitted by the third laser chip.
[0064] For example, the first laser chip can emit a laser with a wavelength of 495 - 570 nm, that is, the first laser chip is used to emit green laser light. The second laser chip can emit a laser with a wavelength of 450 - 495, that is, the second laser chip is used to emit blue laser light. The third laser chip can emit a laser with a wavelength of 620 - 750, that is, the third laser chip is used to emit red laser light, thereby achieving full-color display.
[0065] The laser light source includes multiple laser chips arranged in an array. Combining Figure 1 and Figure 5 As shown, looking at the laser light source 100 from the side, there is 1 row of first laser chips 1101, 1 row of second laser chips 1102, and two rows of third laser chips 1103 arranged. The first light combining mirror is a reflecting mirror. The first light combining mirror 1201 is used to receive the green laser beam emitted by one row of first laser chips 1101 and reflect the green laser beam towards the second light combining mirror 1202. The second light combining mirror 1202 is a dichroic sheet. The second light combining mirror 1202 is used to transmit the green laser beam, receive the blue laser beam emitted by one row of second laser chips 1102, and reflect the blue laser beam towards the third light combining mirror 1203. The laser beam emitted by the second light combining mirror 1202 is a combined light beam of the green laser beam and the blue laser beam, and the beam centers of the green laser beam and the blue laser beam coincide. The third light combining mirror 1203 is a dichroic sheet. The third light combining mirror 1203 is used to transmit the green laser beam and the blue laser beam, receive the red laser beams emitted by two rows of third laser chips 1103, and reflect the red laser beams towards the diffractive optical element 700. The laser beam emitted by the third light combining mirror 1203 is a combined light beam of the green laser beam, the blue laser beam, and the red laser beam, and the beam centers of the green laser beam, the blue laser beam, and the red laser beam coincide.
[0066] The combined light of the green laser beam, the blue laser beam, and the red laser beam is incident on the diffractive optical element 700. Among them, the diffractive optical element includes multiple diffractive layers arranged in a stack; one diffractive layer corresponds to one color of laser and is used to shape and homogenize the incident laser beam of the corresponding color and transmit the laser beams of other colors. Combining Figure 5 As shown in the optical path, the spot formed by the laser beam incident on the diffractive optical element 700 is as shown in Figure 6As shown, in the fast axis direction, from top to bottom are a red light spot r1, a green light spot g1, a blue light spot b1, and a red light spot r2. The red light spot is represented by an ellipse with a triangle inside to represent the light spot of the red laser. The green laser light spot is represented by an ellipse with a square inside. The blue laser light spot is represented by an ellipse with a circle inside.
[0067] Exemplarily, in combination with Figure 7 As shown, the diffractive optical element includes a first diffractive layer and a second diffractive layer 702 stacked along the propagation direction of the laser beam emitted from the beam combining component; the first diffractive layer diffracts the laser light emitted from the first laser chip and the second laser chip, and transmits the laser light emitted from the third laser chip; the second diffractive layer transmits the laser light emitted from the first laser chip and the second laser chip, and diffracts the laser light emitted from the third laser chip.
[0068] When the combined light of the green laser beam, the blue laser beam, and the red laser beam is incident on the diffractive optical element, the first diffractive layer shapes and homogenizes the green laser beam and the blue laser beam, and transmits the red laser beam. The second diffractive layer shapes and homogenizes the red laser beam, and transmits the green laser beam and the blue laser beam.
[0069] Exemplarily, in combination with Figure 8 As shown, the diffractive optical element includes a first diffractive layer 801, a second diffractive layer 802, and a third diffractive layer 803 stacked along the propagation direction of the laser beam emitted from the beam combining component; the first diffractive layer diffracts the laser light emitted from the first laser chip, and transmits the laser light emitted from the second laser chip and the third laser chip; the second diffractive layer transmits the laser light emitted from the first laser chip and the third laser chip, and diffracts the laser light emitted from the second laser chip; the third diffractive layer transmits the laser light emitted from the first laser chip and the second laser chip, and diffracts the laser light emitted from the third laser chip.
[0070] When the combined light of the green laser beam, the blue laser beam, and the red laser beam is incident on the diffractive optical element, the first diffractive layer shapes and homogenizes the green laser beam, and transmits the red laser beam and the blue laser beam. The second diffractive layer shapes and homogenizes the blue laser beam, and transmits the green laser beam and the red laser beam. The third diffractive layer shapes and homogenizes the red laser beam, and transmits the green laser beam and the blue laser beam.
[0071] Wherein, the diffractive layer includes a plurality of stepped diffractive units. After the laser beam enters the diffractive layer, diffraction processing is performed through the stepped diffractive units, so that the light spot of the laser beam emitted from the diffractive layer forms a specified shape with uniform energy.
[0072] Homogenize the light spot through a diffractive optical element, and then pass the light beam through a first focusing lens and a second focusing lens. The light beam passing through the second focusing lens enters the display element. Since the divergence of the red laser beam is the largest, the sizes of the red light spots r22 and r11 are the largest. Then there is the blue light spot b2 stacked on the red light spots r22 and r11, and the green light spot g2 stacked on the blue light spot b2, in the shape of Figure 9 as shown.
[0073] The diffractive optical element is connected to a driving device, which is used to drive the diffractive optical element to vibrate along the fast axis direction and the slow axis direction of the laser beam emitted by the light combining component, or to drive the diffractive optical element to vibrate along the fast axis direction of the laser beam emitted by the light combining component, or the diffractive optical element vibrates along the slow axis direction of the laser beam emitted by the light combining component.
[0074] Exemplarily, when the diffractive optical element includes a first diffractive layer and a second diffractive layer, when the light combining component is incident on the diffractive optical element, drive the first diffractive layer and the second diffractive layer to vibrate along the fast axis direction and / or the slow axis direction of the laser beam emitted by the light combining component.
[0075] When the diffractive optical element includes a first diffractive layer, a second diffractive layer, and a third diffractive layer, when the light combining component is incident on the diffractive optical element, drive the first diffractive layer, the second diffractive layer, and the third diffractive layer to vibrate along the fast axis direction and / or the slow axis direction of the laser beam emitted by the light combining component.
[0076] Since each diffractive layer processes the laser of each color or the lasers of colors with similar wavelengths, during the driving process, along the two directions of the fast axis direction and the slow axis direction, or the fast axis direction, or the slow axis direction, the laser speckle can be improved.
[0077] Combined with Figure 1 and Figure 5 as shown, the projection device further includes: a prism assembly 700, located between the display element 400 and the projection lens 500; the prism assembly 700 is used to reflect the laser emitted by the second focusing lens 302 to the display element 400, and transmit the light modulated by the display element 400 to the projection lens 500.
[0078] Specifically, the first sub-beam and the second sub-beam emitted by the second focusing lens 302 are incident on the prism assembly 700, and the prism assembly 700 reflects them. The reflected first sub-beam and second sub-beam are incident on the display element 400. The display element 400 is of a reflective type. The display element 400 emits the first sub-beam and the second sub-beam. The first sub-beam and the second sub-beam are incident on the projection lens at the same incident angle. The lens pair in the projection lens converges the first sub-beam and the second sub-beam incident at the same incident angle, and the converged light passes through the aperture.
[0079] Combined with Figure 10 As shown, the present utility model further includes a projection system, which includes a projection device and a projection screen 800.
[0080] Specifically, the laser light source 100 emits lasers of different wavelengths. The light combining component 200 combines the lasers of different wavelengths. The combined laser includes a first sub-beam and a second sub-beam. The first sub-beam and the second sub-beam are incident on the diffractive optical element 600. The first sub-beam and the second sub-beam emitted by the diffractive light source element 600 enter the first focusing lens 301. The first sub-beam and the second sub-beam emitted after being converged by the first focusing lens 301 have at least partially the same exit angle, and then enter the second focusing lens 302. The first sub-beam and the second sub-beam emitted by the second focusing lens 302 are incident on the prism assembly 700. The prism assembly 700 reflects them. The reflected first sub-beam and second sub-beam are incident on the display element 400. The display element 400 emits the first sub-beam and the second sub-beam. The first sub-beam and the second sub-beam are incident on the projection screen 800 of the projection lens at the same incident angle. The lenses in the projection lens 600 converge the first sub-beam and the second sub-beam incident at the same incident angle. The converged light passes through the aperture. The light passing through the aperture forms a projection image, and the projection image is projected and displayed on the projection screen 800.
[0081] A projection system provided by an embodiment of the present utility model is provided with a first focusing lens and a second focusing lens between the light combining component and the display element, so that the first sub-beam and the second sub-beam emitted by the second focusing lens enter the aperture at the same incident angle through the display element, increasing the number of rays that meet the incident requirements of the projection lens and improving the beam utilization rate. At the same time, a diffractive optical element is provided between the light combining component and the focusing lens to optically shape and homogenize the laser beam, so that the spot emitted by the diffractive optical element forms a specified shape with uniform energy; in addition, a beam splitting prism is added in front of the projection lens, which can separate the illumination beam and the imaging beam to form a color image.
[0082] In this document, relational terms such as "first" and "second" are used solely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.
[0083] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.
Claims
1. A projection device, characterized in that: include: A laser light source, used to emit lasers of different wavelengths; A light combining component, located at the light emitting side of the laser light source, for combining laser lights of different colors emitted by the laser light source; A focusing lens group, located at the light-emitting side of the light-combining component, for focusing the laser beam emitted by the light-combining component; A display element, located at the light-emitting side of the focusing lens group, and configured to modulate the incident laser light according to driving data of an image to be displayed to form a display image; A projection lens, located at the light-emitting side of the display element, for projecting the emitted light of the display element into an image; In which, the focusing lens group includes a first focusing lens and a second focusing lens which are arranged in sequence along the propagation direction of the laser beam emitted by the light combining component, the laser beam emitted by the light combining component includes a first sub-beam and a second sub-beam arranged in a direction perpendicular to the propagation direction of the laser beam, the first sub-beam and the second sub-beam are incident on the first focusing lens at the same incident angle, the emission angles of the first sub-beam and the second sub-beam emitted after being converged by the first focusing lens are at least partially the same, the converged first sub-beam and the second sub-beam are incident on the second focusing lens, and the first sub-beam and the second sub-beam emitted after being converged by the second focusing lens are incident on the display element at the same incident angle.
2. The projection device according to claim 1, characterized in that: The focal length of the first focusing lens includes a first focal length, the focal length of the second focusing lens includes a second focal length, and a ratio of the first focal length to the second focal length is greater than 1.
5.
3. The projection device according to claim 1 or 2, characterized in that: The projection device also includes: The diffractive optical element is located between the light combining component and the focusing lens group, and the imaging surface of the diffractive optical element is located at the light incident surface of the display element.
4. The projection device according to claim 3, characterized in that: The laser light source comprises a plurality of first laser chips, second laser chips and third laser chips arranged in an array; the wavelengths of lasers emitted by the first laser chip, the second laser chip and the third laser chip are different; The light combining component includes a first light combining mirror, a second light combining mirror and a third light combining mirror; the first light combining mirror is used to reflect the laser emitted by the first laser chip to the second light combining mirror; the second light combining mirror is used to transmit the laser emitted by the first laser chip and reflect the laser emitted by the second laser chip; the third light combining mirror is used to transmit the lasers emitted by the first laser chip and the second laser chip, and reflect the laser emitted by the third laser chip.
5. The projection device according to claim 4, characterized in that: The diffraction optical element includes a first diffraction layer and a second diffraction layer stacked along the propagation direction of the laser light beam emitted by the light combining component; the first diffraction layer diffracts the lasers emitted by the first laser chip and the second laser chip, and transmits the lasers emitted by the third laser chip; the second diffraction layer transmits the lasers emitted by the first laser chip and the second laser chip, and diffracts the lasers emitted by the third laser chip.
6. The projection device according to claim 4, characterized in that: The diffraction optical element includes a first diffraction layer, a second diffraction layer, and a third diffraction layer which are stacked along the propagation direction of the laser light beam emitted by the light combining component; the first diffraction layer diffracts the laser light emitted by the first laser chip, and transmits the laser light emitted by the second laser chip and the third laser chip; the second diffraction layer transmits the laser light emitted by the first laser chip and the third laser chip, and diffracts the laser light emitted by the second laser chip; the third diffraction layer transmits the laser light emitted by the first laser chip and the second laser chip, and diffracts the laser light emitted by the third laser chip.
7. The projection device according to claim 5 or 6, characterized in that: The diffractive optical element is connected to a driving device, and the driving device is used to drive the diffractive optical element to vibrate along the fast axis direction and / or the slow axis direction of the laser light beam emitted by the light combining component.
8. The projection device according to claim 4, characterized in that: The first laser chip is used to emit green laser light, the second laser chip is used to emit blue laser light, and the third laser chip is used to emit red laser light.
9. The projection device according to claim 1, characterized in that: The projection device further includes: a prism assembly located between the display element and the projection lens; the prism assembly is used to reflect the laser emitted by the focusing lens group to the display element, and transmit the light modulated by the display element to the projection lens.
10. A projection system, characterized in that: include: A projection device, wherein the projection device is the projection device according to any one of claims 1 to 9; The projection screen is located at the light-emitting side of the projection device.