Laser projection display device

Abstract

The embodiment of the application provides a kind of laser projection display equipment, belong to display technical field, which includes optical element and adjusting mechanism;Adjusting mechanism includes fixed part, displacement adjustment component and first adjusting part, fixed part is connected with optical element;First adjusting part is rotationally connected with engine housing around first axis, and there is first limit surface and second limit surface between first adjusting part and fixed part, first limit surface and second limit surface are both part of spherical surface with axis on first axis;First adjusting part is provided with first push surface that intersects with first axis and is not perpendicular;The side of fixed part towards first adjusting part has two first abutments of equal length, and two first abutments are all in abutment with first push surface.The laser projection equipment improves the adjustment accuracy of adjusting mechanism, reduces the adjustment difficulty of optical element, reduces the assembly difficulty of optical engine, and improves the production efficiency of laser projection display equipment.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to display technology, and in particular, to a laser projection display device. BACKGROUND

[0002] The laser projection display device is a display device that uses laser as a light source and projects an image outward. An optical engine is a key component in the laser projection display device. The optical engine generally includes an engine housing, and a light source, an illumination system, a digital micromirror device (DMD), and a projection system located in the engine housing. Laser emitted by the light source is irradiated onto the DMD by the illumination system, and is modulated into an image by the DMD. The modulated image is projected outward by the projection system. During assembly of the optical engine, in order to ensure the accuracy of the optical path, the position of at least one optical element, such as a mirror, in the light source, the illumination system, and the projection system needs to be adjusted.

[0003] In related technologies, the optical engine is generally provided with an adjusting mechanism for adjusting the position of the optical element. The adjusting mechanism includes a fixing member, three adjusting bolts, and three compression springs. The fixing member is connected with the optical element, and the fixing member is provided with three threaded holes arranged in a right-angled triangle. The engine housing is provided with three through holes opposite to the three threaded holes. The three adjusting bolts are respectively arranged in the three through holes and are connected with the threaded holes of the fixing member. The three compression springs are respectively sleeved on the three adjusting bolts, and two ends of each compression spring are respectively connected with the fixing member and the engine housing. When adjusting the position of the optical element, at least one of the three adjusting bolts can be rotated to adjust the optical element in different degrees of freedom.

[0004] However, the adjusting precision of the above adjusting mechanism is low, which increases the difficulty of adjusting the position of the optical element, thereby increasing the assembly difficulty of the optical engine and reducing the production efficiency of the laser projection display device. SUMMARY

[0005] Embodiments of the present application provide a laser projection display device, which can solve the technical problem of low adjusting precision of the adjusting mechanism in related technologies, which increases the difficulty of adjusting the position of the optical element, thereby increasing the assembly difficulty of the optical engine and reducing the production efficiency of the laser projection display device.

[0006] An embodiment of the present application provides a laser projection display device, comprising an optical engine, which is configured to project an image outward, the optical engine comprising an engine housing, an optical element and an adjustment mechanism, the engine housing being configured with a receiving cavity; the optical element being located in the receiving cavity; the adjustment mechanism being connected to the optical element and being configured to adjust the position of the optical element; wherein the adjustment mechanism comprises a fixing member, a displacement adjustment component and a first adjustment member, the fixing member being connected to the optical element; the displacement adjustment component being configured to adjust the displacement of the fixing member and the optical element along a first axis; the first adjustment member being rotationally connected to the engine housing around the first axis and having contact with the fixing member The first limiting surface and the second limiting surface are both partial spherical surfaces with the axis center located on the first axis; the first adjusting member is provided with a first pushing surface that intersects with and is not perpendicular to the first axis; the fixing member has two first abutting portions of equal length on the side facing the first adjusting member, and the two first abutting portions abut against the first pushing surface; when the first adjusting member rotates relative to the shell and limits the fixing member and the optical element from rotating around the first axis, the first pushing surface pushes the two first abutting portions, and under the limiting action of the first limiting surface and the second limiting surface, the fixing member and the optical element rotate around a second axis that is perpendicular to and intersects the first axis.

[0007] A laser projection display device according to an embodiment of the present application comprises a first adjustment member disposed between an engine housing and a fixed member connected to an optical element. The first adjustment member is rotatably connected to the engine housing about a first axis. A first limiting surface and a second limiting surface are provided between the first adjustment member and the fixed member, each of which is a partially spherical surface with a center located on the first axis. Furthermore, a first pushing surface intersecting and not perpendicular to the first axis, and two first abutting posts abutting the first pushing surface are provided between the first adjustment member and the second adjustment member. When the first adjustment member is rotated to restrict rotation of the fixed member about the first axis, the first pushing surface pushes the two first abutting portions, causing the second limiting surface to rotate relative to the first limiting surface, thereby rotating the fixed member and the optical element about a second axis perpendicular to and intersecting the first axis. Because the second axis intersects the first axis, adjusting the displacement of the fixed member and the optical element along the first axis does not affect the rotation angle of the fixed member and the optical element about the second axis, thereby improving the adjustment accuracy of the adjustment mechanism, reducing the difficulty of adjusting the optical element, and simplifying the assembly of the optical engine, thereby improving the production efficiency of the laser projection display device.

[0008] In some embodiments of the present application, the first adjusting member is located between a side wall of the engine housing and the fixing member, the first adjusting member is provided with a first groove or a first protrusion on a side facing the fixing member, and the first groove or the first protrusion is provided with the first limiting surface on a circumferential side around the first axis; the first pushing surface is provided at the bottom of the first groove or the end of the first protrusion; the fixing member has a first protrusion accommodated in the first groove or a first groove sleeved on the first protrusion on a side facing the first adjusting member, and the first protrusion or the first groove is provided with a second limiting surface on a circumferential side in contact with the first limiting surface; the end of the first protrusion or the bottom of the first groove is provided with two first abutting portions, and the two first abutting portions are respectively located on both sides of the first axis;

[0009] In this configuration, a first adjusting member is rotatably connected to the sidewall of the engine housing about a first axis. A first recess is disposed between the first adjusting member and the fixed member, and a first protrusion is received within the first recess. A first limiting surface and a second limiting surface are disposed between the first recess and the first protrusion, each of which is a partial spherical surface with its center on the first axis. A first pushing surface is disposed at the bottom of the first recess or at the end of the first protrusion of the first adjusting member, intersecting and non-perpendicular to the first axis. Two first abutting portions of equal length are disposed at the end of the first protrusion or at the bottom of the first recess on the side of the fixed member facing the first adjusting member. The two first abutting portions are located on either side of the first axis and abut against the first pushing surface. When a rotational force is applied to the first adjusting member and the fixed member is restrained from rotating about the first axis, the first pushing surface of the first adjusting member rotates relative to the first axis and pushes the two first abutting portions, causing the distance between one of the first abutting portions and the sidewall to decrease and the distance between the other first abutting portion and the sidewall to increase, thereby causing the fixed member and the optical element to rotate about a second axis perpendicular to the first axis. Furthermore, due to the limiting action between the first and second limiting surfaces, the second axis passes through the center of the sphere located on the first axis, thereby intersecting the first axis. This ensures that when the displacement of the fixing member and the optical element along the first axis is adjusted, the rotation angle of the fixing member and the optical element about the second axis is not affected, thereby improving the adjustment accuracy of the adjustment mechanism, reducing the difficulty of adjusting the optical element, and reducing the difficulty of assembling the optical engine, thereby improving the production efficiency of the laser projection display device.

[0010] In some embodiments of the present application, the adjustment mechanism further includes a second adjustment member, the second adjustment member being located between the first adjustment member and the fixing member, the first protrusion or the first groove being provided on a side of the second adjustment member facing the first adjustment member; a second groove or a second protrusion being provided on a side of the second adjustment member facing the fixing member, a third limiting surface being provided on a circumferential side of the second groove or the second protrusion around the first axis; a second pushing surface being provided at the bottom of the second groove or at the end of the second protrusion, the second pushing surface being rotated 90° around the first axis relative to the first pushing surface;

[0011] The fixing member has a second protrusion received in the second groove or a second groove sleeved on the second protrusion on a side facing the second adjusting member; a fourth limiting surface in contact with the third limiting surface is provided on a circumferential side of the second protrusion or the second groove; the third limiting surface and the fourth limiting surface are both second partial spherical surfaces with a center located on the first axis; two second abutting portions of equal length are provided at the end of the second protrusion or the bottom of the second groove, the two second abutting portions are respectively located on either side of the first axis and both abut against the second pushing surface;

[0012] When the first adjusting member and the second adjusting member are rotated synchronously and the fixing member is restricted from rotating around the first axis, the second pushing surface pushes the two second abutting portions, and the third limiting surface and the fourth limiting surface rotate relative to each other, so that the fixing member and the optical element rotate around a third axis that is perpendicular to and intersects with the first axis and is perpendicular to the second axis.

[0013] In this way, a matching first groove and a first protrusion are provided between the second adjustment member connected to the fixing member and the first adjustment member. When the first adjustment member is rotated, the rotation of the second adjustment member and the fixing member around the first axis is restricted to adjust the rotation angle of the optical element around the second axis.

[0014] Further, the second adjusting member and the fixing member are provided with a second groove and a second protrusion accommodated in the second groove, and the second groove and the second protrusion have a third limiting surface and a fourth limiting surface in contact with each other, and the third limiting surface and the fourth limiting surface are both second partial spherical surfaces with a spherical center on the first axis. The second groove of the second adjusting member or the end of the second protrusion is provided with a second pushing surface intersecting the first axis and not perpendicular to the first axis, and the end of the second protrusion of the fixing member or the bottom of the second groove is provided with two second abutting portions with the same length, and the two second abutting portions are respectively located on both sides of the first axis and are in abutment with the second pushing surface. When a rotating force is synchronously applied to the first adjusting member and the second adjusting member and the rotation of the fixing member around the first axis is limited, the second pushing surface of the second adjusting member rotates relative to the first axis and pushes the two second abutting portions, so that the distance between one of the second abutting portions and the side wall decreases, and the distance between the other second abutting portion and the side wall increases, thereby causing the fixing member and the optical element to rotate around a third axis perpendicular to the first axis. And due to the limiting action between the third limiting surface and the fourth limiting surface, the third axis passes through the spherical center located on the first axis, so that the third axis intersects the first axis. And because the second pushing surface rotates 90° around the first axis relative to the first pushing surface, the third axis is perpendicular to the second axis. In this way, the adjustment of the displacement of the fixing member and the optical element along the first axis will not affect the rotation angle of the fixing member and the optical element around the third axis, thereby further improving the adjustment accuracy of the adjusting mechanism, reducing the adjustment difficulty of the optical element, reducing the assembly difficulty of the optical engine, and improving the production efficiency of the laser projection display device.

[0015] In some embodiments of the present application, the first adjusting member is provided with the first groove on the side facing the fixing member, and the circumferential side of the first groove is provided with a first limiting notch facing the second adjusting member; and the second adjusting member is provided with the first protrusion on the side facing the first adjusting member, and the circumferential side of the first protrusion is provided with a first limiting protruding portion which is arranged in the first limiting notch.

[0016] In this way, during the relative rotation of the first adjusting member and the second adjusting member caused by the first pushing surface pushing the first abutting portion, the first limiting notch can limit the first limiting protruding portion to limit the rotation range of the second adjusting member, thereby limiting the rotation angle of the optical element around the second axis, and further preventing the position of the optical element from deviating too much.

[0017] Further, the first limiting protruding portion is arranged in the first limiting notch, and the second adjusting member can be rotated or limited by the first limiting protruding portion, thereby improving the convenience of operating the second adjusting member.

[0018] In some embodiments of the present application, the second adjusting member is provided with the second groove on the side facing the fixing member, and the circumferential side of the second groove is provided with a second limiting notch facing the fixing member; the fixing member is provided with the second protrusion on the side facing the second adjusting member, and the circumferential side of the second protrusion is provided with a second limiting protrusion, and the second limiting protrusion is provided in the second limiting notch.

[0019] In this way, when the second pushing surface pushes the second abutment portion, so that the second adjusting member and the fixing member rotate relative to each other, the second limiting notch can limit the second limiting protrusion to limit the rotation range of the fixing member, thereby limiting the rotation angle of the optical element around the third axis, thereby preventing the position of the optical element from deviating too much.

[0020] Furthermore, the second limiting protrusion is disposed within the second limiting notch, and can also be used to limit the fixing member. The second limiting protrusion can also be used to adjust the position of the fixing member during assembly of the adjustment mechanism, so that the fixing member is in the initial position, thereby improving the convenience of operating the fixing member.

[0021] In some embodiments of the present application, one of the first adjustment member and the side wall is provided with a cylindrical connecting protrusion, the axis of the cylindrical connecting protrusion is the first axis; the other is provided with an annular connecting groove, and the annular connecting groove is sleeved on the cylindrical connecting protrusion.

[0022] With such an arrangement, the first adjustment member and the side wall of the engine housing are connected in rotation around the first axis through the cylindrical connecting protrusions and the annular connecting grooves that are socketed with each other, so that the connection structure between the first adjustment member and the engine housing is relatively simple, reducing the difficulty of installation and adjustment between the first adjustment member and the engine housing.

[0023] In some embodiments of the present application, a first operating portion is provided on the outer side of the first adjusting member, and the first adjusting member is rotated by the first operating portion.

[0024] Such an arrangement improves the convenience of rotating the first adjusting member, thereby increasing the difficulty of adjusting the optical element.

[0025] In some embodiments of the present application, the side wall is provided with a first through hole, the axis of the first through hole coincides with the first axis; the first adjusting member is provided with a second through hole, the second through hole being opposite to the first through hole; the second adjusting member is provided with a third through hole, the third through hole being opposite to the second through hole; a threaded hole is provided on the side of the fixing member facing the second adjusting member; the adjustment mechanism further includes an adjusting bolt and a compression elastic member, the adjusting bolt is sequentially passed through the first through hole, the second through hole and the third through hole, and connected to the threaded hole; the compression elastic member is located between the first adjusting member and the side wall, the two ends of the compression elastic member respectively abut against the side wall and the first adjusting member, and applies a thrust to the side wall and the first adjusting member so that the end cap of the adjusting bolt abuts against the side wall, and the first adjusting member, the second adjusting member and the fixing member abut against each other; wherein, when the adjusting bolt is rotated, the fixing member moves along the first axis under the thrust of the compression elastic member.

[0026] With this arrangement, the axes of the adjustment bolts, which are sequentially inserted through the first, second, and third through-holes, can coincide with the first axis and are threadedly connected to the fixing member. The compressed elastic member applies a thrust to the first adjustment member and the sidewall of the engine housing, causing the first and second adjustment members to abut against the fixing member, and the end caps of the adjustment bolts to abut against the sidewall. Rotating the adjustment bolts causes the fixing member and the optical element connected thereto to move along the first axis, thereby adjusting the displacement of the optical element along the first axis.

[0027] In some embodiments of the present application, a rotation limiting portion is provided on the bottom surface of the engine housing adjacent to the side wall, and the rotation limiting portion abuts against the fixing member on the side facing away from the bottom surface, and the rotation limiting portion limits the rotation of the fixing member around the first axis.

[0028] With such a configuration, the rotation limit portion can limit the rotation of the fixing member around the first axis, so that during the adjustment of the optical element, there is no need to manually limit the rotation of the fixing member and the optical element around the first axis, thereby improving the convenience and adjustment accuracy when adjusting the position of the fixing member and the optical element.

[0029] In some embodiments of the present application, the engine housing is provided with an adjustment through hole, the adjustment through hole is opposite to the adjustment mechanism, and a packaging sheet is provided on the upper cover of the adjustment through hole.

[0030] With this arrangement, after the optical engine is assembled, the encapsulation sheet can be removed to adjust the adjustment mechanism again through the adjustment holes. For example, after the optical engine is turned on, the adjustment mechanism can be used to adjust the position of the optical components again based on the image projected by the optical engine to improve the image quality of the optical engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the implementation methods in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0032] Figure 1 Schematic diagram of the structure of the adjustment mechanism in the related technology Figure 1 ;

[0033] Figure 2 for Figure 1 Schematic diagram of the structure of the adjustment mechanism Figure 2 ;

[0034] Figure 3 This is a schematic structural diagram of the optical engine in the first embodiment of the present application;

[0035] Figure 4 for Figure 3 Schematic diagram of the explosion structure of the optical engine;

[0036] Figure 5 Some possible implementations of the first embodiment of this application Figure 4 A partial enlarged schematic diagram of point A in the middle;

[0037] Figure 6 for Figure 5 Schematic diagram of the three-dimensional structure of the adjustment mechanism;

[0038] Figure 7 for Figure 6 First-person exploded structural diagram of the adjustment mechanism;

[0039] Figure 8 for Figure 7 Schematic diagram of the exploded structure of the adjustment mechanism from the second perspective;

[0040] Figure 9 for Figure 5 Schematic diagram of the front view of the adjustment mechanism;

[0041] Figure 10 for Figure 9 Schematic diagram of the cross-sectional structure along the middle BB direction;

[0042] Figure 11 This is a partial enlarged schematic diagram of point A in some other possible implementations of the first embodiment of the present application;

[0043] Figure 12 for Figure 11 Schematic diagram of the three-dimensional structure of the adjustment mechanism;

[0044] Figure 13 for Figure 12 First-person exploded structural diagram of the adjustment mechanism;

[0045] Figure 14 for Figure 12 Schematic diagram of the exploded structure of the adjustment mechanism from the second perspective;

[0046] Figure 15 for Figure 11 Schematic diagram of the front view of the adjustment mechanism;

[0047] Figure 16 for Figure 15 Schematic diagram of the cross-sectional structure in the CC direction;

[0048] Figure 17 for Figure 11 Schematic diagram of the three-dimensional structure of the fixing parts Figure 1 ;

[0049] Figure 18 for Figure 17 Schematic diagram of the three-dimensional structure of the fixing parts Figure 2 ;

[0050] Figure 19 for Figure 11 Schematic diagram of the three-dimensional structure of the first adjusting member Figure 1 ;

[0051] Figure 20 for Figure 19 Schematic diagram of the three-dimensional structure of the first adjusting member Figure 2 ;

[0052] Figure 21 for Figure 11 Schematic diagram of the three-dimensional structure of the second adjusting member Figure 1 ;

[0053] Figure 22 for Figure 21 Schematic diagram of the three-dimensional structure of the second adjusting member Figure 2 ;

[0054] Figure 23 This is a structural diagram of the adjustment mechanism in the second embodiment of the present application;

[0055] Figure 24 for Figure 23 Schematic diagram of the front view of the adjustment mechanism;

[0056] Figure 25 for Figure 24 Schematic diagram of the cross-sectional structure in the middle DD direction.

[0057] Description of the accompanying drawings:

[0058] 100-engine housing;

[0059] 110- bottom shell; 111- side wall;

[0060] 112- cylindrical connecting protrusion; 113- receiving groove;

[0061] 114 - first through hole; 120 - cover plate;

[0062] 121-adjusting through hole; 122-packaging sheet;

[0063] 130-rotation limiting portion;

[0064] 200-reflector;

[0065] 300-adjustment mechanism;

[0066] 310-fixing member; 311-fixing portion;

[0067] 312-mounting slot; 313-adjustment portion;

[0068] 314 - second protrusion; 315 - fourth limiting surface;

[0069] 316-second abutting portion; 317-second limiting protrusion;

[0070] 318-threaded hole; 320-displacement adjustment assembly;

[0071] 321-adjusting bolt; 322-compression elastic member;

[0072] 330-first adjustment member; 331-cylindrical connecting groove;

[0073] 332-first groove; 333-first limiting surface;

[0074] 334-first pushing surface; 335-first operating portion;

[0075] 336-first limiting notch; 337-second through hole;

[0076] 340 - second adjustment member; 341 - first protrusion;

[0077] 342-second limiting surface; 343-first abutting portion;

[0078] 344-second groove; 345-third limiting surface;

[0079] 346 - second pushing surface; 347 - first limiting protrusion;

[0080] 348 - second limiting notch; 349 - third through hole. DETAILED DESCRIPTION

[0081] refer to Figure 1 and Figure 2 In the related art, the adjustment mechanism usually includes a fixing member 110', three adjustment bolts 120' and three compression springs 130'. The fixing member 110' is located in the engine housing 100', and the optical element 140' to be adjusted is fixedly connected to the fixing member 110'. Three connecting posts 111' are provided on the side of the fixing member 110' facing the engine housing 100'. The three connecting posts 111' are arranged in a right triangle, that is, the line connecting the center lines of the three connecting posts 111' forms a right triangle. One right-angled side of the right triangle is arranged in the m direction, and the other right-angled side of the right triangle is arranged in the n direction. Each connecting post 111' is provided with a threaded hole 112'. The engine housing 100' is provided with three through holes corresponding to the three connecting posts 111'. The three adjustment bolts 120' are respectively inserted into the three through holes, and the threaded end of each adjustment bolt 120' is connected to the threaded hole 112'. Three compression springs 130' are respectively mounted on three connected adjustment bolts 120' and connecting columns 111'. Two ends of each compression spring 130' respectively abut against the fixing member 110' and the engine housing 100' to apply thrust to the fixing member 110' and the engine housing 100'.

[0082] When a certain adjustment bolt 120' is rotated, the compression spring 130' applies thrust to the fixing member 110' and the engine housing 100', causing the connecting column 111' threadedly connected to the adjustment bolt 120' to move relative to the engine housing 100' along the axial direction of the adjustment bolt 120'. By rotating different adjustment bolts 120', the relative distances between the three connecting columns 111' and the engine housing 100' can be adjusted, thereby adjusting the optical element 140' with different degrees of freedom. For example, referring to Figure 2 Rotating the left adjustment bolt 120' adjusts the angle of optical element 140' about the n direction. Rotating the upper right adjustment bolt 120' adjusts the angle of optical element 140' about the m direction. Rotating all three adjustment bolts 120' in the same direction and amount adjusts the displacement of optical element 140' along the l direction.

[0083] However, the adjustment mechanism in the related art has low adjustment accuracy, which increases the difficulty of adjusting the position of the optical element, thereby increasing the difficulty of assembling the optical engine and reducing the production efficiency of the laser projection display device. The inventors have discovered that the reason for this is that when rotating the adjustment bolt 120' to adjust a certain degree of freedom of the optical element 140' to be adjusted, it usually affects the other degrees of freedom of the fixing member 110' and the optical element 140' to be adjusted. In particular, when adjusting the displacement of the optical element 140' along the l direction, it is difficult to avoid affecting the angle of the optical element 140' around the m direction and the angle around the n direction. This increases the position uncertainty of the optical element 140', thereby increasing the difficulty of adjusting the position of the optical element 140', further increasing the difficulty of assembling the optical engine and reducing the production efficiency of the laser projection display device.

[0084] In view of this, the adjustment mechanism in the laser projection display device of the embodiment of the present application is provided by setting a first adjustment member between the engine housing and the fixing member connected to the optical element. The first adjustment member is connected to the engine housing for rotation around the first axis. A first limiting surface and a second limiting surface are provided between the first adjustment member and the fixing member, and the first limiting surface and the second limiting surface are both first partial spherical surfaces with the center of the sphere located on the first axis. A first pushing surface that intersects with and is not perpendicular to the first axis, and two first abutting columns that abut against the first pushing surface are also provided between the first adjustment member and the second adjustment member. When the first adjustment member is rotated and the fixing member is restricted from rotating around the first axis, the first pushing surface pushes the two first abutting portions, and the second limiting surface rotates relative to the first limiting surface, so that the fixing member and the optical element rotate around the second axis that is perpendicular to and intersects the first axis. Since the second axis intersects with the first axis, when adjusting the displacement of the fixing member and the optical element along the first axis, it will not affect the rotation angle of the fixing member and the optical element around the second axis, thereby improving the adjustment accuracy of the adjustment mechanism, reducing the adjustment difficulty of the optical element, reducing the assembly difficulty of the optical engine, and improving the production efficiency of the laser projection display device.

[0085] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0086] It should be noted that the brief descriptions of terms in this application are only for the purpose of facilitating the understanding of the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and usual meanings.

[0087] In addition, the terms "comprises" and "comprising" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0088] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0089] The terms "first," "second," "third," "fourth," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature identified with "first," "second," "third," "fourth," etc., may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0090] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0091] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0092] First embodiment

[0093] The first embodiment of the present application provides a laser projection display device. The laser projection display device includes an optical engine, which is configured to project an image outward. Exemplarily, the optical engine may include an engine housing, a light source, an illumination system, a digital micromirror device (DMD) and a projection system. The engine housing is configured with a housing cavity, and the light source, illumination system, DMD and projection system are located in the housing cavity. Exemplarily, referring to Figure 3 and Figure 4 The engine housing 100 may be a split structure, for example, comprising a detachably connected bottom housing 110 and a cover 120, with the cover 120 and bottom housing 110 forming a housing cavity. The light source, illumination system, and projection system may include multiple optical components. Laser light emitted by the light source is irradiated by the illumination system onto the DMD, where it is modulated into an image. The modulated image is then projected outward via the projection system for viewing by the user.

[0094] refer to Figure 4 and Figure 5 The laser projection display device of the embodiment of the present application also includes an adjustment mechanism 300, which is connected to the optical element and is used to adjust the position of the optical element. The multiple optical elements usually include a reflector 200, and the reflector 200 uses the law of reflection of light to change the propagation direction of the laser. The relative angle between the reflector 200 and the light source determines the reflection angle of the laser. Therefore, the position accuracy of the reflector 200 has a great influence on the accuracy of the light path in the optical engine. The technical solution of the adjustment mechanism 300 is explained below by taking the optical element as the reflector 200 as an example. It can be understood that the optical element can also be other optical elements, such as a prism, etc., which will not be described in detail in the embodiment of the present application.

[0095] refer to Figures 6 to 16The adjustment mechanism 300 may include a fixing member 310, a displacement adjustment assembly 320 and a first adjustment member 330, and the fixing member 310 is connected to the reflector 200. The displacement adjustment assembly 320 is configured to adjust the displacement of the fixing member 310 and the reflector 200 along the first axis x. The first adjustment member 330 is rotatably connected to the engine housing 100 around the first axis x, and has a first limiting surface 333 and a second limiting surface 342 in contact with the fixing member 310. The first limiting surface 333 and the second limiting surface 342 are both partial spherical surfaces whose axes are located on the first axis x. The first adjustment member 330 is provided with a first pushing surface 334 that intersects with the first axis x and is not perpendicular to it. The fixing member 310 has two first abutting portions 343 of equal length on one side facing the first adjustment member 330, and the two first abutting portions 343 are both in contact with the first pushing surface 334. When the first adjusting member 330 rotates relative to the shell and limits the fixing member 310 and the reflector 200 from rotating around the first axis x, the first pushing surface 334 pushes the two first abutting portions 343, and under the limiting action of the first limiting surface 333 and the second limiting surface 342, the fixing member 310 and the reflector 200 rotate around the second axis y that is perpendicular to and intersects the first axis x.

[0096] The laser projection display device of the present embodiment comprises a first adjusting member 330 disposed between the engine housing 100 and the fixing member 310 connected to the reflector 200. The first adjusting member 330 is rotatably connected to the engine housing 100 about a first axis x. A first limiting surface 333 and a second limiting surface 342 are provided between the first adjusting member 330 and the fixing member 310, each of which contacts a portion of a sphere with its center located on the first axis x. Furthermore, a first pushing surface 334, which intersects and is not perpendicular to the first axis x, and two first abutting posts abutting the first pushing surface 334 are provided between the first adjusting member 330 and the second adjusting member 340. When the first adjusting member 330 is rotated to restrict the fixing member 310 from rotating about the first axis x, the first pushing surface 334 pushes the two first abutting portions 343, causing the second limiting surface 342 to rotate relative to the first limiting surface 333, thereby causing the fixing member 310 and the reflector 200 to rotate about a second axis y, which is perpendicular to and intersects the first axis x. Since the second axis y intersects the first axis x, when adjusting the displacement of the fixing member 310 and the reflector 200 along the first axis x, it will not affect the rotation angle of the fixing member 310 and the reflector 200 around the second axis y, thereby improving the adjustment accuracy of the adjustment mechanism 300, reducing the adjustment difficulty of the reflector 200, reducing the assembly difficulty of the optical engine, and improving the production efficiency of the laser projection display device.

[0097] The fixing member 310 is used to connect the reflector 200. For example, continue to refer to Figure 17 and Figure 18The fixing member 310 may include a fixed portion 311 and an adjustment portion 313 connected to each other. The fixing portion 311 may be provided with a mounting groove 312, and the reflector 200 is mounted in the mounting groove 312. For example, the reflector 200 may be fixed in the mounting groove 312 by dispensing glue or using a spring clip. The adjustment portion 313 is used to cooperate with the first adjustment member 330 and the displacement adjustment assembly 320 to adjust the position of the fixing member 310 and the reflector 200.

[0098] The first adjustment member 330 is located between the side wall 111 of the engine housing 100 and the fixing member 310, and is rotatably connected to the side wall 111 around the first axis x. For example, one of the first adjustment member 330 and the side wall 111 is provided with a cylindrical connecting protrusion 112, and the axis of the cylindrical connecting protrusion 112 is the first axis x. The other is provided with a circular connecting groove, and the circular connecting groove is sleeved on the cylindrical connecting protrusion 112. For example, referring to Figure 7 、 Figure 8 、 Figure 10 ,as well as Figure 13 、 Figure 14 , and refer to Figure 19 and Figure 20 The side wall 111 may be provided with a cylindrical connecting protrusion 112, the axis of which is the first axis x. The first adjustment member 330 is provided with a cylindrical connecting groove 331 that is sleeved onto the cylindrical connecting protrusion 112. The first adjustment member 330 and the side wall 111 of the engine housing 100 are connected to each other through the sleeved cylindrical connecting protrusion 112 and the annular connecting groove to achieve a rotational connection about the first axis x. This makes the connection structure between the first adjustment member 330 and the engine housing 100 relatively simple, reducing the difficulty of assembly and adjustment between the first adjustment member 330 and the engine housing 100.

[0099] The first adjusting member 330 may be provided with a first groove 332 on one side facing the fixing member 310, and a first limiting surface 333 may be provided on the circumferential side of the first groove 332 around the first axis x. A first pushing surface 334 is provided at the bottom of the first groove 332, and the first pushing surface 334 intersects with the first axis x and is not perpendicular to it. Figure 19 As shown, the first pushing surface 334 may be inclined at the left and right sides relative to a plane perpendicular to the first axis x.

[0100] The fixing member 310 has a first protrusion 341 on one side facing the first adjusting member 330 and received in the first groove 332. For example, in some possible implementations of the present application, referring to Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10The first protrusion 341 can be arranged on the fixing member 310 and located on the adjusting portion 313 of the fixing member 310 facing the first adjusting member 330. The circumferential side of the first protrusion 341 is provided with a second limiting surface 342 in contact with the first limiting surface 333. The second limiting surface 342 and the first limiting surface 333 can both be first partial spherical surfaces, and the center S1 of the first partial spherical surfaces is located on the first axis x. The end of the first protrusion 341 can be provided with two first abutting portions 343 of equal length, and the two first abutting portions 343 are respectively located on both sides of the first axis x and are both in abutment with the first pushing surface 334. When the first adjusting member 330 is rotated and the rotation of the fixing member 310 around the first axis x is limited, the first pushing surface 334 pushes the two first abutting portions 343, and the second limiting surface 342 rotates relative to the first limiting surface 333, so that the fixing member 310 and the reflector 200 rotate around the second axis y perpendicular to and intersecting the first axis x.

[0101] When a rotating force is applied to the first adjusting member 330 and the rotation of the fixing member 310 around the first axis x is limited, the first pushing surface 334 of the first adjusting member 330 rotates relative to the first axis x and pushes the two first abutting portions 343, so that the distance between one of the first abutting portions 343 and the side wall 111 decreases, and the distance between the other first abutting portion 343 and the side wall 111 increases, thereby causing the fixing member 310 and the reflector 200 to rotate around the second axis y perpendicular to the first axis x. In this way, the adjusting mechanism 300 can realize two degrees of freedom adjustment of the reflector 200, i.e., displacement along the first axis x and angle of rotation around the second axis y.

[0102] Due to the limiting action between the first limiting surface 333 and the second limiting surface 342, the second axis y passes through the center located on the first axis x, so that the second axis y intersects the first axis x, which can prevent the adjustment of the displacement of the fixing member 310 and the reflector 200 along the first axis x from affecting the rotation angle of the fixing member 310 and the reflector 200 around the second axis y, thereby improving the adjustment accuracy of the adjusting mechanism 300, reducing the adjustment difficulty of the reflector 200, reducing the assembly difficulty of the optical engine, and improving the production efficiency of the laser projection display device.

[0103] In some possible implementation manners of the embodiments of the present application, reference can be made to Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 and Figure 16The adjustment mechanism 300 may further include a second adjustment member 340, which is located between the first adjustment member 330 and the fixing member 310. In other words, the second adjustment member 340 is located on the side of the fixing member 310 facing the first adjustment member 330. A first protrusion 341 may be provided on the second adjustment member 340 and located at one end of the second adjustment member 340 facing the first adjustment member 330. A first groove 332 and a first protrusion 341 are provided between the first adjustment member 330 and the second adjustment member 340 connected to the fixing member 310, and when the first adjustment member 330 is rotated and the rotation of the second adjustment member 340 and the fixing member 310 around the first axis x is restricted, the rotation angle of the reflector 200 around the second axis y can be adjusted. This embodiment of the present application will not be described in detail.

[0104] The side of the second adjusting member 340 facing away from the first adjusting member 330 can be connected to the fixing member 310. For example, a second groove 344 is provided on the side of the second adjusting member 340 facing the fixing member 310, and a third limiting surface 345 is provided on the circumferential side of the second groove 344 around the first axis x. A second pushing surface 346 is provided at the bottom of the second groove 344, and the second pushing surface 346 rotates 90° around the first axis x relative to the first pushing surface 334. The fixing member 310 has a second protrusion 314 accommodated in the second groove 344 on the side facing the second adjusting member 340, and a fourth limiting surface 315 is provided on the circumferential side of the second protrusion 314, which contacts the third limiting surface 345. The third limiting surface 345 and the fourth limiting surface 315 are both second partial spherical surfaces, and the center S2 of the second partial spherical surface is located on the first axis x. Two second abutting portions 316 of equal length are provided at the end of the second protrusion 314. The two second abutting portions 316 are located on either side of the first axis x and abut against the second pushing surface 346. When the first adjusting member 330 and the second adjusting member 340 are rotated synchronously to restrict the fixed member 310 from rotating about the first axis x, the second pushing surface 346 pushes the two second abutting portions 316, causing the third limiting surface 345 and the fourth limiting surface 315 to rotate relative to each other, thereby allowing the fixed member 310 and the reflector 200 to rotate about a third axis z that is perpendicular to and intersects the first axis x and is perpendicular to the second axis y.

[0105] The second adjusting member 340 and the fixing member 310 are provided with a second groove 344 and a second protrusion 314 accommodated in the second groove 344, and the second groove 344 and the second protrusion 314 have a third limiting surface 345 and a fourth limiting surface 315 in contact, both of which are second partial spherical surfaces with the spherical center on the first axis x. The bottom of the second groove 344 of the second adjusting member 340 is provided with a second pushing surface 346 intersecting the first axis x and not perpendicular to the first axis x, and the end of the second protrusion 314 of the fixing member 310 is provided with two second abutting portions 316 of equal length, both of which are located on both sides of the first axis x and are in abutment with the second pushing surface 346. When a rotating force is synchronously applied to the first adjusting member 330 and the second adjusting member 340 and the rotation of the fixing member 310 around the first axis x is limited, the second pushing surface 346 of the second adjusting member 340 rotates relative to the first axis x and pushes the two second abutting portions 316, so that the distance between one of the second abutting portions 316 and the side wall 111 decreases, and the distance between the other second abutting portion 316 and the side wall 111 increases, thereby causing the fixing member 310 and the mirror 200 to rotate around a third axis z perpendicular to the first axis x. And because the second pushing surface 346 rotates 90° around the first axis x relative to the first pushing surface 334, the third axis z is perpendicular to the second axis y. In this way, the adjustment mechanism 300 can realize three degrees of freedom adjustment of the mirror 200, i.e. displacement along the first axis x, angle around the second axis y, and angle around the third axis z.

[0106] In addition, due to the limiting action between the third limiting surface 345 and the fourth limiting surface 315, the third axis z passes through the spherical center on the first axis x, so that the third axis z intersects the first axis x. In this way, the rotation angle of the fixing member 310 and the mirror 200 around the third axis z will not be affected when adjusting the displacement of the fixing member 310 and the mirror 200 along the first axis x, thereby further improving the adjustment accuracy of the adjustment mechanism 300, reducing the adjustment difficulty of the mirror 200, reducing the assembly difficulty of the optical engine, and improving the production efficiency of the laser projection display device.

[0107] For example, and with reference to Figure 19 and Figure 20 The outer side of the first adjusting member 330 can be provided with a first operating portion 335 for rotating the first adjusting member 330. In this way, the convenience of rotating the first adjusting member 330 is improved, thereby improving the adjustment difficulty of adjusting the mirror 200. For example, and with reference to Figure 21 and Figure 22The first adjusting member 330 is provided with a first groove 332 on a side facing the fixing member 310. A first limiting notch 336 facing the second adjusting member 340 may be provided on a circumferential side of the first groove 332. The second adjusting member 340 is provided with a first protrusion 341 on a side facing the first adjusting member 330. A first limiting protrusion 347 is provided on a circumferential side of the first protrusion 341. The first limiting protrusion 347 is inserted into the first limiting notch 336.

[0108] When the first pushing surface 334 pushes the first abutting portion 343, causing the first adjusting member 330 and the second adjusting member 340 to rotate relative to each other, the first limiting notch 336 can limit the first limiting protrusion 347, thereby limiting the rotation range of the second adjusting member 340, thereby limiting the angle of rotation of the reflector 200 about the second axis y, thereby preventing excessive position deviation of the reflector 200. In addition, the first limiting protrusion 347 is disposed within the first limiting notch 336, and can also be used to rotate or limit the second adjusting member 340, thereby improving the convenience of operating the second adjusting member 340.

[0109] For example, continue to refer to Figure 17 and Figure 18 A second groove 344 is provided on the side of the second adjusting member 340 facing the fixing member 310, and a second position-limiting notch 348 is provided on the circumferential side of the second groove 344 facing the fixing member 310. A second protrusion 314 is provided on the side of the fixing member 310 facing the second adjusting member 340, and a second position-limiting protrusion 317 is provided on the circumferential side of the second protrusion 314. The second position-limiting protrusion 317 is inserted into the second position-limiting notch 348.

[0110] When the second pushing surface 346 pushes the second abutting portion 316, causing the second adjusting member 340 and the fixing member 310 to rotate relative to each other, the second limiting notch 348 can limit the second limiting protrusion 317, thereby limiting the rotation range of the fixing member 310, thereby limiting the angle of rotation of the reflector 200 about the third axis z, and thus preventing the position of the reflector 200 from deviating too much. In addition, the second limiting protrusion 317 is disposed within the second limiting notch 348, and can also be used to limit the fixing member 310. The second limiting protrusion 317 can also be used to adjust the position of the fixing member 310 during assembly of the adjustment mechanism 300, so that the fixing member 310 is in the initial position, improving the convenience of operating the fixing member 310.

[0111] For example, refer to Figure 10 and Figure 16The side wall 111 of the engine housing 100 may also be provided with a first through hole 114, the axis of the first through hole 114 coincides with the first axis x. The first adjustment member 330 is provided with a second through hole 337, and the second through hole 337 is opposite to the first through hole 114. The second adjustment member 340 is provided with a third through hole 349, and the third through hole 349 is opposite to the second through hole 337. A threaded hole 318 is provided on the side of the fixing member 310 facing the second adjustment member 340. The adjustment mechanism 300 may include an adjustment bolt 321 and a compression elastic member 322, and the adjustment bolt 321 is sequentially passed through the first through hole 114, the second through hole 337 and the third through hole 349, and connected to the threaded hole 318. The compression elastic member 322 is located between the first adjustment member 330 and the sidewall 111. Its two ends abut the sidewall 111 and the first adjustment member 330, respectively, and apply a thrust to the sidewall 111 and the first adjustment member 330, thereby causing the end cap of the adjustment bolt 321 to abut against the sidewall 111 and forcing the first and second adjustment members 330, 340, and the fixed member 310 to abut against each other. For example, the cylindrical connecting protrusion 112 of the sidewall 111 facing the first adjustment member 330 may be provided with a receiving groove 113. The compression elastic member 322 may be a compression spring, which is accommodated in the receiving groove 113 and sleeved onto the adjustment bolt. One end of the compression spring abuts the bottom of the receiving groove 113, and the other end abuts the bottom of the cylindrical connecting groove 331. When the adjustment bolt 321 is rotated, the fixed member 310 moves along the first axis x under the thrust of the compression elastic member 322.

[0112] The axis of the adjustment bolt 321, which is sequentially inserted through the first through hole 114, the second through hole 337, and the third through hole 349, can coincide with the first axis x and is threadedly connected to the fixing member 310. The compression elastic member 322 applies a thrust to the first adjustment member 330 and the side wall 111 of the engine housing 100, causing the first adjustment member 330, the second adjustment member 340, and the fixing member 310 to abut against each other, and the end cap of the adjustment bolt 321 to abut against the side wall 111. Rotating the adjustment bolt 321 can cause the fixing member 310 and the reflector 200 connected to the fixing member 310 to move along the first axis x, thereby adjusting the displacement of the reflector 200 along the first axis x.

[0113] For example, refer to Figure 5 and Figure 11A rotation limiter 130 may be provided on the bottom surface of the engine housing 100 adjacent to the sidewall 111. The side of the rotation limiter 130 facing away from the bottom surface abuts against the fixing member 310. The rotation limiter 130 limits the rotation of the fixing member 310 about the first axis x. The rotation limiter 130 can limit the rotation of the fixing member 310 about the first axis x, eliminating the need to manually limit the rotation of the fixing member 310 and the reflector 200 about the first axis x during adjustment of the reflector 200. This improves the convenience and accuracy of adjusting the positions of the fixing member 310 and the reflector 200.

[0114] For example, the engine housing 100 may also be provided with an adjustment hole 121, for example, provided on the cover plate 120. The adjustment hole 121 is opposite the adjustment mechanism 300, and a sealing sheet 122 is provided on the adjustment hole 121. After the optical engine is assembled, the sealing sheet 122 can be removed to allow the adjustment mechanism 300 to be adjusted again through the adjustment hole 121. For example, after the optical engine is turned on, the position of the reflector 200 can be adjusted again through the adjustment mechanism 300 based on the image projected by the optical engine to improve the image quality of the optical engine.

[0115] To facilitate understanding of the technical solutions of the embodiments of the present application, the following describes in detail the process of adjusting the reflector 200 in three degrees of freedom.

[0116] refer to Figure 11 and Figure 16 After the adjustment mechanism 300 is assembled, it is in its initial state. First, the rotation of the fixing member 310 and the second adjustment member 340 about the first axis x is restricted. For example, the rotation of the fixing member 310 about the first axis xx can be restricted by a rotation limiter. The first limiting protrusion 347 and the second limiting protrusion 317 can be manually fixed to prevent relative rotation between the second adjustment member 340 and the fixing member 310, allowing the second adjustment member 340 to rotate synchronously with the fixing member 310, thereby restricting the rotation of the second adjustment member 340 about the first axis x.

[0117] The first adjusting member 330 can be rotated via the first operating portion 335, causing the first adjusting member 330 to rotate relative to the sidewall 111 of the engine housing 100 about the first axis x. The first pushing surface 334 of the first adjusting member 330 pushes the two first abutting portions 343, causing the distance between one of the first abutting portions 343 and the sidewall 111 to decrease and the distance between the other first abutting portion 343 and the sidewall 111 to increase, thereby causing the second adjusting member 340, the fixing member 310, and the reflector 200 to rotate about a second axis y perpendicular to the first axis x. Due to the limiting action between the first limiting surface 333 and the second limiting surface 342, the second axis y passes through the center of the sphere located on the first axis x, thereby intersecting the second axis y with the first axis x. In this manner, the angle of the reflector 200 about the second axis y can be adjusted.

[0118] Then, by fixing the first operating portion 335 and the first limiting protrusion, the first adjusting member 330 and the second adjusting member 340 can be rotated synchronously. The first and second adjusting members 330 and 340 are then rotated synchronously, rotating relative to the sidewall 111 of the engine housing 100 about the first axis x. The second pushing surface 346 of the second adjusting member 340 pushes the two second abutting portions 316, reducing the distance between one second abutting portion 316 and the sidewall 111 and increasing the distance between the other second abutting portion 316 and the sidewall 111. This causes the fixing member 310 and the reflector 200 to rotate about a third axis z, which is perpendicular to the first axis x. Furthermore, due to the 90° rotation of the second pushing surface 346 relative to the first pushing surface 334 about the first axis x, the third axis z becomes perpendicular to the second axis y. Due to the limiting action between the third limiting surface 345 and the fourth limiting surface 315, the third axis z passes through the center of the sphere located on the first axis x, thereby intersecting the first axis x. In this way, the angle of the reflector 200 around the third axis z can be adjusted.

[0119] Subsequently, the adjustment bolt 321 can be rotated, and the fixing member 310 and the reflector 200 can be moved relative to the adjustment bolt 321 along the first axis x under the action of the compressed elastic member 322. In this way, the displacement of the reflector 200 along the first axis x can be adjusted. When the displacement of the reflector 200 along the first axis x is adjusted, the rotation angle of the reflector 200 about the second axis y and the rotation angle about the third axis z of the reflector 200 are not affected. This improves the adjustment accuracy of the adjustment mechanism 300, reduces the difficulty of adjusting the reflector 200, reduces the difficulty of assembling the optical engine, and improves the production efficiency of the laser projection display device.

[0120] After completing the adjustment of the three degrees of freedom of the reflector 200, the first groove 332 and the first protrusion 341, the second groove 344 and the second protrusion 314, and the adjustment bolt 321 can be fixed by dispensing glue or the like to fix the position of the reflector 200 and prevent the reflector 200 from being shifted in position during subsequent assembly processes.

[0121] Second embodiment

[0122] In the second embodiment of this application, refer to Figure 23 、 Figure 24 and Figure 25 , which differs from the first embodiment of the present application in that: a first protrusion 341 may be provided on the side of the first adjusting member 330 facing the fixed member 310, a first limiting surface 333 is provided on the circumferential side of the first protrusion 341, and a first pushing surface 334 is provided on the end of the first protrusion 341. The first pushing surface 334 intersects with the first axis x and is not perpendicular to it. The fixed member 310 has a first groove 332 on the side facing the first adjusting member 330, which is sleeved on the first protrusion 341. For example, in some possible implementations of the embodiment of the present application, the first groove 332 may be provided on the fixed member 310 and located on the adjustment portion 313 of the fixed member 310 facing the first adjusting member 330. A second limiting surface 342 is provided on the circumferential side of the first groove 332, which contacts the first limiting surface 333. The second limiting surface 342 and the first limiting surface 333 may both be first partial spherical surfaces, with the center S1 of the first partial spherical surface located on the first axis x. The bottom of the first groove 332 may be provided with two first abutting portions 343 of equal length. The two first abutting portions 343 are located on either side of the first axis x and abut against the first pushing surface 334. When the first adjusting member 330 is rotated to restrict the fixing member 310 from rotating about the first axis x, the first pushing surface 334 pushes the two first abutting portions 343, causing the second limiting surface 342 to rotate relative to the first limiting surface 333, thereby rotating the fixing member 310 and the reflector 200 about a second axis y that is perpendicular to and intersects the first axis x.

[0123] When a rotational force is applied to the first adjustment member 330 and the fixed member 310 is restricted from rotating about the first axis x, the first pushing surface 334 of the first adjustment member 330 rotates relative to the first axis x and pushes the two first abutting portions 343, causing the distance between one of the first abutting portions 343 and the side wall 111 to decrease and the distance between the other first abutting portion 343 and the side wall 111 to increase, thereby causing the fixed member 310 and the reflector 200 to rotate about the second axis y, which is perpendicular to the first axis x. In this way, the adjustment mechanism 300 can adjust the reflector 200 with two degrees of freedom: displacement along the first axis x and angle around the second axis y.

[0124] Due to the limiting effect between the first limiting surface 333 and the second limiting surface 342, the second axis y passes through the center of the sphere located on the first axis x, so that the second axis y intersects with the first axis x. When the displacement of the fixing member 310 and the reflector 200 along the first axis x is adjusted, the rotation angle of the fixing member 310 and the reflector 200 around the second axis y will not be affected, thereby improving the adjustment accuracy of the adjustment mechanism 300, reducing the adjustment difficulty of the reflector 200, reducing the assembly difficulty of the optical engine, and improving the production efficiency of the laser projection display device.

[0125] In some other possible implementations of the embodiments of the present application, the adjustment mechanism 300 may further include a second adjustment member 340, which is located between the first adjustment member 330 and the fixing member 310. In other words, the second adjustment member 340 is located on the side of the fixing member 310 facing the first adjustment member 330. A first groove 332 may be provided on the second adjustment member 340 and located at the end of the second adjustment member 340 facing the first adjustment member 330. A first protrusion 341 and a first groove 332 are provided between the first adjustment member 330 and the second adjustment member 340 connected to the fixing member 310. When the first adjustment member 330 is rotated and the rotation of the second adjustment member 340 and the fixing member 310 about the first axis x is restricted, the rotation angle of the reflector 200 about the second axis y can be adjusted. This embodiment of the present application will not be described in detail.

[0126] For example, the second adjusting member 340 may be provided with a second protrusion 314 on the side facing the fixed member 310. A third limiting surface 345 is provided on the circumferential side of the second protrusion 314 around the first axis x. A second pushing surface 346 is provided at the end of the second protrusion 314. The second pushing surface 346 rotates 90° around the first axis x relative to the first pushing surface 334. The fixed member 310 may have a second groove 344 on the side facing the second adjusting member 340, which is sleeved onto the second protrusion 314. A fourth limiting surface 315 is provided on the circumferential side of the second groove 344, which contacts the third limiting surface 345. Both the third limiting surface 345 and the fourth limiting surface 315 are second partial spherical surfaces, with the center S2 of the second partial spherical surface located on the first axis x. Two second abutting portions 316 of equal length are provided at the bottom of the second groove 344. The two second abutting portions 316 are located on either side of the first axis x and abut against the second pushing surface 346. When the first adjusting member 330 and the second adjusting member 340 are rotated synchronously and the fixing member 310 is restricted from rotating around the first axis x, the second pushing surface 346 pushes the two second abutting portions 316, and the third limiting surface 345 and the fourth limiting surface 315 rotate relative to each other, so that the fixing member 310 and the reflector 200 rotate around the third axis z that is perpendicular to and intersects the first axis x and is perpendicular to the second axis y.

[0127] A second protrusion 314 and a second recess 344 are disposed between the second adjusting member 340 and the fixing member 310. A third limiting surface 345 and a fourth limiting surface 315 are disposed between the second protrusion 314 and the second recess 344. Both the third limiting surface 345 and the fourth limiting surface 315 are second partial spherical surfaces whose centers lie on the first axis x. A second pushing surface 346 is disposed at the end of the second protrusion 314 of the second adjusting member 340, intersecting with and not perpendicular to the first axis x. Two second abutting portions 316 of equal length are disposed at the bottom of the second recess 344 of the fixing member 310. The two second abutting portions 316 are located on either side of the first axis x and abut against the second pushing surface 346. When a rotational force is simultaneously applied to the first adjustment member 330 and the second adjustment member 340, restricting the rotation of the fixed member 310 about the first axis x, the second pushing surface 346 of the second adjustment member 340 rotates relative to the first axis x and pushes the two second abutting portions 316, causing the distance between one second abutting portion 316 and the sidewall 111 to decrease and the distance between the other second abutting portion 316 and the sidewall 111 to increase, thereby causing the fixed member 310 and the reflector 200 to rotate about a third axis z, which is perpendicular to the first axis x. Furthermore, because the second pushing surface 346 rotates 90° relative to the first pushing surface 334 about the first axis x, the third axis z becomes perpendicular to the second axis y. In this way, the adjustment mechanism 300 can adjust the reflector 200 in three degrees of freedom: displacement along the first axis x, angle about the second axis y, and angle about the third axis z.

[0128] Furthermore, due to the limiting action between the third limiting surface 345 and the fourth limiting surface 315, the third axis z passes through the center of the sphere located on the first axis x, thereby intersecting the first axis x. This ensures that when the displacement of the fixing member 310 and the reflector 200 along the first axis x is adjusted, the rotation angle of the fixing member 310 and the reflector 200 about the third axis z is not affected, thereby further improving the adjustment accuracy of the adjustment mechanism 300, reducing the difficulty of adjusting the reflector 200, and reducing the difficulty of assembling the optical engine, thereby improving the production efficiency of the laser projection display device.

[0129] For other parts of the laser projection display device of the second embodiment of the present application, reference may be made to the description of the relevant parts of the first embodiment of the present application, and no further details will be given here.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; 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.

[0131] The foregoing description has been presented for the purpose of illustration and description. It is not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. Modifications and variations are possible in light of the above teachings or can be acquired from practice of the embodiments. The described embodiments were chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best use the application in various embodiments and with various modifications as are suited to the particular use contemplated.

Claims

1. A laser projection display device, characterized in that: include: an optical engine configured to project an image outward, the optical engine comprising: an engine housing configured with a receiving cavity; an optical element, located in the accommodating cavity; an adjustment mechanism connected to the optical element and configured to adjust the position of the optical element; wherein the adjustment mechanism comprises: a fixing member connected to the optical element; a displacement adjustment assembly configured to adjust the displacement of the fixing member and the optical element along the first axis; The first adjusting member is connected to a side wall of the engine housing for rotation around the first axis, and has a first limiting surface and a second limiting surface in contact with the fixing member, and the first limiting surface and the second limiting surface are both partial spherical surfaces whose axes are located on the first axis; the first adjusting member is provided with a first pushing surface that intersects with and is not perpendicular to the first axis; the fixing member has two first abutting portions of equal length on a side facing the first adjusting member, and the two first abutting portions are in abutment with the first pushing surface; when the first adjusting member rotates relative to the housing and limits the fixing member and the optical element from rotating around the first axis, the first pushing surface pushes the two first abutting portions, and under the limiting action of the first limiting surface and the second limiting surface, the fixing member and the optical element rotate around a second axis that is perpendicular to and intersects the first axis; The first adjusting member is located between a side wall of the engine housing and the fixing member. A first groove or a first protrusion is provided on a side of the first adjusting member facing the fixing member. The first limiting surface is provided on a circumferential side of the first groove or the first protrusion around the first axis. The first pushing surface is provided on a bottom of the first groove or an end of the first protrusion. The side of the fixing member facing the first adjusting member has a first protrusion accommodated in the first groove or a first groove sleeved on the first protrusion, and the circumferential side of the first protrusion or the first groove is provided with the second limiting surface; the end of the first protrusion or the bottom of the first groove is provided with two first abutting portions, and the two first abutting portions are respectively located on both sides of the first axis.

2. The laser projection display device according to claim 1, characterized in that: The adjustment mechanism further includes a second adjustment member, the second adjustment member being located between the first adjustment member and the fixed member, the first protrusion or the first groove being provided on a side of the second adjustment member facing the first adjustment member; a second groove or a second protrusion being provided on a side of the second adjustment member facing the fixed member, a third limiting surface being provided on a circumferential side of the second groove or the second protrusion around the first axis; a second pushing surface being provided on a bottom of the second groove or an end of the second protrusion, the second pushing surface being rotated 90° around the first axis relative to the first pushing surface; The fixing member has a second protrusion received in the second groove or a second groove sleeved on the second protrusion on a side facing the second adjusting member; a fourth limiting surface in contact with the third limiting surface is provided on a circumferential side of the second protrusion or the second groove; the third limiting surface and the fourth limiting surface are both second partial spherical surfaces with a center located on the first axis; two second abutting portions of equal length are provided at the end of the second protrusion or the bottom of the second groove, the two second abutting portions are respectively located on either side of the first axis and both abut against the second pushing surface; When the first adjusting member and the second adjusting member are rotated synchronously and the fixing member is restricted from rotating around the first axis, the second pushing surface pushes the two second abutting portions, and the third limiting surface and the fourth limiting surface rotate relative to each other, so that the fixing member and the optical element rotate around a third axis that is perpendicular to and intersects with the first axis and is perpendicular to the second axis.

3. The laser projection display device according to claim 2, characterized in that: The first adjusting member is provided with the first groove on one side thereof facing the fixing member, and the first limiting notch is provided on the circumferential side thereof facing the second adjusting member; The first protrusion is provided on a side of the second adjusting member facing the first adjusting member, and a first limiting protrusion is provided on a circumferential side of the first protrusion. The first limiting protrusion is inserted into the first limiting notch.

4. The laser projection display device according to claim 2, characterized in that: The second adjusting member is provided with a second groove on a side facing the fixing member, and a second limiting notch facing the fixing member is provided on a circumferential side of the second groove; The second protrusion is provided on a side of the fixing member facing the second adjusting member, and a second limiting protrusion is provided on a circumferential side of the second protrusion. The second limiting protrusion is inserted into the second limiting notch.

5. The laser projection display device according to claim 1, characterized in that: One of the first adjusting member and the side wall is provided with a cylindrical connecting protrusion, the axis of the cylindrical connecting protrusion is the first axis; the other is provided with an annular connecting groove, and the annular connecting groove is sleeved on the cylindrical connecting protrusion.

6. The laser projection display device according to claim 1, characterized in that: A first operating portion is provided on the outer side of the first adjusting member, and the first adjusting member is rotated by the first operating portion.

7. The laser projection display device according to any one of claims 2 to 6, characterized in that: The side wall is provided with a first through hole, and the axis of the first through hole coincides with the first axis; The first adjusting member is provided with a second through hole, and the second through hole is opposite to the first through hole; The second adjusting member is provided with a third through hole, and the third through hole is opposite to the second through hole; A threaded hole is provided on a side of the fixing member facing the second adjusting member; The displacement adjustment assembly includes an adjustment bolt and a compression elastic member, wherein the adjustment bolt is sequentially inserted into the first through hole, the second through hole, and the third through hole and connected to the threaded hole; the compression elastic member is located between the first adjustment member and the side wall, and both ends of the compression elastic member abut against the side wall and the first adjustment member, respectively, and applies a thrust to the side wall and the first adjustment member, so that the end cap of the adjustment bolt abuts against the side wall, and the first adjustment member, the second adjustment member, and the fixing member abut against each other; When the adjusting bolt is rotated, the fixing member moves along the first axis under the thrust of the compression elastic member.

8. The laser projection display device according to any one of claims 1 to 6, characterized in that: A rotation limiting portion is provided on the bottom surface of the engine housing adjacent to the side wall. The side of the rotation limiting portion facing away from the bottom surface abuts against the fixing member, and the rotation limiting portion limits the rotation of the fixing member around the first axis.

9. The laser projection display device according to any one of claims 1 to 6, characterized in that: The engine housing is provided with an adjustment through hole, the adjustment through hole is opposite to the adjustment mechanism, and a packaging sheet is provided on the upper cover of the adjustment through hole.

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