Display optical module and display device

Abstract

Embodiments of the present disclosure provide a display optical module and a display device. The display optical module comprises a first optical element and a second optical element which are attached to each other. The first optical element is provided with a first alignment structure, and the second optical element is provided with a second alignment structure. The first alignment structure and the second alignment structure are opposite along a first direction. The first alignment structure receives an initial detection light source which travels along an initial light path, and changes the initial light path of the initial detection light source to a first alignment light path to obtain a first alignment light source. The second alignment structure receives the first alignment light source, and changes the first alignment light path of the first alignment light source to a second alignment light path to obtain a second alignment light source. The first optical parameter of the first alignment light source and the second alignment light source is equal, or the second optical parameter of the first alignment light source and the second alignment light source satisfies a preset condition. Whether the two alignment structures are aligned is determined according to the change of the optical parameter, so as to determine whether the two optical elements are aligned with high precision.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of optical lens alignment, and in particular to a display optical module and a display device. BACKGROUND

[0002] A display optical module of a display device usually includes multiple lenses. When assembling the display optical module, the multiple lenses need to be aligned so that the main optical axes of the multiple lenses coincide to achieve the output of a light source.

[0003] In related technologies, a method for aligning multiple lenses includes: using an image recognition system to obtain an edge profile image of each lens, fitting an edge line according to the edge profile image to obtain the contour of each lens, calculating the center of the contour, and finally using a mechanical device to displace the lens according to the center to achieve alignment.

[0004] However, due to the influence of image contrast and shadow, there will be a certain error when obtaining the contour of the lens, and the calculated center of the lens contour is not accurate, resulting in low alignment accuracy and affecting the imaging quality of the display device. SUMMARY

[0005] Embodiments of the present disclosure provide a display optical module and a display device to overcome the problem of poor imaging quality of the display device caused by low lens alignment accuracy.

[0006] In a first aspect, embodiments of the present disclosure provide a display optical module, which includes: a first optical element and a second optical element that are attached together, a first alignment structure is arranged on the first optical element, a second alignment structure is arranged on the second optical element, and the first alignment structure and the second alignment structure are opposite along a first direction; the first alignment structure is configured to receive an initial detection light source traveling along an initial optical path and to change the initial optical path of the initial detection light source to a first alignment optical path to obtain a first alignment light source; the second alignment structure is configured to receive the first alignment light source and to change the first alignment optical path of the first alignment light source to a second alignment optical path to obtain a second alignment light source; wherein the first optical parameter of the first alignment light source and the second alignment light source is equal, or the second optical parameter of the first alignment light source and the second alignment light source satisfies a preset condition.

[0007] In a second aspect, embodiments of the present disclosure provide a display device, which includes the display optical module described above.

[0008] The display optical module and the display device provided by the embodiment can judge whether the first optical element and the second optical element are aligned by setting the first alignment structure and the second alignment structure on the first optical element and the second optical element respectively, and judging whether the first alignment structure and the second alignment structure are aligned according to the change of the optical parameter of the detection light source, thereby effectively solving the problem of low alignment precision of any two lenses in alignment. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0010] Figure 1 The cross-sectional structure example of the first optical element and the second optical element provided by the embodiment of the present disclosure is shown in the following figure.

[0011] Figure 2 The cross-sectional structure example of the display optical module provided by the first embodiment of the present disclosure is shown in the following figure. Figure 1 ;

[0012] Figure 3 The cross-sectional structure example of the display optical module provided by the first embodiment of the present disclosure is shown in the following figure. Figure 2 ;

[0013] Figure 4 The schematic diagram of the light source passing through the first through hole and the second through hole provided by the first embodiment of the present disclosure is shown in the following figure. Figure 1 ;

[0014] Figure 2 The schematic diagram of the light source passing through the first through hole and the second through hole provided by the first embodiment of the present disclosure is shown in the following figure. Figure 6 ;

[0015] Figure 1 The cross-sectional structure example of the display optical module provided by the second embodiment of the present disclosure is shown in the following figure. Figure 7 ;

[0016] Figure 8 The top view structure example of the display optical module provided by the second embodiment of the present disclosure is shown in the following figure.

[0017] Figure 2 The cross-sectional structure example of the display optical module provided by the second embodiment of the present disclosure is shown in the following figure. Figure 9 ;

[0018] Figure 3A cross-sectional structure example of a display optical module provided for the second embodiment of the present disclosure Figure 10 ;

[0019] Figure 4 A cross-sectional structure example of a display optical module provided for the second embodiment of the present disclosure Figure 11 ;

[0020] Figure 5 A cross-sectional structure example of a display optical module provided for the second embodiment of the present disclosure Figure 1 .

[0021] Reference signs:

[0022] 100: first optical element;

[0023] 101: first optical element body; 102: first moving platform;

[0024] 110: optical element central axis; 120: alignment structure central axis;

[0025] 1021: first surface; 1022: second surface;

[0026] 10211: first arc-shaped focusing lens; 10221: first arc-shaped groove;

[0027] 200: second optical element;

[0028] 201: second optical element body; 202: second moving platform;

[0029] 2021: third surface; 2022: fourth surface;

[0030] 20211: second arc-shaped groove;

[0031] 300: first alignment structure;

[0032] 400: second alignment structure;

[0033] a: initial detection light source; b: first alignment light source; c: second alignment light source. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present disclosure.

[0035] In related technologies, when using an image recognition system to acquire the edge contour image of each lens, the acquired edge contour image has certain errors due to the influence of image contrast and shadows. The center of the calculated lens outline is not accurate, resulting in low alignment accuracy and affecting the imaging quality of the display device.

[0036] This disclosure provides a display optical module and display device to solve the above-mentioned problems.

[0037] refer to Figure 1 , Figure 1 This is an example cross-sectional view of the first and second optical elements provided in an embodiment of the present disclosure. The display optical module includes a first optical element 100 and a second optical element 200, which are arranged along a first direction ( Figure 1 The optical elements are arranged vertically (as shown in the diagram), with the first optical element 100 positioned above the second optical element 200 and the first optical element 100 and the second optical element 200 in contact with each other. When the central axis of the first optical element 100 and the central axis of the second optical element 200 both coincide with the central axis 110 of the optical element, it indicates that the alignment of the first optical element 100 and the second optical element 200 is complete.

[0038] A first alignment structure is provided on the first optical element 100, and a second alignment structure is provided on the second optical element 200. The first alignment structure and the second alignment structure are aligned along a first direction ( Figure 1 (As shown in the vertical direction) When the central axis of the first alignment structure and the central axis of the second alignment structure both coincide with the central axis 120 of the alignment structure, it means that the central axis of the first optical element 100 and the central axis of the second optical element 200 also coincide with the central axis 110 of the optical element.

[0039] The first alignment structure is used to receive the initial detection light source traveling along the initial optical path, so that the initial detection light source enters the first optical element 100 from the first alignment structure. When the initial detection light source enters the first alignment structure, the first alignment structure will change the optical path of the initial detection light source, so that the initial optical path is changed to the first alignment optical path, and the first alignment light source is obtained. The first alignment light source will exit the first optical element 100 from the first alignment structure.

[0040] The second alignment structure is used to receive the first alignment light source, so that the first alignment light source enters the second optical element 200 from the second alignment structure. When the first alignment light source enters the second alignment structure, the second alignment structure will change the optical path of the first alignment light source, so that the first alignment optical path is changed to the second alignment optical path, and the second alignment light source is obtained. The second alignment light source will exit the second optical element 200 from the second alignment structure.

[0041] The first optical parameters of the first alignment light source and the second alignment light source are equal, indicating that the central axis of the first alignment structure and the central axis of the second alignment structure both coincide with the central axis 120 of the alignment structure.

[0042] Alternatively, if the second optical parameters of the first and second alignment light sources meet the preset conditions, it indicates that the central axis of the first and second alignment structures both coincide with the central axis 120 of the alignment structure.

[0043] The display optical module provided in this embodiment includes a first optical element 100 and a second optical element 200 bonded together. A first alignment structure is disposed on the first optical element 100, and a second alignment structure is disposed on the second optical element 200. The first alignment structure and the second alignment structure are aligned along a first direction (…). Figure 2 The first alignment structure is used to receive the initial detection light source traveling along the initial optical path and to change the initial optical path of the initial detection light source into the first alignment optical path to obtain the first alignment light source; the second alignment structure is used to receive the first alignment light source and to change the first alignment optical path of the first alignment light source into the second alignment optical path to obtain the second alignment light source; wherein, the first optical parameters of the first alignment light source and the second alignment light source are equal, or the second optical parameters of the first alignment light source and the second alignment light source meet preset conditions. By setting the first alignment structure and the second alignment structure on the first optical element 100 and the second optical element 200 that are attached to each other, and shining the detection light source into the first alignment structure and the second alignment structure, the alignment of the first alignment structure and the second alignment structure is determined according to the change of the optical parameters of the detection light source, thereby determining whether the first optical element and the second optical element are aligned, effectively solving the problem of low alignment accuracy when aligning any two lenses.

[0044] The first and second optical elements in the embodiments of this disclosure may include curved lenses, flat lenses, or lenses combining curved and flat surfaces.

[0045] The display optical module provided in this disclosure will be described in detail below through two embodiments.

[0046] Example 1

[0047] refer to Figure 3 and Figure 2 , Figure 1 Example of a cross-sectional structure of a display optical module provided in Embodiment 1 of this disclosure Figure 3 , Figure 2 Example of a cross-sectional structure of a display optical module provided in Embodiment 1 of this disclosure Figure 2 .

[0048] The first optical element 100 comprises a first optical element body 101, which can be a circular planar lens or a circular curved lens, and a first moving platform 102 extending outward along the circumference of the edge of the first optical element body 101, which can be a circular annular planar lens; and the first moving platform 102 is provided with a first alignment structure 300.

[0049] The second optical element 200 comprises a second optical element body 201, which can be a circular planar lens, and the second optical element body 201 is attached to the first optical element body 101; or the second optical element body 201 can be a circular curved lens, and the second optical element body 201 is opposite to the first optical element body 101 along a first direction (i.e., the vertical direction shown in FIG. 1). Figure 2 The edge of the second optical element body 201 extends outward along the circumference of the edge of the second optical element body 201, and a second moving platform 202 extending outward along the circumference of the edge of the second optical element body 201 can be a circular annular planar lens, and the second moving platform 202 is attached to the first moving platform 102, and the second moving platform 202 is provided with a second alignment structure 400.

[0050] The moving platform is arranged at the edge of the optical element body, and the alignment structure is arranged on the moving platform, so that the alignment of the optical element can be realized, and the normal use of the optical element body can be avoided.

[0051] In the first embodiment of the present disclosure, the first alignment structure 300 can comprise at least two first alignment structures 300, and the at least two first alignment structures 300 are arranged at intervals along the circumference of the first moving platform 102; the second alignment structure 400 can also comprise at least two second alignment structures 400, and the at least two second alignment structures 400 are arranged at intervals along the circumference of the second moving platform 202; and each first alignment structure 300 corresponds to a second alignment structure 400 opposite along a first direction (i.e., the vertical direction shown in FIG. 1). Figure 4 The alignment detection of the at least two alignment structures at the same time can further ensure the accuracy of the alignment of the lens.

[0052] Reference Figure 5 and Figure 4 , Figure 1 The schematic diagram of the light source provided in the first embodiment of the present disclosure through the first through hole and the second through hole Figure 5 , Figure 2 The schematic diagram of the light source provided in the first embodiment of the present disclosure through the first through hole and the second through hole Figure 2 In the first embodiment of the present disclosure, the first alignment structure 300 comprises a first through hole, the second alignment structure 400 comprises a second through hole, the diameter of the first through hole is the same as that of the second through hole, the center axis of the first through hole coincides with the center axis of the second through hole, and the center axis of the first through hole is coaxial with a first direction axis (i.e., the vertical direction shown in FIG. 1).Figure 4 The vertical direction axis shown in the middle is parallel.

[0053] The initial detection light source a enters the first optical element 100 from the first alignment structure 300, wherein the inner wall of the first through-hole is used to receive the initial detection light source a, and after the initial detection light source a is incident to the inner wall of the first through-hole, the inner wall of the first through-hole is also used to reflect the initial detection light source a, thereby changing the optical path of the initial detection light source a, to obtain the first alignment light source b traveling along the first alignment light path. The first alignment light source b exits the first optical element 100 from the first alignment structure 300.

[0054] The first alignment light source b enters the second optical element 200 from the second alignment structure 400, wherein the inner wall of the second through-hole is used to receive the first alignment light source b, and after the first alignment light source b is incident to the inner wall of the second through-hole, the inner wall of the second through-hole is also used to reflect the first alignment light source b, thereby changing the optical path of the first alignment light source b, to obtain the second alignment light source c traveling along the second alignment light path. The second alignment light source c exits the second optical element 200 from the second alignment structure 400.

[0055] The first optical parameters of the first alignment light source b and the second alignment light source c are equal, and the first optical parameters include light intensity.

[0056] As shown in Figure 3 and Figure 5 , the light intensity of the first alignment light source b is equal to the light intensity of the second alignment light source c, indicating that the light source incident into the first through-hole and the second through-hole and reflected by the inner wall of the first through-hole and the inner wall of the second through-hole does not have energy loss, the center axis of the first through-hole and the center axis of the second through-hole coincide, the first alignment structure 300 and the second alignment structure 400 are aligned, and the first optical element 100 and the second optical element 200 complete alignment.

[0057] As shown in Figure 2 and Figure 4 , the light intensity of the first alignment light source b is greater than the light intensity of the second alignment light source c, indicating that the light source incident into the first through-hole and the second through-hole and reflected by the inner wall of the first through-hole and the inner wall of the second through-hole has a certain energy loss; wherein the first alignment light source b obtained after being reflected by the inner wall of the first through-hole, when entering the second through-hole, has energy loss due to the inner wall of the second through-hole not being flush with the inner wall of the first through-hole; that is, at this time, the center axis of the first through-hole and the center axis of the second through-hole do not coincide, the first alignment structure 300 and the second alignment structure 400 are not aligned, and the first optical element 100 and the second optical element 200 do not complete alignment.

[0058] This embodiment determines whether the first optical element 100 and the second optical element 200 are aligned by measuring the changes in incident light intensity and emitted light intensity. The structure is simple and can achieve precise alignment.

[0059] In the first embodiment of this disclosure, a reflective medium layer is provided on the inner wall of the first through-hole to reflect the initial detection light source a and the first alignment light source b; a reflective medium layer is provided on the inner wall of the second through-hole to reflect the second alignment light source c. The reflective medium layer has high reflectivity, reducing the absorption and scattering of the light source by the reflective medium layer.

[0060] Continue to refer to Figures 6-11 and Figure 6 In the first embodiment of this disclosure, the initial optical path includes an initial incident angle e. Both the first and second alignment optical paths include multiple reflection optical paths, with each reflection optical path having the same incident angle as the initial incident angle e. That is, the first alignment light source b undergoes multiple reflections within the first through-hole before entering the second through-hole, and the second alignment light source c undergoes multiple reflections within the second through-hole before exiting. Simultaneously, the incident angle of each reflection optical path is the same as the initial incident angle e, ensuring that no energy loss occurs during the multiple reflections of the first and second alignment light sources b and c.

[0061] In the first embodiment of this disclosure, the initial optical path includes a single beam of light.

[0062] Example 2

[0063] refer to Figure 1 , Figure 7 Example of a cross-sectional structure of the display optical module provided in Embodiment 2 of this disclosure Figure 8 , Figure 2 This is a top view example of the display optical module provided in Embodiment 2 of this disclosure. Figure 9 Example of a cross-sectional structure of the display optical module provided in Embodiment 2 of this disclosure Figure 3 , Figure 10 Example of a cross-sectional structure of the display optical module provided in Embodiment 2 of this disclosure Figure 4 , Figure 11 Example of a cross-sectional structure of the display optical module provided in Embodiment 2 of this disclosure Figure 5 , Figure 6 Example of a cross-sectional structure of the display optical module provided in Embodiment 2 of this disclosure Figure 8 .

[0064] The first optical element 100 includes a first optical element body 101, which may be a circular plane lens or a circular curved lens. A first moving platform 102 extends outward along the circumferential direction from the edge of the first optical element body 101. The first moving platform 102 may be an annular plane lens. A first alignment structure 300 is provided on the first moving platform 102.

[0065] The second optical element 200 includes a second optical element body 201, which may be a circular planar lens and is attached to the first optical element body 101; alternatively, the second optical element body 201 may be a circular curved lens, and the second optical element body 201 and the first optical element body 101 are aligned along a first direction. Figure 9 (as shown in the vertical direction) opposite; the edge of the second optical element body 201 extends outward along its circumference to form a second moving platform 202, which may be a circular plane lens. The second moving platform 202 is attached to the first moving platform 102, and a second alignment structure 400 is provided on the second moving platform 202.

[0066] By setting a moving platform at the edge of the optical element body and placing the alignment structure on the moving platform, not only can the optical element be aligned, but the normal use of the optical element body can also be avoided.

[0067] refer to Figure 8 and Figure 9 In the second embodiment of this disclosure, the first mobile platform 102 has a first direction ( Figure 8 and Figure 9 The second moving platform 202 has a first surface 1021 and a second surface 1022 opposite each other in the vertical direction shown in the figure, and a third surface 2021 and a fourth surface 2022 opposite each other in the first direction, with the second surface 1022 and the third surface 2021 in contact with each other.

[0068] The first alignment structure 300 includes a first arc-shaped focusing lens 10211 protruding from the first surface 1021, and the first alignment structure 300 also includes a first arc-shaped groove 10221 disposed on the second surface 1022, the center of the first arc-shaped groove 10221 and the center of the first arc-shaped focusing lens 10211 being located on the same straight line. Figure 8 and Figure 9The first arc-shaped focusing lens 10211 can be a semicircular convex lens or an arc-shaped convex lens with a certain radius of curvature, and is configured to receive the initial detection light source a. When the initial detection light source a enters the first arc-shaped focusing lens 10211, the first arc-shaped focusing lens 10211 is further configured to refract the initial detection light source a to obtain a first alignment light source b traveling along a first alignment light path. The first alignment light source b is emitted from the first arc-shaped groove 10221 to the first alignment structure 300, that is, the first alignment light source b is emitted from the first arc-shaped groove 10221 to the first moving platform 102.

[0069] The second alignment structure 400 includes a second arc-shaped groove 20211 arranged on the third surface 2021. The second arc-shaped groove 20211 is opposite to the first arc-shaped groove 10221 along a first direction (as shown by the vertical dashed line in FIG. 2B) so that the second arc-shaped groove 20211 and the first arc-shaped groove 10221 jointly define a mounting cavity filled with a refractive medium, thereby obtaining a second arc-shaped focusing lens. The second arc-shaped focusing lens can be a circular convex lens or an elliptical convex lens with a certain radius of curvature. The second arc-shaped focusing lens is configured to receive the first alignment light source b emitted from the first arc-shaped groove 10221. When the first alignment light source b enters the second arc-shaped focusing lens, the second arc-shaped focusing lens is further configured to refract the first alignment light source b to obtain a second alignment light source c traveling along a second alignment light path. The second alignment light source c is emitted from the second arc-shaped groove 20211 to the second moving platform 202 and finally emitted from the fourth surface 2022 of the second moving platform 202. Figure 8 Figure 8 The second arc-shaped focusing lens is configured to receive the first alignment light source b emitted from the first arc-shaped groove 10221. When the first alignment light source b enters the second arc-shaped focusing lens, the second arc-shaped focusing lens is further configured to refract the first alignment light source b to obtain a second alignment light source c traveling along a second alignment light path. The second alignment light source c is emitted from the second arc-shaped groove 20211 to the second moving platform 202 and finally emitted from the fourth surface 2022 of the second moving platform 202.

[0070] In the above-described second embodiment of the present disclosure, the second optical parameter includes a focal length, and the focal lengths of the first alignment light source b and the second alignment light source c satisfy the following preset condition:

[0071]

[0072]

[0073]

[0074] wherein f is a preset value, f1 is the focal length of the first alignment light source b, and f2 is the focal length of the second alignment light source c. f1 and f2 satisfy the above formula ①.

[0075] ​n1 is the air refractive index, n2 is the refractive index of the first arc-shaped focusing lens 10211 and the first moving platform 102, n3 is the refractive index of the second arc-shaped focusing lens, R1 is the radius of curvature of the first arc-shaped focusing lens 10211, R2 is the radius of curvature of the first arc-shaped groove 10221, R3 is the radius of curvature of the second arc-shaped groove 20211, and d1 is the refractive index along the first direction ( Figure 6 (as shown in the vertical direction) from the highest point of the first arc-shaped focusing lens 10211 to the lowest point of the first arc-shaped groove 10221 (that is... Figure 10 The distance d2 is the distance from the lowest point of the first arc-shaped groove 10221 to the lowest point of the second arc-shaped groove 20211 along the first direction.

[0076] refer to Figure 11 f is a preset value. When f1 and f2 satisfy the above formula ①, the focal point of the first alignment light source b and the focal point of the second alignment light source c are located at the same point, the first alignment structure 300 and the second alignment structure 400 are aligned, and the first optical element 100 and the second optical element 200 are aligned.

[0077] Figure 8 and Figure 8 Due to the air refractive index n1, the refractive index n2 of the first arc-shaped focusing lens 10211 and the first moving platform 102, the refractive index n3 of the second arc-shaped focusing lens, the radius of curvature R1 of the first arc-shaped focusing lens 10211, the radius of curvature R2 of the first arc-shaped groove 10221, and along the first direction ( Figure 7 (as shown in the vertical direction) from the highest point of the first arc-shaped focusing lens 10211 to the lowest point of the first arc-shaped groove 10221 (that is... Figure 6 The distance d1 between the highest point in the first arc groove 20211 and the lowest point of the first arc groove 10221 along the first direction is a fixed value; and f is a preset value. When f1 and f2 do not satisfy the above formula ①, it means that the radius of curvature R3 of the second arc groove 20211 and the distance d2 between the lowest point of the first arc groove 10221 and the lowest point of the second arc groove 20211 change. The focal point of the first alignment light source b and the focal point of the second alignment light source c do not coincide. The first alignment structure 300 and the second alignment structure 400 are not aligned. The first optical element 100 and the second optical element 200 are not aligned.

[0078] refer to Figure 1 In the second embodiment of this disclosure, the first alignment structure 300 may include at least two, and the at least two first alignment structures 300 are arranged at intervals along the circumference of the first moving platform 102; the second alignment structure 400 may also include at least two, and the at least two second alignment structures 400 are arranged at intervals along the circumference of the second moving platform 202; each first alignment structure 300 corresponds to one second alignment structure 400 along a first direction ( ​The at least two alignment structures can simultaneously perform alignment detection, which can further ensure the accuracy of lens alignment.

[0079] That is, the first surface 1021 of the first mobile platform 102 can be provided with at least two first arc-shaped focusing lenses 10211, and the at least two first arc-shaped focusing lenses 10211 are arranged at intervals along the circumference of the second mobile platform 202.

[0080] In the second embodiment of the present disclosure, the refractive medium can include a liquid optical glue, and the liquid optical glue is filled in the mounting cavity jointly surrounded by the second arc-shaped groove 20211 and the first arc-shaped groove 10221.

[0081] The present disclosure also provides a display device, which includes the display optical module described above.

[0082] The display optical module of the present disclosure can be applied in a head-mounted augmented reality device or a head-mounted virtual reality device, but is not limited to the head-mounted augmented reality device or the head-mounted virtual reality device.

[0083] The display optical module and the display device provided by the present disclosure include a first optical element 100 and a second optical element 200 that are attached to each other, the first optical element 100 is provided with a first alignment structure, the second optical element 200 is provided with a second alignment structure, the first alignment structure and the second alignment structure are opposite along a first direction (the vertical direction shown in FIG. 1); ​ The first alignment structure is used for receiving an initial detection light source that travels along an initial light path, and is used for changing the initial light path of the initial detection light source into a first alignment light path to obtain a first alignment light source; the second alignment structure is used for receiving the first alignment light source, and is used for changing the first alignment light path of the first alignment light source into a second alignment light path to obtain a second alignment light source; wherein the first optical parameter of the first alignment light source and the second alignment light source is equal, or the second optical parameter of the first alignment light source and the second alignment light source satisfies a preset condition. By arranging the first alignment structure and the second alignment structure on the first optical element 100 and the second optical element 200 that are attached to each other respectively, and by shooting the detection light source into the first alignment structure and the second alignment structure, whether the first alignment structure and the second alignment structure are aligned is determined according to the change of the optical parameter of the detection light source, so as to determine whether the first optical element and the second optical element are aligned, thereby effectively solving the problem of low alignment accuracy of any two lenses during alignment.

[0084] In a first aspect, according to one or more embodiments of the present disclosure, a display optical module is provided, which is characterized by comprising a first optical element and a second optical element that are attached to each other, the first optical element is provided with a first alignment structure, the second optical element is provided with a second alignment structure, the first alignment structure and the second alignment structure are opposite along a first direction; the first alignment structure is configured to receive an initial detection light source that travels along an initial optical path, and is configured to change the initial optical path of the initial detection light source into a first alignment optical path, to obtain a first alignment light source; the second alignment structure is configured to receive the first alignment light source, and is configured to change the first alignment optical path of the first alignment light source into a second alignment optical path, to obtain a second alignment light source; wherein a first optical parameter of the first alignment light source and the second alignment light source is equal, or a second optical parameter of the first alignment light source and the second alignment light source satisfies a preset condition.

[0085] According to one or more embodiments of the present disclosure, the first optical element comprises a first optical element body, an edge of the first optical element body extends outward along a circumference thereof with a first moving platform, the first moving platform is provided with the first alignment structure; the second optical element comprises a second optical element body, the second optical element body is attached to the first optical element body, an edge of the second optical element body extends outward along a circumference thereof with a second moving platform, the second moving platform is attached to the first moving platform, and the second moving platform is provided with the second alignment structure.

[0086] According to one or more embodiments of the present disclosure, the first alignment structure comprises a first through-hole, the second alignment structure comprises a second through-hole, the first through-hole and the second through-hole have the same diameter, a central axis of the first through-hole coincides with a central axis of the second through-hole, and the central axis of the first through-hole is parallel to a first direction axis; an inner wall of the first through-hole is configured to receive the initial detection light source, and is configured to reflect the initial detection light source to obtain the first alignment light source that travels along the first alignment optical path; an inner wall of the second through-hole is configured to receive the first alignment light source, and is configured to reflect the first alignment light source to obtain the second alignment light source that travels along the second alignment optical path; the first alignment light source and the second alignment light source have the same first optical parameter, and the first optical parameter comprises light intensity.

[0087] According to one or more embodiments of the present disclosure, the inner wall of the first through-hole and the inner wall of the second through-hole are both provided with a reflective medium layer.

[0088] According to one or more embodiments of the present disclosure, the initial light path comprises an initial incident angle, and each of the first alignment light path and the second alignment light path comprises a plurality of reflection light paths, each of the reflection light paths having the same incident angle as the initial incident angle.

[0089] According to one or more embodiments of the present disclosure, the initial light path comprises a single beam of light.

[0090] According to one or more embodiments of the present disclosure, the first mobile platform has a first surface and a second surface opposite to each other along the first direction, and the second mobile platform has a third surface and a fourth surface opposite to each other along the first direction, and the second surface and the third surface are attached to each other; the first alignment structure comprises a first arc-shaped focusing lens protruding from the first surface, and the first alignment structure further comprises a first arc-shaped groove arranged on the second surface, a center of the first arc-shaped groove and a center of the first arc-shaped focusing lens being located on the same straight line, the first arc-shaped focusing lens being configured to receive the initial detection light source and refract the initial detection light source to obtain the first alignment light source traveling along the first alignment light path, the first alignment light source being emitted from the first arc-shaped groove; the second alignment structure comprises a second arc-shaped groove arranged on the third surface, the second arc-shaped groove being opposite to the first arc-shaped groove along the first direction, the second arc-shaped groove and the first arc-shaped groove jointly defining a mounting cavity filled with a refractive medium to obtain a second arc-shaped focusing lens, the second arc-shaped focusing lens being configured to receive the first alignment light source and refract the first alignment light source to obtain the second alignment light source traveling along the second alignment light path, the second alignment light source being emitted from the second arc-shaped groove; and the second optical parameter comprises a focal length, and the focal length of the first alignment light source and the focal length of the second alignment light source satisfy the preset condition.

[0091] According to one or more embodiments of the present disclosure, the preset condition comprises:

[0092]

[0093]

[0094]

[0095] Wherein, f is a preset value, f1 is the focal length of the first alignment light source, f2 is the focal length of the second alignment light source, n1 is the air refractive index, n2 is the refractive index of the first arc-shaped focusing lens and the first moving platform, n3 is the refractive index of the second arc-shaped focusing lens, R1 is the radius of curvature of the first arc-shaped focusing lens, R2 is the radius of curvature of the first arc-shaped groove, R3 is the radius of curvature of the second arc-shaped groove, d1 is the distance from the highest point of the first arc-shaped focusing lens to the lowest point of the first arc-shaped groove along the first direction, and d2 is the distance from the lowest point of the first arc-shaped groove to the lowest point of the second arc-shaped groove along the first direction.

[0096] According to one or more embodiments of the present disclosure, the refractive medium comprises a liquid optical glue.

[0097] According to one or more embodiments of the present disclosure, the first alignment structure comprises at least two, and the at least two first alignment structures are arranged along the circumference of the first moving platform; the second alignment structure comprises at least two, and the at least two second alignment structures are arranged along the circumference of the second moving platform; each of the first alignment structures corresponds to one of the second alignment structures in the first direction.

[0098] In a second aspect, according to one or more embodiments of the present disclosure, a display device is provided, which comprises the display optical module described above.

[0099] The above description is merely preferred embodiments of the present disclosure and a description of the principles of the technology applied. It should be understood by those skilled in the art that the disclosed scope of the present disclosure is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combinations of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features can be replaced with the technical features disclosed in the present disclosure (but not limited to) having similar functions to form technical solutions.

[0100] In addition, although each operation is depicted in a particular order, this should not be understood as requiring the operations to be performed in the particular order shown or in a sequential order. In certain circumstances, multitasking and parallel processing can be advantageous. Similarly, although several implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Certain features described in the context of separate embodiments can also be combined in a single embodiment. Conversely, various features described in the context of a single embodiment can also be separated and implemented in multiple embodiments. The various features described in the context of separate embodiments can also be combined in a single embodiment.

[0101] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A display optical module, characterized in that, It includes a first optical element and a second optical element that are attached to each other. The first optical element is provided with a first alignment structure, and the second optical element is provided with a second alignment structure. The first alignment structure and the second alignment structure are opposite to each other along a first direction. The first alignment structure includes a first through hole, and the second alignment structure includes a second through hole. The first through hole and the second through hole have the same diameter. The central axis of the first through hole and the central axis of the second through hole coincide. The central axis of the first through hole is parallel to the first direction axis. The inner wall of the first through hole is used to receive the initial detection light source traveling along the initial optical path and to reflect the initial detection light source to obtain the first alignment light source traveling along the first alignment optical path. The inner wall of the second through hole is used to receive the first alignment light source and to reflect the first alignment light source to obtain a second alignment light source traveling along the second alignment optical path; The light intensities of the first and second aligned light sources are equal.

2. A display optical module, characterized in that, It includes a first optical element and a second optical element that are attached to each other. The first optical element is provided with a first alignment structure, and the second optical element is provided with a second alignment structure. The first alignment structure and the second alignment structure are opposite to each other along a first direction. The first alignment structure includes an arc-shaped convex surface and a first arc-shaped concave surface. The centers of the arc-shaped convex surface and the arc-shaped concave surface are located on the same straight line. The arc-shaped convex surface is used to receive the initial detection light source traveling along the initial optical path and to refract the initial detection light source to obtain the first alignment light source traveling along the first alignment optical path. The first alignment light source is emitted from the arc-shaped concave surface. The second alignment structure includes a second arc-shaped concave surface, which together with the first arc-shaped concave surface encloses an installation chamber. The installation chamber is used to receive the first alignment light source and to refract the first alignment light source to obtain the second alignment light source traveling along the second alignment light path. The second alignment light source is emitted from the second arc-shaped concave surface. The focal lengths of the first and second aligned light sources meet preset conditions.

3. The display optical module according to claim 2, characterized in that, The first optical element includes a first optical element body, and a first moving platform extends outward along the circumferential direction from the edge of the first optical element body. The first alignment structure is disposed on the first moving platform. The second optical element includes a second optical element body, which is attached to the first optical element body. A second moving platform extends outward along the circumferential direction from the edge of the second optical element body. The second moving platform is attached to the first moving platform. The second alignment structure is provided on the second moving platform.

4. The display optical module according to claim 1, characterized in that, The inner walls of both the first through hole and the second through hole are provided with a reflective medium layer.

5. The display optical module according to claim 1, characterized in that, The initial optical path includes an initial incident angle. Both the first alignment optical path and the second alignment optical path include multiple reflected optical paths, and the incident angle of each reflected optical path is the same as the initial incident angle.

6. The display optical module according to claim 1, characterized in that, The initial optical path consists of a single beam of light.

7. The display optical module according to claim 3, characterized in that, The first mobile platform has a first surface and a second surface opposite to each other along the first direction, and the second mobile platform has a third surface and a fourth surface opposite to each other along the first direction, with the second surface and the third surface being in contact with each other; The first alignment structure includes a first arc-shaped focusing lens protruding from the first surface. The first alignment structure also includes a first arc-shaped groove disposed on the second surface. The center of the first arc-shaped groove and the center of the first arc-shaped focusing lens are on the same straight line. The first arc-shaped focusing lens is used to receive the initial detection light source and to refract the initial detection light source to obtain the first alignment light source traveling along the first alignment optical path. The first alignment light source is emitted from the first arc-shaped groove. The second alignment structure includes a second arc-shaped groove disposed on the third surface. The second arc-shaped groove is opposite to the first arc-shaped groove along the first direction. The second arc-shaped groove and the first arc-shaped groove together enclose an installation chamber. The installation chamber is filled with a refractive medium to obtain a second arc-shaped focusing lens. The second arc-shaped focusing lens is used to receive the first alignment light source and to refract the first alignment light source to obtain the second alignment light source traveling along the second alignment optical path. The second alignment light source is emitted from the second arc-shaped groove.

8. The display optical module according to claim 7, characterized in that, The preset conditions include: ① ② ③ in, As a preset value, Let be the focal length of the first aligned light source. The focal length of the second corresponding light source. The refractive index of air, Let be the refractive index of the first arc-shaped focusing lens and the first moving platform. Let be the refractive index of the second arc-shaped focusing lens. Let be the radius of curvature of the first arc-shaped focusing lens. Let be the radius of curvature of the first arc-shaped groove. Let be the radius of curvature of the second arc-shaped groove. The distance from the highest point of the first arc-shaped focusing lens to the lowest point of the first arc-shaped groove along the first direction. The distance is the distance from the lowest point of the first arc-shaped groove to the lowest point of the second arc-shaped groove along the first direction.

9. The display optical module according to claim 7, characterized in that, The refractive medium includes liquid optical adhesive.

10. The display optical module according to claim 7, characterized in that, The first alignment structure includes at least two, and the at least two first alignment structures are arranged at circumferential intervals along the first moving platform; The second alignment structure includes at least two, and the at least two second alignment structures are arranged at circumferential intervals along the second moving platform; Each of the first alignment structures corresponds to a second alignment structure that is opposite to it along the first direction.

11. A display device, characterized in that, The display optical module includes any one of claims 1-10.

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