Optical device, optical module and display device

Abstract

The utility model discloses an optical device, an optical module and a display device. The optical device comprises a light-transmitting substrate and a plurality of light blocking units. The light-transmitting substrate is provided with an outer side surface and an inner side surface, and the inner side surface is used for receiving leaked light generated by the imaging assembly. The light blocking units are arranged in the light-transmitting substrate in an array mode, each light blocking unit comprises a filtering film layer, the included angle between the filtering film layer and the inner side surface is an acute angle, the filtering film layer is used for reflecting leaked light rays so as to prevent the leaked light rays from being emitted from the outer side surface, and the filtering film layer is further used for transmitting environment light rays incident from the outer side surface. Therefore, when leaked light rays generated by the imaging assembly are emitted to the outside, the plurality of filtering film layers corresponding to the plurality of light blocking units can reflect the leaked light rays incident from the inner side surface so as to change the propagation direction of the leaked light rays and further prevent the leaked light rays from being emitted to the outside from the outer side surface.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and more specifically, to an optical device, an optical module and a display apparatus. Background Art

[0002] With the rapid development of augmented reality (AR) display technology, head-mounted AR devices (eg, smart AR glasses) have become a hot research and development target.

[0003] In existing AR devices, an imaging solution is usually adopted that combines an optical engine with an optical combiner (e.g., optical waveguide, coaxial air guide), wherein the optical engine is used to generate light carrying image information, and the optical combiner is used to transmit the light to the user's eyes.

[0004] However, existing optical combiners have light leakage. Specifically, when light is transmitted in the optical combiner, part of the light will leak to the outside world, so that people outside can see the image generated in the AR device through the leaked light, thereby reducing the privacy of the user when using the AR device. Utility Model Content

[0005] Embodiments of the present application provide an optical device, an optical module, and a display device.

[0006] According to the first aspect of the present application, an embodiment of the present application provides an optical device, which is applied to a display device provided with an imaging component, and the optical device includes a light-transmitting substrate and a plurality of light-blocking units. The light-transmitting substrate has an outer surface and an inner surface that are opposite to each other, and the inner surface is used to receive the leaked light generated by the imaging component. An array of multiple light-blocking units is arranged in the light-transmitting substrate; the light-blocking unit includes a filter film layer, and the angle between the filter film layer and the inner surface is an acute angle. The filter film layer is used to reflect the leaked light to prevent the leaked light from emitting through the outer surface, and the filter film layer is also used to transmit the ambient light incident from the outer surface.

[0007] In some possible embodiments, the leaked light is a three-color laser mixed with red laser, green laser and blue laser. The filter film layer is used to reflect the light of the spectrum corresponding to the red laser, green laser and blue laser; and transmit the light of the visible spectrum except the spectrum corresponding to the red laser, green laser and blue laser.

[0008] Among them, in some possible embodiments, the filter film layer has a first reflection spectrum band, a second reflection spectrum band and a third reflection spectrum band, and the spectral width of the first reflection spectrum band, the spectral width of the second reflection spectrum band and the spectral width of the third reflection spectrum band are all greater than or equal to 10nm, and are all less than or equal to 20nm. The spectrum band interval where the red laser is located belongs to the first reflection spectrum band, the spectrum band interval where the green laser is located belongs to the second reflection spectrum band, and the spectrum band interval where the blue laser is located belongs to the third reflection spectrum band.

[0009] In some possible embodiments, the light blocking unit further includes an absorption film layer, the angle between the absorption film layer and the filter film layer is an acute angle, and the absorption film layer is located on the optical path of the leaked light after being reflected by the filter film layer, and is used to absorb the leaked light.

[0010] In some possible embodiments, the light-transmitting substrate includes a plurality of light-transmitting units corresponding to the plurality of light-blocking units, and the plurality of light-transmitting units are arranged in an array to jointly define an outer surface and an inner surface. The filter film layer is arranged in the corresponding light-transmitting unit; the absorption film layer is arranged on a designated surface of the corresponding light-transmitting unit, and the designated surface and the inner surface are not coplanar.

[0011] In some possible embodiments, the light-transmitting unit includes a first light-transmitting member and a second light-transmitting member, the first light-transmitting member and the second light-transmitting member are bonded to each other, the filter film layer is arranged between two bonding surfaces of the first light-transmitting member and the second light-transmitting member, and the absorption film layer is arranged on a side of the first light-transmitting member away from the second light-transmitting member.

[0012] Among them, in some possible embodiments, multiple filter film layers of multiple light-blocking units are parallel to each other, and multiple absorption film layers of multiple light-blocking units are parallel to each other; or, multiple light-blocking units are divided into two groups, and the two groups of light-blocking units are symmetrical about the central axis of the light-transmitting substrate; the structures of multiple light-blocking units in each group of light-blocking units are the same, and the multiple light-blocking units in each group of light-blocking units are arranged in an array; or, two adjacent filter film layers in the multiple light-blocking units intersect, and the multiple absorption film layers of the multiple light-blocking units are parallel to each other; or, multiple light-blocking units are divided into two groups, and the two groups of light-blocking units are symmetrical about the central axis of the light-transmitting substrate; the structures of multiple light-blocking units in each group of light-blocking units are different, and the angle between the absorption film layer of multiple light-blocking units in each group of light-blocking units and the inner surface follows: the angle gradually decreases in the direction from the central axis to the side of the light-transmitting substrate.

[0013] In some possible embodiments, the angle between the filter film layer and the inner surface is greater than or equal to 30 degrees and less than or equal to 60 degrees. The angle between the absorption film layer and the inner surface is greater than or equal to 80 degrees and less than or equal to 90 degrees.

[0014] In some possible embodiments, the outer surface and the inner surface are planes; or, the outer surface and the inner surface are curved surfaces, and the light-transmitting substrate is a myopia lens or a presbyopia lens.

[0015] According to the second aspect of the present application, an embodiment of the present application further provides an optical module, which includes an imaging component and the above-mentioned optical device. The imaging component is used to generate a designated light carrying image information and guide the designated light to a designated area. The optical device is arranged on a side of the imaging component away from the designated area to prevent leakage light from emitting to the outside, and the leakage light is part of the designated light.

[0016] In some possible embodiments, the imaging assembly includes a laser optical machine and an optical combiner, wherein the laser optical machine is used to generate a designated light. The optical combiner is arranged on an optical path where the designated light is located, and is used to guide the designated light to a designated area. The optical combiner includes an optical waveguide, the designated area is an outcoupling area of ​​the optical waveguide, and the optical device is arranged on the surface of the optical waveguide.

[0017] According to a third aspect of the present application, an embodiment of the present application further provides a display device, which includes a housing and the above-mentioned optical module, and the optical module is arranged in the housing.

[0018] The embodiments of the present application provide an optical device, an optical module, and a display device. The optical device is applied to a display device provided with an imaging component, and the optical device may include a light-transmitting substrate and a plurality of light-blocking units. Specifically, the light-transmitting substrate has an outer surface and an inner surface that are opposite to each other, and the inner surface is used to receive the leaked light generated by the imaging component. An array of multiple light-blocking units is arranged in the light-transmitting substrate, wherein the light-blocking unit includes a filter film layer, and the angle between the filter film layer and the inner surface is an acute angle. The filter film layer is used to reflect the leaked light to prevent the leaked light from emitting through the outer surface, and the filter film layer is also used to transmit the ambient light incident from the outer surface.

[0019] Therefore, when the leakage light generated by the imaging component is emitted to the outside, the multiple filter film layers corresponding to the multiple light-blocking units can reflect the leakage light incident through the inner surface to change the propagation direction of the leakage light, thereby preventing the leakage light from being emitted to the outside through the outer surface.

[0020] Specifically, when the optical device is applied to an AR device, the presence of the optical device can prevent people outside from seeing the images generated in the AR device through leaked light, thereby ensuring the privacy of the user when using the AR device. In addition, the filter film layer is also used to transmit ambient light incident from the outer surface to ensure that the ambient light from the outside can smoothly pass through the optical device and enter the eyes of the user wearing the AR device, ensuring that the AR device can work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the display device provided in an embodiment of the present application.

[0023] Figure 2 yes Figure 1 A schematic structural diagram of an optical module in a display device is shown.

[0024] Figure 3 yes Figure 2 A schematic diagram of the first structure of the optical device in the optical module is shown.

[0025] Figure 4 yes Figure 2 A second schematic diagram of the structure of the optical device in the optical module is shown.

[0026] Figure 5 yes Figure 2 A third structural schematic diagram of the optical device in the optical module shown.

[0027] Figure 6 yes Figure 2 A fourth structural schematic diagram of the optical device in the optical module shown.

[0028] Figure 7 yes Figure 2 A fifth structural schematic diagram of the optical device in the optical module is shown.

[0029] Figure 8 yes Figure 2 A sixth structural schematic diagram of the optical device in the optical module is shown. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0031] See also Figure 1In an embodiment of the present application, a display device 10 is provided. The display device 10 may be an augmented reality (AR) device. An AR device is a device that mixes the real world and the virtual world. On the one hand, a user can view the real environment of the outside world through the AR device; on the other hand, a user can also view the projected image generated by the AR device through the AR device. Specifically, the AR device may be AR glasses, an AR helmet, and the like.

[0032] In this embodiment, the display device 10 may include a housing 200 and an optical module 300, and the optical module 300 is disposed in the housing 200. For example, a mounting cavity (not shown in the figure) may be provided in the housing 200, and the optical module 300 is disposed in the mounting cavity, so that the housing 200 plays a role in fixing and protecting the optical module 300.

[0033] The optical module 300 is used to generate a designated light D carrying image information, and transmit the designated light D to the eyes of a user wearing the display device 10, so that the user can see the projected image generated by the display device 10. Figure 2 , the optical module 300 may include an imaging component 320 and an optical device 340. The imaging component 320 is used to generate a designated light D carrying image information and guide the designated light D to a designated area. The "designated area" here refers to the area where the imaging component 320 is used to couple out light.

[0034] In some possible embodiments, the imaging assembly 320 may include a laser light machine 3210 and a light combiner 3230. The laser light machine 3210 is disposed in the mounting cavity and is used to generate a designated light D. The laser light machine 3210 refers to a light machine using a laser as a light source, that is, the designated light D in this embodiment is a laser, which has the characteristic of a small expansion amount, so that the designated light D can be more smoothly coupled into the subsequent optical path element (for example, an optical waveguide). In addition, since the designated light D is a laser, it also has the advantages of good monochromaticity, high color saturation, and a large color gamut, which can improve the imaging quality of the display device 10.

[0035] Specifically, the designated light D may be a three-color laser mixed with a red laser, a green laser, and a blue laser. The spectrum width of the red laser, the spectrum width of the green laser, and the spectrum width of the blue laser are all less than or equal to 10 nm. The half-width of the red laser, the half-width of the green laser, and the half-width of the blue laser are all greater than or equal to 1 nm and less than or equal to 2 nm.

[0036] The optical combiner 3230 is arranged on the optical path where the designated light D is located, and is used to guide the designated light D to the designated area. Specifically, the optical combiner 3230 can be implemented by structures such as optical waveguides, coaxial birdbaths, etc., which are not limited in this embodiment. Exemplarily, when the optical combiner 3230 includes an optical waveguide, the designated area is the outcoupling area of ​​the optical waveguide, and the designated light D is coupled out through the outcoupling area of ​​the optical waveguide and then incident on the user's eyes. It should be noted here that in the actual operation of the optical combiner 3230, there is a leakage phenomenon of the designated light D, that is, most of the designated light D will be emitted toward the designated area to be incident on the user's eyes. And a small part of the designated light D will be emitted away from one side of the designated area to form a leakage light L to be emitted to the outside.

[0037] In order to solve the problem of leakage light L being emitted to the outside, the present embodiment is provided with an optical device 340 in the optical module 300. The optical device 340 is provided on the side of the imaging component 320 away from the designated area to prevent the leakage light L from being emitted to the outside, wherein the leakage light L is part of the designated light D. Specifically, the optical device 340 can be attached to the side of the optical combiner 3230 away from the designated area to improve the connection stability of the optical device 340. Exemplarily, in the case where the optical combiner 3230 includes an optical waveguide, the optical device 340 can be provided on the surface of the optical waveguide away from the outcoupling area. The optical device 340 can also be spaced apart from the optical combiner 3230 and connected to the housing 200 to facilitate the maintenance and replacement of the optical device 340.

[0038] See also Figure 3 , the optical device 340 may include a light-transmitting substrate 40 and a plurality of light-blocking units 50. The light-transmitting substrate 40 has an outer surface 410 and an inner surface 430 that are opposite to each other, and the inner surface 430 is used to receive the leakage light L generated by the imaging component 320, that is, the leakage light L is incident into the light-transmitting substrate 40 through the inner surface 430. The plurality of light-blocking units 50 are arranged in an array in the light-transmitting substrate 40, wherein the light-blocking unit 50 may include a filter film layer 520, wherein the angle between the filter film layer 520 and the inner surface 430 is an acute angle, and the filter film layer 520 is used to reflect the leakage light L to prevent the leakage light L from emitting through the outer surface 410, and the filter film layer 520 is also used to transmit the ambient light incident from the outer surface 410.

[0039] Therefore, when the leakage light L generated by the imaging component 320 is emitted to the outside, the multiple filter film layers 520 corresponding to the multiple light blocking units 50 can reflect the leakage light L incident through the inner surface 430 to change the propagation direction of the leakage light L, thereby preventing the leakage light L from being emitted to the outside through the outer surface 410.

[0040] Specifically, when the optical device 340 is applied to an AR device, the presence of the optical device 340 can prevent people outside from seeing the image generated in the AR device through the leaked light L, thereby ensuring the privacy of the user when using the AR device. In addition, the filter film layer 520 is also used to transmit the ambient light E incident from the outer surface 410 to ensure that the ambient light E from the outside can smoothly pass through the optical device 340 and enter the eyes of the user wearing the AR device, ensuring that the AR device can work normally.

[0041] The specific structure of the optical device 340 is introduced below.

[0042] In this embodiment, the light-transmitting substrate 40 is generally in a transparent sheet-like structure to transmit light, and the light-transmitting substrate 40 can play a role in fixing the multiple light-blocking units 50. Specifically, the light-transmitting substrate 40 can have an outer surface 410 and an inner surface 430 that are opposite to each other, wherein the inner surface 430 can be spaced apart from the side of the light combiner 3230 that is opposite to the designated area, or can be attached to the side of the light combiner 3230 that is opposite to the designated area, so that the leakage light L generated by the light combiner 3230 can smoothly enter the optical device 340. The outer surface 410 is arranged on the side facing the outside to receive the ambient light E incident from the outside.

[0043] In some possible embodiments, the outer surface 410 and the inner surface 430 are planes, and the outer surface 410 and the inner surface 430 are substantially parallel. Therefore, the light-transmitting substrate 40 is substantially flat, which can ensure that the ambient light E will not be dispersed when passing through the optical device 340, so that the user wearing the display device 10 can normally view the real environment of the outside world.

[0044] In some other possible embodiments, see Figure 4 , the outer surface 410 and the inner surface 430 are curved surfaces, and the light-transmitting substrate 40 is a myopia lens or a presbyopic lens. Specifically, the light-transmitting substrate 40 can be customized according to the user's vision. In other words, the surface parameters (e.g., the radius of curvature) of the outer surface 410 and the inner surface 430 can be determined by the user's vision. Therefore, when the user wears the display device 10, there is no need to wear additional myopia glasses or presbyopic glasses, thereby increasing the user's wearing comfort.

[0045] In this embodiment, the light-transmitting substrate 40 may include a plurality of light-transmitting units 450 corresponding to the plurality of light-blocking units 50 one by one, and the plurality of light-transmitting units 450 are arranged in an array to jointly define the outer surface 410 and the inner surface 430. The "array arrangement" here may be an M*1 arrangement or an M*N arrangement. Each light-blocking unit 50 is arranged on the corresponding light-transmitting unit 450, and the light-transmitting unit 450 serves to fix the light-blocking unit 50.

[0046] Specifically, the light-transmitting unit 450 may include a first light-transmitting member 4520 and a second light-transmitting member 4540, and the first light-transmitting member 4520 and the second light-transmitting member 4540 are attached to each other. Figure 3 In the illustrated embodiment, the first light-transmitting member 4520 and the second light-transmitting member 4540 can be right-angled prisms respectively, and the two right-angled prisms have the same shape, and the planes where the hypotenuses are located are in contact with each other. Figure 4 In the illustrated embodiment, the first light-transmitting member 4520 and the second light-transmitting member 4540 may be two irregularly shaped prisms, and one surface of the prisms is a curved surface. In some other possible embodiments, the first light-transmitting member 4520 and the second light-transmitting member 4540 may also be prisms of other shapes, which is not limited in this embodiment.

[0047] The plurality of light blocking units 50 are arranged in a one-to-one correspondence with the plurality of light transmitting units 450. Since the plurality of light transmitting units 450 are arranged in an array, the plurality of light blocking units 50 are also arranged in an array. The light blocking unit 50 may include a filter film layer 520, and the angle between the filter film layer 520 and the inner surface 430 is an acute angle. It is not difficult to understand here that when the inner surface 430 is a curved surface, "the angle between the filter film layer 520 and the inner surface 430" should be understood as the angle between the tangent plane at the connection point between the inner surface 430 and the filter film layer 520 and the plane where the filter film layer 520 is located.

[0048] In this embodiment, the filter film layer 520 is a bandpass filter film layer, which is used to reflect the leaked light L and transmit the ambient light E. Specifically, the leaked light L can be a three-color laser mixed with red laser, green laser and blue laser. Then the filter film layer 520 is used to reflect the light of the spectrum corresponding to the red laser, green laser and blue laser, and transmit the light of the visible spectrum except the spectrum corresponding to the red laser, green laser and blue laser. Since the spectrum of the laser is narrow, when the ambient light E is incident on the filter film layer 520, only a very small part of the ambient light E will be reflected by the filter film layer 520, and most of the ambient light E can be transmitted through the filter film layer 520, so as to ensure that the user can smoothly view the real environment of the outside world.

[0049] In some possible embodiments, the filter film layer 520 has a first reflection spectrum, a second reflection spectrum and a third reflection spectrum. The spectral width of the first reflection spectrum, the spectral width of the second reflection spectrum and the spectral width of the third reflection spectrum are all greater than or equal to 10nm, and are all less than or equal to 20nm. The spectrum interval where the red laser is located belongs to the first reflection spectrum, the spectrum interval where the green laser is located belongs to the second reflection spectrum, and the spectrum interval where the blue laser is located belongs to the third reflection spectrum. Here, taking the spectrum interval where the red laser is located as 648nm to 652nm, the spectrum interval where the green laser is located as 530nm to 534nm, and the spectrum interval where the blue laser is located as 471nm to 475nm as an example, the first reflection spectrum can be 643nm to 657nm, the second reflection spectrum can be 525nm to 539nm, and the third reflection spectrum can be 466nm to 480nm. Therefore, the red laser, green laser and blue laser contained in the leakage light L can be fully reflected by the filter film layer 520 to prevent the leakage light L from being emitted to the outside.

[0050] In some possible embodiments, the light blocking unit 50 may further include an absorption film layer 540, the angle between the absorption film layer 540 and the filter film layer 520 is an acute angle, and is located on the optical path where the leakage light L after being reflected by the filter film layer 520 is located, and is used to absorb the leakage light L. Since the leakage light L is reflected by the filter film layer 520, it may be reflected to the user's eyes, thereby causing the "artifact" phenomenon. Therefore, in this embodiment, by setting the absorption film layer 540 on the optical path where the leakage light L after reflection is located, the leakage light L can be absorbed to avoid the "artifact" phenomenon, thereby ensuring the user's experience. Specifically, the absorption film layer 540 can be a black absorption film.

[0051] Of course, in some possible situations, the leakage light L emitted by the light combiner 3230 is directly incident on the absorption film layer 540 after passing through the inner surface 430 and is absorbed by the absorption film layer 540 .

[0052] Specifically, the filter film layer 520 is disposed in the corresponding light-transmitting unit 450, and the absorption film layer 540 is disposed on a designated surface of the corresponding light-transmitting unit 450, where the "designated surface" is not coplanar with the inner surface 430. Please refer to Figure 3 The filter film layer 520 is specifically disposed between the two bonding surfaces of the first light-transmitting member 4520 and the second light-transmitting member 4540, and the absorption film layer 540 is disposed on the side of the first light-transmitting member 4520 away from the second light-transmitting member 4540. The angle between the filter film layer 520 and the inner surface 430 is greater than or equal to 30 degrees and less than or equal to 60 degrees. The angle between the absorption film layer 540 and the inner surface 430 is greater than or equal to 80 degrees and less than or equal to 90 degrees.

[0053] In some possible embodiments, the angle between the filter film layer 520 and the inner surface 430 is equal to 45 degrees, and the angle between the absorption film layer 540 and the inner surface 430 is equal to 90 degrees. At this time, the cross-sections of the first light-transmitting member 4520 and the second light-transmitting member 4540 are two isosceles right triangles, respectively. When the external ambient light E passes through the optical device 340, the field of view angle of the ambient light E can reach ±45 degrees.

[0054] In some other possible embodiments, Figure 5 As shown, the angle between the filter film layer 520 and the inner surface 430 is greater than or equal to 30 degrees and less than 45 degrees, and the angle between the absorption film layer 540 and the inner surface 430 is equal to 90 degrees. At this time, the cross-sections of the first light-transmitting member 4520 and the second light-transmitting member 4540 are two non-isosceles right triangles. Figure 3 The illustrated embodiment can further increase the viewing angle of the ambient light E. For example, when the angle between the filter film layer 520 and the inner surface 430 is equal to 30 degrees, the viewing angle of the ambient light E can reach ±60 degrees.

[0055] In some other possible embodiments, the angle between the filter film layer 520 and the inner surface 430 is greater than 45 degrees and less than or equal to 60 degrees, and the angle between the absorption film layer 540 and the inner surface 430 is equal to 90 degrees. In this case, the cross-sections of the first light-transmitting member 4520 and the second light-transmitting member 4540 are two non-isosceles right triangles. Figure 3 In the illustrated embodiment, the angle between the filter film layer 520 and the inner surface 430 is further increased to ensure that the leaked light L is fully reflected to the absorption film layer 540, thereby preventing the leaked light L from being reflected back to the human eye and causing artifacts.

[0056] Please refer again Figure 3 In some possible embodiments, the multiple filter film layers 520 of the multiple light blocking units 50 are parallel to each other, the multiple absorption film layers 540 of the multiple light blocking units 50 are parallel to each other, and the filter film layers 520 and the absorption film layers 540 are arranged alternately in sequence. Therefore, when assembling the optical device 340, the first light-transmitting member 4520, the second light-transmitting member 4540, the filter film layer 520 and the absorption film layer 540 can be assembled into a single optical sub-device first, and then the multiple optical sub-devices can be fixed in a certain arrangement, so that the assembly process of the optical device 340 is simpler.

[0057] See also Figure 6In some other possible embodiments, the plurality of light blocking units 50 are divided into two groups, and the two groups of light blocking units 50 are symmetrical about the central axis M of the transparent substrate 40. The plurality of light blocking units 50 in each group of light blocking units 50 have the same structure, and the plurality of light blocking units 50 in each group of light blocking units 50 are arranged in an array. The extension direction of the central axis M can be consistent with the line of sight of the user's eyes when looking straight ahead, so that the leakage light L emitted away from the user's eyes can be reflected along both sides of the central axis M under the action of the plurality of filter film layers 520, so as to avoid the leakage light L from being reflected back to the area where the human eyes are located.

[0058] Specifically, in Figure 6 In the illustrated embodiment, the filter film layers 520 in each group of light-blocking units 50 are parallel to each other, and the angle between the filter film layers 520 and the inner surface 430 is equal to 45 degrees. The absorption film layers 540 in each group of light-blocking units 50 are parallel to each other, and the angle between the absorption film layers 540 and the inner surface 430 is equal to 90 degrees. Therefore, the symmetrical filter film layers 520 located on both sides of the central axis M are orthogonally arranged.

[0059] See also Figure 7 In some other possible embodiments, two adjacent filter film layers 520 in the plurality of light blocking units 50 intersect, and the plurality of absorption film layers 540 of the plurality of light blocking units 50 are parallel to each other. Specifically, the angle between the filter film layer 520 and the inner surface 430 can be equal to 45 degrees, that is, the angle between the two adjacent filter film layers 520 is 90 degrees, and the planes where the two are located are orthogonal. The angle between the absorption film layer 540 and the inner surface 430 can be equal to 90 degrees. Therefore, in the Figure 7 When assembling the optical device 340, a single optical sub-unit can be assembled first, the two filter film layers 520 included in the optical sub-unit intersect, and then the multiple optical sub-units are fixed in a certain arrangement, so that the assembly process of the optical device 340 is simpler.

[0060] See also Figure 8 In some other possible embodiments, the plurality of light-blocking units 50 are divided into two groups, and the two groups of light-blocking units 50 are symmetrical about the central axis M of the light-transmitting substrate 40. The structures of the plurality of light-blocking units 50 in each group of light-blocking units 50 are different, and the angle between the absorption film layer 540 of the plurality of light-blocking units 50 in each group of light-blocking units 50 and the inner surface 430 follows: the angle gradually decreases in the direction from the central axis M to the side of the light-transmitting substrate 40. The extension direction of the central axis M is consistent with the line of sight of the user's eyes when looking straight ahead, and the extension direction of each absorption film layer 540 is roughly parallel to the line of sight of the user's eyes when looking straight ahead. Therefore, in this case, the optical device 340 can greatly expand the field of view of the user to observe the outside world and reduce the probability of the leakage light L being reflected to the user's eyes.

[0061] The embodiment of the present application provides an optical device 340, an optical module 300 equipped with the optical device 340, and a display device 10 equipped with the optical module 300. The optical device 340 may include a light-transmitting substrate 40 and a plurality of light-blocking units 50. The light-transmitting substrate 40 has an outer surface 410 and an inner surface 430 that are opposite to each other, and the inner surface 430 is used to receive the leakage light L generated by the imaging component 320. The plurality of light-blocking units 50 are arranged in an array in the light-transmitting substrate 40, wherein the light-blocking unit 50 may include a filter film layer 520, wherein the angle between the filter film layer 520 and the inner surface 430 is an acute angle, and the filter film layer 520 is used to reflect the leakage light L to prevent the leakage light L from emitting through the outer surface 410, and the filter film layer 520 is also used to transmit the ambient light incident from the outer surface 410.

[0062] Therefore, when the leakage light L generated by the imaging component 320 is emitted to the outside, the multiple filter film layers 520 corresponding to the multiple light blocking units 50 can reflect the leakage light L incident through the inner surface 430 to change the propagation direction of the leakage light L, thereby preventing the leakage light L from being emitted to the outside through the outer surface 410.

[0063] Specifically, when the optical device 340 is applied to an AR device, the presence of the optical device 340 can prevent people outside from seeing the image generated in the AR device through the leaked light L, thereby ensuring the privacy of the user when using the AR device. In addition, the filter film layer 520 is also used to transmit the ambient light E incident from the outer surface 410 to ensure that the ambient light E from the outside can smoothly pass through the optical device 340 and enter the eyes of the user wearing the AR device, ensuring that the AR device can work normally.

[0064] In the specification of this application, certain words are used to refer to specific components in the specification and claims. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0065] In the description of the present application, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", and "inside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present application. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0066] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be internal communication between two elements, or it can be only surface contact. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical device, characterized in that: Applicable to a display device provided with an imaging component, the optical device comprises a light-transmitting substrate and a plurality of light-blocking units; The light-transmitting substrate has an outer surface and an inner surface which are opposite to each other, and the inner surface is used to receive the leaked light generated by the imaging component; A plurality of light-blocking unit arrays are arranged in the light-transmitting substrate; the light-blocking unit includes a filter film layer, the angle between the filter film layer and the inner surface is an acute angle, the filter film layer is used to reflect the leaked light to prevent the leaked light from being emitted through the outer surface, and the filter film layer is also used to transmit ambient light incident from the outer surface.

2. The optical device according to claim 1, characterized in that The leaked light is a three-color laser mixed with red laser, green laser and blue laser; The filter film layer is used to reflect the light in the spectrum bands corresponding to the red laser, the green laser and the blue laser; and transmit the light in the visible spectrum band except the spectrum bands corresponding to the red laser, the green laser and the blue laser.

3. The optical device according to claim 2, characterized in that: The filter film layer has a first reflection spectrum band, a second reflection spectrum band and a third reflection spectrum band, and the spectral width of the first reflection spectrum band, the spectral width of the second reflection spectrum band and the spectral width of the third reflection spectrum band are all greater than or equal to 10nm and less than or equal to 20nm; The spectrum range where the red laser is located belongs to the first reflection spectrum range, the spectrum range where the green laser is located belongs to the second reflection spectrum range, and the spectrum range where the blue laser is located belongs to the third reflection spectrum range.

4. The optical device according to any one of claims 1 to 3, characterized in that: The light blocking unit further includes an absorption film layer, the angle between the absorption film layer and the filter film layer is an acute angle, and the absorption film layer is located on the optical path of the leaked light after being reflected by the filter film layer, and is used to absorb the leaked light.

5. The optical device according to claim 4, characterized in that: The light-transmitting substrate comprises a plurality of light-transmitting units corresponding to the plurality of light-blocking units one by one, and the plurality of light-transmitting units are arranged in an array to jointly define the outer surface and the inner surface; The filter film layer is arranged in the corresponding light-transmitting unit; the absorption film layer is arranged on a designated surface of the corresponding light-transmitting unit, and the designated surface and the inner surface are not coplanar.

6. The optical device according to claim 5, characterized in that: The light-transmitting unit comprises a first light-transmitting member and a second light-transmitting member, wherein the first light-transmitting member and the second light-transmitting member are attached to each other; The filter film layer is arranged between two bonding surfaces of the first light-transmitting member and the second light-transmitting member, and the absorption film layer is arranged on a side of the first light-transmitting member facing away from the second light-transmitting member.

7. The optical device according to claim 5, characterized in that: The plurality of filter film layers of the plurality of light-blocking units are parallel to each other, and the plurality of absorption film layers of the plurality of light-blocking units are parallel to each other; or The plurality of light-blocking units are divided into two groups, and the two groups of light-blocking units are symmetrical about the central axis of the light-transmitting substrate; the plurality of light-blocking units in each group of light-blocking units have the same structure, and the plurality of light-blocking units in each group of light-blocking units are arranged in an array; or Two adjacent filter film layers in the plurality of light-blocking units intersect, and the plurality of absorption film layers in the plurality of light-blocking units are parallel to each other; or The multiple light-blocking units are divided into two groups, and the two groups of light-blocking units are symmetrical about the central axis of the light-transmitting substrate; the multiple light-blocking units in each group of the light-blocking units have different structures, and the angles between the absorption film layers of the multiple light-blocking units in each group of the light-blocking units and the inner surface follow: the angle gradually decreases in the direction from the central axis to the side of the light-transmitting substrate.

8. The optical device according to claim 4, characterized in that: The angle between the filter film layer and the inner surface is greater than or equal to 30 degrees and less than or equal to 60 degrees; The angle between the absorption film layer and the inner surface is greater than or equal to 80 degrees and less than or equal to 90 degrees.

9. The optical device according to any one of claims 1 to 3, characterized in that: The outer surface and the inner surface are plane; or The outer surface and the inner surface are curved surfaces, and the light-transmitting substrate is a myopia lens or a presbyopia lens.

10. An optical module, characterized in that: include: An imaging component, used to generate a designated light beam carrying image information and guide the designated light beam to a designated area; as well as The optical device according to any one of claims 1 to 9, wherein the optical device is arranged on a side of the imaging component away from the designated area to prevent leakage light from emitting to the outside, wherein the leakage light is part of the designated light.

11. The optical module according to claim 10, characterized in that: The imaging assembly includes a laser light machine and a light combiner, wherein the laser light machine is used to generate the specified light; The optical combiner is arranged on the optical path where the designated light is located, and is used to guide the designated light to the designated area; the optical combiner includes an optical waveguide, the designated area is the outcoupling area of ​​the optical waveguide, and the optical device is arranged on the surface of the optical waveguide.

12. A display device, characterized in that: include: case; as well as The optical module according to claim 11, wherein the optical module is disposed in the housing.

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