Optical energy transmission detection device of waveguide

Abstract

The utility model discloses a waveguide light energy transmission detection device, and the device comprises an optical machine which is used for emitting a first light beam; the first diaphragm is used for reducing the spot size of the first light beam and forming a second light beam to be projected to the coupling-in area; the light energy detection module is used for detecting light beam energy of the second light beam coupled into the waveguide and light beam energy of the third light beam coupled out of the coupling-out area. The first diaphragm is arranged at the light emitting position of the light machine to reduce the size of the light beam emitted by the light machine, so that when the exit pupil size of the light machine is not matched with the size of the coupling-in area, the second light beam projected to the coupling-in area can cover the coupling-in area after being processed; therefore, by detecting the light beam energy of the second light beam coupled into the waveguide and the light beam energy of the third light beam coupled out of the area, compatibility of optical performance detection of different waveguides can be achieved, and the detection cost of the waveguide is reduced.

Description

Technical Field

[0001] The present application relates to the field of optical detection, and in particular to a waveguide light energy transmission detection device. Background Art

[0002] With the development of display technology, virtual display devices such as augmented reality glasses and virtual reality glasses are becoming more and more popular. Waveguides and optical machines are the main optical devices that make up virtual display devices. After the optical machine emits a light beam used to form a virtual image, the virtual display device can transmit the virtual image through the waveguide and project it in front of the user to form a virtual image. Since the optical performance of the waveguide has an important influence on the final display effect of the virtual display device, the optical parameters of the waveguide in different application scenarios are different. At present, when testing the optical performance of the waveguide under different optical parameters, it is necessary to design the corresponding optical machine, resulting in a high cost for waveguide testing. Utility Model Content

[0003] The present application proposes a waveguide light energy transmission detection device, wherein the waveguide is provided with a coupling-in area and a coupling-out area, and the waveguide light energy transmission detection device comprises: an optical machine, used to emit a first light beam; a first aperture, arranged at the light output of the optical machine, the first aperture is used to reduce the spot size of the first light beam, and form a second light beam to be projected to the coupling-in area; a light energy detection module, the light energy detection module is used to detect the beam energy of the second light beam coupled into the waveguide, and the beam energy of the third light beam coupled out from the coupling-out area.

[0004] Optionally, the waveguide light energy transmission detection device also includes a second aperture, which is arranged at the light entrance of the coupling area, the aperture shape of the second aperture is the same as the shape of the coupling area, and the aperture size of the second aperture matches the size of the coupling area.

[0005] Optionally, the exit pupil size of the optical machine is larger than the size of the coupling area, the aperture shape of the first aperture is the same as the shape of the coupling area, and the aperture size of the first aperture matches the size of the coupling area, and the beam center of the second light beam in the coupling area coincides with the center of the coupling area.

[0006] Optionally, the exit pupil size of the optical machine is smaller than the size of the coupling area, and the waveguide light energy transmission detection device also includes a displacement stage; the displacement stage is mechanically connected to the optical machine, and the displacement stage is used to drive the optical machine to move multiple times in the first plane, so that the light spot formed by the second light beam in the coupling area gradually covers the coupling area, the first plane is parallel to the plane where the coupling area is located, and after each movement, the light spots formed by the second light beam at different positions in the coupling area do not overlap.

[0007] Optionally, the field of view angle of the optical machine is smaller than the field of view angle of the waveguide, and the light energy transmission detection device of the waveguide also includes a rotating mechanism; the rotating mechanism is mechanically connected to the optical machine, and the rotating mechanism is used to drive the optical machine to rotate multiple times so that the optical machine projects the second light beam with an incident angle of a target angle to the coupling area, and the target angle matches the field of view angle of the waveguide.

[0008] Optionally, the light energy detection module includes a first detection unit and a second detection unit; the first detection unit is arranged between the second aperture and the coupling-in area, and the first detection unit is used to collect the second light beam coupled into the coupling-in area, and detect the beam energy of the second light beam; the second detection unit is arranged in the beam output direction of the coupling-out area, and the second detection unit is used to collect the third light beam emitted from the coupling-out area, and detect the beam energy of the third light beam.

[0009] Optionally, the light energy detection module further includes a transmission efficiency analysis unit, which is electrically connected to the first detection unit and the second detection unit, respectively, and is used to receive beam energies of the second light beam and the third light beam.

[0010] Optionally, the first detection unit and the second detection unit are at least one of a luminance meter, an integrating sphere and a power meter.

[0011] Optionally, the aperture shape of the first aperture is at least one of circular, rectangular and square.

[0012] Optionally, the optical machine is at least one of a spatial light modulation optical machine, a liquid crystal optical machine and a light emitting semiconductor optical machine.

[0013] The optical energy transmission detection device of the waveguide provided in the embodiment of the present application includes: an optical machine, which is used to emit a first light beam; a first aperture, which is arranged at the light exit of the optical machine, and the first aperture is used to reduce the spot size of the first light beam, and form a second light beam to be projected into the coupling region; and an optical energy detection module, which is used to detect the beam energy of the second light beam coupled into the waveguide, and the beam energy of the third light beam coupled out of the coupling region. Based on this, by arranging the first aperture for reducing the spot size of the second light beam projected by the optical machine into the coupling region at the light exit of the optical machine, when the exit pupil size of the optical machine does not match the size of the coupling region, the second light beam projected into the coupling region can cover the coupling region after processing, thereby detecting the second light beam coupled into the waveguide and the beam energy of the third light beam emitted from the coupling region, the optical performance of the waveguide is detected when the exit pupil size of the optical machine does not match the size of the coupling region, thereby improving the compatibility of the optical energy transmission detection device of the waveguide for optical performance detection of the waveguide under different optical parameters, and reducing the detection cost when detecting the waveguide.

[0014] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 A schematic structural diagram of a waveguide light energy transmission detection device provided in an embodiment of the present application is shown.

[0017] Figure 2 A schematic structural diagram of a waveguide light energy transmission detection device provided in another embodiment of the present application is shown.

[0018] Figure 3 Shows Figure 2 Schematic diagram of the light spot formed by the second light beam in the coupling-in area of ​​the waveguide.

[0019] Figure 4 A schematic structural diagram of a waveguide light energy transmission detection device provided in yet another embodiment of the present application is shown.

[0020] Figure 5 A schematic diagram of the field of view angle of the waveguide provided in an embodiment of the present application is shown.

[0021] Figure 6 Shows Figure 4 Schematic diagram of the light spot formed by the third light beam in the imaging area of ​​the waveguide.

[0022] Figure 7 A schematic structural diagram of a waveguide optical energy transmission detection device provided in yet another embodiment of the present application is shown. DETAILED DESCRIPTION

[0023] 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.

[0024] The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0025] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] Please refer to Figure 1 , Figure 1 The structure diagram of the waveguide light energy transmission detection device 100 provided in one embodiment of the present application is shown. Figure 1 The waveguide light energy transmission detection device 100 provided in the embodiment of the present application is described in detail. Figure 1 As shown, the waveguide light energy transmission detection device 100 of the present application includes an optical engine 10 , a first aperture 20 and a light energy detection module 30 .

[0027] Optionally, the waveguide 200 and the optical machine 10 are the main optical devices constituting the virtual display device. The light beam emitted by the optical machine 10 for forming a display image can be transmitted through the waveguide 200 and projected in front of the user's eyes to form a virtual display image. The optical performance of the waveguide 200 has an important influence on the final display effect of the virtual display device. Therefore, the optical performance of the waveguide 200 needs to be tested to determine whether the current optical performance of the waveguide 200 meets the usage requirements.

[0028] In this embodiment, the waveguide 200 is provided with a coupling-in region 201 and a coupling-out region 202. When the optical machine 10 projects a light beam to the coupling-in region 201 of the waveguide 200, part of the light beam coupled in by the coupling-in region 201 of the waveguide 200 is totally reflected in the waveguide 200. The waveguide 200 totally reflects the part of the light beam and couples it out from the coupling-out region 202. By detecting the beam energy of the coupled-in light beam and the beam energy of the coupled-out light beam, the waveguide light energy transmission detection device 100 can complete the detection of the optical performance of the waveguide 200.

[0029] Optionally, the optical engine 10 is used to emit a first light beam and project the first light beam to the coupling region 201 of the waveguide 200, and the first light beam emitted by the optical engine 10 is used to detect the optical performance of the waveguide 200. The optical engine 10 of this embodiment is at least one of a spatial light modulation optical engine, a liquid crystal optical engine, and a light-emitting semiconductor optical engine.

[0030] Furthermore, a first aperture 20 is provided at the light exit of the optical machine 10 . When the exit pupil size of the optical machine 10 does not match the size of the coupling region 201 , the first aperture 20 is used to reduce the spot size of the first light beam and form a second light beam to be projected onto the coupling region 202 .

[0031] In some embodiments, the exit pupil size of the optical engine 10 is larger than the size of the coupling region 201. When the light energy transmission efficiency of the waveguide 200 is detected, the first aperture 20 disposed at the light exit of the optical engine 10 is used to reduce the exit pupil size of the optical engine 10 so that the exit pupil size of the optical engine 10 matches the size of the coupling region 201 of the waveguide 200. The spot size of the first light beam emitted by the optical engine 10 is reduced when passing through the first aperture 20, thereby forming a second light beam, and the spot size of the spot formed by the second light beam in the coupling region 201 matches the size of the coupling region 201 of the waveguide 200. Based on this, by using the light energy detection module 30 to detect the beam energy of the second light beam coupled into the coupling region 201 of the waveguide 200 in the coupling region 201 of the waveguide 200, and to detect the beam energy of the third light beam coupled out of the coupling region 202 in the coupling region 202 of the waveguide 200, the light energy transmission efficiency of the waveguide 200 can be accurately determined.

[0032] In other embodiments, the exit pupil size of the optical machine 10 is smaller than the size of the coupling region 201. When the light energy transmission efficiency of the waveguide 200 is detected, the first aperture 20 provided at the light exit of the optical machine 10 is used to reduce the spot size of the first light beam and form a second light beam to be projected into the coupling region 201. At this time, the aperture size of the first aperture 20 is much smaller than the size of the coupling region 201. By moving the optical machine 10, the first light beam emitted by the optical machine 10 forms a second light beam after passing through the first aperture 20. When the spot formed by the second light beam in the coupling region 201 gradually covers the coupling region 201 of the waveguide 200, the light energy transmission efficiency of the waveguide 200 can be determined by detecting the beam energies of the second light beam and the third light beam. Among them, the exit pupil size is the size of the spot formed after the first light beam passes through the light exit lens at the light exit of the optical machine 10. The exit pupil size is related to the size of the light exit lens at the light exit of the optical machine 10.

[0033] In this embodiment, when the optical performance of the waveguide 200 is detected, a light energy detection module 30 is provided in the waveguide light energy transmission detection device 100, and the light energy detection module 30 is used to detect the beam energy of the second light beam coupled into the coupling region 201 in the coupling region 201 of the waveguide 200, and to detect the beam energy of the third light beam coupled out of the coupling region 202 in the coupling region 202 of the waveguide 200.

[0034] Specifically, after each time the optical machine 10 is driven to move, the light energy detection module 30 only detects the energy of the partial light beam of the second light beam currently emitted by the optical machine 10 and projected onto the outcoupling area 202 of the waveguide 200, and detects the beam energy of the third light beam currently coupled out of the outcoupling area 202 of the waveguide 200. Thus, the light energy detection device can determine the optical performance of the waveguide 200 based on the detected beam energy of the coupled-in second light beam and the beam energy of the coupled-out third light beam, which can be the accurate light energy transmission efficiency of the waveguide 200.

[0035] In this embodiment, the waveguide optical energy transmission detection device 100 includes: an optical machine 10, which is used to emit a first light beam; a first aperture 20, which is arranged at the light output of the optical machine 10, and the first aperture 20 is used to reduce the spot size of the first light beam and form a second light beam to be projected to the coupling-in area 201; a light energy detection module 30, and the light energy detection module 30 is used to detect the beam energy of the second light beam coupled into the waveguide 200, and the beam energy of the third light beam coupled out from the coupling-out area 202. Based on this, by setting a first aperture 20 for reducing the spot size of the second light beam projected by the optical machine 10 to the coupling area 201 at the light exit of the optical machine 10, the second light beam emitted by the optical machine 10 can cover the coupling area 201 after processing, so that by detecting the beam energy of the second light beam coupled into the coupling area 201 and the third light beam emitted from the out-coupling area 202, the optical performance of the waveguide 200 can be detected when the exit pupil size of the optical machine 10 does not match the size of the coupling area 201, thereby improving the compatibility of the waveguide light energy transmission detection device 100 for optical performance detection of the waveguide 200 under different optical parameters, and reducing the detection cost of the waveguide 200.

[0036] Please refer to Figure 2 , Figure 2 FIG. 2 shows a schematic diagram of the structure of a waveguide light energy transmission detection device provided by another embodiment of the present application. Figure 2 As shown, the waveguide light energy transmission detection device of the present application includes an optical engine 10 , a first aperture 20 and a light energy detection module 30 .

[0037] Optionally, when the exit pupil size of the optical machine 10 is smaller than the size of the coupling area, since the brightness of the first light beam emitted by the optical machine 10 is uniform and the coupling areas of the optical machine 10 and the waveguide are close to each other, when the first light beam emitted by the optical machine 10 is projected onto the coupling area of ​​the waveguide, the spot size of the light spot formed by the first light beam in the coupling area matches the exit pupil size of the optical machine 10, resulting in the spot size of the light spot formed by the first light beam in the coupling area being smaller than the size of the coupling area of ​​the waveguide, and no light beam is coupled into some coupling areas of the waveguide, which makes it impossible to accurately detect the optical performance of the waveguide.

[0038] In this embodiment, a first diaphragm 20 is provided at the light exit of the optical machine 10. The first diaphragm 20 is an aperture diaphragm, which is an diaphragm for limiting the aperture of the light beam, that is, the diaphragm that determines the size (width) of the imaging light beam of the optical system is called an aperture diaphragm. By setting the aperture size of the first diaphragm 20 to be much smaller than the size of the coupling region, when the first light beam emitted by the optical machine 10 is projected onto the first diaphragm 20, the part of the light beam in the first light beam that passes through the aperture of the first diaphragm 20 is the second light beam, and the rest of the light beam in the first light beam except the second light beam is blocked by the first diaphragm 20 and cannot be projected onto the coupling region of the waveguide, so that the first diaphragm 20 at the light exit of the optical machine 10 can reduce the spot size of the first light beam and form a second light beam to be projected onto the coupling region. Therefore, the first diaphragm 20 can limit the spot size of the second light beam projected by the optical machine 10 onto the coupling region formed in the coupling region, and make the spot size of the second light beam match the aperture size of the first diaphragm 20. The aperture shape of the first aperture 20 is at least one of circular, rectangular and square, which is not limited here.

[0039] Furthermore, the optical energy transmission detection device of the waveguide further includes a second aperture 40 disposed at the light entrance of the coupling region, the aperture shape of the second aperture 40 is the same as the shape of the coupling region, and the aperture size of the second aperture 40 matches the size of the coupling region. The second aperture 40 is used to limit the second light beam that can be detected by the optical energy detection device of the waveguide to be a partial light beam coupled into the coupling region of the waveguide, so that the beam energy of the partial light beam actually coupled into the coupling region of the waveguide can be accurately detected, thereby improving the accuracy of the optical performance detection of the waveguide.

[0040] In this embodiment, a displacement stage 50 is provided to be mechanically connected to the optical machine 10. After the first light beam emitted by the optical machine 10 passes through the first aperture 20 and the second aperture 40 to form the second light beam, the displacement stage 50 can drive the optical machine 10 to move multiple times in the first plane, so that the light spot formed by the second light beam in the coupling area gradually covers the coupling area, and the first plane is parallel to the plane where the coupling area is located.

[0041] like Figure 3 As shown, Figure 3 Shows Figure 2 Schematic diagram of the light spot formed by the second light beam in the coupling region of the waveguide. When the light spot 61 formed by the second light beam in the coupling region 201 partially overlaps before and after the movement, there will be repeated detection when the light energy of the coupled light beam is detected at the light outlet of the second aperture by the light energy detection module, resulting in inaccurate detection of the light energy of the coupled light beam, thereby causing inaccurate light energy transmission efficiency of the waveguide 200 obtained by the final analysis.

[0042] Therefore, in this embodiment, if the aperture shape of the first aperture is set to be a square, when the translation stage drives the optical machine to move in the first plane, the displacement amount of each movement of the optical machine is equal to the side length of the square aperture in the first aperture, so that the edges of the light spot 61 formed by the second light beam in the coupling area 201 before and after the movement are aligned, and the light spot 61 formed by the second light beam in the coupling area 201 before and after the movement do not overlap, thereby improving the accuracy of the detection of the light energy transmission efficiency of the waveguide 200.

[0043] Optionally, when the translation stage drives the optical machine to move multiple times in the first plane, the light spot 61 formed in the coupling area 201 by the second light beam projected to the coupling area 201 by the optical machine during the movement can gradually cover the coupling area 201, and by collecting the second light beam coupled into the coupling area 201 and the third light beam emitted from the coupling area after each movement, and detecting the beam energies of the second light beam and the third light beam, the light energy transmission efficiency of the waveguide when the optical machine couples light beams at different positions in the coupling area 201 can be determined.

[0044] In this embodiment, the aperture size of the first diaphragm 20 in the waveguide light energy transmission detection device is set to be much smaller than the size of the coupling region, so that the first diaphragm 20 is used to reduce the spot size of the first light beam, and a second light beam is formed to be projected into the coupling region, and the displacement stage 50 is set to drive the optical machine 10 to move multiple times, so that after the first light beam emitted by the optical machine 10 passes through the first diaphragm 20 to form a second light beam, the spot formed by the second light beam in the coupling region gradually covers the coupling region of the waveguide. Based on this, by detecting the beam energy of the second light beam and the third light beam after each movement of the optical machine 10, the light energy transmission efficiency of the waveguide when the optical machine 10 couples the light beam at different positions in the coupling region is determined, so that when the exit pupil size of the optical machine 10 does not match the size of the coupling region, the waveguide light energy transmission detection device of this embodiment can also accurately test and obtain the optical performance of the waveguide, thereby improving the compatibility of the waveguide light energy transmission detection device for optical performance detection of the waveguide under different optical parameters, and reducing the design cost of the light machine 10 when the optical performance detection of the waveguide is performed.

[0045] Please refer to Figure 4 , Figure 4 FIG. 2 shows a schematic diagram of the structure of a waveguide light energy transmission detection device provided by another embodiment of the present application. Figure 4 As shown, the waveguide light energy transmission detection device of the present application includes an optical engine 10 , a first aperture 20 , a light energy detection module and a second aperture 40 .

[0046] Optionally, the aperture size of the first aperture 20 is adjustable, and in order to detect the optical performance of the waveguide when the field of view angle of the optical machine 10 matches the field of view angle of the waveguide, the aperture size of the first aperture 20 at the light exit of the optical machine 10 is set to match the exit pupil size of the optical machine 10. In addition, a second aperture 40 is provided at the light entrance of the coupling region, and the aperture shape of the second aperture 40 is the same as the shape of the coupling region, and the aperture size of the second aperture 40 matches the size of the coupling region.

[0047] In some embodiments, when the field of view angle of the optical machine 10 is greater than or equal to the field of view angle of the waveguide, and the exit pupil size of the optical machine 10 is greater than or equal to the size of the coupling area, the second aperture 40 is used to adjust the spot shape of the first light beam and form a second light beam to be projected onto the coupling area. The spot shape of the spot formed by the second light beam in the coupling area is the same as the shape of the coupling area, and the spot size of the spot matches the size of the coupling area.

[0048] Among them, since the field of view angle of the optical machine 10 is greater than or equal to the field of view angle of the waveguide, the output angle of the third light beam emitted from the outcoupling area of ​​the waveguide matches the field of view angle of the waveguide. Therefore, by detecting the beam energy of the second light beam and the third light beam, the optical performance of the waveguide when the field of view angle of the waveguide is fully used can be detected.

[0049] In other embodiments, when the field of view angle of the optical machine 10 is smaller than the field of view angle of the waveguide, in order to realize the detection of the optical performance of the waveguide with a large field of view angle by using the optical machine 10 with a small field of view, a rotating table 70 is provided in this embodiment. The rotating table 70 is mechanically connected to the optical machine 10. The rotating table 70 is used to drive the optical machine 10 to rotate multiple times so that the optical machine 10 projects a second light beam with an incident angle of a target angle to the coupling area. The target angle matches the field of view angle of the waveguide, and the beam center of the second light beam in the coupling area coincides with the center of the coupling area.

[0050] In this embodiment, if the horizontal field angle of the first light beam emitted by the optical machine 10 is smaller than the horizontal field angle of the waveguide, the rotating stage 70 drives the optical machine 10 to rotate a certain angle in the horizontal direction, so that after the rotation, the optical machine 10 projects a second light beam whose incident angle matches the field angle of the waveguide to the coupling area.

[0051] Among them, Figure 5 As shown, Figure 5A schematic diagram of the field of view of the waveguide provided in an embodiment of the present application is shown. The horizontal field of view of the waveguide can determine the width of the imaging area 203 corresponding to the outcoupling area 202 of the waveguide, and the vertical field of view can determine the height of the imaging area 203 corresponding to the outcoupling area 202 of the waveguide. If the vertical field of view of the first light beam emitted by the optical machine is smaller than the horizontal field of view of the waveguide, the rotating stage drives the optical machine to rotate a certain angle in the vertical direction, so that the optical machine after rotation projects a second light beam whose incident angle matches the field of view of the waveguide to the incoupling area 202.

[0052] like Figure 6 As shown, Figure 6 Shows Figure 4 Schematic diagram of the light spot formed by the third light beam in the imaging area 203 of the waveguide. In this embodiment, when the rotating stage does not drive the optical machine to rotate, after the second light beam incident on the coupling-in area of ​​the optical machine is coupled into the waveguide, the third light beam coupled out of the coupling-out area forms a light spot S1 in the imaging area 203 corresponding to the coupling-out area; after the rotating stage drives the optical machine to rotate clockwise by a certain angle, the optical machine projects the second light beam whose incident angle matches the field angle of the waveguide to the coupling-in area, and the third light beam coupled out of the coupling-out area forms a light spot S2 in the imaging area 203 corresponding to the coupling-out area; after the rotating stage 70 drives the optical machine to rotate counterclockwise by a certain angle, the optical machine projects the second light beam whose incident angle matches the field angle of the waveguide to the coupling-in area, and the third light beam coupled out of the coupling-out area forms a light spot S3 in the imaging area 203 corresponding to the coupling-out area.

[0053] Optionally, the light energy detection module detects the beam energy of the second light beam coupled into the coupling area of ​​the waveguide after each rotation and the third light beam emitted from the coupling area, and analyzes the beam energy obtained by multiple measurements. It can determine whether the field of view angle of the light output device 10 matches the field of view angle of the waveguide, that is, the optical performance of the waveguide when the field of view angle of the waveguide is fully used.

[0054] In this embodiment, the light energy detection module includes a first detection unit 31 and a second detection unit 32. The first detection unit 31 is disposed between the second aperture 40 and the coupling region, and is used to collect the second light beam coupled to the coupling region of the waveguide, and detect the beam energy of the second light beam; the second detection unit 32 is disposed in the light beam output direction of the coupling region, and is used to collect the third light beam emitted from the coupling region, and detect the beam energy of the third light beam. The first detection unit 31 and the second detection unit 32 are at least one of a brightness meter, an integrating sphere, and a power meter, which are not limited here.

[0055] Furthermore, the light energy detection module also includes a transmission efficiency analysis unit 33, which is electrically connected to the first detection unit 31 and the second detection unit 32, respectively. The transmission efficiency analysis unit 33 is used to receive the beam energy of the second light beam from the first detection unit 31 and receive the beam energy of the third light beam from the second detection unit 32, so as to obtain the optical performance of the waveguide according to the beam energy analysis of the second light beam and the third light beam.

[0056] In this embodiment, the aperture size of the first aperture 20 is set to be adjustable, the aperture size of the second aperture 40 is matched with the size of the coupling region, and the rotating table 70 is set to drive the optical machine 10 to rotate multiple times, so that the incident angle of the second light beam projected by the optical machine 10 to the coupling region matches the field of view angle of the waveguide. Based on this, when the field of view angle of the optical machine 10 is smaller than the field of view angle of the waveguide, the aperture size of the first aperture 20 is set to match the exit pupil size of the optical machine 10, so that the present application can accurately measure the field of view angle of the optical machine 10 and the field of view angle of the waveguide by detecting the beam energy of the second light beam and the third light beam after the optical machine 10 rotates multiple times, that is, the optical performance of the waveguide when the field of view angle of the waveguide is fully used, thereby improving the compatibility of the optical energy transmission detection device of the waveguide for optical performance detection of the waveguide under different optical parameters, and reducing the design cost of the light machine 10 when the optical performance detection of the waveguide is performed.

[0057] As an implementation method, Figure 7 As shown, Figure 7 FIG. 2 shows a schematic diagram of the structure of a waveguide light energy transmission detection device provided by another embodiment of the present application. Figure 7 As shown, the waveguide light energy transmission detection device of the present application includes an optical engine 10 , a first aperture 20 , a light energy detection module 30 , a second aperture 40 , a translation stage 50 and a rotation stage 70 .

[0058] Optionally, a first aperture 20 is provided at the light exit of the optical machine 10, and the aperture size of the first aperture 20 is adjustable; a second aperture 40 is provided at the light entrance of the coupling area 201, and the aperture shape of the second aperture 40 is the same as the shape of the coupling area 201, and the aperture size of the second aperture 40 matches the size of the coupling area 201.

[0059] In this embodiment, the optical machine 10 is mechanically connected to the translation stage 50 and the rotation stage 70 respectively. The translation stage 50 is used to drive the optical machine 10 to move horizontally, and the rotation stage 70 is used to drive the optical machine 10 to rotate.

[0060] Optionally, if the exit pupil size of the optical machine 10 is larger than the size of the coupling region 201, the aperture size of the first aperture 20 is set to match the size of the coupling region 201 of the waveguide 200, and the first aperture 20 is used to match the exit pupil size of the optical machine 10 with the size of the coupling region 201 of the waveguide 200, so that after the first light beam emitted by the optical machine 10 passes through the first aperture 20 to form a second light beam, the light spot formed by the second light beam in the coupling region 201 just covers the coupling region 201 of the waveguide. Based on this, the optical energy transmission detection device of the waveguide of this embodiment can determine the optical energy transmission efficiency of the waveguide by detecting the beam energy of the second light beam coupled in the coupling region and the third light beam coupled out of the outcoupling region when the exit pupil size of the optical machine 10 is larger than the size of the coupling region 201.

[0061] Optionally, if the exit pupil size of the optical machine 10 is smaller than the size of the coupling region 201, the aperture size of the first diaphragm 20 is set to be much smaller than the size of the coupling region 201, and the first diaphragm 20 is used to reduce the spot size of the first light beam and form a second light beam to be projected into the coupling region 201, and the displacement stage 50 can drive the optical machine 10 to move multiple times, so that after the first light beam emitted by the optical machine 10 passes through the first diaphragm 20 to form the second light beam, the spot formed by the second light beam in the coupling region 201 gradually covers the coupling region 201 of the waveguide. Based on this, the optical energy transmission detection device of the waveguide of this embodiment can determine the optical energy transmission efficiency of the waveguide when the optical machine 10 couples light beams at different positions of the coupling region 201 by detecting the beam energies of the second light beam and the third light beam after each movement of the optical machine 10 when the exit pupil size of the optical machine 10 is smaller than the size of the coupling region 201, which can be the optical energy transmission efficiency of the waveguide.

[0062] Optionally, if the field of view of the optical machine 10 is smaller than the field of view of the waveguide, the aperture size of the first aperture 20 is set to match the exit pupil size of the optical machine 10, and the aperture size of the second aperture 40 is set to match the size of the coupling region 201, so that the exit pupil size of the optical machine 10 matches the size of the coupling region 201, and the rotating stage 70 can drive the optical machine 10 to rotate multiple times, so that the incident angle of the second light beam projected by the optical machine 10 to the coupling region 201 matches the field of view of the waveguide. Based on this, the optical energy transmission detection device of the waveguide of this embodiment can determine that the field of view of the optical machine 10 matches the field of view of the waveguide by detecting the beam energy of the second light beam and the third light beam after the optical machine 10 rotates multiple times when the field of view of the optical machine 10 is smaller than the field of view of the waveguide, that is, the optical performance of the waveguide when the field of view of the waveguide is fully used.

[0063] It should be noted that the waveguides designed in virtual display devices in different application scenarios are different. During the production of virtual display devices, it is necessary to test the optical performance of different waveguides to determine whether the waveguide meets the performance requirements in the current application scenario and improve the use effect of the final virtual display device.

[0064] In the waveguide light energy transmission detection device used in the present application, by setting a first aperture 20 with an adjustable aperture size at the light exit of the waveguide, and setting a second aperture 40 with an aperture size matching the size of the coupling area 201 at the light entrance of the coupling area 201, the waveguide light energy transmission detection device does not need to design a corresponding optical machine 10 for the waveguide in different application scenarios. It only needs to use the displacement stage 50 and the rotation stage 70 to drive the optical machine 10 to undergo mechanical movement, so as to realize the detection of the optical performance of the waveguide in the scenario where the exit pupil size of the optical machine 10 does not match the size of the coupling area 201 or the field of view angle of the optical machine 10 does not match the field of view angle of the waveguide, thereby improving the compatibility of the waveguide light energy transmission detection device for optical performance detection of the waveguide under different optical parameters, and reducing the design cost of the light machine 10 when performing optical performance detection on the waveguide.

[0065] 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. A waveguide light energy transmission detection device, characterized in that: The waveguide is provided with an incoupling region and an outcoupling region, and the optical energy transmission detection device of the waveguide comprises: An optical machine, used for emitting a first light beam; A first aperture, disposed at the light exit of the optical machine, the first aperture is used to reduce the spot size of the first light beam and form a second light beam to be projected onto the coupling-in area; A light energy detection module, the light energy detection module is used to detect the beam energy of the second light beam coupled into the waveguide, and the beam energy of the third light beam coupled out of the outcoupling region.

2. The waveguide light energy transmission detection device according to claim 1, characterized in that: The waveguide light energy transmission detection device also includes a second aperture, which is arranged at the light entrance of the coupling area. The aperture shape of the second aperture is the same as the shape of the coupling area, and the aperture size of the second aperture matches the size of the coupling area.

3. The waveguide light energy transmission detection device according to claim 2, characterized in that: The exit pupil size of the optical machine is larger than the size of the coupling area, the aperture shape of the first aperture is the same as the shape of the coupling area, and the aperture size of the first aperture matches the size of the coupling area, and the beam center of the second light beam in the coupling area coincides with the center of the coupling area.

4. The waveguide light energy transmission detection device according to claim 2, characterized in that: The exit pupil size of the optical machine is smaller than the size of the coupling-in area, and the waveguide light energy transmission detection device further includes a displacement stage; The translation stage is mechanically connected to the optical machine, and is used to drive the optical machine to move multiple times in the first plane so that the light spot formed by the second light beam in the coupling area gradually covers the coupling area, the first plane is parallel to the plane where the coupling area is located, and after each movement, the light spots formed by the second light beam at different positions in the coupling area do not overlap.

5. The waveguide light energy transmission detection device according to claim 2, characterized in that: The field of view angle of the optical machine is smaller than the field of view angle of the waveguide, and the optical energy transmission detection device of the waveguide further includes a rotating mechanism; The rotating mechanism is mechanically connected to the optical machine, and is used to drive the optical machine to rotate multiple times so that the optical machine projects the second light beam with an incident angle of a target angle to the coupling region, and the target angle matches the field of view angle of the waveguide.

6. The waveguide light energy transmission detection device according to claim 2, characterized in that: The light energy detection module includes a first detection unit and a second detection unit; The first detection unit is disposed between the second aperture and the coupling-in region, and is used for collecting the second light beam coupled into the coupling-in region and detecting the beam energy of the second light beam; The second detection unit is disposed in the light beam output direction of the outcoupling region, and is used to collect the third light beam emitted from the outcoupling region and detect the light beam energy of the third light beam.

7. The waveguide light energy transmission detection device according to claim 6, characterized in that: The light energy detection module further includes a transmission efficiency analysis unit, which is electrically connected to the first detection unit and the second detection unit respectively, and is used to receive the beam energy of the second light beam and the third light beam.

8. The waveguide light energy transmission detection device according to claim 6, characterized in that: The first detection unit and the second detection unit are at least one of a luminance meter, an integrating sphere and a power meter.

9. The waveguide light energy transmission detection device according to any one of claims 1 to 8, characterized in that: The aperture shape of the first aperture is at least one of circular, rectangular and square.

10. The waveguide light energy transmission detection device according to any one of claims 1 to 8, characterized in that: The optical machine is at least one of a spatial light modulation optical machine, a liquid crystal optical machine and a light emitting semiconductor optical machine.

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