Optical waveguide assembly and near-to-eye display device

Abstract

The invention discloses an optical waveguide assembly and near-to-eye display equipment, and the optical waveguide assembly comprises a first waveguide plate which is internally provided with a first array spectroscope; the first polarization beam splitter is arranged on the first surface, and the first polarization beam splitter is used for transmitting the light in the first polarization direction and reflecting the light in the second polarization direction; the first depolarizer is arranged on the side, away from the first waveguide plate, of the first polarization beam splitter, and the first depolarizer is used for converting the polarized light into non-polarized light; the second waveguide plate is arranged on one side, deviating from the first polarization beam splitter, of the first depolarizer; and the second polarization beam splitter is arranged on the second surface, and the second polarization beam splitter is used for transmitting the light in the second polarization direction and reflecting the light in the first polarization direction. According to the optical waveguide assembly provided by the invention, the uniformity of light coupled by the optical waveguide assembly can be improved.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and in particular to an optical waveguide component and a near-eye display device. Background Art

[0002] Augmented Reality (AR) technology cleverly integrates virtual information with the real world. It can simulate computer-generated virtual information such as text, images, 3D models, music, and videos, and then apply it to the real world, supplementing the real world with real information and thus "enhancing" the real world. Currently, the main technologies used in transmissive head-mounted displays for AR include Birdbath, prisms, free-form surfaces, and optical waveguides. Compared to other technologies, head-mounted displays using optical waveguides are smaller.

[0003] In optical waveguide devices, polarization control is a key factor affecting light transmission efficiency and imaging uniformity. In traditional one-dimensional waveguide structures, the polarization state of light in the one-dimensional waveguide can usually remain consistent. However, in two-dimensional waveguide structures, due to the need to achieve pupil expansion in two orthogonal directions, its optical characteristics are more complex. In the first pupil expansion, the incident plane of the light is not parallel to the perpendicular plane of the dihedral angle of the turning film layer in the waveguide substrate, resulting in a difference in the polarization ratio of the reflected light and the transmitted light compared to the incident light. This problem is particularly significant under the iterative action of multiple turning film layers. As the light is reflected and transmitted multiple times between the film layers, the polarization state of the transmitted light will gradually deviate from the polarization properties of the initial incident light, resulting in large aberrations in the polarization characteristics of the light output by the turning film layer near the initial position and the turning film layer near the end position, and the uniformity of the coupled light is poor. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an optical waveguide component that can improve the uniformity of outcoupled light.

[0005] The present invention also provides a near-eye display device having the optical waveguide assembly.

[0006] According to the optical waveguide component of the first aspect of the present invention, the optical waveguide component includes a first waveguide unit, wherein the first waveguide unit includes:

[0007] a first waveguide plate, the first waveguide plate comprising a first surface and a second surface arranged opposite to each other, a first array beam splitter disposed in the first waveguide plate, the first array beam splitter being arranged at an angle to the first surface and the second surface, and the first array beam splitter being used to couple light transmitted in the first waveguide plate out of the first surface;

[0008] a first polarization beam splitter, disposed on the first surface, configured to transmit light in a first polarization direction and reflect light in a second polarization direction;

[0009] a first depolarizer, the first depolarizer being disposed on a side of the first polarization beam splitter facing away from the first waveguide plate, the first depolarizer being configured to convert polarized light into non-polarized light;

[0010] a second waveguide plate, the second waveguide plate being arranged on a side of the first depolarizer away from the first polarization beam splitter;

[0011] a second polarization beam splitter, the second polarization beam splitter being disposed on the second surface, the second polarization beam splitter being configured to transmit light in the second polarization direction and reflect light in the first polarization direction;

[0012] The first polarization direction is perpendicular to the second polarization direction.

[0013] In some embodiments, the first waveguide unit further includes a third waveguide plate, and the third waveguide plate is disposed between the first polarization beam splitter and the first depolarizer.

[0014] In some optional embodiments, the first waveguide unit further includes a fourth waveguide plate, and the fourth waveguide plate is disposed on a side of the second polarization beam splitter facing away from the first waveguide plate.

[0015] In some optional embodiments, the optical waveguide assembly further includes a second waveguide unit, the second waveguide unit is aligned with the first waveguide unit, and the second waveguide unit includes a fifth waveguide plate.

[0016] In some optional embodiments, a plurality of the first waveguide units and a plurality of the second waveguide units are provided, and the plurality of the first waveguide units and the plurality of the second waveguide units are alternately arranged.

[0017] In some optional embodiments, the first waveguide plate, the second waveguide plate, the third waveguide plate, the fourth waveguide plate and the fifth waveguide plate are made of the same material.

[0018] In some optional embodiments, the optical waveguide assembly further includes a third waveguide unit, the third waveguide unit being aligned with and alternately arranged with the first waveguide unit, the third waveguide unit including:

[0019] a sixth waveguide plate, the sixth waveguide plate comprising a third surface and a fourth surface disposed opposite each other, the sixth waveguide plate being aligned with the first waveguide plate, the sixth waveguide plate being provided with a second array of beam splitters, the second array of beam splitters being disposed at an angle to the third surface and the fourth surface;

[0020] a third polarization beam splitter, the third polarization beam splitter being disposed on the fourth surface, the third polarization beam splitter being configured to transmit light in a first polarization direction and reflect light in a second polarization direction;

[0021] a second depolarizer, the second depolarizer being arranged on a side of the third polarization beam splitter away from the sixth waveguide plate, the second depolarizer being configured to convert polarized light into non-polarized light;

[0022] a seventh waveguide plate, the seventh waveguide plate being arranged on a side of the second depolarizer away from the third polarization beam splitter;

[0023] a fourth polarization beam splitter, the fourth polarization beam splitter being disposed on the third surface, the fourth polarization beam splitter being configured to transmit light in the second polarization direction and reflect light in the first polarization direction;

[0024] An eighth waveguide plate is disposed on a side of the fourth polarization beam splitter facing away from the sixth waveguide plate.

[0025] In some optional embodiments, the third waveguide unit further includes a ninth waveguide plate, and the ninth waveguide plate is disposed between the third polarization beam splitter and the second depolarizer.

[0026] In some optional embodiments, the first waveguide plate, the second waveguide plate, the third waveguide plate, the fourth waveguide plate, the sixth waveguide plate, the seventh waveguide plate, the eighth waveguide plate and the ninth waveguide plate are made of the same material.

[0027] According to the optical waveguide component of the present invention, by stacking a first polarization beam splitter, a first depolarizer, and a second waveguide plate on the first surface of the first waveguide plate, and arranging a second polarization beam splitter on the second surface, only light with a first polarization direction can enter the first waveguide plate from the first surface. At the same time, after the polarization of the light transmitted by the first array beam splitter is redistributed, the light with a second polarization direction will be transmitted from the second polarization beam splitter, so that only the light with the first polarization direction can be transmitted in the first waveguide plate and reflected by the first array beam splitter to couple out of the optical waveguide component to enter the human eye, while the light with the second polarization direction cannot be transmitted in the first waveguide plate, ensuring that the polarization state of the light directed to the first array beam splitter is basically the same after passing through the first array beam splitter multiple times, so that the first array beam splitter can better match the polarization state of the light, thereby improving the uniformity of the light coupled out of the optical waveguide component.

[0028] A near-eye display device according to a second aspect of the present invention comprises:

[0029] A projection component, configured to project light;

[0030] According to the optical waveguide assembly of the first aspect of the present invention, the optical waveguide assembly is used to receive the light projected by the projection assembly and transmit the light to the human eye.

[0031] According to the near-eye display device of the present invention, the optical waveguide assembly of the first aspect is provided, thereby improving the overall performance of the near-eye display device.

[0032] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of an optical waveguide assembly according to one embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of an optical waveguide assembly according to another embodiment of the present invention;

[0035] Figure 3 FIG. 4 is a schematic diagram of an optical waveguide assembly according to another embodiment of the present invention.

[0036] Reference numerals:

[0037] 1000: optical waveguide component; 100: first waveguide unit; 110: first waveguide plate; 111: first surface; 112: second surface; 120: first polarization beam splitter; 130: third waveguide plate; 140: first depolarizer; 150: second waveguide plate; 160: second polarization beam splitter; 170: fourth waveguide plate; 180: first array spectrometer; 200: second waveguide unit; 210: fifth waveguide plate; 300: third waveguide unit; 310: sixth waveguide plate; 311: third surface; 312: fourth surface; 320: third polarization beam splitter; 330: ninth waveguide plate; 340: second depolarizer; 350: seventh waveguide plate; 360: fourth polarization beam splitter; 370: eighth waveguide plate; 380: second array spectrometer. DETAILED DESCRIPTION

[0038] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0039] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will appreciate the applicability of other processes and / or the use of other materials.

[0040] Reference below Figure 1-Figure 3 An optical waveguide assembly 1000 according to an embodiment of the present invention is described. The optical waveguide assembly 1000 can be used to guide light to be transmitted within the optical waveguide assembly 1000. The optical waveguide assembly 1000 according to the embodiment of the present invention includes a first waveguide unit 100, wherein the first waveguide unit 100 may include a second polarization beam splitter 160, a first waveguide plate 110, a first polarization beam splitter 120, a first depolarizer 140, and a second waveguide plate 150, which are stacked in sequence.

[0041] like Figure 1 As shown, further, the first waveguide plate 110 includes a first surface 111 and a second surface 112 that are arranged relative to and in parallel. A first array spectrometer 180 is arranged in the first waveguide plate 110, and the first array spectrometer 180 is arranged at an angle to the first surface 111 and the second surface 112. The first array spectrometer 180 is used to couple the light transmitted in the first waveguide plate 110 out from the first surface 111; specifically, the first surface 111 and the second surface 112 can be arranged approximately parallel, and the angles between the first array spectrometer 180 and the first surface 111 and the second surface 112 can be 15°, 30°, 45°, 60°, 75°, etc. The embodiment of the present invention is not limited to this, as long as there is an angle between the first array spectrometer 180 and the first surface 111 and the second surface 112.

[0042] It should be noted that the first array beam splitter 180 includes multiple beam splitters arranged in an array. When light is transmitted to a beam splitter, a portion of the light is reflected by the beam splitter to form reflected light, which is then emitted from the first surface 111 of the first waveguide plate 110. Another portion of the light is transmitted by the beam splitter to form transmitted light, which can then be emitted from the first waveguide plate 110 from the second surface 112 or continue to be transmitted within the first waveguide plate 110. The reflection and transmittance ratios of the multiple beam splitters can be different, and this is not limited in this embodiment of the present invention.

[0043] like Figure 1As shown, further, the first polarization beam splitter 120 is arranged on the first surface 111, and the first polarization beam splitter 120 is used to transmit light in the first polarization direction and reflect light in the second polarization direction; specifically, the first polarization beam splitter 120 can be an optical element such as a wire grid, and the first polarization beam splitter 120 can be fixed to the first surface 111 using optical glue.

[0044] like Figure 1 As shown, further, the first depolarizer 140 is arranged on the side of the first polarization beam splitter 120 away from the first waveguide plate 110, and the first depolarizer 140 is used to convert polarized light into non-polarized light; specifically, the first depolarizer 140 can be an optical element such as a phase delay plate or a depolarization film, and the first depolarizer 140 is stacked on the first polarization beam splitter 120.

[0045] Please continue to refer to Figure 1 Furthermore, the second waveguide plate 150 is arranged on the side of the first depolarizer 140 away from the first polarization beam splitter 120; it can be understood that when the light incident into the second waveguide plate 150 meets the total reflection condition of the second waveguide plate 150, the light can be totally reflected from the second waveguide plate 150 and incident on the first waveguide plate 110 again.

[0046] Please continue to refer to Figure 1 Furthermore, a second polarization beam splitter 160 is disposed on the second surface 112, and the second polarization beam splitter 160 is used to transmit light in the second polarization direction and reflect light in the first polarization direction; specifically, the second polarization beam splitter 160 can also be an optical element such as a wire grid, and the second polarization beam splitter 160 can be fixed to the second surface 112 using optical glue.

[0047] It should be noted that the first polarization direction is perpendicular to the second polarization direction. Specifically, for example, the light in the first polarization direction may be s-light, and the light in the second polarization direction may be p-light, or the light in the first polarization direction may be p-light, and the light in the second polarization direction may be s-light. The embodiments of the present invention are not limited to this.

[0048] Please continue to refer to Figure 1Specifically, when light is transmitted in the optical waveguide component 1000, after passing through the first depolarizer 140, the light is unpolarized. When the unpolarized light is emitted to the first polarization beam splitter 120, the light in the first polarization direction can pass through the first polarization beam splitter 120 and enter the first waveguide plate 110, wherein part of the light in the first polarization direction is reflected by the first array beam splitter 180 to form a reflected light beam, which is emitted from the first waveguide plate. Moreover, when the reflected light beam passes through the first polarization beam splitter 120 and the first depolarizer 140 to reach the second waveguide plate 150, it does not meet the total internal reflection requirement of the second waveguide plate 150, so the reflected light beam will be coupled out from the optical waveguide component 1000.

[0049] Furthermore, another portion of the light in the first polarization direction is transmitted by the first array beam splitter 180 to form a transmitted light beam, which continues to propagate through the first waveguide plate 110. It is understandable that, because the first array beam splitter 180 redistributes the polarization of the transmitted light beam, the transmitted light beam still contains light in the first polarization direction and light in the second polarization direction. When the transmitted light beam is emitted from the first waveguide plate to the second polarization beam splitter 160, the second polarization beam splitter 160 can transmit the light in the second polarization direction. In other words, the light in the second polarization direction will be emitted from the optical waveguide assembly 1000, while the light in the first polarization direction will continue to propagate through the first waveguide plate 110.

[0050] Furthermore, when unpolarized light is incident on the first polarization beam splitter 120, light of the second polarization direction can be reflected by the first polarization beam splitter 120 and pass through the first depolarizer 140, where it is converted back into unpolarized light and enters the second waveguide plate 150. After being totally reflected in the second waveguide plate 150, it is again incident on the first depolarizer 140 and the first polarization beam splitter 120. The situation in which the unpolarized light is incident on the first polarization beam splitter 120 is the same as that described above and will not be further described here.

[0051] In actual research, the inventors discovered that as light is reflected and transmitted multiple times between film layers, the polarization state of the transmitted light may gradually deviate from the polarization properties of the initial incident light, resulting in large aberrations in the polarization properties of the light output by the turning film layer near the initial position and the turning film layer near the end position, and poor uniformity of the coupled-out light.

[0052] In view of this, the optical waveguide assembly 1000 of the embodiment of the present invention can make only the light of the first polarization direction enter the first waveguide plate 110 from the first surface 111 by stacking the first polarization beam splitter 120, the first depolarizer 140 and the second waveguide plate 150 on the first surface 111 of the first waveguide plate 110, and the second polarization beam splitter 160 on the second surface 112. At the same time, after the polarization of the light transmitted by the first array beam splitter is redistributed, the light of the second polarization direction will be transmitted from the second polarization beam splitter 160, so that only the light of the first polarization direction can be transmitted in the first waveguide plate 110. The light is transmitted and reflected by the first array beam splitter 180 to be coupled out of the optical waveguide component 1000 to enter the human eye, while the light of the second polarization direction cannot be transmitted in the first waveguide plate 110, ensuring that the polarization state of the light emitted to the first array beam splitter 180 is basically the same after passing through the first array beam splitter 180 multiple times, so that the first array beam splitter 180 can better match the polarization state of the light, and the polarization state of the light reflected from the first array beam splitter 180 and exiting the first waveguide plate 110 is basically the same, thereby improving the uniformity of the light coupled out of the optical waveguide component 1000.

[0053] It should be noted that the optical waveguide assembly 1000 may be a one-dimensional waveguide or a two-dimensional waveguide, and this is not limited in this embodiment of the present invention. When the optical waveguide assembly 1000 is a two-dimensional waveguide, the optical waveguide assembly 1000 may further include an outcoupling waveguide, in which a light outcoupling structure is provided. The light reflected by the first array beam splitter 180 is emitted from the first surface 111 of the first waveguide plate 110 and then directed toward the second waveguide plate 150. After exiting the second waveguide plate 150, it is directed toward the outcoupling waveguide. After undergoing pupil expansion again in the outcoupling waveguide, it is emitted from the optical waveguide assembly 1000 and directed toward the human eye. Because the polarization states of the light reflected from the first array beam splitter 180 and exiting the first waveguide plate 110 are substantially the same, the polarization states of these light rays when they enter the outcoupling waveguide are substantially the same. This allows the light outcoupling structure in the outcoupling waveguide to effectively match the polarization state of these light rays, thereby further improving the uniformity of the outcoupling light from the optical waveguide assembly 1000.

[0054] Please continue to refer to Figure 1 In some embodiments, the first waveguide unit 100 further includes a third waveguide plate 130, which is disposed between the first polarization beam splitter 120 and the first depolarizer 140. That is, the first polarization beam splitter 120 and the first depolarizer 140 are respectively disposed on opposite sides of the third waveguide plate 130. Thus, the first polarization beam splitter 120 and the first depolarizer 140 can be bonded to opposite surfaces of the third waveguide plate 130, thereby simplifying the process of manufacturing the optical waveguide assembly 1000 and improving the stability of the optical waveguide assembly 1000.

[0055] Please continue to refer to Figure 1 In some optional embodiments, the first waveguide unit 100 further includes a fourth waveguide plate 170, which is disposed on a side of the second polarization beam splitter 160 facing away from the first waveguide plate 110. It should be noted that light of the first polarization direction entering the first waveguide plate 110 is partially transmitted by the first array beam splitter 180 to form transmitted light. Furthermore, because the first array beam splitter 180 redistributes the polarization of the transmitted light, light of the second polarization direction in the transmitted light is transmitted through the second polarization beam splitter 160 and exits the optical waveguide assembly 1000. However, this portion of the light beam that exits the optical waveguide assembly 1000 results in light waste and may leak image content transmitted in the optical waveguide assembly 1000, resulting in poor privacy.

[0056] Therefore, by arranging the fourth waveguide plate 170 on the side of the second polarization beam splitter 160 away from the first waveguide plate 110, the light beam transmitted from the second polarization beam splitter 160 will not be emitted from the optical waveguide component 1000, but will be totally reflected by the fourth waveguide plate 170 and enter the optical waveguide component 1000 again, thereby improving the light transmission efficiency of the optical waveguide component 1000 and improving the privacy of the optical waveguide component 1000.

[0057] Please follow Figure 2 In some optional embodiments, a second waveguide unit 200 is further included. The second waveguide unit 200 is aligned with the first waveguide unit 100, and the second waveguide unit 200 includes a fifth waveguide plate 210. It can be understood that the fifth waveguide plate 210 includes two surfaces that are opposite and parallel to each other. The alignment of the second waveguide unit 200 with the first waveguide unit 100 means that one surface of the fifth waveguide plate 210 is flush with the surface of the second waveguide plate 150 facing away from the first depolarizer 140, and the other surface of the fifth waveguide plate 210 is flush with the surface of the second polarization beam splitter 160 facing away from the first waveguide plate 110. Alternatively, when the first waveguide unit 100 includes a fourth waveguide plate 170, the other surface of the fifth waveguide plate 210 is flush with the surface of the fourth waveguide plate 170 facing away from the second polarization beam splitter 160.

[0058] Specifically, the optical waveguide assembly 1000 may include an incoupling element, through which light may enter the second waveguide unit 200, enter the first waveguide unit 100 after being totally reflected in the second waveguide unit 200, and be reflected by the first array beam splitter 180 before being coupled out from the first surface 111. Thus, by providing the second waveguide unit 200, the structure of the optical waveguide assembly 1000 may be simplified, the difficulty of manufacturing the optical waveguide assembly 1000 may be reduced, and the cost of the optical waveguide assembly 1000 may be reduced.

[0059] Please follow Figure 2 In some optional embodiments, a plurality of first waveguide units 100 and a plurality of second waveguide units 200 are provided, and the plurality of first waveguide units 100 and the plurality of second waveguide units 200 are alternately arranged. Specifically, the optical waveguide assembly 1000 may include two first waveguide units 100 and two second waveguide units 200. For example, the optical waveguide assembly 1000 may include a coupling element, and light may enter the second waveguide unit 200 through the coupling element, and then enter the first waveguide unit 100, the second waveguide unit 200, and the first waveguide unit 100 in sequence for transmission. The optical waveguide assembly 1000 may also include three first waveguide units 100 and three second waveguide units 200, etc.; the number of first waveguide units 100 and second waveguide units 200 may also be different. For example, the optical waveguide assembly 1000 may include three first waveguide units 100 and two second waveguide units 200, or the optical waveguide assembly 1000 may include two first waveguide units 100 and three second waveguide units 200, etc., and this is not limited in this embodiment of the present invention. The optical waveguide assembly 1000 may also include two first waveguide units 100 and one second waveguide unit 200. For example, light may enter the first waveguide unit 100 through the coupling element, then enter the second waveguide unit 200, and after being totally reflected in the second waveguide unit 200, enter the next first waveguide unit 100.

[0060] It should be noted that the light in the second polarization direction in the transmitted light transmitted from the first array spectrometer 180 enters the fourth waveguide plate 170 after being transmitted through the second polarization beam splitter 160. This part of the light in the second polarization direction may enter the first waveguide plate 110 again after being totally reflected in the fourth waveguide plate 170, thereby affecting the imaging effect of the optical waveguide component 1000.

[0061] In the embodiment of the present invention, the first waveguide unit 100 and the second waveguide unit 200 are alternately arranged in the optical waveguide assembly 1000. When the fourth waveguide plate 170 totally reflects the light of the second polarization direction and transmits the totally reflected light of the second polarization direction to the second waveguide unit 200, the second waveguide unit 200 again totally reflects the light of the second polarization direction, so that the light of the second polarization direction enters the first waveguide unit 100 again. In addition, the light of the second polarization direction becomes unpolarized light after passing through the first depolarizer 140. This is the same as the situation in which the unpolarized light enters the first polarization beam splitter 120 in the aforementioned embodiment, and will not be further described here.

[0062] Therefore, by alternately arranging the first waveguide units 100 and the second waveguide units 200 , the light utilization efficiency of the optical waveguide component 1000 can be improved, and at the same time, the imaging effect of the optical waveguide component 1000 can be further improved.

[0063] In some optional embodiments, the first waveguide plate 110, the second waveguide plate 150, the third waveguide plate 130, the fourth waveguide plate 170, and the fifth waveguide plate 210 are made of the same material. Thus, the waveguide plates are made of the same material and, therefore, have the same refractive index. This reduces the difficulty of controlling the light transmission angle, further reduces the difficulty of manufacturing the optical waveguide assembly 1000, and reduces the cost of the optical waveguide assembly 1000.

[0064] Please refer to Figure 3 In some optional embodiments, the optical waveguide assembly 1000 further includes a third waveguide unit 300, which is aligned with and alternately arranged with the first waveguide unit 100. The third waveguide unit 300 includes a seventh waveguide plate 350, a second depolarizer 340, a third polarization beam splitter 320, a sixth waveguide plate 310, a fourth polarization beam splitter 360, and an eighth waveguide plate 370, which are stacked in sequence. Aligning the third waveguide unit 300 with the first waveguide unit 100 means that the surface of the seventh waveguide plate 350 away from the third polarization beam splitter 320 is flush with the surface of the fourth waveguide plate 170 away from the second polarization beam splitter 160, and the surface of the eighth waveguide plate 370 away from the fourth polarization beam splitter 360 is flush with the surface of the second waveguide plate 150 away from the first depolarizer 140.

[0065] Furthermore, the sixth waveguide plate 310 includes a third surface 311 and a fourth surface 312 that are arranged opposite to and in parallel. The sixth waveguide plate 310 is aligned with the first waveguide plate 110. A second array spectrometer 380 is provided in the sixth waveguide plate 310, and the second array spectrometer 380 is arranged at an angle to the third surface 311 and the fourth surface 312; that is, the third surface 311 of the sixth waveguide plate 310 is aligned with the first surface 111 of the first waveguide plate 110, and the fourth surface 312 of the sixth waveguide plate 310 is aligned with the second surface 112 of the first waveguide plate 110.

[0066] Furthermore, a third polarization beam splitter 320 is arranged on the fourth surface 312, and the third polarization beam splitter 320 is used to transmit light in the first polarization direction and reflect light in the second polarization direction; specifically, the third polarization beam splitter 320 can also be an optical element such as a wire grid, and the structure of the third polarization beam splitter 320 can be the same as or different from the structure of the first polarization beam splitter 120, and the embodiment of the present invention does not limit this.

[0067] Furthermore, the second depolarizer 340 is arranged on the side of the third polarization beam splitter 320 away from the sixth waveguide plate 310, and the second depolarizer 340 is used to convert polarized light into non-polarized light; specifically, the second depolarizer 340 can be an optical element such as a phase delay plate or a depolarization film, and the embodiment of the present invention is not limited to this.

[0068] Furthermore, the seventh waveguide plate 350 is disposed on a side of the second depolarizer 340 away from the third polarization beam splitter 320 .

[0069] Furthermore, a fourth polarization beam splitter 360 is provided on the third surface 311, and the fourth polarization beam splitter 360 is used to transmit light in the second polarization direction and reflect light in the first polarization direction; specifically, the fourth polarization beam splitter 360 may also be an optical element such as a wire grid, and the structure of the fourth polarization beam splitter 360 may be the same as or different from the structure of the second polarization beam splitter 160, and this embodiment of the present invention does not limit this.

[0070] Furthermore, the eighth waveguide plate 370 is disposed on a side of the fourth polarization beam splitter 360 facing away from the sixth waveguide plate 310 .

[0071] It should be noted that after the fourth waveguide plate 170 totally reflects the light in the second polarization direction, the totally reflected light in the second polarization direction is transmitted to the third waveguide unit 300. At this time, the light in the second polarization direction becomes unpolarized light after passing through the second depolarizer 340. The unpolarized light is emitted to the third polarization beam splitter 320. The third polarization beam splitter 320 transmits the light in the first polarization direction and allows the light in the first polarization direction to enter the sixth waveguide plate 310. When the light in the first polarization direction enters the second array beam splitter 380, the second array beam splitter 380 can redistribute the polarization of the transmitted light beam, that is, the transmitted light now contains light in the first polarization direction and light in the second polarization direction. Among them, the light in the second polarization direction can be transmitted from the fourth polarization beam splitter 360 and emitted to the eighth waveguide plate 370. After being totally reflected by the eighth waveguide plate 370, it enters the next first waveguide unit 100 again.

[0072] Therefore, the optical waveguide component 1000 according to the embodiment of the present invention can improve the light utilization efficiency of the optical waveguide component 1000 by alternately arranging the first waveguide units 100 and the third waveguide units 300, and at the same time, further improve the imaging effect of the optical waveguide component 1000.

[0073] Please refer to Figure 3 In some optional embodiments, the third waveguide unit 300 further includes a ninth waveguide plate 330, which is disposed between the third polarization beam splitter 320 and the second depolarizer 340. That is, the third polarization beam splitter 320 and the second depolarizer 340 are respectively disposed on opposite sides of the ninth waveguide plate 330. Thus, the third polarization beam splitter 320 and the second depolarizer 340 can be respectively adhered to two opposite surfaces of the ninth waveguide plate 330, thereby simplifying the process of preparing the optical waveguide component 1000 and improving the stability of the optical waveguide component 1000.

[0074] In some optional embodiments, the first waveguide plate 110, the second waveguide plate 150, the third waveguide plate 130, the fourth waveguide plate 170, the sixth waveguide plate 310, the seventh waveguide plate 350, the eighth waveguide plate 370, and the ninth waveguide plate 330 are made of the same material. Thus, the waveguide plates are made of the same material and, therefore, have the same refractive index. This reduces the difficulty of controlling the light transmission angle, further reduces the difficulty of manufacturing the optical waveguide assembly 1000, and reduces the cost of the optical waveguide assembly 1000.

[0075] It should be noted that the structure of the third waveguide unit 300 is equivalent to the structure of the first waveguide unit 100 being flipped. Therefore, when manufacturing the optical waveguide assembly 1000, only the structure of the first waveguide unit 100 can be prepared, and the first waveguide unit 100 and the flipped first waveguide unit 100 are alternately bonded to form the optical waveguide assembly 1000, thereby further simplifying the structure of the optical waveguide assembly 1000, reducing the process difficulty of manufacturing the optical waveguide assembly 1000, and reducing the cost of the optical waveguide assembly 1000.

[0076] A near-eye display device according to an embodiment of the present invention includes a projection assembly and the optical waveguide assembly 1000 of the aforementioned embodiment. The projection assembly is used to project light, while the optical waveguide assembly 1000 is used to receive the light projected by the projection assembly and transmit it to the human eye. Thus, by providing the optical waveguide assembly 1000 of the aforementioned embodiment, the overall performance of the near-eye display device is improved.

[0077] Other structures and operations of the optical waveguide assembly 1000 and the near-eye display device according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0078] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0079] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0080] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0081] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0082] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 invention. 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0083] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An optical waveguide component, characterized in that: The optical waveguide assembly includes a first waveguide unit, wherein the first waveguide unit includes: a first waveguide plate, the first waveguide plate comprising a first surface and a second surface arranged opposite to each other, a first array beam splitter disposed in the first waveguide plate, the first array beam splitter being arranged at an angle to the first surface and the second surface, and the first array beam splitter being used to couple light transmitted in the first waveguide plate out of the first surface; a first polarization beam splitter, disposed on the first surface, configured to transmit light in a first polarization direction and reflect light in a second polarization direction; a first depolarizer, the first depolarizer being disposed on a side of the first polarization beam splitter facing away from the first waveguide plate, the first depolarizer being configured to convert polarized light into non-polarized light; a second waveguide plate, the second waveguide plate being arranged on a side of the first depolarizer away from the first polarization beam splitter; a second polarization beam splitter, the second polarization beam splitter being disposed on the second surface, the second polarization beam splitter being configured to transmit light in the second polarization direction and reflect light in the first polarization direction; The first polarization direction is perpendicular to the second polarization direction.

2. The optical waveguide assembly according to claim 1, wherein The first waveguide unit further includes a third waveguide plate, and the third waveguide plate is arranged between the first polarization beam splitter and the first depolarizer.

3. The optical waveguide assembly according to claim 2, wherein: The first waveguide unit further includes a fourth waveguide plate, and the fourth waveguide plate is arranged on a side of the second polarization beam splitter facing away from the first waveguide plate.

4. The optical waveguide assembly according to claim 3, wherein The optical waveguide assembly further includes a second waveguide unit, the second waveguide unit is aligned with the first waveguide unit, and the second waveguide unit includes a fifth waveguide plate.

5. The optical waveguide assembly according to claim 4, wherein A plurality of the first waveguide units and a plurality of the second waveguide units are provided, and the plurality of the first waveguide units and the plurality of the second waveguide units are alternately arranged.

6. The optical waveguide assembly according to claim 5, wherein: The first waveguide plate, the second waveguide plate, the third waveguide plate, the fourth waveguide plate and the fifth waveguide plate are made of the same material.

7. The optical waveguide assembly according to claim 3, wherein The optical waveguide assembly further includes a third waveguide unit, the third waveguide unit being aligned with and alternately arranged with the first waveguide unit, the third waveguide unit including: a sixth waveguide plate, the sixth waveguide plate comprising a third surface and a fourth surface disposed opposite each other, the sixth waveguide plate being aligned with the first waveguide plate, the sixth waveguide plate being provided with a second array of beam splitters, the second array of beam splitters being disposed at an angle to the third surface and the fourth surface; a third polarization beam splitter, the third polarization beam splitter being disposed on the fourth surface, the third polarization beam splitter being configured to transmit light in a first polarization direction and reflect light in a second polarization direction; a second depolarizer, the second depolarizer being arranged on a side of the third polarization beam splitter away from the sixth waveguide plate, the second depolarizer being configured to convert polarized light into non-polarized light; a seventh waveguide plate, the seventh waveguide plate being arranged on a side of the second depolarizer away from the third polarization beam splitter; a fourth polarization beam splitter, the fourth polarization beam splitter being disposed on the third surface, the fourth polarization beam splitter being configured to transmit light in the second polarization direction and reflect light in the first polarization direction; An eighth waveguide plate is disposed on a side of the fourth polarization beam splitter facing away from the sixth waveguide plate.

8. The optical waveguide assembly according to claim 7, wherein: The third waveguide unit further includes a ninth waveguide plate, and the ninth waveguide plate is disposed between the third polarization beam splitter and the second depolarizer.

9. The optical waveguide assembly according to claim 8, wherein The first waveguide plate, the second waveguide plate, the third waveguide plate, the fourth waveguide plate, the sixth waveguide plate, the seventh waveguide plate, the eighth waveguide plate and the ninth waveguide plate are made of the same material.

10. A near-eye display device, characterized in that: include: A projection component, configured to project light; The optical waveguide assembly according to any one of claims 1 to 9, wherein the optical waveguide assembly is configured to receive light projected by the projection assembly and transmit the light to a human eye.

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