Optical waveguide assembly and near-eye display device

Abstract

The invention discloses an optical waveguide assembly and a near-to-eye display device, the optical waveguide assembly comprises a first waveguide sheet and a second waveguide sheet which are stacked, and the first waveguide sheet is internally provided with a first pupil expanding structure; the first light path turning element is used for turning the light transmitted by the first pupil expanding structure into the second waveguide sheet; the second light path turning element is used for turning the light beam in the second waveguide sheet into the first waveguide sheet; and the third waveguide sheet is internally provided with a second pupil expanding structure, and the second pupil expanding structure is used for receiving the light rays reflected by the first pupil expanding structure, expanding the light rays along a second direction and coupling the light rays out of the third waveguide sheet so as to emit the light rays to human eyes. According to the optical waveguide assembly, coupled effective eye boxes are increased, and meanwhile the light utilization rate is improved.

Description

Technical Field

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

[0002] Augmented reality is a technology that integrates the real world and virtual information. It can simulate and apply computer-generated virtual information such as text, images, three-dimensional models, music and video to the real world to supplement the real information in the real world and achieve "enhancement" of the real world.

[0003] The main technologies used in near-eye display devices for augmented reality include: Birdbath, prism, free-form surface and optical waveguide technology. Among them, optical waveguide technology is obviously superior to other optical solutions due to its large eye movement range and its light and thin characteristics, and has become the mainstream path of major companies. However, the existing optical waveguide system has low optical efficiency. 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, which can increase the effective eye box of the outcoupling and improve the light utilization rate.

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

[0006] According to the optical waveguide component of the first aspect of the present invention, the optical waveguide component comprises:

[0007] A first waveguide plate, wherein a first pupil expansion structure is disposed in the first waveguide plate, and the first pupil expansion structure expands light in the first waveguide plate along a first direction;

[0008] a second waveguide sheet, the second waveguide sheet being stacked with the first waveguide sheet;

[0009] A first optical path turning element, which is disposed at one end of the first waveguide plate and the second waveguide plate, and is used to turn the light transmitted by the first pupil expansion structure into the second waveguide plate;

[0010] A second optical path turning element, the second optical path turning element is arranged at the other end opposite to the first waveguide plate and the second waveguide plate, and the second optical path turning element is used to turn the light beam in the second waveguide plate into the first waveguide plate;

[0011] A third waveguide plate is provided with a second pupil expansion structure, the second pupil expansion structure is used to receive the light reflected from the first pupil expansion structure, expand the light along a second direction and couple the light out of the third waveguide plate to emit to the human eye, and there is an angle between the first direction and the second direction.

[0012] In some embodiments, the first pupil expansion structure includes a plurality of first beam splitters, and the plurality of first beam splitters are arranged in parallel and spaced apart along a first direction.

[0013] In some embodiments, an air gap is provided between the first waveguide sheet and the second waveguide sheet which are stacked.

[0014] In some embodiments, the first optical path turning element includes a first reflecting surface and a second reflecting surface, and the light transmitted from the first pupil expansion structure is reflected by the first reflecting surface and then emitted to the second reflecting surface, and the second reflecting surface reflects the light and emits it to the second waveguide plate;

[0015] The second optical path turning element includes a third reflection surface and a fourth reflection surface. The third reflection surface receives the light emitted from the second waveguide plate and reflects it toward the fourth reflection surface. The fourth reflection surface reflects the light and emits it toward the first waveguide plate.

[0016] In some optional embodiments, the first light path turning element and the second light path turning element are isosceles right-angle prisms of the same shape.

[0017] In some optional embodiments, the first optical path turning element is bonded to one end of the first waveguide plate and the second waveguide plate by optical glue, and the second optical path turning element is bonded to the other opposite end of the first waveguide plate and the second waveguide plate by optical glue.

[0018] In some embodiments, a coupling element is further included, wherein the coupling element is disposed on a side of the first waveguide plate away from the second waveguide plate, and the coupling element is used to couple light into the first waveguide plate for total reflection transmission in the first waveguide plate.

[0019] In some embodiments, the first waveguide plate and the third waveguide plate are bonded together by glue.

[0020] In some embodiments, the second pupil expansion structure includes a plurality of second beam splitters, and the plurality of second beam splitters are arranged in parallel and spaced apart along a second direction.

[0021] According to the optical waveguide component of the present invention, a second waveguide plate is stacked with the first waveguide plate, and a first optical path turning element is set at one end of the first waveguide plate and the second waveguide plate, and a second optical path turning element is set at the other end opposite to the first waveguide plate and the second waveguide plate. Therefore, the transmitted light passing through the first pupil expansion structure can pass through the first optical path turning element, the second waveguide plate and the second optical path turning element, and then enter the first waveguide plate again, so that this part of the light can be utilized, thereby improving the utilization rate of the light. At the same time, when the transmitted light of the first pupil expansion structure enters the first waveguide plate again, since this part of the light has been reflected by the first optical path turning element, the second waveguide plate and the second optical path turning element, the optical path of this part of the light that passes through the first pupil expansion structure for the second time is offset relative to the optical path of the light that passes through the first pupil expansion structure for the first time. Therefore, when the light is recycled for multiple times, the light recycled each time will produce the same offset, and finally the light will cover the entire reflected light range of the first waveguide plate, thereby greatly increasing the effective eye box of the coupling.

[0022] A near-eye display device according to a second aspect of the present invention comprises:

[0023] An image source, the image source being used to emit light;

[0024] According to the optical waveguide component of the first aspect of the present invention, the light emitted by the image source is transmitted through total reflection by the optical waveguide component and then emitted toward the human eye.

[0025] 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.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of an optical waveguide in the prior art;

[0028] Figure 2 is a schematic diagram of a first waveguide according to an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of an optical waveguide assembly according to one embodiment of the present invention.

[0030] Reference numerals:

[0031] 1000: optical waveguide component; 100: first waveguide plate; 110: first pupil expansion structure; 111: first beam splitter; 121: first end; 122: second end; 123: third end; 124: fourth end; 125: first surface; 126 second surface; 200: second waveguide plate; 300: first optical path turning element; 310: first reflection surface; 320: second reflection surface; 400: second optical path turning element; 410: fourth reflection surface; 420: third reflection surface; 500: third waveguide plate; 510: second pupil expansion structure; 511: second beam splitter; 600: coupling element. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, 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 should not be construed as limiting the present invention.

[0033] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific processes and examples of materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0034] Reference below Figure 2-Figure 3 The optical waveguide assembly 1000 according to an embodiment of the present invention is described. The optical waveguide assembly 1000 includes a first waveguide plate 100, a second waveguide plate 200, a third waveguide plate 500, a first optical path turning element 300 and a second optical path turning element 400. The first waveguide plate 100 is a plate-shaped structure. The first waveguide plate 100 may include opposite first ends 121 and second ends 122, opposite third ends 123 and fourth ends 124, and opposite first surfaces 125 and second surfaces 126. Surface 126, the second waveguide plate 200 is stacked with the first waveguide plate 100, the second waveguide plate 200 can be stacked on the first surface 125 or the second surface 126 of the first waveguide plate 100, the first optical path turning element 300 is arranged at the first end 121 of the first waveguide plate 100, the second optical path turning element 400 is arranged at the second end 122 of the first waveguide plate 100, and the third waveguide plate 500 can be arranged at the third end 123 or the fourth end 124 of the first waveguide plate 100.

[0035] Furthermore, a first pupil expansion structure 110 is disposed in the first waveguide plate 100, and the first pupil expansion structure 110 is arranged along a first direction (eg Figure 3 Specifically, for example, the light in the first waveguide plate 100 is transmitted from the second end 122 to the first end 121. When the light is transmitted to the first pupil expansion structure 110, the first pupil expansion structure 110 expands and reflects a portion of the light along the first direction to form an expanded light and couples it out of the first waveguide plate 100 to emit to the third waveguide plate 500. The other portion of the light passes through the first pupil expansion structure 110 to form a transmitted light and continues to be transmitted forward, and is emitted from the first end 121 of the first waveguide plate 100 to emit to the first optical path turning element 300.

[0036] Furthermore, the second waveguide plate 200 is stacked with the first waveguide plate 100; the first optical path turning element 300 is arranged at one end of the first waveguide plate 100 and the second waveguide plate 200, and the first optical path turning element 300 is used to turn the light transmitted by the first pupil expansion structure 110 into the second waveguide plate 200; the second optical path turning element 400 is arranged at the other end opposite to the first waveguide plate 100 and the second waveguide plate 200, and the second optical path turning element 400 is used to turn the light in the second waveguide plate 200 into the first waveguide plate 100; it can be understood that the first optical path turning element 30 0 can be arranged at the first end 121 of the first waveguide plate 100, so that when the transmitted light passing through the first pupil expansion structure 110 is emitted from the first waveguide plate 100, the first light path turning element 300 can receive the transmitted light and turn the transmitted light to be emitted to the second waveguide plate 200, and the transmitted light is emitted to the second light path turning element 400 after being totally reflected and transmitted in the second waveguide plate 200, and the second light path turning element 400 receives the transmitted light and turns the transmitted light to the first waveguide plate 100 again, and passes through the first pupil expansion structure 110 again, so that the transmitted light can be utilized.

[0037] Furthermore, a second pupil expansion structure 510 is disposed in the third waveguide plate 500, and the second pupil expansion structure 510 is used to receive the light reflected from the first pupil expansion structure 110 and to direct the light along a second direction (eg Figure 3 The first direction and the second direction have an angle. It can be understood that the first pupil expansion structure 110 expands the light in the first waveguide plate 100 along the first direction and reflects it to form an expanded light and couples it out of the first waveguide plate 100 to the third waveguide plate 500. After the third waveguide plate 500 receives the expanded light, when the expanded light is transmitted to the second pupil expansion structure 510, the second pupil expansion structure 510 expands the expanded light again in the second direction, and reflects the expanded light to couple it out of the third waveguide plate 500, and finally enters the human eye.

[0038] It should be noted that the transmitted light passing through the first pupil expansion structure 110 enters the first waveguide plate 100 again after passing through the first optical path turning element 300, the second waveguide plate 200 and the second optical path turning element 400, and can pass through the first pupil expansion structure 110 again, and is expanded in the first direction by the first pupil expansion structure 110, and is emitted to the third waveguide plate 500. In addition, since the transmitted light passes through the first optical path turning element 300, the second waveguide plate 200 and the second optical path turning element 400, when it enters the first waveguide plate 100 again, its optical path will be offset, so that the effective eye box of the outcoupling can be increased.

[0039] Among them, the angle between the first direction and the second direction means that the first direction is not parallel to the second direction. Specifically, the first direction and the second direction can be perpendicular. Of course, the embodiment of the present invention is not limited to this, and the angle between the first direction and the second direction can also be 30°, 45°, 60°, 75°, etc.

[0040] like Figure 1 As shown, the inventors found in actual research that in the traditional waveguide solution, the angles between the coupled light at different angles and the beam splitting film layer are different, and the angles of the reflected light are also different. In the light path after reflection, for the light with a large angle range, there will be more pupil expansion redundancy. In the light path after reflection, only if Figure 1 As shown in the figure, there are light rays from three directions at the same time. In the subsequent outcoupling process, only the area within this range (eye box) can observe all the information of the coupled-in image, and there will be image loss in other positions. In the traditional design, it is necessary to continue to increase the width of the pupil expansion area to obtain a sufficiently large eye box range, but at the same time, light waste is inevitable.

[0041] In view of this, according to the optical waveguide component 1000 of the embodiment of the present invention, the second waveguide sheet 200 is stacked with the first waveguide sheet 100, and the first light path turning element 300 is arranged at one end of the first waveguide sheet 100 and the second waveguide sheet 200, and the second light path turning element 400 is arranged at the other end opposite to the first waveguide sheet 100 and the second waveguide sheet 200. Therefore, the transmitted light passing through the first pupil expansion structure 110 can pass through the first light path turning element 300, the second waveguide sheet 200 and the second light path turning element 400, and then enter the first waveguide sheet 100 again, so that this part of the light can be At the same time, when the transmitted light of the first pupil expansion structure 110 enters the first waveguide plate 100 again, since this part of the light is reflected by the first optical path turning element 300, the second waveguide plate 200 and the second optical path turning element 400, the optical path of this part of the light passing through the first pupil expansion structure 110 for the second time is offset from the optical path of the light passing through the first pupil expansion structure 110 for the first time. Therefore, when the light is recycled for multiple times, the light recycled each time will produce the same offset, and finally the light will cover the entire reflected light range of the first waveguide plate 100, thereby greatly increasing the effective eye box of the coupling.

[0042] It should be noted that the light passing through the first pupil expansion structure 110 enters the first waveguide plate 100 again through the first optical path turning element 300, the second waveguide plate 200 and the second optical path turning element 400, and when passing through the first pupil expansion structure 110 again, it will be split by the first pupil expansion structure 110 again, so that the transmitted light can be turned back multiple times between the first optical path turning element 300 and the second optical path turning element 400, so that as much light as possible can be expanded by the first pupil expansion structure 110 and reflected into the third waveguide plate 500, thereby improving the utilization rate of light.

[0043] Please continue to refer to Figure 2-Figure 3 In some embodiments, the first pupil expansion structure 110 includes a plurality of first beam splitters 111, and the plurality of first beam splitters 111 are arranged in parallel and spaced apart along a first direction. Thus, the first pupil expansion structure 110 is formed by the plurality of first beam splitters 111, the pupil expansion principle is simple, the design idea is relatively clear, the preparation technology is relatively mature, the optical imaging quality is high, and there is no color cast, thereby improving the imaging quality.

[0044] It is understandable that the first pupil expansion structure 110 may also be other structures, such as a grating, etc., and the embodiment of the present invention is not limited to this.

[0045] Please continue to refer to Figure 2-Figure 3In some embodiments, there is an air gap between the stacked first waveguide sheet 100 and the second waveguide sheet 200. It should be noted that, since the light needs to be transmitted by total reflection in the first waveguide sheet 100 and the second waveguide sheet 200, the first waveguide sheet 100 and the second waveguide sheet 200 need to meet the total reflection condition of the light. When there is an air gap between the first waveguide sheet 100 and the second waveguide sheet 200, since the refractive index of air is lower than the refractive index of the first waveguide sheet 100 and the refractive index of the second waveguide sheet 200, the light can be transmitted by total reflection in the first waveguide sheet 100 and the second waveguide sheet 200.

[0046] Therefore, there is an air gap between the stacked first waveguide plate 100 and the second waveguide plate 200, the optical waveguide component 1000 has a simple structure and can achieve total reflection transmission, further improving the light utilization rate.

[0047] In some other embodiments, the stacked first waveguide plate 100 and the second waveguide plate 200 may be bonded together by optical glue, but the refractive index of the optical glue needs to be lower than the refractive index of the first waveguide plate 100 and the refractive index of the second waveguide plate 200, so that light can be transmitted by total reflection in the first waveguide plate 100 and the second waveguide plate 200.

[0048] Please continue to refer to Figure 2-Figure 3 In some embodiments, the first optical path turning element 300 includes a first reflecting surface 310 and a second reflecting surface 320. The light transmitted from the first pupil expansion structure 110 is reflected by the first reflecting surface 310 and then emitted to the second reflecting surface 320. The second reflecting surface 320 reflects the light and emits it to the second waveguide plate 200. The second optical path turning element 400 includes a third reflecting surface 420 and a fourth reflecting surface 410. The third reflecting surface 420 receives the light emitted from the second waveguide plate 200 and reflects it to the fourth reflecting surface 410. The fourth reflecting surface 410 reflects the light and emits it to the first waveguide plate 100.

[0049] Specifically, for example, the first optical path turning element 300 may include a first reflector and a second reflector, the first reflector forms a first reflective surface 310, and the second reflector forms a second reflective surface 320, so that through the cooperation of the first reflector and the second reflector, the light transmitted by the first pupil expansion structure 110 is turned from the first waveguide plate 100 to the second waveguide plate 200. Similarly, the second optical path turning element 400 may include a third reflector and a fourth reflector, the third reflector forms a third reflective surface 420, and the fourth reflector forms a fourth reflective surface 410, so that through the cooperation of the third reflector and the fourth reflector, the light in the second waveguide plate 200 is turned again to the first waveguide plate 100.

[0050] Of course, the first optical path turning element 300 can also be other structures, as long as the first optical path turning element 300 includes the first reflection surface 310 and the second reflection surface 320, and the second optical path turning element 400 can also be other structures, as long as the second optical path turning element 400 includes the third reflection surface 420 and the fourth reflection surface 410. Therefore, the turning of the optical path can be achieved by only using the first reflection surface 310, the second reflection surface 320, the third reflection surface 420 and the fourth reflection surface 410, which is conducive to the simplification of the structure of the optical waveguide component 1000.

[0051] Please continue to refer to Figure 2-Figure 3 In some optional embodiments, the first optical path turning element 300 and the second optical path turning element 400 are isosceles right prisms of the same shape. Specifically, when the first optical path turning element 300 is an isosceles right prism, the bottom surface of the isosceles right prism can be arranged close to the first waveguide plate 100 and the second waveguide plate 200, one isosceles surface of the isosceles right prism can be the first reflection surface 310, and the other isosceles surface of the isosceles right prism can be the second reflection surface 320. Similarly, when the second optical path turning element 400 is also an isosceles right prism, the bottom surface of the isosceles right prism can be arranged close to the first waveguide plate 100 and the second waveguide plate 200, one isosceles surface of the isosceles right prism can be the third reflection surface 420, and the other isosceles surface of the isosceles right prism can be the fourth reflection surface 410. Therefore, by setting the first optical path turning element 300 and the second optical path turning element 400 as isosceles right-angle prisms of the same shape, the optical waveguide component 1000 has a simple structure and a regular shape, which is conducive to the simplification of the structure of the optical waveguide component 1000.

[0052] Furthermore, a reflective layer may be provided on the two isosceles surfaces of the isosceles right-angle prism by coating or coating, thereby preventing light from emitting from the isosceles right-angle prism out of the optical waveguide assembly 1000, and further improving the light utilization rate of the optical waveguide assembly 1000. The first optical path turning element 300 and the second optical path turning element 400 may also be prisms of other shapes, which are not limited in the embodiment of the present invention.

[0053] Please continue to refer to Figure 2-Figure 3In some optional embodiments, the first optical path turning element 300 is bonded to one end of the first waveguide plate 100 and the second waveguide plate 200 by optical glue, and the second optical path turning element 400 is bonded to the other opposite end of the first waveguide plate 100 and the second waveguide plate 200 by optical glue. It should be noted that in order to ensure the total reflection transmission effect of the light in the first waveguide plate 100 and the second waveguide plate 200, an air gap is usually arranged between the first waveguide plate 100 and the second waveguide plate 200 to ensure that the light can meet the total reflection transmission condition when it is transmitted in the first waveguide plate 100 and the second waveguide plate 200, that is, the light is emitted from the optically dense medium to the optically sparse medium. At this time, when the first optical path turning element 300 is bonded to one end of the first waveguide plate 100 and the second waveguide plate 200 by optical glue, and the second optical path turning element 400 is bonded to the other end opposite to the first waveguide plate 100 and the second waveguide plate 200 by optical glue, the position of the first waveguide plate 100 and the second waveguide plate 200 can be fixed, thereby enhancing the structural stability of the optical waveguide component 1000 and further improving the imaging quality of the optical waveguide component 1000.

[0054] Specifically, when the first optical path turning element 300 is an isosceles right-angle prism and the second optical path turning element 400 is also an isosceles right-angle prism, the bottom surfaces of the two isosceles right-angle prisms are respectively bonded to opposite ends of the first waveguide plate 100 and the second waveguide plate 200 .

[0055] Please continue to refer to Figure 2-Figure 3 In some embodiments, a coupling element 600 is further included. The coupling element 600 is disposed on a side of the first waveguide sheet 100 away from the second waveguide sheet 200. The coupling element 600 is used to couple the light into the first waveguide sheet 100 so as to transmit the light through total reflection in the first waveguide sheet 100. Specifically, for example, when the second waveguide sheet 200 is stacked on the first surface 125 of the first waveguide sheet 100, the coupling element 600 can be disposed on the second surface 126 of the first waveguide sheet 100. The coupling element 600 can be a prism or a grating, etc., which is not limited in the embodiment of the present invention. Therefore, by using the coupling element 600 to couple the light into the first waveguide sheet 100, the structure of the optical waveguide assembly 1000 is simple, which is conducive to optimizing the structural design of the product.

[0056] Please continue to refer to Figure 2-Figure 3 In some embodiments, the first waveguide sheet 100 and the third waveguide sheet 500 are bonded together by glue. Therefore, bonding the first waveguide sheet 100 and the third waveguide sheet 500 together can improve the structural stability of the optical waveguide assembly 1000, thereby further improving the imaging quality of the optical waveguide assembly 1000.

[0057] It should be noted that the first waveguide 100 expands the light along the first direction through the first pupil expansion structure 110, and couples the expanded light out of the first waveguide 100. The coupled expanded light enters the third waveguide 500 and is transmitted by total reflection in the third waveguide 500. When transmitted to the second pupil expansion structure 510, the second pupil expansion structure 510 expands the expanded light again along the second direction, and couples the expanded light again out of the third waveguide 500, and finally shoots it toward the human eye.

[0058] Since the expanded light in the first waveguide plate 100 needs to be transmitted to the third waveguide plate 500 , bonding the first waveguide plate 100 and the third waveguide plate 500 together can also reduce light loss, thereby further improving the light utilization rate of the optical waveguide component 1000 .

[0059] In some other embodiments, the first waveguide plate 100 and the third waveguide plate 500 can also be formed into one piece through an integrated molding process, thereby further reducing the loss of the extended light from the first waveguide plate 100 entering the third waveguide plate 500, and further improving the light utilization rate of the optical waveguide component 1000.

[0060] Please continue to refer to Figure 2-Figure 3 In some embodiments, the second pupil expansion structure 510 includes a plurality of second beam splitters 511, and the plurality of second beam splitters 511 are arranged in parallel and spaced apart along the second direction. Thus, the plurality of second beam splitters 511 can expand the pupil of the light totally reflected in the third waveguide plate 500 along the second direction, and the second pupil expansion structure 510 is formed by the plurality of second beam splitters 511. The pupil expansion principle is simple, the design idea is relatively clear, the preparation technology is relatively mature, the optical imaging quality is high, and there is no color cast, thereby improving the imaging quality.

[0061] According to the second aspect of the present invention, the near-eye display device comprises an image source and the above-mentioned optical waveguide component 1000, wherein the image source is used to emit light; the light emitted by the image source is transmitted by total reflection through the optical waveguide component 1000 and then emitted to the human eye.

[0062] Specifically, the image source can be a display module with a backlight unit such as LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode) or Micro-LED, or a display module without a backlight unit such as LCOS (Liquid Crystal on Silicon) or DMD (Digital Micromirror Device), which can be flexibly selected according to the needs of use. Furthermore, the near-eye display device can also include an optical system, which can be used to collimate and correct the light emitted by the image source before emitting it to the optical waveguide component 1000.

[0063] The working process of the near-eye display device provided by the embodiment of the present invention is as follows:

[0064] The image source emits image light, which enters the first waveguide plate 100 through the coupling element 600 and is transmitted through total reflection in the first waveguide plate 100. When transmitted to the first pupil expansion structure 110, the first pupil expansion structure 110 expands and reflects a portion of the light in a first direction to form an expanded light and couples out of the first waveguide plate 100 to emit to the third waveguide plate 500. Another portion of the light passes through the first pupil expansion structure 110 to form a transmitted light and continues to transmit forward, and is emitted from one end of the first waveguide plate 100 to emit to the first optical path turning element 300. The first optical path turning element 300 converts the transmitted light into a light beam. The light path is turned to the second waveguide plate 200, and the transmitted light is transmitted through total reflection in the second waveguide plate 200 and then emitted to the second light path turning element 400. The second light path turning element 400 receives the transmitted light and turns the transmitted light to the first waveguide plate 100. When the transmitted light enters the first waveguide plate 100 again and passes through the first pupil expansion structure 110 again, it is split again, so that the transmitted light can be turned back between the first light path turning element 300 and the second light path turning element 400 for many times, so that as many lights as possible are expanded by the first pupil expansion structure 110 and reflected to the third waveguide plate 500. In addition, the expanded light entering the third waveguide plate 500 is transmitted through total reflection in the third waveguide plate 500. When it is transmitted to the second pupil expansion structure 510, the second pupil expansion structure 510 expands the expanded light again along the second direction, and couples the expanded light out of the third waveguide plate 500 to enter the human eye.

[0065] It can be understood that the optical path of the light that is turned back multiple times between the first optical path turning element 300 and the second optical path turning element 400 will be offset, so that the light will eventually cover the entire waveguide range as much as possible. Therefore, within the range covered by the first pupil expansion structure 110, there will be light that is coupled out from the first waveguide plate 100 after the pupil is expanded, thereby greatly increasing the effective eye box of the coupling without increasing the area of ​​the pupil expansion plate, and at the same time improving the light utilization rate.

[0066] According to the near-eye display device of the present invention, the optical waveguide assembly 1000 of the first aspect is provided, thereby improving the overall performance of the near-eye display device.

[0067] 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 known to those skilled in the art and will not be described in detail here.

[0068] 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 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0073] Although the 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 present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An optical waveguide component, characterized in that: The optical waveguide assembly comprises: A first waveguide plate, wherein a first pupil expansion structure is disposed in the first waveguide plate, and the first pupil expansion structure expands light in the first waveguide plate along a first direction; a second waveguide sheet, the second waveguide sheet being stacked with the first waveguide sheet; A first optical path turning element, which is disposed at one end of the first waveguide plate and the second waveguide plate, and is used to turn the light transmitted by the first pupil expansion structure into the second waveguide plate; A second optical path turning element, the second optical path turning element is arranged at the other end opposite to the first waveguide plate and the second waveguide plate, and the second optical path turning element is used to turn the light beam in the second waveguide plate into the first waveguide plate; A third waveguide plate is provided with a second pupil expansion structure, the second pupil expansion structure is used to receive the light reflected from the first pupil expansion structure, expand the light along a second direction and couple the light out of the third waveguide plate to emit to the human eye, and there is an angle between the first direction and the second direction.

2. The optical waveguide assembly according to claim 1, characterized in that The first pupil expansion structure includes a plurality of first beam splitters, and the plurality of first beam splitters are arranged in parallel and spaced apart along a first direction.

3. The optical waveguide assembly according to claim 1, wherein: An air gap is provided between the first waveguide plate and the second waveguide plate which are stacked.

4. The optical waveguide assembly according to claim 1, wherein: The first optical path turning element comprises a first reflecting surface and a second reflecting surface, the light transmitted from the first pupil expansion structure is reflected by the first reflecting surface and then emitted to the second reflecting surface, and the second reflecting surface reflects the light and emits it to the second waveguide plate; The second optical path turning element includes a third reflection surface and a fourth reflection surface. The third reflection surface receives the light emitted from the second waveguide plate and reflects it toward the fourth reflection surface. The fourth reflection surface reflects the light and emits it toward the first waveguide plate.

5. The optical waveguide assembly according to claim 4, characterized in that The first light path turning element and the second light path turning element are isosceles right-angle prisms of the same shape.

6. The optical waveguide assembly according to claim 5, characterized in that The first optical path turning element is bonded to one end of the first waveguide plate and the second waveguide plate by optical glue, and the second optical path turning element is bonded to the other end opposite to the first waveguide plate and the second waveguide plate by optical glue.

7. The optical waveguide assembly according to claim 1, wherein: The invention also includes a coupling element, which is arranged on a side of the first waveguide plate away from the second waveguide plate, and is used to couple light into the first waveguide plate so as to transmit light by total reflection in the first waveguide plate.

8. The optical waveguide assembly according to claim 1, wherein: The first waveguide plate and the third waveguide plate are bonded together by glue.

9. The optical waveguide assembly according to claim 1, wherein: The second pupil expansion structure includes a plurality of second beam splitters, and the plurality of second beam splitters are arranged in parallel and spaced apart along a second direction.

10. A near-eye display device, characterized in that: include: An image source, the image source being used to emit light; According to the optical waveguide component according to any one of claims 1 to 9, the light emitted by the image source is transmitted through total reflection by the optical waveguide component and then emitted to the human eye.

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