Laminating method and laminating device for manufacturing full-color optical waveguide

Abstract

The invention belongs to the technical field of full-color optical waveguides, and discloses a laminating method and a laminating device for manufacturing a full-color optical waveguide, and the method comprises the steps: simulating the light transmission process of each waveguide sheet in a display product, and obtaining an output image; calculating optimal parameters (rotation angles and movement distances of part of waveguide sheets) required when two parts (each part comprises at least one waveguide sheet) of waveguide sheets are attached and view fields are completely overlapped according to the actual size of the obtained image, and finally adjusting and fixing the relative positions of the two parts of waveguide sheets according to the calculated optimal parameters. Therefore, pairing and fitting of all the waveguide sheets in the full-color optical waveguide can be rapidly completed, the production efficiency is improved, the production cost is reduced, view fields of all the waveguide sheets of the obtained full-color optical waveguide can be accurately overlapped, and the ghosting phenomenon is effectively avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of full-color optical waveguides, and specifically relates to a bonding method and a bonding device for manufacturing full-color optical waveguides. Background Art

[0002] As a key technology in augmented reality (AR) and virtual reality (VR), full-color optical waveguide technology plays a vital role in achieving high-resolution, high-brightness, and high-color saturation display effects. However, despite the broad prospects of this technology, it faces many pain points in the actual application and manufacturing process, especially in the bonding process of full-color optical waveguides. These problems not only affect the display effect of the product, but also significantly increase production costs and reduce production efficiency.

[0003] One of the core challenges of full-color optical waveguides is how to effectively manage the decoupling process of red, green, and blue light. Ideally, each color of light should be precisely coupled out at a specific angle and intensity through its corresponding decoupling grating, so as to achieve a display effect with accurate color and uniform brightness. However, the reality is far from this. Since the wavelength difference between green light and red and blue light is relatively small, when these lights are coupled out in the same waveguide, they will not only be coupled out by their corresponding decoupling gratings, but also by decoupling gratings corresponding to other colors of light. Specifically, red and blue light may be coupled out by the green decoupling grating, and green light may be coupled out by the red decoupling grating and the blue decoupling grating. Due to the angular selectivity of the decoupling grating, the angles at which the same color light is coupled out by the decoupling gratings corresponding to different colors of light are inconsistent, which in turn generates a large amount of stray light and causes serious crosstalk problems.

[0004] To address this challenge, one possible solution is to use two or three waveguides bonded together to form a full-color optical waveguide. In this design, green light is usually transmitted and coupled out separately through one waveguide, while red and blue light are transmitted and coupled out through another or two waveguides. This design can effectively reduce mutual interference between light, reduce the generation of stray light and crosstalk, and thus improve the display effect. However, this solution also brings new challenges.

[0005] In the actual production process, the field of view (FOV) of a single waveguide often has a certain error from the optical design value due to the limitation of processing accuracy. When these waveguides are paired and bonded to form a full-color optical waveguide, their respective FOV errors will cause the FOV of the full-color optical waveguide to not accurately overlap. This FOV misalignment is manifested as obvious ghosting in image testing, that is, the observer will see multiple overlapping images, which seriously affects the visual experience.

[0006] In addition to affecting the display effect, FOV misalignment also brings about the problem of low production efficiency. Since it is necessary to ensure that the FOV of the full-color optical waveguide can accurately overlap, a lot of testing and pairing work is required during the production process. These tasks are not only time-consuming and labor-intensive, but also require highly professional skills and experience. Even so, due to the existence of FOV errors, it often takes many attempts and adjustments to find a waveguide combination with overlapping FOV. This not only increases production costs, but also significantly prolongs the production cycle and reduces production efficiency. Summary of the invention

[0007] The present invention aims to overcome at least one defect in the prior art and provide a bonding method and a bonding device for making a full-color optical waveguide, which are used to solve the problem that it is difficult to overlap the field of view during the waveguide bonding process.

[0008] In order to solve the above technical problems, the following technical solutions are adopted: In a first aspect, a bonding method for manufacturing a full-color optical waveguide is provided. If the full-color optical waveguide includes a first waveguide plate for transmitting a first light and a second waveguide plate for transmitting a second light, the wavelength ranges of the first light and the second light are different, the first waveguide plate is provided with at least a first coupling grating for coupling in the first light and a first coupling grating for coupling out the first light, and the second waveguide plate is provided with at least a second coupling grating for coupling in the second light and a second coupling grating for coupling out the second light; the method includes the following steps: At the second position, an image beam is projected onto the first waveguide plate at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating to form a first image, and an initial actual size of the first image is acquired at the third position, including the initial actual size in the X direction. x 1 and the initial actual size in the Y direction y 1; Projecting an image beam at a second position toward a second waveguide plate at a first position, coupling a second light ray in the image beam into the second waveguide plate from a second coupling-in grating, and finally coupling out of the second waveguide plate from a second coupling-out grating to form a second image, and acquiring an initial actual size of the second image at a third position, including an initial actual size in the X direction x 2 and the initial actual size in the Y direction y 2; pre-bonding the first waveguide sheet and the second waveguide sheet; Let the second waveguide rotate around the axis parallel to the Y direction by an angle ± α , and rotate around an axis parallel to the X direction by an angle ± β , so that the actual size of the second image is consistent with the actual size of the first image; Projecting an image beam at the second position toward the first waveguide plate and the second waveguide plate at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, and simultaneously a second light ray in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, to form a fourth image, and acquiring an initial actual size of the fourth image at the third position, including an initial actual size in the X direction x 4 and the initial actual size in the Y direction y 4; Move the second waveguide plate along the X direction by a distance of ± a , and move along the Y direction by a distance of ± b , so that the actual size of the fourth image is consistent with the actual size of the first image; Injecting glue between the first waveguide sheet and the second waveguide sheet to make the first waveguide sheet fit the second waveguide sheet; The relative positions of the first position, the second position and the third position remain consistent during the bonding process, the X direction and the Y direction are perpendicular to each other, and the pre-bonding refers to making the two pre-bonded objects close to each other and set at a distance; the angle α satisfy: α =|arccos( x 0 / x 1)-arccos( x 0 / x 2)|, where x 0 is the theoretical size of the first image and the second image in the X direction; angle β satisfy: β =|arccos( y 0 / y 1)-arccos( y 0 / y 2)|, where y 0 is the theoretical size of the first image and the second image in the Y direction; a satisfy: a =| x 4- x 1|;Distance b satisfy: b =| y 4- y 1|.

[0009] Preferably, the second waveguide is rotated about an axis parallel to the Y direction by an angle ± α , and rotate around an axis parallel to the X direction by an angle ± β , the step of making the actual size of the second image consistent with the actual size of the first image includes: Projecting an image beam at a second position to a second waveguide plate at a first position, so that a second light in the image beam is coupled into the second waveguide plate from a second coupling-in grating, and finally coupled out of the second waveguide plate from a second coupling-out grating to form a second image, and monitoring an actual size of the second image in real time at a third position, including an actual size in an X direction and an actual size in a Y direction; The second waveguide is rotated around an axis parallel to the Y direction by an angle α , and rotates around an axis parallel to the X direction by an angle β ; Determine whether the actual size of the second image in the X direction is the same as the initial actual size of the first image in the X direction x 1; if not, the second waveguide is rotated around an axis parallel to the Y direction by an angle of -2 α ; Determine whether the actual size of the second image in the Y direction is the same as the initial actual size of the first image in the Y direction y 1; if not, the second waveguide is rotated around an axis parallel to the X direction by an angle of -2 β .

[0010] Preferably, the second waveguide is moved along the X direction by a distance of ± a , and move along the Y direction by a distance of ± b The step of making the actual size of the fourth image consistent with the actual size of the first image includes: Projecting an image beam at the second position to the first waveguide plate and the second waveguide plate at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, and simultaneously a second light ray in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, to form a fourth image, and monitoring the actual size of the fourth image in real time at the third position, including the actual size in the X direction and the actual size in the Y direction; Move the second waveguide in the X direction by a distance a , and move along the Y direction b ; Determine whether the actual size of the fourth image in the X direction is the same as the initial actual size of the first image in the X direction x 1; if not, move the second waveguide along the X direction by a distance of -2 a ; Determine whether the actual size of the fourth image in the Y direction is the same as the initial actual size of the first image in the Y direction y 1; if not, move the second waveguide along the Y direction by a distance of -2 b .

[0011] If the full-color optical waveguide further includes a third waveguide plate for transmitting a third light, the wavelength range of the third light is different from that of the first light and the second light, and the third waveguide plate is provided with at least a third coupling-in grating for coupling-in the third light and a third coupling-out grating for coupling-out the third light; then the method further includes the following steps: Projecting an image beam at the second position to the third waveguide plate at the first position, so that a third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating to form a third image, and obtaining an initial actual size of the third image at the third position, including an initial actual size in the X direction x 3 and the initial actual size in the Y direction y 3; pre-bonding the third waveguide sheet to the first waveguide sheet and the second waveguide sheet; Let the third waveguide rotate around the axis parallel to the Y direction by an angle ± i , and rotate around an axis parallel to the X direction by an angle ± d , making the actual size of the third image consistent with the actual size of the first image, the second image or the fourth image; At the second position, an image beam is projected onto the first waveguide plate, the second waveguide plate, and the third waveguide plate located at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, so that a second light ray in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, and at the same time, a third light ray in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating, so as to form a fifth image, and an initial actual size of the fifth image is acquired at the third position, including an initial actual size in the X direction. x 5 and the initial actual size in the Y direction y 5; Move the third waveguide plate along the X direction by a distance of ± c , and move along the Y direction by a distance of ± d , making the actual size of the fifth image consistent with the actual size of the first image, the second image or the fourth image; Injecting glue between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet to make the first waveguide sheet fit the second waveguide sheet / the third waveguide sheet; Among them, the angle i satisfy: i =|arccos( x 0 / x 1)-arccos( x 0 / x 3)|, where x 0 is the theoretical size of the first image, the second image, and the third image in the X direction; angle d satisfy: d =|arccos( y 0 / y 1)-arccos( y 0 / y 3)|, where y 0 is the theoretical size of the first image, the second image, and the third image in the Y direction; c satisfy: c =| x 5- x 1|;Distance d satisfy: d =| y 5- y 1|.

[0012] Alternatively, the method further comprises the following steps: Projecting an image beam at the second position to the third waveguide plate at the first position, so that a third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating to form a third image, and obtaining an initial actual size of the third image at the third position, including an initial actual size in the X direction x 3 and the initial actual size in the Y direction y 3; Pre-bonding the third waveguide sheet to the bonded first waveguide sheet and the second waveguide sheet; The first waveguide plate and the second waveguide plate that have been bonded are rotated by an angle ± about an axis parallel to the Y direction. i , and rotate around an axis parallel to the X direction by an angle ± d , making the actual size of the first image, the second image or the fourth image consistent with the actual size of the third image; At the second position, an image beam is projected onto the first waveguide plate, the second waveguide plate, and the third waveguide plate located at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, so that a second light ray in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, and at the same time, a third light ray in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating, so as to form a fifth image, and an initial actual size of the fifth image is acquired at the third position, including an initial actual size in the X direction. x 5 and the initial actual size in the Y direction y 5; Move the first waveguide and the second waveguide that have been bonded together along the X direction by a distance of ± c , and move along the Y direction by a distance of ± d , so that the actual size of the fifth image is consistent with the actual size of the third image; Injecting glue between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet to make the first waveguide sheet, the second waveguide sheet and the third waveguide sheet fit together; Among them, the angle i satisfy: i =|arccos( x 0 / x 1)-arccos( x 0 / x 3)|, where x 0 is the theoretical size of the first image, the second image, and the third image in the X direction; angle d satisfy: d =|arccos( y 0 / y 1)-arccos( y 0 / y 3)|, where y 0 is the theoretical size of the first image, the second image, and the third image in the Y direction; c satisfy: c =| x 5- x 1|;Distance d satisfy: d =| y 5- y 1|.

[0013] In the second aspect, a bonding device for making a full-color optical waveguide is proposed, which includes a fixture, an optical machine and a camera, and applies the above bonding method.

[0014] If the full-color optical waveguide includes a first waveguide plate for transmitting a first light ray and a second waveguide plate for transmitting a second light ray, the wavelength ranges of the first light ray and the second light ray are different, the first waveguide plate is at least provided with a first coupling-in grating for coupling in the first light ray and a first coupling-out grating for coupling out the first light ray, and the second waveguide plate is at least provided with a second coupling-in grating for coupling in the second light ray and a second coupling-out grating for coupling out the second light ray; the fixture is used for loading and positioning the first waveguide plate and / or the second waveguide plate to the first position, and is also used for rotating or moving the second waveguide plate; the optical machine is used for projecting an image beam to the first waveguide plate and / or the second waveguide plate located at the first position at the second position; and the camera is used for acquiring the initial actual size of the first image, the second image or the fourth image at the third position.

[0015] If the full-color optical waveguide also includes a third waveguide plate for transmitting a third light ray, the wavelength range of the third light ray is different from that of the first light ray and the second light ray, and the third waveguide plate is provided with at least a third coupling-in grating for coupling-in the third light ray and a third coupling-out grating for coupling-out the third light ray; the fixture is also used for loading and positioning the third waveguide plate, or the first waveguide plate, the second waveguide plate and the third waveguide plate to the first position, and is also used for rotating or moving the third waveguide plate or the first waveguide plate and the second waveguide plate that have been bonded; the optical machine is also used for projecting an image beam at the second position to the third waveguide plate, or the first waveguide plate, the second waveguide plate and the third waveguide plate located at the first position; and the camera is also used for acquiring the initial actual size of the third image or the fifth image at the third position.

[0016] Preferably, the jig includes a first jig and a second jig, the first jig is used to load and position the first waveguide sheet, the second waveguide sheet, the third waveguide sheet or the first waveguide sheet and the second waveguide sheet that have been bonded together, and the second jig is used to load and rotate and move the second waveguide sheet, the third waveguide sheet or the first waveguide sheet and the second waveguide sheet that have been bonded together.

[0017] Preferably, the first fixture is also used to grab and move the first waveguide sheet, the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first position; or the device also includes a first grabbing mechanism, and the first grabbing mechanism is used to grab and move the first waveguide sheet, the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first fixture.

[0018] Preferably, the second fixture is also used to grab and move the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first position; or the device also includes a second grabbing mechanism, which is used to grab and move the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the second fixture.

[0019] Preferably, the camera is also used to monitor the actual size of the first image, the second image, the third image, the fourth image or the fifth image in real time.

[0020] Preferably, the device further comprises a glue dispenser for injecting glue between the first waveguide sheet and the second waveguide sheet, between the third waveguide sheet and the first waveguide sheet, or between the third waveguide sheet and the second waveguide sheet.

[0021] Compared with the prior art, this solution has the following beneficial effects: this solution simulates the light transmission process of each waveguide sheet in the display product and obtains the image outputted therefrom, and then calculates the optimal parameters (including the rotation angle and movement distance of some waveguide sheets) required when two parts (each part includes at least one sheet) of waveguide sheets are bonded and the fields of view completely overlap according to the actual size of the acquired image, and finally adjusts and fixes the relative positions of the two parts of the waveguide sheets according to the calculated optimal parameters, thereby being able to quickly complete the pairing and bonding of the waveguide sheets in the full-color optical waveguide, which not only improves production efficiency but also reduces production costs. The fields of view of the waveguide sheets of the full-color optical waveguide thus obtained can also be accurately overlapped, effectively avoiding ghosting. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are for illustrative purposes only and should not be construed as limitations on the present invention. In order to better illustrate the present invention, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0023] Figure 1 It is a schematic diagram of the structure and optical path of a two-piece full-color optical waveguide.

[0024] Figure 2 It is a schematic diagram of the structure and optical path of a three-piece full-color optical waveguide.

[0025] Figure 3 It is a flow chart of a bonding method for manufacturing a two-piece full-color optical waveguide.

[0026] Figure 4 It is a flow chart of a bonding method for producing a three-piece full-color optical waveguide.

[0027] Figure 5 It is a flow chart of another bonding method for making a three-piece full-color optical waveguide.

[0028] Figure 6 It is a schematic diagram of the structure of a bonding device for making a full-color optical waveguide.

[0029] Explanation of the reference numerals: optical machine 100, full-color optical waveguide 200, first waveguide plate 210, first coupling-in grating 211, first coupling-out grating 212, second waveguide plate 220, second coupling-in grating 221, second coupling-out grating 222, third waveguide plate 230, third coupling-in grating 231, third coupling-out grating 232, camera 300, fixture 400, first fixture 410, second fixture 420. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present solution, the present solution is further described in detail below in conjunction with specific embodiments.

[0031] Figure 1~Figure 2 The figure shows a possible full-color optical waveguide and a corresponding display product. The display product is configured with an optical machine 100 and a full-color optical waveguide 200. The optical machine 100 is similar to a projector, and projects a color image beam with a virtual image into the full-color optical waveguide 200. The full-color optical waveguide 200 transmits and couples the color image beam from the optical machine 100 into the human eye, forming a color virtual image, and realizing different effects such as virtual reality (VR), augmented reality (AR), and mixed reality (MR).

[0032] The full-color optical waveguide 200 transmits light of different wavelength ranges through different waveguide plates, so that light of the same wavelength range can only be coupled out by the same grating, which can effectively avoid crosstalk. Figure 1 As shown, the full-color optical waveguide 200 may include a first waveguide plate 210 and a second waveguide plate 220, wherein the first waveguide plate 210 is used to transmit the first light, and the second waveguide plate 220 is used to transmit the second light. Figure 2 As shown, the full-color optical waveguide 200 may further include a third waveguide plate 230, and the third waveguide plate 230 is used to transmit a third light. The difference between the first light, the second light, and the third light is that their wavelength ranges are different. For example, if the full-color optical waveguide 200 is composed of the first waveguide plate 210 and the second waveguide plate 220, the first light may be red light and blue light, and the second light may be green light; if the full-color optical waveguide 200 is composed of the first waveguide plate 210, the second waveguide plate 220, and the third waveguide plate 230, the first light may be red light, the second light may be green light, and the third light may be blue light.

[0033] The first waveguide plate 210, the second waveguide plate 220 and the third waveguide plate 230 may be collectively referred to as waveguide plates, which are used to realize the back and forth reflection propagation of light. The waveguide plate generally has a total reflection critical angle θ c , the absolute value of the incident angle exceeds the critical angle of total reflection θ c When the light irradiates the surface of the waveguide plate in the waveguide plate, it can be completely reflected back by the surface of the waveguide plate, so as to propagate along the extension direction of the waveguide plate in the form of back and forth reflection in the waveguide plate. The first waveguide plate 210 is provided with a first coupling-in grating 211 and a first coupling-out grating 212, and a first turning grating can also be provided. The second waveguide plate 220 is provided with a second coupling-in grating 221 and a second coupling-out grating 222, and a second turning grating can also be provided. The third waveguide plate 230 is provided with a third coupling-in grating 231 and a third coupling-out grating 232, and a third turning grating can also be provided.

[0034] The first coupling grating 211, the second coupling grating 221 and the third coupling grating 231 can be collectively referred to as coupling gratings, which are used to achieve the coupling of light. When the light is emitted to the full-color optical waveguide 200, the absolute value of its incident angle is usually less than the total reflection critical angle θ of the waveguide plate. c, and cannot be reflected back and forth in the waveguide. The coupling grating can diffract the light and change its incident angle, so that the absolute value of the incident angle of the light exceeds the critical angle of total reflection of the waveguide θ c , so that it can be reflected and propagated back and forth in the waveguide plate, thereby achieving the coupling of light. Specifically, the first coupling grating 211 can couple the first light in the image light beam into the first waveguide plate 210, the second coupling grating 221 can couple the second light in the image light beam into the second waveguide plate 220, and the third coupling grating 231 can couple the third light in the image light beam into the third waveguide plate 230.

[0035] The first outcoupling grating 212, the second outcoupling grating 222 and the third outcoupling grating 232 may be collectively referred to as outcoupling gratings, which are used to achieve outcoupling of light. When light is reflected back and forth in the waveguide, the absolute value of its incident angle exceeds the critical angle θ of total reflection of the waveguide. c , when the light is irradiated to the surface of the waveguide, it will be reflected back into the waveguide and cannot be emitted outside the waveguide. The outcoupling grating can diffract the light and change its incident angle, so that the absolute value of the incident angle of the light is less than the critical angle θ of total reflection of the waveguide. c , so that it can be emitted out of the waveguide plate, thereby achieving light outcoupling, and at the same time expanding the light beam range in one direction to achieve one-dimensional pupil expansion. Specifically, the first outcoupling grating 212 can couple the first light out of the first waveguide plate 210, the second outcoupling grating 222 can couple the second light out of the second waveguide plate 220, and the third outcoupling grating 232 can couple the third light out of the third waveguide plate 230.

[0036] The first turning grating, the second turning grating and the third turning grating can be collectively referred to as turning gratings, which are used to realize the turning of light. In the process of light propagating from the coupling-in grating to the coupling-out grating in the waveguide, the turning grating can diffract the light from the coupling-in grating and change its propagation direction in the waveguide, so that the light propagates toward the coupling-out grating, and at the same time amplifies the range of the light beam in another direction, and cooperates with the coupling-out grating to realize two-dimensional pupil expansion. Specifically, the first turning grating can change the propagation direction of the first light in the first waveguide 210, the second turning grating can change the propagation direction of the second light in the second waveguide 220, and the third turning grating can change the propagation direction of the third light in the third waveguide 230. The coupling-in grating, the coupling-out grating and the turning grating can all use volume holographic gratings.

[0037] In the process of manufacturing the full-color optical waveguide 200, the first waveguide sheet 210, the second waveguide sheet 220 and the third waveguide sheet 230 (if any) are processed and formed respectively, and then the first waveguide sheet 210, the second waveguide sheet 220 and the third waveguide sheet 230 (if any) are bonded together by glue dispensing. After bonding, the first waveguide sheet 210, the second waveguide sheet 220 and the third waveguide sheet 230 (if any) are stacked, the first coupling grating 211, the second coupling grating 221 and the third coupling grating 231 (if any) are stacked, and the first coupling grating 212, the second coupling grating 222 and the third coupling grating 232 (if any) are stacked, so that the first light, the second light and the third light (if any) in the image light beam can be respectively coupled by the first coupling grating 211, the second coupling grating 222 and the third coupling grating 232 from the same area of ​​the full-color optical waveguide 200. 21. The third coupling-in grating 231 (if any) is coupled into the first waveguide plate 210, the second waveguide plate 220, and the third waveguide plate 230 (if any). Finally, the first coupling-out grating 212, the second coupling-out grating 222, and the third coupling-out grating 232 (if any) are coupled out of the first waveguide plate 210, the second waveguide plate 220, and the third waveguide plate 230 (if any) from the same area of ​​the full-color optical waveguide 200, respectively, and the first image, the second image, and the third image (if any) are projected respectively. These images are superimposed on each other to form a colorful virtual image.

[0038] Figure 3~Figure 5 The bonding method for making the full-color optical waveguide is illustrated. This method can be used to quickly achieve the pairing bonding of two or more waveguide sheets, so that the field of view (FOV) of the full-color optical waveguide obtained can be accurately overlapped, which helps to improve the production efficiency of the full-color optical waveguide and reduce the production cost. Figure 3 As shown, the method may include the following steps.

[0039] S110: projecting an image beam at the second position to the first waveguide plate at the first position, so that a first light in the image beam is coupled into the first waveguide plate from the first coupling grating, and finally coupled out of the first waveguide plate from the first coupling grating to form a first image, and acquiring an initial actual size of the first image at the third position, including the initial actual size in the X direction x 1 and the initial actual size in the Y direction y 1.

[0040] In the display product, the optical machine projects an image beam to the full-color optical waveguide, so that each light in the image beam can be coupled into the corresponding waveguide plate by the corresponding coupling grating, and finally coupled out of the waveguide plate by the corresponding coupling grating, and enter the human eye, so that the human eye can see the virtual image. In the image beam, the first light is transmitted through the first waveguide plate and outputs the first image, the second light is transmitted through the second waveguide plate and outputs the second image, and the third light is transmitted through the third waveguide plate (if any) and outputs the third image. The superposition of the first image, the second image and the third image (if any) is the virtual image seen by the human eye. This step simulates the imaging process of the first light in the image beam being transmitted through the first waveguide plate and outputting the first image, so as to obtain the initial actual size of the first image. The device that projects the image beam to the first waveguide plate at the second position can be an optical machine, and the device that obtains the initial actual size of the first image at the third position can be a camera.

[0041] In the imaging process of the display product, the relative positions of the full-color optical waveguide, the optical machine, and the human eye affect the size of the virtual image seen by the human eye. Similarly, in this step and other subsequent steps, the relative positions of the first position, the second position, and the third position also affect the size of the image transmitted by each light beam in the image beam through each waveguide plate and output. In order to avoid the relative position from becoming an interference factor in the image size, the relative positions of the first position, the second position, and the third position remain consistent throughout the bonding process. The relative positions of the first position, the second position, and the third position can be determined according to the positions of the coupled-in and coupled-out image beams in the full-color optical waveguide before executing the bonding method. Unlike the relative position, the absolute positions of the first position, the second position, and the third position can be flexibly adjusted, that is, the first position, the second position, and the third position can be migrated as a whole.

[0042] Whether it is the first image in this step, or the second image, third image, fourth image, and fifth image in the subsequent steps, their initial actual sizes can be expressed as x i × y i To express, x i represents the initial actual size of the i-th image in the X direction, y i represents the initial actual size of the i-th image in the Y direction, x i and y i The i in the image is represented by Arabic numerals, the i in the i-th image is represented by Chinese characters, and the X direction is perpendicular to the Y direction.

[0043] S120: projecting an image beam at the second position to the second waveguide plate at the first position, so that a second light in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating to form a second image, and acquiring an initial actual size of the second image at a third position, including an initial actual size in the X direction x 2 and the initial actual size in the Y direction y 2.

[0044] This step simulates the imaging process of the second light in the image beam being transmitted through the second waveguide plate and outputting the second image, so as to obtain the initial actual size of the second image. The device for projecting the image beam to the second waveguide plate at the second position may be an optical machine, and the device for obtaining the initial actual size of the second image at the third position may be a camera.

[0045] S130: pre-bonding the first waveguide sheet and the second waveguide sheet.

[0046] Theoretically, as long as the first waveguide sheet and the second waveguide sheet processed and formed strictly according to the optical design value are aligned and bonded, a full-color optical waveguide in which the first image and the second image are precisely overlapped can be obtained. In other words, the first image and the second image are not only consistent in theoretical size, but also completely overlap in theoretical position. However, due to difficult-to-control factors such as processing errors, the first image and the second image output by the full-color optical waveguide obtained by direct alignment and bonding often do not overlap, which manifests as an obvious ghosting phenomenon in the image test. Adjusting the relative position of the first waveguide sheet and the second waveguide sheet can make the first image and the second image coincide precisely. In order to facilitate the adjustment of the relative position of the two to be bonded, this step only brings the first waveguide sheet and the second waveguide sheet close to each other, and there is no actual contact between the first waveguide sheet and the second waveguide sheet, so as to avoid collision and damage or even damage during the adjustment process. For the convenience of description, this case defines the operation of bringing the two to be pre-bonded close to each other and setting them apart as pre-bonding.

[0047] S140: Rotate the second waveguide plate around an axis parallel to the Y direction by an angle ± α , and rotate around an axis parallel to the X direction by an angle ± β , so that the actual size of the second image is consistent with the actual size of the first image.

[0048] When adjusting the relative position of the first waveguide plate and the second waveguide plate, the positional relationship between the first waveguide plate and the second waveguide plate can be adjusted by rotating the second waveguide plate, so that the plane where the first waveguide plate is located is parallel to or intersects with the plane where the second waveguide plate is located, so that the actual size of the second image is consistent with the actual size of the first image. Since the first waveguide plate is not rotated, the actual size of the first image is its initial actual size.

[0049] Specifically, the second waveguide rotates around an axis parallel to the Y direction by an angle of +α or- α After that, the actual size of the second image in the X direction will be the same as the actual size of the first image in the X direction (initial actual size x 1) Consistent. If the second waveguide rotates around an axis parallel to the Y direction by an angle of + α After that, the actual size of the second image in the X direction is the same as the actual size of the first image in the X direction (initial actual size x 1) If they are not consistent, the second waveguide should be rotated around an axis parallel to the Y direction by an angle of - α ;vice versa.

[0050] Similarly, the second waveguide rotates around an axis parallel to the X direction by an angle of + β or- β After that, the actual size of the second image in the Y direction will be the same as the actual size of the first image in the Y direction (initial actual size y 1) Consistent. If the second waveguide rotates around an axis parallel to the X direction by an angle + β After that, the actual size of the second image in the Y direction is the same as the actual size of the first image in the Y direction (initial actual size y 1) If they are not consistent, the second waveguide should be rotated around an axis parallel to the X direction by an angle of - β ;vice versa.

[0051] Therefore, step S140 may include the following steps: S141: projecting an image beam at the second position to the second waveguide plate at the first position, so that a second light in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating to form a second image, and monitoring the actual size of the second image in real time at the third position, including the actual size in the X direction and the actual size in the Y direction; S142: Rotate the second waveguide plate around an axis parallel to the Y direction by an angle of + α , and rotate around an axis parallel to the X direction by an angle + β ; S143: Determine the actual size of the second image in the X direction and the initial actual size of the first image in the X direction x 1 is consistent; if not, the second waveguide is rotated around the axis parallel to the Y direction by an angle of -2 α ; S144: Determine the actual size of the second image in the Y direction and the initial actual size of the first image in the Y direction y 1 is consistent; if not, the second waveguide is rotated around the axis parallel to the X direction by an angle of -2 β .

[0052] Step S141 simulates the imaging process of the second light in the image beam being transmitted through the second waveguide plate and outputting the second image, so as to monitor the actual size of the second image in real time. The device that projects the image beam to the second waveguide plate at the second position may be an optical machine, and the device that monitors the actual size of the second image in real time at the third position may be a camera.

[0053] The angle of rotation of the second waveguide α satisfy: α =|arccos( x 0 / x 1)-arccos( x 0 / x 2)|, and the angle β satisfy: β =|arccos( y 0 / y 1)-arccos( y 0 / y 2)|. Among them, x 0 represents the theoretical size of the first image and the second image in the X direction. y 0 is the theoretical size of the first image and the second image in the Y direction. The theoretical sizes of the first image and the second image in the X direction and the Y direction can be calculated based on the size of the virtual image output by the image beam output device such as the optical machine, and the parameters of the acquisition device such as the camera (ignoring the distortion error caused by the acquisition device such as the camera).

[0054] S150: projecting an image beam at the second position toward the first waveguide plate and the second waveguide plate at the first position, so that the first light in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, and at the same time, the second light in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, so as to form a fourth image, and acquiring the initial actual size of the fourth image at the third position, including the initial actual size in the X direction x 4 and the initial actual size in the Y direction y 4.

[0055] This step simulates the imaging process in which the first light in the image beam is transmitted through the first waveguide plate and outputs the first image, and the second light is transmitted through the second waveguide plate and outputs the second image, so as to obtain the initial actual size of the fourth image, which is formed by superimposing the first image and the second image. The device that projects the image beam to the first waveguide plate and the second waveguide plate at the second position may be an optical machine, and the device that obtains the initial actual size of the fourth image at the third position may be a camera.

[0056] S160: Move the second waveguide plate along the X direction by a distance of ± a , and move along the Y direction by a distance of ±b , so that the actual size of the fourth image is consistent with the actual size of the first image.

[0057] After adjusting the positional relationship between the first waveguide plate and the second waveguide plate by rotating the second waveguide plate, the actual size of the second image becomes consistent with the actual size of the first image, but the position of the second image may not completely coincide with the position of the first image. At this time, by moving the second waveguide plate to adjust the relative position of the first waveguide plate and the second waveguide plate, the position of the second image can be completely coincident with the position of the first image. The fourth image is formed by superimposing the first image and the second image. When the actual sizes of the first image and the second image are consistent and the positions completely coincide, the actual size of the fourth image is consistent with the actual size of the first image. In other words, the actual size of the fourth image is consistent with the actual size of the first image, which means that the position of the second image completely coincides with the position of the first image.

[0058] Specifically, the second waveguide moves along the X direction by a distance of + a or- a After that, the actual size of the fourth image in the X direction will be the same as the actual size of the first image in the X direction (initial actual size x 1) Consistent. If the second waveguide moves along the X direction by a distance + a After that, the actual size of the fourth image in the X direction is the same as the actual size of the first image in the X direction (initial actual size x 1) If not, the second waveguide should be moved in the X direction by a distance - a ; and vice versa. The distance the second waveguide moves a satisfy: a =| x 4- x 1|.

[0059] Similarly, the second waveguide moves along the Y direction by a distance of + b or- b After that, the actual size of the fourth image in the Y direction will be the same as the actual size of the first image in the Y direction (initial actual size y 1) Consistent. If the second waveguide moves along the Y direction by a distance of + b After that, the actual size of the fourth image in the Y direction is equal to the actual size of the first image in the Y direction (initial actual size y 1) If not, the second waveguide should be moved in the Y direction by a distance of - b ; and vice versa. The distance the second waveguide moves b satisfy: b =| y 4- y 1|.

[0060] Therefore, step S160 may include the following steps: S161: projecting an image beam at the second position toward the first waveguide plate and the second waveguide plate at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, and at the same time, a second light ray in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, to form a fourth image, and monitoring the actual size of the fourth image in real time at the third position, including the actual size in the X direction and the actual size in the Y direction; S162: Move the second waveguide plate along the X direction a , and move along the Y direction b ; S163: Determine the actual size of the fourth image in the X direction and the initial actual size of the first image in the X direction x 1 is consistent; if not, move the second waveguide along the X direction by a distance of -2 a ; S164: Determine the actual size of the fourth image in the Y direction and the initial actual size of the first image in the Y direction y 1 is consistent; if not, move the second waveguide plate along the Y direction by a distance of -2 b .

[0061] Step S161 simulates the imaging process in which the first light in the image beam is transmitted through the first waveguide plate and outputs the first image, and the second light is transmitted through the second waveguide plate and outputs the second image, so as to monitor in real time the actual size of the fourth image, which is formed by superimposing the first image and the second image. The device that projects the image beam to the first waveguide plate and the second waveguide plate at the second position may be an optical machine, and the device that monitors in real time the actual size of the fourth image at the third position may be a camera.

[0062] S170: injecting glue between the first waveguide sheet and the second waveguide sheet to make the first waveguide sheet and the second waveguide sheet fit together.

[0063] After processing from steps S110 to S160, the first image formed by the image light beam transmitted through the first waveguide plate and the second image formed by the image light beam transmitted through the second waveguide plate can be accurately overlapped. As long as the relative positions of the first waveguide plate and the second waveguide plate are fixed at this time, a full-color optical waveguide with accurately overlapping fields of view can be obtained.

[0064] After the glue is injected between the first waveguide sheet and the second waveguide sheet, the glue injected between the first waveguide sheet and the second waveguide sheet can be cured by natural curing, heat curing, light curing, etc. After the glue injected between the first waveguide sheet and the second waveguide sheet is cured, the relative position of the first waveguide sheet and the second waveguide sheet is fixed, thereby achieving the bonding of the first waveguide sheet and the second waveguide sheet.

[0065] In the above steps S110 to S170, the execution order of steps S110, S120 and S130 can be swapped, as long as they are completed before executing steps S140 to S170.

[0066] For a three-piece full-color optical waveguide configured with a first waveguide plate, a second waveguide plate and a third waveguide plate, the bonding process requires not only bonding the first waveguide plate to the second waveguide plate, but also bonding the third waveguide plate to the first waveguide plate and the second waveguide plate. Figure 4 A bonding method for manufacturing a three-piece full-color optical waveguide is illustrated. The method may include not only the above steps S110 to S170, but also steps S210 to S260.

[0067] S210: projecting an image beam at the second position to the third waveguide plate at the first position, so that a third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating to form a third image, and obtaining an initial actual size of the third image at the third position, including the initial actual size in the X direction x 3 and the initial actual size in the Y direction y 3.

[0068] This step simulates the imaging process of the third light in the image beam being transmitted through the third waveguide and outputting the third image, so as to obtain the initial actual size of the third image. The device for projecting the image beam to the third waveguide at the second position may be an optical machine, and the device for obtaining the initial actual size of the third image at the third position may be a camera.

[0069] S220: pre-bonding the third waveguide sheet to the first waveguide sheet and the second waveguide sheet.

[0070] Theoretically, as long as the third waveguide sheet processed and formed strictly according to the optical design value is aligned and bonded with the first waveguide sheet and the second waveguide sheet, a full-color optical waveguide in which the third image accurately overlaps with the first image and the second image can be obtained. In other words, the third image is not only consistent with the first image and the second image in theoretical size, but also completely overlaps in theoretical position. However, due to factors that are difficult to control, such as processing errors, the third image output by the full-color optical waveguide obtained by direct alignment and bonding often does not overlap with the first image and the second image, which manifests as an obvious ghosting phenomenon in the image test. Adjusting the relative position of the third waveguide sheet with the first waveguide sheet and the second waveguide sheet can make the third image accurately overlap with the first image and the second image. In this step, the third waveguide sheet is pre-bonded with the first waveguide sheet and the second waveguide sheet, so that the relative position of the third waveguide sheet with the first waveguide sheet and the second waveguide sheet can be adjusted in the subsequent steps S230 and S250.

[0071] S230: Rotate the third waveguide plate around an axis parallel to the Y direction by an angle ± i , and rotate around an axis parallel to the X direction by an angle ± d , so that the actual size of the third image is consistent with the actual size of the first image, the second image or the fourth image.

[0072] When adjusting the relative position of the third waveguide sheet to the first waveguide sheet and the second waveguide sheet, the positional relationship between the third waveguide sheet and the first waveguide sheet and the second waveguide sheet can be adjusted by rotating the third waveguide sheet, so that the plane where the third waveguide sheet is located is parallel to or intersects with the plane where the first waveguide sheet and the second waveguide sheet are located, thereby making the actual size of the third image consistent with the actual size of the first image, the second image or the fourth image. Since the first waveguide sheet is not rotated, the actual size of the first image is its initial actual size; after the processing of steps S140 to S160, the actual sizes of the second image and the fourth image are also the same as the actual size of the first image; therefore, the actual size of the first image, the second image or the fourth image is the same as the initial actual size of the first image.

[0073] Specifically, the third waveguide rotates around an axis parallel to the Y direction by an angle of + i or- i After that, the actual size of the third image in the X direction will be the same as the actual size of the first image, the second image or the fourth image in the X direction (the initial actual size of the first image in the X direction). x 1) Consistent. If the third waveguide rotates around an axis parallel to the Y direction by an angle of + i After that, the actual size of the third image in the X direction is equal to the actual size of the first image, the second image or the fourth image in the X direction (the initial actual size of the first image in the X direction). x 1) If they are not consistent, the third waveguide should be rotated around an axis parallel to the Y direction by an angle of - i ;vice versa.

[0074] Similarly, the third waveguide rotates around an axis parallel to the X direction by an angle of + d or- d After that, the actual size of the third image in the Y direction will be the same as the actual size of the first image, the second image, or the fourth image in the Y direction (the initial actual size of the first image in the Y direction). y 1) Consistent. If the third waveguide rotates around an axis parallel to the X direction by an angle + d After that, the actual size of the third image in the Y direction is equal to the actual size of the first image, the second image or the fourth image in the Y direction (the initial actual size of the first image in the Y direction). y 1) If they are not consistent, the third waveguide should be rotated around an axis parallel to the X direction by an angle of - d ;vice versa.

[0075] Therefore, step S230 may include the following steps: S231: projecting an image beam at the second position to the third waveguide plate at the first position, so that a third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating to form a third image, and monitoring the actual size of the third image in real time at the third position, including the actual size in the X direction and the actual size in the Y direction; S232: Rotate the third waveguide plate around an axis parallel to the Y direction by an angle of + i , and rotate around an axis parallel to the X direction by an angle + d ; S233: Determine the actual size of the third image in the X direction and the initial actual size of the first image in the X direction x 1 is consistent; if not, the third waveguide is rotated around the axis parallel to the Y direction by an angle of -2 i ; S234: Determine the actual size of the third image in the Y direction and the initial actual size of the first image in the Y direction y 1 is consistent; if not, the third waveguide is rotated around the axis parallel to the X direction by an angle of -2 d .

[0076] Step S231 simulates the imaging process of the third light in the image beam being transmitted through the third waveguide and outputting the third image, so as to monitor the actual size of the third image in real time. The device that projects the image beam to the third waveguide at the second position may be an optical machine, and the device that monitors the actual size of the third image in real time at the third position may be a camera.

[0077] The angle of rotation of the third waveguide i satisfy: i =|arccos( x 0 / x 1)-arccos( x 0 / x 3)|, and the angle d satisfy: d =|arccos( y 0 / y 1)-arccos( y 0 / y 3)|. Among them, x 0 represents the theoretical size of the first image, the second image, and the third image in the X direction. y 0 represents the theoretical size of the first image, the second image, and the third image in the Y direction. The theoretical sizes of the first image, the second image, and the third image in the X direction and the Y direction are consistent, which can be calculated based on the size of the virtual image output by the image beam output device such as the optical machine, and the parameters of the acquisition device such as the camera (ignoring the distortion error caused by the acquisition device such as the camera).

[0078] S240: Projecting an image beam at the second position to the first waveguide plate, the second waveguide plate, and the third waveguide plate located at the first position, so that the first light in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, so that the second light in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, and at the same time, the third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating, so as to form a fifth image, and acquiring the initial actual size of the fifth image at the third position, including the initial actual size in the X direction. x 5 and the initial actual size in the Y direction y 5.

[0079] This step simulates the imaging process in which the first light in the image beam is transmitted through the first waveguide plate and outputs the first image, the second light is transmitted through the second waveguide plate and outputs the second image, and the third light is transmitted through the third waveguide plate and outputs the third image, so as to obtain the initial actual size of the fifth image, which is formed by superimposing the third image with the first image and the second image. The device that projects the image beam to the first waveguide plate, the second waveguide plate and the third waveguide plate at the second position may be an optical machine, and the device that obtains the initial actual size of the fifth image at the third position may be a camera.

[0080] S250: Move the third waveguide plate along the X direction by a distance of ± c , and move along the Y direction by a distance of ± d , so that the actual size of the fifth image is consistent with the actual size of the first image, the second image or the fourth image.

[0081] After the positional relationship between the third waveguide plate and the first waveguide plate and the second waveguide plate is adjusted by rotating the third waveguide plate, the actual size of the third image becomes consistent with the actual size of the first image, the second image, and the fourth image, but the position of the third image may not completely overlap with the positions of the first image, the second image, and the fourth image. At this time, by moving the third waveguide plate to adjust the relative position of the third waveguide plate and the first waveguide plate and the second waveguide plate, the position of the third image can be completely overlapped with the positions of the first image, the second image, and the fourth image. The fifth image is formed by superimposing the third image with the first image and the second image, and the first image and the second image are superimposed to form the fourth image, so it can also be said that the fifth image is formed by superimposing the third image with the fourth image. After the processing of steps S140 to S160, the first image, the second image, and the fourth image not only have the same actual size but also completely overlap in position. Therefore, when the actual size of the third image is consistent with the actual size of the first image, the second image, and the fourth image and the position completely overlaps, the actual size of the fifth image is consistent with the actual size of the first image, the second image, and the fourth image. In other words, the actual size of the fifth image is consistent with the actual size of the first image, the second image or the fourth image, which means that the position of the third image completely overlaps with the positions of the first image, the second image and the fourth image.

[0082] Specifically, the third waveguide moves along the X direction by a distance of + c or- c After that, the actual size of the fifth image in the X direction will be the same as the actual size of the first image, the second image or the fourth image in the X direction (the initial actual size of the first image in the X direction). x 1) Consistent. If the third waveguide moves along the X direction by a distance of + c After that, the actual size of the fifth image in the X direction is equal to the actual size of the first image, the second image or the fourth image in the X direction (the initial actual size of the first image in the X direction). x 1) If they are not consistent, the third waveguide should be moved along the X direction by a distance of - c ; and vice versa. The distance the third waveguide moves is c satisfy: c =| x 5- x 1|.

[0083] Similarly, the third waveguide moves along the Y direction by a distance of + d or- d After that, the actual size of the fifth image in the Y direction will be the same as the actual size of the first image, the second image or the fourth image in the Y direction (the initial actual size of the first image in the Y direction). y 1) Consistent. If the third waveguide moves along the Y direction by a distance of + dAfter that, the actual size of the fifth image in the Y direction is equal to the actual size of the first image, the second image or the fourth image in the Y direction (the initial actual size of the first image in the Y direction). y 1) If they are not consistent, the third waveguide should be moved along the Y direction by a distance of - d ; and vice versa. The distance the third waveguide moves is d satisfy: d =| y 5- y 1|.

[0084] Therefore, step S250 may include the following steps: S251: projecting an image beam at the second position to the first waveguide plate, the second waveguide plate and the third waveguide plate at the first position, so that the first light in the image beam is coupled into the first waveguide plate from the first coupling-in grating and finally coupled out of the first waveguide plate from the first coupling-out grating, so that the second light in the image beam is coupled into the second waveguide plate from the second coupling-in grating and finally coupled out of the second waveguide plate from the second coupling-out grating, and at the same time, the third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating and finally coupled out of the third waveguide plate from the third coupling-out grating, so as to form a fifth image, and monitoring the actual size of the fifth image in real time at the third position, including the actual size in the X direction and the actual size in the Y direction; S252: Move the third waveguide plate along the X direction c , and move along the Y direction d ; S253: Determine the actual size of the fifth image in the X direction and the initial actual size of the first image in the X direction x 1 is consistent; if not, move the third waveguide along the X direction by a distance of -2 c ; S254: Determine the actual size of the fifth image in the Y direction and the initial actual size of the first image in the Y direction y 1 is consistent; if not, move the third waveguide along the Y direction by a distance of -2 d .

[0085] Step S251 simulates the imaging process in which the first light in the image beam is transmitted through the first waveguide plate and outputs the first image, the second light is transmitted through the second waveguide plate and outputs the second image, and the third light is transmitted through the third waveguide plate and outputs the third image, so as to monitor the actual size of the fifth image in real time, and the fifth image is formed by superimposing the third image with the first image and the second image. The device that projects the image beam to the first waveguide plate, the second waveguide plate and the third waveguide plate at the second position may be an optical machine, and the device that monitors the actual size of the fifth image in real time at the third position may be a camera.

[0086] S260: injecting glue between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet to make the first waveguide sheet and the second waveguide sheet / the third waveguide sheet fit together.

[0087] After the processing of steps S110 to S160 and steps S210 to S250, the third image formed by the image light beam transmitted through the third waveguide plate, the first image formed by the image light beam transmitted through the first waveguide plate, and the second image formed by the image light beam transmitted through the second waveguide plate can be accurately overlapped. As long as the relative positions of the third waveguide plate and the first waveguide plate and the second waveguide plate are fixed at this time, a full-color optical waveguide with accurately overlapping fields of view can be obtained.

[0088] After the glue is injected between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet, the glue injected between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet can be cured by natural curing, heat curing, light curing, etc. After the glue injected between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet is cured, the relative position of the third waveguide sheet and the first waveguide sheet and the second waveguide sheet is fixed, thereby achieving the bonding of the third waveguide sheet with the first waveguide sheet and the second waveguide sheet.

[0089] In the above steps S210 to S260, the execution order of steps S210 and S220 can be swapped, as long as they are completed before executing steps S230 to S260.

[0090] Figure 5 Another bonding method for manufacturing a three-piece full-color optical waveguide is illustrated. The method may include not only the above steps S110 to S170, but also steps S310 to S360.

[0091] S310: projecting an image beam at the second position to the third waveguide plate at the first position, so that a third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating to form a third image, and obtaining an initial actual size of the third image at the third position, including the initial actual size in the X direction x 3 and the initial actual size in the Y direction y 3.

[0092] This step simulates the imaging process of the third light in the image beam being transmitted through the third waveguide and outputting the third image, so as to obtain the initial actual size of the third image. The device for projecting the image beam to the third waveguide at the second position may be an optical machine, and the device for obtaining the initial actual size of the third image at the third position may be a camera.

[0093] S320: Pre-bonding the third waveguide plate to the already bonded first waveguide plate and second waveguide plate.

[0094] Theoretically, as long as the first waveguide sheet, the second waveguide sheet and the third waveguide sheet that are processed and formed strictly according to the optical design value are aligned and bonded, a full-color optical waveguide in which the first image, the second image and the third image are precisely overlapped can be obtained. In other words, the first image, the second image and the third image are not only consistent in theoretical size, but also completely overlap in theoretical position. However, due to factors that are difficult to control, such as processing errors, the first image, the second image and the third image output by the full-color optical waveguide obtained by direct alignment and bonding often do not overlap, which is manifested as an obvious ghosting phenomenon in the image test. Adjusting the relative positions of the first waveguide sheet, the second waveguide sheet and the third waveguide sheet can make the first image, the second image and the third image precisely overlap. In this step, the third waveguide sheet is pre-bonded with the already bonded first waveguide sheet and the second waveguide sheet, so that the relative positions of the third waveguide sheet and the already bonded first waveguide sheet and the second waveguide sheet can be adjusted in the subsequent steps S330 and S350.

[0095] S330: Rotate the bonded first waveguide plate and the second waveguide plate around an axis parallel to the Y direction by an angle ± i , and rotate around an axis parallel to the X direction by an angle ± d , so that the actual size of the first image, the second image or the fourth image is consistent with the actual size of the third image.

[0096] When adjusting the relative position of the third waveguide sheet and the first and second waveguide sheets that have been bonded, the positional relationship between the third waveguide sheet and the first and second waveguide sheets that have been bonded can be adjusted by rotating the first and second waveguide sheets that have been bonded, so that the plane where the first and second waveguide sheets that have been bonded are located is parallel to or intersects with the plane where the third waveguide sheet is located, thereby making the actual size of the first image, the second image or the fourth image consistent with the actual size of the third image. After the processing of steps S140 to S160, the actual sizes of the first image, the second image and the fourth image have become consistent, and the comparison of any one of them with the actual size of the third image can be used as a condition for judging whether the bonded first and second waveguide sheets have been rotated to the right position. Since the third waveguide sheet has not been rotated, the actual size of the third image is its initial actual size.

[0097] Specifically, the first waveguide plate and the second waveguide plate have been attached to rotate around an axis parallel to the Y direction by an angle of + i or- i After that, the actual size of the first image, the second image or the fourth image in the X direction will be the same as the actual size of the third image in the X direction (initial actual size x 3) Consistent. If the first waveguide and the second waveguide are already attached, the rotation angle around the axis parallel to the Y direction is + i After that, the actual size of the first image, the second image or the fourth image in the X direction is equal to the actual size of the third image in the X direction (initial actual size x3) If they are not consistent, the first waveguide and the second waveguide that have been bonded should be rotated around an axis parallel to the Y direction by an angle of - i ;vice versa.

[0098] Similarly, the first waveguide plate and the second waveguide plate that have been bonded are rotated around an axis parallel to the X direction by an angle of + d or- d After that, the actual size of the first image, the second image or the fourth image in the Y direction will be the same as the actual size of the third image in the X direction (initial actual size y 3) Consistent. If the first waveguide and the second waveguide are already bonded, the angle of rotation around the axis parallel to the X direction is + d After that, the actual size of the first image, the second image or the fourth image in the Y direction is equal to the actual size of the third image in the Y direction (initial actual size y 3) If they are not consistent, the first waveguide and the second waveguide that have been bonded should be rotated around an axis parallel to the X direction by an angle of - d ;vice versa.

[0099] Therefore, step S330 may include the following steps: S331: projecting an image beam at the second position to the first waveguide plate and the second waveguide plate at the first position, so that the first light in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, and at the same time, the second light in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, so as to form a fourth image, and monitoring the actual size of the fourth image in real time at the third position, including the actual size in the X direction and the actual size in the Y direction; S332: Rotate the bonded first waveguide plate and the second waveguide plate around an axis parallel to the Y direction by an angle of + i , and rotate around an axis parallel to the X direction by an angle + d ; S333: Determine the actual size of the fourth image in the X direction and the initial actual size of the third image in the X direction x 3 are consistent; if not, the first waveguide plate and the second waveguide plate that have been bonded are rotated by an angle of -2 around an axis parallel to the Y direction i ; S334: Determine the actual size of the fourth image in the Y direction and the initial actual size of the third image in the Y direction y 3 are consistent; if not, the first waveguide plate and the second waveguide plate that have been bonded are rotated by an angle of -2 around an axis parallel to the X direction d .

[0100] Step S331 simulates the imaging process in which the first light in the image beam is transmitted through the first waveguide plate and outputs the first image, and the second light is transmitted through the second waveguide plate and outputs the second image, so as to monitor in real time the actual size of the fourth image, which is formed by superimposing the first image and the second image. The device that projects the image beam to the first waveguide plate and the second waveguide plate at the second position may be an optical machine, and the device that monitors in real time the actual size of the fourth image at the third position may be a camera.

[0101] The rotation angle of the first waveguide plate and the second waveguide plate that have been bonded i satisfy: i =|arccos( x 0 / x 1)-arccos( x 0 / x 3)|, and the angle d satisfy: d =|arccos( y 0 / y 1)-arccos( y 0 / y 3)|. Among them, x 0 represents the theoretical size of the first image, the second image, and the third image in the X direction. y 0 represents the theoretical size of the first image, the second image, and the third image in the Y direction. The theoretical sizes of the first image, the second image, and the third image in the X direction and the Y direction are consistent, which can be calculated based on the size of the virtual image output by the image beam output device such as the optical machine, and the parameters of the acquisition device such as the camera (ignoring the distortion error caused by the acquisition device such as the camera).

[0102] S340: Projecting an image beam at the second position to the first waveguide plate, the second waveguide plate, and the third waveguide plate located at the first position, so that the first light in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, so that the second light in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, and at the same time, the third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating, so as to form a fifth image, and acquiring the initial actual size of the fifth image at the third position, including the initial actual size in the X direction. x 5 and the initial actual size in the Y direction y 5.

[0103] This step simulates the imaging process in which the first light in the image beam is transmitted through the first waveguide plate and outputs the first image, the second light is transmitted through the second waveguide plate and outputs the second image, and the third light is transmitted through the third waveguide plate and outputs the third image, so as to obtain the initial actual size of the fifth image, which is formed by superimposing the first image, the second image and the third image. The device that projects the image beam to the first waveguide plate, the second waveguide plate and the third waveguide plate at the second position may be an optical machine, and the device that obtains the initial actual size of the fifth image at the third position may be a camera.

[0104] S350: Move the first waveguide plate and the second waveguide plate that have been bonded together along the X direction by a distance of ± c , and move along the Y direction by a distance of ± d , so that the actual size of the fifth image is consistent with the actual size of the third image.

[0105] After the positional relationship between the third waveguide sheet and the first and second waveguide sheets that have been bonded is adjusted by rotating the bonded first and second waveguide sheets, the actual sizes of the first, second and fourth images become consistent with the actual size of the third image, but the positions of the first, second and fourth images may not completely overlap with the position of the third image. At this time, by moving the bonded first and second waveguide sheets to adjust the relative positions of the third waveguide sheet and the bonded first and second waveguide sheets, the positions of the first, second and fourth images can be completely overlapped with the position of the third image. The fifth image is formed by superimposing the third image with the first and second images, and the first and second images are superimposed to form the fourth image, so it can also be said that the fifth image is formed by superimposing the third image with the fourth image. After the processing of steps S140 to S160, the first, second and fourth images not only have the same actual sizes but also completely overlap in position. Therefore, when the first, second or fourth image has the same actual size and completely overlaps in position with the third image, the actual size of the fifth image is consistent with the actual size of the third image. In other words, the actual size of the fifth image is consistent with the actual size of the third image, which means that the positions of the first image, the second image, and the fourth image completely overlap with the position of the third image.

[0106] Specifically, the first waveguide plate and the second waveguide plate that have been bonded move a distance + c or- c After that, the actual size of the fifth image in the X direction will be the same as the actual size of the third image in the X direction (initial actual size x 3) Consistent. If the first waveguide and the second waveguide that have been bonded move a distance + c After that, the actual size of the fifth image in the X direction is equal to the actual size of the third image in the X direction (initial actual size x3) If they are not consistent, the first waveguide and the second waveguide that have been bonded should be moved along the X direction by a distance of - c ; and vice versa. The distance that the first waveguide and the second waveguide that have been bonded move c satisfy: c =| x 5- x 1|.

[0107] Similarly, the first waveguide and the second waveguide that have been bonded together move a distance + d or- d After that, the actual size of the fifth image in the Y direction will be the same as the actual size of the third image in the Y direction (initial actual size y 3) Consistent. If the first waveguide and the second waveguide that have been bonded move a distance + d After that, the actual size of the fifth image in the Y direction is equal to the actual size of the third image in the Y direction (initial actual size y 3) If they are not consistent, the first waveguide and the second waveguide that have been bonded should be moved along the Y direction by a distance of - d ; and vice versa. The distance that the first waveguide and the second waveguide that have been bonded move d satisfy: d =| y 5- y 1|.

[0108] Therefore, step S350 may include the following steps: S351: projecting an image beam at the second position to the first waveguide plate, the second waveguide plate and the third waveguide plate at the first position, so that the first light in the image beam is coupled into the first waveguide plate from the first coupling-in grating and finally coupled out of the first waveguide plate from the first coupling-out grating, so that the second light in the image beam is coupled into the second waveguide plate from the second coupling-in grating and finally coupled out of the second waveguide plate from the second coupling-out grating, and at the same time, the third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating and finally coupled out of the third waveguide plate from the third coupling-out grating, so as to form a fifth image, and monitoring the actual size of the fifth image in real time at the third position, including the actual size in the X direction and the actual size in the Y direction; S352: Move the first waveguide plate and the second waveguide plate that have been bonded to each other along the X direction c , and move along the Y direction d ; S353: Determine the actual size of the fifth image in the X direction and the initial actual size of the third image in the X direction x 3 are consistent; if not, the first waveguide plate and the second waveguide plate that have been bonded are moved along the X direction by a distance of -2 c ; S354: Determine the actual size of the fifth image in the Y direction and the initial actual size of the third image in the Y direction y 3 are consistent; if not, the first waveguide and the second waveguide that have been bonded are moved along the Y direction by a distance of -2 d .

[0109] Step S351 simulates the imaging process in which the first light in the image beam is transmitted through the first waveguide plate and outputs the first image, the second light is transmitted through the second waveguide plate and outputs the second image, and the third light is transmitted through the third waveguide plate and outputs the third image, so as to monitor the actual size of the fifth image in real time, and the fifth image is formed by superimposing the third image with the first image and the second image. The device that projects the image beam to the first waveguide plate, the second waveguide plate and the third waveguide plate at the second position may be an optical machine, and the device that monitors the actual size of the fifth image in real time at the third position may be a camera.

[0110] S360: injecting glue between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet to make the first waveguide sheet, the second waveguide sheet and the third waveguide sheet fit together.

[0111] After the processing of steps S110 to S170 and steps S310 to S350, the third image formed by the image light beam transmitted through the third waveguide plate, the first image formed by the image light beam transmitted through the first waveguide plate, and the second image formed by the image light beam transmitted through the second waveguide plate can be accurately overlapped. As long as the relative positions of the third waveguide plate and the first waveguide plate and the second waveguide plate are fixed at this time, a full-color optical waveguide with accurately overlapping fields of view can be obtained.

[0112] After the glue is injected between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet, the glue injected between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet can be cured by natural curing, heat curing, light curing, etc. After the glue injected between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet is cured, the relative position of the third waveguide sheet and the first waveguide sheet and the second waveguide sheet is fixed, thereby achieving the bonding of the third waveguide sheet with the first waveguide sheet and the second waveguide sheet.

[0113] In the above steps S210 to S260, the execution order of steps S310 and S320 can be swapped, as long as they are completed before executing steps S230 to S260.

[0114] Figure 6 The lamination device for making full-color optical waveguides is shown. Figure 3~Figure 5 The method shown in the figure realizes the bonding of the waveguide sheets in the full-color optical waveguide. Figure 6 As shown, the device includes an optical machine 100 , a camera 300 and a fixture 400 .

[0115] The optical machine 100 is used as an image output mechanism, and is used to project an image beam with a virtual image to the waveguide plate at the first position at the second position, so that at least part of the light in the image beam is coupled into the grating into the waveguide plate, and finally coupled out of the grating out of the waveguide plate, forming a corresponding image at the third position. The optical machine 100 can adopt an optical machine 100 commonly used in display products, specifically, a DLP (Digital Light Processing) optical machine module, an LCOS (Liquid Crystal on Silicon) optical machine module, an LBS (Laser Beam Scanning) optical machine module, an OLED (Organic Light-Emitting Diode) display module, etc.

[0116] use Figure 3 When the method shown realizes the bonding of the first waveguide sheet and the second waveguide sheet in the full-color optical waveguide, the optical machine 100 is used to project the image beam at the second position to the first waveguide sheet, the second waveguide sheet, or the first waveguide sheet and the second waveguide sheet located at the first position. Specifically, the optical machine 100 is used to project the image beam at the second position to the first waveguide sheet located at the first position in step S110, to project the image beam at the second position to the second waveguide sheet located at the first position in steps S120 and S141, and to project the image beam at the second position to the first waveguide sheet and the second waveguide sheet located at the first position in steps S150 and S161.

[0117] use Figure 4~Figure 5 When the method shown realizes the bonding of the third waveguide sheet with the other two waveguide sheets in the full-color optical waveguide, the optical machine 100 is also used to project an image beam from the second position to the third waveguide sheet located at the first position, or to the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet. Specifically, the optical machine 100 is used to project an image beam from the second position to the third waveguide sheet located at the first position in steps S210, S231, and S310, and is used to project an image beam from the second position to the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet located at the first position in steps S240, S251, S340, and S351, and is used to project an image beam from the second position to the first waveguide sheet and the second waveguide sheet located at the first position in step S331.

[0118] The camera 300 serves as an image acquisition mechanism, and is used to acquire at a third position or even monitor in real time the image transmitted and outputted by the waveguide plate at the first position and its actual size (including the initial actual size), so as to calculate the rotation angle and movement distance of the adjusted waveguide plate, thereby quickly completing the pairing and bonding of each waveguide plate in the full-color optical waveguide.

[0119] use Figure 3When the method shown realizes the bonding of the first waveguide sheet and the second waveguide sheet in the full-color optical waveguide, the camera 300 is used to obtain the initial actual size of the first image, the second image or the fourth image at the third position, and even to monitor the actual size of the second image or the fourth image in real time at the third position. Specifically, the camera 300 is used to obtain the initial actual size of the first image at the third position in step S110, to obtain the initial actual size of the second image at the third position in step S120, to obtain the initial actual size of the first image and the second image at the third position in step S150, to monitor the actual size of the second image at the third position in real time in step S141, and to monitor the actual size of the fourth image at the third position in real time in step S161.

[0120] use Figure 4~Figure 5 When the method shown realizes the bonding of the third waveguide sheet with the other two waveguide sheets in the full-color optical waveguide, the camera 300 is also used to obtain the initial actual size of the third image or the fifth image at the third position, and even to monitor the actual size of the third image or the fifth image in real time at the third position. Specifically, the camera 300 is used to obtain the initial actual size of the third image at the third position in steps S210 and S310, to obtain the initial actual size of the fifth image at the third position in steps S240 and S340, to monitor the actual size of the third image at the third position in real time in step S231, to monitor the actual size of the fifth image at the third position in real time in steps S251 and S351, and to monitor the actual size of the fourth image at the third position in real time in step S331.

[0121] The fixture 400 serves as an auxiliary control mechanism, which is used to load the waveguide plate so that the waveguide plate is positioned at the first position, and is also used to rotate and move a part of the waveguide plate so that the image transmitted and output through this part of the waveguide plate is completely overlapped with the image transmitted and output through another part of the waveguide plate, thereby making the fields of view of each part of the waveguide plate in the full-color optical waveguide accurately overlap.

[0122] use Figure 3 When the method shown realizes the bonding of the first waveguide sheet and the second waveguide sheet in the full-color optical waveguide, the fixture 400 is used to load and position the first waveguide sheet, the second waveguide sheet, or the first waveguide sheet and the second waveguide sheet to the first position, and is also used to rotate or move the second waveguide sheet. Specifically, the fixture 400 is used to load and position the first waveguide sheet to the first position in step S110, to load and position the second waveguide sheet to the first position in step S120, to load and position the first waveguide sheet and the second waveguide sheet to the first position in steps S130 to S170, to rotate the second waveguide sheet in step S140, and to move the second waveguide sheet in step S160.

[0123] use Figure 4~Figure 5When the method shown realizes the bonding of the third waveguide sheet with the other two waveguide sheets in the full-color optical waveguide, the fixture 400 is also used to: load and position the third waveguide sheet, or the first waveguide sheet, the second waveguide sheet and the third waveguide sheet to the first position; rotate or move the third waveguide sheet or the bonded first waveguide sheet and the second waveguide sheet. Specifically, the fixture 400 is used to load and position the third waveguide sheet to the first position in steps S210 and S310, to load and position the first waveguide sheet, the second waveguide sheet and the third waveguide sheet to the first position in steps S220 to S260 and steps S320 to S360, to rotate the third waveguide sheet in step S230, to move the third waveguide sheet in step S250, to rotate the bonded first waveguide sheet and the second waveguide sheet in step S330, and to move the bonded first waveguide sheet and the second waveguide sheet in step S350.

[0124] The fixture 400 may include a first fixture 410 and a second fixture 420. The first fixture 410 is used to load and position the first waveguide sheet, the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded together. The second fixture 420 is used to load and position and rotate or move the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded together. Specifically, in steps S110 to S170, the first waveguide sheet may be loaded by the first fixture 410 to be positioned at the first position, the second waveguide sheet may be loaded by the second fixture 420 to be positioned at the first position, and may also be rotated or moved under the action of the second fixture 420. In steps S210 to S260, the third waveguide sheet may be loaded by the first fixture 410 to be positioned at the first position, the first waveguide sheet and the second waveguide sheet that have been bonded together may be loaded by the second fixture 420 to be positioned at the first position, and may also be rotated or moved under the action of the second fixture 420. In steps S310 to S360, the bonded first waveguide sheet and the second waveguide sheet can be loaded by the first jig 410 to be positioned at the first position, and the third waveguide sheet can be loaded by the second jig 420 to be positioned at the first position, and can also be rotated or moved under the action of the second jig 420. In addition, in step S110, the first waveguide sheet can also be loaded by the second jig 420 to be positioned at the first position; in step S120, the second waveguide sheet can also be loaded by the first jig 410 to be positioned at the first position; in step S210, the third waveguide sheet can also be loaded by the second jig 420 to be positioned at the first position; in step S310, the third waveguide sheet can also be loaded by the first jig 410 to be positioned at the first position.

[0125] The first fixture 410 may also have a grabbing and moving function, so as to grab and move the first waveguide sheet, the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first position, so as to achieve the purpose of loading and positioning the first waveguide sheet, the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first position. Similarly, the second fixture 420 may also have a grabbing and moving function, so as to grab and move the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first position, so as to achieve the purpose of loading and positioning the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first position.

[0126] For the first jig 410 without the grabbing and moving functions, the device may be further equipped with a first grabbing mechanism (not shown) to grab and move the first waveguide sheet, the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first jig 410. Similarly, for the second jig 420 without the grabbing and moving functions, the device may be further equipped with a second grabbing mechanism (not shown) to grab and move the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the second jig 420.

[0127] The device may also be equipped with a glue dispenser (not shown) for injecting glue between the first waveguide sheet and the second waveguide sheet, between the third waveguide sheet and the first waveguide sheet, or between the third waveguide sheet and the second waveguide sheet. Specifically, the glue dispenser is used to inject glue between the first waveguide sheet and the second waveguide sheet in step S170, and is used to inject glue between the third waveguide sheet and the first waveguide sheet, or between the third waveguide sheet and the second waveguide sheet in steps S260 and S360. The glue dispenser may have a curing function, which may be heat curing or light curing, so as to cure the glue between the first waveguide sheet and the second waveguide sheet, between the third waveguide sheet and the first waveguide sheet, or between the third waveguide sheet and the second waveguide sheet.

[0128] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A bonding method for manufacturing a full-color optical waveguide, wherein the full-color optical waveguide comprises a first waveguide plate for transmitting a first light and a second waveguide plate for transmitting a second light, wherein the wavelength ranges of the first light and the second light are different, wherein the first waveguide plate is provided with at least a first coupling-in grating for coupling in the first light and a first coupling-out grating for coupling out the first light, and the second waveguide plate is provided with at least a second coupling-in grating for coupling in the second light and a second coupling-out grating for coupling out the second light, wherein: The method comprises the following steps: At the second position, an image beam is projected onto the first waveguide plate at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating to form a first image, and an initial actual size of the first image is acquired at the third position, including the initial actual size in the X direction. x 1 and the initial actual size in the Y direction y 1; Projecting an image beam at a second position toward a second waveguide plate at a first position, coupling a second light ray in the image beam into the second waveguide plate from a second coupling-in grating, and finally coupling out of the second waveguide plate from a second coupling-out grating to form a second image, and acquiring an initial actual size of the second image at a third position, including an initial actual size in the X direction x 2 and the initial actual size in the Y direction y 2; pre-bonding the first waveguide sheet and the second waveguide sheet; Let the second waveguide rotate around the axis parallel to the Y direction by an angle ± α , and rotate around an axis parallel to the X direction by an angle ± β , so that the actual size of the second image is consistent with the actual size of the first image; Projecting an image beam at the second position toward the first waveguide plate and the second waveguide plate at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, and simultaneously a second light ray in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, to form a fourth image, and acquiring an initial actual size of the fourth image at the third position, including an initial actual size in the X direction x 4 and the initial actual size in the Y direction y 4; Move the second waveguide plate along the X direction by a distance of ± a , and move along the Y direction by a distance of ± b , so that the actual size of the fourth image is consistent with the actual size of the first image; Injecting glue between the first waveguide sheet and the second waveguide sheet to make the first waveguide sheet fit the second waveguide sheet; The relative positions of the first position, the second position and the third position remain consistent during the bonding process, the X direction and the Y direction are perpendicular to each other, and the pre-bonding refers to making the two pre-bonded objects close to each other and set at a distance; the angle α satisfy: α =|arccos( x 0 / x 1)-arccos( x 0 / x 2)|, where x 0 is the theoretical size of the first image and the second image in the X direction; the angle β satisfy: β =|arccos( y 0 / y 1)-arccos( y 0 / y 2)|, where y 0 is the theoretical size of the first image and the second image in the Y direction; the distance a satisfy: a =| x 4- x 1|; the distance b satisfy: b =| y 4- y 1|.

2. The bonding method for making a full-color optical waveguide according to claim 1, characterized in that: The second waveguide is rotated around an axis parallel to the Y direction by an angle ± α , and rotate around an axis parallel to the X direction by an angle ± β , the step of making the actual size of the second image consistent with the actual size of the first image comprises: Projecting an image beam at a second position to a second waveguide plate at a first position, so that a second light in the image beam is coupled into the second waveguide plate from a second coupling-in grating, and finally coupled out of the second waveguide plate from a second coupling-out grating to form a second image, and monitoring an actual size of the second image in real time at a third position, including an actual size in an X direction and an actual size in a Y direction; The second waveguide is rotated around an axis parallel to the Y direction by an angle α , and rotates around an axis parallel to the X direction by an angle β ; Determine whether the actual size of the second image in the X direction is the same as the initial actual size of the first image in the X direction x 1; if not, the second waveguide is rotated around an axis parallel to the Y direction by an angle of -2 α ; Determine whether the actual size of the second image in the Y direction is the same as the initial actual size of the first image in the Y direction y 1; if not, the second waveguide is rotated around an axis parallel to the X direction by an angle of -2 β .

3. The bonding method for making a full-color optical waveguide according to claim 1, characterized in that: The second waveguide is moved along the X direction by a distance of ± a , and move along the Y direction by a distance of ± b The step of making the actual size of the fourth image consistent with the actual size of the first image includes: Projecting an image beam at the second position to the first waveguide plate and the second waveguide plate at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, and simultaneously a second light ray in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, to form a fourth image, and monitoring the actual size of the fourth image in real time at the third position, including the actual size in the X direction and the actual size in the Y direction; Move the second waveguide in the X direction by a distance a , and move along the Y direction b ; Determine whether the actual size of the fourth image in the X direction is the same as the initial actual size of the first image in the X direction x 1; if not, move the second waveguide along the X direction by a distance of -2 a ; Determine whether the actual size of the fourth image in the Y direction is the same as the initial actual size of the first image in the Y direction y 1; if not, move the second waveguide along the Y direction by a distance of -2 b .

4. The bonding method for making a full-color optical waveguide according to any one of claims 1 to 3, characterized in that: The full-color optical waveguide further comprises a third waveguide plate for transmitting a third light, the third light having a wavelength range different from that of the first light and the second light, and the third waveguide plate is provided with at least a third coupling-in grating for coupling-in the third light and a third coupling-out grating for coupling-out the third light; the method further comprises the following steps: Projecting an image beam at the second position to the third waveguide plate at the first position, so that a third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating to form a third image, and obtaining an initial actual size of the third image at the third position, including an initial actual size in the X direction x 3 and the initial actual size in the Y direction y 3; pre-bonding the third waveguide sheet to the first waveguide sheet and the second waveguide sheet; Let the third waveguide rotate around the axis parallel to the Y direction by an angle ± θ , and rotate around an axis parallel to the X direction by an angle ± δ , making the actual size of the third image consistent with the actual size of the first image, the second image or the fourth image; At the second position, an image beam is projected onto the first waveguide plate, the second waveguide plate, and the third waveguide plate located at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, so that a second light ray in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, and at the same time, a third light ray in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating, so as to form a fifth image, and an initial actual size of the fifth image is acquired at the third position, including an initial actual size in the X direction. x 5 and the initial actual size in the Y direction y 5; Move the third waveguide plate along the X direction by a distance of ± c , and move along the Y direction by a distance of ± d , making the actual size of the fifth image consistent with the actual size of the first image, the second image or the fourth image; Injecting glue between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet to make the first waveguide sheet fit the second waveguide sheet / the third waveguide sheet; Among them, the angle θ satisfy: θ =|arccos( x 0 / x 1)-arccos( x 0 / x 3)|, where x 0 is the theoretical size of the first image, the second image, and the third image in the X direction; the angle δ satisfy: δ =|arccos( y 0 / y 1)-arccos( y 0 / y 3)|, where y 0 is the theoretical size of the first image, the second image, and the third image in the Y direction; the distance c satisfy: c =| x 5- x 1|; the distance d satisfy: d =| y 5- y 1|.

5. The bonding method for making a full-color optical waveguide according to any one of claims 1 to 3, characterized in that: The full-color optical waveguide further comprises a third waveguide plate for transmitting a third light, the third light having a wavelength range different from that of the first light and the second light, and the third waveguide plate is provided with at least a third coupling-in grating for coupling-in the third light and a third coupling-out grating for coupling-out the third light; the method further comprises the following steps: Projecting an image beam at the second position to the third waveguide plate at the first position, so that a third light in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating to form a third image, and obtaining an initial actual size of the third image at the third position, including an initial actual size in the X direction x 3 and the initial actual size in the Y direction y 3; Pre-bonding the third waveguide sheet to the bonded first waveguide sheet and the second waveguide sheet; The first waveguide plate and the second waveguide plate that have been bonded are rotated by an angle ± about an axis parallel to the Y direction. θ , and rotate around an axis parallel to the X direction by an angle ± δ , making the actual size of the first image, the second image or the fourth image consistent with the actual size of the third image; At the second position, an image beam is projected onto the first waveguide plate, the second waveguide plate, and the third waveguide plate located at the first position, so that a first light ray in the image beam is coupled into the first waveguide plate from the first coupling-in grating, and finally coupled out of the first waveguide plate from the first coupling-out grating, so that a second light ray in the image beam is coupled into the second waveguide plate from the second coupling-in grating, and finally coupled out of the second waveguide plate from the second coupling-out grating, and at the same time, a third light ray in the image beam is coupled into the third waveguide plate from the third coupling-in grating, and finally coupled out of the third waveguide plate from the third coupling-out grating, so as to form a fifth image, and an initial actual size of the fifth image is acquired at the third position, including an initial actual size in the X direction. x 5 and the initial actual size in the Y direction y 5; Move the first waveguide and the second waveguide that have been bonded together along the X direction by a distance of ± c , and move along the Y direction by a distance of ± d , so that the actual size of the fifth image is consistent with the actual size of the third image; Injecting glue between the third waveguide sheet and the first waveguide sheet / the second waveguide sheet to make the first waveguide sheet, the second waveguide sheet and the third waveguide sheet fit together; Among them, the angle θ satisfy: θ =|arccos( x 0 / x 1)-arccos( x 0 / x 3)|, where x 0 is the theoretical size of the first image, the second image, and the third image in the X direction; the angle δ satisfy: δ =|arccos( y 0 / y 1)-arccos( y 0 / y 3)|, where y 0 is the theoretical size of the first image, the second image, and the third image in the Y direction; the distance c satisfy: c =| x 5- x 1|; the distance d satisfy: d =| y 5- y 1|.

6. A bonding device for making a full-color optical waveguide, characterized in that: The device includes a jig, an optical machine and a camera, and is applied to the bonding method for producing a full-color optical waveguide as described in any one of claims 1 to 3; the jig is used to load and position the first waveguide sheet and / or the second waveguide sheet to the first position, and is also used to rotate or move the second waveguide sheet; the optical machine is used to project an image beam at the second position to the first waveguide sheet and / or the second waveguide sheet located at the first position; and the camera is used to obtain the initial actual size of the first image, the second image or the fourth image at the third position.

7. The bonding device for making a full-color optical waveguide according to claim 6, characterized in that: The device applies the bonding method for producing a full-color optical waveguide as described in any one of claims 4 to 5; the fixture is also used to load and position the third waveguide sheet, or the first waveguide sheet, the second waveguide sheet and the third waveguide sheet to the first position, and is also used to rotate or move the third waveguide sheet or the bonded first waveguide sheet and the second waveguide sheet; the optical machine is also used to project an image beam at the second position to the third waveguide sheet, or the first waveguide sheet, the second waveguide sheet and the third waveguide sheet located at the first position; the camera is also used to obtain the initial actual size of the third image or the fifth image at the third position.

8. The bonding device for making a full-color optical waveguide according to claim 7, characterized in that: The jig includes a first jig and a second jig, wherein the first jig is used to load and position the first waveguide sheet, the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded together, and the second jig is used to load and rotate and move the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded together; The camera is also used to monitor the actual size of the first image, the second image, the third image, the fourth image or the fifth image in real time.

9. The bonding device for making a full-color optical waveguide according to claim 8, characterized in that: The first fixture is further used to grab and move the first waveguide sheet, the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first position; or the device further includes a first grabbing mechanism, and the first grabbing mechanism is used to grab and move the first waveguide sheet, the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first fixture; The second fixture is also used to grab and move the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the first position; or the device also includes a second grabbing mechanism, and the second grabbing mechanism is used to grab and move the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded to the second fixture.

10. The bonding device for making a full-color optical waveguide according to claim 7, characterized in that: The device also includes a glue dispenser, which is used for injecting glue between the first waveguide sheet and the second waveguide sheet, between the third waveguide sheet and the first waveguide sheet, or between the third waveguide sheet and the second waveguide sheet.

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