Laminating Method and Laminating Apparatus for Manufacturing Full-Color Optical Waveguides

Abstract

This solution belongs to the field of full-color optical waveguide technology, and discloses a fitting method and a fitting device for manufacturing a full-color optical waveguide. By simulating the light transmission process of each waveguide sheet in a display product and obtaining the output image, and then calculating the optimal parameters (including the rotation angle and the moving distance of some waveguide sheets) required when two parts (each part includes at least one waveguide sheet) of waveguide sheets are fitted and the fields of view are completely coincident according to the actual size of the obtained image. Finally, the relative positions of the two parts of waveguide sheets are adjusted and fixed according to the calculated optimal parameters. Therefore, the pairing and fitting of each waveguide sheet in the full-color optical waveguide can be quickly completed, which not only improves the production efficiency but also reduces the production cost. Moreover, the fields of view of the waveguide sheets of the obtained full-color optical waveguide can be accurately coincident, effectively avoiding the ghosting phenomenon.

Description

Technical Field

[0001] This solution 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), virtual reality (VR), etc., full-color optical waveguide technology plays a crucial role in achieving high-resolution, high-brightness, and high-color-saturation display effects. However, despite the broad prospects of this technology, in the actual application and manufacturing process, especially in the bonding link of full-color optical waveguides, there are many pain points. These problems not only affect the display effect of the product but also significantly increase the production cost and reduce the production efficiency.

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

[0004] To address this challenge, a possible solution is to use two or three waveguide sheets bonded together to form a full-color optical waveguide. In this design, usually, a waveguide sheet is used to separately transmit and couple out green light, while red light and blue light are transmitted and coupled out through another or two waveguide sheets. This design can effectively reduce the mutual interference between light rays, 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, due to the limitation of processing accuracy, the field of view (FOV) of a single waveguide sheet often has a certain error from the optical design value. When these waveguide sheets are paired and bonded to form a full-color optical waveguide, the FOV errors of each of them will cause the FOV of the full-color optical waveguide to not coincide precisely. This non-coincidence of the FOV is manifested as an obvious ghosting phenomenon in the image test, that is, the observer will see multiple overlapping images, which seriously affects the visual experience.

[0006] In addition to affecting the display effect, the non - overlapping of the FOV also brings the problem of low production efficiency. Since it is necessary to ensure that the FOVs of the full - color optical waveguides can be accurately overlapped, a large number of tests and pairing operations are required during the production process. These operations 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 multiple attempts and adjustments to find the waveguide combination with overlapping FOVs. This not only increases the production cost but also significantly extends the production cycle and reduces the production efficiency. Summary of the Invention

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

[0008] To solve the above - mentioned technical problems, the following technical solutions are adopted:

[0009] In the first aspect, a bonding method for manufacturing a full - color optical waveguide is proposed. If the full - color optical waveguide includes a first waveguide sheet for transmitting a first light ray and a second waveguide sheet for transmitting a second light ray, the wavelength ranges of the first light ray and the second light ray are different, the first waveguide sheet is at least provided with a first coupling grating for coupling the first light ray in and a first coupling - out grating for coupling the first light ray out, and the second waveguide sheet is at least provided with a second coupling grating for coupling the second light ray in and a second coupling - out grating for coupling the second light ray out; then the method includes the following steps:

[0010] Project an image beam onto the first waveguide sheet located at the first position at the second position, so that the first light ray in the image beam is coupled into the first waveguide sheet from the first coupling grating and finally coupled out of the first waveguide sheet from the first coupling - out grating to form a first image, and obtain the 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 ;

[0011] Project an image beam onto the second waveguide sheet located at the first position at the second position, so that the second light ray in the image beam is coupled into the second waveguide sheet from the second coupling grating and finally coupled out of the second waveguide sheet from the second coupling - out grating to form a second image, and obtain the initial actual size of the second image at the third position, including the initial actual size in the X direction x 2 and the initial actual size in the Y direction y 2 ;

[0012] Pre - bond the first waveguide sheet and the second waveguide sheet;

[0013] Rotate the second waveguide plate by an angle of ± about an axis parallel to the Y direction α and by an angle of ± about an axis parallel to the X direction β so that the actual size of the second image is the same as the actual size of the first image;

[0014] Project an image beam onto the first waveguide plate and the second waveguide plate at the first position. Make the first light ray in the image beam couple into the first waveguide plate from the first coupling grating and finally couple out of the first waveguide plate from the first output grating. At the same time, make the second light ray in the image beam couple into the second waveguide plate from the second coupling grating and finally couple out of the second waveguide plate from the second output grating to form a fourth image. Obtain 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 ;

[0015] Move the second waveguide plate in the X direction by a distance of ± a and in the Y direction by a distance of ± b so that the actual size of the fourth image is the same as the actual size of the first image;

[0016] Inject glue between the first waveguide plate and the second waveguide plate to make the first waveguide plate and the second waveguide plate fit together;

[0017] Among them, the relative positions of the first position, the second position and the third position always remain the same during the fitting process. The X direction and the Y direction are perpendicular to each other. Pre-fitting means making the two to be pre-fitted approach each other and be separated by a set distance; the angle α satisfies: 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 satisfies: β =|arccos( y 0 / y 1 ) - arccos( y 0 / y 2 )|, where y 0is the theoretical size of the first image and the second image in the Y direction; the distance a satisfies: a = | x 4 - x 1 |; the distance b satisfies: b = | y 4 - y 1 |.

[0018] Preferably, the step of rotating the second waveguide plate by an angle of ± α about an axis parallel to the Y direction and by an angle of ± β about an axis parallel to the X direction to make the actual size of the second image consistent with the actual size of the first image includes:

[0019] Projecting an image beam onto the second waveguide plate located at the first position at the second position, so that the second light ray in the image beam is coupled into the second waveguide plate from the second coupling grating and finally coupled out of the second waveguide plate from the second output 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;

[0020] Rotating the second waveguide plate by an angle of α about an axis parallel to the Y direction and by an angle of β about an axis parallel to the X direction;

[0021] Judging whether the actual size of the second image in the X direction is consistent with the initial actual size x 1 of the first image in the X direction; if not, rotating the second waveguide plate by an angle of -2 α about an axis parallel to the Y direction;

[0022] Judging whether the actual size of the second image in the Y direction is consistent with the initial actual size y 1 of the first image in the Y direction; if not, rotating the second waveguide plate by an angle of -2 β about an axis parallel to the X direction.

[0023] Preferably, the step of moving the second waveguide plate by a distance of ± a in the X direction and by a distance of ± b in the Y direction to make the actual size of the fourth image consistent with the actual size of the first image includes:

[0024] Project an image beam onto a first waveguide sheet and a second waveguide sheet located at a first position at a second position, such that a first light ray in the image beam is coupled into the first waveguide sheet from a first coupling grating and finally coupled out of the first waveguide sheet from a first output grating, while a second light ray in the image beam is coupled into the second waveguide sheet from a second coupling grating and finally coupled out of the second waveguide sheet from a second output grating, to form a fourth image, and monitor the actual size of the fourth image in real time at a third position, including the actual size in the X direction and the actual size in the Y direction;

[0025] Let the second waveguide sheet move a distance a in the X direction and move a distance b in the Y direction;

[0026] 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, let the second waveguide sheet move a distance of -2 in the X direction a ;

[0027] 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, let the second waveguide sheet move a distance of -2 in the Y direction b .

[0028] If the full-color optical waveguide further includes a third waveguide sheet for transmitting a third light ray, the wavelength range of the third light ray is different from those of the first light ray and the second light ray, and the third waveguide sheet is at least provided with a third coupling grating for coupling in the third light ray and a third output grating for coupling out the third light ray; then the method further includes the following steps:

[0029] Project an image beam onto the third waveguide sheet located at the first position at the second position, such that the third light ray in the image beam is coupled into the third waveguide sheet from the third coupling grating and finally coupled out of the third waveguide sheet from the third output grating, to form a third image, and obtain the 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 ;

[0030] Pre-bond the third waveguide sheet to the first waveguide sheet and the second waveguide sheet;

[0031] Let the third waveguide sheet rotate an angle of ± θ about an axis parallel to the Y direction and rotate an angle of ± δ about an axis parallel to the X direction, so that the actual size of the third image is the same as the actual size of the first image, the second image or the fourth image;

[0032] Project an image beam at a second position onto a first waveguide sheet, a second waveguide sheet, and a third waveguide sheet located at a first position, such that a first light ray in the image beam is coupled into the first waveguide sheet through a first coupling grating and finally coupled out of the first waveguide sheet through a first coupling-out grating, a second light ray in the image beam is coupled into the second waveguide sheet through a second coupling grating and finally coupled out of the second waveguide sheet through a second coupling-out grating, and at the same time a third light ray in the image beam is coupled into the third waveguide sheet through a third coupling grating and finally coupled out of the third waveguide sheet through a third coupling-out grating, to form a fifth image, and obtain an initial actual size of the fifth image at a third position, including an initial actual size in the X direction x 5 and an initial actual size in the Y direction y 5 ;

[0033] Let the third waveguide sheet move a distance of ± c in the X direction and a distance of ± d in the Y direction, so that the actual size of the fifth image is the same as the actual size of the first image, the second image, or the fourth image;

[0034] Inject glue between the third waveguide sheet and the first waveguide sheet / second waveguide sheet to make the first waveguide sheet fit with the second waveguide sheet / third waveguide sheet;

[0035] where the angle θ satisfies: 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 satisfies: 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 satisfies: c =| x 5 -x 1 |; Distance d Satisfy: d =| y 5 - y 1 |.

[0036] Alternatively, the method further includes the following steps:

[0037] Project an image beam at a second position onto a third waveguide sheet located at a first position, so that a third light ray in the image beam is coupled into the third waveguide sheet through a third coupling grating and finally coupled out of the third waveguide sheet through a third output grating to form a third image, and obtain an initial actual size of the third image at a third position, including an initial actual size in the X direction x 3 and an initial actual size in the Y direction y 3 ;

[0038] Pre - fit the third waveguide sheet with the already - bonded first waveguide sheet and second waveguide sheet;

[0039] Let the already - bonded first waveguide sheet and second waveguide sheet rotate by an angle of ± θ about an axis parallel to the Y direction and rotate by an angle of ± δ about an axis parallel to the X direction, so that the actual size of the first image, the second image or the fourth image is the same as the actual size of the third image;

[0040] Project an image beam at a second position onto the first waveguide sheet, the second waveguide sheet and the third waveguide sheet located at a first position, so that a first light ray in the image beam is coupled into the first waveguide sheet through a first coupling grating and finally coupled out of the first waveguide sheet through a first output grating, a second light ray in the image beam is coupled into the second waveguide sheet through a second coupling grating and finally coupled out of the second waveguide sheet through a second output grating, and at the same time a third light ray in the image beam is coupled into the third waveguide sheet through a third coupling grating and finally coupled out of the third waveguide sheet through a third output grating to form a fifth image, and obtain an initial actual size of the fifth image at a third position, including an initial actual size in the X direction x 5 and an initial actual size in the Y direction y 5 ;

[0041] Let the already - bonded first waveguide sheet and second waveguide sheet move a distance of ± c in the X direction and move a distance of ± d in the Y direction, so that the actual size of the fifth image is the same as the actual size of the third image;

[0042] Inject 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;

[0043] Among them, the angle θ satisfies: 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 satisfies: 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 satisfies: c = | x 5 - x 1 |; the distance d satisfies: d = | y 5 - y 1 |.

[0044] In a second aspect, a fitting device for manufacturing a full-color optical waveguide is proposed. The device includes a jig, an optical machine, and a camera, and applies the above fitting method.

[0045] If the full-color optical waveguide includes a first waveguide sheet for transmitting a first light ray and a second waveguide sheet for transmitting a second light ray, where the wavelength ranges of the first light ray and the second light ray are different, the first waveguide sheet is at least provided with a first coupling 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 sheet is at least provided with a second coupling grating for coupling in the second light ray and a second coupling-out grating for coupling out the second light ray; then the jig is used to load and position the first waveguide sheet and / or the second waveguide sheet to a first position, and is also used to rotate or move the second waveguide sheet; the optical engine is used to project an image beam to the first waveguide sheet and / or the second waveguide sheet located at the first position at a second position; the camera is used to obtain the initial actual sizes of the first image, the second image or the fourth image at a third position.

[0046] If the full-color optical waveguide further includes a third waveguide sheet for transmitting a third light ray, where the wavelength range of the third light ray is different from those of the first light ray and the second light ray, the third waveguide sheet is at least provided with a third coupling grating for coupling in the third light ray and a third coupling-out grating for coupling out the third light ray; then the jig is further 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 first waveguide sheet and the second waveguide sheet that have been bonded; the optical engine is further used to project an image beam to the third waveguide sheet located at the first position, or the first waveguide sheet, the second waveguide sheet and the third waveguide sheet at the second position; the camera is further used to obtain the initial actual sizes of the third image or the fifth image at the third position.

[0047] 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. The second jig is used to load 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.

[0048] Preferably, the first jig is further used to grasp 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 grasping mechanism, and the first grasping mechanism is used to grasp 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 onto the first jig.

[0049] Preferably, the second jig is further used to grasp 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 further includes a second grasping mechanism, and the second grasping mechanism is used to grasp and move the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded onto the second jig.

[0050] Preferably, the camera is further used to monitor the actual sizes of the first image, the second image, the third image, the fourth image or the fifth image in real time.

[0051] Preferably, the apparatus further includes a 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.

[0052] Compared with the prior art, the present solution has the following beneficial effects: By simulating the light transmission process of each waveguide sheet in the display product and obtaining the output image, and then calculating the optimal parameters (including the rotation angle and moving distance of some waveguide sheets) required when two parts (each part includes at least one waveguide sheet) of waveguide sheets are bonded and the fields of view are completely coincident 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, it is possible to quickly complete the pairing and bonding of each waveguide sheet in the full-color optical waveguide, which not only improves the production efficiency but also reduces the production cost. Moreover, the fields of view of the waveguide sheets of the obtained full-color optical waveguide can be accurately coincident, effectively avoiding the ghosting phenomenon. Description of the Drawings

[0053] The drawings are only for illustrative purposes and should not be construed as a limitation to the present solution; for better illustration of the present solution, some components in the drawings will be omitted, enlarged or reduced, which do not represent the actual size of the product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0054] Figure 1 are the structural and optical path schematic diagrams of a two-piece full-color optical waveguide.

[0055] Figure 2 are the structural and optical path schematic diagrams of a three-piece full-color optical waveguide.

[0056] Figure 3 is the flowchart of the bonding method for manufacturing a two-piece full-color optical waveguide.

[0057] Figure 4 is the flowchart of the bonding method for manufacturing a three-piece full-color optical waveguide.

[0058] Figure 5 is the flowchart of another bonding method for manufacturing a three-piece full-color optical waveguide.

[0059] Figure 6 is the structural schematic diagram of the bonding apparatus for manufacturing a full-color optical waveguide.

[0060] Description of reference numerals: optical engine 100, full-color optical waveguide 200, first waveguide sheet 210, first coupling grating 211, first output coupling grating 212, second waveguide sheet 220, second coupling grating 221, second output coupling grating 222, third waveguide sheet 230, third coupling grating 231, third output coupling grating 232, camera 300, fixture 400, first fixture 410, second fixture 420. Detailed implementation

[0061] To enable those skilled in the art to better understand this solution, the following further elaborates on this solution in combination with specific embodiments.

[0062] Figures 1 - 2 Schematically shows a possible full-color optical waveguide and corresponding display product. The display product is configured with an optical engine 100 and a full-color optical waveguide 200. The optical engine 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 outputs the color image beam from the optical engine 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).

[0063] The full-color optical waveguide 200 transmits light in different wavelength ranges through different waveguide sheets, so that light in the same wavelength range can only be output-coupled by the same grating, effectively avoiding crosstalk. As Figure 1 shown, the full-color optical waveguide 200 may include a first waveguide sheet 210 and a second waveguide sheet 220. The first waveguide sheet 210 is used to transmit first light, and the second waveguide sheet 220 is used to transmit second light. As Figure 2 shown, the full-color optical waveguide 200 may further include a third waveguide sheet 230, and the third waveguide sheet 230 is used to transmit third light. The differences between the first light, the second light, and the third light are that their wavelength ranges are different. For example, if the full-color optical waveguide 200 consists of the first waveguide sheet 210 and the second waveguide sheet 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 consists of the first waveguide sheet 210, the second waveguide sheet 220, and the third waveguide sheet 230, the first light may be red light, the second light may be green light, and the third light may be blue light.

[0064] The first waveguide sheet 210, the second waveguide sheet 220, and the third waveguide sheet 230 may be collectively referred to as waveguide sheets and are used to realize the back-and-forth reflection propagation of light. The waveguide sheet usually has a total reflection critical angle θ c , and the absolute value of the incident angle exceeds the total reflection critical angle θ cWhen the light rays irradiate the surface of the waveguide sheet in the waveguide sheet, they can be completely reflected back by the surface of the waveguide sheet, and thus propagate along the extending direction of the waveguide sheet in the form of back-and-forth reflection in the waveguide sheet. The first waveguide sheet 210 is provided with a first coupling grating 211 and a first output grating 212, and a first turning grating can also be provided. The second waveguide sheet 220 is provided with a second coupling grating 221 and a second output grating 222, and a second turning grating can also be provided. The third waveguide sheet 230 is provided with a third coupling grating 231 and a third output grating 232, and a third turning grating can also be provided.

[0065] The first coupling grating 211, the second coupling grating 221, and the third coupling grating 231 can be collectively referred to as coupling gratings for realizing the coupling of light rays. When the light rays are emitted to the full-color optical waveguide 200, the absolute value of the incident angle is usually less than the total reflection critical angle θ of the waveguide sheet c , and it cannot propagate in the form of back-and-forth reflection in the waveguide sheet. The coupling grating can diffract the light rays to change their incident angles, so that the absolute value of the incident angle of the light rays exceeds the total reflection critical angle θ of the waveguide sheet c , so that it can propagate back and forth in the waveguide sheet, thereby realizing the coupling of light rays. Specifically, the first coupling grating 211 can couple the first light rays in the image light beam into the first waveguide sheet 210, the second coupling grating 221 can couple the second light rays in the image light beam into the second waveguide sheet 220, and the third coupling grating 231 can couple the third light rays in the image light beam into the third waveguide sheet 230.

[0066] The first output grating 212, the second output grating 222, and the third output grating 232 can be collectively referred to as output gratings for realizing the output of light rays. When the light rays propagate back and forth in the waveguide sheet, the absolute value of the incident angle exceeds the total reflection critical angle θ of the waveguide sheet c , when irradiating the surface of the waveguide sheet in the waveguide sheet, they will be reflected back into the waveguide sheet and cannot be emitted out of the waveguide sheet. The output grating can diffract the light rays to change their incident angles, so that the absolute value of the incident angle of the light rays is less than the total reflection critical angle θ of the waveguide sheet c , so that it can be emitted out of the waveguide sheet, thereby realizing the output of light rays, and at the same time expanding the beam range in one direction to realize one-dimensional pupil expansion. Specifically, the first output grating 212 can output the first light rays from the first waveguide sheet 210, the second output grating 222 can output the second light rays from the second waveguide sheet 220, and the third output grating 232 can output the third light rays from the third waveguide sheet 230.

[0067] 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 achieve the turning of light. During the propagation of light from the coupling grating to the output grating in the waveguide sheet, the turning grating can diffract the light from the coupling grating and change its propagation direction within the waveguide sheet, causing the light to propagate towards the output grating. At the same time, the beam range is amplified in another direction, and together with the output grating, two-dimensional pupil expansion is achieved. Specifically, the first turning grating can change the propagation direction of the first light in the first waveguide sheet 210, the second turning grating can change the propagation direction of the second light in the second waveguide sheet 220, and the third turning grating can change the propagation direction of the third light in the third waveguide sheet 230. The coupling grating, the output grating, and the turning grating can all be selected as volume holographic gratings.

[0068] During the process of manufacturing the above-mentioned 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 separately, and then the first waveguide sheet 210, the second waveguide sheet 220, and the third waveguide sheet 230 (if any) are bonded together by means of 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 output grating 212, the second output grating 222, and the third output grating 232 (if any) are stacked, so that the first light, the second light, and the third light (if any) in the image beam can be coupled into the first waveguide sheet 210, the second waveguide sheet 220, and the third waveguide sheet 230 (if any) respectively from the same area of the full-color optical waveguide 200, and finally coupled out of the first waveguide sheet 210, the second waveguide sheet 220, and the third waveguide sheet 230 (if any) respectively from the same area of the full-color optical waveguide 200 by the first output grating 212, the second output grating 222, and the third output grating 232 (if any), and project the first image, the second image, and the third image (if any) respectively. These images are superimposed on each other to form a color virtual image.

[0069] Figures 3 - 5 Schematically shows the bonding method for manufacturing the above-mentioned full-color optical waveguide. This method can be used to quickly achieve the paired bonding of two or more waveguide sheets. The field of view (FOV) of the full-color optical waveguide obtained thereby can be accurately coincident, which helps to improve the production efficiency of the full-color optical waveguide and reduce the production cost. As Figure 3 shown, this method can include the following steps.

[0070] S110: Project an image beam onto a first waveguide sheet located at a first position at a second position, causing a first light ray in the image beam to be coupled into the first waveguide sheet through a first coupling grating and finally coupled out of the first waveguide sheet through a first output coupling grating to form a first image. Obtain the initial actual size of the first image at a third position, including the initial actual size in the X direction x 1 and the initial actual size in the Y direction y 1 .

[0071] In a display product, an optical engine projects an image beam onto a full-color optical waveguide, enabling each light ray in the image beam to be respectively coupled into a corresponding waveguide sheet through a corresponding coupling grating and finally coupled out of the waveguide sheet through a corresponding output coupling grating and enter the human eye, allowing the human eye to see a virtual image. In the image beam, the first light ray is transmitted through the first waveguide sheet and outputs a first image, the second light ray is transmitted through the second waveguide sheet and outputs a second image, and the third light ray (if any) is transmitted through the third waveguide sheet (if any) and outputs a 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 ray in the image beam being transmitted through the first waveguide sheet and outputting the first image to obtain the initial actual size of the first image. The device for projecting the image beam onto the first waveguide sheet at the second position can be an optical engine, and the device for obtaining the initial actual size of the first image at the third position can be a camera.

[0072] During the imaging process of a display product, the relative positions of the full-color optical waveguide, the optical engine, and the human eye affect the size of the virtual image seen by the human eye. Similarly, in this step and subsequent other steps, the relative positions of the first position, the second position, and the third position also affect the sizes of the images output after the light rays in the image beam are transmitted through the respective waveguide sheets. To prevent the relative position from becoming a disturbing factor for the image size, during the entire bonding process, the relative positions among the first position, the second position, and the third position always remain consistent. The relative positions of the first position, the second position, and the third position can be determined according to the positions of coupling and outputting the image beam in the full-color optical waveguide before performing this bonding method. Different from 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.

[0073] Whether it is the first image in this step or the second image, the third image, the fourth image, and the fifth image in subsequent steps, their initial actual sizes can be represented by x i × y i to represent, x i represents the initial actual size of the i-th image in the X direction, yi represents the initial actual size of the i-th image in the Y direction, x i and y i i in is represented by an Arabic numeral, and i in the i-th image is represented in Chinese. The X direction and the Y direction are perpendicular to each other.

[0074] S120: Project an image beam onto a second waveguide sheet located at a first position at a second position, so that a second light ray in the image beam is coupled into the second waveguide sheet from a second coupling grating and finally coupled out of the second waveguide sheet from a second output grating to form a second image. Obtain the initial actual size of the second image at a third position, including the initial actual size in the X direction x 2 and the initial actual size in the Y direction y 2 .

[0075] This step simulates the imaging process of the second light ray in the image beam passing through the second waveguide sheet and outputting the second image, so as to obtain the initial actual size of the second image. The device for projecting the image beam onto the second waveguide sheet at the second position can be an optical engine, and the device for obtaining the initial actual size of the second image at the third position can be a camera.

[0076] S130: Pre-fit the first waveguide sheet and the second waveguide sheet.

[0077] Theoretically, as long as the first waveguide sheet and the second waveguide sheet that are processed and formed strictly according to the optical design values are aligned and fitted, a full-color optical waveguide with the first image and the second image exactly coinciding can be obtained. In other words, the first image and the second image not only have the same theoretical size, but also their theoretical positions completely coincide. However, due to uncontrollable factors such as processing errors, the first image and the second image output by the directly aligned and fitted full-color optical waveguide often do not coincide, showing an obvious ghosting phenomenon in image testing. Adjusting the relative positions of the first waveguide sheet and the second waveguide sheet can make the first image and the second image exactly coincide. To facilitate the adjustment of the relative positions of the two sheets to be fitted, this step only makes the first waveguide sheet and the second waveguide sheet approach each other, and there is no actual contact between the first waveguide sheet and the second waveguide sheet, so as to avoid mutual collision and damage or even destruction during the adjustment process. For the convenience of description, the operation of making the two sheets to be pre-fitted approach each other and setting a distance is defined as pre-fitting in this case.

[0078] S140: Let the second waveguide sheet rotate by an angle of ± α around an axis parallel to the Y direction, and rotate by an angle of ± β around an axis parallel to the X direction, so that the actual size of the second image is the same as the actual size of the first image.

[0079] When adjusting the relative positions 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 or intersects with the plane where the second waveguide plate is located, thereby making the actual size of the second image 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.

[0080] Specifically, the second waveguide plate rotates by an angle + around an axis parallel to the Y direction α or - α After that, the actual size of the second image in the X direction will be consistent with the actual size of the first image in the X direction (the initial actual size x 1 ). If the second waveguide plate rotates by an angle + around an axis parallel to the Y direction α After that, the actual size of the second image in the X direction is not consistent with the actual size of the first image in the X direction (the initial actual size x 1 ), then the second waveguide plate should rotate by an angle - around an axis parallel to the Y direction α ; vice versa.

[0081] Similarly, the second waveguide plate rotates by an angle + around an axis parallel to the X direction β or - β After that, the actual size of the second image in the Y direction will be consistent with the actual size of the first image in the Y direction (the initial actual size y 1 ). If the second waveguide plate rotates by an angle + around an axis parallel to the X direction β After that, the actual size of the second image in the Y direction is not consistent with the actual size of the first image in the Y direction (the initial actual size y 1 ), then the second waveguide plate should rotate by an angle - around an axis parallel to the X direction β ; vice versa.

[0082] Therefore, step S140 may include the following steps:

[0083] S141: Project an image beam onto the second waveguide plate located at the first position at the second position, so that the second light ray in the image beam is coupled into the second waveguide plate from the second coupling grating and finally coupled out of the second waveguide plate from the second output grating to form a second image, and monitor 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;

[0084] S142: Let the second waveguide plate rotate by an angle + around an axis parallel to the Y direction α , and rotate by an angle + around an axis parallel to the X direction β ;

[0085] S143: 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, rotate the second waveguide plate by an angle of -2 around the axis parallel to the Y direction α ;

[0086] S144: 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, rotate the second waveguide plate by an angle of -2 around the axis parallel to the X direction β .

[0087] Step S141 simulates the imaging process of the second light ray in the image light beam passing 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 for projecting the image light beam onto the second waveguide plate at the second position can be an optical engine, and the device for monitoring the actual size of the second image in real time at the third position can be a camera.

[0088] The rotation angle of the second waveguide plate α satisfies: α =|arccos( x 0 / x 1 ) - arccos( x 0 / x 2 )|, and the angle β satisfies: β =|arccos( y 0 / y 1 ) - arccos( y 0 / y 2 )|. Among them, x 0 represents the theoretical sizes 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 light beam output device such as an optical engine and the parameters of the acquisition device such as a camera (ignoring the distortion error brought by the acquisition device such as a camera).

[0089] S150: Project an image beam onto a first waveguide sheet and a second waveguide sheet located at a first position at a second position, such that a first light ray in the image beam is coupled into the first waveguide sheet from a first coupling grating and finally coupled out of the first waveguide sheet from a first output grating, and at the same time, a second light ray in the image beam is coupled into the second waveguide sheet from a second coupling grating and finally coupled out of the second waveguide sheet from a second output grating, to form a fourth image, and obtain an initial actual size of the fourth image at a third position, including an initial actual size in the X direction x 4 and an initial actual size in the Y direction y 4 。

[0090] This step simulates the imaging process in which the first light ray in the image beam is transmitted through the first waveguide sheet and outputs a first image, and the second light ray is transmitted through the second waveguide sheet and outputs a second image, in order to obtain the initial actual size of the fourth image, which is formed by superimposing the first image and the second image. The device for projecting the image beam onto the first waveguide sheet and the second waveguide sheet at the second position can be an optical engine, and the device for obtaining the initial actual size of the fourth image at the third position can be a camera.

[0091] S160: Move the second waveguide sheet a distance of ± a in the X direction, and a distance of ± b in the Y direction, so that the actual size of the fourth image is the same as the actual size of the first image.

[0092] After adjusting the positional relationship between the first waveguide sheet and the second waveguide sheet by rotating the second waveguide sheet, the actual size of the second image becomes the same as 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 sheet to adjust the relative position between the first waveguide sheet and the second waveguide sheet, the position of the second image can be made to completely coincide 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 the same and their positions completely coincide, the actual size of the fourth image is the same as the actual size of the first image. In other words, the fact that the actual size of the fourth image is the same as the actual size of the first image means that the position of the second image completely coincides with the position of the first image.

[0093] Specifically, after the second waveguide sheet moves a distance of + a or - a in the X direction, 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 (the initial actual size x 1 ). If the second waveguide sheet moves a distance of + a in the X direction, 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 (the initial actual sizex 1 ), if they are inconsistent, the second waveguide sheet should be moved in the X direction by a distance of - a ; and vice versa. The distance by which the second waveguide sheet is moved a satisfies: a = | x 4 - x 1 |.

[0094] Similarly, after the second waveguide sheet is moved in the Y direction by a distance of + b or - b ), 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 (the initial actual size y 1 ). If after the second waveguide sheet is moved in the Y direction by a distance of + b ), the actual size of the fourth image in the Y direction is inconsistent with the actual size of the first image in the Y direction (the initial actual size y 1 ), then the second waveguide sheet should be moved in the Y direction by a distance of - b ; and vice versa. The distance by which the second waveguide sheet is moved b satisfies: b = | y 4 - y 1 |.

[0095] Therefore, step S160 may include the following steps:

[0096] S161: Project an image beam onto the first waveguide sheet and the second waveguide sheet located at the first position at the second position, so that the first light ray in the image beam is coupled into the first waveguide sheet from the first coupling grating and finally coupled out of the first waveguide sheet from the first output grating, and at the same time, the second light ray in the image beam is coupled into the second waveguide sheet from the second coupling grating and finally coupled out of the second waveguide sheet from the second output grating, to form a fourth image, and monitor 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;

[0097] S162: Move the second waveguide sheet in the X direction by a distance of a and in the Y direction by a distance of b ;

[0098] S163: 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 sheet in the X direction by a distance of -2 a ;

[0099] S164: 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 plate along the Y direction by a distance of -2 b .

[0100] Step S161 simulates the imaging process in which the first light ray in the image light beam is transmitted through the first waveguide plate and outputs the first image, and the second light ray is transmitted through the second waveguide plate and outputs the second image, so as to monitor the actual size of the fourth image in real time. The fourth image is formed by superimposing the first image and the second image. The device that projects the image light beam onto the first waveguide plate and the second waveguide plate at the second position can be an optical engine, and the device that monitors the actual size of the fourth image in real time at the third position can be a camera.

[0101] S170: Inject glue between the first waveguide plate and the second waveguide plate to make the first waveguide plate and the second waveguide plate fit together.

[0102] After the processing of steps S110 to S160, the first image formed by the transmission of the image light beam through the first waveguide plate and the second image formed by the transmission 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 at this time are fixed, a full-color optical waveguide with accurately overlapping fields of view can be obtained.

[0103] After injecting glue between the first waveguide plate and the second waveguide plate, the glue injected between the first waveguide plate and the second waveguide plate can be cured by natural curing, heat curing, light curing, etc. After the glue injected between the first waveguide plate and the second waveguide plate is cured, the relative positions of the first waveguide plate and the second waveguide plate are fixed, thereby realizing the fitting of the first waveguide plate and the second waveguide plate.

[0104] In the above steps S110 to S170, the execution order of steps S110, S120, and S130 can be swapped, as long as it is completed before executing steps S140 to S170.

[0105] For a three-piece full-color optical waveguide configured with a first waveguide plate, a second waveguide plate, and a third waveguide plate, the fitting process not only requires fitting the first waveguide plate and the second waveguide plate, but also requires fitting the third waveguide plate with the first waveguide plate and the second waveguide plate. Figure 4 Illustrates a fitting method for manufacturing a three-piece full-color optical waveguide. This method can not only include the above steps S110 to S170, but also include steps S210 to S260.

[0106] S210: Project an image beam onto a third waveguide sheet located at the first position at the second position, so that the third light ray in the image beam is coupled into the third waveguide sheet through the third coupling grating, and finally coupled out of the third waveguide sheet through the third output grating to form a third image. Obtain the 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 .

[0107] This step simulates the imaging process of the third light ray in the image beam being transmitted through the third waveguide sheet and outputting the third image, so as to obtain the initial actual size of the third image. The device for projecting the image beam onto the third waveguide sheet at the second position can be an optical engine, and the device for obtaining the initial actual size of the third image at the third position can be a camera.

[0108] S220: Pre-bond the third waveguide sheet with the first waveguide sheet and the second waveguide sheet.

[0109] Theoretically, as long as the third waveguide sheet, which is processed and formed strictly according to the optical design values, is aligned and bonded with the first waveguide sheet and the second waveguide sheet, a full-color optical waveguide with the third image exactly coinciding with the first image and the second image can be obtained. In other words, the third image, the first image, and the second image not only have the same theoretical size but also completely coincide in theoretical position. However, due to difficult-to-control factors such as processing errors, the third image output by the directly aligned and bonded full-color optical waveguide often does not coincide with the first image and the second image, showing obvious ghosting phenomena in image tests. Adjusting the relative positions of the third waveguide sheet, the first waveguide sheet, and the second waveguide sheet can make the third image exactly coincide with the first image and the second image. This step pre-bonds the third waveguide sheet with the first waveguide sheet and the second waveguide sheet to facilitate adjusting the relative positions of the third waveguide sheet, the first waveguide sheet, and the second waveguide sheet in the subsequent steps S230 and S250.

[0110] S230: Rotate the third waveguide sheet by an angle of ± θ around the axis parallel to the Y direction, and rotate by an angle of ± δ around the axis parallel to the X direction, so that the actual size of the third image is the same as the actual sizes of the first image, the second image, or the fourth image.

[0111] When adjusting the relative positions of the third waveguide sheet with the first and second waveguide sheets, the positional relationship between the third waveguide sheet and the first and second waveguide sheets 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 planes where the first and second waveguide sheets are located, thereby making the actual size of the third image the same as the actual sizes of the first, second, or fourth images. Since the first waveguide sheet is not rotated, the actual size of the first image is its initial actual size; after the processing in steps S140 to S160, the actual sizes of the second and fourth images are also the same as the actual size of the first image; therefore, the actual sizes of the first, second, or fourth images are no different from the initial actual size of the first image.

[0112] Specifically, when the third waveguide sheet rotates by an angle + θ or - θ around an axis parallel to the Y direction, the actual size of the third image in the X direction will be the same as the actual sizes of the first, second, or fourth images in the X direction (the initial actual size of the first image in the X direction x 1 ). If, after the third waveguide sheet rotates by an angle + θ around an axis parallel to the Y direction, the actual size of the third image in the X direction is not the same as the actual sizes of the first, second, or fourth images in the X direction (the initial actual size of the first image in the X direction x 1 ), then the third waveguide sheet should rotate by an angle - θ around an axis parallel to the Y direction; and vice versa.

[0113] Similarly, when the third waveguide sheet rotates by an angle + δ or - δ around an axis parallel to the X direction, the actual size of the third image in the Y direction will be the same as the actual sizes of the first, second, or fourth images in the Y direction (the initial actual size of the first image in the Y direction y 1 ). If, after the third waveguide sheet rotates by an angle + δ around an axis parallel to the X direction, the actual size of the third image in the Y direction is not the same as the actual sizes of the first, second, or fourth images in the Y direction (the initial actual size of the first image in the Y direction y 1 ), then the third waveguide sheet should rotate by an angle - δ around an axis parallel to the X direction; and vice versa.

[0114] Therefore, step S230 may include the following steps:

[0115] S231: Project an image beam onto a third waveguide sheet at a second position, such that a third light ray in the image beam is coupled into the third waveguide sheet through a third coupling grating, and finally coupled out of the third waveguide sheet through a third output grating to form a third image. Monitor the actual size of the third image in real time at a third position, including the actual size in the X direction and the actual size in the Y direction.

[0116] S232: Rotate the third waveguide sheet by an angle + θ about an axis parallel to the Y direction, and rotate by an angle + δ about an axis parallel to the X direction;

[0117] S233: Determine whether the actual size of the third 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, then rotate the third waveguide sheet by an angle -2 θ about an axis parallel to the Y direction;

[0118] S234: Determine whether the actual size of the third 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, then rotate the third waveguide sheet by an angle -2 δ about an axis parallel to the X direction.

[0119] Step S231 simulates the imaging process of the third light ray in the image beam being transmitted through the third waveguide sheet and outputting the third image, so as to monitor the actual size of the third image in real time. The device for projecting the image beam onto the third waveguide sheet at the second position can be an optical engine, and the device for monitoring the actual size of the third image in real time at the third position can be a camera.

[0120] The angle θ by which the third waveguide sheet rotates satisfies: θ =|arccos( x 0 / x 1 ) - arccos( x 0 / x 3 )|, and the angle δ satisfies: δ =|arccos( y 0 / y 1 ) - arccos( y 0 / y 3 )|. Where x 0Indicates the theoretical sizes of the first image, the second image, and the third image in the X direction. y 0 Indicates the theoretical sizes 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 the same, and can be calculated according to the size of the virtual image output by an image beam output device such as an optical engine, and the parameters of an acquisition device such as a camera (ignoring the distortion error brought by the acquisition device such as a camera).

[0121] S240: Project an image beam onto the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet located at the first position at the second position, so that the first light ray in the image beam is coupled into the first waveguide sheet from the first coupling grating and finally coupled out of the first waveguide sheet from the first output grating, so that the second light ray in the image beam is coupled into the second waveguide sheet from the second coupling grating and finally coupled out of the second waveguide sheet from the second output grating. At the same time, the third light ray in the image beam is coupled into the third waveguide sheet from the third coupling grating and finally coupled out of the third waveguide sheet from the third output grating to form a fifth image, and obtain 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 .

[0122] This step simulates the imaging process in which the first light ray in the image beam is transmitted through the first waveguide sheet and outputs the first image, the second light ray is transmitted through the second waveguide sheet and outputs the second image, and the third light ray is transmitted through the third waveguide sheet and outputs the third image, so as to obtain the initial actual size of the fifth image. The fifth image is formed by superimposing the third image with the first image and the second image. The device for projecting the image beam onto the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet at the second position can be an optical engine, and the device for obtaining the initial actual size of the fifth image at the third position can be a camera.

[0123] S250: Move the third waveguide sheet a distance of ± in the X direction c And move a distance of ± in the Y direction d To make the actual size of the fifth image the same as the actual size of the first image, the second image, or the fourth image.

[0124] After adjusting the positional relationship between the third waveguide plate and the first waveguide plate and the second waveguide plate by rotating the third waveguide plate, the actual size of the third image becomes the same as the actual sizes of the first image, the second image, and the fourth image. However, the position of the third image may not completely coincide 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 positions of the third waveguide plate and the first waveguide plate and the second waveguide plate, the position of the third image can be made to completely coincide 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 form the fourth image by superimposition. Therefore, it can also be said that the fifth image is formed by superimposing the third image with the fourth image. After the processing steps S140 to S160, the first image, the second image, and the fourth image not only have the same actual size but also have completely coincident positions. Therefore, when the actual size of the third image is the same as and the position is completely coincident with those of the first image, the second image, and the fourth image, the actual size of the fifth image is the same as the actual sizes of the first image, the second image, and the fourth image. In other words, the fact that the actual size of the fifth image is the same as the actual size of the first image, the second image, or the fourth image means that the position of the third image is completely coincident with the positions of the first image, the second image, and the fourth image.

[0125] Specifically, when the third waveguide plate moves a distance of + c or - c in the X direction, the actual size of the fifth image in the X direction will be the same as the actual sizes 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, after the third waveguide plate moves a distance of + c in the X direction, the actual size of the fifth image in the X direction is not the same as the actual sizes 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 ), then the third waveguide plate should move a distance of - c in the X direction; and vice versa. The distance c by which the third waveguide plate moves satisfies: c =| x 5 - x 1 |.

[0126] Similarly, when the third waveguide plate moves a distance of + d or - d in the Y direction, the actual size of the fifth image in the Y direction will be the same as the actual sizes 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 plate moves a distance of + along the Y direction d After that, the actual size of the fifth image in the Y direction is different from 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 ), inconsistent, then the third waveguide plate should move a distance of - along the Y direction d ; vice versa. The distance that the third waveguide plate moves d Satisfy: d =| y 5 - y 1 |.

[0127] Therefore, step S250 may include the following steps:

[0128] S251: Project an image beam onto the first waveguide plate, the second waveguide plate, and the third waveguide plate located at the first position at the second position, so that the first light ray 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-out grating, so that the second light ray in the image beam is coupled into the second waveguide plate from the second coupling grating and finally coupled out of the second waveguide plate from the second coupling-out grating. At the same time, the third light ray in the image beam is coupled into the third waveguide plate from the third coupling grating and finally coupled out of the third waveguide plate from the third coupling-out grating to form a fifth image, and the actual size of the fifth image is monitored in real time at the third position, including the actual size in the X direction and the actual size in the Y direction;

[0129] S252: Let the third waveguide plate move a distance of c along the X direction and a distance of d along the Y direction;

[0130] S253: Determine whether the actual size of the fifth image in the X direction is consistent with the initial actual size of the first image in the X direction x 1 ; if not, let the third waveguide plate move a distance of -2 c along the X direction;

[0131] S254: Determine whether the actual size of the fifth image in the Y direction is consistent with the initial actual size of the first image in the Y direction y 1 ; if not, let the third waveguide plate move a distance of -2 d along the Y direction.

[0132] Step S251 simulates the imaging process in which the first light ray in the image light beam is transmitted through the first waveguide sheet and outputs the first image, the second light ray is transmitted through the second waveguide sheet and outputs the second image, and the third light ray is transmitted through the third waveguide sheet and outputs the third image, so as to monitor the actual size of the fifth image in real time. The fifth image is formed by superimposing the third image with the first image and the second image. The device that projects the image light beam onto the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet at the second position can be an optical engine, and the device that monitors the actual size of the fifth image in real time at the third position can be a camera.

[0133] S260: Inject glue between the third waveguide sheet and the first waveguide sheet / second waveguide sheet to make the first waveguide sheet fit with the second waveguide sheet / third waveguide sheet.

[0134] After the processing of steps S110 to S160 and steps S210 to S250, the third image formed by the transmission of the image light beam through the third waveguide sheet, the first image formed by the transmission through the first waveguide sheet, and the second image formed by the transmission through the second waveguide sheet can be accurately overlapped. As long as the relative positions of the third waveguide sheet, the first waveguide sheet, and the second waveguide sheet at this time are fixed, a full-color optical waveguide with accurately overlapping fields of view can be obtained.

[0135] After injecting glue between the third waveguide sheet and the first waveguide sheet / second waveguide sheet, the glue injected between the third waveguide sheet and the first waveguide sheet / 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 / second waveguide sheet is cured, the relative positions of the third waveguide sheet, the first waveguide sheet, and the second waveguide sheet are fixed, thereby realizing the fitting of the third waveguide sheet with the first waveguide sheet and the second waveguide sheet.

[0136] In the above steps S210 to S260, the execution order of steps S210 and S220 can be swapped, as long as it is completed before executing steps S230 to S260.

[0137] Figure 5 Schematically shows another fitting method for manufacturing a three-piece full-color optical waveguide. This method can not only include the above steps S110 to S170, but also include steps S310 to S360.

[0138] S310: Project an image light beam onto the third waveguide sheet located at the first position at the second position, so that the third light ray in the image light beam is coupled into the third waveguide sheet through the third coupling grating and finally coupled out of the third waveguide sheet through the third output grating to form a third image. Obtain the 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 .

[0139] This step simulates the imaging process of the third light ray in the image light beam passing through the third waveguide sheet and outputting the third image, so as to obtain the initial actual size of the third image. The device for projecting the image light beam onto the third waveguide sheet at the second position can be an optical engine, and the device for obtaining the initial actual size of the third image at the third position can be a camera.

[0140] S320: Pre-fit the third waveguide sheet with the already-fitted first waveguide sheet and second waveguide sheet.

[0141] Theoretically, as long as the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet processed and formed strictly according to the optical design values are aligned and fitted, a full-color optical waveguide with the first image, the second image, and the third image precisely coinciding can be obtained. In other words, the first image, the second image, and the third image not only have the same theoretical size but also their theoretical positions completely coincide. However, due to uncontrollable factors such as processing errors, the first image, the second image, and the third image output by the directly aligned and fitted full-color optical waveguide often do not coincide, showing obvious ghosting phenomena in image tests. 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 coincide. This step pre-fits the third waveguide sheet with the already-fitted first waveguide sheet and second waveguide sheet to adjust the relative positions of the third waveguide sheet with the already-fitted first waveguide sheet and second waveguide sheet in subsequent steps S330 and S350.

[0142] S330: Rotate the already-fitted first waveguide sheet and second waveguide sheet by an angle of ± θ about the axis parallel to the Y direction, and rotate by an angle of ± δ about the axis parallel to the X direction to make the actual size of the first image, the second image, or the fourth image the same as the actual size of the third image.

[0143] When adjusting the relative positions of the third waveguide sheet with the already-fitted first waveguide sheet and second waveguide sheet, the positional relationship between the third waveguide sheet and the already-fitted first waveguide sheet and second waveguide sheet can be adjusted by rotating the already-fitted first waveguide sheet and second waveguide sheet, so that the plane where the already-fitted first waveguide sheet and second waveguide sheet are located is parallel 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 the same as the actual size of the third image. After the processing in steps S140 to S160, the actual sizes of the first image, the second image, and the fourth image have become the same. Using the comparison of any one of them with the actual size of the third image as the condition for judging whether the already-fitted first waveguide sheet and second waveguide sheet are rotated in place is acceptable. Since the third waveguide sheet is not rotated, the actual size of the third image is its initial actual size.

[0144] Specifically, after the first waveguide sheet and the second waveguide sheet are attached and rotated by an angle + θ or - θ about an axis parallel to the Y direction, 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 (the initial actual size x 3 ). If, after the first waveguide sheet and the second waveguide sheet are attached and rotated by an angle + θ about an axis parallel to the Y direction, the actual size of the first image, the second image, or the fourth image in the X direction is not the same as the actual size of the third image in the X direction (the initial actual size x 3 ), then the attached first waveguide sheet and second waveguide sheet should be rotated by an angle - θ about an axis parallel to the Y direction; and vice versa.

[0145] Similarly, after the first waveguide sheet and the second waveguide sheet are attached and rotated by an angle + δ or - δ about an axis parallel to the X direction, 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 (the initial actual size y 3 ). If, after the first waveguide sheet and the second waveguide sheet are attached and rotated by an angle + δ about an axis parallel to the X direction, the actual size of the first image, the second image, or the fourth image in the Y direction is not the same as the actual size of the third image in the Y direction (the initial actual size y 3 ), then the attached first waveguide sheet and second waveguide sheet should be rotated by an angle - δ about an axis parallel to the X direction; and vice versa.

[0146] Therefore, step S330 may include the following steps:

[0147] S331: Project an image beam onto the first waveguide sheet and the second waveguide sheet located at the first position at the second position, so that the first light ray in the image beam is coupled into the first waveguide sheet from the first coupling grating and finally coupled out of the first waveguide sheet from the first output grating, and at the same time, the second light ray in the image beam is coupled into the second waveguide sheet from the second coupling grating and finally coupled out of the second waveguide sheet from the second output grating, to form a fourth image, and monitor 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;

[0148] S332: Rotate the attached first waveguide sheet and second waveguide sheet by an angle + θ about an axis parallel to the Y direction, and rotate by an angle + δ about an axis parallel to the X direction;

[0149] S333: Determine whether the actual size of the fourth image in the X direction is the same as the initial actual size of the third image in the X direction x 3 ; if not, rotate the already - attached first waveguide sheet and second waveguide sheet by an angle -2 around the axis parallel to the Y direction θ ;

[0150] S334: Determine whether the actual size of the fourth image in the Y direction is the same as the initial actual size of the third image in the Y direction y 3 ; if not, rotate the already - attached first waveguide sheet and second waveguide sheet by an angle -2 around the axis parallel to the X direction δ 。

[0151] Step S331 simulates the imaging process in which the first ray in the image beam is transmitted through the first waveguide sheet and outputs the first image, and the second ray is transmitted through the second waveguide sheet and outputs the second image, so as to monitor the actual size of the fourth image in real - time. The fourth image is formed by superimposing the first image and the second image. The device for projecting the image beam onto the first waveguide sheet and the second waveguide sheet at the second position can be an optical engine, and the device for monitoring the actual size of the fourth image at the third position can be a camera.

[0152] The angle by which the already - attached first waveguide sheet and second waveguide sheet rotate θ satisfies: θ =|arccos( x 0 / x 1 ) - arccos( x 0 / x 3 )|, and the angle δ satisfies: δ =|arccos( y 0 / y 1 ) - arccos( y 0 / y 3 )|. Wherein, x 0 represents the theoretical size of the first image, the second image, and the third image in the X direction, y 0Indicates the theoretical sizes 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 the same, and can be calculated based on the size of the virtual image output by an image beam output device such as an optical engine and the parameters of an acquisition device such as a camera (ignoring the distortion error brought by the acquisition device such as a camera).

[0153] S340: Project an image beam onto the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet located at the first position at the second position, so that the first light ray in the image beam is coupled into the first waveguide sheet from the first coupling grating and finally coupled out of the first waveguide sheet from the first output grating, so that the second light ray in the image beam is coupled into the second waveguide sheet from the second coupling grating and finally coupled out of the second waveguide sheet from the second output grating. At the same time, the third light ray in the image beam is coupled into the third waveguide sheet from the third coupling grating and finally coupled out of the third waveguide sheet from the third output grating to form a fifth image, and obtain 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 .

[0154] This step simulates the imaging process in which the first light ray in the image beam is transmitted through the first waveguide sheet and outputs the first image, the second light ray is transmitted through the second waveguide sheet and outputs the second image, and the third light ray is transmitted through the third waveguide sheet 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 for projecting the image beam onto the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet at the second position can be an optical engine, and the device for obtaining the initial actual size of the fifth image at the third position can be a camera.

[0155] S350: Move the already attached first waveguide sheet and second waveguide sheet by a distance of ± c in the X direction and by a distance of ± d in the Y direction, so that the actual size of the fifth image is the same as the actual size of the third image.

[0156] After adjusting the positional relationship between the third waveguide sheet and the first and second waveguide sheets that have been adhered by rotating the adhered first and second waveguide sheets, the actual sizes of the first, second, and fourth images become the same as the actual size of the third image, but the positions of the first, second, and fourth images may not exactly coincide with the position of the third image. At this time, by moving the adhered first and second waveguide sheets to adjust the relative positions of the third waveguide sheet and the adhered first and second waveguide sheets, the positions of the first, second, and fourth images can be made to exactly coincide 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 form the fourth image by superimposition. Therefore, it can also be said that the fifth image is formed by superimposing the third image with the fourth image. After the processing steps S140 to S160, the first, second, and fourth images not only have the same actual size but also exactly coincide in position. Therefore, when the first, second, or fourth image has the same actual size as the third image and exactly coincides in position, the actual size of the fifth image is the same as the actual size of the third image. In other words, the fact that the actual size of the fifth image is the same as the actual size of the third image means that the positions of the first, second, and fourth images exactly coincide with the position of the third image.

[0157] Specifically, after the adhered first and second waveguide sheets are moved a distance of + c or - c in the X direction, 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 (the initial actual size x 3 ). If, after the adhered first and second waveguide sheets are moved a distance of + c in the X direction, the actual size of the fifth image in the X direction is not the same as the actual size of the third image in the X direction (the initial actual size x 3 ), then the adhered first and second waveguide sheets should be moved a distance of - c in the X direction; and vice versa. The distance c by which the adhered first and second waveguide sheets are moved satisfies: c =| x 5 - x 1 |.

[0158] Similarly, after the adhered first and second waveguide sheets are moved a distance of + d or - d in the Y direction, 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 (the initial actual size y 3), consistent. If the first waveguide sheet and the second waveguide sheet that have been attached move a distance of + along the Y direction d after that, the actual size of the fifth image in the Y direction is not consistent with the actual size of the third image in the Y direction (the initial actual size y 3 ), then the attached first waveguide sheet and second waveguide sheet should move a distance of - along the Y direction d ; and vice versa. The distance that the attached first waveguide sheet and second waveguide sheet move d satisfies: d = | y 5 - y 1 |.

[0159] Therefore, step S350 may include the following steps:

[0160] S351: Project an image beam onto the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet located at the first position at the second position, so that the first light ray in the image beam is coupled into the first waveguide sheet from the first coupling grating and finally coupled out of the first waveguide sheet from the first output grating, the second light ray in the image beam is coupled into the second waveguide sheet from the second coupling grating and finally coupled out of the second waveguide sheet from the second output grating, and at the same time the third light ray in the image beam is coupled into the third waveguide sheet from the third coupling grating and finally coupled out of the third waveguide sheet from the third output grating to form a fifth image, and monitor 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;

[0161] S352: Let the attached first waveguide sheet and second waveguide sheet move a distance of c along the X direction and a distance of d along the Y direction;

[0162] S353: Determine whether the actual size of the fifth image in the X direction is consistent with the initial actual size of the third image in the X direction x 3 ; if not, let the attached first waveguide sheet and second waveguide sheet move a distance of -2 c along the X direction;

[0163] S354: Determine whether the actual size of the fifth image in the Y direction is consistent with the initial actual size of the third image in the Y direction y 3 ; if not, let the attached first waveguide sheet and second waveguide sheet move a distance of -2 d along the Y direction.

[0164] Step S351 simulates the imaging process of the first ray in the image beam transmitting through the first waveguide plate and outputting the first image, the second ray transmitting through the second waveguide plate and outputting the second image, and the third ray transmitting through the third waveguide plate and outputting the third image, so as to monitor the actual size of the fifth image in real time. The fifth image is formed by superimposing the third image with the first image and the second image. The device for projecting the image beam onto the first waveguide plate, the second waveguide plate, and the third waveguide plate at the second position can be an optical engine, and the device for monitoring the actual size of the fifth image in real time at the third position can be a camera.

[0165] S360: Inject glue between the third waveguide plate and the first waveguide plate / second waveguide plate to make the first waveguide plate, the second waveguide plate, and the third waveguide plate fit together.

[0166] After the processing of steps S110 to S170 and steps S310 to S350, the third image formed by the image beam transmitting through the third waveguide plate, the first image formed by transmitting through the first waveguide plate, and the second image formed by transmitting through the second waveguide plate can be accurately overlapped. As long as the relative positions of the third waveguide plate, the first waveguide plate, and the second waveguide plate at this time are fixed, a full-color optical waveguide with accurately overlapping fields of view can be obtained.

[0167] After injecting glue between the third waveguide plate and the first waveguide plate / second waveguide plate, the glue injected between the third waveguide plate and the first waveguide plate / second waveguide plate can be cured by natural curing, heat curing, light curing, etc. After the glue injected between the third waveguide plate and the first waveguide plate / second waveguide plate is cured, the relative positions of the third waveguide plate, the first waveguide plate, and the second waveguide plate are fixed, thereby realizing the fitting of the third waveguide plate with the first waveguide plate and the second waveguide plate.

[0168] In the above steps S210 to S260, the execution order of steps S310 and S320 can be swapped, as long as it is completed before executing steps S230 to S260.

[0169] Figure 6 Schematically shows the fitting device for manufacturing a full-color optical waveguide. This device can Figures 3 - 5 realize the fitting of each waveguide plate in the full-color optical waveguide by using the Figure 6 method shown. As

[0170] The optical engine 100 serves as an image output mechanism for projecting an image beam with a virtual image onto a waveguide sheet located at the first position at the second position, causing at least part of the light rays in the image beam to be coupled into the grating and then out of the grating of the waveguide sheet, forming a corresponding image at the third position. The optical engine 100 can be the optical engine 100 commonly used in display products, specifically, it can be a DLP (Digital Light Processing) optical engine module, an LCOS (Liquid Crystal on Silicon) optical engine module, an LBS (Laser Beam Scanning) optical engine module, an OLED (Organic Light-Emitting Diode) display module, etc.

[0171] Apply Figure 3 When the method shown is used to realize the bonding of the first waveguide sheet and the second waveguide sheet in the full-color optical waveguide, the optical engine 100 is used to project an image beam onto the first waveguide sheet, the second waveguide sheet, or the first waveguide sheet and the second waveguide sheet located at the first position at the second position. Specifically, the optical engine 100 is used to project an image beam onto the first waveguide sheet located at the first position at the second position in step S110, and is used to project an image beam onto the second waveguide sheet located at the first position at the second position in steps S120 and S141, and is used to project an image beam onto the first waveguide sheet and the second waveguide sheet located at the first position at the second position in steps S150 and S161.

[0172] Apply Figures 4 - 5 When the method shown is used to realize the bonding of the third waveguide sheet and the other two waveguide sheets in the full-color optical waveguide, the optical engine 100 is also used to project an image beam onto the third waveguide sheet located at the first position at the second position, or the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet. Specifically, the optical engine 100 is used to project an image beam onto the third waveguide sheet located at the first position at the second position in steps S210, S231, and S310, and is used to project an image beam onto the first waveguide sheet, the second waveguide sheet, and the third waveguide sheet located at the first position at the second position in steps S240, S251, S340, and S351, and is used to project an image beam onto the first waveguide sheet and the second waveguide sheet located at the first position at the second position in step S331.

[0173] The camera 300 serves as an image acquisition mechanism for acquiring and even real-time monitoring the image and its actual size (including the initial actual size) transmitted and output by the waveguide sheet located at the first position at the third position, so as to calculate the rotation angle and moving distance of the waveguide sheet to be adjusted, thereby quickly completing the pairing and bonding of each waveguide sheet in the full-color optical waveguide.

[0174] Apply Figure 3When the method shown realizes the fitting 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 sizes of the first image, the second image, or the fourth image at the third position, and is even used to monitor the actual sizes 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 sizes of the first image and the second image at the third position in step S150, to monitor the actual size of the second image in real time at the third position in step S141, and to monitor the actual size of the fourth image in real time at the third position in step S161.

[0175] Apply Figures 4 - 5 When the method shown realizes the fitting of the third waveguide sheet and the other two waveguide sheets in the full-color optical waveguide, the camera 300 is also used to obtain the initial actual sizes of the third image or the fifth image at the third position, and is even used to monitor the actual sizes 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 in real time at the third position in step S231, to monitor the actual sizes of the fifth image in real time at the third position in steps S251 and S351, and to monitor the actual size of the fourth image in real time at the third position in step S331.

[0176] The jig 400, as an assisting control mechanism, is used to load the waveguide sheets so that the waveguide sheets are positioned at the first position, and is also used to rotate and move a part of the waveguide sheets so that the images transmitted and output through this part of the waveguide sheets are completely coincident with the images transmitted and output through another part of the waveguide sheets, so as to make the fields of view of the respective parts of the waveguide sheets in the full-color optical waveguide accurately coincident.

[0177] Apply Figure 3 When the method shown realizes the fitting of the first waveguide sheet and the second waveguide sheet in the full-color optical waveguide, the jig 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 jig 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.

[0178] Apply Figures 4 - 5When the method shown realizes the fitting of the third waveguide sheet and the other two waveguide sheets in the full-color optical waveguide, the jig 400 is also used for: loading and positioning the third waveguide sheet, or the first, second, and third waveguide sheets to the first position; rotating or moving the third waveguide sheet or the already-fitted first and second waveguide sheets. Specifically, the jig 400 is used for loading and positioning the third waveguide sheet to the first position in steps S210 and S310, for loading and positioning the first, second, and third waveguide sheets to the first position in steps S220 to S260 and steps S320 to S360, for rotating the third waveguide sheet in step S230, for moving the third waveguide sheet in step S250, for rotating the already-fitted first and second waveguide sheets in step S330, and for moving the already-fitted first and second waveguide sheets in step S350.

[0179] The jig 400 may include a first jig 410 and a second jig 420. The first jig 410 is used for loading and positioning the first, second, and third waveguide sheets, or the already-fitted first and second waveguide sheets. The second jig 420 is used for loading and positioning, rotating, and moving the second and third waveguide sheets, or the already-fitted first and second waveguide sheets. Specifically, in steps S110 to S170, the first waveguide sheet may be loaded by the first jig 410 to be positioned at the first position, and the second waveguide sheet may be loaded by the second jig 420 to be positioned at the first position, and may also be rotated or moved under the action of the second jig 420. In steps S210 to S260, the third waveguide sheet may be loaded by the first jig 410 to be positioned at the first position, and the already-fitted first and second waveguide sheets may be loaded by the second jig 420 to be positioned at the first position, and may also be rotated or moved under the action of the second jig 420. In steps S310 to S360, the already-fitted first and second waveguide sheets may be loaded by the first jig 410 to be positioned at the first position, and the third waveguide sheet may be loaded by the second jig 420 to be positioned at the first position, and may also be rotated or moved under the action of the second jig 420. In addition, in step S110, the first waveguide sheet may also be loaded by the second jig 420 to be positioned at the first position; in step S120, the second waveguide sheet may also be loaded by the first jig 410 to be positioned at the first position; in step S210, the third waveguide sheet may also be loaded by the second jig 420 to be positioned at the first position; and in step S310, the third waveguide sheet may also be loaded by the first jig 410 to be positioned at the first position.

[0180] The first fixture 410 can also have the functions of grasping and moving, so as to grasp 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 at the first position. Similarly, the second fixture 420 can also have the functions of grasping and moving, so as to grasp 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 at the first position.

[0181] For the first fixture 410 that does not have the functions of grasping and moving, the device can also be equipped with a first grasping mechanism (not shown) to grasp 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 onto the first fixture 410. Similarly, for the second fixture 420 that does not have the functions of grasping and moving, the device can also be equipped with a second grasping mechanism (not shown) to grasp and move the second waveguide sheet, the third waveguide sheet, or the first waveguide sheet and the second waveguide sheet that have been bonded onto the second fixture 420.

[0182] The device can also be equipped with a dispensing machine (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 dispensing machine 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 dispensing machine can have a curing function, which can specifically be thermal 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.

[0183] Obviously, the above-mentioned embodiments of this solution are only examples for clearly explaining this solution, rather than limitations on the implementation manners of this solution. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of this solution shall be included within the protection scope of the claims of this solution.

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 so that the third waveguide sheet is bonded to the first waveguide sheet; or injecting glue between the third waveguide sheet and the second waveguide sheet so that the third waveguide sheet is bonded to the second 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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