Method for eliminating ghost images of reflective coupled AR optical module, AR optical module and AR device

Abstract

The present invention discloses a method for eliminating ghost images of a reflective coupled AR optical module, an AR optical module and an AR device, the method comprising setting an optical machine exit pupil surface on a side of a coupling surface of a waveguide plate away from the optical machine, and determining the optical machine exit pupil surface comprises the following steps: Step 1: determining the corresponding effective area of ​​the light of N fields of view emitted by the optical machine on the coupling surface; Step 2: extending the coupled light of each field of view at the end point of its corresponding effective area away from the side of the dichroic film; Step 3: setting the optical machine exit pupil surface to be located at the position where the extended coupled light of all N fields of view is most concentrated; Step 4: setting the intersection of the extended coupled light of all N fields of view and the plane where the optical machine exit pupil surface is located, the point closest to the dichroic film is the end point of the optical machine exit pupil surface away from the dichroic film. The present invention belongs to the field of augmented reality technology, and has the beneficial effect of avoiding the generation of ghost images while ensuring image brightness and image uniformity.

Description

Technical Field

[0001] The present invention relates to the field of augmented reality (AR) technology, and in particular to a method for eliminating ghost images of a reflectively coupled AR light module, an AR light module and an AR device. Background Art

[0002] Reflective coupling AR optical module is one of the current mainstream AR optical modules. The optical axis of the optical machine of this type of optical module is perpendicular to the surface of the waveguide, which is very suitable for making AR glasses. Figure 1 The figure shows a schematic diagram of the structure of a typical reflective coupling AR optical module, in which the exit pupil plane 11 of the optical machine 1 is arranged on the total reflection plane of the waveguide plate 2 on the side close to the optical machine 1, and the total reflection plane is called the coupling plane. After the light emitted by the optical machine is refracted from the coupling plane of the waveguide plate 2 and enters the waveguide plate 2, it is totally reflected by a reflection plane 23, and then propagates by total reflection with the help of the two total reflection planes 21 of the waveguide plate, and finally couples out of the waveguide plate 2 through a group of parallelly arranged splitter films 22, wherein the angle between the reflection plane 23 and the total reflection plane 21 is the same as the angle between each splitter film 22 and the total reflection plane 21, that is, the reflection plane 23 and each splitter film 22 are parallel to each other. In this type of reflective coupling AR optical module, the light of part of the field of view emitted by the optical machine 1 will form stray light after being reflected by the reflection plane 23, and then form a ghost image.

[0003] For this type of reflective-coupled AR optical module, one method to eliminate ghost images is to set the appropriate position of the optical machine exit pupil endpoint.

[0004] Specifically, Figure 1 The area within the dotted line marked with A is enlarged, such as Figure 2 shown. Figure 2Take the light of zero field of view, i.e. the light parallel to the optical axis of the optical machine, as an example to illustrate the position of the left end point of the light machine exit pupil surface when eliminating ghost images. At this time, the exit pupil surface 11 of the optical machine 1 is located on the coupling surface. In the figure, A2-1, B2-1, C2-1 and D2-1 represent the four zero field of view rays emitted by the optical machine, among which the rays A2-1 and D2-1 are the current left limit ray and right limit ray of the zero field of view respectively; the intersection points of the rays A2-1, B2-1, C2-1 and D2-1 with the coupling surface are A2, B2, C2 and D2 respectively. The A2D2 area (indicates the area on the coupling surface between the point labeled A2 and the point labeled D2 in the figure, and the meanings of other areas are analogous) is the total area of ​​the light with zero field of view emitted by the optical machine on the coupling surface, and the B2C2 area is the effective area of ​​the light with zero field of view emitted by the optical machine on the coupling surface; the A2B2 area and the C2D2 area are invalid areas, wherein the light with zero field of view emitted by the optical machine in the C2D2 area will not be reflected by the reflection surface, and cannot propagate forward in the waveguide at the angle required by the current effective range of the field of view; the light with zero field of view emitted by the optical machine in the A2B2 area will be totally reflected by the reflection surface, and propagate forward in the waveguide at an angle outside the angle required by the current effective range of the field of view, thereby forming a ghost image. Therefore, for the light with zero field of view, light in the A2B2 area should be avoided, that is, the light with zero field of view emitted by the optical machine should be avoided from entering the A2B2 area, which requires that the limit point of the endpoint of the optical machine exit pupil surface away from the side of the dichroic film is point B2.

[0005] Figure 3 exist Figure 2 On the basis of the left extreme field of view, the light of the right extreme field of view is added (for example, assuming that the field of view angle range of the pupil expansion direction in the waveguide is -10° to 10°, the left extreme field of view represents the -10° field of view, and the right extreme field of view represents the 10° field of view) to illustrate the position of the end point of the exit pupil surface of the time machine for eliminating ghost images. At this time, the exit pupil surface 11 of the optical machine 1 is located on the coupling surface. Figure 3In the figure, B1-1 and C1-1 are the two light rays of the left extreme field of view emitted by the optical machine, and their intersection points with the coupling surface are B1 and C1 respectively, and the B1C1 region is the effective region of the light of the left extreme field of view on the coupling surface, that is, it should be understood that B1-1 and C1-1 are the light rays at the two end points of the effective region of the light of the left extreme field of view on the coupling surface, which are far from the dichroic film and close to the dichroic film; B3-1 and C3-1 are the two light rays of the right extreme field of view emitted by the optical machine, and their intersection points with the coupling surface are B3 and C3 respectively, and the B3C3 region is the effective region of the light of the right extreme field of view on the coupling surface, similarly, it should be understood that B3-1 and C3-1 are the light rays at the two end points of the effective region of the light of the right extreme field of view on the coupling surface, which are far from the dichroic film and close to the dichroic film. In order to avoid the appearance of ghost images, the limit point of the end point of the optical machine exit pupil surface 11 away from the dichroic film should be set as point B3, and the end point of the optical machine exit pupil surface 11 close to the dichroic film should be on the right side of point C3. At this time, the light of the left extreme field of view can be coupled into the waveguide in the range of B3C1, the light of the 0 field of view can be coupled into the waveguide in the range of B3C2, and the light of the right extreme field of view can be coupled into the waveguide in the range of B3C3. In this case, the amount of light emitted by the optical machine coupled into the waveguide is greatly reduced, resulting in a reduction in imaging brightness; at the same time, due to the large difference in the effective area of ​​the light of each field of view on the coupling surface, the imaging uniformity is poor and black stripes are easily generated. Summary of the invention

[0006] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0007] Another object of the present invention is to provide a method for eliminating ghost images of reflectively coupled AR optical modules, which can eliminate ghost images while ensuring that the amount of light from each field of view emitted by the optical machine and coupled into the waveguide does not decrease significantly, thereby improving imaging uniformity.

[0008] To achieve the above purpose and some other purposes, the present invention adopts the following technical solutions:

[0009] A method for eliminating ghost images of a reflective coupled AR optical module comprises setting an optical machine exit pupil surface on a side of a coupling surface of a waveguide plate away from the optical machine, and determining the position of the optical machine exit pupil surface comprises the following steps:

[0010] Step 1: Determine the effective area corresponding to the light of N fields of view emitted by the optical machine on the coupling surface;

[0011] Step 2: Extend the coupled light at the end point of the corresponding effective area of ​​each field of view away from the dichroic film;

[0012] Step 3: Set the optical machine exit pupil plane to the position where the extended coupled light of all N fields of view is most concentrated;

[0013] Step 4: Set the point closest to the diaphragm among the intersections of the extended coupled light rays of all N fields of view and the plane where the optical machine exit pupil surface is located as the endpoint of the optical machine exit pupil surface away from the diaphragm.

[0014] Preferably, in step 1, the AR optical module is divided into N fields of view according to its field of view range.

[0015] Preferably, in step 3, the optical machine is modeled, and the positions where the extended coupled light rays of all N fields of view are most concentrated are determined by simulation.

[0016] Preferably, the optical machine exit pupil plane is parallel to the total reflection plane of the waveguide plate.

[0017] Preferably, the endpoint of the optical machine exit pupil surface close to the dichroic film is determined by the exit pupil size of the optical machine and the endpoint of the optical machine exit pupil surface away from the dichroic film, that is, the endpoint of the optical machine away from the dichroic film becomes the endpoint of the optical machine close to the dichroic film after moving the exit pupil size toward the dichroic film.

[0018] Another object of the present invention is to provide an AR optical module, which is a reflective coupling AR optical module, comprising an optical machine and a waveguide plate, wherein a total reflection surface of the waveguide plate close to the optical machine is a coupling surface, and the optical machine exit pupil surface is arranged on a side of the coupling surface of the waveguide plate away from the optical machine, and the determination of the position of the optical machine exit pupil surface comprises the following steps:

[0019] Step 1: Determine the effective area corresponding to the light of N fields of view emitted by the optical machine on the coupling surface;

[0020] Step 2: Extend the coupled light at the end point of the corresponding effective area of ​​each field of view away from the dichroic film;

[0021] Step 3: Set the optical machine exit pupil plane to the position where the extended coupled light of all N fields of view is most concentrated;

[0022] Step 4: Set the point closest to the diaphragm among the intersections of the extended coupled light rays of all N fields of view and the plane where the optical machine exit pupil surface is located as the endpoint of the optical machine exit pupil surface away from the diaphragm.

[0023] Preferably, in step 1, the AR optical module is divided into N fields of view according to its field of view range.

[0024] Preferably, in step 3, the optical machine is modeled, and the positions where the extended coupled light rays of all N fields of view are most concentrated are determined by simulation.

[0025] Preferably, the optical machine exit pupil plane is parallel to the total reflection plane of the waveguide plate.

[0026] Preferably, the reflective coupling AR optical module further comprises a reflective surface, which is arranged inside the waveguide plate or at one end of the waveguide plate and forms a set angle with the total reflection surface of the waveguide plate.

[0027] Preferably, the prismatic films are provided in a group, and each prismatic film is arranged parallel to the reflecting surface.

[0028] Preferably, the endpoint of the optical machine exit pupil surface close to the dichroic film is determined by the exit pupil size of the optical machine and the endpoint of the optical machine exit pupil surface away from the dichroic film, that is, the endpoint of the optical machine away from the dichroic film becomes the endpoint of the optical machine close to the dichroic film after moving the exit pupil size toward the dichroic film.

[0029] Another object of the present invention is to provide an AR device, which adopts the method for eliminating ghost images of a reflective coupling AR optical module, or includes the reflective coupling AR optical module.

[0030] The present invention has at least the following beneficial effects:

[0031] The method for eliminating ghost images of reflectively coupled AR optical modules, the AR optical modules and the AR equipment of the present invention can allow as much effective light as possible to enter the waveguide while filtering out the entry of stray light by adjusting the position of the optical machine exit pupil plane and adopting a new method to adjust the position of the end point on the side of the optical machine exit pupil plane away from the dichroic film. Therefore, ghost image generation can be avoided while ensuring image brightness and pattern uniformity.

[0032] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a typical structural diagram of a reflective coupling AR optical module;

[0034] Figure 2 It is for Figure 1 The reflective coupling AR optical module shown in the figure takes the light with zero field of view as an example to illustrate the position of the left end point of the exit pupil surface of the time machine for eliminating ghost images;

[0035] Figure 3 is Figure 2 On the basis of the above, the light of the left extreme field of view and the light of the right extreme field of view are added to illustrate the position of the left end point of the exit pupil surface of the time machine for eliminating ghost images;

[0036] Figure 4 It is a method for eliminating ghost images of a reflective coupled AR optical module according to the present invention or a schematic diagram of the position of an optical-mechanical exit pupil surface of an AR optical module;

[0037] Figure 5 It is a schematic diagram of the end point of the optical machine exit pupil surface far away from the dichroic film according to the method for eliminating ghost images of the reflective coupling AR optical module of the present invention or the AR optical module;

[0038] Figure 6 A schematic diagram of the optical machine exit pupil position determined according to the effective area on the coupling surface of the light of the left extreme field of view, the light of the zero field of view, and the light of the right extreme field of view of the AR optical module of the present invention. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with the accompanying drawings so that a person of ordinary skill in the art can implement it after reading this specification. It should be noted that the optical machine field of view in the AR optical module is a rectangular field of view, and the corresponding optical machine exit pupil surface is also rectangular. Therefore, the two mutually perpendicular sides of the optical machine exit pupil surface can be recorded as the x direction and y direction of the optical machine exit pupil surface, respectively. In this application, the x direction of the optical machine exit pupil surface is recorded as the direction parallel to the paper surface, and the y direction is recorded as the direction perpendicular to the paper surface; at the same time, in this application, for the convenience of description and understanding, the AR optical module is projected along the y direction of the optical machine exit pupil surface to a plane (referred to as the "projection surface") that is perpendicular to the total reflection surface of the waveguide plate and the dichroic film at the same time, and the technical solution is explained by projection. Those skilled in the art should understand that the projection of the optical machine exit pupil surface on the projection plane is a line segment parallel to its x-direction (referred to as the exit pupil surface projection line for short); the two sides of the optical machine exit pupil surface perpendicular to its x-direction, regardless of their length, their projection on the projection plane is the two endpoints of the exit pupil surface projection line.

[0040] It is to be noted again that all descriptions and drawings in this application are explained based on the projection of the AR optical module on the projection surface.

[0041] Example 1

[0042] A method for eliminating ghost images of a reflective coupled AR optical module comprises setting an optical machine exit pupil surface on a side of a coupling surface of a waveguide plate away from the optical machine, and determining the position of the optical machine exit pupil surface comprises the following steps:

[0043] Step 1: Determine the effective area corresponding to the light of N fields of view emitted by the optical machine on the coupling surface;

[0044] Step 2: Extend the coupled light at the end point of the corresponding effective area of ​​each field of view away from the dichroic film;

[0045] Step 3: Set the optical machine exit pupil plane to the position where the extended coupled light of all N fields of view is most concentrated;

[0046] Step 4: Set the point closest to the diaphragm among the intersections of the extended coupled light rays of all N fields of view and the plane where the optical machine exit pupil surface is located as the endpoint of the optical machine exit pupil surface away from the diaphragm.

[0047] In the above solution, in step 1, the AR optical module is divided into N fields of view according to its field of view.

[0048] In the above scheme, in step 3, the optical machine is modeled, and the position where the extended coupled light rays of all N fields of view are most concentrated is determined through simulation.

[0049] In a preferred embodiment, the optical machine exit pupil plane is parallel to the total reflection plane of the waveguide plate.

[0050] In a preferred solution, the end point of the optical machine exit pupil surface close to the bezel is determined by the optical machine exit pupil size and the end point of the optical machine exit pupil surface away from the bezel, that is, the end point of the optical machine away from the bezel moves toward the bezel by the exit pupil size to become the end point of the optical machine close to the bezel. It should be noted that the exit pupil size here refers to the size of the optical machine exit pupil surface in the x direction.

[0051] An AR optical module is a reflective coupling AR optical module, comprising an optical machine and a waveguide plate, wherein a total reflection surface of the waveguide plate close to the optical machine is a coupling surface, and an optical machine exit pupil surface is arranged on a side of the coupling surface of the waveguide plate away from the optical machine, and determining the position of the optical machine exit pupil surface comprises the following steps:

[0052] Step 1: Determine the effective area corresponding to the light of N fields of view emitted by the optical machine on the coupling surface;

[0053] Step 2: Extend the coupled light at the end point of the corresponding effective area of ​​each field of view away from the dichroic film;

[0054] Step 3: Set the optical machine exit pupil plane to the position where the extended coupled light of all N fields of view is most concentrated;

[0055] Step 4: Set the point closest to the diaphragm among the intersections of the extended coupled light rays of all N fields of view and the plane where the optical machine exit pupil surface is located as the endpoint of the optical machine exit pupil surface away from the diaphragm.

[0056] In the above solution, in step 1, the AR optical module is divided into N fields of view according to its field of view.

[0057] In the above scheme, in step 3, the optical machine is modeled, and the position where the extended coupled light rays of all N fields of view are most concentrated is determined by simulation. In a preferred scheme, the modeling and simulation are performed by optical software such as Zemax or CodeV, or programming software such as Matlab.

[0058] In a preferred embodiment, the optical machine exit pupil plane is parallel to the total reflection plane of the waveguide plate.

[0059] In a preferred embodiment, the reflective coupling AR optical module further includes a reflective surface, which is disposed inside the waveguide plate or at one end of the waveguide plate and forms a set angle with the total reflection surface of the waveguide plate.

[0060] In a preferred embodiment, the prismatic films are provided in a group, and each prismatic film is arranged parallel to the reflective surface.

[0061] In a preferred solution, the end point of the optical machine exit pupil surface close to the bezel is determined by the optical machine exit pupil size and the end point of the optical machine exit pupil surface away from the bezel, that is, the end point of the optical machine away from the bezel moves toward the bezel by the exit pupil size to become the end point of the optical machine close to the bezel. It should be noted that the exit pupil size here refers to the size of the optical machine exit pupil surface in the x direction.

[0062] In step 1, first determine the effective area corresponding to the light of the N fields of view emitted by the optical machine on the coupling surface. Specifically, according to the field of view of the AR optical module, it is divided into N fields of view, and the value range of N is 7 to 15. In this embodiment, it is preferred that the value of N is 11, such as Figure 3 As shown, the light of the left extreme field of view (B1-1 and C1-1), the light of the 0 field of view (B2-1 and C2-1), and the light of the right extreme field of view (B3-1 and C3-1) emitted by the optical machine are shown in the figure as examples. The effective area of ​​the light of the left extreme field of view on the coupling surface is B1C1, the effective area of ​​the light of the 0 field of view on the coupling surface is B2C2, and the effective area of ​​the light of the right extreme field of view on the coupling surface is B3C3; the effective area of ​​the light of other fields of view on the coupling surface is not shown, but it should be understood that the effective area of ​​the light of all other fields of view on the coupling surface, its end point away from the side of the splitter film is located between B1 and B3, and the end point close to the side of the splitter film is located between C1 and C3.

[0063] In step 2, the coupled light of each field of view at the end point of the corresponding effective area on the side away from the dichroic film is extended. Specifically, Figure 4As shown, the light of the left extreme field of view (B1-1 and C1-1), the light of the 0 field of view (B2-1 and C2-1), and the light of the right extreme field of view (B3-1 and C3-1) emitted by the optical machine are still taken as examples. For the light in the left extreme field of view, its effective area is B1C1, and the endpoint of the effective area B1C1 on the side away from the spectroscopic film is B1. The coupled light of the light B1-1 of the left extreme field of view at B1 is extended to obtain B1-2; similarly, for the light in the 0 field of view, its effective area is B2C2, and the endpoint of the effective area B2C2 on the side away from the spectroscopic film is B2. The coupled light of the light B2-1 of the 0 field of view at B2 is extended to obtain B2-2; for the light in the right extreme field of view, its effective area is B3C3, and the endpoint of the effective area B3C3 on the side away from the spectroscopic film is B3. The coupled light of the light B3-1 of the right extreme field of view at B3 is extended to obtain B3-2; for the light in other fields of view, similarly, find the endpoint of the corresponding effective area on the side away from the spectroscopic film, and extend the coupled light at the corresponding endpoint.

[0064] It should be noted that the larger the value of N is, the more accurate the position of the optical machine exit pupil surface is.

[0065] In step 3, the optical machine exit pupil plane is set to be located at the position where the extended coupled light of all N fields of view is most concentrated. Specifically, Figure 4 As shown, the light of the left extreme field of view (B1-1 and C1-1), the light of the 0 field of view (B2-1 and C2-1), and the light of the right extreme field of view (B3-1 and C3-1) emitted by the optical machine are still taken as examples in the figure. The extended coupled light of the light of the left extreme field of view is B1-2, the extended coupled light of the light of the 0 field of view is B2-2, and the extended coupled light of the light of the right extreme field of view is B3-2. The exit pupil plane 11 of the optical machine is set at the position where the extended coupled light of B1-2, B2-2, B3-2 and the lights of other fields are most concentrated. The exit pupil plane 11 of the optical machine is parallel to the total reflection surface of the waveguide. It should be understood that the exit pupil plane 11 of the optical machine is not set at this time. Figure 3 The position shown, that is, it is not arranged on the coupling surface of the waveguide plate, but is arranged on the side of the coupling surface of the waveguide plate away from the optical machine. It can also be understood that the exit pupil plane 11 of the optical machine is arranged below the coupling surface (with the extension direction of the light of 0 field of view emitted by the optical machine as the direction).

[0066] In step 3, modeling and simulation can be performed through optical software such as Zemax or CodeV, or programming software such as Matlab, to determine the most concentrated position of the extended coupled light of all N fields of view.

[0067] In step 4, the point closest to the diaphragm among the intersections of the extended coupled light rays of all N fields of view and the plane where the optical machine exit pupil plane is located is set as the end point of the optical machine exit pupil plane away from the diaphragm. Figure 5 As mentioned above, Figure 4 The portion in the dotted box labeled E is enlarged and shown, taking the extended coupling light of the left extreme field of view light B1-1 at the B1 endpoint, the extended coupling light of the 0 field of view light B2-1 at the B2 endpoint, and the extended coupling light of the right extreme field of view light B3-1 at the B3 endpoint as examples. For all the fields of view, including the light of the left extreme field of view, the light of the 0 field of view, and the light of the right extreme field of view, among the intersections of the extended coupling light at the endpoint of the corresponding effective area away from the dichroic film and the plane where the exit pupil of the optical machine is located, point Q is the point closest to the dichroic film, and Q is selected as the endpoint of the exit pupil of the optical machine away from the dichroic film.

[0068] Therefore, after the above steps 1 to 4, the upper and lower positions and the left limit position of the optical machine exit pupil surface can be determined. The determined optical machine exit pupil surface can effectively eliminate the ghost image of the reflective coupling AR optical module, and at the same time can ensure the uniformity of the image brightness and pattern. Specifically, Figure 6 As shown, the light of the left extreme field of view, the light of the 0 field of view, and the light of the right extreme field of view are still used as examples for illustration. Through point Q, three straight lines are drawn parallel to B1-1, B2-1, and B3-1, respectively. The intersection points of the three straight lines with the coupling surface are B11, B21, and B31, respectively. At this time, the area on the coupling surface of the light that can enter the waveguide in the left extreme field of view is B11C1, the area on the coupling surface of the light that can enter the waveguide in the 0 field of view is B21C1, and the area on the coupling surface of the light that can enter the waveguide in the right extreme field of view is B31C1; and because point Q is on the optical machine exit pupil surface, and the optical machine exit pupil surface is the position where the coupled light is most concentrated after the extension of each field of view, therefore, the positions of B11 and B1 are very close, the positions of B21 and B2 are very close, and the positions of B31 and B3 are very close, so it is equivalent to that the light in the effective area on the coupling surface of the left extreme field of view, the 0 field of view, and the right extreme field of view can almost be coupled into the waveguide. Similarly, through the Q point, draw a straight line parallel to the light of any other field of view. The intersection of this straight line and the coupling surface is also very close to the end point of the effective area of ​​the light of this field of view that is far away from the beam splitter film. That is, the light of this field of view in the effective area of ​​the coupling surface can almost be coupled into the waveguide. Therefore, the number of lights of all fields of view emitted by the optical machine coupled into the waveguide will not be significantly reduced, and the uniformity is also very good, that is, the uniformity of image brightness and graphics is guaranteed; at the same time, no stray light will be coupled into the waveguide to form ghost images.

[0069] Example 2

[0070] This embodiment is similar to Embodiment 1, except that, in this embodiment, when in actual application, the endpoint of the optical machine exit pupil surface away from the spectrometer film cannot coincide with the endpoint position determined in step 4, it should be ensured that the endpoint of the optical machine exit pupil surface away from the spectrometer film in actual application is closer to the spectrometer film than the endpoint determined in step 4.

[0071] Example 3

[0072] This embodiment is similar to Embodiment 1, except that, in this embodiment, the coupled light of the N fields of view emitted by the optical machine is extended at the end point of the corresponding effective area on the side close to the dichroic film, and the rightmost point of the intersection of the extended light and the plane where the optical machine exit pupil surface is located is recorded as the right limit point, and the right limit position of the optical machine exit pupil surface is located on the right limit point or on the side of the right limit point close to the dichroic film.

[0073] Example 4

[0074] An AR device, characterized by: adopting the method for eliminating ghost images of a reflective-coupled AR optical module, or comprising the reflective-coupled AR optical module.

[0075] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A method for eliminating ghost images of a reflective coupled AR optical module, characterized in that: The optical machine exit pupil surface is arranged on a side of the coupling surface of the waveguide plate away from the optical machine, and the determination of the position of the optical machine exit pupil surface includes the following steps: Step 1: Determine the effective area corresponding to the light of N fields of view emitted by the optical machine on the coupling surface; Step 2: Extend the coupled light at the end point of the corresponding effective area of ​​each field of view away from the dichroic film; Step 3: Set the optical machine exit pupil plane to the position where the extended coupled light of all N fields of view is most concentrated; Step 4: Set the point closest to the diaphragm among the intersection points of the extended coupled light rays of all N fields of view and the plane where the optical machine exit pupil surface is located as the end point of the optical machine exit pupil surface away from the diaphragm; In step 1, the field of view of the AR optical module is divided into N fields of view according to its field of view range; In step 3, the optical machine is modeled, and the position where the extended coupled light rays of all N fields of view are most concentrated is determined through simulation.

2. The method for eliminating ghost images of a reflective coupled AR optical module according to claim 1, wherein: The optical machine exit pupil plane is parallel to the total reflection plane of the waveguide plate.

3. A reflective coupling AR optical module, comprising an optical machine and a waveguide, wherein a total reflection surface of the waveguide close to the optical machine is a coupling surface, characterized in that: The optical machine exit pupil surface is arranged on a side of the coupling surface of the waveguide plate away from the optical machine, and the determination of the position of the optical machine exit pupil surface comprises the following steps: Step 1: Determine the effective area corresponding to the light of N fields of view emitted by the optical machine on the coupling surface; Step 2: Extend the coupled light at the end point of the corresponding effective area of ​​each field of view away from the dichroic film; Step 3: Set the optical machine exit pupil plane to the position where the extended coupled light of all N fields of view is most concentrated; Step 4: Set the point closest to the diaphragm among the intersection points of the extended coupled light rays of all N fields of view and the plane where the optical machine exit pupil surface is located as the end point of the optical machine exit pupil surface away from the diaphragm; In step 1, the field of view of the AR optical module is divided into N fields of view according to its field of view range; In step 3, the optical machine is modeled, and the position where the extended coupled light rays of all N fields of view are most concentrated is determined through simulation.

4. The reflective in-coupling AR optical module according to claim 3, wherein: It also includes a reflection surface, which is arranged in the waveguide plate or at one end of the waveguide plate and forms a set angle with the total reflection surface of the waveguide plate.

5. The reflective in-coupling AR optical module according to claim 4, wherein: The diaphragm films are arranged in a group, and each diaphragm film is arranged parallel to the reflecting surface.

6. An AR device, characterized in that: The method for eliminating ghost images of a reflective coupling AR optical module as described in any one of claims 1-2 is adopted, or includes the reflective coupling AR optical module as described in any one of claims 3-5.

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