CN115014724B

CN115014724B - System, method and device for testing diffraction light waveguide

Info

Publication number: CN115014724B
Application number: CN202210953198.XA
Authority: CN
Inventors: 孙文强; 金成滨; 韩欣欣; 廖吉仁; 朱建刚; 王敬轩; 石尧中; 董航宇
Original assignee: Goertek Optical Technology Co Ltd
Current assignee: Goertek Optical Technology Co Ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2022-11-22
Anticipated expiration: 2042-08-10
Also published as: CN115014724A

Abstract

Embodiments of the present application provide a system, method and apparatus for testing a diffractive light waveguide. The test system includes: the light source module is used for sequentially projecting a plurality of test images to the light coupling-in area; the pixel areas corresponding to a plurality of test images are different, and each test image is provided with a mark line in at least one direction; the vision module is used for acquiring an imaging image group by adopting the same view field, determining a target imaging image according to the number of the marking lines in at least one direction of each imaging image in the imaging image group, and transmitting the target imaging image to the detection module; imaging images corresponding to the plurality of test images form an imaging image group; the target imaging image is an imaging image which contains the largest number of marking lines in the imaging image group; and the detection module determines the angular resolution of the diffraction optical waveguide in at least one direction according to the width of a group of marking lines in at least one direction in the target imaging image.

Description

System, method and device for testing diffraction light waveguide

Technical Field

The embodiments of the present application relate to the field of diffractive light waveguide technology, and more particularly, to a system, method and apparatus for testing a diffractive light waveguide.

Background

The augmented display technology is a technology for projecting a virtual image to the real world to enhance the perception effect of a user, and has important applications in various fields. In the enhanced display technology, a diffractive optical waveguide is a key element, and the function of the diffractive optical waveguide is to transmit and project a virtual head portrait to the eyes of a user to form a virtual image. The basic function of the diffraction optical waveguide is to realize low-loss and low-distortion transmission of light waves, and the optical performance of the diffraction optical waveguide is an index for detecting the transmission performance of the diffraction optical waveguide.

When the angle resolution of the diffraction light waveguide is detected, a simple test system and a simple test method for detecting the angle resolution of the diffraction light waveguide do not exist at present. In the prior art, a test system is complex, and a test method is complicated, so that the detection of a diffraction optical waveguide by a user is not facilitated.

Disclosure of Invention

The present application is directed to new solutions for a system, method and apparatus for testing a diffractive light waveguide.

In a first aspect, the present application provides a test system that diffracts a light guide. The diffractive light waveguide comprises a light in-coupling area and a light out-coupling area, and the test system comprises:

the light source module is used for sequentially projecting a plurality of test images to the light coupling-in area;

the pixel areas corresponding to a plurality of test images are different, and each test image is provided with a mark line in at least one direction;

the visual module is used for acquiring an imaging image group by adopting the same visual field, determining a target imaging image according to the number of the marking lines in at least one direction of a plurality of imaging images in the imaging image group, and transmitting the target imaging image to the detection module;

imaging images corresponding to the plurality of test images form the imaging image group; the imaging image is an image obtained through the optical waveguide transmission; the target imaging image is an imaging image which contains the largest number of marking lines in the imaging image group;

and the detection module is used for determining the angular resolution of the diffraction optical waveguide in at least one direction according to the width of a group of mark lines in at least one direction in the target imaging image.

Optionally, the marking line of the test image comprises a first line segment and a second line segment, the first line segment and the second line segment extending in the same direction;

wherein the first line segment has a first reflectivity and the second line segment has a second reflectivity, wherein the first reflectivity and the second reflectivity are different.

Optionally, the number of the marking lines in at least one direction corresponding to each of the imaging images is determined based on the gray value of each of the imaging images acquired by the vision module.

Optionally, the at least one directional marking line comprises a horizontal marking line and a vertical marking line; wherein the horizontal angular resolution of the diffractive optical waveguide is determined according to the marking lines in the horizontal direction, and the vertical angular resolution of the diffractive optical waveguide is determined according to the marking lines in the vertical direction.

Optionally, the light source module comprises an illumination light source and a collimating lens group, and the test image is located between the illumination light source and the collimating lens group;

the collimating lens group corresponds to the light coupling-in area to sequentially project a plurality of test images to the light coupling-in area.

Optionally, the test system includes a position adjusting assembly, and the position adjusting assembly drives the vision module to move so as to adjust an acquisition position of the vision module;

the vision module acquires a plurality of groups of imaging image groups to determine a target imaging image group, wherein a plurality of target imaging images form the target imaging image group;

and the detection module determines the angular resolution of at least one direction corresponding to the diffraction light waveguide at different test positions according to the received target imaging image group.

Optionally, the position adjustment assembly comprises a first position adjustment assembly for adjusting the position of the vision module in a first direction and a third direction to determine the angular resolution of the diffractive optical waveguide in at least one direction over a different range of eye motion;

wherein the first direction is a direction parallel to an extending direction of the diffractive optical waveguide, and the third direction is a direction perpendicular to the extending direction of the diffractive optical waveguide.

Optionally, the position adjustment assembly comprises a second position adjustment assembly for adjusting the position of the vision module in a second direction to determine the angular resolution of the diffractive optical waveguide in at least one direction at different exit pupil distances.

Optionally, the test system includes a first position adjustment assembly for adjusting the position of the vision module in the first direction and the third direction to determine the angular resolution of the diffractive optical waveguide in at least one direction in different eye movement ranges, and comparing the deviation of the angular resolution of the diffractive optical waveguide in at least one direction in different eye movement ranges.

Optionally, the test image comprises at least two sets of marking lines in one of the directions, the width of the two sets of marking lines being the same.

In a second aspect, a method of testing a diffractive optical waveguide is provided. A diffractive light waveguide comprising a light incoupling region and a light outcoupling region, said method comprising:

sequentially projecting a plurality of test images to the light incoupling region; the pixel areas corresponding to a plurality of test images are different, and each test image is provided with a mark line in at least one direction;

acquiring an imaging image group by adopting the same view field, and determining a target imaging image according to the number of marking lines in at least one direction in each imaging image so as to transmit the target imaging image to a detection module;

imaging images corresponding to the plurality of test images form the imaging image group; the target imaging image is an imaging image which contains the largest number of marking lines in the imaging image group;

the angular resolution of at least one direction of the diffractive optical waveguide is determined based on a set of marker line widths in the target imaged image.

In a third aspect, a test apparatus is provided that diffracts light into a waveguide. The diffractive light waveguide includes a light-in area and a light-out area, and the test apparatus includes:

a control module sequentially projecting a plurality of test images to the light coupling-in area; the areas of pixels corresponding to a plurality of test images are different, and each test image is provided with a mark line in at least one direction;

the acquisition module is used for acquiring an imaging image group by adopting the same view field, determining a target imaging image according to the number of marking lines in at least one direction in each imaging image and transmitting the target imaging image to the detection module; imaging images corresponding to the plurality of test images form the imaging image group; the target imaging image is an imaging image which contains the largest number of marking lines in the imaging image group;

and the detection module is used for determining the angular resolution of at least one direction of the diffraction optical waveguide according to the width of a group of marking lines in the target imaging image.

In the technical scheme provided by the embodiment of the application, the light source module is controlled to project a plurality of test images to the diffraction light guide, wherein each test image corresponds to different pixel areas, so that the plurality of test images projected to the diffraction light guide are test images with different pixel sizes. After a plurality of test images are projected to the diffraction light waveguide in sequence, the vision module can acquire an imaging image group by adopting the same view field. Since the plurality of test images have different pixel sizes, the number of marking lines in at least one direction of different imaging images acquired by the vision module on the same field of view is different. Therefore, according to the number of the marking lines in at least one direction of each imaging image, the target imaging image is determined, and the target imaging image is transmitted to the detection module.

In the embodiment of the application, the detection module can obtain the angular resolution of at least one direction of the diffraction light waveguide according to the width of a group of mark lines in a received target imaging image. Therefore, the test system of the embodiment of the application can meet the aim of testing the angular resolution of the diffraction optical waveguide in at least one direction, and the test method is simple and convenient for user operation.

Other features of the present description and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.

Fig. 1 is a first structural diagram of a diffractive optical waveguide test system according to an embodiment of the present disclosure.

Fig. 2 is a second structural diagram of a diffractive optical waveguide test system according to an embodiment of the present application.

Fig. 3 is a schematic diagram showing the corresponding imaged images in the same field of view.

Fig. 4 is a schematic flowchart illustrating a testing method for a diffractive optical waveguide according to an embodiment of the present application.

Fig. 5 is a schematic hardware configuration diagram of a testing apparatus for a diffractive optical waveguide according to an embodiment of the present application.

Description of the reference numerals:

1. a diffractive optical waveguide; 10. an optical waveguide body; 11. a light coupling-in region; 12. a light coupling-out region;

2. testing the image; 21. marking a line; 211. a first line segment; 212. a second line segment;

3. a light source module; 31. an illumination light source; 32. a collimating lens group;

4. a vision module;

1200. a testing device; 1201. a control module; 1202. acquiring a module; 1203. a detection module.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

The AR optical display system is composed of a micro display screen and an optical element assembly. Common optical elements are prisms, free-form surfaces, diffractive optical waveguides 1, etc. Among these optical elements, the diffractive optical waveguide 1 includes a transmissive diffractive optical waveguide and a reflective diffractive optical waveguide, wherein the test system for a diffractive optical waveguide provided in the embodiments of the present application can be applied to a transmissive diffractive optical waveguide and a reflective diffractive optical waveguide.

The diffractive optical waveguide 1 comprises an optical waveguide body 10, a light coupling-in area 11 and a light coupling-out area 12, wherein the light coupling-in area 11 and the light coupling-out area 12 are located on the optical waveguide body 10, incident light enters the diffractive optical waveguide 1 from the light coupling-in area 11, and exits from the light coupling-out area 12 through transmission of the diffractive optical waveguide 1, and an angular resolution (PPD, pixels Per depth) of the diffractive optical waveguide 1 represents a minimum target or a minimum angle capable of being displayed by the AR optical display system, and is one of the most critical indexes of the AR optical display system. The angular resolution (PPD, pixels Per depth) thus determines the image resolving power of the AR optical display system. Based on this, the quality of the diffractive optical waveguide 1 can be detected by testing the angular resolution of the diffractive optical waveguide 1.

In the prior art, when the angle resolution of the diffractive light waveguide is detected, a simple test system and a simple test method for detecting the angle resolution of the diffractive light waveguide do not exist at present.

In order to solve the above problems, the embodiment of the present disclosure provides a system, a method, and a device for testing a diffractive light guide, where a plurality of test images 2 with different pixel sizes are projected to a diffractive light guide 1 by controlling a light source module 3, and the angular resolution of the diffractive light guide 1 is detected by the test system.

Various embodiments and examples according to the present disclosure are described below with reference to the drawings.

< System embodiment >

Referring to fig. 1 and 2, embodiments of the present disclosure provide a test system for diffracting a light guide. The system is used for detecting the angular resolution (PPD) of the diffraction optical waveguide 1, for example, the Horizontal angular resolution (HPPD) and the Vertical angular resolution (VPPD) of the diffraction optical waveguide 1 can be detected. The test system for the diffraction optical waveguide provided by the embodiment of the application can be applied to a transmission type diffraction optical waveguide and a reflection type diffraction optical waveguide. Referring to fig. 1, a schematic diagram of a test system applied to a reflective diffractive optical waveguide is shown, and referring to fig. 2, a schematic diagram of a test system applied to a transmissive diffractive optical waveguide is shown.

As shown in fig. 1 and 2, the testing system for diffractive optical waveguide according to the embodiment of the present disclosure may include a light source module 3, a vision module 4, and a detection module (not shown in the drawings).

The light source module 3 is used for sequentially projecting a plurality of test images 2 to the light coupling-in area 11;

the pixel areas corresponding to a plurality of test images 2 are different, and each test image 2 has at least one marking line 21 in one direction.

The visual module 4 is used for acquiring an imaging image group by adopting the same visual field, determining a target imaging image according to the number of the marking lines 21 in at least one direction of each imaging image in the imaging image group, and transmitting the target imaging image to the detection module;

the imaging image corresponding to each test image 2 forms the imaging image group; the imaging image is an image obtained through the optical waveguide transmission; the target imaging image is an imaging image in which the imaging image group contains the largest number of marking lines 21;

wherein the detection module is configured to determine the angular resolution of the diffractive optical waveguide 1 in at least one direction according to the width of a set of mark lines 21 in at least one direction in the target imaging image.

In this embodiment, the light source module 3 can sequentially project a plurality of test images 2 onto the light coupling-in area 11. For example, the light source module 3 is disposed corresponding to the light coupling-in area 11, and the light source module 3 irradiates the test image 2 and projects the test image 2 to the light coupling-in area 11. In the present embodiment, the light source module 3 irradiates the plurality of test images 2, and sequentially projects the plurality of test images 2 to the light coupling region 11. The sequence of the light source module 3 projecting the plurality of test images 2 onto the light coupling-in area 11 in sequence is not limited, as long as the plurality of test images 2 with different pixel areas can be projected onto the light coupling-in area 11.

In this embodiment, the plurality of test images 2 correspond to different pixel areas, and therefore any two test images 2 correspond to pixel areas that are not the same, i.e., the plurality of test images 2 are test images 2 of different pixel sizes.

Where a "pixel" is an element consisting of a small square of the image. "pixel area" is the area of each pixel (pixel unit); the "number of pixels" is the number of small squares in the test image 2, wherein in the area of the test image 2 as a unit area, a larger number of pixels means a smaller area per pixel unit. Wherein the number of pixels may be the same and the area of the pixels different in the two test images 2, or the number of pixels may be different and the area of the pixels different in the two test images 2.

The "pixel" may include a pixel in a horizontal direction, and may also include a pixel in a vertical direction. Referring to fig. 3, each of fig. 3a and 3b includes pixels in a horizontal direction and pixels in a vertical direction, wherein the number of pixels (total number of pixels) of the image shown in fig. 3a is greater than the number of pixels (total number of pixels) of the image shown in fig. 3 b. The pixel area of the image shown in fig. 3a is smaller than the pixel area of the image shown in fig. 3 b.

In this embodiment, each test image 2 has at least one direction of the marking line 21. For example, the test image 2 is a black and white checkerboard, and the marking lines 21 are lines connecting black and white lattices. Or the test image 2 is an image with hollowed-out spaces, wherein the mark line 21 is a line connecting the hollowed-out lattices and the hollowed-out lattices. Or the test image 2 is a grid image of two different colors. Referring to fig. 3, in fig. 3a, the horizontal direction mark line 21 connecting the black lattice and the white lattice is included, and the vertical direction mark line 21 connecting the white lattice and the black lattice is also included.

Wherein the pixel area and the number of the marking lines 21 have a corresponding relationship, wherein the more the number of pixels of the test image 2 is, the more the number of the corresponding pixel units is, the smaller the pixel area is, and the more the marking lines 21 connecting the adjacent pixel units are, when the area (physical area) of the test image 2 is the same. At this time, when the vision module 4 acquires the imaged image of the test image 2 having different original pixel areas using the same field of view, the imaged image is finally displayed in the vision module 4, and the number of the pixel units of the imaged image and the number of the calibration lines are also different. Where "the number of the marker lines 21" is the sum of the marker lines 21 included in the imaged image in one direction.

Or under the condition that the areas of the test images 2 are different, because the pixel areas in the test images 2 are different, when the vision module 4 acquires the imaging images corresponding to the test images 2 with different pixel numbers originally by using the same field of view, the number of the pixel units of the imaging images finally displayed in the vision module 4 and the number of the calibration lines are also different.

Specifically, referring to fig. 3, the "black circular line" corresponds to the field of view, and the perimeter and area of the black circular line are the same in fig. 3a and 3b, i.e., it is characterized that fig. 3a and 3b correspond to the same field of view. Since the pixel areas of fig. 3a and 3b are different from each other, the number of pixel cells surrounded by the black circular lines and the number of calibration lines in fig. 3a are different from those in fig. 3 b. That is, in fig. 3a, the number of pixel cells and the number of calibration lines surrounded by the black circular lines are greater than those in fig. 3 b.

In this embodiment, the vision module 4 obtains an imaging image group in the same field of view, wherein the plurality of test images 2 correspond to different imaging images, and the different imaging images form the imaging image group.

Specifically, since the areas of the corresponding pixels in the plurality of test images 2 are different, when the imaging images are acquired in the same field of view, the display areas (i.e., the physical areas of the imaging images) of the different imaging images displayed by the vision module 4 are the same, but the number of pixels and the number of marking lines 21 (lines connecting two adjacent pixels) present in the imaging images are different. In one embodiment, the vision module 4 may be a vision camera.

Since the number of pixels presented in different imaged images and the number of the mark lines 21 in at least one direction are different, it is determined that the imaged image including the largest number of mark lines 21 is the target imaged image according to the number of the mark lines 21 in at least one direction. The target image has the largest number of pixels, the smallest area of pixel units, and the largest number of marking lines 21 in at least one direction, relative to the other images.

Therefore, the vision module 4 in the embodiment of the present application is used for acquiring and displaying the imaging image group, selecting the target imaging image from the imaging image group, and transmitting the target imaging image to the detection module.

In an alternative embodiment, where the plurality of test images 2 are images having the same pattern, or the plurality of test images 2 may also be images having different same patterns, as long as it is possible to ensure that the number of pixels of the plurality of test images 2 is different.

In an alternative embodiment, the detection module and the vision module 4 may be an integral structure, and the detection module and the vision module 4 constitute a machine vision system. Or the detection module and the vision module 4 can be of a split structure.

In this embodiment, the detection module is configured to determine the angular resolution of the diffractive optical waveguide 1 in at least one direction according to the width of the set of mark lines 21 in at least one direction in the target imaging image.

It can be understood that the detection module determines the angular resolution of the diffractive optical waveguide 1 in at least one direction according to the ratio of the width of the mark line 21 in at least one direction in the target imaging image to the corresponding field angle (the field of view for acquiring the imaging image).

For example, the detection module determines the horizontal angle resolution of the diffractive optical waveguide 1 according to the width of a group of mark lines 21 in the target imaging image, wherein the group of mark lines 21 are mark lines 21 in the horizontal direction, and according to the ratio of the width of the group of mark lines 21 in the horizontal direction to the corresponding field angle.

Or the detection module determines the vertical angle resolution of the diffracted light waveguide 1 according to the width of a group of mark lines 21 in the target imaging image, wherein the group of mark lines 21 are mark lines 21 in the vertical direction, and according to the ratio of the width of the group of mark lines 21 in the vertical direction to the corresponding field angle.

According to the embodiment of the application, the light source module 3 is controlled to project a plurality of test images 2 to the diffractive optical waveguide 1, wherein the plurality of test images 2 correspond to different pixel areas, so that the plurality of test images 2 projected to the diffractive optical waveguide 1 are test images 2 with different pixel sizes. After a plurality of test images 2 are projected to the diffractive optical waveguide 1 in sequence, the vision module 4 can acquire an imaging image group with the same view field. Since the plurality of test images 2 have different pixel sizes, the number of marking lines 21 in at least one direction of different imaged images captured by the vision module 4 in the same field of view is different. Therefore, according to the number of the marking lines 21 in at least one direction of each imaging image, the target imaging image is determined, and the target imaging image is transmitted to the detection module.

In the embodiment of the present application, the detection module can obtain the angular resolution of at least one direction of the diffractive light waveguide 1 according to the width of a group of mark lines 21 in the received target imaging image. Therefore, the test system of the embodiment of the application can meet the purpose of measuring the angular resolution of the diffraction optical waveguide 1 in at least one direction, and the test method is simple and convenient for user operation.

In one embodiment, referring to fig. 3, the marking line 21 of the test image 2 includes a first line segment 211 and a second line segment 212, and the first line segment 211 and the second line segment 212 extend in the same direction.

Wherein the first line segment 211 has a first reflectivity and the second line segment 212 has a second reflectivity, wherein the first reflectivity and the second reflectivity are different.

In this embodiment, the group of the mark lines 21 includes a first line segment 211 and a second line segment 212, wherein the first line segment 211 corresponds to one pixel, and the second line segment 212 corresponds to another pixel, and wherein "one pixel" and another pixel "are adjacently disposed in one direction. The mark line 21 is a line connecting two adjacent pixels.

The present embodiment defines that the first line segment 211 and the second line segment 212 in the mark line 21 have different reflectivity, and facilitates the vision module 4 to quickly detect the number of mark lines 21 in at least one direction of the imaging image, so as to finally determine the target imaging image. In a specific embodiment, the first reflectivity of the first line segment 211 may be greater than the second reflectivity of the second line segment 212, or the first reflectivity of the first line segment 211 may be less than the second reflectivity of the second line segment 212.

In one specific embodiment, the test image 2 is a black and white checkerboard in which the metal material is plated in a black pattern and not plated in a white pattern; alternatively, the test image 2 is a black and white checkerboard in which no metal material is plated in a black pattern and metal material is plated in a white pattern.

Or the test image 2 is an image with hollowed lattices, wherein the reflectivity of the hollowed lattices is smaller than that of the unroughened lattices.

In one embodiment, the number of marking lines 21 in at least one direction of each of the imaged images is determined based on the gray value of each of the imaged images acquired by the vision module 4.

In particular, the gray value (intensity profile) of the imaged image characterizes the sharpness of the imaged image. Wherein the vision module 4 detects the number of the marking lines 21 in at least one direction of each imaged image in the case where each imaged image is clear. For example, the vision module 4 may capture the gray values (intensity profiles) of the imaged image and then analyze the number of marking lines 21 of the imaged image within the field of view.

In one embodiment, the at least one direction marking line 21 includes a horizontal direction marking line 21 and a vertical direction marking line 21; wherein the horizontal angular resolution of the diffractive optical waveguide 1 is determined on the basis of the marking lines 21 in the horizontal direction and the vertical angular resolution of the diffractive optical waveguide 1 is determined on the basis of the marking lines 21 in the vertical direction.

In this embodiment the test image 2 has at least one direction of the marking line 21. Referring to fig. 3a and 3b, the test image 2 is a black and white checkerboard image, and each test image 2 includes a horizontal mark line 21 and a vertical mark line 21.

And transmitting the target imaging image to the detection module at the vision module 4, wherein the detection module can simultaneously determine the horizontal angle resolution and the vertical angle resolution of the diffractive optical waveguide 1. The test image 2 includes fig. 3a and 3b, where the imaging image corresponding to fig. 3a is the target imaging image.

Or the test image 2 is a black and white stripe pattern, wherein each stripe extends along the vertical direction, and only the marking lines 21 in the horizontal direction are included in the test image 2. The horizontal angular resolution of the diffractive optical waveguide 1 is determined according to the marking line 21 in the horizontal direction.

Or the test image 2 is a black and white stripe pattern, wherein each stripe extends along the horizontal direction, and only the mark lines 21 in the vertical direction are included in the test image 2. The vertical angular resolution of the diffractive light guide 1 is determined according to the marking lines 21 in the vertical direction.

In one embodiment, referring to fig. 1 and 2, the light source module 3 includes an illumination light source 31 and a collimating lens group 32, and the test image 2 is located between the illumination light source 31 and the collimating lens group 32;

the collimating lens group 32 corresponds to the light incoupling area 11 to sequentially project a plurality of test images 2 to the light incoupling area 11.

Specifically, the light source module 3 includes an illumination light source 31 and a collimating lens group 32. The illumination light source 31 may be a halogen lamp or an LED light source, for example. The collimating lens group 32 includes at least one collimating lens. Wherein for example an illumination source 31 illuminates different test images 2, the illuminated test images 2 are projected collimated into the light incoupling zone 11 by placing a collimating lens group 32.

In a specific embodiment, the illumination source 31 illuminates the test image 2, and the illuminated test image 2 is projected collimated into the light incoupling region 11 by positioning the collimating lens group 32.

Through the transmission of the diffraction light waveguide 1, the test image 2 is emitted from the coupling-out area of the diffraction light waveguide 1, the gray value of an imaging image is collected by using an actual module under the same field of view, and the number of the mark lines 21 of the imaging image in the field of view is analyzed; by replacing the test image 2 with different pixel sizes (different pixel areas) until the maximum number of clear marking lines 21 can be observed in at least one direction in the current field of view, taking the imaged image as the target imaged image, the angular resolution of the diffractive optical waveguide 1 in at least one direction can be determined according to the width of the marking lines 21 in at least one direction of the target imaged image.

In one embodiment, referring to fig. 1 and 2, the testing system includes a position adjusting component, which drives the vision module 4 to move to adjust the obtaining position of the vision module 4;

the vision module 4 acquires a plurality of groups of imaging image groups to determine a target imaging image group, wherein a plurality of target imaging images form the target imaging image group;

and the detection module determines the angular resolution of the diffraction optical waveguide 1 in at least one direction at different test positions according to the received target imaging image group.

In this embodiment, the testing system further comprises a position adjustment assembly, wherein the position adjustment assembly is used for driving the vision module 4 to move. That is, in the present embodiment, the position of the visual module 4 is movable, not fixed, in the light outcoupling region 12 of the diffractive light waveguide 1. For example, referring to fig. 1, the vision module 4 can move in a three-dimensional space (a three-dimensional space formed by an arrow a, an arrow b, and an arrow c).

Since the position of the vision module 4 is movable, i.e. the testing position of the vision module 4 is adjustable. The vision module 4 can acquire imaging images at different positions.

For example, the vision module 4 is disposed on the position adjusting component, at the time T1, the vision module 4 is located at the test position a, the light source module 3 sequentially projects the plurality of test images 2 to the light coupling area 11, and correspondingly, the vision module 4 acquires the first set of imaging image groups. A first target imaging image is determined from the set of acquired imaging images, and at least one azimuthal resolution of the diffractive optical waveguide 1 at the A test position is determined from the target imaging image.

At the moment of T2, the position adjusting assembly drives the vision module 4 to move to the B test position, at the moment, the light source module 3 sequentially projects a plurality of test images 2 to the light coupling area 11, and correspondingly, the vision module 4 obtains a second group of imaging image groups. A second target imaging image is determined from the set of acquired imaging images, and at least one azimuthal resolution of the diffractive optical waveguide 1 at the B-test position is determined from the target imaging image.

Wherein, the first group of imaging image group obtained by the vision module 4 at the A testing position and the second group of imaging image group obtained by the vision module 4 at the B testing position form two groups of imaging image groups. Therefore, when the position adjusting assembly drives the vision module 4 to move, the vision module 4 can acquire a plurality of groups of imaging image groups.

Wherein, the first group of imaging image group obtained by the vision module 4 at the test position A determines a first target imaging image from the imaging image group; the second set of imaging images acquired by the vision module 4 at the test position B determines a second target imaging image from the imaging module. Wherein the first target imaged image and the second target imaged image may form a target imaged image set. In one embodiment, the test images 2 corresponding to the first target imaging image and the second target imaging image may be the same or different.

Of course, the position adjusting assembly can also drive the vision module 4 to move to other positions, and this embodiment is not limited.

In this embodiment, the detection module determines the angular resolution of at least one direction of the diffractive optical waveguide 1 at different test positions according to the received set of target imaging images.

For example, in accordance with the above discussion, the angular resolution of at least one direction of the diffractive optical waveguide 1 at the A test position and the angular resolution of at least one direction of the diffractive optical waveguide 1 at the B test position can be determined.

In a specific embodiment, the vision module 4 obtains a first set of imaging images from the a test position, determines a first target imaging image from the first set of imaging images, and transmits the first target imaging image to the detection module, and the detection module determines the angular resolution of the diffractive optical waveguide 1 in at least one direction in the a test position according to the width of the mark line 21 in at least one direction of the first target imaging image.

Then, the vision module 4 acquires a second group of imaging images at the B test position, a second target imaging image is determined from the second group of imaging images, the second target imaging image is transmitted to the detection module, and the detection module determines the angular resolution of at least one direction of the diffractive optical waveguide 1 at the B test position according to the width of the marking line 21 of at least one direction of the second target imaging image. In this embodiment, therefore, the corresponding target imaging images are respectively transmitted to the detection modules to finally determine the angular resolution of at least one direction of the diffractive light waveguide 1 at different test positions.

Or in another embodiment, the vision module 4 acquires a first set of imaging images at the a test position while moving the vision module 4 to the B test position, and the vision module 4 acquires a second set of imaging images at the B test position. At this time, the vision module 4 determines a first target image and a second target image according to the first imaging image group and the second imaging image group.

And then, simultaneously transmitting the first target imaging image and the second target imaging image to a detection module, wherein the detection module determines the angular resolution of at least one direction of the diffractive optical waveguide 1 at the A test position according to the received target imaging image group, and determines the angular resolution of at least one direction of the diffractive optical waveguide 1 at the B test position. Therefore, in this embodiment, the corresponding sets of target imaging images are simultaneously transmitted to the detection module to finally determine the angular resolution of at least one direction of the diffracted light waveguide 1 at different test positions simultaneously.

In an alternative embodiment, the position adjustment assembly may include a motorized track and a motorized lift table. The motorized guide and the motorized lift stage are combined so that the vision module 4 can move in a three-dimensional space (a three-dimensional space during arrow a, arrow b, and arrow c). In addition, the position adjusting component may be a three-axis adjusting mechanism as long as the position of the vision module 4 can be changed.

In one embodiment, the position adjustment assembly comprises a first position adjustment assembly for adjusting the position of the vision module 4 in the first and third directions to determine the angular resolution of at least one direction of the diffractive optical waveguide 1 over different ranges of eye movement;

wherein the first direction is a direction parallel to the extending direction of the diffractive light waveguide 1, and the third direction is a direction perpendicular to the extending direction of the diffractive light waveguide 1.

In this embodiment, the eye movement range (Eyebox) refers to the pupil being able to obtain complete image information

A movable space. If the pupil is outside the eye movement range, the emergent light cannot enter the eyeball, and the displayed image cannot be observed.

In this embodiment, the test requirements for different Eyebox locations can be met by adjusting the location of the visual camera in two dimensions, arrow a (first direction shown) and arrow c (third direction shown).

Specifically, the first position adjusting assembly moves the vision module 4 to the eye movement range position a, and the vision module 4 acquires an imaging image group A; after the vision module 4 acquires the imaging image group A in the eye movement range a, changing the test position of the vision module 4 to move the vision module 4 to the eye movement range position B, and then acquiring the imaging image group B by the vision module 4; in addition, the visual module 4 can be adjusted to be located at any position of the eye movement range area, so that the visual module 4 can acquire imaging image groups at different eye movement range positions.

The vision module 4 analyzes the number of the mark lines 21 in at least one direction of the imaging image group a and the imaging image group B to determine a target imaging image a and a target imaging image B, and transmits both the target imaging image a and the target imaging image B to the detection module, and the detection module respectively calculates and analyzes the target imaging image a and the target imaging image B to correspondingly calculate the angular resolution in at least one direction of the diffractive optical waveguide 1 at the eye movement range position a and calculate the angular resolution in at least one direction of the diffractive optical waveguide 1 at the eye movement range position B.

In this embodiment, therefore, the angular resolution of at least one direction of the diffractive optical waveguide 1 at different Eyebox positions can be detected by the test system provided by this embodiment.

In an alternative embodiment, the first position adjustment assembly may be a motorized track.

In one embodiment, the position adjustment assembly includes a second position adjustment assembly for adjusting the position of the vision module 4 in a second direction to determine the angular resolution of the diffractive optical waveguide 1 in at least one direction at different exit pupil distances.

In this embodiment, wherein the exit pupil position (Eye relief), the distance of the optical module 4 from the diffractive optical waveguide 1 in the second direction is characterized, wherein the distance of the optical module 4 from the diffractive optical waveguide 1 in the second direction may indirectly correspond to different angles of view.

For example, at the time T1, the second position adjustment component drives the vision module 4 to move in the second direction, the distance between the vision module 4 and the diffractive optical waveguide 1 in the second direction is a, at the time T2, the second position adjustment component drives the vision module 4 to move in the second direction, the distance between the vision module 4 and the diffractive optical waveguide 1 in the second direction is b, where the distance a is smaller than the distance b, at the distance a, the corresponding field angle is β 1, and at the distance b, the corresponding field angle is β 2, and the field angle β 1 is greater than the field angle β 2. Wherein the angle of view is related to the distance from the vision module 4 to the diffractive optical waveguide 1 and the length dimension of the light outcoupling region 12. The angle of view at a location can be determined, for example, by calculating the distance of the vision module 4 from the diffractive optical waveguide 1 and the trigonometric function of the length dimension of the light outcoupling region 12.

In this embodiment, by adjusting the position of the vision module 4 in the one-dimensional space (arrow b (shown in the second direction)), that is, by adjusting the distance between the vision module 4 and the diffractive optical waveguide 1 in the second direction, the test requirements of different eyereliefs can be met.

Specifically, wherein the vision module 4 is located at the exit pupil position a (the distance between the vision module 4 and the diffractive optical waveguide 1 in the second direction is a), at the field angle β 1, the vision module 4 acquires the imaging image group a; after the vision module 4 acquires the imaging image group a at the exit pupil position a, changing the position of the vision module 4 in the second direction to position the vision module 4 at the exit pupil position B (the distance between the vision module 4 and the diffractive optical waveguide 1 in the second direction is B, and the distance a is smaller than the distance B), and then at the field angle β 2, acquiring the imaging image group B by the vision module 4; in addition, the visual module 4 can be adjusted to be located at any position of the exit pupil area, so that the visual module 4 can acquire imaging images at different exit pupil positions.

The vision module 4 analyzes the number of the mark lines 21 in at least one direction of the imaging image group a and the imaging image group B to determine a target imaging image a and a target imaging image B, and transmits both the target imaging image a and the target imaging image B to the detection module, and the detection module respectively calculates and analyzes the target imaging image a and the target imaging image B to correspondingly calculate the angular resolution in at least one direction of the diffractive optical waveguide 1 at the exit pupil position a and calculate the angular resolution in at least one direction of the diffractive optical waveguide 1 at the exit pupil position B.

Thus in this embodiment, the angular resolution of at least one direction of the diffractive optical waveguide 1 at different Eye reliefs can be detected by the test system provided by this embodiment.

In an alternative embodiment, the second position adjustment assembly may be a motorized lift table.

In one embodiment, the testing system includes a first position adjustment assembly for adjusting the position of the vision module 4 in the first and third directions to determine the angular resolution of the diffractive optical waveguide 1 in at least one direction for different eye movement ranges, thereby comparing the deviation in the angular resolution of the diffractive optical waveguide 1 in at least one direction for different eye movement ranges.

In this embodiment, the eye movement range (Eyebox) refers to the pupil capable of acquiring complete image information

Specifically, the first position adjusting assembly moves the vision module 4 to the eye movement range position C, and the vision module 4 acquires an imaging image group C; wherein the eye movement range position c is located at an edge position of the eye movement range.

After the vision module 4 acquires the imaging image group C in the eye movement range C, changing the testing position of the vision module 4 to move the vision module 4 to the eye movement range position D, and then acquiring the imaging image group D by the vision module 4; wherein the eye movement range position d is the center position of the eye movement range. In addition, the visual module 4 can be adjusted to be located at any position of the eye movement range area, so that the visual module 4 can acquire imaging image groups at different eye movement range positions.

The vision module 4 analyzes the number of the marking lines 21 in at least one direction of the imaging image group C and the imaging image group D to determine a target imaging image C and a target imaging image D, and transmits both the target imaging image C and the target imaging image D to the detection module, and the detection module respectively calculates and analyzes the target imaging image C and the target imaging image D to correspondingly calculate the angular resolution in at least one direction of the diffractive optical waveguide 1 at the eye movement range position C and calculate the angular resolution in at least one direction of the diffractive optical waveguide 1 at the eye movement range position D.

The value of the deviation present at the two positions is determined from the angular resolution of at least one direction of the diffractive optical waveguide 1 at the eye movement range position c and the angular resolution of at least one direction of the diffractive optical waveguide 1 at the eye movement range position d to compare the angular resolution at the edge position of the eye movement range (eye movement range position c) with the deviation of the angular resolution at the center position of the eye movement range (eye movement range position d).

It is also possible to adjust the position of the vision module 4 stepwise so that the position of the vision module 4 is gradually closer to the center position of the eye movement range, and to compare the deviation of the angular resolution in at least one direction of the diffractive optical waveguide 1 from the angular resolution in at least one opposite direction of the diffractive optical waveguide 1 in the center position when the non-center position is not the center position.

According to the non-center position, the angular resolution of at least one direction of the diffractive optical waveguide 1 and the deviation value of at least one reverse angular resolution of the diffractive optical waveguide 1 at the center position, so that the eye movement range is adjusted, the deviation of the angular resolution in the eye movement range is reduced, and the experience effect of a user is improved.

Therefore, in this embodiment, by using the test system provided in this embodiment, the deviation of the angular resolution of at least one direction of the diffractive optical waveguide 1 at different Eyebox positions can be detected and compared, so as to adjust the eye movement range, and finally improve the experience effect of the user.

In one embodiment, the test image 2 comprises at least two sets of marking lines 21 in one of the directions, the width of the marking lines 21 of both sets being the same.

The present embodiment defines that the widths of the marking lines 21 included in the same direction are uniform, which is more advantageous for determining the angular resolution of at least one direction.

< method examples >

Referring to fig. 4, an embodiment of the present disclosure further provides a testing method for a diffractive optical waveguide 1, where the diffractive optical waveguide 1 has a light coupling-in area 11 and a light coupling-out area 12, and the method may include: step S101-step S103.

S101: by sequentially projecting a plurality of test images 2 to the light incoupling region 11; wherein, the pixel areas corresponding to a plurality of test images 2 are different, and each test image 2 has a mark line 21 with at least one direction;

s102: acquiring an imaging image group by adopting the same field of view, and determining a target imaging image according to the number of marking lines 21 in at least one direction of each imaging image in the imaging image group so as to transmit the target imaging image to a detection module;

the imaging image corresponding to each test image 2 forms the imaging image group; the target imaging image is an imaging image in which the imaging image group contains the largest number of marking lines 21;

in this step, the vision module 4 corresponds to the light outcoupling region 12 of the diffractive optical waveguide 1, and the vision module 4 can receive and display the imaging image group, determine a target imaging image from the imaging image group, and transmit the target imaging image to the detection module, so that the detection module can detect the target imaging image.

S103: the angular resolution of at least one direction of the diffractive optical waveguide 1 is determined in accordance with the width of the set of marker lines 21 for at least one direction in the target imaged image.

In this step, the detection module may be configured to calculate image information in the target image and determine the angular resolution of the diffractive optical waveguide 1.

In the technical scheme provided by the embodiment of the application, the light source module 3 is controlled to project a plurality of test images 2 to the diffraction optical waveguide 1, wherein each test image 2 corresponds to a pixel area, and therefore the test images 2 projected to the diffraction optical waveguide 1 are test images 2 with different pixel sizes. After a plurality of test images 2 are projected to the diffractive optical waveguide 1 in sequence, the vision module 4 can acquire an imaging image group with the same view field. Since the plurality of test images 2 have different pixel sizes, the number of marking lines 21 in at least one direction of different imaged images captured by the vision module 4 in the same field of view is different. Therefore, according to the number of the marking lines 21 in at least one direction of each imaging image, the target imaging image is determined, and the target imaging image is transmitted to the detection module.

< apparatus embodiment >

In the present embodiment, a testing apparatus for a diffractive optical waveguide 1 is provided, the diffractive optical waveguide 1 has a light coupling-in region 11 and a light coupling-out region 12, as shown in fig. 5, the testing apparatus 1200 for the diffractive optical waveguide 1 may include a control module 1201, an obtaining module 1202 and a detecting module 1203.

A control module 1201 for sequentially projecting a plurality of test images 2 to the light incoupling region 11; wherein, the pixel areas corresponding to a plurality of test images 2 are different, and each test image 2 has a mark line 21 with at least one direction;

the acquisition module 1202 is used for acquiring an imaging image group by adopting the same field of view, determining a target imaging image according to the number of the marking lines 21 in at least one direction in each imaging image, and transmitting the target imaging image to the detection module; the imaging image corresponding to each test image 2 forms the imaging image group; the target imaging image is an imaging image in which the imaging image group contains the largest number of marking lines 21;

the detecting module 1203 determines the angular resolution of at least one direction of the diffractive optical waveguide 1 according to the width of a group of the mark lines 21 of at least one direction in the target imaging image.

The present embodiment also provides another testing apparatus for the diffractive optical waveguide 1, and the testing apparatus for the diffractive optical waveguide 1 includes a memory and a processor. The memory is for storing an executable computer program. The processor is used for executing the testing method of the diffractive optical waveguide 1 according to the disclosed method embodiment according to the control of the executable computer program.

In one embodiment, the modules of the test apparatus of the above diffractive optical waveguide 1 can be implemented by a processor executing computer instructions stored in a memory.

< media examples >

In the present embodiment, there is also provided a computer-readable storage medium storing a computer program readable and executable by a computer, the computer program being configured to, when read and executed by the computer, perform a method of testing a diffractive optical waveguide 1 according to any of the above method embodiments of the present invention.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments, but it should be clear to a person skilled in the art that the embodiments described above can be used alone or in combination with each other as needed. In addition, for the device embodiment, since it corresponds to the method embodiment, the description is relatively simple, and for relevant points, refer to the description of the corresponding parts of the method embodiment. The system embodiments described above are merely illustrative, in that modules illustrated as separate components may or may not be physically separate.

The present invention may be a system, method and/or computer program product. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied therewith for causing a processor to implement various aspects of the present invention.

The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be interpreted as a transitory signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or an electrical signal transmitted through an electrical wire.

The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.

Computer program instructions for carrying out operations of the present invention may be assembler instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "like" programming languages, or similar programming languages. The computer readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present invention are implemented by personalizing an electronic circuit, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA), with state information of computer-readable program instructions, which can execute the computer-readable program instructions.

Aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.

These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.

The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. It is well known to those skilled in the art that implementation by hardware, implementation by software, and implementation by a combination of software and hardware are equivalent.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.

Claims

1. A test system for diffracting an optical waveguide, characterized in that the diffracting optical waveguide (1) comprises a light incoupling zone (11) and a light outcoupling zone (12), the test system comprising:

the light source module (3) is used for sequentially projecting a plurality of test images (2) to the light coupling-in area (11);

wherein the pixel areas corresponding to a plurality of the test images (2) are different, and each test image (2) is provided with a marking line (21) in at least one direction;

the vision module (4) acquires an imaging image group by adopting the same view field, determines a target imaging image according to the number of marking lines (21) in at least one direction of each imaging image in the imaging image group, and transmits the target imaging image to the detection module;

imaging images corresponding to the plurality of test images (2) form the imaging image group; the imaging image is an image obtained through the optical waveguide transmission; the target imaging image is an imaging image which contains the maximum number of marking lines (21) in the imaging image group;

and the detection module is used for determining the angular resolution of at least one direction of the diffraction light waveguide (1) according to the width of a group of mark lines (21) in at least one direction in the target imaging image.

2. The test system that diffracts a light waveguide according to claim 1, wherein the marker line (21) of the test image (2) includes a first line segment (211) and a second line segment (212), the first line segment (211) and the second line segment (212) extending in the same direction;

wherein the first line segment (211) has a first reflectivity and the second line segment (212) has a second reflectivity, wherein the first reflectivity and the second reflectivity are different.

3. The system for testing a diffractive light waveguide according to claim 1, characterized in that the number of marking lines (21) in at least one direction of each imaged image is determined based on the gray value of each imaged image acquired by the vision module (4).

4. The system of claim 1, wherein the at least one direction of marker lines (21) includes a horizontal direction of marker lines and a vertical direction of marker lines; wherein the horizontal angular resolution of the diffractive light waveguide (1) is determined on the basis of the marking lines in the horizontal direction, and the vertical angular resolution of the diffractive light waveguide (1) is determined on the basis of the marking lines in the vertical direction.

5. The system for testing a diffractive light waveguide according to claim 1, characterized in that the light source module (3) comprises an illumination source (31) and a collimating lens group (32), the test image (2) being located between the illumination source (31) and the collimating lens group (32);

the collimating lens group (32) corresponds to the light incoupling region (11) to sequentially project a plurality of test images (2) to the light incoupling region (11).

6. The system for testing a diffractive optical waveguide according to claim 1, characterized in that it comprises a position adjustment component, which moves the vision module (4) to adjust the position of the vision module (4);

the vision module (4) acquires a plurality of groups of the imaging image groups to determine a target imaging image group, wherein a plurality of target imaging images form the target imaging image group;

the detection module determines the angular resolution of at least one direction of the diffraction light waveguide (1) at different test positions according to the received target imaging image group.

7. The system for testing a diffractive light waveguide according to claim 6, characterized in that the position adjustment assembly comprises a first position adjustment assembly for adjusting the position of the vision module (4) in a first direction and a third direction to determine the angular resolution of at least one direction of the diffractive light waveguide (1) at different eye movement ranges;

wherein the first direction is a direction parallel to an extending direction of the diffractive light waveguide (1), and the third direction is a direction perpendicular to the extending direction of the diffractive light waveguide (1).

8. The system for testing a diffractive light waveguide according to claim 6 or 7, wherein the position adjustment assembly comprises a second position adjustment assembly for adjusting the position of the vision module (4) in a second direction to determine the angular resolution of the diffractive light waveguide (1) in at least one direction at different exit pupil distances.

9. The system for testing a diffractive light waveguide according to claim 1, characterized in that it comprises a first position adjustment assembly for adjusting the position of said vision module (4) in a first direction and a third direction to determine the angular resolution of said diffractive light waveguide (1) in at least one direction in different eye movement ranges, and for comparing the deviation of the angular resolution of said diffractive light waveguide (1) in at least one direction in different eye movement ranges.

10. The system for testing a diffractive light waveguide according to claim 1, characterized in that the test image (2) comprises at least two sets of marking lines (21) in one of the directions, the widths of the two sets of marking lines (21) being the same.

11. A method for testing a diffractive optical waveguide, characterized in that the diffractive optical waveguide (1) comprises a light incoupling zone (11) and a light outcoupling zone (12), said method comprising:

by projecting a plurality of test images (2) sequentially to the light incoupling zone (11); wherein each of the test images (2) has at least one directional marking line (21);

acquiring an imaging image group by adopting the same field of view, and determining a target imaging image according to the number of marking lines (21) in at least one direction in each imaging image so as to transmit the target imaging image to a detection module;

imaging images corresponding to the plurality of test images (2) form the imaging image group; the target imaging image is an imaging image which contains the maximum number of marking lines (21) in the imaging image group;

the angular resolution of at least one direction of the diffractive light guide (1) is determined according to the width of a set of marker lines (21) of at least one direction in the target imaged image.

12. A test apparatus for diffracting an optical waveguide, characterized in that the diffracting optical waveguide (1) comprises a light-in area (11) and a light-out area (12), the test apparatus comprising:

a control module for sequentially projecting a plurality of test images (2) to the light incoupling region (11); wherein the pixel areas corresponding to a plurality of the test images (2) are different, and each test image (2) is provided with a marking line (21) in at least one direction;

the acquisition module is used for acquiring an imaging image group by adopting the same view field, determining a target imaging image according to the number of marking lines (21) in at least one direction in each imaging image and transmitting the target imaging image to the detection module; imaging images corresponding to the plurality of test images (2) form the imaging image group; the target imaging image is an imaging image which contains the maximum number of marking lines (21) in the imaging image group;