CN114689281A - Method for detecting pupil drift of optical module - Google Patents
Method for detecting pupil drift of optical module Download PDFInfo
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- CN114689281A CN114689281A CN202210187419.7A CN202210187419A CN114689281A CN 114689281 A CN114689281 A CN 114689281A CN 202210187419 A CN202210187419 A CN 202210187419A CN 114689281 A CN114689281 A CN 114689281A
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- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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Abstract
The embodiment of the application discloses a method for detecting pupil drift of an optical module, which comprises an optical module to be detected, a camera module and a controller; the optical module to be tested comprises a display screen and a lens, and a target light spot on the display screen is emitted after being transmitted by the lens; the camera module is arranged on one side of the exit pupil position of the optical module to be detected, and shoots a first image of the target light spot at a first position and acquires first image position information, shoots a second image of the target light spot at a second position and acquires second image position information, shoots a third image of the target light spot at a third position and acquires third image position information; the controller is used for acquiring a first position difference value between the first image position information and the second image position information and a second position difference value between the second image position information and the third image position information, and determining a first evaluation parameter according to the first position difference value and the second position difference value, wherein the first evaluation parameter is used for representing the pupil drift performance of the optical module to be measured.
Description
Technical Field
The application relates to the technical field of optical testing, in particular to a method for detecting pupil drift of an optical module.
Background
An optical module refers to a module formed by combining various optical elements (such as optical lenses) in a certain order, which is generally used for imaging or optical information processing, and has been widely used in various types of electronic devices.
Nowadays, the forms and kinds of Virtual Reality (VR) products are diversified, and the application fields thereof are also increasingly wide. The main working principle of the virtual reality product is that after an image displayed by a display is transmitted and amplified through optical lenses, the image is received by human eyes, and the human eyes observe the amplified image (virtual image). In order to obtain a virtual reality product with better quality and better experience effect, the optical module needs to be strictly detected in production so as to be applied to the virtual display product. However, the detection of the optical module is mainly focused on the definition, contrast and stray light of the image. In fact, the pupil shift (i.e. the visual perception that the image of the system will float with the eyeball at different positions of the eyebox) parameter of the optical module is also valued by the end user, but currently, the detection of the parameter is lacking.
Disclosure of Invention
The application aims to provide a new technical scheme of a method for detecting pupil drift of an optical module.
According to an aspect of the present application, there is provided a method of detecting optical module pupil drift, the method comprising:
the optical module to be tested comprises a display screen and a lens which are sequentially arranged along the propagation direction of a light path, and light rays emitted by a target light spot on the display screen are transmitted by the lens and then emitted;
the camera module is movably arranged on one side of the exit pupil position of the optical module to be detected, the camera module shoots a first image of the target light spot at a first position and obtains first image position information, shoots a second image of the target light spot at a second position and obtains second image position information, shoots a third image of the target light spot at a third position and obtains third image position information, the first position is positioned in the extending direction of the optical axis of the lens, and the second position and the third position are respectively arranged on two opposite sides of the first position and are both positioned in the vertical direction of the optical axis of the lens; and
and the controller is used for acquiring a first position difference value between the first image position information and the second image position information and a second position difference value between the second image position information and the third image position information, and determining a first evaluation parameter according to the first position difference value and the second position difference value, wherein the first evaluation parameter is used for representing the pupil drift performance of the optical module to be measured.
Optionally, the method for detecting the pupil shift of the optical module further includes:
and when the first evaluation parameter is smaller than a set position difference threshold value, judging that the pupil drift performance of the optical module to be tested is qualified.
Optionally, when the target light point is located on the optical axis of the display screen and the camera module takes a picture at the first position, the camera module is adjusted to form a first set distance with the lens.
Optionally, the first set distance is 13mm to 18 mm.
Optionally, when the target light spot is on the display screen and in a state of being away from the optical axis, and the camera module takes a picture at the first position, the camera module is adjusted to rotate around a set rotation center to a target inclination angle with respect to the optical axis of the lens, wherein the rotation center is located in a direction in which the optical axis of the lens extends toward the camera module, and a second set distance is formed between the rotation center and the exit pupil position.
Optionally, the second set distance is 10mm to 15 mm.
Optionally, the camera module respectively shoots the target light points at the second position and the third position with the target inclination angle maintained.
Optionally, the controller further comprises:
according to the first image position information and the focal length f of the camera module, a first incident angle theta is obtained through calculationa(ii) a According to the second image position information and the focal length f of the camera module, a second incident angle theta is obtained through calculationb(ii) a According to the third image position information and the focal length f of the camera module, the third incidence angle is obtained through calculationDegree thetac(ii) a And
obtaining the first incident angle thetaaAnd the second incident angle thetabA first incident angle difference therebetween and the second incident angle thetabAnd the third incident angle thetacDetermining a second evaluation parameter according to the first incident angle difference and the second incident angle difference, wherein the second evaluation parameter is used for representing the pupil drift performance of the optical module to be tested;
and when the second evaluation parameter is smaller than a set incidence angle difference threshold value, judging that the pupil drift performance of the optical module to be tested is qualified.
Optionally, the controller further comprises:
according to the first incident angle thetaaAnd calculating the effective focal length EFL of the optical module to be measured and the image height of the target light spot to obtain a first distortion amount Dista(ii) a According to the second incident angle thetabAnd calculating the effective focal length EFL of the optical module to be measured and the image height of the target light spot to obtain a second distortion amount Distb(ii) a According to the third incident angle thetacAnd calculating the effective focal length EFL of the optical module to be measured and the image height of the target light spot to obtain a third distortion amount Distc(ii) a And
obtaining the first distortion amount DistaAnd the second distortion amount DistbA first distortion difference value therebetween and the second distortion DistbAnd the third distortion amount DistcDetermining a third evaluation parameter according to the first distortion difference and the second distortion difference, wherein the third evaluation parameter is used for representing the pupil drift performance of the optical module to be tested;
and when the third evaluation parameter is smaller than a set distortion difference threshold value, judging that the pupil drift performance of the optical module to be tested is qualified.
Optionally, the camera module is configured as a pinhole camera or a microlens array.
Optionally, the method for detecting pupil drift of an optical module further includes a driving module, where the driving module is configured to drive the camera module to move and/or rotate on one side of the exit pupil position.
Optionally, one or more lenses are provided, and the lenses are VR lenses;
the lens is arranged on the bearing structure. The beneficial effect of this application lies in:
the embodiment of the application provides a method for detecting pupil drift parameters for an optical module, wherein a special camera module is adopted to simulate human eyes to image at the light-emitting side of the optical module to be detected, and meanwhile, a coordinate system of the camera module is established to carry out translation and/or rotation, the camera module can acquire position information of images at a plurality of appointed positions, and the acquired position information can be used for accurately evaluating the pupil drift performance of the optical module to be detected after corresponding difference processing is carried out on the acquired position information; the detection method provided by the embodiment of the application has the advantages of few control parts, simple implementation method and low detection cost, and can further improve the detection effect of the optical module to obtain the optical module with better performance.
Other features of the present application 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 the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic structural diagram of hardware involved in a method for detecting pupil drift of an optical module according to an embodiment of the present disclosure;
FIG. 2 is a second schematic structural diagram illustrating hardware involved in a method for detecting pupil drift of an optical module according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of the pupil shifting performance of an optical module;
FIG. 4 is a diagram illustrating poor pupil drift performance of an optical module.
Description of the reference numerals:
1. a display screen; 2. a load bearing structure; 3. a lens; 4. an exit pupil position; 5. a camera module; 51. a first position; 52. a second position; 53. a third position; 6. a target light spot; 7. a center of rotation.
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, methods, 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, further discussion thereof is not required in subsequent figures.
The method for detecting the pupil shift of the optical module according to the embodiment of the present application is described in detail below with reference to fig. 1 to 4.
According to an aspect of the embodiments of the present application, there is provided a method for detecting pupil drift of an optical module, where hardware relied on in the method includes the optical module to be detected, a camera module 5 and a controller, and may be specifically shown in fig. 1 and fig. 2;
the optical module to be tested comprises a display screen 1 and a lens 3 which are sequentially arranged along the propagation direction of a light path, and light emitted by a target light spot 6 on the display screen 1 is transmitted by the lens 3 and then emitted;
the camera module 5 is movably arranged on one side of an exit pupil position 4 of the optical module to be measured, the camera module 5 shoots a first image of the objective light spot 6 and obtains first image position information at a first position 51, shoots a second image of the objective light spot and obtains second image position information at a second position 52, shoots a third image of the objective light spot at a third position 53 and obtains third image position information, the first position 51 is located in the extending direction of the optical axis of the lens 3, and the second position 52 and the third position 53 are respectively arranged on two opposite sides of the first position 51 and are both located in the vertical direction of the optical axis of the lens 3;
and the controller is used for acquiring a first position difference value between the first image position information and the second image position information and a second position difference value between the second image position information and the third image position information, and determining a first evaluation parameter according to the first position difference value and the second position difference value, wherein the first evaluation parameter is used for representing the pupil drift performance of the optical module to be measured.
The embodiment of the application provides a method for detecting pupil drift parameters for an optical module, wherein a special camera module 5 is adopted to simulate human eyes to image at the light-emitting side of the optical module to be detected, and meanwhile, a coordinate system of the camera module is established to carry out translation and/or rotation, the camera module 5 can acquire position information of images at a plurality of appointed positions, and the acquired position information can be used for accurately evaluating the pupil drift performance of the optical module to be detected after corresponding difference processing is carried out on the acquired position information; the detection method provided by the embodiment of the application has the advantages of few control parts, simple implementation method and low detection cost, and can further improve the detection effect of the optical module to obtain the optical module with better performance.
The method for detecting an optical module provided by the embodiment of the application is completely different from the parameters of the optical module detected by the traditional optical module detection method, and is a method specially used for detecting the pupil drift performance of the optical module. Through carrying out accurate detection to the pupil drift performance of optical module, the optical performance of evaluation optical module that can be better. The blank in the aspect of detecting the pupil drift performance of the optical module is made up.
As shown in fig. 3, for an optical module with better pupil drift performance, light emitted from a target light spot 6 (or a characteristic point) displayed on a display screen 1 (image plane) is transmitted by a lens 3 and then exits, and parallel light exits. On the basis, when the camera module receives the outgoing parallel light at the light outgoing side of the lens 3, no matter the camera module is at any position of a, b and c for shooting, the position of the camera imaging point will not change (that is, the angle of the light incident to the lens of the camera module is the same).
On the contrary, as shown in fig. 4, for an optical module with poor pupil drift performance, light rays emitted by a target light spot 6 (or a characteristic point) displayed on the display screen 1 (image plane) are transmitted through the lens 3 and then emitted, at this time, the light rays emitted through the lens 3 are obviously seen as disordered, and each emitted light ray has a certain included angle. On the basis, when the camera module acquires the light rays of the a ' position, the b ' position and the c ' position respectively, the position of the point imaged by the camera module changes (i.e. the angle of the light rays incident to the camera lens deviates), which is not favorable for imaging.
The optical module in the embodiment of the present application may be applied to various types of electronic products, such as Virtual Reality (VR) devices, and a person skilled in the art may flexibly select an application scenario according to a specific situation, which is not limited herein.
Taking VR equipment (including VR glasses or VR head-mounted devices) as an example, an optical module is arranged in the equipment, and if the optical module has a problem of poor pupil drift performance, an image observed by eyes of a viewer may be distorted, deformed and the like, which may cause a series of adverse reactions such as nausea and visual fatigue of the viewer, and may seriously affect user experience. Therefore, in the process of producing the optical module, it is necessary to use the pupil drift performance of the optical module as an important index for effective quality inspection, which can be used as one of the criteria for determining whether the produced optical module really meets the qualified standards. The optical module with reasonable pupil drift performance achieved through the detection can ensure that VR equipment meets better imaging quality requirements, and improves the use experience of users.
In some examples of the present application, the method of detecting optical module pupil drift further comprises: and when the first evaluation parameter is smaller than a set position difference threshold value, judging that the pupil drift performance of the optical module to be tested is qualified.
That is, after comparing the first evaluation parameter with the set position difference threshold, when the acquired first evaluation parameter is determined to be smaller than the set position difference threshold, it indicates that the pupil shift performance of the optical module is qualified, and the method may be applied to a corresponding electronic device, such as a VR device. On the contrary, when the first evaluation parameter is determined to be larger than the set position difference threshold, the pupil drift performance of the optical module cannot reach the standard, namely the pupil drift of the optical module is unqualified.
It should be noted that, a person skilled in the art may flexibly adjust the set position difference threshold according to a specific application scenario of the optical module, which is not specifically limited in the embodiment of the present application.
In some examples of the present application, as shown in fig. 1, when the object light point 6 is located on the optical axis of the display screen 1 and the camera module 5 takes a picture at the first position 51, the camera module 5 is adjusted to form a first set distance with the lens 3.
That is, when measuring the pupil shift performance of the paraxial field of view of the optical module, the target spot 6 is a characteristic point of the central region of the display screen 1, that is, the target spot 6 is on the optical axis of the optical module, as shown in fig. 1.
For example, the camera module 5 is disposed on a light emitting side of the lens 3, and the camera module 5 is located on an extension line of an optical axis of the lens 3 (that is, the camera module 5 and the lens 3 are disposed on the same optical axis), when the camera module 5 is at a first position 51, the camera module 5 captures a first image of the target light spot 6 and obtains the first image position information Pa; then, when the camera module 5 is moved ± 2mm in the direction perpendicular to the optical axis relative to the first position 51, the camera module 5 is moved to a second position 52 and a third position 53, at which time, a second image of the target light spot 6 is captured at the second position 52 and the second image position information Pb is obtained, and a third image of the target light spot 6 is captured at the third position 53 and the third image position information Pc is obtained; finally, difference comparison is performed on the three pieces of position information Pa, Pb, and Pc to obtain a position difference quantity Diff (Pa, Pb, Pc), which is the Diff (Pa, Pb, Pc) as the first evaluation parameter, specifically:
amount of difference in position
The position difference is a quantitative parameter representing the pupil drift of the optical module to be measured.
Optionally, when the target light point 6 is located on the optical axis of the display screen 1 and the camera module 5 takes a picture at the first position 51, the camera module 5 is adjusted to form a first set distance with the lens 3, and the first set distance may be set to 13mm to 18 mm.
The detection effect is better under the distance. Meanwhile, the detection distance has better universality and is suitable for detecting pupil drift of most optical modules.
When the human eye is simulated by using different camera modules, the first set distance may be flexibly adjusted based on different optical properties (optical parameters, etc.) of the different camera modules, that is, the first set distance may not be limited to 13mm to 18 mm. The first set distance shown in the embodiment of the present application can satisfy most camera modules.
In other examples of the present application, as shown in fig. 2, when the objective point 6 is on the display screen 1 and is in an off-optical axis state, and the camera module 5 performs shooting at the first position 51, the camera module 5 is adjusted to rotate to an objective tilt angle relative to the optical axis of the lens 3 around a set rotation center 7, wherein the rotation center 7 is located in a direction in which the optical axis of the lens 3 extends toward the camera module 5, and a second set distance is formed between the rotation center 7 and the exit pupil position 4.
The state that the target light spot 6 is away from the optical axis on the display screen 1 means that the target light spot 6 is not in the central area of the display screen 1, but in an area deviating from the optical axis, which may be specifically the position of the target light spot 6 shown in fig. 2.
In the real VR use experience, when a viewer views a scene of a near-field off-axis field, that is, when the target light point 6 is not on the optical axis, at this time, the simple translational motion of the camera module cannot simulate the real eye movement, so eye rotation (eyeball rotation) needs to be introduced, that is, the camera module 5 is controlled to rotate by a predetermined amount, so as to simulate the rotation of the eye.
That is, as shown in fig. 2, a characteristic point is displayed at an off-axis position of the display screen 1, and is used as a target light spot 6, and light emitted from the target light spot 6 is transmitted through the lens 3 and then exits.
It should be noted that, when the camera module 5 performs shooting at the first position 51, the camera module 5 and the lens 3 are still on the same optical axis, and the camera module 5 is further rotated by a set angle to image and control the object light spot 6 in the sensor central area of the camera module 5, at this time, a first image of the object light spot 6 is shot and the first image position information Oa is obtained; then, the camera module 5 is moved, specifically moved by ± 2mm in a direction perpendicular to the optical axis relative to the first position 51, so that the camera module 5 is moved from the first position to the second position 52 and the third position 53, at this time, a second image of the target light spot 6 is captured at the second position 52 and the second image position information Ob is obtained, and a third image of the target light spot 6 is captured at the third position 53 and the third image position information Oc is obtained; finally, comparing the position difference of Oa, Ob, and Oc to obtain a position difference quantity Diff (Oa, Ob, Oc) (the position difference quantity is also the first evaluation parameter), which is as follows:
amount of difference in position
The position difference can represent the quantitative parameter of the pupil drift of the optical module to be measured.
Wherein, the rotation radius of the camera module 5 is controlled to be 12mm, for example.
In addition, it should be noted that, in the embodiment of the present application, a person skilled in the art may flexibly adjust the rotation angle and the rotation radius of the camera module 5 according to needs, and this is not particularly limited in the embodiment of the present application.
Optionally, the second set distance is 10mm to 15 mm.
Further, the second set distance is 12 mm.
As shown in fig. 2, the camera module 5 respectively photographs the target light spot 6 at the target inclination angle at the second position 52 and the third position 53.
That is, the camera module 5 has adjusted the shooting angle for shooting the object light point 6 before shooting at the first position 51. When the camera module 5 is adjusted to the second position 52 and the third position 53 for shooting, respectively, the shooting angle of the camera module 5 is not changed.
In some examples of the present application, the method of detecting optical module pupil drift, wherein the controller further comprises the operations of:
based on the first image position information (e.g. P)a) Calculating the focal length f of the camera module to obtain a first incident angle thetaa(ii) a According to the secondImage position information (e.g., P)b) Calculating the focal length f of the camera module to obtain a second incident angle thetab(ii) a Based on said third image position information (e.g. P)c) And the focal length f of the camera module is calculated to obtain the third incident angle thetac(ii) a And
obtaining the first incident angle thetaaAnd the second incident angle thetabA first incident angle difference therebetween and the second incident angle thetabAnd the third incident angle thetacDetermining a second evaluation parameter according to the first incident angle difference and the second incident angle difference, wherein the second evaluation parameter is used for representing the pupil drift performance of the optical module to be tested;
and when the second evaluation parameter is smaller than a set incidence angle difference threshold value, judging that the pupil drift performance of the optical module to be tested is qualified. That is, in some embodiments of the present application, another parameter, namely, the difference in incident angle Diff θ, is provided to characterize the pupil drift performance of the optical module.
For example, in the embodiment of the present application, the quantitative parameter characterizing the pupil shift of the optical module is the position difference of the image in the photosensitive area of the camera module 5, i.e. the image
That is, in addition to the position difference amount, the pupil shift performance of the optical module can also be quantified by obtaining the angle difference amount of the incident angle through the functional relationship function (AOI) of the incident light angle and the imaging position of the camera module 5.
Given that the focal length of the lens of the camera module 5 is f, and the distortion of the camera module 5 used is < 0.5%, neglecting the distortion effect, the relationship is as follows:
the target spot 6 is imaged (first image) at the first position (e.g. P)a) Is first ofIncident angle thetaaComprises the following steps:
similarly, the target spot 6 is imaged (second image) at the second position (e.g. P)b) At a second angle of incidence thetabAnd said third position (e.g. P)c) At a third angle of incidence thetacRespectively as follows:
the second evaluation parameter is specifically as follows:
in some examples of the present application, the method of detecting optical module pupil drift, wherein the controller further comprises:
according to the first incident angle thetaaAnd calculating the effective focal length EFL of the optical module to be measured and the image height of the target light spot to obtain a first distortion amount Dista(ii) a According to the second incident angle thetabAnd calculating the effective focal length EFL of the optical module to be measured and the image height of the target light spot to obtain a second distortion quantity Distb(ii) a According to the third incident angle thetacAnd calculating the effective focal length EFL of the optical module to be measured and the image height of the target light spot to obtain a third distortion amount Distc(ii) a And acquiring the first distortion amount DistaAnd the second distortion amount DistbA first distortion difference value therebetween and the second distortion DistbAnd the third distortion amount DistcA second difference in distortion amount between them,determining a third evaluation parameter according to the first distortion difference and the second distortion difference, wherein the third evaluation parameter is used for representing the pupil drift performance of the optical module to be tested;
and when the third evaluation parameter is smaller than a set distortion difference threshold value, judging that the pupil drift performance of the optical module to be tested is qualified.
That is, in some embodiments of the present application, a further parameter, i.e., the third evaluation parameter, i.e., the distortion difference Diff, is providedDistTo characterize the pupil drift performance of the optical module.
On the basis of obtaining the incident angles of the camera module 5 at different positions (such as the three positions), for example, the first incident angle θaThe second incident angle thetabAnd the third incident angle thetacIn addition, for example, the effective focal length EFL of the optical module to be measured and the height IH of the target light spot image may be combined, so as to further obtain the distortion amount Dist at different positions, i.e. Dist ═ 100% (1- (IH/(EFL × Tan (θ)))). Namely, the incident angles at different positions obtain different distortion amounts, and the size of the distortion amount can directly reflect the visual perception of the user experience.
For example, the first distortion amount DistaThe second distortion amount DistbAnd the third distortion amount DistcRespectively as follows:
the third evaluation parameter is specifically as follows:
it should be noted that, a person skilled in the art may characterize the pupil shift of the optical module according to at least one of the first evaluation parameter, the second evaluation parameter, and the third evaluation parameter, and the person skilled in the art may flexibly select the parameter according to a specific situation, which is not specifically limited in the embodiment of the present application.
In some examples of the present application, the camera module 5 is configured as a pinhole camera.
The pinhole camera has the characteristics of small distortion and small angle of view.
Further, the camera module 5 is optionally provided as a microlens array.
For example, the lenslet array test mode Shack-Hartmann method replaces the pinhole camera mode.
In some examples of the present application, the method for detecting pupil drift of an optical module further includes hardware having a driving module, where the driving module may be directly connected to the camera module 5, and the driving module is configured to drive the camera module 5 to move and/or rotate on one side of the exit pupil position 4, so as to truly simulate the motion of the human eye.
In some examples of the present application, the lens 3 is provided as one or more lenses, and the lens 3 is a VR lens; the lens 3 is arranged on a carrying structure.
Wherein the optical module comprises one or more lenses 3, for example.
It should be noted that, a person skilled in the art may adjust the number of lenses constituting the optical module according to specific needs, and since the present application does not relate to the improvement of the structure of the optical module, the embodiments of the present application do not limit the specific structure of the optical module herein.
In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.
Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.
Claims (12)
1. A method of detecting pupil drift in an optical module, comprising:
the optical module to be tested comprises a display screen and a lens which are sequentially arranged along the propagation direction of a light path, and light rays emitted by a target light spot on the display screen are transmitted by the lens and then emitted;
the camera module is movably arranged on one side of the exit pupil position of the optical module to be detected, the camera module shoots a first image of the target light spot at a first position and obtains first image position information, shoots a second image of the target light spot at a second position and obtains second image position information, and shoots a third image of the target light spot at a third position and obtains third image position information, the first position is positioned in the extending direction of the optical axis of the lens, and the second position and the third position are respectively arranged on two opposite sides of the first position and are both positioned in the vertical direction of the optical axis of the lens; and
and the controller is used for acquiring a first position difference value between the first image position information and the second image position information and a second position difference value between the second image position information and the third image position information, and determining a first evaluation parameter according to the first position difference value and the second position difference value, wherein the first evaluation parameter is used for representing the pupil drift performance of the optical module to be tested.
2. A method of detecting optical module pupil drift according to claim 1, further comprising: and when the first evaluation parameter is smaller than a set position difference threshold value, judging that the pupil drift performance of the optical module to be tested is qualified.
3. The method of claim 1, wherein the camera module is adjusted to form a first set distance with the lens when the camera module takes a photograph at the first position when the target light point is on the optical axis of the display screen.
4. The method of detecting pupil drift of an optical module according to claim 3, wherein the first set distance is 13mm to 18 mm.
5. A method for detecting pupil drift of an optical module according to claim 1, wherein when the objective spot is on the display screen and is off the optical axis and the camera module takes a picture at the first position, the camera module is adjusted to rotate to a target tilt angle with respect to the optical axis of the lens around a set center of rotation, wherein the center of rotation is in a direction in which the optical axis of the lens extends toward the camera module, and wherein a second set distance is formed between the center of rotation and the exit pupil position.
6. The method of detecting pupil shift of an optical module according to claim 5, wherein the second set distance is 10mm to 15 mm.
7. The method of detecting optical module pupil drift according to claim 5, wherein the camera module respectively photographs the target light spot while maintaining the target tilt angle in both the second position and the third position.
8. The method of detecting optical module pupil drift of claim 1, wherein the controller further comprises:
according to the first image position information and the focal length f of the camera module, a first incident angle theta is obtained through calculationa(ii) a According to the second image position information and the focal length f of the camera module, a second incident angle theta is obtained through calculationb(ii) a According to the third image position information and the focal length f of the camera module, the third incident angle theta is obtained through calculationc(ii) a And
obtaining the first incident angle thetaaAnd the second incident angle thetabA first incident angle difference therebetween and the second incident angle thetabAnd the third incident angle thetacDetermining a second evaluation parameter according to the first incident angle difference and the second incident angle difference, wherein the second evaluation parameter is used for representing the pupil drift performance of the optical module to be tested;
and when the second evaluation parameter is smaller than a set incident angle difference threshold value, judging that the pupil drift performance of the optical module to be tested is qualified.
9. The method of detecting optical module pupil drift of claim 8, wherein the controller further comprises:
according to the first incident angle thetaaAnd calculating the effective focal length EFL of the optical module to be measured and the image height of the target light spot to obtain a first distortion amount Dista(ii) a According to the second incident angle thetabAnd calculating the effective focal length EFL of the optical module to be measured and the image height of the target light spot to obtain a second distortion quantity Distb(ii) a According to the third incident angle thetacAnd calculating the effective focal length EFL of the optical module to be measured and the image height of the target light spot to obtain a third distortion amount Distc(ii) a And
obtaining the first distortion amount DistaAnd the second distortion amount DistbFirst distortion betweenThe difference and the second distortion DistbAnd the third distortion amount DistcDetermining a third evaluation parameter according to the first distortion difference and the second distortion difference, wherein the third evaluation parameter is used for representing the pupil drift performance of the optical module to be tested;
and when the third evaluation parameter is smaller than a set distortion difference threshold value, judging that the pupil drift performance of the optical module to be tested is qualified.
10. A method of detecting optical module pupil drift according to claim 1, wherein the camera module is arranged as a pinhole camera or a micro-lens array.
11. The method of claim 1, further comprising a drive module for driving the camera module to move and/or rotate on one side of the exit pupil position.
12. The method for detecting pupil drift of an optical module according to claim 1, wherein the lens is one or more lenses, and the lens is a VR lens;
the lens is arranged on the bearing structure.
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| US20210373352A1 (en) * | 2018-06-11 | 2021-12-02 | Goertek Inc. | Positioning Method and Positioning Apparatus for Display Screen in Optical Module |
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