Optical axis alignment method and optical axis alignment device for optical film assembly

Abstract

The embodiment of the invention provides an optical axis alignment method and an optical axis alignment device for an optical film assembly. The optical film assembly comprises a first optical film and a second optical film, the first optical film is a phase delay film, and the second optical film can selectively allow polarized light to pass through; the optical axis alignment method for the optical film assembly comprises the following steps: emitting circularly polarized light to the optical film assembly, so that the circularly polarized light sequentially passes through a first optical film and a second optical film and is received by a first optical detector; controlling the first optical film to rotate for the first time; establishing a relation model between the power and the rotation angle according to the change of the power of the light received by the first optical detector along with the rotation angle of the first optical film; and controlling the first optical film to rotate for the second time according to the relation model so as to align the optical axis of the first optical film and the optical axis of the second optical film.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of optical axis alignment, and more specifically, to an optical axis alignment method and an optical axis alignment device for an optical film assembly. Background Art

[0002] At present, the production process of the modules corresponding to the pancake solution involves the lamination of multi-layer optical films. During the lamination process of the pancake solution, the optical axis is aligned only by CCD positioning reference edge. Because there is a deviation between the optical axis and the reference edge during the production and processing of the phase retardation film, absorption polarizer or reflection polarizer, it is impossible to achieve high-precision alignment of the optical axis between the phase retardation film and the absorption polarizer or between the phase retardation film and the reflection polarizer, which ultimately affects the optical imaging effect.

[0003] In view of this, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0004] The purpose of the present application is to provide a new technical solution for an optical axis alignment method and an optical axis alignment device of an optical film assembly.

[0005] In a first aspect, the present application provides a method for aligning the optical axis of an optical film assembly. The optical film assembly includes a first optical film and a second optical film, wherein the first optical film is a phase delay film, and the second optical film can selectively allow polarized light to pass through;

[0006] The optical axis alignment method of the optical film assembly comprises:

[0007] emitting circularly polarized light to the optical film assembly, so that the circularly polarized light passes through the first optical film and the second optical film in sequence and is received by a first light detector;

[0008] controlling the first optical film to rotate for the first time;

[0009] Establishing a relationship model between power and rotation angle according to the change of the power of light received by the first light detector as the first optical film rotates at an angle;

[0010] The first optical film is controlled to rotate for a second time according to the relationship model, so that the optical axis of the first optical film and the optical axis of the second optical film are aligned.

[0011] Optionally, emitting circularly polarized light to the optical film assembly specifically includes:

[0012] The laser is emitted to the optical film assembly so that the laser passes through the circular polarizer to emit circularly polarized light.

[0013] Optionally, the relationship model satisfies a sinusoidal function.

[0014] Optionally, controlling the first optical film to rotate for the second time according to the relationship model specifically includes:

[0015] determining key power characteristics according to the relationship model;

[0016] The first optical film is controlled to rotate for a second time so that the power of the light received by the first light detector meets a key power characteristic.

[0017] Optionally, determining the key power feature according to the relationship model specifically includes:

[0018] The power of the light received by the first light detector when it is at a peak position or a trough position is a key power feature.

[0019] Optionally, before emitting laser light to the optical film assembly so that the laser light passes through the circular polarizer to emit circularly polarized light, the method further includes:

[0020] Laser is emitted to the optical film assembly, and the laser is divided into a first laser and a second laser through a beam splitter. The first laser emits circularly polarized light through the circular polarizer, and the second laser is received by a second light detector.

[0021] In a second aspect, an embodiment of the present application provides an optical axis alignment device for an optical film assembly. The optical axis alignment device for an optical film assembly uses the optical axis alignment method for an optical film assembly as described in the first aspect to achieve optical axis alignment of a first optical film and a second optical film;

[0022] The optical axis alignment device of the optical film assembly comprises:

[0023] A light source assembly, wherein the light source assembly emits circularly polarized light;

[0024] A first light detector is used to receive the light emitted from the second optical film.

[0025] Optionally, the light source assembly includes a light source body and a circular polarizer;

[0026] The light source body emits laser light;

[0027] The circular polarizer converts the laser light into circularly polarized light.

[0028] Optionally, the light source assembly further includes a beam splitter, which is located between the light source body and the circular polarizer, and the beam splitter splits the laser into a first laser and a second laser, and the first laser is transmitted to the circular polarizer.

[0029] Optionally, the optical film assembly optical axis alignment device further includes a second light detector, and the second light detector receives the second laser.

[0030] According to an embodiment of the present application, a method for aligning the optical axis of an optical film assembly is provided, which improves the optical axis alignment accuracy of a first optical film and a second optical film in the optical film assembly.

[0031] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0033] Figure 1 Shown is a flow chart of a method for aligning the optical axis of an optical film assembly provided in an embodiment of the present application.

[0034] Figure 2 Shown is a schematic structural diagram of an optical axis alignment device for an optical film assembly provided in an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 10. Light source body; 11. Circular polarizer; 12. Beam splitter;

[0037] 2. First photodetector; 3. Second photodetector; 41. First optical film; 42. Second optical film. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0039] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0040] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0041] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0042] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0043] An optical film assembly is generally a combination of any two film layers of a polarizing film (POL film), a reflective polarizing film (RP film) and a phase delay film (QWP film) aligned together. Usually, the polarizing film (POL film) and the quarter wave plate (QWP film) are aligned, or the reflective polarizing film (RP film) and the phase delay film (QWP film) are aligned. The optical film assembly is combined with the lens group to form an optical module with a folded optical path. The imaging quality of the optical module will be affected by the alignment angle of the optical axis of the optical film assembly. Slight angle differences will seriously affect the imaging effect, and will also affect the user experience and eye comfort. Therefore, it is very necessary to improve the accuracy of the optical axis alignment of the optical film assembly.

[0044] Taking the alignment of a phase delay film (QWP film) and a reflective polarizing film (RP film) as an example, in the prior art, the QWP film has an optical axis and the RP film has an optical axis. The QWP film is cut based on the optical axis of the QWP film to form an alignment edge, and the RP film is cut based on the optical axis of the RP film to form an alignment edge. The alignment edge of the QWP film and the alignment edge of the RP film are aligned to achieve alignment of the optical axis of the QWP film and the optical axis of the RP film.

[0045] However, in the prior art alignment method, when cutting the diaphragm to form the alignment edge, there will be a cutting error between the alignment edge and the optical axis of the diaphragm, and when aligning two diaphragms, there will be an alignment angle error between the two alignment edges. The accumulation of multiple errors reduces the accuracy of the alignment of the optical axes of the two diaphragms.

[0046] Based on the above problems, the first aspect of the embodiment of the present application provides an optical axis alignment method of an optical film assembly to improve the alignment accuracy of two films during alignment. The optical film assembly includes a first optical film 41 and a second optical film 42, wherein the first optical film 41 is a phase delay film, and the second optical film 42 can selectively allow polarized light to pass through. For example, the first optical film 41 can be a QWP film, and the second optical film 42 can be a POL film or a RP film.

[0047] Reference Figure 1 The optical axis alignment method of the optical film assembly comprises the following steps:

[0048] S101: emitting circularly polarized light to the optical film assembly, the circularly polarized light passes through the first optical film 41 and the second optical film 42 in sequence, and is received by the first light detector 2;

[0049] S102: controlling the first optical film 41 to rotate for the first time;

[0050] S103: establishing a relationship model between power and rotation angle according to the change of the power of the light received by the first light detector 2 as the first optical film 41 rotates at an angle;

[0051] S104: controlling the first optical film 41 to rotate for a second time according to the relationship model, so that the optical axis of the first optical film 41 and the optical axis of the second optical film 42 are aligned.

[0052] In step S101 , circularly polarized light is emitted to the optical film assembly. After the circularly polarized light passes through the first optical film 41 , it is ensured that the first optical film 41 emits linearly polarized light.

[0053] The circularly polarized light emitted to the optical film assembly needs to pass through the first optical film 41 and the second optical film 42 in sequence to ensure that the power of the light received by the first light detector 2 changes in real time, so as to facilitate the alignment of the optical axis of the first optical film 41 and the optical axis of the second optical film 42.

[0054] For example, when the circularly polarized light emitted by the optical film assembly passes through the second optical film 42 and then the first optical film 41 in sequence, the circularly polarized light is converted into linearly polarized light after passing through the second optical film 42 (because the circularly polarized light passes through the second optical film 42, the power of the light emitted from the second optical film 42 does not change much), and the linearly polarized light is projected to the first optical film 41 in the direction of ±45°. The first optical film 41 emits circularly polarized light. In this way, the light rate of the light received by the first light detector 2 does not change much, and the relationship between the optical axis of the first optical film 41 and the optical axis of the second optical film 42 cannot be determined.

[0055] In addition, when the light emitted to the optical module is linearly polarized light, the linearly polarized light sequentially passes through the first optical film 41 and the second optical film 42. When the linearly polarized light is projected to the first optical film 41 in the direction of ±45°, the first optical film 41 emits circularly polarized light. Since the circularly polarized light passes through the second optical film 42, the power of the light emitted from the second optical film 42 does not change much, which makes it difficult to achieve alignment of the optical axis of the first optical film 41 and the optical axis of the second optical film 42.

[0056] If the light emitted to the optical film assembly is linearly polarized light, the linearly polarized light passes through the second optical film 42 and the first optical film 41 in sequence. When the vibration direction of the linearly polarized light is perpendicular to the transmission axis direction of the second optical film 42, the linearly polarized light will not pass through the second optical film 42, and thus it is impossible to align the optical axis of the first optical film 41 and the optical axis of the second optical film 42.

[0057] Therefore, in this step, on the one hand, it is necessary to ensure that the light received by the first optical film 41 is circularly polarized light, and the light received by the second optical film 42 is linearly polarized light; on the other hand, when emitting light to the optical film assembly, the transmission order of the light needs to be first through the first optical film 41 and then through the second optical film 42.

[0058] In step S102 , the first optical film 41 is controlled to rotate for the first time, and then passes through the second optical film 42 , and is finally received by the first light detector 2 .

[0059] In one example, the first optical film 41 can be driven to rotate by a driving motor or a driving motor, so that the first optical film 41 rotates relative to the second optical film 42, for example, it can be rotated 180° or 360° or the first optical film 41 can be rotated a greater number of times relative to the second optical film 42, so that the power of the light received by the first light detector 2 changes in real time.

[0060] The first optical film 41 may be attached to the optical lens to ensure that the driving motor or driving electric motor can drive the first optical film 41 to rotate.

[0061] In this step, it is necessary to drive the first optical film 41 to rotate relative to the second optical film 42. The first optical film 41 is a QWP film. During the rotation of the first optical film 41, when the incident light polarization direction and the angle between the two axes of the first optical film 41 are 45°, the circularly polarized light becomes linearly polarized light after passing through the quarter wave plate. The vibration direction of the linearly polarized light is consistent with the reflection axis direction of the second optical film 42. At this time, the first light detector 2 receives the weakest light energy; if the vibration direction of the linearly polarized light is consistent with the transmission axis direction of the second optical film 42, the first light detector 2 receives the strongest light energy.

[0062] When the first light detector 2 receives the strongest light energy, the relationship between the vibration direction of the linear polarized light and the transmission axis direction is determined, and the vibration direction of the linear polarized light and the optical axis direction of the first optical film 41 are determined. This makes it easy to determine the relationship between the optical axis of the first optical film 41 and the optical axis of the second optical film 42, that is, it is beneficial to align the optical axis of the first optical film 41 with the optical axis of the second optical film 42.

[0063] In step S103 , a relationship model between power and rotation angle is established according to the change of the power of the light received by the first light detector 2 along with the rotation angle of the first optical film 41 .

[0064] For example, in step S102 , the first optical film 41 is driven to rotate. In step S103 , a relationship model between power and rotation angle is established according to the change of the power of light received by the first light detector 2 along with the rotation angle of the first optical film 41 .

[0065] In one example, the first optical film 41 is driven to rotate, and the first optical film 41 is a quarter wave plate, so that the angle between the polarization direction of the incident light and the two axes of the first optical film 41 changes in real time, so as to change the polarization state of the light emitted from the first optical film 41. For example, the angle between the polarization direction of the incident light and the two axes of the first optical film 41 is 45°, and at this time, the circularly polarized light becomes linearly polarized light after passing through the quarter wave plate.

[0066] When the first optical film 41 emits linearly polarized light, the vibration direction of the linearly polarized light is consistent with the transmission axis direction of the second optical film 42. At this time, in the relationship model between power and rotation angle, the power is the highest point; when the first optical film 41 emits linearly polarized light, the vibration direction of the linearly polarized light is perpendicular to the transmission axis direction of the second optical film 42. At this time, in the relationship model between power and rotation angle, the power is the lowest point.

[0067] Optionally, the first optical film 41 is driven to rotate, and the first light detector 2 detects the energy of the received light in real time to generate a "rotation angle-power" relationship model, and the lowest energy point (i.e., the lowest power point) is determined based on the "rotation angle-power" relationship model.

[0068] It should be noted that, according to the "rotation angle-power" relationship model, the lowest energy point (i.e., the lowest power point) is determined, wherein when the lowest energy point is determined, slight fluctuations in energy are easier to detect, and therefore it is preferred to align the optical axis of the first optical film 41 and the optical axis of the second optical film 42 by determining the lowest energy point.

[0069] In step S104 , the first optical film 41 is controlled to rotate for the second time according to the relationship model, so that the optical axis of the first optical film 41 and the optical axis of the second optical film 42 are aligned.

[0070] In this step, according to the "rotation angle-power" relationship model, the rotation of the first optical film 41 can be re-controlled. After the light energy received by the first light detector 2 reaches the target energy, it is proved that the optical axis of the first optical film 41 and the optical axis of the second optical film 42 are aligned.

[0071] Therefore, in the embodiment of the present application, the optical axis of the first optical film 41 and the optical axis of the second optical film 42 are aligned by controlling the rotation of the first optical film 41 multiple times and combining the "rotation angle-power" relationship model, thereby improving the alignment accuracy of the optical axis of the first optical film 41 and the optical axis of the second optical film 42.

[0072] In one embodiment, emitting circularly polarized light to the optical film assembly specifically comprises:

[0073] Laser is emitted to the optical film assembly, so that the laser passes through the circular polarizer 11 to emit circularly polarized light.

[0074] In this embodiment, the specific method of emitting circularly polarized light to the optical film assembly is: emitting laser to the optical film assembly, the laser can be linearly polarized light, elliptically polarized light, or circularly polarized light. No matter what type of polarization light the laser is, the laser emits circularly polarized light through the circular polarizer 11.

[0075] For example, the circular polarizer 11 is composed of a linear polarizer and a quarter wave plate. When the laser is elliptically polarized light or circularly polarized light, the linear polarizer can decompose the natural light into polarized light along the polarization direction and polarized light perpendicular to the polarization direction, while the quarter wave plate can decompose the polarized light into circularly polarized light rotating along the direction of the light. Therefore, the laser is emitted to the optical film assembly, and the laser passes through the circular polarizer 11 to emit circularly polarized light, and the circularly polarized light passes through the first optical film 41 and the second optical film 42 in sequence and is received by the first light detector 2.

[0076] In one embodiment, the relationship model satisfies a sinusoidal function.

[0077] In this embodiment, the first optical film 41 is controlled to rotate for the first time so that the circularly polarized light passes through different positions of the first optical film 41 and is received by the first light detector 2. In this way, a relationship model between the power and the rotation angle is established according to the change of the power of the light received by the first light detector 2 as the rotation angle of the first optical film 41 changes.

[0078] For example, in the process of establishing the relationship model between power and rotation angle, a plurality of sampling intervals are formed according to the rotation angle of the first optical film 41, and the rotation angle of the first optical film 41 and the power after the first power meter receives the light are sampled multiple times in each sampling interval, and the relationship model between power and rotation angle is established based on the sampling data. Specifically, a surface fitting is performed based on the rotation angle data of the first optical film 41 and the power data of the light received by the first power meter to form a relationship model between power and rotation angle. The relationship model between power and rotation angle determines the relationship between the optical axis of the first optical film 41 and the optical axis of the second optical film 42.

[0079] For example, the relationship model between power and rotation angle conforms to a sine function. When the power is at a trough position, it proves that the optical axis of the first optical film 41 (for example, the fast axis 45°) is aligned with the reflection optical axis of the second optical film 42; when the power is at a peak position, it proves that the optical axis of the first optical film 41 (for example, the fast axis 45°) is aligned with the transmission optical axis of the second optical film 42.

[0080] In one embodiment, controlling the first optical film 41 to rotate for the second time according to the relationship model specifically includes:

[0081] determining key power characteristics according to the relationship model;

[0082] The first optical film 41 is controlled to rotate for the second time, so that the power of the light received by the first light detector 2 meets the key power characteristic.

[0083] In this embodiment, the first optical film 41 is controlled to rotate for the second time according to the relationship model. For example, the first optical film 41 is controlled to rotate. The first light detector 2 monitors the energy of the received light in real time. When the first light detector 2 detects the lowest power, or when the first light detector 2 detects the highest power, the optical axis of the first optical film 41 and the optical axis of the second optical film 42 are aligned.

[0084] In this embodiment, controlling the rotation of the first optical film 41 for the second time according to the relationship model specifically includes: determining a key power feature according to the relationship model, wherein the key power feature can clearly characterize the relationship between the optical axis of the first optical film 41 and the optical axis of the second optical film 42, and thus the key power feature is the power when the power of the light received by the first light detector 2 is at a peak position or a trough position.

[0085] Then the first optical film 41 is controlled to rotate for the second time, for example, the first optical film 41 can be controlled to rotate or the first optical film 41 can be controlled to continue to rotate, so that the power of the light received by the first light detector 2 meets the key power characteristic. When the power of the light received by the first light detector 2 meets the key power characteristic, the relationship between the optical axis of the first optical film 41 and the optical axis of the second optical film 42 is clarified. For example, when the power is at the trough position, it is proved that the optical axis of the first optical film 41 (for example, the fast axis 45°) is aligned with the reflection optical axis of the second optical film 42; when the power is at the peak position, it is proved that the optical axis of the first optical film 41 (for example, the fast axis 45°) is aligned with the transmission optical axis of the second optical film 42.

[0086] In one embodiment, determining the key power feature according to the relationship model specifically includes:

[0087] The power of the light received by the first light detector 2 when it is at a peak position or a trough position is a key power feature.

[0088] In this embodiment, in the relationship model between power and rotation angle, the power at the peak position and the power at the trough position are both key power characteristics, wherein the power at the trough position is optionally used as the key power characteristic. Therefore, when the first optical film 41 is controlled to rotate for the second time, the lowest power point is easily detected, which is more conducive to the alignment of the optical axis of the first optical film 41 and the optical axis of the second optical film 42.

[0089] In one embodiment, before emitting laser light to the optical film assembly so that the laser light passes through the circular polarizer 11 to emit circularly polarized light, the process further includes:

[0090] Laser is emitted to the optical film assembly, and is divided into a first laser and a second laser by a beam splitter 12 . The first laser emits circularly polarized light by passing through the circular polarizer 11 , and the second laser is received by the second light detector 3 .

[0091] In this embodiment, before the laser passes through the circularly polarized light, the laser also passes through the beam splitter 12, and the beam splitter 12 splits the laser into a first laser and a second laser, wherein the first laser can be reflected by the beam splitter 12 and pass through the circular polarizer 11, and the second laser is transmitted by the beam splitter 12 and then received by the second light detector 3. For example, the splitting ratio of the beam splitter 12 can be 50:50 or 30:70, etc.

[0092] For example, a laser is projected onto the beam splitter 12 , and the laser is split into a first laser and a second laser by the beam splitter 12 . The second laser is incident on the second light detector 3 , and the second light detector 3 monitors the energy change of the light beam in real time to eliminate the fluctuation of the energy of the laser itself emitted by the light source body 10 .

[0093] According to a second aspect of the embodiment of the present application, an optical axis alignment device for an optical film assembly is provided. Figure 2 The optical axis alignment device of the optical film assembly adopts the optical axis alignment method of the optical film assembly as described above to achieve the optical axis alignment of the first optical film 41 and the second optical film 42;

[0094] The optical axis alignment device of the optical film assembly comprises:

[0095] A light source assembly, wherein the light source assembly emits circularly polarized light;

[0096] The first light detector 2 is used for receiving the light emitted from the second optical film 42 .

[0097] In this embodiment, the optical axis alignment device of the optical film assembly includes a light source assembly and a first light detector 2, and the first optical film 41 and the second optical film 42 are arranged between the light source assembly and the first light detector 2, wherein the first optical film 41 is arranged closer to the light source assembly than the second optical film 42, so that the circularly polarized light emitted by the light source assembly passes through the first optical film 41 and the second optical film 42 in sequence and then is received by the first light detector 2.

[0098] In one embodiment, the light source assembly includes a light source body 10 and a circular polarizer 11;

[0099] The light source body 10 emits laser light;

[0100] The circular polarizer 11 converts the laser light into circularly polarized light.

[0101] In this embodiment, the light source assembly includes a light source body 10 and a circular polarizer 11. The light source body 10 emits laser light, for example, the light source body 10 may be a laser. The circular polarizer 11 receives the laser light and changes the polarization state of the laser light to convert the laser light into circularly polarized light. The circularly polarized light passes through the first optical film 41 and the second optical film 42 in sequence and is received by the first light detector 2.

[0102] In one embodiment, the light source assembly further includes a beam splitter 12 , which is located between the light source body 10 and the circular polarizer 11 , and the beam splitter 12 splits the laser into a first laser and a second laser, and the first laser is transmitted to the circular polarizer 11 .

[0103] In this embodiment, the light source assembly also includes a beam splitter 12, which is located between the light source body 10 and the circular polarizer 11, and splits the laser emitted by the light source body 10, so as to align the optical axis of the first optical film 41 and the optical axis of the second optical film 42 while ensuring the stability of the laser energy emitted by the light source body 10.

[0104] In one embodiment, the optical axis alignment device of the optical film assembly further includes a second light detector 3, and the second light detector 3 receives the second laser.

[0105] In this embodiment, the optical axis alignment device of the optical film assembly also includes a second light detector 3, which receives the second laser to monitor the energy of the second laser in real time to eliminate the possibility that the energy change of the light monitored by the first light detector 2 is due to the energy fluctuation of the light source body 10 itself.

[0106] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0107] 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 only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for aligning the optical axis of an optical film assembly, characterized in that: The optical film assembly includes a first optical film and a second optical film, wherein the first optical film is a phase delay film, and the second optical film can selectively allow polarized light to pass through; The optical axis alignment method of the optical film assembly comprises: emitting circularly polarized light toward the optical film assembly, the circularly polarized light sequentially passing through the first optical film and the second optical film, and being received by a first light detector; controlling the first optical film to rotate for the first time; Establishing a relationship model between power and rotation angle according to the change of the power of light received by the first light detector as the first optical film rotates at an angle; The first optical film is controlled to rotate for a second time according to the relationship model so that the optical axis of the first optical film and the optical axis of the second optical film are aligned.

2. The optical axis alignment method of an optical film assembly according to claim 1, characterized in that: The step of emitting circularly polarized light to the optical film assembly specifically comprises: The laser is emitted to the optical film assembly so that the laser passes through the circular polarizer to emit circularly polarized light.

3. The optical axis alignment method of an optical film assembly according to claim 1, characterized in that: The relationship model satisfies a sine function.

4. The optical axis alignment method of an optical film assembly according to claim 1, characterized in that: Controlling the rotation of the first optical film for the second time according to the relationship model specifically includes: determining key power characteristics according to the relationship model; The first optical film is controlled to rotate for a second time so that the power of the light received by the first light detector meets a key power characteristic.

5. The optical axis alignment method of an optical film assembly according to claim 4, characterized in that: Determining the key power characteristics according to the relationship model specifically includes: The power of the light received by the first light detector when it is at a peak position or a trough position is a key power feature.

6. The optical axis alignment method of an optical film assembly according to claim 2, characterized in that: The step of emitting laser light to the optical film assembly so that the laser light passes through the circular polarizer to emit circularly polarized light also includes: Laser is emitted to the optical film assembly, and the laser is divided into a first laser and a second laser through a beam splitter. The first laser emits circularly polarized light through the circular polarizer, and the second laser is received by a second light detector.

7. An optical axis alignment device for an optical film assembly, characterized in that: The optical axis alignment device of the optical film assembly adopts the optical axis alignment method of the optical film assembly as described in any one of claims 1 to 6 to achieve the optical axis alignment of the first optical film and the second optical film; The optical axis alignment device of the optical film assembly comprises: A light source assembly, wherein the light source assembly emits circularly polarized light; A first light detector is used to receive the light emitted from the second optical film.

8. The optical axis alignment device of an optical film assembly according to claim 7, characterized in that: The light source assembly comprises a light source body and a circular polarizer; The light source body emits laser light; The circular polarizer converts the laser light into circularly polarized light.

9. The optical axis alignment device of an optical film assembly according to claim 8, characterized in that: The light source assembly further includes a beam splitter, which is located between the light source body and the circular polarizer. The beam splitter splits the laser into a first laser and a second laser, and the first laser is transmitted to the circular polarizer.

10. The optical axis alignment device of an optical film assembly according to claim 9, characterized in that: The optical axis alignment device of the optical film assembly also includes a second light detector, which receives the second laser.

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