Imaging module and head-mounted display device

Abstract

The embodiment of the invention provides an imaging module and head-mounted display equipment. The imaging module comprises a display screen, light rays emitted from different positions of the display screen comprise main light rays located in the center, the main light rays are emitted from the display screen at preset angles, and the range of the preset angles is 85-95 degrees; the imaging lens group is arranged in the light emitting direction of the display screen; wherein under the condition that the display screen moves along the normal direction of the surface of the screen, the main light passes through the center of the exit pupil position.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and more specifically, relate to an imaging module and a head-mounted display device. Background Art

[0002] When adjusting the focal length of a traditional zoom augmented reality (AR) module, the field of view (FOV) of the optical module will change accordingly, which in turn causes differences in image distortion. To address this problem, a common strategy is to use subsequent software algorithms to correct the resulting image distortion.

[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 this application is to provide a new technical solution for an imaging module and a head-mounted display device.

[0005] In a first aspect, an embodiment of the present application provides an imaging module. The imaging module includes:

[0006] A display screen, wherein the light rays emitted from different positions of the display screen include a main light ray located at the center, and the main light rays are emitted from the display screen at a predetermined angle, and the predetermined angle range is: 85° to 95°;

[0007] An imaging lens group, wherein the imaging lens group is arranged in the light emitting direction of the display screen;

[0008] Wherein, when the display screen moves along the normal direction of the screen surface, the main light rays all pass through the central area of ​​the exit pupil position.

[0009] Optionally, the imaging module includes an aperture, the aperture is located at the exit pupil position, and the main light rays all pass through the center of the aperture.

[0010] Optionally, the predetermined angle is 90°.

[0011] Optionally, the adjustment range of the virtual image distance of the imaging module is: 0D~7D.

[0012] Optionally, the size range of the display screen is: 0.3 inches to 1.03 inches.

[0013] Optionally, the display screen is an OLED screen.

[0014] Optionally, a polarizing film is provided between the display screen and the imaging lens group, and the imaging lens group includes a polarizing reflective film;

[0015] The transmission axis of the polarizing film is parallel to the reflection axis of the polarizing reflective film.

[0016] Optionally, the imaging lens group comprises: a first lens having a front surface close to the exit pupil position and a rear surface away from the exit pupil position;

[0017] The front surface of the first lens is used to totally reflect the light received from the outside, and the front surface of the first lens transmits the light reflected by the rear surface of the first lens.

[0018] Optionally, the principal light totally reflected by the front surface of the first lens is transmitted to the rear surface of the first lens, and an emission angle of the principal light reflected by the rear surface of the first lens is less than or equal to 5°.

[0019] Optionally, the imaging lens group further includes a second lens, which is located on the light incident side of the first lens, and the second lens transmits the light transmitted by the display screen into the first lens through the upper surface of the first lens.

[0020] Optionally, the imaging lens group further includes a third lens, the rear surface of the first lens and the front surface of the third lens are cemented to form a zero optical focal length cemented lens group, and the cemented lens group is configured to transmit external ambient light.

[0021] In a second aspect, an embodiment of the present application provides a head mounted display device. The head mounted display device comprises:

[0022] The imaging module as described in the first aspect;

[0023] A shell, wherein the imaging module is arranged in the shell.

[0024] According to the embodiments of the present application, the main light rays emitted from different positions of the display screen are all emitted at preset angles, that is, the main light rays emitted from different positions of the display screen are all emitted in parallel or substantially parallel manners. In the process of the display screen moving along the normal direction of the screen surface, the incident angles of the main light rays emitted from different positions of the display screen to the imaging lens group are unchanged, thereby ensuring that the field of view angle and distortion of the imaging module will not change during the movement of the display screen, thereby ensuring the consistency of the imaging quality.

[0025] 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

[0026] 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.

[0027] Figure 1 Shown is a structural diagram of the imaging module provided in an embodiment of the present application.

[0028] Figure 2 Shown is a schematic diagram of imaging module zoom provided in an embodiment of the present application.

[0029] Figure 3 Shown is the modulation transfer function MTF curve of the imaging module provided in an embodiment of the present application at 450nm.

[0030] Figure 4 Shown is the modulation transfer function MTF curve of the imaging module provided in an embodiment of the present application at 540nm.

[0031] Figure 5 Shown is the modulation transfer function MTF curve of the imaging module provided in an embodiment of the present application at 610nm.

[0032] Description of reference numerals:

[0033] 1. Display screen; 10. Polarizing film;

[0034] 21. first lens; 22. second lens; 23. third lens; 24. polarized reflective film;

[0035] 3. Aperture. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The present application embodiment provides an imaging module, referring to Figure 1 and Figure 2 The imaging module comprises: a display screen 1, wherein light rays emitted from different positions of the display screen 1 include a main light ray located at the center, and the main light rays are emitted from the display screen 1 at a predetermined angle, and the predetermined angle range is: 85° to 95°. An imaging lens group, wherein the imaging lens group is arranged in the light emitting direction of the display screen 1.

[0042] Wherein, when the display screen 1 moves along the normal direction of the screen surface, the main light rays all pass through the center of the exit pupil position.

[0043] The imaging process of the imaging module is as follows: the display screen 1 of the imaging screen emits light, and the light is directed to the imaging lens group. The imaging lens group is used to transmit the light from the display screen 1 and form an image through the human eye at the exit pupil position.

[0044] Each pixel of the display screen 1 is a light-emitting unit. The light emitted by the light-emitting unit forms a conical diffused light. The light includes the main light and the edge light. The edge light is around the main light and the intensity of the edge light is weak. The main light occupies most of the intensity of the diffused light. Controlling the emission angle of the main light is equivalent to controlling the emission angle of all the light on the display screen 1. Therefore, ensuring the emission angle of the main light ensures the emission angle of the entire light.

[0045] The imaging lens group is located in the light-emitting direction of the display screen 1. The function of the imaging lens group is to amplify and analyze the light. The light-emitting surface area of ​​the display screen 1 is small. In order to ensure that the user obtains the magnified display image, the light needs to be amplified. The imaging lens group ensures that the user obtains a recognizable magnified image. Among them, the imaging lens can be a single lens or a combination of multiple lenses.

[0046] In this embodiment, the main light emitted from different positions of the display screen 1 has an angle of 90°±5°. It can also be understood that the main light emitted from different positions of the display screen 1 has an angle of 90°±5°, and the light emitted from different positions of the display screen 1 is parallel or substantially parallel.

[0047] Exemplarily, A, B, and C are light-emitting units at different positions on the display screen 1, A1 is the main light emitted by the light-emitting unit A, B1 is the main light emitted by the light-emitting unit B, and C1 is the main light emitted by the light-emitting unit C.

[0048] When the display screen 1 moves along the normal direction of the screen surface, the imaging module is zoomed. The main light beams A1, B1, and C1 emitted by the light-emitting units at different positions of the display screen 1 are all emitted from the display screen 1 at a preset angle. When the display screen 1 moves along the normal direction of the screen surface, the positions of the light-emitting units A, B, and C on the display screen 1 remain unchanged, and the light-emitting angles of the main light beams A1, B1, and C1 emitted by them remain basically unchanged. Even if the light-emitting angles of the main light beams A1, B1, and C1 change, the light-emitting angle range before and after the change is controlled within a relatively small range (within 10°, or even within 5°).

[0049] Since the principal light rays A1, B1, C1 are emitted from the display screen 1 at an emission angle of 90°±5°, and the display screen 1 moves along the normal direction of the screen surface of the display screen 1, the incident angles of the principal light rays A1, B1, C1 when entering the imaging lens group are basically unchanged (even if the incident angles of the principal light rays A1, B1, C1 when entering the imaging lens group change due to the change of their emission angles, the angle change range is also within a smaller range), so the transmission paths of the principal light rays A1, B1, C1 in the imaging lens group are basically unchanged, that is, no matter where the display screen 1 moves to, the principal light rays A1, B1, C1 emitted from the display screen can enter the human eye from the center of the exit pupil position, that is, the incident angles of the principal light rays A1, B1, C1 entering the human eye are basically unchanged.

[0050] Therefore, when the display screen 1 moves along the normal direction of the screen surface, the emission angle of the main light corresponding to the same light-emitting unit of the display screen 1 remains basically unchanged, and the incident angle entering the human eye remains basically unchanged, so the FOV and distortion of the imaging module remain basically unchanged.

[0051] In the embodiment of the present application, the main light emitted from different positions of the display screen 1 is emitted at a preset angle, that is, the main light emitted from different positions of the display screen 1 is emitted in a parallel or substantially parallel manner. In the process of the display screen 1 moving along the normal direction of the screen surface, the incident angle of the main light emitted from different positions of the display screen 1 to the imaging lens group is unchanged, thereby ensuring that the field of view angle and distortion of the imaging module will not change during the movement of the display screen 1, thereby ensuring the consistency of the imaging quality.

[0052] In one embodiment, referring to Figure 1 and Figure 2 The imaging module includes an aperture 3, the aperture 3 is located at the exit pupil position, and the main light passes through the center of the aperture 3.

[0053] In this embodiment, the display screen 1 can be moved along the normal direction of its surface, so the design of the aperture 3 being located at the exit pupil position can ensure that no matter where the screen is located, the main light can accurately pass through the center of the aperture 3. This helps to maintain the stability and consistency of the imaging module at different screen positions.

[0054] In a preferred embodiment, the predetermined angle is 90°.

[0055] In this embodiment, the main light rays emitted from different positions of the display screen 1 are all emitted perpendicular to the display screen 1, and the display screen 1 moves between the positions 1-1 and 1-2 along the normal direction of the screen surface.

[0056] The main light rays A1, B1, C1 emitted by the light-emitting units A, B, C on the display screen 1 are perpendicular to the display screen 1, so when the display screen 1 moves along the normal direction of the light-emitting surface of the screen, the positions of the light-emitting units A, B, C on the display screen 1 remain unchanged, and the light-emitting angles of the main light rays A1, B1, C1 emitted by them remain unchanged. Therefore, the transmission paths of the main light rays A1, B1, C1 in the imaging lens group remain unchanged, and the incident angles entering the human eye remain unchanged.

[0057] Therefore, when the display screen 1 moves along the normal direction of the screen's luminous surface, the light emission angle of the main light corresponding to the same pixel on the screen surface remains unchanged, and the incident angle entering the human eye remains unchanged, so the FOV and distortion of the imaging module remain unchanged.

[0058] In one embodiment, the adjustment range of the virtual image distance of the imaging module is: 0D~7D.

[0059] Specifically, the imaging module is a variable-focus imaging module, and the imaging module zoom is achieved by moving the display screen 1 along the normal direction of its light-emitting surface to achieve focusing of the imaging module.

[0060] The display screen 1 moves along the normal direction of the screen surface, which means that the display screen 1 has the ability to move in a direction perpendicular to the screen surface (ie, the normal direction). Here, it means that the display screen 1 can move forward or backward to achieve the purpose of focusing.

[0061] When the display screen 1 moves in a direction perpendicular to the screen surface, the adjustment range of VID is from 0 to 7 diopters (D). In this embodiment, diopters are used to describe the focusing range of the imaging module. The imaging module can focus within a fairly large range to adapt to different screen distances and imaging requirements.

[0062] In one embodiment, the size of the display screen 1 ranges from 0.3 inches to 1.03 inches.

[0063] In this embodiment, by limiting the size of the display screen 1, it can be seen that the display screen 1 in the imaging module is a smaller screen, and on a smaller screen size, a finer image display can be achieved by improving the resolution and pixel density. This helps to improve the clarity and detail of the image, so that users can get a good visual experience even on a smaller screen.

[0064] In one embodiment, the display screen 1 is an OLED screen.

[0065] In this embodiment, the type of the display screen 1 is limited to an OLED screen, so that the emission angles of the main light emitted from different positions of the display screen 1 are limited to within the range of 85° to 95°.

[0066] Specifically, the light-emitting layer of OLED (organic light-emitting diode) is designed so that the light emission is isotropic, that is, the light is emitted uniformly in all directions. However, in order to control the direction of the light and make it emit forward, OLED screens usually use special optical designs, such as microlens arrays or light guide structures. This design allows the light to propagate mainly in a direction perpendicular to the screen when emitted, which means that the emission angle of the main light emitted from different positions of the display screen 1 is within a preset range, and the architecture of the imaging module is an image-side telecentric architecture.

[0067] In one embodiment, a polarizing film 10 is disposed between the display screen 1 and the imaging lens group, and the imaging lens group includes a polarizing reflective film 24;

[0068] The transmission axis of the polarizing film 10 is parallel to the reflection axis of the polarizing reflective film 24 .

[0069] In this embodiment, the transmission axis of the polarizing film 10 and the reflection axis of the polarizing reflective film 24 are designed to be parallel. This means that the light transmitted from the light-emitting side of the display screen 1 and in accordance with the transmission axis of the polarizing film 10 is incident on the polarizing reflective film 24 and is reflected by the polarizing reflective film 24 back to the front surface of the first lens 21, without changing the polarization direction of the light during the whole process. That is, the polarization direction of the light allowed to be transmitted by the polarizing film 10 is consistent with the polarization direction of the light allowed to be reflected by the polarizing reflective film 24.

[0070] Due to the parallel configuration of the polarizing film 10 and the polarizing reflective film 24, only light with a specific polarization direction can propagate in the optical module, which helps to reduce the interference of stray light and reflected light on the image, thereby improving the contrast of the image.

[0071] Exemplarily, a polarizing reflective film 24 is disposed on the rear surface of the first lens 21 , or when the first lens 21 and the third lens 23 are glued together, a polarizing reflective film 24 can be disposed between the first lens 21 and the third lens 23 , or a polarizing reflective film 24 is disposed on the front surface of the third lens 23 .

[0072] In a specific embodiment, referring to Figure 1 and Figure 2 , the structure of the imaging lens group is limited, wherein the imaging lens group needs to meet the following conditions: after receiving the image light appearing on the display screen 1, the imaging lens group transmits the image light, and the main light transmitted by the imaging lens group can pass through the center of the aperture 3. In this way, when the display screen 1 moves along the optical axis of its main light, the field of view of the entire imaging module will not change much, and the image distortion formed by the imaging module is small.

[0073] Specifically, the imaging lens group includes: a first lens 21, wherein the first lens 21 has a front surface close to the exit pupil position and a rear surface away from the exit pupil position;

[0074] The front surface of the first lens 21 is used to totally reflect the light received from the outside, and the front surface of the first lens 21 is used to transmit the light reflected by the rear surface of the first lens 21 .

[0075] In this embodiment, the imaging lens group mainly includes a first lens 21, and the first lens 21 has two main surfaces: a front surface close to the exit pupil position and a rear surface away from the exit pupil position. In the imaging module applied to the AR display device, the front surface of the first lens 21 is arranged close to the human eye, and the rear surface of the first lens 21 is arranged away from the human eye.

[0076] The front surface of the first lens 21 is designed to be able to fully reflect the light received from the outside. This means that when light is incident on the front surface of the first lens 21 at a specific angle, the light will be completely reflected back into the first lens 21 without penetrating the lens or causing significant refraction, which provides a basis for the imaging lens group to turn the light, so that the light can be propagated and processed inside the imaging lens group according to a predetermined path, thereby improving the image quality. In other words, in this embodiment, the imaging lens group transmits the image light by folding (turning) the light path.

[0077] Exemplarily, the source of the external light may be image light emitted from the display screen 1 , or light transmitted to the inside of the first lens 21 by other lenses.

[0078] In addition to total reflection of light, the front surface of the first lens 21 can also transmit light reflected from the rear surface of the first lens 21. This means that when light undergoes a series of reflections inside the imaging lens group and finally reaches the front surface of the first lens 21, the light will be transmitted and enter the human eye.

[0079] The rear surface of the first lens 21 is designed mainly to cooperate with the front surface to achieve reflection of image light.

[0080] Therefore, in this embodiment, the first lens 21 can maximize the use of light and reduce light loss through the combination of total reflection and transmission. In addition, the first lens 21 can accurately control the propagation path of light, which helps to achieve clearer image display and reduce image distortion and blur.

[0081] In a specific embodiment, in order to further ensure that the main light emitted from different positions of the display screen 1 can pass through the center of the exit pupil position (aperture 3), the imaging lens group includes a first lens 21. The first lens 21 is the lens closest to the exit pupil position. After the main light emitted from different positions of the display screen 1 is transmitted, it will eventually enter the human eye through the transmission of the front surface of the first lens 21. Therefore, this embodiment limits the exit angle of the main light transmitted to the rear surface of the first lens 21. According to the principle of light reflection, the light reflected by the rear surface of the first lens 21 can pass through the center of the exit pupil position (aperture 3) through the transmission of the front surface of the first lens 21.

[0082] Specifically, refer to Figure 1 and Figure 2 The principal light ray totally reflected by the front surface of the first lens 21 is transmitted to the rear surface of the first lens 21, and the emission angle of the principal light ray reflected by the rear surface of the first lens 21 is less than or equal to 5°.

[0083] In this embodiment, the main light emitted from the display screen 1 is projected onto the front surface of the first lens 21 at an incident angle greater than or equal to the critical angle, and is then totally reflected by the front surface of the first lens 21 .

[0084] Next, the totally reflected principal light is transmitted to the rear surface of the first lens 21, wherein the totally reflected principal light is incident on the rear surface of the first lens 21 at an incident angle less than or equal to 5°. The rear surface of the first lens 21 can reflect the light transmitted thereto by attaching a polarizing reflective film 24. According to the principle of light reflection, the angle of incidence of the principal light reflected by the rear surface of the first lens 21 is also less than or equal to 5°. With such a design, the direction of the principal light emitted from different positions of the display screen 1 after two reflections (once on the front surface and once on the rear surface) is precisely controlled, so that it can pass through the front surface and point to the center of the aperture 3. This design further ensures that the imaging module is an image-side telecentric structure. When the display screen 1 moves along the direction perpendicular to its light-emitting surface, the changes in the FOV and distortion of the imaging module are very small, which can ensure the consistency of imaging quality.

[0085] It should be noted that by precisely controlling the reflection direction of the light on the rear surface, as well as the shapes, positions and relative relationship between the front and rear surfaces, it is possible to ensure that the reflected main light can pass through the front surface again and accurately point to the center of the aperture 3. This design is also generally used to ensure the symmetry of the optical system, reduce aberrations, and optimize the focusing or imaging performance of the light.

[0086] Further, continue to refer to Figure 1 and Figure 2 The imaging lens group also includes a second lens 22, which is located on the light incident side of the first lens 21, and the second lens 22 transmits the light transmitted by the display screen 1 to the first lens 21 through the upper surface of the first lens 21.

[0087] In this embodiment, in order to further ensure the imaging quality of the imaging lens group, illustratively, in order to improve the MTF value of the imaging lens group, a second lens 22 is arranged on the light incident side of the first lens 21 group.

[0088] Specifically, the first lens 21 is a prism, and the first lens 21 includes a front surface close to the exit pupil position, a rear surface away from the exit pupil position, and an upper surface connected to the front surface and the rear surface. The second lens 22 is actually located between the upper surface of the first lens 21 and the display screen 1.

[0089] The main function of the second lens 22 is to effectively transmit the light transmitted by the display screen 1 to the inside of the first lens 21 through the upper surface of the first lens 21. This requires the second lens 22 to have specific optical properties, such as appropriate focal length, curvature, etc., to ensure that the light can be transmitted in an expected manner.

[0090] For example, when the second lens 22 is properly disposed between the screen and the first lens 21, the second lens 22 can further focus, diffuse or adjust the direction of the light emitted from the screen. Such adjustment helps to optimize the propagation path of the light, reduce aberrations, and thus improve the contrast and clarity of the image.

[0091] For further information, please refer to Figure 1 and Figure 2 The imaging lens group also includes a third lens 23, the rear surface of the first lens 21 and the front surface of the third lens 23 are glued together to form a zero optical focal length glued lens group, and the glued lens group is configured to transmit external ambient light.

[0092] When the imaging module is applied to an AR display device, the AR display device can project virtual images and real-world images into the human eye at the same time, which requires the imaging module to not only transmit the image light emitted by the display screen 1, but also the external environment light.

[0093] In this embodiment, the imaging lens group includes a third lens 23. The third lens 23 and the first lens 21 are glued together to form a glued lens group for transmitting external ambient light.

[0094] Since the overall focal length of the cemented lens group is zero, zero focal length means that the cemented lens group has no convergence or divergence effect on the light, that is, the ambient light from the outside world still maintains its original direction after passing through the cemented lens group. This helps to maintain the original proportion and shape of the image and avoid distortion or deformation.

[0095] In addition, the imaging lens group also needs to transmit the image light emitted from the display screen 1. When the first lens 21 and the third lens 23 are glued together, a polarizing reflective film 24 can be set on the glued surface of the first lens 21 and the third lens 23. The polarizing reflective film 24 can reflect the image light emitted from the display screen 1, and the polarizing reflective film 24 can project the external ambient light. In this way, when the display screen 1 emits light, these lights do not pass through the third lens 23, that is, the light emitted by the display screen 1 will not be affected by the third lens 23 (or the impact is very small), but will be transmitted to the final observation or imaging position through other paths (such as directly through the front surface of the first lens 21). In this way, by gluing the rear surface of the first lens 21 and the front surface of the third lens 23 to form a glued lens group with zero optical focal length, and specially configuring the third lens 23 not to transmit the light emitted from the screen, the imaging lens group can achieve effective transmission of external image light and non-interference processing of screen light.

[0096] Exemplarily, the third lens 23 is a prism.

[0097] In a specific embodiment, the imaging module includes a display screen 1, and a polarizing film 10 is arranged on one side of the display screen 1. The imaging lens group includes: a first lens 21, a second lens 22 and a third lens 23, wherein the first lens 21 and the third lens 23 are glued together, and a polarizing reflective film 24 is arranged on the glued surface of the first lens 21 and the third lens 23. The imaging module also includes a stop 3. Table 1 is a structural parameter table included in the imaging module.

[0098] Table 1:

[0099]

[0100] Figure 3 , Figure 4 , Figure 5 The modulation transfer function (MTF) curves of the AR module at 450nm, 540nm, and 610nm respectively.

[0101] It can be seen from the figure that at a spatial frequency of 15lp / mm, reference Figure 3 , at 450nm wavelength, the MTF value is higher than 0.7; refer to Figure 4 , at 540nm wavelength, the MTF value is higher than 0.7; reference Figure 5 , at a wavelength of 610nm, the MTF is higher than 0.7.

[0102] In a second aspect, an embodiment of the present application provides a head mounted display device. The head mounted display device comprises:

[0103] The imaging module as described in the first aspect;

[0104] A shell, wherein the imaging module is arranged in the shell.

[0105] In this embodiment, the housing can provide an installation space for supporting the imaging module, and the imaging module is arranged in the housing. Exemplarily, the head-mounted display device can be AR glasses, or an AR head-mounted device.

[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. An imaging module, characterized in that: include: A display screen (1), wherein light rays emitted from different positions of the display screen (1) include a main light ray located at the center, and the main light rays are emitted from the display screen (1) at a predetermined angle, and the predetermined angle range is: 85° to 95°; An imaging lens group, the imaging lens group being arranged in the light emitting direction of the display screen (1); Wherein, when the display screen (1) moves along the normal direction of the screen surface, the main light rays all pass through the center of the exit pupil position.

2. The imaging module according to claim 1, characterized in that: The imaging module comprises an aperture (3), the aperture (3) is located at the exit pupil position, and the main light rays all pass through the center of the aperture (3).

3. The imaging module according to claim 1, characterized in that: The predetermined angle is 90°.

4. The imaging module according to claim 1, characterized in that: The adjustment range of the virtual image distance of the imaging module is: 0D~7D.

5. The imaging module according to claim 1, characterized in that: The size range of the display screen (1) is 0.3 inches to 1.03 inches.

6. The imaging module according to claim 1, characterized in that: The display screen (1) is an OLED screen.

7. The imaging module according to claim 1, characterized in that: A polarizing film (10) is arranged between the display screen (1) and the imaging lens group, and the imaging lens group includes a polarizing reflection film (24); The transmission axis of the polarizing film (10) is parallel to the reflection axis of the polarizing reflection film (24).

8. The imaging module according to any one of claims 1 to 7, characterized in that: The imaging lens group comprises: a first lens (21), the first lens (21) having a front surface close to the exit pupil position and a rear surface away from the exit pupil position; The front surface of the first lens (21) is used to totally reflect light received from the outside, and the front surface of the first lens (21) is used to transmit light reflected by the rear surface of the first lens (21).

9. The imaging module according to claim 8, characterized in that: The main light beam totally reflected by the front surface of the first lens (21) is transmitted to the rear surface of the first lens (21), and the emergence angle of the main light beam reflected by the rear surface of the first lens (21) is less than or equal to 5°.

10. The imaging module according to claim 8, characterized in that: The imaging lens group further comprises a second lens (22), the second lens (22) being located on the light incident side of the first lens (21), and the second lens (22) being configured to transmit light transmitted by the display screen (1) into the first lens (21) through the upper surface of the first lens (21).

11. The imaging module according to claim 10, characterized in that: The imaging lens group also includes a third lens (23), the rear surface of the first lens (21) and the front surface of the third lens (23) are glued together to form a glued lens group with zero optical focal length, and the glued lens group is configured to transmit external ambient light.

12. A head mounted display device, characterized in that: The head mounted display device comprises: The imaging module as claimed in any one of claims 1 to 11; A shell, wherein the imaging module is arranged in the shell.

Images