CN218446224U - Optical module and head-mounted display equipment - Google Patents
Optical module and head-mounted display equipment Download PDFInfo
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- CN218446224U CN218446224U CN202221957737.9U CN202221957737U CN218446224U CN 218446224 U CN218446224 U CN 218446224U CN 202221957737 U CN202221957737 U CN 202221957737U CN 218446224 U CN218446224 U CN 218446224U
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Abstract
The embodiment of the application provides an optical module and a head-mounted display device. The optical module includes: a display screen having a size D1; a lens group comprising at least one lens; the optical module further comprises a polarizing element, a light splitting element and a phase retarder, wherein the effective aperture of the polarizing element is B1; the polarization element, the beam splitting element and the phase retarder are arranged on any side of a lens in the lens group; the distance from the polarizing element to the display screen is L1; wherein the optical module satisfies: -0.2 < (B1/2-D1/2)/L1 < 0.8.
Description
Technical Field
The embodiment of the application relates to the technical field of near-eye display imaging, in particular to an optical module and a head-mounted display device.
Background
In recent years, augmented Reality (AR) technology, virtual Reality (VR) technology, and the like have been applied to, for example, smart wearable devices and have been rapidly developed. The core components of the augmented reality technology and the virtual reality technology are optical modules. The quality of the optical module for displaying the image effect can directly determine the quality of the intelligent wearable device.
In the current VR design, the screens mainly used are LCD and OLED, and such screens generally have the problem that the brightness of the image changes with the change of the viewing angle, and specifically, the brightness of the image decreases with the increase of the viewing angle.
When the screen is used for a VR optical module, when a user observes images at different visual angles, due to the fact that the incident light angles are different at different visual angles, the brightness of the screen changes along with the change of the observation angle, the brightness of the images also changes along with the brightness of the screen, and the relative brightness of the images is in strong contrast.
SUMMERY OF THE UTILITY MODEL
The utility model provides an aim at provides an optical module and wear display device's new technology scheme.
In a first aspect, the present application provides an optical module comprising:
a display screen having a size D1;
a lens group comprising at least one lens;
the optical module further comprises a polarizing element, a light splitting element and a phase retarder, wherein the effective aperture of the polarizing element is B1; the polarization element, the beam splitting element and the phase retarder are arranged on any side of a lens in the lens group;
the distance from the polarizing element to the display screen is L1;
wherein the optical module satisfies: 0.2 < (B1/2-D1/2)/L1 < 0.8.
Optionally, the optical module satisfies: -0.05 < (B1/2-D1/2)/L1 < 0.8.
Optionally, the optical module satisfies: beta is more than 7.5 and less than 19, wherein beta is the field magnification.
Optionally, the lens group includes a lens disposed adjacent to the display screen, the lens having a surface facing the display screen, the light splitting element being located on one side of the surface.
Optionally, the polarizing element is disposed on a side of the lens group facing away from the display screen; or alternatively
The lens group comprises at least two lenses including a first lens closest to the human eye side, wherein the first lens has a surface arranged to face away from the human eye, and the polarizing element is located at one side of the surface.
Optionally, the phase retarder comprises a first phase retarder disposed on a side of the lens group facing away from the display screen, and the first phase retarder is disposed closer to the display screen relative to the polarizing element;
the lens group includes at least two lenses including a first lens closest to a human eye side, wherein the first lens has a surface disposed away from the human eye, the first phase retarder is located on a side of the surface, and the first phase retarder is disposed farther away from the first lens relative to the polarizing element.
Optionally, the phase retarder further comprises a second phase retarder, the lens group comprising a lens disposed adjacent to the display screen, the lens having a surface facing the display screen, the second phase retarder being located at one side of the surface, the second phase retarder being disposed closer to the display screen relative to the light splitting element.
Optionally, the lens group comprises a lens disposed adjacent to the display screen, the power of the lens being positive.
Optionally, the distance from the polarizing element to the display screen satisfies: l1 is more than 10mm and less than 35mm.
Optionally, the effective aperture of the polarizing element satisfies: b1 is more than 30mm and less than 55mm.
Optionally, the field angle range of the optical module is 80 ° ≦ FOV ≦ 120 °.
Optionally, the effective focal length range of the optical module is: f is more than 14mm and less than 38.5mm.
In a second aspect, a head mounted display device is provided. The head mounted display device includes:
a housing; and
an optical module according to the first aspect.
According to the embodiment of the application, through the difference between the effective caliber of limiting the optical module and the size of the display screen, and the ratio relation between the effective caliber of limiting the optical module and the size of the display screen and the distance from the polarizing element to the display screen, the relative brightness difference of the images is small when a user observes the images at different visual angles, and the visual watching experience effect of the user is improved.
Other features of the present description and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.
Fig. 1 is a first schematic structural diagram of an optical module according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of an optical module according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of a third optical module according to an embodiment of the present disclosure.
Description of reference numerals:
1. a display screen; 2. a lens group; 21. a first lens; 22. a second lens; 3. a polarizing element; 4. a diaphragm; 5. a light-splitting element; 6. a first phase retarder.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.
Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as 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.
In the prior art, the problem that the brightness of the display screen changes along with the change of the observation angle of a user is solved. At present, the brightness of a local area of a display screen is mainly adjusted through software, or the internal structure of the display screen is improved, so that the proper relative brightness requirement can be met. But the existing approach increases system power consumption and design costs.
Based on the foregoing technical problem, a first aspect of the embodiments of the present application provides an optical module, which is a folded optical path optical structure design, and may include at least one optical lens, and may be suitable for being applied to a Head Mounted Display (HMD), for example, a VR headset, such as a product that may include VR glasses or a VR helmet, and the like, which is not particularly limited in the embodiments of the present application.
The optical module and the head-mounted display device provided by the embodiment of the present application are described in detail below with reference to fig. 1 to 3.
An embodiment of the present application provides an optical module, as shown in fig. 1 to 3, the optical module includes: the display device comprises a display screen 1, a lens group 2, a polarizing element 3, a light splitting element 5 and a phase retarder.
The display screen 1 has a size D1. The lens group 2 comprises at least one lens. The optical module further comprises a polarizing element 3, a light splitting element 5 and a phase retarder, and the effective caliber of the polarizing element 3 is B1. The distance from the polarizing element 3 to the display screen 1 is L1. Wherein the optical module satisfies: -0.2 < (B1/2-D1/2)/L1 < 0.8.
In other words, the optical module mainly includes the display screen 1, the lens set 2, the polarizer 3, the beam splitter 5 and the phase retarder.
Wherein the display screen 1 can be an LCD display screen, an OLED display screen, even if the image brightness of the display screen 1 can change along with the change of the observation angle of a user, the effective caliber B1 of the polarizing element 3, the size D1 of the display screen 1 and the relation of the distance L1 parameter from the polarizing element 3 to the display screen 1 are controlled and limited, so that after the display screen 1 displays an image, the difference between the display brightness in the central area of the display screen 1 and the display brightness in the edge area of the display screen 1 is small, and the display effect is improved.
Wherein the lens group 2 comprises at least one lens, for example as shown with reference to fig. 1-3, the lens group 2 may comprise one lens, two lenses, or three lenses, etc. The optical design of the folded light path is realized through the optical architecture of one lens, two lenses or three lenses. In this embodiment, no matter how the optical structure of the lens group 2 is designed, that is, no matter how the light is folded and transmitted in the folded optical path, the lens closest to the human eye transmits the light to the human eye, and the light can enter the human eye to display an image. Thus, the human eyes can watch the complete picture. In this embodiment, as long as the limitation on the parameter relationship in the embodiment of the present application is satisfied, the difference between the display brightness located in the central region of the display screen 1 and the display brightness located in the edge region of the display screen 1 can be reduced, and human eyes can observe a small brightness difference of an image frame, thereby obtaining a better experience effect.
In order to realize the folded optical path design, a polarization element 3, a light splitting element 5 and a phase retarder are arranged in an optical module. For example, a polarizing element 3, a light splitting element 5, and a phase retarder are provided on either side of the lenses in the lens group 2.
Specifically, in order to realize the folded optical path arrangement, the polarizing element 3, the light splitting element 5, and the phase retarder are disposed on either side of the lenses in the lens group 2. For example, a light splitting element 5 is provided in the lens group 2 on the side facing the display screen 1; a polarizing element 3 is arranged on the side of the lens group 2 facing away from the display screen 1, or a polarizing element 3 is arranged on the side of one lens of the lens group 2; a phase retarder is provided in the lens group 2 on the side facing the display screen 1, or on the side of one lens in the lens group.
Wherein the polarization element 3 is used for transmitting the P polarized light and reflecting the S polarized light; alternatively, a polarizing reflective element may be used to reflect P-polarized light through S-polarized light. Specifically, the polarizing element 3 has a polarization transmission direction, and the light can pass through the polarizing element 3 smoothly when vibrating along the polarization transmission direction, and the vibrating light in the other directions is reflected when encountering the polarizing element 3. For example, the polarizing element 3 may be a polarizing element or a reflective polarizer. In this embodiment, regardless of the position at which the polarizing element 3 is disposed, the distance from the polarizing element 3 to the display screen 1 is defined as L1, and the effective aperture of the polarizing element 3 is defined as B1.
Wherein the phase retarder is operable to change the polarization state of light in the folded optical path structure. For example, it is possible to convert linearly polarized light into circularly polarized light, or to convert circularly polarized light into linearly polarized light. The phase retarder may be, for example, a quarter-wave plate.
Wherein a part of the light is transmitted and another part of the light is reflected when the light passes through the light-splitting element 5, irrespective of the fact that the light is absorbed. For example, light traveling from the display screen 1 to the human eye side can be transmitted through the light splitting element 5, and light traveling from the human eye side to the display screen 1 is reflected on the light splitting element 5. The light splitting element 5 may be a transflective film or a polarizing film.
In this embodiment, the size of the display screen 1 is D1, where the size of the display screen 1 is: the maximum size of a screen for displaying an image picture, for example, the display screen 1 has an area for displaying a picture, the maximum size of the area.
In this embodiment, defining (B1/2-D1/2)/L1 within this range, the brightness uniformity of the displayed image is adjusted (the smaller the difference is, the higher the uniformity is, the larger the difference is, the lower the uniformity is), so that when the user observes the image with small different viewing angles, the brightness difference of the image with different viewing angles is small, that is, when the user observes the image in the central area and the image in the edge area, the brightness difference perceived by the user is small, the eyes of the user do not easily get tired when the user observes the screen, and the user experience is improved.
Specifically, wherein the polarizing element 3 is the most critical and most effective film layer for reflecting light in the folded light path, and the light direction of the edge area of the image on the display screen 1 reflected by the polarizing element 3 can be basically corresponding to the light direction of the edge field in the light source module, specifically, the tangent value of the angle of the edge light is approximate to the difference between the effective aperture B1 of the polarizing element 3 and the size D1 of the display screen 1, and the ratio of the distance L1 from the polarizing element 3 to the display screen 1.
Therefore, in order to better simulate the incident angle of the image emitting light in the display screen 1 (because the incident angle cannot be accurately controlled), the relationship among the effective aperture B1 of the polarizing element 3, the distance L1 from the polarizing element 3 to the display screen 1, and the size D1 of the display screen 1 is defined, so that the relationship between (B1/2-D1/2)/L1 can substantially reflect the relationship between the brightness of the light in the edge field and the brightness of the light in the central field.
Specifically, the (B1/2-D1/2)/L1 is in the range, so that the polarization element 3 and the display screen 1 have a good matching effect, and the effective aperture of the polarization element 3 and the display screen 1 have a good matching effect. Specifically, (B1/2-D1/2)/L1 mainly adjusts the brightness of the edge field, so that the reduction range of the brightness of the edge field relative to the brightness of the central field is controlled within 30%, and the sensitivity of human eyes for observing the brightness of the image is satisfied.
Compare in, carry out the mode that improves through the inner structure to display screen 1 in prior art, and compare in, the mode of adjusting the luminance of display image through the software mode in prior art, this embodiment is through the difference between effective bore of polarization element 3 and the size D1 of display screen 1 in the control optical module, and the ratio relation of the distance of polarization element 3 to display screen 1, can realize that the user is when observing the image under the different visual angles, the relative luminance difference of image is little, user's visual viewing experience effect has been promoted.
In one embodiment, the optical module satisfies: -0.05 < (B1/2-D1/2)/L1 < 0.8.
In this embodiment, the range of (B1/2-D1/2)/L1 in the optical module is further narrowed, wherein the smaller the value of (B1/2-D1/2)/L1 is, the smaller the difference between the image brightness in the central region and the image brightness in the edge region is, i.e. the better the uniformity between the image brightness in the central region and the image brightness in the edge region is.
It should be noted that, in the embodiment of the present application, a person skilled in the art may flexibly adjust, according to specific requirements, a ratio relationship between a difference between an effective aperture of the optical module, where the polarizing element 3 is disposed, and a size of the display screen 1, and a distance from the polarizing element 3 to the display screen 1, as long as the ratio relationship is controlled within a preset range.
For example, (B1/2-D1/2)/L1 may range from 0 to 0.8.
For another example, (B1/2-D1/2)/L1 may be in the range of 0.1 to 0.5.
For another example, (B1/2-D1/2)/L1 may be in the range of-0.1 to 0.1.
Within the range of the ratio, the brightness difference of the image is small when a user visually observes the image picture at different visual angles, and the brightness of the image meets the requirement of homogenization.
Of course, in the embodiment of the present application, the relationship between the difference between the effective aperture of the polarizer 3 and the size of the display screen 1 provided in the optical module and the ratio between the distance from the polarizer 3 to the display screen 1 is not limited to the above three examples, and those skilled in the art can flexibly adjust the relationship according to the needs, and the embodiment of the present application does not specifically limit the relationship.
In one embodiment, the optical module satisfies: beta is more than 7.5 and less than 19, wherein beta is the field magnification.
Specifically, in the VR design, the optical module is applied to VR design, and the amplification of the display image on the display screen 1 is actually realized. Because the virtual image distance that different people experienced when using the VR product obtained exists differently, consequently it is inaccurate to use the ratio of virtual image size and screen display size as the magnifying power who weighs this VR optical module. In addition, it is known that when the optical module is applied to VR design, not only the displayed image but also the viewing angle (for example, magnifying an object with a magnifier) is enlarged, and the enlargement of the viewing angle does not change with the use condition of the user, so that the viewing angle enlargement ratio can be used as a parameter for measuring the enlargement capability of the VR system.
The present embodiment enables the optical module to satisfy the viewing angle magnification requirement from a small display screen 1 size to a large display screen 1 size by defining the range of the viewing angle magnification (vertical axis magnification β) of the optical module.
Specifically, the visual angle magnification (the visual angle magnification of the optical module is related to the magnification of each lens in the lens group 2) is related to the effective aperture of the lens, the focal length of the optical module, and the optical overall length parameter of the optical module, etc., and theoretically determines the performance of the optical module. For example, the larger the effective aperture of the lens, the higher the resolution, the larger the available magnification, the smaller the focal length, and the larger the field of view.
In the embodiment, (B1/2-D1/2)/L1 is limited in the range, the visual angle magnification of the optical module is limited in the range by limiting the effective aperture of the polarizing element 3, limiting the size of the display screen 1 and limiting the distance from the polarizing element 3 to the display screen 1, and under the condition of controlling the brightness of the edge field image, better resolution is provided, the fineness of the display image is improved, and a user has better immersion experience.
For example, the optical module satisfies: 5 < β < 15, and for example an optical module satisfying: 1 < beta < 8, and for example an optical module satisfying: beta is more than 3 and less than 12.
Within the above ratio ranges, on one hand, the difference of the brightness of the image is small when the user visually observes the image at different viewing angles, and on the other hand, better resolution is provided.
In an embodiment, referring to fig. 1-3, the light splitting element 5 is arranged between the display screen 1 and the lens assembly 2.
In this embodiment, the arrangement position of the light splitting element 5 is defined. Wherein the light-splitting element 5 is arranged on the side of the lens group 2 facing the display screen 1.
In a particular embodiment, the lens group 2 comprises the lens closest to the display screen, which has a surface facing the display screen on which the light-splitting element 5 is arranged. For example, the light-splitting element 5 is attached to the surface.
In another particular embodiment, a light-splitting element 5 is arranged between the lens assembly 2 and the display screen 1. For example, a polarizing element carrying the light-splitting element 5 is provided between the lens group 2 and the display screen 1, and the light-splitting element 5 is provided on the polarizing element.
It should be noted that those skilled in the art can appropriately adjust the installation position of the spectroscopic element 5 as necessary.
In one embodiment, referring to fig. 1-3, the polarizing element 3 is arranged on a side of the lens group 2 facing away from the display screen 1; or
The lens group 2 includes at least two lenses, and the polarizing element 3 is disposed between adjacent two lenses.
In this embodiment, referring to fig. 1, the lens group 2 includes one lens, one of which is the first lens 21, and the polarizing element 3 may be disposed on a surface of the first lens 21 on a side facing away from the display screen 1, or the polarizing element 3 may be disposed on a side of the first lens 21 facing away from the display screen 1, but not on a surface of the first lens 21. For example, a polarizing element is provided between the first lens 21 and the human eye, and a polarizing element is provided on the polarizing element.
Referring to fig. 2 and 3, the lens group 2 includes two lenses including a first lens 21 and a second lens 22, wherein the first lens 21 is disposed farther from the display screen 1 than the second lens 22. A polarizing element 3 is arranged on the surface of the first lens 21 facing away from the second lens 22.
It should be noted that those skilled in the art can reasonably adjust the arrangement position of the polarization element 3 according to needs.
In one embodiment, the phase retarder comprises a first phase retarder 6, the first phase retarder 6 being arranged between the polarizing element and a lens of the lens group, or
The lens group includes at least two lenses, and the first phase retarder 6 is disposed between adjacent two lenses.
In this embodiment, referring to fig. 1, a first phase retarder 6 is arranged in the lens group on the side facing away from the display screen 1, a polarizing element 3 is arranged in the lens group 2 on the side facing away from the display screen 1, and the first phase retarder 6 is located between the polarizing element and the lens group. I.e. the first phase retarder 6 is located between the first lens 21 and the polarizing element 3. I.e. the first phase retarder 6 is arranged closer to the display screen 1 than to the polarizing element 3.
Referring to fig. 2 and 3, the lens group 2 includes two lenses including a first lens 21 and a second lens 22, wherein the first lens 21 is disposed farther from the display screen 1 than the second lens 22. A first phase retarder 6 is disposed between the first lens 21 and the second lens 22. For example, the first phase retarder 6 is provided in the second lens 22 on a surface adjacent to the first lens 21; or the first phase retarder 6 is provided in the first lens 21 on a surface adjacent to the second lens 22; or the first phase retarder 6 is disposed at an appropriate position between the first lens 21 and the second lens 22.
It should be noted that those skilled in the art can reasonably adjust the setting position of the first phase delayer 6 according to the needs.
In one embodiment, the phase retarder further comprises a second phase retarder located between the lens group and the display screen.
In this embodiment, the setting position of the second phase retarder is defined, wherein the second phase retarder is located on the light emitting surface side of the display screen, for example, between the lens group and the display screen.
In this embodiment, the lens group comprises a lens disposed adjacent to said display screen, the optical power of said lens being positive.
In this embodiment, the lens group includes a lens disposed adjacent to the display screen, where the power of the lens is positive, and the lens is a magnifying lens that magnifies the light emitted from the display screen.
For example, referring to fig. 1-3, a lens disposed adjacent to a display screen includes a first surface disposed away from the display screen and a second surface disposed toward the display screen, the first surface being planar or concave and the second surface being convex.
In one embodiment, the distance from the polarizing element 3 to the display screen 1 satisfies: l1 is more than 10mm and less than 35mm.
In this embodiment, in the optical module, no matter where the polarizing element 3 is disposed in the optical module, it is necessary that the distance from the polarizing element 3 to the display screen 1 is within this range. In the embodiment, the distance from the polarizer 3 to the display screen 1 is controlled, so that on one hand, the range of (B1/2-D1/2)/L1 is in the range of-0.2-0.8, and the difference between the brightness of the light in the edge field and the brightness of the light in the central field is reduced; on the other hand, the distance from the polarizing element 3 to the display screen 1 is controlled, so that the total optical length of the optical module is limited within a certain range, and the optical module meets the requirements of miniaturization and light weight.
In an alternative embodiment, the distance L from the polarizing element 3 to the display screen 1 is: l1 is more than or equal to 12mm and less than or equal to 20mm; or the distance L from the polarizing element 3 to the display screen 1 is: l1 is more than or equal to 20 and less than or equal to 30.
In one embodiment, the effective aperture of the polarizer 3 is such that: b1 is more than 30mm and less than 55mm.
In this embodiment, the effective aperture of the polarizer 3 is defined such that, on the one hand, the difference between the peripheral field light luminance and the central field light luminance is reduced in the range of-0.2 to 0.8 in the range of (B1/2-D1/2)/L1; on the other hand, after the light is processed by the polarizing element 3, the processed light can better simulate the light of the marginal field of view of the optical module, and the transmission characteristic of the light of the marginal field of view can be better reflected by the (B1/2-D1/2)/L1.
In one embodiment, the optical module has a field of view angle in the range of 80 DEG-120 DEG FOV,
in this embodiment, the angle of view scope of optical module is 80 and is greater than or equal to FOV and is less than or equal to 120, and optical module is applied to VR equipment, and VR equipment has big angle of view. For example, the field angle FOV =100 ° of the optical module.
In one embodiment, the optical module satisfies: f is more than 14mm and less than 38.5mm, wherein F is the effective focal length of the optical module.
Specifically, the optical module is applied to VR design, which actually plays a role in magnifying the image, i.e., the object needs to be moved closer to the eye to see a tiny object or the details of the object clearly, so that the visual angle can be increased to form a larger real image on the retina. However, when the distance between the object and the eye is too short, the object cannot be seen clearly, so that the image should have a sufficiently large field angle to the human eye and should also have an appropriate distance.
Specifically, the viewing angle amplification ratio β =1+250/F is used as a parameter for measuring the amplification capability of the VR system, and the embodiment defines the effective focal length range of the optical module, so that the image sharpness is improved under the condition that the brightness of the marginal field image is controlled.
For example, the optical module satisfies: f is more than 15mm and less than 30mm.
In an alternative embodiment, the size range of the display screen 1 is: d1 is more than or equal to 20mm and less than or equal to 60mm.
In this embodiment, the size range of the display screen 1 is defined such that, on the one hand, the range of (B1/2-D1/2)/L1 is in the range of-0.2-0.8, the difference between the peripheral field light luminance and the central field light luminance is reduced; on the other hand, the VR device is adapted to a small-sized display screen 1 and a large-sized display screen 1.
In an alternative embodiment, the optical module has a field of view angle of 80 ° ≦ FOV ≦ 120 °, and the optical module satisfies: f is more than 14mm and less than 38.5mm, and the size range of the display screen 1 is as follows: d1 is more than or equal to 20mm and less than or equal to 60mm. In this embodiment, the angle of view of the optical module and the size range of the display screen 1 are limited in this embodiment, so that the VR device can be adapted to the small-size display screen 1, the medium-size display screen 1, and the large-size display screen 1 when the angle of view is increased.
In this embodiment, in practical use, the field angle FOV of the optical module may be defined as a preset angle, for example, the field angle FOV =100 ° of the optical module. By balancing the relation between the effective aperture of the polarizer and the size D1 of the display screen 1, for example, the effective aperture of the polarizer is larger, the size of the corresponding size D1 of the display screen 1 is larger, the effective aperture of the polarizer is smaller, and the size of the corresponding size D1 of the display screen 1 is smaller, so that (B1/2-D1/2)/L1 satisfies the range of-0.2-0.8, and the difference between the brightness of the light in the edge field and the brightness of the light in the central field is reduced.
In this embodiment, the effective focal length of the optical module is limited, so that the size D1 of the different display screens 1 is matched with different viewing angle FOVs, for example, the size of the display screen 1 is smaller, a smaller viewing angle can be matched, or the size of the display screen 1 is larger, a larger viewing angle can be matched, or a larger viewing angle can be matched, a small-size screen, a medium-size screen or a large-size screen can be matched, thereby improving the experience effect of the user.
According to a second aspect of embodiments of the present application, there is provided a head-mounted display device. The head mounted display device includes: a housing; and an optical module as described above.
The head-mounted display device is, for example, a VR head-mounted device, including VR glasses or a VR helmet, and the like, and this is not particularly limited in this application.
The specific implementation of the head-mounted display device according to the embodiment of the present application may refer to the embodiments of the display module, which are not described herein again.
The optical module provided in the embodiments of the present application is specifically described below by three embodiments.
Example 1
Referring to fig. 1, an optical module provided in an embodiment of the present application includes a display screen 1, a first lens 21, and a diaphragm 4, where the first lens 21 has a second surface facing the display screen 1 and a first surface facing away from the display screen 1, a light splitting element 5 is disposed on the second surface, and a polarizing element 3 and a first phase retarder 6 are disposed on the first surface. Wherein the first phase retarder 6 is arranged closer to the first lens 21 with respect to the polarizing element 3.
Wherein the effective aperture B1 of the polarizer 3 is 48.57mm (because the polarizer 3 is disposed on the surface of the first lens 21, the effective aperture of the first lens 21 is also 48.57mm here), the size D1 of the display screen 1 is 60mm, and the distance L1 from the polarizer 3 to the display screen 1 is 34.784mm. Wherein the effective focal length F of the optical module is 37mm and the field magnification β =7.76 of the optical module.
The optical parameters of the display screen 1, the first lens 21 and the diaphragm 4 can be referred to table 1:
the embodiment adapts 100 degree FOV and 60mm (large-size screen) image surface size, and the incidence angle of the light in the marginal field of view is 13 degree. In this embodiment (B1/2-D1/2)/L1 = -0.164, at this time, the display brightness of the light in the edge field is controlled to be reduced within 20% compared with the brightness in the angle (central field) of 0 °, that is, the brightness of the light in the edge field is reduced, and the uniformity of the brightness of the display screen 1 is improved.
It should be noted that the optical module can be adapted to a small-size screen, a medium-size screen, and a large-size screen by adjusting the parameter relationship among B1, D1, and L1.
Example 2
Referring to fig. 2, an optical module provided in an embodiment of the present application includes a display screen 1, a first lens 21, a second lens 22, and a diaphragm 4, where the first lens 21 is disposed farther from the display screen 1 than the second lens 22, the first lens 21 has a first surface facing away from the display screen 1 and a second surface disposed adjacent to the second lens 22, and the second lens 22 has a first surface disposed adjacent to the first lens 21 and a second surface disposed toward the display screen 1. The polarizing element 3 and the first phase retarder 6 are disposed on the second surface of the first lens 21, for example. Wherein the first phase retarder 6 is arranged further away from the first lens 21 with respect to the polarizing element 3. The light splitting element 5 is disposed on the second surface of the second lens 22.
Wherein the effective aperture B1 of the polarizer 3 is 54.4mm (because the polarizer 3 is disposed on the surface of the first lens 21, the effective aperture of the first lens 21 is 54.4mm, the size D1 of the display screen 1 is 56mm (large-size screen), and the distance L1 from the polarizer 3 to the display screen 1 is 32.83mm. Wherein the effective focal length F of the optical module is 35.79mm, and the field magnification beta of the optical module is =7.98.
The optical parameters of the display screen 1, the first lens 21, the second lens 22 and the diaphragm 4 can be referred to table 2:
the embodiment is suitable for 100-degree FOV and 56mm (large-size screen) image surface size, and the incidence angle of light rays in the marginal field of view is 3.6 degrees. In this embodiment (B1/2-D1/2)/L1 = -0.02, at this time, the display brightness of the light in the edge field is controlled to be reduced by less than 15% compared with the brightness in the angle of 0 ° (central field), that is, the brightness of the light in the edge field is reduced, and the uniformity of the brightness of the display screen 1 is improved.
Example 3
Referring to fig. 3, an optical module provided in an embodiment of the present application includes a display screen 1, a first lens 21, a second lens 22, and a diaphragm 4, where the first lens 21 is disposed farther from the display screen 1 than the second lens 22, the first lens 21 has a first surface facing away from the display screen 1 and a second surface disposed adjacent to the second lens 22, and the second lens 22 has a first surface disposed adjacent to the first lens 21 and a second surface disposed toward the display screen 1. The polarizing element 3 and the first phase retarder 6 are disposed on the second surface of the first lens 21, for example. Wherein the first phase retarder 6 is arranged further away from the first lens 21 with respect to the polarizing element 3. The light splitting element 5 is disposed on the second surface of the second lens 22.
Wherein the effective aperture B1 of the polarizer 3 is 31mm (since the polarizer 3 is disposed on the surface of the first lens 21, the effective aperture of the first lens 21 is also referred to herein as 31 mm), the size D1 of the display screen 1 is 20.7mm (small-sized screen), and the distance L1 from the polarizer 3 to the display screen 1 is 10.2mm. Wherein the effective focal length F of the optical module is 14.4mm and the field magnification β =18.36 of the optical module.
Wherein the optical parameters of the display screen 1, the first lens 21, the second lens 22 and the diaphragm 4 can be referred to table 3:
the present embodiment accommodates a 90 FOV and 20.7mm (small screen) image plane size with a marginal field of view at-21.7 ° of ray incidence. In this embodiment (B1/2-D1/2)/L1 =0.5, at this time, the display brightness of the light in the edge field is controlled to be reduced by less than 30% compared with the brightness in the angle of 0 ° (central field), that is, the brightness of the light in the edge field is reduced, and the uniformity of the brightness of the display screen 1 is improved.
According to another aspect of the embodiments of the present application, there is also provided a head-mounted display device, which includes a housing and the optical module as described above.
In the above embodiments, the differences between the embodiments are described with emphasis, and different optimization features between the embodiments may be combined to form a better embodiment as long as the differences are not contradictory, and in consideration of the brevity of the text, no further description is given here.
Although some specific embodiments of the present invention 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 illustration only and are not intended to limit the scope of the invention. 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 invention. The scope of the invention is defined by the appended claims.
Claims (13)
1. An optical module, comprising:
a display screen (1), the size of the display screen (1) being D1;
the lens group (2) is positioned on one side of a light emergent surface of the display screen (1), and the lens group (2) comprises at least one lens;
the optical module further comprises a polarizing element (3), a light splitting element (5) and a phase retarder, wherein the effective caliber of the polarizing element (3) is B1; the polarization element (3), the light splitting element (5) and the phase retarder are arranged on either side of a lens in the lens group (2);
the distance from the polarization element (3) to the display screen (1) is L1;
wherein the optical module satisfies: -0.2 < (B1/2-D1/2)/L1 < 0.8.
2. The optical module of claim 1, wherein the optical module is adapted to: -0.05 < (B1/2-D1/2)/L1 < 0.8.
3. The optical module of claim 1, wherein the optical module is adapted to: 7.5 < beta < 19, wherein beta is the field magnification.
4. Optical module according to claim 1, characterized in that the lens group (2) comprises a lens arranged adjacent to the display screen (1), said lens having a surface facing the display screen (1), the light-splitting element (5) being located at one side of said surface.
5. An optical module according to claim 1, characterized in that the polarizing element (3) is arranged on the side of the lens group (2) facing away from the display screen (1); or
The lens group (2) comprises at least two lenses including a first lens (21) closest to the human eye side, wherein the first lens (21) has a surface arranged away from the human eye, the polarizing element (3) being located at one side of the surface.
6. An optical module according to claim 1 or 5, characterized in that the phase retarder comprises a first phase retarder (6), which first phase retarder (6) is arranged at a side of the lens group (2) facing away from the display screen (1), and the first phase retarder (6) is arranged closer to the display screen (1) than the polarizing element (3); or
The lens group (2) comprises at least two lenses including a first lens (21) closest to the human eye side, wherein the first lens (21) has a surface arranged away from the human eye, the first phase retarder (6) is located at one side of the surface, and the first phase retarder (6) is arranged further away from the first lens (21) with respect to the polarizing element (3).
7. Optical module according to claim 1 or 4, characterized in that the phase retarder further comprises a second phase retarder, the lens group (2) comprising a lens arranged adjacent to the display screen (1), the lens having a surface facing the display screen (1), the second phase retarder being located at one side of the surface, the second phase retarder being arranged closer to the display screen (1) with respect to the light-splitting element (5).
8. An optical module according to claim 1, characterised in that the lens group (2) comprises a lens arranged adjacent to the display screen (1), the optical power of the lens being positive.
9. Optical module according to claim 1, characterized in that the distance of the polarizing element (3) from the display screen (1) is such that: l1 is more than 10mm and less than 35mm.
10. An optical module according to claim 1, characterised in that the effective aperture of the polarising element (3) is such as to satisfy: b1 is more than 30mm and less than 55mm.
11. The optical module of claim 1 wherein the optical module has a field of view angle of 80 ° ≦ FOV ≦ 120 °.
12. The optical module of claim 1 or 11, wherein the effective focal length range of the optical module is: f is more than 14mm and less than 38.5mm.
13. A head-mounted display device, comprising:
a housing; and
the optical module of any one of claims 1-12.
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| CN202221957737.9U CN218446224U (en) | 2022-07-26 | 2022-07-26 | Optical module and head-mounted display equipment |
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| CN202221957737.9U CN218446224U (en) | 2022-07-26 | 2022-07-26 | Optical module and head-mounted display equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024022091A1 (en) * | 2022-07-26 | 2024-02-01 | 歌尔光学科技有限公司 | Optical module and head-mounted display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024022091A1 (en) * | 2022-07-26 | 2024-02-01 | 歌尔光学科技有限公司 | Optical module and head-mounted display device |
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