CN217587772U

CN217587772U - Optical module and head-mounted display device

Info

Publication number: CN217587772U
Application number: CN202221941930.3U
Authority: CN
Inventors: 姜龙; 吴玉登; 赵博刚
Original assignee: Goertek Optical Technology Co Ltd
Current assignee: Goertek Optical Technology Co Ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2022-10-14
Anticipated expiration: 2032-07-26

Abstract

The utility model provides an optical module and head-mounted display device. The optical module includes: a display screen having a size D1; the lens group is positioned on one side of the light emergent surface of the display screen and comprises at least one lens; the optical module further comprises a polarizing element, a light splitting element and a phase retarder, wherein the polarizing element, the light splitting element and the phase retarder are arranged on any side of a lens in the lens group; wherein the eye movement range of human eyes is EB; wherein the optical module satisfies: EB/(D1/2) < 0.5 < 0.7.

Description

Optical module and head-mounted display device

Technical Field

The utility model relates to a nearly eye shows the imaging technology field, more specifically, the utility model relates to an optical module and wear 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.

The imaging definition of the head-mounted device is a key index for evaluating user experience, the volume and the weight of the head-mounted device are key indexes for evaluating the attractiveness and the wearing comfort of the head-mounted device, and therefore, the problem to be solved urgently is to improve the imaging definition of the head-mounted device under the condition of reducing the volume of the head-mounted device.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an optical module and wear display device's new technical scheme.

In a first aspect, the present invention provides an optical module, which includes:

a display screen having a size D1;

the lens group is positioned on one side of the light emergent surface of the display screen and comprises at least one lens;

the optical module further comprises a polarizing element, a light splitting element and a phase retarder, wherein the polarizing element, the light splitting element and the phase retarder are arranged on any side of a lens in the lens group;

wherein the eye movement range of human eyes is EB;

wherein the optical module satisfies: EB/(D1/2) < 0.5 < 0.7.

Optionally, the optical module satisfies: the incident angles of the marginal field rays are: -38 to-10 degrees.

Optionally, the effective aperture of the polarizing element is B1, and 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 distance from the polarizing element to the display screen satisfies: l1 is more than 11mm and less than 25mm.

Optionally, the effective aperture of the polarizing element satisfies: b1 is more than 40mm and less than 55mm.

Optionally, the light splitting element is disposed between the display screen and the lens group.

Optionally, the polarizing element is disposed on a side of the lens group facing away from the display screen; or

The lens group comprises at least two lenses, and the polarizing element is arranged between every two adjacent lenses.

Optionally, the phase retarder comprises a first phase retarder disposed 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 is disposed between adjacent two lenses.

Optionally, the phase retarder further comprises a second phase retarder located between the lens group and the display screen.

Optionally, the lens group comprises a lens disposed adjacent to the display screen, the power of the lens being positive.

Optionally, the field angle range of the optical module is 80 ° ≦ FOV ≦ 120 °.

Optionally, the eye movement range EB is 8mm to 12mm.

In a second aspect, a head mounted display device is provided. The head mounted display device includes:

a housing; and

an optical module as claimed in the first aspect.

According to the utility model discloses a technological effect lies in, through the eye movement scope of control people's eye, with the ratio of display screen's size (the size of the display screen of half), can realize in the space region that the eye movement scope was injectd, the user is using this optical module to carry out the vision and watches when experiencing, and the picture that the user watched is clear, has promoted the definition of formation of image picture.

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 schematic structural diagram of an optical module according to the present invention.

Fig. 2 is a schematic structural diagram of an optical module according to the present invention.

Fig. 3 is a schematic structural diagram of a third optical module according to the present invention.

Fig. 4 is a schematic structural diagram of a fourth optical module according to the present invention.

Description of reference numerals:

1. a display screen; 2. a lens group; 21. a first lens; 22. a second lens; 23. a third 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 invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

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

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

In all examples shown and discussed herein, any particular value should be construed as 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, it need not be discussed further in subsequent figures.

In the prior art, in the simulation optimization process, limited human eyes are fixed in a preset area, and the human eyes and the optical axis of an optical module are coaxially arranged, so that the relation between the eye movement range of a user and the quality of an imaging picture is not considered. In the actual wearing process, because the head-mounted equipment can be worn by different users, the human eyes of different users can be in different positions, so that the quality of the imaging images visually observed by different users is different; or for some wearing reasons, the eyes of the user are not arranged coaxially with the optical module, and the quality of the imaging image observed visually is different from the imaging quality optimized by simulation.

Based on the technical problem, the embodiment of the utility model provides a first aspect provides an optical module, optical module is a folding light path optical structure design, and it can contain at least one optical lens, can be fit for being applied to in wear display device (head mounted display, HMD) for example, VR head mounted device, if can include products such as VR glasses or VR helmet, the embodiment of the utility model provides an it is not specifically restricted to this.

The optical module and the head-mounted display device provided by the embodiment of the invention are described in detail with reference to fig. 1 to 4.

An embodiment of the utility model provides an optical module, as shown in fig. 1 to fig. 4, optical module includes: and displaying a screen 1, wherein the size of the display screen 1 is D1. And the lens group 2 is positioned on one side of the 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 polarizing element 3, the light splitting element 5 and the phase retarder are arranged on any side of a lens in the lens group 2.

Wherein the eye movement range of human eyes is EB;

wherein the optical module satisfies: EB/(D1/2) < 0.5 < 0.7.

In other words, the optical module mainly includes the display screen 1, the lens assembly 2, the polarizer 3, the beam splitter 5 and the phase retarder.

The Display screen 1 may be an LCD (Liquid Crystal Display) LCD, or an LED (Light Emitting Diode), an OLED (Organic Light-Emitting Diode), a Micro-OLED (Micro-Organic Light-Emitting Diode), an ULED (Ultra Light Emitting Diode), or a DMD (Digital Micro mirror Device) Digital micromirror chip.

Wherein in this embodiment, the size of the display screen 1 is D1, wherein the size of the display screen 1 is defined as: the maximum size for displaying an image picture, for example, the display screen 1 has an area for displaying a picture, the maximum size of which is the size of the display screen 1.

Wherein the lens group 2 is arranged in the light emergent direction of the display screen 1; the lens group 2 plays a role in magnifying resolving light. For example, in a display device such as VR (Virtual Reality), in order to ensure that a user obtains an enlarged display, light needs to be enlarged, and the user obtains an identifiable enlarged image through the lens group 2. The lens group 2 may include one lens or a plurality of lenses, and the embodiment of the present invention does not limit the number of lenses in the lens group 2. However, in the folded optical path, the number of lenses in the optical architecture of the folded optical path may be at most three with respect to the direct-illumination optical architecture, in view of the fact that the light has been folded.

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 spectroscopic element 5, and a phase retarder are provided on either side of the lens group 2.

Specifically, in order to realize the folded optical path arrangement, a polarizing element 3, a light splitting element 5, and a phase retarder are disposed on either side of 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 polarizing element 3 is operable to transmit the P-polarized light and reflect 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.

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. For example, the phase retarder may be 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.

The present embodiment limits the eye movement range of human eyes, that is, limits the numerical value of the eye movement range in the simulation optimization process. The eye movement range is a spatial region where the eyes of an observer (user) assumed to be a virtual image are located, that is, the spatial region where the eyes of the user can be located during actual wearing. The eyes of the user are in the space area, and the user can see the imaging picture clearly.

For example, the eye movement range includes a horizontal movement range and a vertical movement range. Taking the center of the human eye as an origin, in the horizontal direction, the range (considering the radius of the human eye) in which the human eye can move from the left side to the right side (or from the right side to the left side) is an eye movement horizontal movement range; and a range in which the human eye can move from the upper side to the lower side (or from the lower side to the upper side) in the vertical direction (in consideration of the radius of the human eye) with the center of the human eye as the origin is an eye movement vertical movement range. In this embodiment, the eye movement range specifically refers to the eye movement horizontal movement range.

According to the utility model discloses an embodiment, through eye movement scope EB among the control optical module, with the ratio relation of half display screen 1's size (also be through injecing twice eye movement scope EB promptly, with the ratio relation of display screen 1's size), can realize in the space region that eye movement scope is injecive, the user is when using this optical module to carry out the vision and watch experience, in this space region, the picture that the user watched is clear complete, can avoid because of the change of people's eye position, make the picture definition circumstances of decline appear when watching, thereby can promote optical module's imaging quality. Wherein the human eyes are positioned in the same positions as the diaphragms 4 shown in figures 1-4.

That is to say, the embodiment of the present invention provides an optical module, which does not cause the decrease of the definition of the image viewed when the optical module is used due to the change of the relative position between the human eye and the optical module. The utility model discloses optical module can effectively promote the image quality to make the different users homoenergetic obtain the visual experience of preferred when carrying out virtual experience.

Specifically, considering that there is a corresponding relationship between the eye movement range EB and the size of the display screen 1, that is, in practical application, there is a positive correlation corresponding relationship between the eye movement range EB and the size of the display screen 1, and the larger the size screen of the display screen 1 is, the larger the eye movement range EB is, the smaller the size of the display screen 1 is, and the smaller the eye movement range EB is; based on the relationship between the eye movement range EB and the size of the display screen 1, the present embodiment actively defines the relationship between the eye movement range EB and the size of the display screen 1 (specifically, the size of one-half of the display screen 1), i.e. defines 0.5 < EB/(D1/2) < 0.7, i.e. defines 0.5 < 2EB/D1 < 0.7, and specifically, in the eye movement range, the picture viewed by the user is clear and complete, so that the user has a better experience effect.

It should be noted that, in the embodiment of the present invention, a person skilled in the art can flexibly adjust the eye movement range EB to the ratio range of one-half of the size of the display screen 1 according to specific needs.

For example, the ratio of the double eye movement range EB to the size of the display screen 1 may be 0.55 to 0.65.

For another example, the ratio of the two times of the eye movement range EB to the size of the display screen 1 may be 0.6 to 0.65.

Within the range of each ratio, when human eyes perform virtual experience in different eye movement ranges (space areas where the eyes are located), clear and complete pictures can be presented in the human eyes, and the visual impression of a user can be effectively improved.

Of course, in the embodiment of the present invention, the relation between the eye movement range EB set in the optical module and the ratio of the size of the half display screen 1 (i.e. the ratio of the double eye movement range EB to the size of the display screen 1) is not limited to the above three examples, and those skilled in the art can flexibly adjust the eye movement range EB as required, and the embodiment of the present invention does not specifically limit this.

In one embodiment, the optical module satisfies: the incident angles of the marginal field rays are: -38 to-10 degrees.

In this embodiment, the display screen 1 includes pixels arranged in rows and columns, each pixel is a light emitting unit, and the light emitted from the light emitting unit forms a conical diffused light. The incident light rays emitted by the display screen 1 include a chief ray and an edge relationship, wherein the edge rays are peripheral to the chief ray. Where the chief rays correspond to the central field of view and the marginal rays correspond to the marginal field of view.

In this embodiment, the incident angle of the edge field (i.e. the exit angle of the light emitted from the display screen 1 because the light is reversible) is limited, so that the light of the edge field and the light of the center field can enter the human eye and image within the eye movement range, and the user can observe a clear and complete imaging picture through visual observation.

In one embodiment, the effective aperture of the polarizer 3 is B1, and the distance from the polarizer 3 to the display screen 1 is L1;

wherein the optical module satisfies: 0.2 < (B1/2-D1/2)/L1 < 0.8.

In this embodiment, the effective aperture of the polarizing element 3 is B1. In this embodiment, the distance from the polarizing element 3 to the display screen 1 is defined as L1, no matter where the polarizing element 3 is disposed. The effective aperture B1 of the polarization element 3 may be larger than the size D1 of the display screen 1, or smaller than the size D1 of the display screen 1, or equal to the size D1 of the display screen 1. The user experience effect can be improved only by mutual collocation.

In this embodiment, the (B1/2-D1/2)/L1 is defined within this range, and 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 a user observes images at different viewing angles, the brightness difference of the images at different viewing angles is smaller, that is, when the user observes an image in the central region and an image in the edge region, the difference in brightness perceived by the user is smaller, the eyes of the user are not easily tired when the user observes the screen, and the user experience is improved.

Specifically, the polarizing element 3 is used as 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 of the display screen 1 reflected by the polarizing element 3 can basically correspond to the light direction of the edge field of view in the optical module, specifically, the tangent value of the angle of the edge light is approximate to the difference between the effective aperture B1 provided with 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 light emitted from the image on the display screen 1 (because the incident angle cannot be accurately controlled), the relationship among the effective aperture B1 of the polarizer 3, the distance L1 from the polarizer 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 caliber provided with 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 percent, and the sensitivity of human eyes for observing the brightness of the image is met.

In this embodiment, therefore, the optical module satisfies: 0.5 < EB/(D1/2) < 0.7, and satisfies: -0.2 < (B1/2-D1/2)/L1 < 0.8 in the eye movement range so that the sharpness and brightness of the imaged image visually observed by the user are homogenized.

In addition, the sensitivity of the human eye to the sharpness of the imaged image is stronger than the sensitivity of the human eye to the brightness of the imaged image, so that when the ratio EB/(D1/2) is controlled within this range, the sharpness of the peripheral field and the sharpness of the central field observed by the user are uniform and uniform within the eye movement range. Therefore, when the ratio of (B1/2-D1/2)/L1 is controlled within this range, the decrease range of the brightness of the peripheral field with respect to the brightness of the central field is controlled within 30% in the eye movement range, and the brightness of the peripheral field and the brightness of the central field observed by the user are uniform as long as the decrease range of the brightness of the peripheral field with respect to the brightness of the central field is controlled within 30%.

In an optional embodiment, the optical module of this embodiment satisfies: 0.2 < (B1/2-D1/2)/L1 < 0.8, so that the incidence angle of the marginal field of view of the optical module is-38 degrees to-10 degrees. That is, the embodiment defines the ratio (B1/2-D1/2)/L1 within this range, and the simulated incidence angle range of the edge field is within-38 to-10 degrees. That is, the embodiment defines the ratio of (B1/2-D1/2)/L1 in this range, optimizes the incident angle of the imaged image, and defines that the brightness of the edge area of the display screen 1 is reduced within 30%, and the brightness of the edge area of the imaged picture imaged in the human eye is reduced within 30%.

In one embodiment, the distance from the polarizing element 3 to the display screen 1 satisfies: l1 is more than 11mm and less than 25mm.

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 polarizing element 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 one embodiment, the effective aperture of the polarizing element 3 is such that: b1 is more than 40mm and less than 55mm.

In this embodiment, the effective aperture supporting the polarizing element 3 is defined such that, on the one hand, the range of (B1/2-D1/2)/L1 is in the range of-0.2 < (B1/2-D1/2)/L1 < 0.8, the difference between the brightness of the light rays in the edge field and the brightness of the light rays in the center field is reduced; on the other hand, after the optical processing is performed by the polarization element 3, the processed light can better simulate the light of the marginal field of view of the optical module, so that the (B1/2-D1/2)/L1 can better reflect the transmission characteristic of the light of the marginal field of view.

In one embodiment, as illustrated with reference to fig. 1-4, 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 1, 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 bearing member that bears 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 bearing member.

It should be noted that those skilled in the art can reasonably adjust the arrangement position of the light splitting element 5 as needed.

In one embodiment, referring to fig. 1-4, the polarizing element 3 is arranged on a side of the lens assembly 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 the lenses 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 carrier member is provided between the first lens 21 and the human eye, and a polarizing element is provided on the carrier member.

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.

Referring to fig. 4, the lens group 2 includes three lenses. The three lenses include a first lens 21, a second lens 22, and a third lens 23. Wherein the first lens 21 is arranged further away from the display screen 1 with respect to the third lens 23. The second lens 22 is located between the first lens 21 and the third lens 23. Wherein in the first lens 21, the polarizing element 3 is disposed on a surface adjacent to the second lens 22. Or the polarizing element 3 is arranged between the first lens 21 and the second lens 22. The polarizing element 3 is not provided on the surface of any lens, but a carrier member on which the polarizing element 3 is provided between the first lens 21 and the second lens 22.

It should be noted that a person skilled in the art can reasonably adjust the arrangement position of the polarizing element 3 as needed.

In one embodiment, the phase retarder comprises a first phase retarder 6, the first phase retarder 6 being arranged between the polarizing element 3 and a lens of the lens group 2, or

The lens group includes at least two lenses, and the first phase retarder 6 is disposed between adjacent two lenses.

In this embodiment, as shown with reference to fig. 1, 2 and 3, the first phase retarder 6 is disposed in the lens group on the side away from the display screen 1, the polarizing element 3 is disposed in the lens group 2 on the side away from the display screen 1, that is, the first phase retarder 6 and the polarizing element 3 are disposed in the lens group 2 toward the human eye side, and the first phase retarder 6 is located between the polarizing element 3 and the lens group 2. 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. 4, the lens group 2 includes three lenses including a first lens 21, a second lens 22, and a third lens 23, wherein the first lens 21 is disposed farther from the display screen 1 than the third lens 23, and the second lens 22 is disposed between the first lens 21 and the third lens 23. 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 the surface adjacent to the first lens 21; or as shown in fig. 4, the first phase retarder 6 is disposed 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 an embodiment the phase retarder further comprises a second phase retarder located between said lens group 2 and said display screen 1.

In this embodiment, the setting position of the second phase retarder is defined, wherein the second phase retarder is located on the light exit surface side of the display screen 1, for example, between the lens group 2 and the display screen 1.

In an embodiment the lens group 2 comprises a lens arranged adjacent to said display screen 1, the optical power of said lens being positive.

In this embodiment, the lens group 2 includes a lens disposed adjacent to the display screen 1, where the focal 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. 1-4, 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 field of view angle of the optical module is 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.

Specifically, the field angle FOV of the optical module is defined, and the optical module is applied to a head-mounted device, and the head-mounted device has a larger field angle. The head-mounted device provided by the embodiment thus increases the angle of field, can be adapted to display screens 1 of different sizes (particularly to small-sized display screens 1), and does not reduce the sharpness of the imaged image in the range of eye movement.

In one embodiment, the eye movement range EB is 8mm-12mm.

In this embodiment, the eye movement range EB is limited within this range, and the optical module can be made thin and compact, and has a feature of a larger eye movement range.

In an alternative embodiment the size of the display screen 1 is 25mm-50mm.

In this embodiment, the size of the display screen 1 is limited to the range, that is, the optical module can be matched with the small-size display screen 1, the medium-size display screen 1 and the large-size display screen 1.

In this embodiment, the eye movement range EB and the size of the display screen 1 are limited, the eye movement range can be controlled, and the ratio of the eye movement range EB to the size of one half of the display screen 1 meets the requirement of the ratio range of 0.5 < EB/(D1/2) < 0.7, so that the eyes can move within the eye movement range, and the user does not have the situation of the definition reduction when using the optical module.

In a second aspect, the present invention provides a head-mounted display device. The head mounted display device includes:

a housing; and

an optical module as claimed in the first aspect.

Wear display device for example for VR head-mounted apparatus, including VR glasses or VR helmet etc. the embodiment of the utility model provides a do not do specific restriction to this.

The utility model discloses wear display device's concrete implementation can refer to above-mentioned each embodiment of display module assembly, no longer gives unnecessary details here.

The optical module provided by the embodiment of the present invention is specifically described through four embodiments below.

Example 1

Referring to fig. 1, an embodiment of the present invention provides an optical module, which includes a display screen 1, a first lens 21, and a diaphragm 4, wherein 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 polarization 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 (i.e., the first phase retarder 6 is arranged closer to the display screen 1 side with respect to the polarizing element 3). Wherein the diaphragm 4 is arranged at the position of the human eye.

Wherein the effective aperture B1 of the first lens 21 is 42.36mm, the size D1 of the display screen 1 is 25mm (small screen), and the distance L1 from the polarizing element 3 to the display screen 1 is 12.8587mm; the eye movement range EB of the human eye is 8mm.

The optical parameters of the display screen 1, the first lens 21 and the diaphragm 4 can be shown in table 1:

the present embodiment is adapted to a 100 FOV and 25mm (small screen) image plane size with a marginal field of view at-30.51 ° of ray incidence. In this embodiment EB/(D1/2) =0.64, when human eyes are controlled within the eye movement range, a clear image can be visually observed.

The present embodiment is adapted to a 100 FOV and 25mm (small screen) image plane size with a marginal field of view at-30.51 ° of ray incidence. In this embodiment (B1/2-D1/2)/L1 =0.675, the brightness of the light in the edge field is controlled to decrease by 25% -30% as compared with the brightness of the light in the edge field at an angle of 0 ° (central field), that is, the brightness of the light in the edge field is decreased, and the uniformity of the brightness of the display screen 1 is improved.

Example 2

Referring to fig. 2, an embodiment of the present invention provides an optical module, which includes a display screen 1, a first lens 21, a second lens 22, and a diaphragm 4, wherein 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 second lens 22, and a second surface disposed adjacent to the second lens 22; 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 first surface of the first lens 21, for example. Wherein the first phase retarder 6 is disposed closer to the first lens 21 with respect to the polarizing element 3, and the light splitting element 5 is disposed on the second surface of the second lens 22.

Wherein the effective aperture B1 of the polarizing element 3 is 53.2mm (since the polarizing element 3 is disposed on the surface of the first lens 21, the effective aperture of the first lens 21 is also 53.2mm here), the size D1 of the display screen 1 is 46mm (middle size screen), the distance L1 from the polarizing element 3 to the display screen 1 is 23.64mm, and the eye movement range of human eyes is 12mm.

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:

this embodiment is adapted to a 100 FOV and 46mm (medium screen) image plane size with a marginal field of view at-7.1 ° ray incidence. In this embodiment EB/(D1/2) =0.52, in this case, a clear image can be visually observed by controlling human eyes within the eye movement range.

The present embodiment accommodates a 100 FOV and 46mm (medium screen) image plane size with a marginal field of view at-7.1 ° ray incidence. In this embodiment (B1/2-D1/2)/L1 =0.15, at this time, the display brightness of the light in the edge field is controlled to be decreased 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 decreased, and the uniformity of the brightness of the display screen 1 is improved.

Example 3

Referring to fig. 3, an embodiment of the present invention provides an optical module, including a display screen 1, a first lens 21, a second lens 22 and a diaphragm 4, wherein the first lens 21 is disposed farther away 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 first surface of the first lens 21, for example. Wherein the first phase retarder 6 is disposed closer to the first lens 21 with respect to the polarizing element 3, and the light splitting element 5 is disposed on the second surface of the second lens 22.

Wherein the eye movement range is EB of 12mm (the eye movement horizontal range and the eye movement vertical range may be equal or not), the effective aperture B1 of the polarization element 3 is 47.6mm (because the polarization element 3 is disposed on the surface of the first lens 21, the effective aperture of the first lens 21 is 47.6mm, the size D1 of the display screen 1 is 38mm, and the distance L1 from the polarization element 3 to the display module is 20.89mm.

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:

this embodiment is adapted to 100 FOV and 38mm (medium screen) image plane size with a marginal field of view at-10 ° ray incidence. In this embodiment EB/(D1/2) =0.63, when human eyes are controlled within the eye movement range, a clear image can be visually observed.

This embodiment is adapted to 100 FOV and 38mm (medium screen) image plane size with a marginal field of view at-10 ° ray incidence. In this embodiment (B1/2-D1/2)/L1 =0.23, at this time, the brightness of the light in the edge field is controlled to decrease by less than 20% when compared with the brightness in the angle of 0 ° (central field), that is, the brightness of the light in the edge field is decreased, and the uniformity of the brightness of the display screen 1 is improved.

Example 4

Referring to fig. 4, an embodiment of the present invention provides an optical module, including a display screen 1, a first lens 21, a second lens 22, and a third lens 23, wherein the first lens 21 is farther away from the display screen 1 than the third lens 23, the third lens 23 is adjacent to the display screen 1, and the second lens 22 is located between the first lens 21 and the third lens 23.

The first lens 21 has a first surface facing away from the second lens 22, and a second surface disposed adjacent to the second lens 22; the second lens 22 has a first surface disposed adjacent to the first lens 21, and a second surface disposed adjacent to the third lens 23; the third lens 23 has a first surface disposed adjacent to the second lens 22, and a second surface disposed toward the display screen 1.

For example, the polarizing element 3 and the first phase retarder 6 are disposed on the second surface of the first lens 21, wherein the first phase retarder 6 is disposed closer to the second lens 21 with respect to the polarizing element 3 (i.e., the first phase retarder 6 is disposed closer to the display screen 1 side with respect to the polarizing element 3), and the light splitting element 5 is disposed on the second surface of the third lens 23.

Wherein the effective aperture B1 of the polarizing element 3 is 40.26mm (since the polarizing element 3 is disposed on the surface of the first lens 21, it is also referred to herein as 40.26mm for the effective aperture of the first lens 21), the size D1 of the display screen 1 is 26mm (small-sized screen), the distance L1 from the polarizing element 3 to the display screen 1 is 11.1583mm, wherein the eye-movement range of human eyes is 8mm.

The optical parameters of the display screen 1, the first lens 21, the second lens 22, the third lens 23 and the diaphragm 4 can be shown with reference to table 4:

the present embodiment is adapted to a 100 FOV and 26mm (large screen) image plane size, with a ray incidence angle of-37.1 for the marginal field of view. In this embodiment EB/(D1/2) =0.62, when human eyes are controlled within the range of eye movement, clear images can be observed visually.

The present embodiment is adapted to a 100 FOV and 26mm (large screen) image plane size, with a ray incidence angle of-37.1 for the marginal field of view. In this embodiment (B1/2-D1/2)/L1 =0.64, at this time, the brightness of the light in the edge field is controlled to decrease by less than 30% when the display brightness of the light in the edge field is smaller than the brightness in the angle of 0 ° (central field), that is, the brightness of the light in the edge field is decreased, and the uniformity of the brightness of the display screen 1 is improved.

According to the utility model discloses on the other hand, still provide a wear display device, wear display device includes the casing, and as above-mentioned optical module.

In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.

Although some specific embodiments of the present 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

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 emitting 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 polarizing element (3), the light splitting element (5) and the phase retarder are arranged on any side of a lens in the lens group (2);

wherein the eye movement range of human eyes is EB;

wherein the optical module satisfies: EB/(D1/2) < 0.5 < 0.7.

2. The optical module of claim 1, wherein the optical module is adapted to: the incident angles of the marginal field rays are: -38 to-10 degrees.

3. Optical module according to claim 1, in which the effective aperture of the polarizing element (3) is B1, the distance from the polarizing element (3) to the display screen (1) being L1;

wherein the optical module satisfies: -0.2 < (B1/2-D1/2)/L1 < 0.8.

4. An optical module according to claim 3, characterized in that the distance of the polarizing element (3) from the display screen (1) is such that: l1 is more than 11mm and less than 25mm.

5. An optical module according to claim 3, characterised in that the effective aperture of the polarising element (3) is such as to satisfy: b1 is more than 40mm and less than 55mm.

6. Optical module according to claim 1, characterized in that the light-splitting element (5) is arranged between the display screen (1) and the lens group (2).

7. 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, and the polarizing element (3) is arranged between two adjacent lenses.

8. An optical module according to claim 1, characterized in that the phase retarder comprises a first phase retarder (6), the first phase retarder (6) being arranged between the polarizing element (3) and a lens of the lens group (2), or

The lens group (2) includes at least two lenses, and the first phase retarder (6) is disposed between adjacent two lenses.

9. Optical module according to claim 1, characterized in that the phase retarder further comprises a second phase retarder located between the lens group (2) and the display screen (1).

10. 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.

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 wherein the eye movement range EB is 8mm to 12mm.

13. A head-mounted display device, comprising:

a housing; and

the optical module of any one of claims 1-12.