CN117311004A - Short-distance optical amplification module, head-mounted display and virtual reality system - Google Patents

Abstract

The invention relates to the technical field of optical imaging, in particular to a short-distance optical amplifying module, a head-mounted display and a virtual reality system. The lens group arranged in the light emitting direction of the display screen is provided with a wavelength selective reflecting surface and another visible light splitting surface. The wavelength selective reflecting surface is used for reflecting a detection light beam which emits a non-visible light wave band to human eyes to an optical receiving unit for realizing eye information acquisition, namely a conventional light emitting unit for generating the detection light beam is used as a light emitting device with an eye information acquisition function; the visible light beam splitting surface is used for reflecting the display light beam reflected by human eyes to the optical receiving unit for realizing the eye information acquisition function, namely, the display screen generating the display light beam is used as the light emitting device of the eye information acquisition function. The short-distance optical amplification module is provided with the light-emitting device with the eye information acquisition function, so that the light-emitting device is convenient to temporarily switch, the use time of a single light source is reduced, and the failure rate of the light-emitting device is reduced.

Description

Short-distance optical amplification module, head-mounted display and virtual reality system

Technical Field

The invention relates to the technical field of virtual reality equipment, in particular to a short-distance optical amplifying module, a head-mounted display and a virtual reality system.

Background

The Virtual Reality (VR) technology includes a computer, electronic information, and a simulation technology, and the basic implementation manner is that the computer simulates a Virtual environment so as to bring the sense of environmental immersion to people. Today, virtual reality technology is rapidly developed, and the application field of the technology tends to be wide. In order to better promote user experience, the function of VR product is also more diversified. At present, an eye information acquisition technology gradually becomes a major improvement breakthrough direction in VR products, and the eye information acquisition technology commonly comprises an eye movement tracking technology, an eyeball iris identification technology, an eye periocular image acquisition technology, a facial expression identification technology and the like.

In the mainstream eye information acquisition scheme at present, generally the light emitting source adopts the infrared light source, through penetrating the eye with the infrared light, in the light that the eye was reflected enters into the acquisition camera, realizes the collection to eye image information, realizes multiple different functions through image processing. However, the infrared light source is used as the light emitting device for eye information acquisition, which is too single, and the infrared light source is started for a long time, so that the light source is easily damaged, and the energy consumption is increased.

Disclosure of Invention

In order to solve the above problems, the application provides a short-distance optical amplifying module, a head-mounted display and a virtual reality system, which not only uses conventionally used light emitting units such as infrared light sources as light emitting devices for eye information acquisition, but also reflects display light beams reflected by human eyes to an optical receiving unit with an eye information acquisition function through an additionally arranged visible light splitting surface, so that a display screen generating the display light beams is used as another light emitting device with the eye information acquisition function, thereby being convenient for temporary switching, reducing the using time of a single light emitting device and reducing the failure rate of the light emitting device.

In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

in a first aspect, the present application provides a short-range optical amplifying module comprising:

the display device comprises a light emitting unit, a display screen, a second lens group, an optical receiving unit and a first lens group, wherein the second lens group, the optical receiving unit and the first lens group are sequentially arranged along the light emitting direction of the display screen;

the display light beam emitted by the display screen enters human eyes after passing through the second lens group and the first lens group;

the light emitting unit is used for emitting detection light beams in a non-visible light wave band to the human eyes and can correspondingly enter a dormant or starting state according to the bright-dark state of the display screen;

a wavelength selective reflecting surface and a visible light splitting surface are arranged between the optical receiving unit and the display screen; the wavelength selective reflecting surface is used for reflecting the detection light beam reflected by human eyes to the optical receiving unit so as to realize an eye information acquisition function; the visible light beam splitting surface is used for reflecting the display light beam reflected by the human eyes to the optical receiving unit according to the target optical characteristics so as to realize an eye information acquisition function.

It can be appreciated that the application discloses a short-distance optical amplifying module, wherein the lens group arranged in the light emitting direction of the display screen is provided with another visible light splitting surface besides the wavelength selective reflecting surface. The wavelength selective reflecting surface is used for reflecting a detection light beam which emits a non-visible light wave band to human eyes to the optical receiving unit for realizing the eye information acquisition function, namely a conventional light emitting unit for generating the detection light beam is used as a light emitting device for the eye information acquisition function; the visible light beam splitting surface is used for reflecting the display light beam reflected by human eyes to the optical receiving unit for realizing the eye information acquisition function, namely, the display screen generating the display light beam is used as the light emitting device of the eye information acquisition function. The short-distance optical amplification module is provided with the light-emitting device with the eye information acquisition function, so that the light-emitting device is convenient to temporarily switch, the use time of a single light source is reduced, and the failure rate of the light-emitting device is reduced.

It can be understood that the light emitting unit is controlled to be turned off when the display brightness of the display screen is greater than the brightness threshold value, and turned on when the display brightness of the display screen is less than the brightness threshold value. Thus, the light emitting unit can be prevented from being in a starting state for a long time, and the energy consumption is increased invalidity.

The light emitting device for realizing the eye information acquisition function can be a display screen for generating display light beams, or can be an added light emitting unit for emitting acquisition light beams to human eyes. The display screen is directly used as the light-emitting equipment with the eye information acquisition function, so that the whole space and the construction cost of the short-distance optical amplifying module can be saved; the light emitting unit is used as the light emitting device with the eye information acquisition function, the design and manufacturing difficulty requirements on the visible light splitting surface are lower, the brightness of the target light beam reflected into the optical receiving unit is higher, and the later calculation of eye image information is easier.

In an alternative embodiment of the present application, the wavelength selective reflective surface comprises at least one of:

a wavelength selective reflective film disposed on the first optical surface of the second lens group;

a first mirror provided between the first lens group and the second lens group, and a wavelength selective reflection film laminated on the first mirror;

the visible light splitting surface comprises at least one of the following:

a visible light splitting film provided on a second optical surface of the second lens group;

and a second mirror provided between the first lens group and the second lens group, and a visible light splitting film laminated on the second mirror.

It is understood that each of the first lens group and the second lens group may include at least one optical element such as a lens, and the first optical surface and the second optical surface may be any surface of any lens in the second lens group.

In an alternative embodiment of the present application, the short-range optical amplifying module includes at least one of the following:

case 1: the first mirror and the second mirror may be the same mirror or different mirrors; when the first reflecting mirror and the second reflecting mirror are the same reflecting mirror, the wavelength selective reflecting film and the visible light splitting film are stacked on the reflecting mirror; when the first reflecting mirror and the second reflecting mirror are different reflecting mirrors, the wavelength selective reflecting film and the visible light splitting film are respectively arranged on the surfaces of the corresponding reflecting mirrors.

Case 2: the first optical surface and the second optical surface may be the same optical surface or different optical surfaces; when the first optical surface and the second optical surface are the same optical surface, the wavelength selective reflection film and the visible light splitting film are stacked on the same surface of the same lens in the second lens group; when the first optical surface and the second optical surface are different optical surfaces, the wavelength selective reflection film and the visible light splitting film are arranged on different surfaces of the same lens in the second lens group, or the wavelength selective reflection film and the visible light splitting film are arranged on surfaces of different lenses in the second lens group.

It can be understood that the light-emitting angle of the display beam emitted by the display screen is generally different from that of the detection beam emitted by the light-emitting unit, so that the visible light splitting film and the wavelength selective reflecting film can be arranged on different optical surfaces, which is more convenient for the light path design and the position design of the light-emitting unit.

In an alternative embodiment of the present application, the visible light splitting plane is configured to reflect the display light beam reflected by the human eye to the optical receiving unit according to a target optical characteristic.

In an alternative embodiment of the present application, the target optical characteristics include at least one of: the polarization direction and the angle of the incident light; the visible light splitting surface comprises at least one of the following: a polarization-selective reflective film and an angle-selective reflective film.

In an alternative embodiment of the present application, the visible light splitting film is a polarization selective reflection film disposed on the second optical surface of the second lens group and used for reflecting the light beam with the first polarization direction, the polarization direction of the display light beam exiting from the display screen to reach the polarization selective reflection film is orthogonal to the first polarization direction, and a first quarter wave plate is further disposed on one side of the polarization selective reflection film close to the first lens group; the display light beam passes through the first quarter wave plate for the first time in the process of being incident into the human eye, and passes through the first quarter wave plate for the second time in the process of being reflected to the polarization selective reflection film by the human eye.

In an optional embodiment of the present application, the visible light splitting film is an angle selective reflection film disposed on the second optical surface of the second lens group and used for reflecting the light beam in the first incident angle range, the display light beam emitted from the display screen does not satisfy the first incident angle range, and the display light beam reflected by the human eye satisfies the first incident angle range.

In an alternative embodiment of the present application, the first incident angle range is a range in which the incident angle is greater than the first angle, and the first angle is less than or equal to 40 ° when the second optical surface is a reflective surface having negative optical power; when the second optical surface is a reflective surface having positive optical power, the first angle is less than or equal to 25 °; when the second optical surface is a plane, the first angle is less than or equal to 32 °.

In an alternative embodiment of the present application, the second lens group includes a folded light path component, where the folded light path component includes a second quarter wave plate, a partially transmissive partial reflector, a third quarter wave plate, and a reflective polarizer that are sequentially disposed along a light emitting direction of the display screen, and the wavelength selective reflective surface and the visible light splitting surface are disposed between the first lens group and the reflective polarizer.

In an alternative embodiment of the present application, when the first lens group is a first lens having positive optical power, the second lens group includes at least one of the following:

a second lens having positive optical power, the surface of the second lens facing away from the display screen being a plane;

a third lens and a second lens are sequentially arranged along the light emitting direction of the display screen, the second lens and the third lens both have positive focal power, and the surface of the second lens, which faces away from the display screen, is a convex surface;

a third lens and a second lens are sequentially arranged along the light emitting direction of the display screen, the third lens has positive focal power, the second lens has negative focal power, and the surface of the second lens, which faces away from the display screen, is a concave surface;

when the first lens group is a first lens with negative focal power, the second lens group comprises a third lens and a second lens which are sequentially arranged along the light emitting direction of the display screen, the second lens and the third lens both have positive focal power, and the surface of the second lens, deviating from the display screen, is a concave surface.

In a second aspect, there is provided a head mounted display comprising: a short-range optical amplifying module according to any of the first aspect.

In a third aspect, the present application provides a virtual reality system comprising a head mounted display according to any of the second aspects, and an external operating unit establishing a connection with the head mounted display.

The beneficial effects are that:

the application discloses a short-distance optical amplification module, in the lens group that sets up in the display screen light-emitting direction except being provided with wavelength selective reflection face, still be provided with another visible light beam splitting face. The wavelength selective reflecting surface is used for reflecting a detection light beam which emits a non-visible light wave band to human eyes to the optical receiving unit for realizing the eye information acquisition function, namely a conventional light emitting unit for generating the detection light beam is used as a light emitting device for the eye information acquisition function; the visible light beam splitting surface is used for reflecting the display light beam reflected by human eyes to the optical receiving unit for realizing the eye information acquisition function, namely, the display screen generating the display light beam is used as the light emitting device of the eye information acquisition function. The short-distance optical amplification module is provided with the light-emitting device with the eye information acquisition function, so that the light-emitting device is convenient to temporarily switch, the use time of a single light source is reduced, and the failure rate of the light-emitting device is reduced.

In addition, the short-distance optical amplifying module can be controlled to be closed when the display brightness of the display screen is larger than the brightness threshold value and opened when the display brightness of the display screen is smaller than the brightness threshold value in the using process. Thus, the light emitting unit can be prevented from being in a starting state for a long time, and the energy consumption is increased invalidity.

The display screen is directly used as the light-emitting equipment with the eye information acquisition function, so that the whole space and the construction cost of the short-distance optical amplifying module can be saved; the light emitting unit is used as the light emitting device with the eye information acquisition function, the design and manufacturing difficulty requirements on the visible light splitting surface are lower, the brightness of the target light beam reflected into the optical receiving unit is higher, and the later calculation of eye image information is easier.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

The methods, systems, and/or programs in the accompanying drawings will be described further in terms of exemplary embodiments. These exemplary embodiments will be described in detail with reference to the drawings. These exemplary embodiments are non-limiting exemplary embodiments, wherein the exemplary numbers represent like mechanisms throughout the various views of the drawings.

Fig. 1 is a schematic structural diagram of a first short-distance optical amplifying module provided in the present application.

Fig. 2 is a schematic structural diagram of a second short-distance optical amplifying module provided in the present application.

Fig. 3 is a schematic structural diagram of a third short-distance optical amplifying module provided in the present application.

Fig. 4 is a schematic structural diagram of a fourth short-distance optical amplifying module provided in the present application.

Fig. 5 is a schematic structural diagram of a fifth short-distance optical amplifying module provided in the present application.

Fig. 6 is a schematic diagram of a first structure of a lens assembly in a short-distance optical amplifying module provided by the present application.

Fig. 7 is a schematic diagram of a second structure of a lens assembly in the short-distance optical amplifying module provided by the present application.

Fig. 8 is a schematic diagram of a third structure of a lens assembly in the short-distance optical amplifying module provided by the present application.

Fig. 9 is a schematic diagram of a fourth structure of a lens assembly in the short-distance optical amplifying module provided in the present application.

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, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.

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

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

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

The application provides a short-range optical magnification module suitable for application to a head-mounted display device (Head mounted display, HMD), such as a VR head-mounted display device. The VR head mounted display device may include, for example, VR smart glasses or VR smart helmets, etc., to which the embodiments of the present application are not limited in terms of the specific form of the head mounted display device. Of course, the optical module provided in the embodiment of the application may also be applied to other types of electronic devices.

Along with the intelligent continuous promotion of wear-resisting display device product, the attention degree of eye information acquisition function is promoted gradually. The eye acquisition information can be used for eye movement tracking function, iris identification function, eye and periocular image acquisition, facial expression identification function and the like, and is mainly dependent on the acquired eye information of human eyes, and corresponding functions are realized through image processing and analysis. The current mainstream eye information acquisition scheme generally has two sets of key devices, namely an infrared light source and an infrared camera (IR camera) capable of capturing infrared light beams. Generally, the infrared light source is designed and positioned on the side, away from the display screen, of the near-eye display optical module, the infrared camera is generally positioned at the edge position of the product lens barrel, the requirements of the scheme on the placement position, the FOV, the depth of field, the inclination angle and the like of the infrared camera are relatively strict, and the infrared camera is placed at the edge position, so that the accuracy of acquiring the eye image information is lower.

With respect to the above background, in a first aspect, the present application provides a short-distance optical amplifying module, as shown in fig. 1 or fig. 2, the short-distance optical amplifying module includes: a display screen 40, and a second lens group 03, an optical receiving unit 50, and a first lens group 02 which are sequentially disposed along the light-emitting direction of the display screen 40.

The display beam emitted by the display screen 40 enters the human eye after passing through the second lens group 03 and the first lens group 02. In the VR head-mounted display device, after being processed by the second lens group 03 and the first lens group 02, a magnified image can be seen by human eyes, and an immersive effect of virtual reality is presented.

An optical selective reflection surface is disposed between the optical receiving unit 50 and the display screen 40, and is configured to reflect a target light beam in the human eye reflected light beam to the optical receiving unit 50 according to the first optical characteristic, so as to implement an eye information collecting function.

In this application, the eye information may include eyeball image information, eye and periocular image information, etc., and the eyeball image information, such as the condition of eyeball movement, may be used for an eye movement tracking function, or the identity recognition may be performed by capturing an iris image of the eyeball; the eyes and periocular images of human eyes can be acquired, the images can be displayed through the display area of the front panel, and eyes and facial images of a user can be observed outside the head-mounted display device; in addition, the change of the eyeballs and the eyes can be observed by shooting the images of the eyeballs and the eyes, so that the facial expression of the user is analyzed, and the emotional state of the user is obtained.

In this embodiment, the eye information is preferably eye and periocular image information, and human eyes and partial facial images are captured and displayed on a front panel of a head-mounted display such as MR glasses, so that the MR glasses can realize a dual-transmission function, and a wearer and surrounding people can see each other through the MR glasses, thereby improving interaction experience between the user and other people after wearing the MR glasses.

In other embodiments, the eye information may be other image information, and the corresponding function, such as an eye tracking function, is implemented through different image processing analysis manners.

It can be appreciated that the application provides a short-distance optical amplifying module, which is provided with an optical receiving unit 50 for realizing an eye information acquisition function, wherein the optical receiving unit 50 is arranged between lens groups for amplifying display beams emitted by a display screen 40, so that the problems that the optical receiving unit is protruded away from the display screen, is not attractive in appearance and is easy to cause dirt and collide are avoided.

With the optical receiving unit 50 as a demarcation point, a lens between the optical receiving unit 50 and the human eye forms a first lens group 02, a lens between the optical receiving unit 50 and the display screen 40 forms a second lens group 03, an optical selective reflection surface is arranged between the optical receiving unit 50 and the display screen 40, and is used for reflecting a target light beam in a human eye reflected light beam to the optical receiving unit 50, wherein the target light beam carries eye and periocular image information, forms an eye and periocular image according to the target light beam, and displays the eye and periocular image on a front panel of the head-mounted display after image processing. In this process, the reflected light beam of human eyes is refracted by the first lens group 02 and reflected by the optical selective reflecting surface, so that the inclination of the reflected light beam of human eyes can be reduced, and the problem of insufficient shooting definition caused by too close distance between human eyes and the optical receiving unit 50 and too large inclination of shooting by the optical receiving unit is avoided.

In the embodiment of the present application, the optical receiving unit 50 may be a camera, and in order to ensure effective recognition, the coverage of the camera at the human eye can be photographed by the camera is larger than the eye movement range, and the photographing range diameter D is greater than 4mm.

In the embodiment of the present application, the display screen 40 may be a self-luminous screen such as LCD, LED, OLED, micro-OLED, ULED, etc., or a reflective screen such as DMD, etc.

In fig. 1 and 2, the first lens group 02 and the second lens group 03 show only one lens, and in practice, each of the first lens group 02 and the second lens group 03 may include at least one optical element. Preferably, the distance d between the edges of the first lens group 02 and the second lens group 03 in the optical axis direction is larger than 3mm.

In an alternative embodiment of the present application, the second lens group 03 includes a folded light path assembly including a second quarter wave plate, a partially transmissive partially reflective mirror, a third quarter wave plate, and a reflective polarizer disposed in this order along the light exit direction of the display screen 40. The optical selective reflecting surface is disposed between the first lens group and the reflective polarizer, and the partially transmissive partially reflecting mirror is preferably a half mirror.

In this embodiment, the light emitted from the display screen is linearly polarized light, and is changed into circularly polarized light after passing through the second quarter wave plate, then sequentially passes through the partial transmission partial reflector and the third quarter wave plate, then is reflected by the reflective polarizer, passes through the third quarter wave plate, finally passes through the reflective polarizer, and forms a folded light path through the second quarter wave plate, the partial transmission partial reflector, the third quarter wave plate and the reflective polarizer which are sequentially arranged, so that the thickness of the optical module is greatly shortened, and the weight of the whole machine is reduced. In addition, because the optical selective reflection surface is arranged between the first lens group and the reflective polaroid, the optical selective reflection surface can not influence the folded light path, thereby facilitating the design of the folded light path and ensuring the imaging quality.

As shown in fig. 6, the lens group of the short-distance optical amplifying module is a 2-piece optical module, wherein the first lens group 02 is a first lens 20 with positive optical power, the second lens group 03 is a second lens 30 with positive optical power, and a surface 301 of the second lens 30 facing away from the display screen is a plane. The display beam emitted from the display screen is reflected by the 202 surface of the first lens 20 after passing through the second lens 30, and after being reflected again by the surface 302 of the second lens 30, the beam enters the human eye through the first lens 20, and the human eye can see the enlarged image of the display screen at the position 101. The human eye reflected light beam for eye information collection passes through the first lens 20, is reflected by the optical selective reflection surface and enters the optical receiving unit 50, and the optical receiving unit 50 can clearly image eyes to realize eye information collection. Specific optical parameters of the first lens 20 and the second lens 30 are shown in the following table:

table 1 specific optical parameters of lenses 20 and 30

As shown in fig. 7, the first lens group 02 is a first lens 500 having positive optical power, the second lens group 03 includes a third lens 70 and a second lens 60 sequentially disposed along the light emitting direction of the display screen 40, the second lens 60 and the third lens 70 each have positive optical power, and a surface of the second lens 60 facing away from the display screen is convex. The display beam emitted from the display screen is reflected by the surface 602 of the second lens 60 after passing through the third lens 70, and after being reflected again by the surface 702 of the third lens 70, the beam enters the human eye through the first lens 500 and the second lens 60, and the human eye is located at the position 101, so that the image magnified by the display screen can be seen. After passing through the first lens 500, the human eye reflected light beam for eye information acquisition is reflected by the surface 601 of the second lens 60 and enters the optical receiving unit 50, and the optical receiving unit 50 can clearly image human eyes to acquire eye information. Specific optical parameters of the first lens 500, the second lens 60, and the third lens 70 are shown in the following table:

table 2 specific optical parameters of lens 500, lens 60 and lens 70

As shown in fig. 8, the first lens group 02 is a first lens 80 having positive optical power, the second lens group 03 includes a third lens 100 and a second lens 90 sequentially disposed along the light emitting direction of the display screen 40, the third lens 100 has positive optical power, the second lens 90 has negative optical power, and a surface 901 of the second lens 90 facing away from the display screen is concave. The display beam emitted from the display screen is reflected by the surface 902 of the second lens 90 after passing through the third lens 100, and after being reflected again by the surface 1002 of the third lens 100, the beam enters the human eye through the first lens 80 and the second lens 90, and the human eye is located at 101 to see the magnified image of the display screen. After passing through the first lens 80, the human eye reflected light beam for eye information acquisition is reflected by the surface 901 of the second lens 90 and enters the optical receiving unit 50, and the optical receiving unit 50 can clearly image human eyes to acquire eye information. Specific optical parameters of the first lens 80, the second lens 90, and the third lens 100 are shown in the following table:

table 3 specific optical parameters of lens 80, lens 90 and lens 100

As shown in fig. 9, when the first lens group 02 is the first lens 110 with negative optical power, the second lens group 03 includes the third lens 130 and the second lens 120 sequentially disposed along the light emitting direction of the display screen 40, the second lens 120 and the third lens 130 each have positive optical power, and a surface 1201 of the second lens 120 facing away from the display screen is concave.

The display beam emitted from the display screen is reflected by the surface 1202 of the second lens 120 after passing through the third lens 130, and after being reflected again by the surface 1302 of the third lens 130, the beam enters the human eye through the first lens 110 and the second lens 120, and the human eye can see the image enlarged by the display screen 40 at the position 101. After passing through the first lens 110, the human eye reflected light beam for eye information acquisition is reflected by the surface 1201 of the second lens 120 and enters the optical receiving unit 50, and the optical receiving unit 50 can clearly image human eyes to acquire eye information. Specific optical parameters of the first lens 110, the second lens 120, and the third lens 130 are shown in the following table:

table 4 specific optical parameters of lens 110, lens 120 and lens 130

Surface of the body	Radius (mm)	Thickness (mm)	Material	Conic
					1	-100	3	APEL	19.5782309
2	Infinite number of cases	2.6622544		0
					3	-200	6.2691914	OKP	-46.191696
4	-64063996	4.6220937		0
					5	-68.02882	7.0005629	APEL	-3.9481777
6	-48.6258	2.6		-0.1925834

In an alternative embodiment of the present application, the optically selective reflective surface comprises at least one of:

as shown in fig. 1, an optical selective reflection film provided on any one of the target optical surfaces 001 in the second lens group 03;

as shown in fig. 2, a mirror M1 provided between the first lens group 02 and the second lens group 03, and an optically selective reflective film laminated on the mirror M1.

In an alternative embodiment of the present application, the first optical characteristic comprises at least one of: the polarization direction of the incident light, the angle of the incident light and the wavelength of the incident light; the optically selective reflective film comprises at least one of: polarization-selective reflective films, angle-selective reflective films, and wavelength-selective reflective films.

In an alternative embodiment of the present application, the light emitting device for implementing eye information collection may be the display screen 40 for generating a display beam, or may be an additional light emitting unit for emitting a collection beam to the human eye. The display screen 40 is directly used as the light-emitting equipment with the eye information acquisition function, so that the whole space and the construction cost of the short-distance optical amplifying module can be saved; the light emitting unit is used as the light emitting device with the eye information acquisition function, the design and manufacturing difficulty requirements of the optical selective reflecting surface are lower, the brightness of the target light beam reflected into the optical receiving unit 50 is higher, and the later calculation of eye image information is easier.

When the human eye reflected light beam is a display light beam emitted from the display screen 40, at least one of the following cases is included:

case 1: the optical selective reflection film is used for reflecting the light beams in the first polarization direction, the polarization direction of the display light beams emitted by the display screen is perpendicular to the first polarization direction, and a first quarter wave plate is arranged between the optical selective reflection film and human eyes; the display light beam passes through the first quarter wave plate for the first time in the process of being injected into the human eye, and passes through the first quarter wave plate for the second time in the process of being reflected to the optical selective reflection film by the human eye. In case 1, the light exit surface of the display screen 40 may be provided with a polarizing plate for ensuring that the polarization direction of the display beam exiting the display screen is perpendicular to the first polarization direction.

Case 2: the optical selective reflection film is an angle selective reflection film for reflecting light beams in a first incidence angle range, display light beams emitted by the display screen do not meet the first incidence angle range, and human eye reflection light beams meet the first incidence angle range.

Optionally, the first incident angle range is a range in which the incident angle is greater than the first angle, and when the target optical surface is a convex surface, the first angle is less than or equal to 40 °; when the target optical surface is a concave surface, the first angle is less than or equal to 25 degrees; when the target optical surface is a plane, the first angle is less than or equal to 32 °.

In an alternative embodiment of the present application, as shown in fig. 3 and fig. 4, when the reflected light beam of the human eye is the detection light beam emitted by the light emitting unit, the short-distance optical amplifying module further includes the light emitting unit 50; the light emitting unit 50 is for emitting a detection light beam satisfying the first optical characteristic to the human eye 01. When the human eye reflected light beam is a detection light beam emitted by the light emitting unit, the method comprises at least one of the following conditions:

case 1: when the optical selective reflection film is a polarization selective reflection film for reflecting the light beam in the first polarization direction, the polarization direction of the detection light beam emitted by the light emitting unit is the first polarization direction.

Case 2: the optical selective reflection film is an angle selective reflection film for reflecting the light beams in the second incidence angle range, the display light beams emitted by the display screen do not meet the second incidence angle range, and the detection light beams meet the second incidence angle range.

Case 3: the optical selective reflection film is a wavelength selective reflection film for reflecting a target wave band, the display light beam emitted by the display screen does not meet the target wave band, and the detection light beam meets the target wave band. It will be appreciated that the target band may be any band of the visible light band, or any band of the non-visible light band, for which the non-visible light selectable ranges include infrared light, ultraviolet light, and x-rays, in this embodiment, infrared light is preferred.

In a second aspect, the present application further provides another short-distance optical amplifying module, compared with the short-distance optical amplifying module in the above case 3, in addition to the wavelength selective reflection surface disposed between the optical receiving unit 50 and the display screen 40, the short-distance optical amplifying module reflects the detection light beam reflected by the human eye to the optical receiving unit to implement the eye information collecting function, and the visible light splitting surface disposed between the optical receiving unit 50 and the display screen 40, the visible light splitting surface is configured to reflect the display light beam reflected by the human eye to the optical receiving unit according to the second optical characteristic, so as to implement the eye information collecting function.

It can be appreciated that the application discloses a short-distance optical amplifying module, and the second lens group disposed in the light emitting direction of the display screen 40 is provided with a visible light splitting surface in addition to the wavelength selective reflecting surface. The wavelength selective reflecting surface is used for reflecting a detection light beam which emits a non-visible light wave band to human eyes to an optical receiving unit for realizing eye information acquisition, namely a conventional light emitting unit which generates the detection light beam is used as a light emitting device for eye information acquisition, preferably, the detection light beam emitted by the light emitting unit is infrared light or only infrared light, and the wavelength range is 700nm < w <1400nm; the visible light splitting surface is used for reflecting the display light beam reflected by human eyes to the optical receiving unit for realizing the eye information acquisition function, namely, the display screen 40 for generating the display light beam is used as a light emitting device of the eye information acquisition function. The short-distance optical amplification module is provided with the light-emitting device with the eye information acquisition function, so that the light-emitting device is convenient to temporarily switch, the use time of a single light source is reduced, and the failure rate of the light-emitting device is reduced.

It will be appreciated that the light emitting unit is controlled to be turned off when the display brightness of the display screen 40 is greater than the brightness threshold value, and turned on when the display brightness of the display screen is less than the brightness threshold value. Thus, the light emitting unit can be prevented from being in a starting state for a long time, and the energy consumption is increased invalidity.

More specifically, when the display screen 40 displays that the scene is in a bright field, the light emitted by the display screen 40 has enough light intensity, the light emitting unit for emitting infrared light is not started, the light emitted by the display screen irradiates the eyeball after passing through the two lens groups, and the light beam reflected by the eyeball is reflected to the light receiving unit through the visible light splitting surface, so as to realize eye information acquisition. When the display screen 40 displays that the scene is in the dark field, the light intensity of the emergent light of the display screen 40 is insufficient, the light-emitting unit is started, the infrared detection light beam is emitted to the eyeball by the light-emitting unit, and the detection light beam reflected by the eyeball is reflected to the light-receiving unit through the wavelength selective film, so that the eye information collection is realized. The sensing device is used for identifying the brightness degree of the display screen 40, controlling the opening and closing of the light emitting unit, fully utilizing the light emitted by the display screen 40 and improving the light energy utilization rate.

In an alternative embodiment of the present application, the wavelength selective reflective surface comprises at least one of:

as shown in fig. 5, a wavelength selective reflection film provided on the first optical surface 001 of the second lens group 03;

a first reflecting mirror (not shown) disposed between the optical receiving unit and the display screen, and a wavelength selective reflecting film laminated on the first reflecting mirror;

the visible light splitting surface comprises at least one of the following:

as shown in fig. 5, a visible light splitting film provided on the second optical surface 002 of the second lens group 03;

a second reflecting mirror (not shown in the figure) disposed between the optical receiving unit and the display screen, and a visible light splitting film laminated on the second reflecting mirror.

It is understood that each of the first lens group and the second lens group may include at least one optical element such as a lens, and the first optical surface and the second optical surface may be any surface of any lens in the second lens group.

In an alternative embodiment of the present application, the short-range optical amplifying module includes at least one of the following:

case 1: the first mirror and the second mirror may be the same mirror or different mirrors; when the first reflecting mirror and the second reflecting mirror are the same reflecting mirror, the wavelength selective reflecting film and the visible light splitting film are stacked on the reflecting mirror; when the first reflecting mirror and the second reflecting mirror are different reflecting mirrors, the wavelength selective reflecting film and the visible light splitting film are respectively arranged on the surfaces of the corresponding reflecting mirrors.

Case 2: the first optical surface and the second optical surface may be the same optical surface or different optical surfaces; when the first optical surface and the second optical surface are the same optical surface, the wavelength selective reflection film and the visible light splitting film are stacked on the same surface of the same lens in the second lens group; when the first optical surface and the second optical surface are different optical surfaces, the wavelength selective reflection film and the visible light splitting film are arranged on different surfaces of the same lens in the second lens group, or the wavelength selective reflection film and the visible light splitting film are arranged on surfaces of different lenses in the second lens group.

It can be understood that the light-emitting angle of the display beam emitted by the display screen is generally different from that of the detection beam emitted by the light-emitting unit, so that the visible light splitting film and the wavelength selective reflecting film can be arranged on different optical surfaces, the light path design and the position design of the light-emitting unit are more convenient, and in addition, films are respectively coated on different optical surfaces, so that the difficulty of a film coating process can be greatly reduced.

In an alternative embodiment of the present application, the second optical characteristic comprises at least one of: the polarization direction and the angle of the incident light; the visible light splitting surface comprises at least one of the following: a polarization-selective reflective film and an angle-selective reflective film.

In an alternative embodiment of the present application, the visible light splitting surface is a polarization selective reflection film disposed on the second optical surface of the second lens group and used for reflecting the light beam with the first polarization direction, the polarization direction of the display light beam emitted from the display screen is perpendicular to the first polarization direction, and a first quarter wave plate is further disposed between the visible light splitting surface and the human eye; the display light beam passes through the first quarter wave plate for the first time in the process of being injected into human eyes, and passes through the first quarter wave plate for the second time in the process of being reflected to the visible light splitting surface by human eyes.

In an alternative embodiment of the present application, the visible light splitting surface is an angle selective reflection film disposed on the second optical surface of the second lens group and used for reflecting the light beam in the first incident angle range, the display light beam emitted from the display screen does not satisfy the first incident angle range, and the display light beam reflected by the human eye satisfies the first incident angle range.

In an alternative embodiment of the present application, the first incident angle range is a range in which the incident angle is greater than the first angle, and when the second optical surface is convex, the first angle is less than or equal to 40 °; when the second optical surface is concave, the first angle is less than or equal to 25 degrees; when the second optical surface is a plane, the first angle is less than or equal to 32 degrees.

In this embodiment, the light emitting unit may be disposed on any one side of the first lens group 02 and the second lens group 03, preferably, the light emitting unit is disposed on a side of the first lens group 02 away from the second lens group 03, i.e. on a side close to the human eye, so that the light emitted by the light emitting unit can be directly irradiated to the human eye, and light intensity loss caused by light passing through the lens is reduced.

In a third aspect, the present application provides a head mounted display comprising: the short-range optical amplification module according to any one of the first or second aspects.

In the embodiment of the application, the type of the head-mounted display is not limited, and any one of VR head-mounted display device, AR head-mounted display device and MR head-mounted display device may be included.

In a fourth aspect, the present application provides a virtual reality system comprising a head mounted display screen as in any of the third aspects, and an external operating unit establishing a connection with the head mounted display.

The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.

Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims (10)

1. A short-range optical amplification module, comprising:

the display device comprises a light emitting unit, a display screen, a second lens group, an optical receiving unit and a first lens group, wherein the second lens group, the optical receiving unit and the first lens group are sequentially arranged along the light emitting direction of the display screen;

the display light beam emitted by the display screen enters human eyes after passing through the second lens group and the first lens group;

the light emitting unit is used for emitting detection light beams in a non-visible light wave band to the human eyes and can correspondingly enter a dormant or starting state according to the bright-dark state of the display screen;

a wavelength selective reflecting surface and a visible light splitting surface are arranged between the optical receiving unit and the display screen; the wavelength selective reflecting surface is used for reflecting the detection light beam reflected by human eyes to the optical receiving unit so as to realize an eye information acquisition function; the visible light beam splitting surface is used for reflecting the display light beam reflected by the human eyes to the optical receiving unit so as to realize the eye information acquisition function.

2. The short-range optical amplifying module according to claim 1,

the wavelength selective reflective surface comprises at least one of:

a wavelength selective reflective film disposed on the first optical surface of the second lens group;

a first mirror provided between the first lens group and the second lens group, and a wavelength selective reflection film laminated on the first mirror;

the visible light splitting surface comprises at least one of the following:

a visible light splitting film provided on a second optical surface of the second lens group;

and a second mirror provided between the first lens group and the second lens group, and a visible light splitting film laminated on the second mirror.

3. The short-range optical amplifying module according to claim 1,

the visible light splitting surface is used for reflecting the display light beam reflected by human eyes to the optical receiving unit according to target optical characteristics;

the target optical characteristics include at least one of: the polarization direction and the angle of the incident light;

the visible light splitting surface comprises at least one of the following: a polarization-selective reflective film and an angle-selective reflective film.

4. The short-range optical amplifying module according to claim 3,

the visible light splitting surface is a polarization selective reflecting film which is arranged on the second optical surface of the second lens group and used for reflecting light beams in a first polarization direction, the polarization direction of the display light beams which reach the polarization selective reflecting film from the display screen is orthogonal to the first polarization direction, and a first quarter wave plate is further arranged on one side of the polarization selective reflecting film, which is close to the first lens group; the display light beam passes through the first quarter wave plate for the first time in the process of being incident into the human eye, and passes through the first quarter wave plate for the second time in the process of being reflected to the polarization selective reflection film by the human eye.

5. The short-range optical amplifying module according to claim 3,

the visible light splitting surface is an angle selective reflecting film which is arranged on the second optical surface of the second lens group and used for reflecting the light beams in the first incidence angle range, the display light beams emitted by the display screen do not meet the first incidence angle range, and the display light beams reflected by human eyes meet the first incidence angle range.

6. The short-range optical amplifying module according to claim 5, wherein,

the first range of incidence angles is a range of incidence angles greater than the first angle,

when the second optical surface is a reflective surface having negative optical power, the first angle is less than or equal to 40 °; when the second optical surface is a reflective surface having positive optical power, the first angle is less than or equal to 25 °; when the second optical surface is a plane, the first angle is less than or equal to 32 °.

7. The short-range optical amplification module of any one of claim 1 to 6, wherein,

the second lens group comprises a folding light path component, the folding light path component comprises a second quarter wave plate, a partial transmission partial reflector, a third quarter wave plate and a reflective polarizer which are sequentially arranged along the light emitting direction of the display screen, and the wavelength selective reflecting surface and the visible light splitting surface are arranged between the first lens group and the reflective polarizer.

8. The short-range optical amplifying module according to claim 7,

when the first lens group is a first lens with positive focal power, the second lens group comprises at least one of the following:

a second lens having positive optical power, the surface of the second lens facing away from the display screen being a plane;

a third lens and a second lens are sequentially arranged along the light emitting direction of the display screen, the second lens and the third lens both have positive focal power, and the surface of the second lens, which faces away from the display screen, is a convex surface;

a third lens and a second lens are sequentially arranged along the light emitting direction of the display screen, the third lens has positive focal power, the second lens has negative focal power, and the surface of the second lens, which faces away from the display screen, is a concave surface;

when the first lens group is a first lens with negative focal power, the second lens group comprises a third lens and a second lens which are sequentially arranged along the light emitting direction of the display screen, the second lens and the third lens both have positive focal power, and the surface of the second lens, deviating from the display screen, is a concave surface.

9. A head mounted display comprising a short-range optical amplifying module according to any of claims 1 to 8.

10. A virtual reality system comprising the head mounted display of claim 9, and an external operating unit establishing a connection with the head mounted display.