CN115576105A

CN115576105A - Binocular augmented reality near-to-eye display device and augmented reality display equipment

Info

Publication number: CN115576105A
Application number: CN202210988343.8A
Authority: CN
Inventors: 李艳; 崔海涛; 李星
Original assignee: Goolton Technology Co ltd
Current assignee: Goolton Technology Co ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2023-01-06

Abstract

The invention relates to a binocular augmented reality near-to-eye display device and augmented reality display equipment, wherein the binocular augmented reality near-to-eye display device comprises: the display source is arranged on a main optical axis of the collimation system and used for loading and outputting an image; the collimation system is positioned on the light emergent surface of the display source, and couples the image output by the display source into the waveguide plate through the coupling-in diffraction optical element after collimation correction; the coupling-in diffraction optical element is arranged on an emergent light path of the collimation system, comprises a first coupling-in diffraction optical element and a second coupling-in diffraction optical element, is respectively arranged on the upper surface and the lower surface of the waveguide plate, and is respectively formed by stacking and compounding a first polarizer holographic grating and a second polarizer holographic grating; the waveguide plate is used for transmitting the coupled light to the coupling-out optical element in a total reflection mode; the light coupling optical element is arranged in the coupling-out area of the waveguide plate, comprises a left eye light coupling optical element and a right eye light coupling optical element, is used for coupling light out to the left eye and the right eye of a person respectively, and comprises a first non-polarized light splitting film array and a second non-polarized light splitting film array.

Description

Binocular augmented reality near-to-eye display device and augmented reality display equipment

Technical Field

The present disclosure relates to the field of augmented reality display technologies, and in particular, to a binocular augmented reality near-to-eye display device and augmented reality display apparatus.

Background

Augmented Reality (AR) is a fusion of the surrounding visual environment with virtual graphical information, i.e. real environment and virtual objects are superimposed on the same picture or space in real time. With the development of novel display technologies such as dynamic environment modeling and high-light-efficiency light sources at the present stage, the AR equipment will further influence and even change some information interaction modes in production and life of various industries.

In an AR near-eye display system, the most core optical hardware part is a waveguide coupling element, and the coupling element for AR near-eye display which is widely applied at present mainly comprises a light splitting film which is arranged in an array based on geometric optics; and volume holographic gratings based on diffractive optics, and the like. The light splitting films arranged in an array are generally a plurality of semi-transparent semi-reflective films which are arranged in parallel at equal intervals and only have a certain splitting ratio for S polarized light waves (polarization vectors are perpendicular to the plane) or P polarized light waves (polarization vectors are in the plane), so that the light effect of the waveguide lens is very low, the final eye-entering brightness is reduced greatly, and the eye-entering brightness requirement in operation on certain specific working occasions cannot be met. On the other hand, most diffraction optical elements at the present stage adopt volume holographic gratings which have high diffraction efficiency and certain advantages in the aspects of process difficulty and cost. However, the volume holographic grating has a narrow bandwidth and strict angular selectivity, which limits the size of the field of view, thus causing the FOV of the volume holographic grating waveguide coupling system to be difficult to expand, and also becoming a core pain point that limits the wide application of the volume holographic grating. In addition, since the diffraction efficiency of a single holographic grating is low, the brightness of the coupled-out image is too low, and the brightness requirement of the augmented reality display device for the output image cannot be met.

Disclosure of Invention

In order to overcome the problems in the related art, the present disclosure provides a binocular augmented reality near-to-eye display device and augmented reality display apparatus, thereby achieving simultaneous diffraction of left-handed polarized light beams and right-handed polarized light beams, accomplishing high-efficiency waveguide coupling, simultaneously achieving pupil expansion, ensuring continuity and integrity of a final image, and also improving light and dark stripes of a displayed image.

According to a first aspect of embodiments of the present disclosure, there is provided a binocular augmented reality near-to-eye display device, including: a display source, a collimating system, an incoupling diffractive optical element, a waveguide plate and an outcoupling optical element;

the display source is arranged on a main optical axis of the collimation system and used for loading and outputting an image;

the collimation system is positioned on the light emergent surface of the display source and is used for collimating and correcting the image output by the display source and then coupling the image into the waveguide plate through the coupling-in diffraction optical element;

the incoupling diffraction optical element is arranged on an emergent light path of the collimation system and comprises a first incoupling diffraction optical element and a second incoupling diffraction optical element, wherein the first incoupling diffraction optical element and the second incoupling diffraction optical element are respectively arranged on the upper surface and the lower surface of the waveguide plate, and the first incoupling diffraction optical element and the second incoupling diffraction optical element are respectively formed by stacking and compounding a first polarizer holographic grating and a second polarizer holographic grating;

the waveguide plate is used for transmitting the coupled light to the light coupling-out optical element in a total reflection mode;

the coupling optical element is arranged in a coupling area of the waveguide plate, comprises a left eye coupling optical element and a right eye coupling optical element, and is used for coupling light out to the left eye and the right eye of a person respectively, wherein the left eye coupling optical element comprises a first non-polarized light splitting film array, and the right eye coupling optical element comprises a second non-polarized light splitting film array.

In one embodiment, preferably, the first incoupling diffractive optical element and the second incoupling diffractive optical element are identical.

In one embodiment, preferably, the first polarizer holographic grating comprises a left-handed polarizer holographic grating and the second polarizer holographic grating comprises a right-handed polarizer holographic grating.

In one embodiment, preferably, the first and second arrays of non-polarizing splitting films are identical, but are symmetrically arranged.

In one embodiment, preferably, the first and second non-polarizing spectroscopic film arrays respectively include a plurality of non-polarizing spectroscopic film array substrates, and the plurality of non-polarizing spectroscopic film array substrates are arranged in parallel and inclined.

In one embodiment, preferably, the plurality of unpolarized light splitting film array substrates are arranged in parallel at equal intervals, the interval between any two unpolarized light splitting film array substrates is a preset interval, and the inclination angle of the unpolarized light splitting film array substrates is a preset angle.

In one embodiment, preferably, the collimating system includes a first lens, a second lens, a third lens and a fourth lens coaxially disposed in sequence from an object plane to an image plane, where the first lens is a plano-convex lens, the second lens and the third lens are meniscus lenses, and the fourth lens is a plano-convex lens.

In one embodiment, preferably, the first surface of the first lens is a plane, the second surface of the first lens is a convex surface and is a spherical surface, the first surfaces of the second lens and the third lens are both concave surfaces and are spherical surfaces, the second surfaces are both convex surfaces and are spherical surfaces, and the first surface of the fourth lens is a plane, and the second surface is a convex surface and is an aspheric surface.

In one embodiment, preferably, the radius of curvature of the convex surface of the second lens is the same size as the radius of curvature of the concave surface of the first surface of the third lens, opposite in sign, and cemented with each other such that the second lens and the third lens form an integral cemented lens, and the radius of curvature of the convex surface of the second surface of the fourth lens is larger than the radius of curvature of the convex surface of the second surface of the first lens.

In one embodiment, preferably, the display source comprises a micro display screen, the micro display screen is mounted in a display screen mounting groove of a binocular augmented reality near-to-eye display device main body through two symmetrically arranged display screen mounting components, a transparent baffle is arranged in the display screen mounting groove, a plurality of dustproof air vents are arranged on the binocular augmented reality near-to-eye display device main body, and the display screen mounting groove is communicated with the external environment through the dustproof air vents;

the display screen mounting assembly includes:

the main shaft is rotatably connected in the binocular augmented reality near-to-eye display device main body, one end of the main shaft is located in the first installation cavity, the other end of the main shaft is located in the containing cavity, connecting threads are arranged at one end of the main shaft located in the containing cavity, a driving motor is arranged on the main shaft, and the driving motor is used for driving the main shaft to rotate;

the threaded connecting block is in threaded connection with one end, located in the containing cavity, of the main shaft, a clamping groove is formed in the threaded connecting block, and the micro display screen is inserted into the clamping groove;

a first gear keyed to the main shaft;

the binocular augmented reality near-eye display device comprises a first rotating shaft and a second gear, wherein the first rotating shaft is rotatably connected in a binocular augmented reality near-eye display device main body, one end of the first rotating shaft is positioned in a first mounting cavity, the other end of the first rotating shaft is positioned in a display screen mounting groove, a second gear is connected to the first rotating shaft in a sliding key mode, a first driving piece is arranged on the second gear, the first driving piece is used for driving the second gear to slide along the first rotating shaft, and the second gear is used for being meshed with the first gear;

the mounting groove body is fixedly connected in a display screen mounting groove, a lead screw is rotationally connected in the mounting groove body, a third gear is connected to the lead screw in a key mode, one end of the first rotating shaft, which is located in the mounting groove body, is connected with a fourth gear in a key mode, and the third gear is meshed with the fourth gear;

the cleaning brush rod and the waving gear are coaxially and rotatably connected to the lead screw nut mounting block, the waving gear is meshed with the rack, and a second driving piece is arranged on the rack and used for driving the rack to slide along the guide rod;

the first bevel gear is connected to the main shaft in a key mode;

the second rotating shaft is rotatably connected in the binocular augmented reality near-to-eye display device body, a sliding key at one end of the second rotating shaft, which is positioned in the first installation cavity, is connected with a second bevel gear, a third driving piece is arranged on the second bevel gear, the third driving piece is used for driving the second bevel gear to slide along the second rotating shaft, the second bevel gear is used for being meshed with the first bevel gear, and a key at one end of the second rotating shaft, which is positioned in the second installation cavity, is connected with a third bevel gear;

the third rotating shaft is rotatably connected in the binocular augmented reality near-to-eye display device body, one end of the third rotating shaft, which is positioned in the second mounting cavity, is connected with a fourth bevel gear, the fourth bevel gear is meshed with the third bevel gear, and one end of the third rotating shaft, which is positioned in the air outlet cavity, is fixedly connected with a fan;

the heater is fixedly connected to the inner wall of the air outlet cavity, and the dust screen is fixedly connected in the air outlet cavity;

the liquid storage cavity is arranged in the binocular augmented reality near-to-eye display device body, and cleaning liquid is arranged in the liquid storage cavity;

the outlet pipe, outlet pipe fixed connection be in on the threaded connection piece, install miniature suction pump on the outlet pipe, the end of intaking of miniature suction pump communicates with each other with the stock solution chamber.

In one embodiment, preferably, the apparatus further comprises:

binocular augmented reality near-to-eye display device monitoring system, binocular augmented reality near-to-eye display device monitoring system is used for monitoring binocular augmented reality near-to-eye display device's operating condition, and the suggestion of reporting to the police when binocular augmented reality near-to-eye display device operating condition is not good, binocular augmented reality near-to-eye display device monitoring system includes:

the first light intensity sensor is arranged on the left-eye coupling-out diffraction optical element and used for detecting the light intensity of the grating stripes of the left-eye coupling-out diffraction optical element;

a second light intensity sensor disposed on the right-eye coupling-out diffractive optical element for detecting light intensities of grating stripes of the right-eye coupling-out diffractive optical element;

a first wavelength sensor disposed on the left-eye outcoupling diffractive optical element for detecting a wavelength of a grating of the left-eye outcoupling diffractive optical element;

a second wavelength sensor disposed on the right-eye out-coupling diffractive optical element for detecting a wavelength of a grating of the right-eye out-coupling diffractive optical element;

the timer is arranged on the binocular augmented reality near-to-eye display device and used for detecting the total using time of the binocular augmented reality near-to-eye display device;

the controller, the alarm, the controller with first light intensity sensor the second light intensity sensor first wavelength sensor the second wavelength sensor the timer and alarm electricity are connected, the controller is based on first light intensity sensor the second light intensity sensor first wavelength sensor the timer with second wavelength sensor control the alarm is reported to the police, including following step:

the method comprises the following steps: calculating a log-average grating contrast of the left-eye coupling-out diffractive optical element and the right-eye coupling-out diffractive optical element based on a first light intensity sensor, a second light intensity sensor, and equation (1):

wherein Δ is a log-average grating contrast of the left-eye coupling-out diffractive optical element and the right-eye coupling-out diffractive optical element, ln is a logarithm with e as a base, β is a detection error coefficient of the first light intensity sensor and the second light intensity sensor, and W is a detection error coefficient of the first light intensity sensor and the second light intensity sensor _1max Is the maximum detection value, W, of the first light intensity sensor during the detection period _1min Is the minimum detected value, W, of the first light intensity sensor during the detection period _2max Is the maximum value, W, of the second light intensity sensor during the detection period _2min Is the minimum detection value of the second light intensity sensor in the detection period;

step two: calculating the actual working state coefficient of the binocular augmented reality near-to-eye display device based on the first wavelength sensor, the second wavelength sensor, the timer, the step one and a formula (2):

wherein α is an actual working state coefficient of the binocular augmented reality near-eye display device, Δ is a log-average grating contrast of the left-eye coupled-out diffractive optical element and the right-eye coupled-out diffractive optical element, and d ₁ Thickness of the diffractive optical element for left eye coupling out, d ₂ Thickness of the diffractive optical element for right eye coupling out, μ is the refractive index of the waveguide plate, λ ₁ Is a value detected by the first wavelength sensor, λ ₂ Is a detected value of the second wavelength sensor, λ ₀ Wavelength of light in air, gamma ₁ Coupling strength of the grating of the diffractive optical element, gamma, for the left eye ₂ Coupling strength of the grating of the diffractive optical element, gamma, for the right eye ₀ Coupling intensity of a preset grating of the coupling-in diffractive optical element is epsilon, the Bragg mismatch amount of the binocular augmented reality near-to-eye display device is epsilon, T is a detection value of the timer, and TH is the service life of the binocular augmented reality near-to-eye display device;

step three: the controller compares the actual working state coefficient of the near-to-eye display device of the binocular augmented reality with the preset working state coefficient range of the near-to-eye display device of the binocular augmented reality, if the actual working state coefficient of the near-to-eye display device of the binocular augmented reality is not in the preset working state coefficient range of the near-to-eye display device of the binocular augmented reality, then the alarm gives an alarm.

In one embodiment, preferably, the apparatus further comprises a detection system, the detection system comprising:

the detection modules are arranged at intervals on the light incidence surface of the first coupling-in diffraction optical element and used for collecting the actual information of the incident light in the area where the first coupling-in diffraction optical element is located, and the actual information of the incident light comprises: actual light intensity information;

the storage module stores the serial number of each detection module and corresponding position information;

the first parameter acquisition unit is used for acquiring actual operation parameters of the detection module;

the first judgment module is used for comparing the actual operation parameter of each detection module with the corresponding rated operation parameter and judging that each detection module is a normal detection module or an abnormal detection module according to the comparison result;

the second parameter acquisition unit is used for acquiring actual operation parameters of the collimation system;

the second judgment module is used for comparing the actual operation parameters of the collimation system with the corresponding rated operation parameters and judging the collimation system to be a normal collimation system or an abnormal collimation system according to the comparison result;

the third judgment module is connected with the detection modules, compares the actual information of the incident light collected by each detection module with the range of the corresponding reference information, and judges that the area corresponding to a certain detection module is an abnormal area when the actual information of the incident light collected by the certain detection module is not in the range of the corresponding reference information and the detection module is a normal detection module;

the counting module is used for counting the abnormal areas;

the construction unit is connected with the storage module and the detection module, and constructs an actual incidence area based on the position information of the target detection module, and the target detection module: a detection module for collecting incident light emitted by the collimation system;

the matching unit is used for matching the actual incidence area with a standard incidence area to obtain a matching result;

and the adjustment strategy making unit is used for making an adjustment strategy for the detection module, the collimation system and the display source based on the number and the positions of the abnormal areas, the judgment result of the second judgment module and the matching result of the matching unit.

According to a second aspect of the embodiments of the present disclosure, there is provided an augmented reality display apparatus including:

the binocular augmented reality near-eye display device of any one of the first aspect.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

1) The invention adopts the polarizer holographic grating (PVG) as the optical coupling device to solve the problem of narrow field angle of the volume holographic grating, and adopts the coupling-in diffraction optical element formed by stacking and compounding two layers of polarizer holographic gratings (PVG), thereby realizing the simultaneous diffraction of the left-handed polarized light beam and the right-handed polarized light beam and completing the high-efficiency waveguide coupling.

2) According to the invention, the diffractive optical element 1 and the diffractive optical element 2 which are completely the same and are formed by stacking and compounding two layers of polarizer holographic gratings (PVG) are used as a light coupling-in device, so that the lost 0-order diffraction light is effectively reused, the light efficiency is improved, and the defects that the single holographic grating adopted in the prior art is low in diffraction efficiency, the brightness of a coupled image is too low, and the brightness requirement of an augmented reality display device on an output image cannot be met are overcome. Meanwhile, pupil expansion is realized, the continuity and the integrity of the final image are ensured, and the bright and dark stripes of the displayed image can be improved.

3) The invention adopts a non-polarized light splitting film array as a light out-coupling device. Due to the use of the non-polarization light splitting film array, the design of the light machine collimation system in the waveguide display system can be free from the constraint of the traditional light path design, and a full-lens type light path design is adopted.

4) The collimating system of the optical-mechanical device has the advantages of small number of lenses, simple structure, effective reduction of volume and weight, suitability for wearing by human bodies, and great reduction of manufacturing cost due to low process requirements and easy realization.

5) The invention can realize binocular display by only using a single image source without respectively providing one image source for the left eye and the right eye, which undoubtedly has certain advantages on the volume, the weight, the power consumption and the like of the system.

6) In the invention, the phase of the liquid crystal can be directly regulated and controlled by the compiling control module, the polarization state of the waveguide incident beam is changed in time sequence with enough refreshing frequency (> 120 Hz), and when certain parallax exists in the time sequence picture content transmitted to the left eye and the right eye, a wearer can obtain picture stereoscopic impression based on binocular parallax, thereby realizing near-eye waveguide binocular stereoscopic display.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural diagram illustrating a binocular augmented reality near-eye display device according to an exemplary embodiment.

Fig. 2 is a schematic structural diagram illustrating a collimation system in a binocular augmented reality near-eye display device according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

As shown in fig. 1, the binocular augmented reality near-eye display device includes: a display source 11, a collimating system 12, an incoupling diffractive optical element 13, a waveguide plate 14 and an outcoupling optical element 15;

the display source 11 is arranged on a main optical axis of the collimation system 12 and used for loading and outputting an image; the display source comprises a micro display which is a 0.39-inch OLED micro display screen and has the characteristics of high brightness, high contrast and low power consumption.

The collimating system 12 is located on the light emitting surface of the display source 11, and is configured to collimate and correct an image output by the display source 11 and couple the image into the waveguide plate 14 through the coupling-in diffractive optical element 13;

the incoupling diffractive optical element 13 is disposed on an outgoing light path of the collimating system 12, and includes a first incoupling diffractive optical element 131 and a second incoupling diffractive optical element 132, where the first incoupling diffractive optical element 131 and the second incoupling diffractive optical element 132 are disposed on an upper surface and a lower surface of the waveguide plate 14, respectively, and the first incoupling diffractive optical element 131 and the second incoupling diffractive optical element 132 are formed by stacking and compounding a first polarizer holographic grating and a second polarizer holographic grating, respectively;

the waveguide plate 14 is configured to transmit the coupled light to the light-coupling optical element 15 in a total reflection manner;

the light coupling optical element 15 is arranged in the coupling-out area of the waveguide plate, and comprises a left eye light coupling optical element 151 and a right eye light coupling optical element 152, which are used for coupling out light to the left eye and the right eye of a person respectively, wherein the left eye light coupling optical element comprises a first non-polarized light splitting film array, and the right eye light coupling optical element comprises a second non-polarized light splitting film array.

In one embodiment, preferably, the first incoupling diffractive optical element 131 and the second incoupling diffractive optical element 132 are identical.

In one embodiment, preferably, the first polarizer holographic grating PVG1 comprises a left-handed polarizer holographic grating and the second polarizer holographic grating PVG2 comprises a right-handed polarizer holographic grating.

Wherein the helical directions of the chiral dopants in the PVG1 and PVG2 materials are orthogonal, so that the liquid crystal molecules therein rotate in opposite directions but with the periodicity remaining the same. Because the polarization property of the polarizer holographic grating shows that the polarizer holographic grating diffracts only circularly polarized light in a single rotation direction, and directly transmits circularly polarized light in another orthogonal rotation direction, the polarizer holographic grating can diffract left-handed circularly polarized light beams and right-handed circularly polarized light beams respectively so as to realize high-efficiency waveguide coupling.

In order to effectively reuse the lost 0-order diffraction light and improve the light efficiency, the invention adopts two identical diffractive optical elements 1 and 2 which are formed by stacking and compounding two layers of polarizer holographic gratings (PVG) as light coupling devices and are respectively arranged on the upper surface and the lower surface of a waveguide plate, thus simultaneously realizing pupil expansion, ensuring the continuity and the integrity of a final image and improving the light and shade stripes of a displayed image.

For example, the non-polarized light splitting film array comprises four non-polarized light splitting film array substrates, the four non-polarized light splitting film array substrates are arranged at equal intervals, the distance between the four non-polarized light splitting film array substrates is 4.26mm, the inclination angle between the non-polarized light splitting film array substrates and the waveguide plate substrate is 25 degrees, and the thickness of the waveguide plate substrate is 2mm.

As shown in fig. 2, in one embodiment, the collimating system 12 preferably includes a first lens 121, a second lens 122, a third lens 123 and a fourth lens 124 coaxially disposed in order from an object plane to an image plane, wherein the first lens 121 is a plano-convex lens, the second lens 122 and the third lens 123 are meniscus lenses, and the fourth lens 124 is a plano-convex lens.

In one embodiment, preferably, the first surface of the first lens 121 is a plane, the second surface of the first lens 121 is a convex surface and is a spherical surface, the first surfaces of the second lens 122 and the third lens 123 are both concave surfaces and are spherical surfaces, the second surfaces are both convex surfaces and are spherical surfaces, and the first surface of the fourth lens 124 is a plane, and the second surface is a convex surface and is an aspheric surface.

In one embodiment, preferably, the radius of curvature of the convex surface of the second lens 122 is the same as the radius of curvature of the concave surface of the first surface of the third lens 123, has opposite signs, and is cemented with each other, such that the second lens 122 and the third lens 123 form an integral cemented lens, and the radius of curvature of the convex surface of the second surface of the fourth lens 124 is greater than the radius of curvature of the convex surface of the second surface of the first lens 121. The first lens, the second lens, the third lens and the fourth lens are all made of glass.

The present invention employs a polarizer holographic grating (PVG) as an optical coupling element. The polarizer holographic grating (PVG) utilizes the rotation and arrangement of liquid crystal molecules in space to generate anisotropic periodic variation of refractive index, thereby realizing a novel grating simultaneously having the characteristics of bulk effect and phase regulation. Therefore, in the diffraction characteristic, the PVG can realize efficient single-stage large-angle diffraction under the Bragg body effect, also shows the larger response bandwidth and the unique polarization selectivity which are special for the phase grating, and is very suitable for the coupling of a waveguide system. Meanwhile, the light is coupled in twice to effectively reuse the lost 0-level diffraction light, so that the light efficiency is improved, pupil expansion can be realized, the continuity and integrity of the final image are ensured, and the light and dark stripes of the displayed image are improved.

The working principle of the binocular augmented reality near-to-eye display device is as follows: the light emitted by the microdisplay is collimated by the collimating system and enters the incoupling diffractive optical element 1. Since the microdisplay is an OLED display, such an image source is a non-polarized image source, and non-polarized light can be considered to contain equal amounts of left-and right-polarized light components. The incoupling diffraction optical element is formed by stacking and compounding two layers of polarizer holographic gratings (PVG), wherein the spiral directions of chiral dopants in PVG1 and PVG2 are orthogonal, so that the rotation directions of liquid crystal molecules in the PVG1 and PVG2 are opposite but the periodicity of the liquid crystal molecules is kept the same, and the polarization characteristics of the polarizer holographic gratings are that the polarizer holographic gratings only diffract circularly polarized light in a single rotation direction, and the polarizer holographic gratings directly transmit circularly polarized light in the other orthogonal rotation direction, so that left-handed circularly polarized light beams and right-handed circularly polarized light beams in unpolarized light can be diffracted respectively, and high-efficiency waveguide coupling is realized. The left-hand polarized light beam and the right-hand polarized light beam are respectively diffracted and coupled into the waveguide plate towards two directions, but only negative first-order diffracted light in the diffracted light is coupled into the waveguide plate, 0-order diffracted light is vertically transmitted out of the waveguide and is incident into the coupling diffractive optical element 2 to be diffracted, and then negative first-order diffracted light in the diffracted light is also coupled into the waveguide plate. When the four beams of diffracted light are at an angle meeting the total reflection condition of the waveguide medium, the four beams of diffracted light are respectively transmitted to the coupling-out optical element in two directions in a total reflection mode. The light-coupling optical elements are respectively composed of an identical but symmetrically arranged non-polarized light-splitting film array. Due to the fact that the non-polarization light splitting film array is optimized in design of the film system, the non-polarization light splitting film array can directly couple out circularly polarized light, and uniformity of brightness of light entering eyes can be guaranteed through a set light splitting ratio. Then the last four diffracted lights are coupled out by the coupling-out optical element to the left and right eyes respectively for imaging. Therefore, the propagation period of the light in the optical waveguide is increased, the pupil gap of the light in each field of view is eliminated, the pupil expansion is realized, the continuity and the integrity of the final image are ensured, and the light and shade stripes of the displayed image can be improved. Therefore, the binocular display can be realized by using a single image source, and the left eye and the right eye are not required to be provided with one image source respectively, which undoubtedly has certain advantages on the volume, the weight, the power consumption and the like of the system. Further, for the liquid crystal type image source, the phase of the liquid crystal can be directly regulated and controlled through compiling the control module, and the polarization state of the waveguide incident beam is changed in time sequence with enough refreshing frequency (> 120 Hz). Therefore, when certain parallax exists in the time sequence picture content transmitted into the left eye and the right eye, the wearer can obtain picture stereoscopic impression based on binocular parallax, and near-eye waveguide binocular stereoscopic display is achieved.

In one embodiment, further comprising a detection system, the detection system comprising:

a plurality of detection modules, which are arranged at intervals on the light incident surface of the first incoupling diffractive optical element, and are used for collecting the actual information of the incident light in the area where the first incoupling diffractive optical element is located, where the actual information of the incident light includes: actual light intensity information;

the third judgment module is connected with the detection modules and is used for comparing the actual information of the incident light collected by each detection module with the range of the corresponding reference information, and when the actual information of the incident light collected by a certain detection module is not in the range of the corresponding reference information and the detection module is a normal detection module, the area corresponding to the detection module is judged to be an abnormal area;

the counting module is used for counting the abnormal areas;

The beneficial effects of the above technical scheme are: the method comprises the steps that a plurality of detection modules are arranged on a light incident surface of a first incoupling diffraction optical element at intervals, the detection modules are used for collecting actual information of incident light in an area where the detection modules are located, meanwhile, an area formed by the detection modules comprises a standard incident area, and whether the incident range state of the light incident surface of the first incoupling diffraction optical element is normal or not can be judged according to matching of the actual incident area and the standard incident area; when the actual information of the incident light collected by a certain detection module is not in the range of the corresponding reference information and the detection module is a normal detection module, the area corresponding to the detection module is judged to be an abnormal area, namely, the detection result abnormity of the detection module caused by the self abnormity of the detection module is eliminated, so that the finally determined abnormal detection area is more accurate, and meanwhile, the collimation system is judged to be a normal collimation system or an abnormal collimation system, so that the influence state of the collimation system on the state of the incident range and the state of the certain detection area can be judged; finally, based on the number and the position of the abnormal regions, the judgment result of the second judgment module and the matching result of the matching unit, an adjustment strategy for the detection module, the collimation system and the display source is formulated, and the detection module, the collimation system and the display source can be reliably adjusted based on the multiple parameters (the number and the position of the abnormal regions, the judgment result of the second judgment module and the matching result of the matching unit).

In one embodiment, the display source comprises a micro display screen 16, the micro display screen 16 is mounted in a display screen mounting groove 19 of a binocular augmented reality near-to-eye display device main body 17 through two symmetrically arranged display screen mounting components 18, a transparent baffle plate 20 is arranged in the display screen mounting groove 19, a plurality of dustproof air vents 21 are arranged on the binocular augmented reality near-to-eye display device main body 17, and the display screen mounting groove 19 is communicated with the external environment through the dustproof air vents 21;

the display screen mounting assembly 18 includes:

the main shaft 180 is rotatably connected in the binocular augmented reality near-to-eye display device main body 17, one end of the main shaft 180 is located in the first installation cavity 1800, the other end of the main shaft is located in the containing cavity 1801, a connecting thread is arranged at one end of the main shaft located in the containing cavity 1801, a driving motor 1802 is arranged on the main shaft 180, and the driving motor 1802 is used for driving the main shaft 180 to rotate;

the threaded connecting block 1803 is in threaded connection with one end, located in the containing cavity 1801, of the main shaft 180, a clamping groove 1804 is formed in the threaded connecting block 1803, and the micro display screen 16 is inserted into the clamping groove 1804;

a first gear 1805, said first gear 1805 being keyed on the main shaft 180;

the binocular augmented reality near-to-eye display device comprises a first rotating shaft 1806 and a second gear 1807, wherein the first rotating shaft 1806 is rotatably connected in a binocular augmented reality near-to-eye display device main body 17, one end of the first rotating shaft 1806 is located in a first installation cavity 1800, the other end of the first rotating shaft is located in a display screen installation groove 19, the second gear 1807 is connected to the first rotating shaft 1806 in a sliding key mode, a first driving piece is arranged on the second gear 1807 and used for driving the second gear 1807 to slide along the first rotating shaft 1806, and the second gear 1807 is used for being meshed with the first gear 1805;

the mounting device comprises a mounting groove body 1808, the mounting groove body 1808 is fixedly connected in a display screen mounting groove 19, a lead screw 1809 is rotationally connected in the mounting groove body 1808, a third gear 181 is connected to the lead screw 1809 through a key, a fourth gear 1810 is connected to one end of the first rotating shaft 1806 in the mounting groove body 1808 through a key, and the third gear 181 is meshed with the fourth gear 1810;

the lead screw nut mounting block 1811 is in threaded connection with the lead screw 1809, a rack 1813 is connected in the lead screw nut mounting block 1811 in a sliding manner through a guide rod 1812, a cleaning brush rod 1814 and a swinging gear 1815 are connected in the lead screw nut mounting block 1811 in a rotating manner, the cleaning brush rod 1814 and the swinging gear 1815 are coaxially connected in the lead screw nut mounting block 1811 in a rotating manner, the swinging gear 1815 is mutually meshed with the rack 1813, a second driving piece is arranged on the rack 1813, and the second driving piece is used for driving the rack 1813 to slide along the guide rod 1812;

a first bevel gear 1816, said first bevel gear 1816 being keyed to said main shaft 180;

the second rotating shaft 1817 is rotatably connected in the binocular augmented reality near-eye display device main body 17, a second bevel gear 1818 is connected to one end of the second rotating shaft 1817 located in the first installation cavity 1800 in a sliding manner, a third driving part is arranged on the second bevel gear 1818, the third driving part is used for driving the second bevel gear 1818 to slide along the second rotating shaft 1817, the second bevel gear 1818 is used for being mutually meshed with the first bevel gear 1816, and a third bevel gear 182 is connected to one end of the second rotating shaft 1817 located in the second installation cavity 1819;

a third rotating shaft 1820, the third rotating shaft 1820 is rotatably connected in the binocular augmented reality near-to-eye display device main body 17, one end of the third rotating shaft 1820 located in the second installation cavity 1819 is connected with a fourth bevel gear 1821, the fourth bevel gear 1821 is meshed with the third bevel gear 182, and one end of the third rotating shaft 1820 located in the air outlet cavity is fixedly connected with a fan 1822;

the heater 1823 is fixedly connected to the inner wall of the air outlet cavity, and the dust screen 1824 is fixedly connected to the air outlet cavity;

the liquid storage cavity 1825 is arranged in the binocular augmented reality near-to-eye display device main body 17, and cleaning liquid is arranged in the liquid storage cavity 1825;

outlet pipe 1826, outlet pipe 1826 fixed connection be in on the threaded connection piece 1803, install miniature suction pump 1827 on the outlet pipe 1826, miniature suction pump 1827's the end of intaking communicates with each other with stock solution chamber 1825.

The working principle and the beneficial effects of the embodiment are as follows: when the micro display screen 16 is installed, the driving motor 1802 drives the main shaft 180 to rotate, the main shaft 180 rotates to drive the two threaded connecting blocks 1803 to approach each other under the action of threads, so that the micro display screen 16 is clamped in the clamping groove 1804, and impurity dust in an external environment of the micro display screen 16 can enter the binocular augmented reality near-to-eye display device main body 17 in a long-term use process, so that an impurity dust layer is attached to the surface of the micro display screen 16, and the micro display screen 16 needs to be cleaned;

when the micro display screen 16 is cleaned, the first driving member drives the second gear 1807 to slide along the first rotating shaft 1806, so that the second gear 1807 and the first gear 1805 are engaged with each other, the driving motor 1802 drives the main shaft 180 to rotate, the main shaft 180 rotates to drive the first gear 1805 to rotate, the first gear 1805 rotates to drive the second gear 1807 to rotate, the second gear 1807 rotates to drive the first rotating shaft 1806 to rotate, the first rotating shaft 1806 rotates to drive the fourth gear 1810 to rotate, the fourth gear 1810 rotates to drive the third gear 181 to rotate, the third gear 181 rotates to drive the lead screw 1809 to rotate, the lead screw 1809 rotates to drive the lead screw nut mounting block 1811 to move along the lead screw 1809, during the process that the lead screw nut mounting block 1811 moves along the lead screw 1809, the second driving member drives the rack 1813 to slide along the guide rod 1812, the rack 1813 moves to drive the swinging gear 1815 to rotate, the swinging gear 1815 rotates to drive the cleaning rod 1814 to swing, the cleaning rod 1814 swings, meanwhile, the cleaning liquid storage tank 1824 is pumped into the cleaning micro display screen 1826, and the cleaning liquid storage tank 1826 is sprayed and sprayed with cleaning liquid, and the cleaning liquid storage tank 1824;

after the micro display screen 16 is cleaned, the third driving member drives the second bevel gear 1818 to slide along the second rotating shaft 1817, so that the second bevel gear 1818 is engaged with the first bevel gear 1816, the driving motor 1802 drives the main shaft 180 to rotate, the main shaft 180 drives the first bevel gear 1816 to rotate, the first bevel gear 1816 drives the second bevel gear 1818 to rotate, the second bevel gear 1818 drives the second rotating shaft 1817 to rotate, the second rotating shaft 1817 rotates the third bevel gear 182 to rotate, the third bevel gear 182 rotates the fourth bevel gear 1821 to rotate, the fourth bevel gear 1821 rotates the third rotating shaft 1820 to rotate, the third rotating shaft 1820 rotates the fan 1822, the fan 1822 rotates while the heater 1823 operates to blow hot air into the display screen installation slot 19, so as to accelerate the flow of air in the display screen installation slot 19, so that the cleaning liquid on the micro display screen 16 is quickly evaporated into the external environment through the dustproof vent 21, and when the micro display screen 16 generates fog due to moisture, the cleaning liquid can be dried by using the fan 2, thereby ensuring the output of the micro display screen 16 and the output effect.

In one embodiment, further comprising:

a second light intensity sensor disposed on the right-eye coupling-out diffractive optical element for detecting light intensity of grating stripes of the right-eye coupling-out diffractive optical element;

the controller, the alarm, the controller with first light intensity sensor the second light intensity sensor first wavelength sensor the second wavelength sensor the timer is connected with the alarm electricity, the controller is based on first light intensity sensor the second light intensity sensor first wavelength sensor the timer with second wavelength sensor control the alarm is reported to the police, including following step:

wherein α is an actual working state coefficient of the binocular augmented reality near-eye display device, Δ is a log-average grating contrast of the left-eye coupled-out diffractive optical element and the right-eye coupled-out diffractive optical element, and d ₁ Thickness of the diffractive optical element for left eye coupling out, d ₂ Thickness of the diffractive optical element for the right eye, μ being the refractive index of the waveguide plate, λ ₁ Is a detected value of the first wavelength sensor, λ ₂ Is a detected value of the second wavelength sensor, λ ₀ Wavelength of light in air, gamma ₁ Coupling strength of the grating of the diffractive optical element, gamma, for the left eye ₂ Coupling strength of the grating of the diffractive optical element, gamma, for the right eye ₀ Coupling intensity of a preset grating of the coupling-in diffractive optical element is epsilon, the Bragg mismatch amount of the binocular augmented reality near-to-eye display device is epsilon, T is a detection value of the timer, and TH is the service life of the binocular augmented reality near-to-eye display device;

step three: the controller is compared binocular augmented reality near-to-eye display device's actual operating condition coefficient with binocular augmented reality near-to-eye display device's predetermined operating condition coefficient scope, if binocular augmented reality near-to-eye display device's actual operating condition coefficient is not in binocular augmented reality near-to-eye display device's predetermined operating condition coefficient scope, then the alarm reports to the police.

The working principle and the beneficial effects of the embodiment are as follows: the condition that coupling efficiency is not good or natural loss can appear in binocular augmented reality near-to-eye display device long-term use in-process to lead to binocular augmented reality near-to-eye display device working state not good, the design of binocular augmented reality near-to-eye display device monitoring system is used for monitoring binocular augmented reality near-to-eye display device's operating condition (including binocular augmented reality near-to-eye display device natural loss state and binocular augmented reality near-to-eye display device's grating coupling efficiency), and the suggestion of reporting to the police when binocular augmented reality near-to-eye display device working state is not good has guaranteed binocular augmented reality near-to-eye display deviceThe eye display device can be maintained in time when working abnormally, and the actual working state coefficient of the binocular augmented reality near-eye display device is calculated, wherein

For the grating coupling efficiency of the binocular augmented reality near-to-eye display device, introduce

The natural loss of the binocular augmented reality near-to-eye display device is considered, the Bragg mismatch amount epsilon of the binocular augmented reality near-to-eye display device is introduced, the grating coupling efficiency of the binocular augmented reality near-to-eye display device is smaller when epsilon is larger, the logarithmic average grating contrast ratio delta of the left eye coupling-out diffraction optical element and the right eye coupling-out diffraction optical element is introduced, the grating structure formed by the binocular augmented reality near-to-eye display device is clearer when delta is larger, and the self parameter d of the left eye coupling-out diffraction optical element and the right eye coupling-out diffraction optical element is considered at the same time ₁ And d ₂ And the influence of the refractive index mu of the waveguide plate on the calculation result enables the calculation result to be more accurate, so that the monitoring sensitivity of the binocular augmented reality near-to-eye display device monitoring system is improved.

Based on the same concept, an embodiment of the present disclosure further provides an augmented reality display apparatus, including the augmented reality near-eye display device according to any one of the above technical solutions. The augmented reality display device may be an AR glasses or an AR helmet, or the like.

In summary, the invention adopts the polarization volume holographic grating PVG as the optical coupling device to solve the problem of poor FOV and color performance of the waveguide imaging system caused by too narrow response bandwidth of the volume holographic grating for a long time. The PVG forms a periodic structure with three-dimensional anisotropy by utilizing a polarization holographic optical orientation technology and a liquid crystal self-assembly characteristic, so that the PVG has a polarization-related phase modulation characteristic and a high-efficiency Bragg grating large-angle light deflection capability on a diffraction characteristic. And the light out-coupling device adopts a non-polarized light splitting film array. The non-polarization light splitting film array can directly couple out circularly polarized light through the optimized design of the film system, and the uniformity of the brightness of the light entering the eyes finally can be ensured through the set light splitting ratio. Due to the use of the non-polarization light splitting film array, the design of the light machine collimation system in the waveguide display system can be free from the constraint of the traditional light path design, and a full-lens type light path design is adopted. Meanwhile, the light is coupled in twice to effectively reuse the lost 0-level diffraction light, so that the light efficiency is improved, pupil expansion can be realized, the continuity and integrity of the final image are ensured, and the light and dark stripes of the displayed image are improved.

It is further understood that the use of "a plurality" in this disclosure means two or more, and other terms are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A binocular augmented reality near-to-eye display device, comprising: a display source, a collimating system, an incoupling diffractive optical element, a waveguide plate and an outcoupling optical element;

2. The binocular augmented reality near-eye display device of claim 1, wherein the first in-coupling diffractive optical element and the second in-coupling diffractive optical element are the same.

3. The binocular augmented reality near-to-eye display device of claim 1, wherein the first polarizer holographic grating comprises a left-handed polarizer holographic grating and the second polarizer holographic grating comprises a right-handed polarizer holographic grating.

4. The binocular augmented reality near-eye display device of claim 1, wherein the first and second arrays of non-polarizing dichroic films are identical but symmetrically arranged;

the first non-polarization light splitting film array and the second non-polarization light splitting film array respectively comprise a plurality of non-polarization light splitting film array substrates, and the plurality of non-polarization light splitting film array substrates are arranged in parallel and in an inclined mode;

the plurality of the non-polarization light splitting film array substrates are arranged in parallel at equal intervals, the interval between any two non-polarization light splitting film array substrates is a preset interval, and the inclination angle of the non-polarization light splitting film array substrates is a preset angle.

5. The binocular augmented reality near-to-eye display device of claim 1, wherein the collimating system comprises a first lens, a second lens, a third lens and a fourth lens coaxially arranged in sequence from an object plane to an image plane, wherein the first lens is a plano-convex lens, the second lens and the third lens are meniscus lenses, and the fourth lens is a plano-convex lens.

6. The binocular augmented reality near-to-eye display device of claim 5, wherein the first surface of the first lens is planar, the second surface of the first lens is convex and spherical, the first surfaces of the second and third lenses are both concave and spherical, the second surface is convex and spherical, the first surface of the fourth lens is planar, the second surface is convex and aspherical;

the radius of curvature of the convex surface of the second lens is the same as the radius of curvature of the concave surface of the first surface of the third lens, the signs are opposite, and the second lens and the third lens are mutually cemented to form an integral cemented lens, and the radius of curvature of the convex surface of the second surface of the fourth lens is larger than the radius of curvature of the convex surface of the second surface of the first lens.

7. The binocular augmented reality near-to-eye display device of claim 1,

the display source comprises a micro display screen, the micro display screen is installed in a display screen installation groove of a binocular augmented reality near-to-eye display device main body through two symmetrically arranged display screen installation components, a transparent baffle is arranged in the display screen installation groove, a plurality of dustproof air holes are formed in the binocular augmented reality near-to-eye display device main body, and the display screen installation groove is communicated with the external environment through the dustproof air holes;

the display screen mounting assembly includes:

the first gear is connected to the main shaft in a keyed mode;

the mounting groove body is fixedly connected in a display screen mounting groove, a lead screw is rotationally connected in the mounting groove body, a third gear is connected to the lead screw in a key manner, a fourth gear is connected to one end of the first rotating shaft in the mounting groove in a key manner, and the third gear is meshed with the fourth gear;

the first bevel gear is connected to the main shaft in a key mode;

8. The binocular augmented reality near-eye display device of claim 1, further comprising:

the method comprises the following steps: calculating a log-average grating contrast of the left-eye and right-eye couple-out diffractive optical elements based on a first light intensity sensor, a second light intensity sensor, and equation (1):

wherein α is an actual working state coefficient of the binocular augmented reality near-eye display device, Δ is a log-average grating contrast of the left-eye coupled-out diffractive optical element and the right-eye coupled-out diffractive optical element, and d ₁ Thickness of the diffractive optical element for left eye coupling out, d ₂ Thickness of the diffractive optical element for the right eye, μ being the refractive index of the waveguide plate, λ ₁ Is a value detected by the first wavelength sensor, λ ₂ Is a detected value of the second wavelength sensor, λ ₀ Wavelength of light in air, gamma ₁ Coupling strength of the grating of the diffractive optical element, gamma, for the left eye ₂ Coupling strength of the grating of the diffractive optical element, gamma, for the right eye ₂ Coupling intensity of a preset grating of the coupling-in diffractive optical element is epsilon, the Bragg mismatch amount of the binocular augmented reality near-to-eye display device is epsilon, T is a detection value of the timer, and TH is the service life of the binocular augmented reality near-to-eye display device;

9. The binocular augmented reality near-eye display device of claim 1, further comprising a detection system, the detection system comprising:

the counting module is used for counting the abnormal areas;

10. An augmented reality display device, comprising:

the binocular augmented reality near-eye display device of any one of claims 1-9.