CN109917547A - Full-color waveguide based on Color Polarization body grating couples nearly eye and shows structure, preparation method and AR wearable device - Google Patents

Full-color waveguide based on Color Polarization body grating couples nearly eye and shows structure, preparation method and AR wearable device Download PDF

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Publication number
CN109917547A
CN109917547A CN201811286578.2A CN201811286578A CN109917547A CN 109917547 A CN109917547 A CN 109917547A CN 201811286578 A CN201811286578 A CN 201811286578A CN 109917547 A CN109917547 A CN 109917547A
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color
green
waveguide
blue
coupling device
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张宇宁
翁一士
崔静怡
刘奡
沈忠文
李晓华
王保平
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Southeast University
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Southeast University
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Priority to CN201811286578.2A priority Critical patent/CN109917547A/en
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Priority to PCT/CN2019/101983 priority patent/WO2020088055A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells

Abstract

The full-color waveguide based on Color Polarization body grating that the invention discloses a kind of couples nearly eye and shows structure, preparation method and AR wearable device.Coupling device present invention uses Color Polarization volume holographic grating as waveguide, compared to traditional holographic coupling grating, the novel grating has high-diffraction efficiency using the self assembly effect and anisotropy of liquid crystal, big angle of diffraction, it can work in wider wavelength and angular bandwidth simultaneously, in conjunction with disclosed Multilayer waveguide, the present invention is applied to nearly eye display application, it can be achieved that big field angle, the high grade of transparency, efficient colo r image transmission.

Description

Full-color waveguide based on Color Polarization body grating couples nearly eye and shows structure, preparation side Method and AR wearable device
Technical field
The full-color waveguide that the present invention relates to a kind of based on Color Polarization body grating couple nearly eye show structure, preparation method and AR wearable device.
Background technique
The near-eye display system designed based on the slab guide with coupling element has very big in the past more than ten years Development, be widely applied to military and commercial field.In AR equipment, above-mentioned waveguiding structure must satisfy light-weight, body The small, high grade of transparency of product and the wide feature of emergent pupil.One of basic module as coupled waveguide near-eye display system, coupling member Part can determine the important parameters such as field angle (FOV), coupling efficiency, colour rendering.
For further lightization waveguiding structure, diffractive-optical element (DOEs) has been widely studied and in the nearly eye of waveguide It is used as coupling element in display system.In this more diffraction elements, optical diffraction gratings are most common.When being used in wave When leading in manifold type near-eye display system, the incident beam from micro-display can be coupled in waveguide by diffraction grating.Spread out Penetrating grating also has angular selectivity and wavelength selectivity while with the big angle of diffraction, and this guarantees meeting in complete Light beam can be propagated expeditiously in the waveguide when conditioned reflex.
In view of the diversity of optical diffraction element, holographic body grating (HVG) has the advantages that uniqueness, therefore is widely used as Coupling device in waveguide.General holography body grating can be by hologram recording material (such as photopolymer, bichromate Gelatin etc.) record interference pattern be made.When the light beam for meeting Bragg condition is irradiated on HVG, high diffraction effect can occur The single diffraction order of rate, and angle of diffraction is very big, and this is the important feature of HVG.Simultaneously as it is with narrow bandwidth and stringent Angular selectivity, HVG have high-permeability to environment light.But angular bandwidth and wavelength bandwidth are very short to will limit field angle FOV Size and when be used waveguide coupling display system in when, also will limit the realization of full-color transmission.
The difference of birefringence can determine the angle and wavelength bandwidth of body grating.Traditional dichromated gelatin material Birefringent material can reach 0.15.But nowadays it leads to the high susceptibility of environment and its complicated preparation process The birefringence difference of most of photopolymers for being used as recording medium only has 0.035.So small birefringence difference Cause angular bandwidth and wavelength bandwidth very narrow, so as to cause field angle very little.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of full-color waveguide coupling for being based on Color Polarization body grating (CPVG) The preparation method of near-eye display system is closed, diffraction efficiency present in existing method is low, field angle is small, is unfavorable for for solving The problems such as realizing full-color transmission.And the deviation characteristic of grating make at least 50% unpolarized ambient light be directed through grating and Diffraction does not occur.
Technical solution: to solve the above problems, the invention adopts the following technical scheme:
A kind of nearly eye display structure of full-color waveguide coupling based on Color Polarization body grating, uses with Color Polarization body grating Realize that full-color nearly eye is shown as the double-deck waveguiding structure of coupling device, wherein one layer be used to propagate it is blue, green beam Blue, green polarization body grating has been used in blue, green waveguiding structure as coupling device, and to realize, transmission is blue in the waveguide Color and green beam；Another layer be used to propagate red beam red waveguiding structure in used red polarization body grating as Coupling device transmits red beam to realize in the waveguide.
In blue, green waveguiding structure enter coupling device and coupling device is blue, green PVG out, and blue, green wave In guide structure enter coupling device and coupling device is located at the mirror surface symmetric position of planar waveguiding structure out；Correspondingly, red wave In guide structure enter coupling device and coupling device is red PVG out, and second enter coupling device in red waveguiding structure Coupling device also is located at the mirror surface symmetric position of planar waveguiding structure out.
Blue, the green waveguiding structure includes blue ducting layer and two layers of ducting layer of green.
There is air layers between two ducting layers after every two ducting layer is superimposed.
The horizontal cycle length value of blue ducting layer is identical with green ducting layer horizontal cycle length value, meets Prague Diffraction formula:
In formula (3), neffRepresent the equivalent refractive index of birefringent material used in grating；ΛxRepresent grating in the x direction Horizontal cycle length；Represent the inclination angle in ducting layer with periodic refractive index plane；λBRepresent the cloth in vacuum Glug wavelength.
It is aobvious that the present invention further discloses the nearly eye of the coupling of the full-color waveguide described in one kind based on Color Polarization body grating Show the preparation method of structure, including the following steps:
Spin coating, heating are carried out on clean glass waveguide surface Step 1: light orientation material is dissolved in after corresponding solvent Film is formed after a period of time；
Step 2: carry out interference exposure on the light orientation material film that two beam polarised lights are formed in step 1, one is gone forward side by side Step forms light redirecting layer；
Step 3: in the oriented layer that the solution containing liquid crystal polymer and chiral material is formed in step 2, then Glass is placed on spin coater and is stopped after a certain period of time with certain rotation speed rotation；
Step 4: using 5J/cm2Ultraviolet light ultra-violet curing is carried out in nitrogen environment；
Grating is formed with guarantee until film thickness reaches 100nm to 1 μm Step 5: repeating step 3 and step 4, this Outside, for the spin coating first of blue, green waveguiding structure and solidify green PVG thickness and reach 100nm~1 μm, later in green PVG The ducting layer of direct spin coating and fixed blue on layer.
Exposure environment in step 2 need to meet temperature be 20 DEG C~30 DEG C between, relative humidity be maintained at 38 or less.
Energy of lasers control is in 6J/cm used in exposing in step 22~10J/cm2。
The present invention also further discloses a kind of AR wearable device, using described based on the complete of Color Polarization body grating Color waveguide couples nearly eye and shows structure.
The utility model has the advantages that
The first, the colored volume holographic grating that coupling is played in the present invention can be by the light of bluish-green wave band and red band It is respectively coupled to realize the display system based on full-color coupled waveguide in two waveguides.
The second, the present invention forms the structure of Bragg grating and used liquid crystal material has big birefringence Difference △ n, therefore very high diffraction efficiency of grating can be realized according to the coupled-mode theory present invention.
The liquid crystal material that third, the present invention use has biggish birefringence difference, according to coupled-mode theory coupling It closes grating incident angle bandwidth to become larger, can prepare that the AR with big field angle (can achieve 35 °) is wearable to be set using this point It is standby.
Detailed description of the invention
Fig. 1 is the CPVG structural schematic diagram in the present invention as coupling device；
Wherein, Fig. 1 (a) illustrates the blue-green body grating structure for being used to diffraction blue and green, wherein ΛbgxIt represents Blue ducting layer and this two layers horizontal cycle length value of green ducting layer；ΛbyAnd ΛgyRespectively represent blue ducting layer and green The vertical cycle length value of color ducting layer；Vector KbAnd KgRespectively represent the cloth of body grating in blue ducting layer and green ducting layer Glug vector；WithRespectively represent the inclination with periodic refractive index plane in blue ducting layer and green ducting layer Angle.
Fig. 1 (b) illustrates the PVG structure that can make feux rouges that Bragg diffraction occur, wherein ΛrxRepresent red ducting layer Horizontal cycle length value；ΛryRepresent vertical cycle length value；Vector KrRepresent the Bradley lattice vector of body grating in red ducting layer Amount；Represent the inclination angle with periodic refractive index plane in red ducting layer；α is represented between liquid crystal molecule optical axis and z-axis Angle.
Fig. 2 is the schematic diagram of the double-deck waveguiding structure set forth in the present invention；
Wherein, 1, micro-display；2, the retina of observer；3, human lens；4,Collimator；5, blue-green ducting layer Air layer between red ducting layer；6, blue-green ducting layer；7, red ducting layer；8, the coupling that enters of green ducting layer fills It sets；9, the coupling device out of blue-green ducting layer；10, red ducting layer enters coupling device；11, the coupling out of red ducting layer Device；
Fig. 3 is the schematic diagram of three layers of waveguiding structure set forth in the present invention；
Wherein, 20, blue ducting layer enters coupling device；30, green ducting layer enters coupling device；40, blue waveguide Layer goes out coupling device；50, the coupling device out of green ducting layer；60, blue ducting layer；70, green ducting layer；
Fig. 4 is the curve graph that the angle of diffraction of the invention changes with incidence angle variation；
Fig. 5 is flow chart of the invention；
Fig. 6 is exposure light path schematic diagram used in the present invention；
Wherein, 100, linearly polarized laser device；200, half-wave plate；300, polarising beam splitter PBS；(400,900), four/ One wave plate；(500,800), extender lens；(600,700), plane mirror；1000, print to be exposed；α represents two beam polarised lights Between angle.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
The structure of the used CPVG as coupling device is as shown in Figure 1 in the present invention.Volume holographic grating as shown in Figure 1 PVG has two-dimensionally periodic structure, wherein
At x-z-plane (horizontal plane), the angle α between liquid crystal molecule optical axis and z-axis can in the x-direction, and both horizontal direction was sent out Raw cyclically-varying, cycle length are denoted as Λx。
On the y-z plane, liquid crystal material (or broadly, birefringent material) was both presented in vertical direction in the direction y Period spin structure out, period are denoted as Λy。
Such two-dimensionally periodic structure can generate a series of inclined with periodic refractive index plane, inclination angleIt can be calculated by formula (1):
For simplifying the analysis and without loss of generality, it is assumed that the inclination angle of reflective PVG meetsAnd α can be by Formula (2) calculates:
If birefringent material layer is sufficiently thick, Bragg diffraction can be established.In fact, vertical incidence light spreads out Light is penetrated with high-diffraction efficiency, represented by Bragg diffraction is by formula (3):
λ in formula (3)BRepresent the bragg wavelength in vacuum, neffThe equivalent refractive index for representing birefringent medium, by formula (4) It calculates:
Two kinds of CPVG structures demonstrated in Figure 1 respectively represent (a) and are used to the indigo plant of diffraction blue and green, green body light Grid (cyan PVG).Cyan PVG is divided into blue and two layers of green, this two layers horizontal cycle length is identical, in Fig. 1 (a) Λ is referred to as inbgx, value is by above-mentioned formula (3) calculating:
In formula (3), neffRepresent the equivalent refractive index of birefringent material used in grating；ΛxRepresent grating in the x direction Horizontal cycle length；Represent the inclination angle in ducting layer with periodic refractive index plane；λBRepresent the cloth in vacuum Glug wavelength.
As wavelength value λBFor 457nm (blue),When for refractive index plane camber angle in blue ducting layer, ΛxFor blue Ducting layer horizontal cycle length value；As wavelength value λBFor 532nm (green),For the refractive index plane inclination in green ducting layer When angle, ΛxFor green ducting layer horizontal cycle length value.By the level of the blue-green ducting layer in the structure that the present invention is mentioned Cycle length numerical value is identical, therefore is denoted as Λbgx。
Due to bluish-green two layers horizontal cycle length value having the same, so blue, green two layers of ducting layer meets identical light Grid dispersion equation (5):
In formula (5), θ0Represent the angle of diffraction (angle of propagation of light beam in the waveguide), nglassRepresent the refractive index of glass waveguide Value, λ represent the wavelength of light beam, θiAerial incidence angle is represented, m represents diffraction time (m=1 for body grating), ΛxRepresent the horizontal cycle length of grating in the x direction.For blue, green ducting layer, ΛxAs Λbgx。
Blue, green two layers the difference is that cycle length on the direction y is different, i.e. Λ in Fig. 1 (a)byAnd ΛgyNo Together, by formula (1) and (3) it is found which dictates that the difference of Prague central wavelength when vertical incidence.
Required for CPVG only needs a polarization interference exposure that can generate on light orientation material during the preparation process Horizontal cycle length Λx, successively spin coating has different Λ lateryChiral helical material.
Fig. 1 (b) illustrates the PVG structure that can make feux rouges that Bragg diffraction occur, it has different with Lan, green CPVG Horizontal cycle length, i.e. ΛrxNot equal to Λbgx。
Table 1 lists one group of example parameter.As the citing in specific implementation, table 1 lists the different centers of one group of correspondence The relevant parameter of the CPVG of wavelength (457nm, 532nm, 630nm).Design parameter value needs under actual conditions are set according to required Meter changes.
Fig. 2 illustrates overall structure of the invention, and system includes the blue-green ducting layer 6 for propagating blue green The red red ducting layer 7 (Waveguide (R)) of (Waveguide (B+G)) and a propagation.
Green ducting layer in blue-green ducting layer 6 enter coupling device 8 and blue-green ducting layer to go out coupling device 9 equal For blue-green PVG, and green ducting layer enter coupling device 8 and the coupling device 9 that goes out of blue-green ducting layer is located at plane wave The mirror surface symmetric position of guide structure.Correspondingly, the red ducting layer in red ducting layer 7 enters coupling device 10 and red waveguide The coupling device 11 that goes out of layer is red PVG, and enter coupling device 10 and the red ducting layer of red ducting layer go out to couple Device 11 also is located at the mirror surface symmetric position of planar waveguiding structure.
More clearly, Fig. 2 illustrates biography of the light beam of the central wavelength section from micro-display 1 in the double-deck waveguiding structure It broadcasts.It, will be by blue-green wave by the white light comprising three kinds of wave bands of RGB that micro-display 1 issues after the collimation of collimator 4 The green ducting layer of conducting shell enter coupling device 8 and the coupling device 10 that enters of red ducting layer is vertically injected in waveguide.
Then, enter coupling device will be greater than alinternal reflection angle different angle by diffracting incident light into waveguide.This Two waveguides that can propagate different-waveband light beam have different PVG.
It works positioned at the indigo plant on top, the CPVG of green waveguide to blue and green, the angle of diffraction can use formula (5) and obtain It arrives.
PVG positioned at the red waveguide of bottom end only works to red, and similarly, the angle of diffraction also can use formula (5) It obtains.
When the light beam of propagation is reached as the PVG for going out coupling, when coupling PVG can be to reach with incidence wave into coupling out Beam diffraction is gone out waveguide by angle.
By the collimation of human lens 3, the retina 2 of observer can receive in place one it is colored Pixel image.In fact, pixel is imaged at infinity and is received by human eye.
In addition, dispersion phenomenon can be cancelled due to entering coupling and going out the symmetry of coupling PVG in the horizontal direction.? That is colored ghost images can be eliminated in inside, this is one important for the full-color display for guaranteeing picture quality The characteristics of.Moreover, the propagation for the light beam propagated in different waveguide is incoherent, and due to existing between two ducting layers Air layer 5, therefore the crosstalk between the grating of different waveguide is negligible.On the other hand, the company of emergent pupil Continuous property is also a critical issue for the display system based on waveguide, it will affect when different location observes image The uniformity of color and brightness.We study in pervious work and have recorded the related fact.It is suitable by selecting The waveguide of thickness, the method propagated step-length and adjust entrance pupil size, the problem can be solved efficiently.
Using the glass of high refractive index with a thickness of 1mm as waveguide, and the propagation light beam of three kinds of colors (red, green, blue) Central wavelength be respectively 630nm, 532nm, 457nm.
In order to enable light beam to propagate along waveguide, the smallest angle of diffraction is calculated by formula (6):
θmin=arcsin (1/n), (6)
N represents the refractive index value of waveguide material used in formula (6).
Maximum diffraction angle is calculated by formula (7):
θmax=arctan (W/2t), (7)
W represents collimator sky diameter and (represents the thickness of waveguide (every layer in the present invention for 10mm), t in the present invention in formula (7) Duct thickness is 1mm).
Fig. 4 illustrates angle of diffraction distribution curve under the conditions of different wave length with different incidence angles.
The FOV that can be realized as shown in Figure 4 is about 35.7 ° (- 13.3 °~22.4 °), and the field angle of this size is full The foot demand of the near-eye display system based on waveguide of current main-stream.
Fig. 5 is specific preparation flow figure:
It is carried out Step 1: light orientation material is dissolved in after corresponding solvent on the clean glass waveguide surface (n=1.85) Spin coating.
Azo dyes class such as SD1, BY etc. may be selected as example and be used as light orientation material, DMF is as solvent.Spin coater with Stop after certain revolving speed spin for some time, waveguide is heated to 30 minutes formation films in 120 DEG C of thermal station later.
Step 2: carry out interference exposure on the light orientation material film that two beam polarised lights are formed in step 1, one is gone forward side by side Step forms light redirecting layer, and exposure device is as shown in Figure 6:
The light beam issued by linearly polarized laser device 100 after half-wave plate 200 by 300 points of polarising beam splitter (PBS) At the light beam that two beams are mutually orthogonal.Two beam polarised lights are changed into dextrorotation circle again by two quarter-wave plates (QWP) respectively Polarisation and left-handed rotatory polarization.
Half-wave plate 200 is used to the light intensity of adjustment two-way light to guarantee that two-way light intensity is identical.
Two-way coherent light is reflected by plane mirror certain angle, finally respectively after space filtering and extender lens The opposite rotatory polarization of the inclined characteristic of this two beam circle will be superimposed with the angle of α and form interference pattern in the light redirecting layer of sample 1000 Sample.
As example of the invention, for blue, green and red PVG, if exposure angle be separately arranged as 76 ° and 60 °, this will make the cycle length of its horizontal direction be respectively 371.5nm and 457nm.
Exposure environment must satisfy the condition of certain temperature and humidity.Furthermore energy of lasers used in exposure process Also it must satisfy certain condition.As an example, energy of lasers used in the present invention is in 8J/cm2Left and right.
Step 3: the helical structure in Fig. 1 on the direction y is generated in the present invention using liquid crystal polymer and chiral material, And use photoinitiator and coordinative solvent.Irgacure651 can be used as photoinitiator, using toluene as molten as example Agent.
As an example, the solution containing liquid crystal polymer and chiral material mentioned in step three used in the present invention Matter liquid proportional is about in the range of 15%~20%.
Spin coater is stopped after a certain period of time with certain rotation speed rotation, vertical cycle length ΛyNeeded for capable of reaching The value wanted.
As an example, can choose, red (the central wavelength 457nm) gone out as given in table 1, green (central wavelength is 532nm), the horizontal cycle length value Λ of blue (central wavelength 630nm) three color ducting layerxWith vertical cycle length value ΛyIt carries out Preparation.
Table 1
In fact, due to the anchoring energy of light redirecting layer and the helically twisted two-dimensionally periodic structure that can be generated of chiral material, Birefringent material molecule is capable of forming helical structure.
Step 4: carrying out ultra-violet curing in nitrogen environment using ultraviolet light, the specific performance number of ultraviolet light is needed according to institute The factors such as the material category used determine.As an example, UV energy used in the present invention meets 1J/cm2~10J/ cm2's
Step 5: repeating step 3 four until film thickness is greater than certain value (as an example, the value is about in the present invention 4.5μm).Further for blue, green PVG spin coating first and the PVG for solidifying green to required thickness, later in green The solution of direct spin coating and fixed blue on PVG layer.
A waveguide can be made by above five steps, repeat above five step later and prepare another color again Waveguide says that two waveguides are just superimposed and the full-color coupled waveguide based on Color Polarization body grating has just been made.
As an example, the rectangle that the bottom surface of present invention substrate of glass used herein above is 25mm × 75mm, with a thickness of 0.05mm, birefringence value 0.18.It is using transparent ultraviolet curable agent that another is identical after spin coating and grating preparation Clean bonding glass be formed by grating surface, final obtained one layer of duct thickness is 1mm.
It also include three layers of waveguiding structure as the present invention based on same working principle.
As shown in figure 3, the indigo plant of single layer, green waveguide are divided into blue ducting layer 60, green 70 two layers of ducting layer.Every layer The step of production of waveguide is also according to described in Fig. 5 is carried out.Later by central wavelength be 457nm blue ducting layer 60 and in The red ducting layer 7 that the red ducting layer 70 of green and central wavelength of a length of 532nm of cardiac wave is 630nm is superimposed i.e. group At three layers of waveguiding structure described in Fig. 3.
Similarly with the double-deck waveguiding structure, the white light beam comprising three kinds of wave bands of RGB from micro-display 1 is passing through Cross after collimator 4 collimates, pass sequentially through blue ducting layer enter coupling device 20, green ducting layer enter coupling device 30 and Red ducting layer enter coupling device 10 after vertically inject in waveguide.Then, entering to couple PVG will be to be greater than alinternal reflection angle Different angle is by diffracting incident light into waveguide.Due to enter coupling device and out coupling device about in waveguide have mirror surface it is symmetrical Property, therefore when the light beam propagated in different waveguide layer is reached as the PVG for going out coupling, out coupling PVG can with incidence wave Beam diffraction is gone out waveguide by angle when reaching into coupling.
40 coupling device that goes out for representing blue ducting layer in Fig. 3,50 represent the coupling device out in green ducting layer, 11 generations Go out coupling device in table red ducting layer, 5 represent the air layer between different waveguide layer.
For light beam by the collimation of human lens 3 after waveguide injection, the retina 2 of observer in place can be with Receive a colored pixel image.
In fact, pixel is imaged at infinity and is received by human eye.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (9)

1. a kind of full-color waveguide based on Color Polarization body grating couples nearly eye and shows structure, it is characterised in that: use with colour Polarization body grating realize that full-color nearly eye show as the double-deck waveguiding structure of coupling device, wherein one layer be used to propagation indigo plant, Use blue, green polarization body grating as coupling device to realize in wave in the indigo plant of green beam, green waveguiding structure Lead middle transmission blue and green beam；Another layer is used to use red polarization in the red waveguiding structure for propagating red beam Body grating transmits red beam as coupling device to realize in the waveguide.
2. the full-color waveguide according to claim 1 based on Color Polarization body grating couples nearly eye and shows structure, feature Be: in blue, green waveguiding structure enter coupling device and coupling device is blue, green PVG out, and blue, green waveguide In structure enter coupling device and coupling device is located at the mirror surface symmetric position of planar waveguiding structure out；Correspondingly, red waveguide In structure enter coupling device and coupling device is red PVG out, and in red waveguiding structure second enter coupling device and Coupling device also is located at the mirror surface symmetric position of planar waveguiding structure out.
3. the full-color waveguide according to claim 1 based on Color Polarization body grating couples nearly eye and shows structure, feature Be: blue, the green waveguiding structure includes blue ducting layer and two layers of ducting layer of green.
4. the full-color waveguide according to claim 3 based on Color Polarization body grating couples nearly eye and shows structure, feature Be: there is air layers between two ducting layers after every two ducting layer is superimposed.
5. the full-color waveguide according to claim 3 based on Color Polarization body grating couples nearly eye and shows structure, feature Be: the horizontal cycle length value of blue ducting layer is identical with green ducting layer horizontal cycle length value, meets Prague and spreads out Penetrate formula:
In formula (3), neffRepresent the equivalent refractive index of birefringent material used in grating；ΛxRepresent the water of grating in the x direction Mean period length；Represent the inclination angle in ducting layer with periodic refractive index plane；λBRepresent Prague in vacuum Wavelength.
6. the full-color waveguide according to claim 1 based on Color Polarization body grating couples the preparation side that nearly eye shows structure Method, it is characterised in that: including the following steps:
Spin coating is carried out on clean glass waveguide surface Step 1: light orientation material is dissolved in after corresponding solvent, heats one section Film is formed after time；
Step 2: carrying out interference exposure on the light orientation material film that two beam polarised lights are formed in step 1, and further shape At light redirecting layer；
Step 3: in the oriented layer that the solution containing liquid crystal polymer and chiral material is formed in step 2, then by glass Glass is placed on spin coater to be stopped after a certain period of time with certain rotation speed rotation；
Step 4: using 5J/cm2Ultraviolet light ultra-violet curing is carried out in nitrogen environment；
Step 5: repeating step 3 and step 4 until film thickness reaches 100nm to 1 μm to guarantee to form grating, in addition, right Yu Lan, the spin coating first of green waveguiding structure and solidify green PVG thickness and reach 100nm~1 μm, later on green PVG layer The ducting layer of direct spin coating and fixed blue.
7. the full-color waveguide according to claim 6 based on Color Polarization body grating couples the preparation side that nearly eye shows structure Method, it is characterised in that: the exposure environment in step 2 need to meet temperature be 20 DEG C~30 DEG C between, relative humidity be maintained at 38 Below.
8. the full-color waveguide according to claim 6 based on Color Polarization body grating couples the preparation side that nearly eye shows structure Method, it is characterised in that: energy of lasers control is in 6J/cm used in exposing in step 22~10J/cm2。
9. a kind of AR wearable device, which is characterized in that use and be based on Color Polarization body as described in any in Claims 1 to 5 The full-color waveguide of grating couples nearly eye and shows structure.
CN201811286578.2A 2018-10-31 2018-10-31 Full-color waveguide based on Color Polarization body grating couples nearly eye and shows structure, preparation method and AR wearable device Pending CN109917547A (en)

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PCT/CN2019/101983 WO2020088055A1 (en) 2018-10-31 2019-08-22 Color polarizer grating-based full-color waveguide coupling near-eye display structure and preparation method therefor, and ar wearable device

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110727116A (en) * 2019-11-13 2020-01-24 东南大学 Two-dimensional pupil expanding method based on polarizer holographic grating
CN110824613A (en) * 2019-11-13 2020-02-21 东南大学 Polarization multiplexing waveguide display device
WO2020088055A1 (en) * 2018-10-31 2020-05-07 东南大学 Color polarizer grating-based full-color waveguide coupling near-eye display structure and preparation method therefor, and ar wearable device
CN111352182A (en) * 2020-04-29 2020-06-30 刘奡 Exposure method of polarizer holographic grating
WO2021060485A1 (en) * 2019-09-27 2021-04-01 富士フイルム株式会社 Method for producing optical element
CN114236971A (en) * 2021-11-30 2022-03-25 歌尔股份有限公司 Exposure system and exposure method of polarization holographic grating
CN114578561A (en) * 2022-01-27 2022-06-03 东南大学 Large-view-field high-brightness holographic waveguide system based on multilayer grating and preparation method thereof
CN114779397A (en) * 2022-04-29 2022-07-22 北京枭龙科技有限公司 Single-layer grating waveguide device for realizing color display and near-to-eye display device
CN115016128A (en) * 2022-08-08 2022-09-06 南京平行视界技术有限公司 Holographic waveguide HUD device based on polarizer
CN115097637A (en) * 2022-08-26 2022-09-23 杭州光粒科技有限公司 Head-up display
WO2022257299A1 (en) * 2021-06-09 2022-12-15 东南大学 Polarization multiplexing diffraction waveguide large-field-of-view angle imaging system and method
US11598919B2 (en) * 2019-10-14 2023-03-07 Meta Platforms Technologies, Llc Artificial reality system having Bragg grating
CN116893462A (en) * 2023-09-08 2023-10-17 北京灵犀微光科技有限公司 Preparation method of polarizer holographic grating and polarizer holographic grating

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8989535B2 (en) * 2012-06-04 2015-03-24 Microsoft Technology Licensing, Llc Multiple waveguide imaging structure
CN104656259A (en) * 2015-02-05 2015-05-27 上海理湃光晶技术有限公司 Conjugated narrow-band tri-phosphor staggered volume holographic grating waveguide near-to-eye optical display device
CN105393161A (en) * 2013-06-28 2016-03-09 微软技术许可有限责任公司 Display efficiency optimization by color filtering
CN105487170A (en) * 2016-01-19 2016-04-13 东南大学 Holographic optical waveguide and holographic optical waveguide display device
CN105807348A (en) * 2016-05-23 2016-07-27 东南大学 Reflection volume holographic grating waveguiding structure
US20170373459A1 (en) * 2016-06-27 2017-12-28 University Of Central Florida Research Foundation, Inc. Volume polarization grating, methods of making, and applications
WO2018096359A2 (en) * 2016-11-28 2018-05-31 Bae Systems Plc Multiple waveguide structure for colour displays
CN108431640A (en) * 2016-02-11 2018-08-21 微软技术许可有限责任公司 The display based on waveguide with antireflection and highly-reflective coating

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2196729A1 (en) * 2008-12-12 2010-06-16 BAE Systems PLC Improvements in or relating to waveguides
WO2019104046A1 (en) * 2017-11-27 2019-05-31 University Of Central Florida Research Optical display system, method, and applications
CN109917547A (en) * 2018-10-31 2019-06-21 东南大学 Full-color waveguide based on Color Polarization body grating couples nearly eye and shows structure, preparation method and AR wearable device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8989535B2 (en) * 2012-06-04 2015-03-24 Microsoft Technology Licensing, Llc Multiple waveguide imaging structure
CN105393161A (en) * 2013-06-28 2016-03-09 微软技术许可有限责任公司 Display efficiency optimization by color filtering
CN104656259A (en) * 2015-02-05 2015-05-27 上海理湃光晶技术有限公司 Conjugated narrow-band tri-phosphor staggered volume holographic grating waveguide near-to-eye optical display device
CN105487170A (en) * 2016-01-19 2016-04-13 东南大学 Holographic optical waveguide and holographic optical waveguide display device
CN108431640A (en) * 2016-02-11 2018-08-21 微软技术许可有限责任公司 The display based on waveguide with antireflection and highly-reflective coating
CN105807348A (en) * 2016-05-23 2016-07-27 东南大学 Reflection volume holographic grating waveguiding structure
US20170373459A1 (en) * 2016-06-27 2017-12-28 University Of Central Florida Research Foundation, Inc. Volume polarization grating, methods of making, and applications
WO2018096359A2 (en) * 2016-11-28 2018-05-31 Bae Systems Plc Multiple waveguide structure for colour displays

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
MUKAWA H，AKUTSU K，ET AL: ""A full-color eyewear display using planar waveguides with reflection volume holograms"", 《JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY》 *
YISHI WENG等: ""Polarization volume grating with high efficiency and large diffraction angle"", 《OPTICS EXPRESS》 *

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JPWO2021060485A1 (en) * 2019-09-27 2021-04-01
JP7398470B2 (en) 2019-09-27 2023-12-14 富士フイルム株式会社 Method for manufacturing optical elements
US11598919B2 (en) * 2019-10-14 2023-03-07 Meta Platforms Technologies, Llc Artificial reality system having Bragg grating
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CN116893462B (en) * 2023-09-08 2023-12-29 北京灵犀微光科技有限公司 Preparation method of polarizer holographic grating and polarizer holographic grating

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