CN107703632A - The light folded waveguide display device of prism-coupled - Google Patents
The light folded waveguide display device of prism-coupled Download PDFInfo
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- CN107703632A CN107703632A CN201710989792.3A CN201710989792A CN107703632A CN 107703632 A CN107703632 A CN 107703632A CN 201710989792 A CN201710989792 A CN 201710989792A CN 107703632 A CN107703632 A CN 107703632A
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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
- G02B27/0101—Head-up displays characterised by optical features
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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
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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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
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0972—Prisms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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Abstract
The invention provides the light folded waveguide display device of prism-coupled, including display light source, collimation lens, couple prism, light wave coupling input module, light wave to fold transmission waveguide, light wave coupling output precision and light wave expansion module.Wherein display light source is used for sending the display light wave of image needed for display, collimation lens is used for collimating the light wave that light source is sent, couple prism is used for the direction of propagation for changing collimated light waves, coupling input module is used to the optical signal coupling in the external world being input in substrate, fold transferring substrate makes it reach outgoing position for carrying out reflection propagation to the light wave of coupling input, couple output precision to be used to the light wave from substrate coupling output, light wave expansion module is then used to expand the light wave of coupling output.The present invention has the characteristics that compact-sized, flexible, visual field is big and in light weight, available for fields such as wearable display, Uniform Illumination and mobile displays.
Description
Technical field
The present invention relates to a kind of display optics, particularly a kind of light for the prism-coupled that can be used for wearing image to show
Folded waveguide display device.
Background technology
Currently a popular various display systems, such as wearing display, FPD, notebook display system generally all use
Optical element transmits and shown required image information.Such as virtual display system is virtually shown picture using optical lens
Show the certain distance in front of human eye, it is achieved thereby that can easily observe week while required electronic information content is browsed
The change of scenery is enclosed, virtual and display is combined.The core optical component of usual such display system mainly has three
It is grouped into：Light wave coupling input optical module, light wave transmissions substrate and light wave coupling output display component.Therefore structure is tight
Gather, be in light weight, big visual field and high-resolution image show the requirement met required for always such optical system.Wherein
Big visual field and light weight are particularly important, and in some application scenarios, the scope of visual field can directly influence the safety and in real time of personnel
The observation of information.Although required visual field can be met using conventional imaging method, with the increase of field of view angle, can make
The weight and volume overall into optical system also increases therewith, therefore seeks compact-sized, in light weight while meet that visual field is big again
Optical system design become it is such imaging display system trend.
In order to solve the problems, such as that tradition shows optical module because optical imaging system weight and volume causes, the present invention is set
The light folded waveguide display device of prism-coupled is counted.
The content of the invention
In order to solve the above problems, the invention provides a kind of folding extension based on prism-coupled to show optical waveguide
Part.
In order to achieve the above object, present invention employs following technical scheme：
The light folded waveguide display device of prism-coupled, it is characterised in that：Include successively：Display light source, for sending display institute
Need the display light wave of image；Collimation lens, the light wave that display light source is sent is collimated；Couple prism, collimated for changing
The direction of propagation of light wave；Light wave couples input module, and the optical signal coupling in the external world is input in substrate；Light wave folds transmission lining
Bottom, the light wave inputted to coupling, which carries out reflection propagation, makes its reach outgoing position；Light wave couples output precision, by from substrate
Light wave coupling output；Light wave expansion module, the light wave of coupling output is expanded.Wherein, collimation lens is located at image light source
Between couple prism, couple prism is located at the top of light wave coupling input module, light wave coupling input module and light wave coupling
Output precision folds transferring substrate with light wave respectively and connected, and positioned at the both ends of transferring substrate, light wave expansion module couples with light wave
The lower surface of output precision is connected.It is of the invention mainly to utilize prism-coupled light wave, total reflection and the realization of visual angle amplification principle.
Collimation lens is collimated the light wave from display light source, reaches the requirement of visual optical instrument, and the optical signal after collimation enters
Couple prism surface is mapped to, changes the transmission direction of light wave using the principle of prism erecting, is incident upon light wave coupling input
The surface of component, the optical signal in the external world is coupled in substrate so as to realize, recycling the folded waveguide substrate of special construction makes
Light wave is carried out lossless transmission in the form of total reflection and reaches light wave coupling output precision in the substrate, is broken using prismatic reflection face
The total reflection condition of bad light wave in the substrate, its coupling is output to substrate, reach extension light beam component, to the light of coupling output
Ripple is deployed, so as to reach the effect of increase visual field.
In optical waveguide device provided by the invention, also have the feature that：Collimation lens uses single aspherical mirror,
The reflecting surface of coupling input module is coated with Anti-reflective coating.
In optical waveguide device provided by the invention, also have the feature that：Light wave expansion module is by prism beam expander list
Member composition, the tiltangleθ e of wherein prism beam expander unit should possess sufficiently large angle, such as 45 °, so as to by image spreading to entirely
Screen.
In optical waveguide device provided by the invention, also have the feature that：Light wave couples the reflecting surface of input module
Couple with angle β ' the in and light wave of input face and meet between the reflecting surface of output precision and the angle β out of output face with ShiShimonoseki
System：
β'in=βout。
In optical waveguide device provided by the invention, also have the feature that：Light wave folds the lower surface of transferring substrate
Folded with the angle α sub1 and light wave of horizontal plane below meeting between the upper surface of transferring substrate and the angle α sub2 of horizontal plane
Relation：
αsub2=αsub1。
Compared with existing imaging guides system, beneficial effects of the present invention can be：Using prism-coupled, light wave is increased
Couple the energy of input waveguide substrate, reduce the volume of optical system.Using folding transferring substrate so that in direction of observation
Different angle at can observe image information, expand the visual field of observer.Compared to traditional display system, in phase
Under same volume, imaging viewing field of the invention is bigger, and structure is also more compact, light and handy.Imaging system of the present invention can be used for wearable
The fields such as display, illumination path and mobile display.
Brief description of the drawings
Fig. 1 is the schematic diagram of the light folded waveguide display device of prism-coupled of the present invention；
Fig. 2 is the light wave expansion module schematic diagram of the light folded waveguide display device of prism-coupled of the present invention；
Fig. 3 uses light schematic diagram during direct coupling system for the light folded waveguide display device of prism-coupled of the present invention；
Light schematic diagram when Fig. 4 is using 45 degree of apex angle prism as couple prism；
Light schematic diagram when Fig. 5 is using 60 degree of apex angle prism as couple prism；
Fig. 6 is light schematic diagram when right-angle prism is respectively adopted as couple prism and coupling input module；
Fig. 7 is light when 45 degree of apex angle prisms and 60 degree of apex angle prisms are respectively adopted as couple prism and coupling input module
Line schematic diagram；And
Fig. 8 is a kind of prism-coupled application example of the light folded waveguide display device of prism-coupled of the present invention.
Embodiment
The specific works engineering of the present invention is described below in conjunction with accompanying drawing.
Fig. 1 is the schematic diagram of the light folded waveguide display device of prism-coupled of the present invention, as shown in figure 1, optics of the present invention
The system composition of device includes：Display light source 10, collimation lens 11, couple prism 12, light wave coupling input module 13, light wave folding
Folded transferring substrate 14, light wave coupling output precision 15, light wave expansion module 16.Collimation lens 11 is by the light from display light source 10
Ripple is collimated, and reaches the requirement of visual optical instrument, and the optical signal after collimation incides the surface of couple prism 12, utilizes rib
The principle of mirror image rotation changes the transmission direction of light wave, is incident upon the surface of light wave coupling input module 13, so as to realize by
Extraneous optical signal is coupled in substrate, recycles the folded waveguide substrate 14 of special construction and makes light wave in the substrate with total reflection
Form carry out lossless transmission and reach light wave coupling output precision 15, destroy light wave in the substrate complete using prismatic reflection face
Conditioned reflex, its coupling is output to substrate, reach extension light beam component 16, the light wave of coupling output is deployed, so as to
Reach the effect of increase visual field.Effect below for each part of the present invention gives to illustrate accordingly.
Display light source 10 is mainly used in sending the display light wave of image needed for display.It is commonly used aobvious in micro display field
Show that light source has LCD, OLED, LCOS etc..Different Display Techniques corresponds to different requirements, in order in volume to system
Overall structure optimize, while it is also contemplated that the uniformity of light source each point brightness, generally select that volume is suitable, brightness uniformity
Display light source of the light source as micro display system, such as Lcos.But due to the resolution ratio of the LCD currently used for micro display system
It is limited, in order to improve the resolution ratio of image, it may be considered that cost-effective LCOS.LCOS is far above LCD in the efficiency of light energy utilization,
For the higher occasion generally use LCOS of display brightness.The polarization state for the light wave launched due to different display systems is not
Together, in order to meet the requirement of optical design, generally biasing mating plate before source is shown in aobvious light, for changing the light from display system
The polarization state of ripple.
Collimation lens 11 is used to collimate the light wave that display light source is sent.In micro display system, human eye is as most
Whole image information receiver to the light wave from image, it is necessary to be collimated to reach the comfort level and definition of human eye viewing
Requirement, for this commonly use lens to display light wave collimate.Due to the presence of the aberration of lens in itself, image is after lens
Astigmatism, distortion, curvature of field etc. can occur, need to carry out aberration correction according to application requirement collimation lens for this, to reach most
Preferable effect eventually, otherwise can influence the resolution ratio of optical system, decline the display quality of image.Because common spherical mirror exists
, it is necessary to which the lens combination for having different materials and radius of curvature forms when correcting aberration, this can make the weight and volume of whole system
Increase.Therefore higher occasion is required for overall volume, generally use aspherical mirror completes the correction of aberration, due to rectifying
During positive aberration, single aspherical mirror can be achieved, so as to which the overall structure and weight to system bring benefit.
Couple prism 12 is used for the direction of propagation for changing collimated light waves, is traveled to image information separately from a position with this
One desired position, substantially reduces light path, so as to reduce the overall structure of system.In order to make the light wave after collimation can
To enter in couple prism, it is necessary to consider the angle of visual field of couple prism, otherwise the optical information from picture system will occur
Lose, cause the visual field of display light source to be reduced, cause the waste of image display system size, influence display system entirety
Physical dimension.
Light wave coupling input module 13 is made up of reflecting surface, for the optical signal coupling from the external world to be input to folding
In folded substrate.Due to entering the light in coupling assembly when inciding reflecting surface, incidence angle is likely less than the critical of total reflection
Angle.In order to make light wave is as much as possible to be coupled in substrate, the technology of generally use plating Anti-reflective coating inputs to improve coupling
The reflectivity of component reflecting surface.Due to reflecting surface directly and air contact, above-mentioned effect is generally realized by plating layer oxide film
Fruit, such as pellumina.
Light wave folds the visual field amplification that transferring substrate 14 is mainly used in will be coupled into the light wave in substrate, and in order to protect
The lossless of light-wave energy transmission is demonstrate,proved, when the light wave is propagated in the substrate, meets the condition of total reflection.Transmitted due to folding
The presence of substrate, image information can be observed at the different direction of observations in the certain expanded- angle of opposite side of substrate,
So as to expand the visual field of observer.
Light wave coupling output precision 15 is made up of reflecting surface, is mainly used in coupling the optical signal propagated in the substrate
Export substrate.Meet the condition of total reflection when being transmitted in the substrate due to light wave, to make light wave coupling output, it is necessary to light is existed
Incidence angle during substrate tip transition is less than the cirtical angle of total reflection, is that this is special in the end of substrate introducing light wave coupling output group
Part.So that light, when on the reflecting surface for reaching light wave coupling output precision, incidence angle is less than the cirtical angle of total reflection so as to couple
It is output to outside substrate.
Light wave expansion module 16 is made up of prism beam expander unit.For the light of coupling output substrate, due to diverging
Visual field that angle is too small when causing directly to observe output image is too small, and the energy for being coupled into receiver is very low, therefore need to introduce exhibition
Open component to expand the light wave of coupling output, so as to expand observation visual field, and improve the light wave energy for being coupled into receiver
Amount.When expansion module expands to the light wave of coupling output, each prism unit can individually be imaged output optical signal, effect class
Like mirror imaging, so as to which overall expand observes visual field.
The job step and exemplary application of the light folded waveguide display device of prism-coupled of the present invention：
Fig. 2 is the light wave expansion module schematic diagram of the light folded waveguide display device of prism-coupled of the present invention.Light as shown in Figure 2 A
The vertical coupled output substrate after the reflection of light wave coupling output precision of line 20, and enter the prism beam expander of light wave expansion module
Unit.Light beam 20 enters the side surface 22 of arrival prism after prism beam expander, and for extended field of view, light reaches prism side surface 22
Energy should be transmitted all as far as possible afterwards, so as on the one hand avoid due to ghost phenomena caused by the change of the light direction of propagation,
On the other hand each surface brightness of extension prism can be made to keep homogeneous.Light 21 is by light wave coupling output as shown in Figure 2 B
The reflection rear-inclined coupling output substrate of component, and enter the prism beam expander unit of light wave expansion module.Light beam 21, which enters, to be expanded
After prism reach prism side surface 22, in order to extended field of view and avoid reflecting surface to the incident light zone of reflections come ghost image, it is necessary to
The side surface of prism unit is specifically handled, makes it that there is passivation to the light for inciding its surface, so that
Incident ray can unhinderedly pass through prism unit, so as to be extended to the locus of incident light wave.
Fig. 3 is that the light folded waveguide display device of prism-coupled of the present invention uses light during direct coupling system to illustrate
Figure.The light 30,31 sent by spot light Sour impinges perpendicularly on the anti-of light wave coupling input module after being collimated collimated
Face is penetrated, enters substrate transport through reflection coupling.The problems such as actual error and technique are considered in optical design, typically puts light source
Put near the focal plane of collimation lens.Light wave is coupled in substrate using direct-coupled mode, although in optical system
On can reduce the overall dimensions of system, but a series of problems that coupling efficiency is low and veiling glare is brought is direct coupling
The ultimate challenge of conjunction mode.When carrying out direct-coupling, it is contemplated that the light wave after collimation may directly enter because reflection angle is excessive
Enter substrate, need to be subject to diaphragm Aper on collimation lens for this.After introducing diaphragm the length of optical system increased,
And then it have impact on the overall mechanical dimension of system.Need to find a kind of coupled modes of new suitable structure of the present invention for this.
Light schematic diagram when Fig. 4 is using 45o apex angle prism as couple prism.Display light source S1 is located at collimation lens
Focal plane.It is made up of because light source can be regarded as countless spot lights, therefore three point A, B, C, wherein A, B point is taken on light source S1
Respectively at the lower edges of light source, C points are located on optical axis Axis.Due to making using 45o apex angle prisms Prism-45
For couple prism, therefore have：
α2s=45o
Wherein α 2s are prism Prism-45 base angle.
Couple prism Prism-45 working face is incided after the collimated collimated of light that point A is sent with α fov angles
Sur1, the light that point B is sent are reflected with α in angles in prism working face Sur1, in order to make to be refracted into prism
Prism-45 light can all be reflected by prismatic reflection face, it is necessary to consider the prism Prism-45 angle of visual field, otherwise part
The energy of light wave will be refracted out reflecting surface.
Because the prism of different materials, the cirtical angle of total reflection are also different.In order to describe the problem, we select prism Prism-
45 material is K9 glass（nd=1.5163）, so cirtical angle of total reflection Io=42o of prism.Because
90-α2s > α2s-Io
Therefore prism Prism-45 angle of visual field ω o are
n*sin(α2s-Io)=sinωo
Bringing related data into can obtain：
ωo=5o53‘
Therefore
ωo=αin=αfov=5o53’
Wherein α fov are the angle of visual field above light source S1.α in are the first working face of the incident ray that B points are sent and prism
The angle of Sur1 normals.
So when the angle after the collimated collimated of the light that each point is sent on light source S1 with optical axis is less than ω o, this
A little light can be totally reflected by the reflecting surface of prism.
Light into prism Prism-45 is coupled out the working face of prism after the total reflection in prismatic reflection face
Sur2.Because α 2s are 45o, therefore can obtain
αout=αin=5o53’
Wherein α out are the angle of emergent ray and working face Sur2 normals.
Due to the presence of above-mentioned condition, the uniformity of emergent ray and emergent ray in dimensional orientation is ensure that, so as to protect
The integrality of image information is demonstrate,proved.
Light schematic diagram when Fig. 5 is using 60o apex angle prism as couple prism.The couple prism of different angle, its
The locus of emergent ray also can be different therewith.If entanglement occurs for the locus of light, it may result in final image and show
Occurs ghost image when showing, so as to can not clearly show the image information of needs.As shown in figure 5,60o apex angle prisms
Prism-60 base angle 3s meets following condition：
α3s=30o。
Image light source Sour2 is located at the focal point of collimation lens, and its surface spot light M sends two light, collimated
Mirror collimation after impinge perpendicularly on prism Prism-60 the first working face S1 surfaces, after occur on the reflecting surface Sref of prism
Reflection, meet：
α=αdev1+αcent ①
sin(αdev2)=n*sin(αdev1) ②
α=90o-α3s ③
Wherein α cent are the angle of optical axis and reflecting surface Sref normals in prism Prism-60, and α dev1 are prism Prism-60
In reflection light and interior optical axis angle, α is the angle of incident ray and reflecting surface Sref normals, and α dev2 are emergent ray
With the angle of the second working face S2 normals.Bring 1. α 3s=30o into 2. 3. formulas, can obtain：
αcent=30o
αdev1=30o
αdev2=48.59o
The incident light of optical axis is accordingly parallel to after prism Prism-60 reflection, is not emitted parallel to optical axis.This
Overall offset is occurred into for the locus for causing light, so as to influence the overall dimensions of coupled system.And enter for deviateing optical axis
The light penetrated is possible to not to be emitted by the locus of incidence, and image will be caused integrally to misplace, can not be distinguished final
Display image.
Fig. 6 is light schematic diagram when right-angle prism is respectively adopted as couple prism and coupling input module.In order that
The light of collimated incident can fully enter couple prism Prism-s1, it is necessary to assure prism Prism-s1 the first working face
Height H1 be more than collimation lens diameter, otherwise will influence light-wave energy coupling efficiency.For prism Prism-s1 and
Prism-s2, in order to ensure the indeformable of ray space position, for base angle 6in and α ' 6in, generally ensure：
α6in=α'6in。
The light sent by light source surface point light source Q parallel optical axis after the collimation of collimation lens incides prism
Prism Prism-s1 the first working face, by the reflection in prismatic reflection face, finally reflect prism Prism-s1 the second work
Make face.Because the locus of emergent ray is misplaced, to guarantee to be coupled into prism Prism-s2, prism
With respect to Prism-s1 relative displacement should occur for Prism-s2, otherwise deviate the incident light of optical axis and will be unable to enter prism Prism-
s2.The generation of relative displacement by influence system lateral dimension L1, cause the size of system integrally to increase.Furthermore due to coupling
Light into prism Prism-s2 maintains the locus of incident ray, will be unable in the substrate to meet optical design
Light transmission direction is transmitted.
Fig. 7 is light when 45o apex angle prisms and 60o apex angle prisms is respectively adopted as couple prism and coupling input module
Line schematic diagram.Wherein couple prism P-45 base angle meets：
α7in=45o
The base angle for coupling input module prism P-60 meets：
α'7in=30o
Incided by the light source surface point light source S light sent after the collimation of collimation lens with the direction parallel to optical axis
Second working face of prism P-45 the first working face, then the reflective vertical injection prism P-45 through prismatic reflection face.Outgoing
Spatial offset does not occur for light, therefore maintains the spatial information amount of image information.
The light for being coupled out prism P-45 is impinged perpendicularly in prism P-60, and due to α ' 7in=30o, reflection light will deviate from
Optical axis, meet waveguide transmission requirement.Incident ray is after the reflection of reflecting surface, its incidence angle
Γ = 30o < I。= 42o
Therefore, part light-wave energy will reflect coupling assembly, and reflection can be improved by the way that corresponding reflectance coating is deposited for this
Light-wave energy.During due to using prism P-45 coupling light waves, the locus of incident ray and emergent ray does not misplace, coupling
The input face of output face and coupling assembly keeps identical size L2 that efficient coupling can be achieved, and this largely subtracts
The small overall dimensions of system.
Fig. 8 is a kind of prism-coupled application example of the light folded waveguide display device of prism-coupled of the present invention.In order to
The course of work of device is enough explained, below will be by specific parameter come illustrated example.Wherein
βin=45o
β'in=βout=30o
Wherein β in are couple prism P-E base angles, and β ' in are the angles of coupling input prismatic reflection face and input face, and β out are
Couple output prism reflecting surface and the angle of output face.
αsub2=αsub1=15o
Wherein α sub1 are the angles of folded substrate lower surface and horizontal plane, and α sub2 are folded substrate upper surface and horizontal plane
Angle.
θe=60o
Wherein θ e are the inclinations angle of prism beam expander unit.In order to realize total reflection of the light wave on prism beam expander surface, θ e can not be too
It is small, part light-wave energy otherwise will be caused to spill and expand assembly unit.
With above-mentioned parameter designing optics, the light 80,82 of the same light wave from light source surface point light source P passes through
Collimation lens P-N collimation, impinge perpendicularly on couple prism P-E the first working face, after by prismatic reflection face reflective vertical
Output prism P-E the second working face, incide the upper surface of light wave coupling input module.Because light 80,82 is by collimating
The collimation of lens, it can expeditiously enter coupling input module.Reflection through overcoupling input module reflecting surface, light quilt
The angle of light and fold surface normal is big when coupling and be input in folded waveguide substrate, and must assure that propagation in the substrate
In the cirtical angle of total reflection, otherwise with light transmission in the substrate because refraction, energy can occur significantly to lose, finally
Cause the energy of coupling output substrate too small, reduce the overall brightness of image.The light for being coupled into substrate is final by transmission
The reflecting surface of light wave coupling output precision is reached, and then is reflected to the lower surface of coupling output precision.Light now due to
It is unsatisfactory for the condition of total reflection, it will be coupled out extending in prism assemblies.Because prism assemblies are to incident ray direction
With selective penetrated property, and in the case where keeping radiation direction constant, each prism can be individually imaged, so that light
Ripple is uniformly distributed in prism assemblies, is able to extend light and is transmitted.For different applications, the quantity for extending prism assemblies can
Accordingly to increase and decrease, but allow for the image of display light source can be fully deployed, otherwise will lose the effect of visual field extension.
Embodiment acts on and effect
Optics in the embodiment of the present invention, due to folding the presence of transferring substrate so that the different angles in direction of observation
Image information can be observed at degree, so as to expand the visual field of observer.
Optics in the embodiment of the present invention, it is specific due to having been done to the reflecting surface of prism beam expander in light wave expansion module
Processing, the ghost problems brought when on the one hand reflecting surface can be avoided to reflect incident light wave on the other hand can be to incidence
Light to reflecting surface is passivated, so as to so that incident ray flows unobstructed through reflecting surface, to the space of incident light wave
Position is extended.
Optics in the embodiment of the present invention is made up of seven parts, and phase can be carried out to each part for concrete application
The extension answered, so as to the application of further lifting system.Such a optical system cannot be only used for wearable display, it is also possible to
In the field such as Uniform Illumination and mobile display.
Optics in the embodiment of the present invention, α sub1 and α sub2 angle are not limited in 15o, as long as meeting incident
Light meets the condition of total reflection on its reflecting surface.
Optics in the embodiment of the present invention, θ e size also not only limits and 60o, as long as meeting light in extension element
In prism beam expander surface propagate when can realize total reflection.
Claims (5)
1. the light folded waveguide display device of prism-coupled, includes successively：
Display light source, for sending the display light wave of image needed for display；
Collimation lens, the light wave that display light source is sent is collimated；
Couple prism, for changing the direction of propagation of collimated light waves；
Light wave couples input module, and the optical signal coupling in the external world is input in substrate；
Light wave folds transferring substrate, and the light wave inputted to coupling, which carries out reflection propagation, makes its reach outgoing position；
Light wave couples output precision, and the light wave from substrate is coupled into output；
Light wave expansion module, the light wave of coupling output is expanded,
Wherein, for collimation lens between image light source and couple prism, couple prism is located at the upper of light wave coupling input module
Side, light wave couples input module and connected respectively with light wave folding transferring substrate with light wave coupling output precision, positioned at transferring substrate
Both ends, the lower surface of light wave expansion module and light wave coupling output precision is connected.
2. optics according to claim 1, it is characterised in that：
Collimation lens uses single aspherical mirror, and the reflecting surface for coupling input module is coated with Anti-reflective coating.
3. optics according to claim 1, it is characterised in that：
Light wave expansion module is made up of prism beam expander unit, and the tiltangleθ e of wherein prism beam expander unit should possess sufficiently large angle
Degree, so as to by image spreading to full frame.
4. optics according to claim 1, it is characterised in that：
The reflecting surface of light wave coupling input module coupled with angle β ' the in and light wave of input face the reflecting surface of output precision with it is defeated
Meet following relation between the angle β out to appear：
β'in=βout。
5. optics according to claim 1, it is characterised in that：
Light wave folds the lower surface of transferring substrate and the angle α sub1 and light wave of horizontal plane fold upper surface and the water of transferring substrate
Meet following relation between the angle α sub2 of plane：
αsub2=αsub1。
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| CN201710989792.3A CN107703632A (en) | 2017-10-23 | 2017-10-23 | The light folded waveguide display device of prism-coupled |
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| CN201710989792.3A CN107703632A (en) | 2017-10-23 | 2017-10-23 | The light folded waveguide display device of prism-coupled |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983425A (en) * | 2018-08-29 | 2018-12-11 | 深圳珑璟光电技术有限公司 | A kind of nearly optics of the eye display device of two-dimensional exit pupil extension waveguide |
| CN113424085A (en) * | 2019-02-11 | 2021-09-21 | 脸谱科技有限责任公司 | Dispersion compensation for optical coupling through inclined surfaces of optical waveguides |
| CN115016122A (en) * | 2020-02-19 | 2022-09-06 | Oppo广东移动通信有限公司 | Head-mounted device |
| WO2023030516A1 (en) * | 2021-09-06 | 2023-03-09 | 维沃移动通信有限公司 | Optical system and wearable device |
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| CN104536137A (en) * | 2015-01-25 | 2015-04-22 | 上海理湃光晶技术有限公司 | Folding expanding optical waveguide device for image display |
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| CN104536140A (en) * | 2015-01-24 | 2015-04-22 | 上海理湃光晶技术有限公司 | Folding extension display optical device based on prism coupling |
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| CN104536140A (en) * | 2015-01-24 | 2015-04-22 | 上海理湃光晶技术有限公司 | Folding extension display optical device based on prism coupling |
| CN104536137A (en) * | 2015-01-25 | 2015-04-22 | 上海理湃光晶技术有限公司 | Folding expanding optical waveguide device for image display |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983425A (en) * | 2018-08-29 | 2018-12-11 | 深圳珑璟光电技术有限公司 | A kind of nearly optics of the eye display device of two-dimensional exit pupil extension waveguide |
| CN113424085A (en) * | 2019-02-11 | 2021-09-21 | 脸谱科技有限责任公司 | Dispersion compensation for optical coupling through inclined surfaces of optical waveguides |
| CN115016122A (en) * | 2020-02-19 | 2022-09-06 | Oppo广东移动通信有限公司 | Head-mounted device |
| WO2023030516A1 (en) * | 2021-09-06 | 2023-03-09 | 维沃移动通信有限公司 | Optical system and wearable device |
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