CN208569195U - A kind of nearly eye of compact free form surface waveguide shows Optical devices - Google Patents
A kind of nearly eye of compact free form surface waveguide shows Optical devices Download PDFInfo
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- CN208569195U CN208569195U CN201821401036.0U CN201821401036U CN208569195U CN 208569195 U CN208569195 U CN 208569195U CN 201821401036 U CN201821401036 U CN 201821401036U CN 208569195 U CN208569195 U CN 208569195U
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- prism
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Abstract
The utility model discloses a kind of nearly eye of compact free form surface waveguide and shows Optical devices.Described device includes: micro display screen, polarizing film, free curved surface prism and waveguide group；The free curved surface prism includes incident optical plane, the first optical surface and the second optical surface, the light that the micro display screen issues, after the polarizing film is polarized, sequentially enter the incident optical plane, the first optical surface and the second optical surface of the free curved surface prism, it is collimated into directional light and is incident to the waveguide group, enter human eye eye pupil after waveguide group reflection.Overall volume can not only be made to be substantially reduced and weight saving using the device of the utility model, and the image quality of device and the efficiency of transmission of energy can be greatlyd improve.
Description
Technical field
The utility model relates to light propagation fields, show optics more particularly to a kind of nearly eye of compact free form surface waveguide
Device.
Background technique
Head-mounted display for augmented reality can allow people while checking ambient enviroment, and virtual image is thrown
It is mapped to human eye, in military affairs, industry, amusement, medical treatment, the fields such as communications and transportation have great significance.The virtual image of projection can
To be superimposed upon on the real world of user's perception.For the transmission-type head-mounted display of augmented reality, traditional coaxial eyepiece dress
Set can not contradiction between requirement and miniaturization of the solving device to field angle, distance of exit pupil, the nearly eye of prior art waveguide
It shows Optical devices, causes bulky and thick and heavy using the optical plan that multi-disc prism group constitutes eyepiece device, influence user
Experience.
Summary of the invention
The purpose of the utility model is to provide a kind of nearly eyes of compact free form surface waveguide to show Optical devices, can be significantly
It reduces the volume of display Optical devices and mitigates weight, realize user's noninductive wearing for a long time, while greatly improving device
Image quality and energy efficiency of transmission.
To achieve the above object, the utility model provides following scheme:
A kind of nearly eye of compact free form surface waveguide shows Optical devices, described device include: micro display screen, polarizing film,
Free curved surface prism and waveguide group；The free curved surface prism includes that incident optical plane, the first optical surface and the second optics are bent
Face, the light that the micro display screen issues sequentially enter the free curved surface prism after the polarizing film is polarized
Incident optical plane, the first optical surface and the second optical surface are collimated into directional light and are incident to the waveguide group, by the wave
Enter human eye eye pupil after leading group reflection.
Optionally, described device further includes coupling inlet module, and the coupling inlet module is located at the free form surface rib
Between mirror and the waveguide group, the coupling inlet module, will for coupling the light that shown free curved surface prism issues
Light after coupling travels in the waveguide group.
Optionally, the micro display screen is Organic Light Emitting Diode or liquid crystal on silicon.
Optionally, the lens material of the free curved surface prism is optical glass or optical plastic.
Optionally, the waveguide group it is successively glued by 2 or more parallel tetragonal prisms and 1 or more Dove prism and
At.
Optionally, the sharp angle of the parallel tetragonal prism and the Dove prism is equal.
Optionally, the sharp angle range of the parallel tetragonal prism and the Dove prism is 10 °~80 °.
Optionally, the angular range of the base plane of the incident ray of the directional light and the waveguide group be 30 °~
80°。
Optionally, the substrate material of the waveguide group is optical glass or optical plastic.
According to specific embodiment provided by the utility model, the utility model discloses following technical effects: this is practical new
Type provides a kind of nearly eye of compact free form surface waveguide and shows Optical devices, replaces current be total to using a free curved surface prism
Axis eyepiece device is substantially reduced overall volume and weight saving, user's noninductive wearing for a long time may be implemented, in addition, freely
Curved surface prism has the characteristics of small aberration, small distortion, therefore its full filed range distortion generated is smaller than 1%, can be very big
Ground improves the image quality of device and the efficiency of transmission of energy.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without any creative labor, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is that the nearly eye of the utility model embodiment compact waveguide shows structure of optical means composition figure；
Fig. 2 is the utility model embodiment free curved surface prism composition figure.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
Fig. 1 is that the nearly eye of the utility model embodiment compact waveguide shows structure of optical means composition figure.As shown in Figure 1,
A kind of nearly eye of compact waveguide shows that Optical devices include micro display screen 001, polarizing film 002, free curved surface prism 003 and waveguide
Group 004.Micro display screen 001 is used as image source, that is, belongs to the object plane in imaging optical device, is issued by any one visual field point of object plane
Light, after polarizing film 002 enter free curved surface prism 003, be collimated into parallel light emergence, this collimated light beam continue to
Preceding propagation is coupled into waveguide group 004, and in waveguide group 004, light defers to catadioptric law, carries out in waveguide base internal
Transmission, light beam equivalent dimension increase, and are then divided slant reflection from the film of waveguide, finally, into human eye eye pupil 005, focus
On the retina at the virtual representation of micro display screen 001, namely complete virtual reality.
Object image of the micro display screen 001 as Optical devices, generally, it can be OLED (Organic Light-
Emitting Diode, Organic Light Emitting Diode), it can be LCOS (Liquid Crystal on Silicon, silicon substrate liquid
It is brilliant), it is also possible to the micro display chip with light-emitting function being made of other materials.
Free curved surface prism 003 refers to asymmetry, and irregularly, discomfort shares unified optical equations to describe
Optical surface belongs to off-axis aspheric surface optical device, and lens material can use optical glass or optical plastic, and optical glass has the trade mark
Such as K9, BK7, ZF52, optical plastic have PC (Polycarbonate, polycarbonate), PMMA (polymethyl
Methacrylate, polymethyl methacrylate).Free curved surface prism 003 has the characteristics of small aberration, small distortion, full filed
Range distortion is smaller than 1%.
Typically Conicoid fitting expression formula is
In formula, h2=x2+y2, c is the curvature on curved surface vertex, and K is quadratic surface coefficient, a4, a6... it waits as high order aspheric surface
Coefficient.
On the basis of above formula, the common expression formula of free form surface mainly has following three kinds of modes of texturing:
(1) the symmetrical double-curved surface of plane, equation are as follows:
Wherein, cxThe radius of curvature for being curved surface in X-Z plane, cyIt is radius of curvature of the curved surface in Y-Z plane, KxFor song
Quadratic surface coefficient of the face in sagitta of arc direction, KyQuadratic surface coefficient for curved surface in meridian direction, AiFor about Z axis rotation pair
4,6,8,10,12 claimed ... rank asphericity coefficient, PiIt is 4,6,8,10,12... rank non-rotational symmetry coefficient.
(2) XY polynomial surface is the multiple x for increasing highest exponential on the basis of quadratic surface and being not more than pmynIndividual event
Formula, descriptive equation are as follows:
1≦m+n≦p
Wherein, c is curvature, and K is quadratic surface coefficient, C(m,n)It is monomial xmynCoefficient.
(3) the polynomial formula of complex curvature XY is described as follows:
Wherein, cxAnd cyIt is the curvature of the sagitta of arc and meridian direction, K respectivelyxAnd KyIt is the secondary of the sagitta of arc and meridian direction respectively
Asphericity coefficient.
The source images light that micro display screen 001 exports is collimated after passing through 002 freedom of entry curved surface prism 003 of polarizing film,
Light after collimation is directional light, for convenience of analyzing, selects collimated light beam wherein 1 of zero visual field, is named as parallel rays
100。
Described device further includes coupling inlet module 010, and the coupling inlet module 010 is located at the free curved surface prism
Between 003 and the waveguide group 004, the coupling inlet module 010 be used for the light that issues shown free curved surface prism 003 into
Row coupling, the light after coupling is traveled in the waveguide group 004.
Parallel rays 100 spreads into forward coupling inlet module 010, according to law of refraction n1*sinI=n2*sin θ,
N1 refers to the refractive index of incident medium, and n2 refers to the refractive index of emergent medium, and I is incidence angle, refers to the folder of incident light Yu plane of incidence normal
Angle, θ are the angles of emergence, it is indicated that penetrate the angle of light Yu plane of incidence normal.
Coupling entrance 010 can be the surface polishing that material is optical glass or optical plastic, be also possible to a kind of embossment
Grating, the type of relief grating can be the balzed grating, of sub-wavelength perhaps oblique raster or depositing Ti O2Symmetrical grating,
Or the asymmetric sub-wave length grating of the symmetrical grating of plating multilayer film or arbitrary structures.When coupling entrance is optical glass or optics
When the surface polishing of plastics, light propagation law is according to law of refraction n1*sinI=n2*sin θ.When coupling entrance is embossment light
When grid, light propagation law is according to grating equation: d* (n1*sinI+n2*sin θ)=m* λ, n1 refers to the refractive index of incident medium,
N2 refers to the refractive index of emergent medium, and I is incidence angle, refers to that the angle of incident light Yu plane of incidence normal, θ are the angles of emergence, it is indicated that penetrate light
With the angle of plane of incidence normal, d refers to corresponding grating constant, and m refers to diffraction time, and λ refers to corresponding wavelength of light.
Waveguide group 004 can also be successively glued in order by 2 or more parallel tetragonal prisms and 1 or more Dove prism
It forms.By 5 parallel tetragonal prisms and 1 Dove prism, successively gluing forms Fig. 1 waveguide group 004 in order, and each parallel four
The sharp angle of angle prism is equal, and the sharp angle of each Dove prism is equal.Generally, the sharp angle of parallel tetragonal prism
Range can be at 10 °~80 °, and the sharp angle range of Dove prism can be at 10 °~80 °.More generally, each parallel tetragonal prism
One of sharp angle determine after, the sharp angle value of other parallel tetragonal prisms can be equal with it, and Dove prism
Acute angle it is also equal with parallel tetragonal prism sharp angle.In this way by 5 parallel tetragonal prisms and 1 Dove prism in order according to
Waveguide made of secondary gluing constitutes a big Dove prism, i.e. waveguide group 004 has 2 big planes being parallel to each other.In parallel
Light 100 travels in this 2 big plane, and incidence angle is greater than the angle of total reflection and meets total reflection law, and parallel rays 100 will be
Total reflection propagation is carried out inside waveguide 003.
Angle of total reflection θ=arcsin (1/n2), if incident substrate material is LaK3, then n2=1.75, θ=34.8 °, only
Incidence angle is greater than 34.8 ° in the big plane to be parallel to each other at base internal 2, then light meets total reflection law.
In waveguide group 004, coupling inlet module 010 and 004 substrate of waveguide group big plane included angle (acute angle) a be 30 °~
Between 80 °, it is preferable that setting angle a is 45 °, and substrate material is optical glass or optical plastic, and optical glass has the trade mark such as
K9, BK7, ZF52 etc., optical plastic have PC (Polycarbonate, polycarbonate), PMMA (polymethyl
Methacrylate, polymethyl methacrylate), for convenience of illustrating, settable substrate material is optical glass LaK3, then 0 regard
Field light (i.e. parallel rays 100) is 45 ° in the incidence angle of the big plane of substrate, is greater than LaK334.8 ° of the angle of total reflection, satisfaction is all-trans
Principle is penetrated, parallel rays 100 carries out total reflection propagation in 004 substrate of waveguide.By taking 40 ° of full filed angle diagonal line as an example, then water
Flat * 20.2 ° of vertical angle=35.2 ° X, then horizontal half-angle is 17.6 °.A-arcsin as long as (sin (17.6 °)/n2) >
Arcsin (sin (1/n2)), then full filed light is all satisfied total reflection principle, and light can be had in 004 base internal of waveguide
Effect spread, wherein n2 is 004 substrate refractive index of waveguide.When parallel rays 100 travels to inclined-plane 011, two light can be divided out,
What is wherein reflected is parallel rays 101, carries out reflection propagation according to reflection law, and another is still parallel rays 100, is only taken
The energy attenuation of band.Similarly, parallel rays 100 by inclined-plane 012, inclined-plane 013, inclined-plane 014, inclined-plane 015, can divide out respectively
Parallel rays 102, parallel rays 103, parallel rays 104, the parallel rays 105 of reflection.Inclined-plane 011, inclined-plane 012, inclined-plane
013, inclined-plane 014, the media coating of different reflectivity is coated on inclined-plane 015, wire grating can also be etched on inclined-plane, it is final tiltedly
Face reflectivity more preferably may be selected to make reflectivity between 10~30% between 1~50%.Inclined-plane 011, inclined-plane 012, tiltedly
Face 013, inclined-plane 014,015 adjacent bevel surfaces spacing of inclined-plane may be provided between 1~8mm, between more preferably settable adjacent bevel surfaces
It is interposed between 3~5mm.
Fig. 2 is the utility model embodiment free curved surface prism composition figure.As shown in Fig. 2, the free curved surface prism packet
Include positioned at bottom surface incident optical plane 303, positioned at the first free optical surface 301 in left side, positioned at the second free light on right side
Learn curved surface 302, the shape of free form surface structure is according to the incident optical plane distance d of light source and free curved surface prism, with same
The incident light beam strikes of any to free curved surface prism emergent ray reverse extending line converge to same point be constraint condition, lead to
It crosses and determination is iterated to the free optical surface position of free curved surface prism, make the object phase light inputted from micro-display 001
The coupling of parallel rays 100 is collimated into after capable of being totally reflected in free curved surface prism to be incident in waveguide group 004 and transmit.It is described
The substrate material of free curved surface prism is optical glass or optical plastic.Free curved surface prism can also be arranged for the utility model
The prism of multiple free form surfaces is not limited to only comprising two free optical surfaces.
The utility model provides a kind of nearly eye of compact free form surface waveguide and shows Optical devices, using a free form surface
Prism replaces current coaxial eyepiece device, is substantially reduced overall volume and weight saving, user's long-time nothing may be implemented
It arouses admiration and wears, in addition, free curved surface prism has the characteristics of small aberration, small distortion, therefore its full filed range distortion generated can
Less than 1%, the image quality of device and the efficiency of transmission of energy can be greatly improved.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Specific case used herein is expounded the principles of the present invention and embodiment, above embodiments
Explanation be merely used to help understand the method and its core concept of the utility model；Meanwhile for the general technology of this field
Personnel, based on the idea of the present invention, there will be changes in the specific implementation manner and application range.In conclusion
The content of the present specification should not be construed as a limitation of the present invention.
Claims (10)
1. a kind of nearly eye of compact free form surface waveguide shows Optical devices, which is characterized in that described device includes: micro display
Screen, polarizing film, free curved surface prism and waveguide group；The free curved surface prism include incident optical plane, the first optical surface and
Second optical surface, the light that the micro display screen issues sequentially enter the freedom after the polarizing film is polarized
Incident optical plane, the first optical surface and the second optical surface of curved surface prism are collimated into directional light and are incident to the waveguide group,
Enter human eye eye pupil after waveguide group reflection.
2. the nearly eye of compact free form surface waveguide according to claim 1 shows Optical devices, which is characterized in that the dress
Setting further includes coupling inlet module, and the coupling inlet module is between the free curved surface prism and the waveguide group, institute
Coupling inlet module is stated for coupling the light that shown free curved surface prism issues, the light after coupling is traveled to described
In waveguide group.
3. the nearly eye of compact free form surface waveguide according to claim 1 shows Optical devices, which is characterized in that described micro-
Display screen is Organic Light Emitting Diode, liquid crystal on silicon or the micro display chip with light-emitting function.
4. the nearly eye of compact free form surface waveguide according to claim 1 shows Optical devices, which is characterized in that it is described from
It is optical glass or optical plastic by the lens material of curved surface prism.
5. the nearly eye of compact free form surface waveguide according to claim 1 shows Optical devices, which is characterized in that the wave
Group is led to be formed by 2 or more parallel tetragonal prisms and 1 or more Dove prism gluing.
6. the nearly eye of compact free form surface waveguide according to claim 5 shows Optical devices, which is characterized in that described flat
The sharp angle of row tetragonal prism and the Dove prism is equal.
7. the nearly eye of compact free form surface waveguide according to claim 5 shows Optical devices, which is characterized in that described flat
The sharp angle range of row tetragonal prism and the Dove prism is 10 °~80 °.
8. the nearly eye of compact free form surface waveguide according to claim 5 shows Optical devices, which is characterized in that the wave
Lead the cuboid that group is regular shape.
9. the nearly eye of compact free form surface waveguide according to claim 1 shows Optical devices, which is characterized in that described flat
The angular range of the incident ray of row light and the base plane of the waveguide group is 30 °~80 °.
10. the nearly eye of compact free form surface waveguide according to claim 1 shows Optical devices, which is characterized in that described
The substrate material of waveguide group is optical glass or optical plastic.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732767A (en) * | 2018-08-29 | 2018-11-02 | 深圳珑璟光电技术有限公司 | A kind of nearly eye of compact free form surface waveguide shows Optical devices |
| CN112965247A (en) * | 2021-02-05 | 2021-06-15 | 杭州珑璟光电技术有限公司 | Projection optical system and near-to-eye display equipment |
-
2018
- 2018-08-29 CN CN201821401036.0U patent/CN208569195U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732767A (en) * | 2018-08-29 | 2018-11-02 | 深圳珑璟光电技术有限公司 | A kind of nearly eye of compact free form surface waveguide shows Optical devices |
| CN112965247A (en) * | 2021-02-05 | 2021-06-15 | 杭州珑璟光电技术有限公司 | Projection optical system and near-to-eye display equipment |
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