CN106291939A - A kind of virtual reality display optical system - Google Patents

Abstract

This application discloses a kind of virtual reality display optical system, including the LCDs set gradually along optical axis direction, lens combination and diaphragm, the light that described LCDs sends is incident to described diaphragm and then entrance human eye eye pupil after described lens combination reflects, described lens combination includes: convex lens, the convex lens front surface relative with described diaphragm is Fresnel surface, convex lens rear surface is aspheric surface, and described convex lens front surface and described convex lens rear surface all have predetermined angle to tilt relative to the pitch orientation being perpendicular to eye pupil optical axis；Meniscus lens, meniscus lens front surface is relative with described convex lens rear surface, and meniscus lens rear surface is relative with described LCDs.Can correct and reduce optical aberration, little optical aberration good imaging quality well, promote image quality, meanwhile, contain Fresnel by this optical system and form light path with aspheric lens combination and expand visual field by the optimization design of software.

Description

A kind of virtual reality display optical system

Technical field

The present invention relates to optical technical field, more particularly, it relates to a kind of virtual reality display optical system.

Background technology

At present, the key Design point that have to consider during virtual reality display design of Optical System be big visual field, high thoroughly Cross rate, high-performance.Big view field imaging beneficially virtual implementing helmet wearer experiences high-immersion, and can provide abundant number According to quantity of information, high permeability is conducive to improving the efficiency of light energy utilization of image source module, under equal visual brightness, image source module Output is low, is provided to, after being equipped with lithium battery, the use time that wearer is longer, and high-performance is embodied in optical system self Optical property feature, for virtual reality display optical system, mainly include distort easy correcting property, complete machine weighing body Long-pending small and exquisite, highly integrated etc..

Virtual reality display optical system is divided from optical texture mainly two kinds: coaxial-type and off-axis formula.Wherein, from Shaft type virtual reality display optical system many employings catadioptric optical structure, by eye pupil front group clutch, relay imaging light System forms.Eye pupil front group clutch uses face type to be sphere or non-spherical reflector, is coated with certain films layer and realizes vision increasing Strong or virtual enhancing function；Relay imaging optical system uses the combination of transmission optical component, the inclination of transmissive element and bias Being beneficial to correct astigmatism, distortion, transmission wedge-shaped element is conducive to existing positive coma, astigmatism, chromatic longitudiinal aberration, also wraps in relay optical system Including diffraction element, utilize its order of spectrum time Diffraction fringe distribution correction chromatic longitudiinal aberration, second order spectrum etc., expander graphs image source visual color is believed Breath.The coaxial virtual reality display optical system rotationally symmetrical transmissive element of many employings, has processing relatively easy, imaging viewing field The feature being of moderate size.Additionally, not tight to aspherical types coefficient precision in coaxial system during TOLERANCE ANALYSIS, beneficially digital controlled rotary Rubbing down, mirror interval and angle of wedge tolerance are the most loose, are suitable for high-volume processing.

But, virtual reality display optical system of the prior art has the aberrations such as the vertical axle such as coma, astigmatism, because of This, the aberration how reducing virtual reality display optical system is those skilled in the art's urgency technical issues that need to address.

Summary of the invention

For solving above-mentioned technical problem, the present invention provides a kind of virtual reality display optical system, it is possible to reduce virtual The aberration of reality displays optical system.

For achieving the above object, the present invention provides following technical scheme:

A kind of virtual reality display optical system, including the LCDs set gradually along optical axis direction, battery of lens Closing and diaphragm, the light that described LCDs sends is incident to described diaphragm after described lens combination reflects and then enters Entering human eye eye pupil, described lens combination includes:

Convex lens, the convex lens front surface relative with described diaphragm is Fresnel surface, and convex lens rear surface is aspheric surface, institute State convex lens front surface and described convex lens rear surface and all have predetermined angle relative to the pitch orientation being perpendicular to eye pupil optical axis Tilt；

Meniscus lens, meniscus lens front surface is relative with described convex lens rear surface, meniscus lens rear surface and described liquid Crystal display screen is relative.

Preferably, in above-mentioned virtual reality display optical system, the front surface of described meniscus lens and rear surface Being aspheric surface, the front surface of described meniscus lens and rear surface are relative to being perpendicular to the pitch orientation of eye pupil optical axis the most State predetermined angle.

Preferably, in above-mentioned virtual reality display optical system, the Fresnel center of described convex lens front surface Territory etching depth scope is 0.001mm～0.0014mm, and etching edge depth bounds is 0.0014mm～0.0018mm.

Preferably, in above-mentioned virtual reality display optical system, Fresnel surface type Z of described convex lens front surface₁ For:

$Z_1=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(K+1)c^2{r}^2}}+\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\∂}_i{r}^i$

Aspheric surface face type Z of described convex lens rear surface₂For:

$Z_2=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(K+1)c^2{r}^2}}+\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\∂}_i{r}^{2i}$

Wherein, c is vertex curvature, r be the front surface of described convex lens or rear surface to optical axis standoff height, K is circle Cone constant,For rotationally symmetrical high-order term coefficient, N is positive integer, and i is positive integer.

Preferably, in above-mentioned virtual reality display optical system, described convex lens rear surface and described meniscus lens The range accuracy scope of front surface is 0.01mm-0.02mm, described meniscus lens rear surface and described LCDs center Distance range is 0.02mm-0.03mm.

Preferably, in above-mentioned virtual reality display optical system, described convex lens front surface and described diaphragm away from It is 12mm-14mm from scope.

Preferably, in above-mentioned virtual reality display optical system, described convex lens front surface and described liquid crystal display The distance of screen is less than or equal to 77mm.

From technique scheme it can be seen that a kind of virtual reality display optical system provided by the present invention, including LCDs, lens combination and the diaphragm set gradually along optical axis direction, the light that described LCDs sends passes through Being incident to described diaphragm and then entrance human eye eye pupil after the refraction of described lens combination, described lens combination includes: convex lens, with institute Stating the relative convex lens front surface of diaphragm is Fresnel surface, and convex lens rear surface is aspheric surface, described convex lens front surface and Described convex lens rear surface all has predetermined angle to tilt relative to the pitch orientation being perpendicular to eye pupil optical axis；Meniscus lens, bent moon Lens front surface is relative with described convex lens rear surface, and bent moon rear surface is relative with described LCDs.

The virtual reality display optical system that the present invention provides, lens combination convexity lens front surface is Fresnel surface, Convex lens rear surface is aspheric surface, and the combination surface structure of this kind of aspheric surface and Fresnel surface can correct well and reduce light Learn aberration, concrete can the vertical axial aberration such as the coma of correct influences image quality, astigmatism, little optical aberration good imaging quality, Promoting image quality, it is three-dimensional with height that low distorted optical image quality can make to experience high-immersion during wearer's binocular viewing image Sense.

Meanwhile, contain Fresnel by this optical system form light path with aspheric lens combination and pass through the excellent of software Change design and expand visual field.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to The accompanying drawing provided obtains other accompanying drawing.

A kind of virtual reality display optical system schematic diagram that Fig. 1 provides for the embodiment of the present invention；

45 ° × 40 ° scopes of virtual reality display optical system central vision that Fig. 2 provides for another embodiment of the present invention Distortion figure；

85 ° × 80 ° scopes of virtual reality display optical system full filed that Fig. 3 provides for another embodiment of the present invention are abnormal Become figure.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.

Refer to a kind of virtual reality display optical system schematic diagram that Fig. 1, Fig. 1 provide for the embodiment of the present invention.

In a kind of detailed description of the invention, it is provided that a kind of virtual reality display optical system, including along optical axis direction LCDs 04, lens combination and the diaphragm 01 set gradually, the light that described LCDs 04 sends is through described Being incident to described diaphragm 01 after lens combination refraction and then enter human eye eye pupil, described lens combination includes: convex lens 02, with institute Stating the relative convex lens front surface of diaphragm 01 is Fresnel surface, and convex lens rear surface is aspheric surface, described convex lens front surface with And described convex lens rear surface all has predetermined angle to tilt relative to the pitch orientation being perpendicular to eye pupil optical axis；Meniscus lens 03, Meniscus lens front surface is relative with described convex lens rear surface, and meniscus lens rear surface is relative with described LCDs 04.

Wherein, convex lens is sequentially placed along described optical axis direction as meniscus lens, due to LCDs 04 Central shaft is not coaxial with eye pupil optical axis, therefore, and table after convex lens rotation asymmetry, and convex lens front surface and described convex lens Face all has predetermined angle to tilt relative to the pitch orientation being perpendicular to eye pupil optical axis, is not coaxial to make to preferably correct the two The image quality degradation that the aberration asymmetric distribution become causes.

LCDs 04 is as virtual reality display image forming source, and supported full-size is diagonal line length 4.5 inches, LCDs 04 includes two pieces of lcd screens, parallel upright is positioned over before human eye, for two eyes respectively Watching attentively, LCDs 04 forms dual pathways LCD screen.Lcd screen can be image planes LCD, the work of the light that image planes LCD send Make wave-length coverage 450nm～650nm.

When backlight is analyzed, Entry pupil diameters is 10mm, entrance pupil central projection to image planes LCD lower limb 32mm, and entrance pupil center is thrown Shadow is to image planes LCD top edge 50mm so that optical system field of view angle is 85 ° × 80 °.Two lcd screen central shaft spacing are more than 70mm, it is ensured that during binocular imaging, dual pathways LCD screen can use main flow high definition panchromatic 4.5 with laid parallel before human eye simultaneously During inch LCD screen, monocular pixel resolution reaches 1800 × 1700.Preferably, in battery of lens, convex lens 02 uses China's glass HQK3, meniscus lens 03 uses China glass HZF6, and the aspheric surface quadratic coefficients precision controlling being applied in battery of lens is at thousand points Eight, face type PV controls at 0.8 micron.

Wherein, as shown in Figures 2 and 3, in the virtual reality display optical system that Fig. 2 provides for another embodiment of the present invention 45 ° × 40 °, heart visual field scope distortion figure；The virtual reality display optical system that Fig. 3 provides for another embodiment of the present invention is complete 85 ° × 80 °, visual field scope distortion figure.In the range of 45 ° × 40 ° imaging viewing fields, maximum distortion 3.12%, average distortion 0.783%；In the range of 85 ° × 80 ° imaging viewing fields, maximum distortion 22.69%, average distortion 5.2%.Full filed becomes barrel-shaped abnormal Become, level and pitch orientation distortion symmetry, only change picture shape because distortion does not affect image definition, pass through Computer Compensation Well-corrected can be carried out, therefore, be not further added by optical element and carry out the correction of residual distortion.

In the present embodiment, convex lens 02, face, meniscus lens 03 surface shape parameter, element material, each optic thickness, each Optical surface spacing is as shown in table 1.

Table 1

The virtual reality display optical system that the present invention provides, lens combination convexity lens front surface is Fresnel surface, Convex lens rear surface is aspheric surface, and the combination surface structure of this kind of aspheric surface and Fresnel surface can correct well and reduce light Learn aberration, concrete can the vertical axial aberration such as the coma of correct influences image quality, astigmatism, little optical aberration good imaging quality, Promoting image quality, it is three-dimensional with height that low distorted optical image quality can make to experience high-immersion during wearer's binocular viewing image Sense.

Meanwhile, contain Fresnel by this optical system form light path with aspheric lens combination and pass through the excellent of software Change design and expand visual field.

On the basis of above-mentioned virtual reality display optical system, described meniscus lens 03 front surface and described bent moon Lens rear surface is aspheric surface, described meniscus lens 03 front surface and described meniscus lens 03 rear surface relative to being perpendicular to The pitch orientation of eye pupil optical axis all has described predetermined angle to tilt.

Wherein, predetermined angle scope is less, and described meniscus lens 03 front surface and described meniscus lens 03 rear surface tilt Angle is respectively 2 ° and 1 °.

On the basis of above-mentioned virtual reality display optical system, the Fresnel center of described convex lens 02 front surface Territory etching depth scope is 0.001mm～0.0014mm, and scope is 0.0014mm～0.0018mm.

On the basis of above-mentioned virtual reality display optical system, Fresnel surface type Z of described convex lens 02 front surface₁ For:

$Z_1=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(K+1)c^2{r}^2}}+\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\∂}_i{r}^i$

Aspheric surface face type Z of described convex lens 02 rear surface₂For:

$Z_2=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(K+1)c^2{r}^2}}+\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{\∂}_i{r}^{2i}$

Wherein, c is vertex curvature, and r is that described convex lens 02 front surface or described convex lens 02 rear surface are thrown to optical axis Shadow height, K is the constant of the cone,For rotationally symmetrical high-order term coefficient, N is positive integer, and i is positive integer.

On the basis of above-mentioned virtual reality display optical system, described convex lens 02 rear surface and described meniscus lens 03 The distance range of front surface is 0.01mm-0.02mm, described meniscus lens 03 rear surface and described LCDs 04 center Distance range is at 0.02mm-0.03mm.

Further, described convex lens 02 front surface is 12mm-14mm with the distance range of described diaphragm 01.Distance range Make people's eyelash for 12mm-14mm and convex lens 02 can be encountered, not affecting wear comfort, meet image quality herein simultaneously Design of Optical System by sufficiently complex and structure is big, heaviness is unfavorable for the marketization.

Further, in order to allow users to wear this headgear system for a long time, reduce the front pendant sense wearing generation, In above-mentioned virtual reality display optical system, the distance of described convex lens 02 front surface and described LCDs 04 less than or Person is equal to 77mm, optical system weight 96.65g.Distance between convex lens 02 and LCDs 04 is reduced, and then reduces The volume of optical system, reduces optical system quality.

In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other The difference of embodiment, between each embodiment, identical similar portion sees mutually.

Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention. Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one The widest scope caused.

Claims (7)

1. a virtual reality display optical system, including the LCDs set gradually along optical axis direction, lens combination And diaphragm, the light that described LCDs sends is incident to described diaphragm and then entrance after described lens combination reflects Human eye eye pupil, it is characterised in that described lens combination includes:

Convex lens, the convex lens front surface relative with described diaphragm is Fresnel surface, and convex lens rear surface is aspheric surface, described convex Lens front surface and described convex lens rear surface all have predetermined angle to tilt relative to the pitch orientation being perpendicular to eye pupil optical axis；

Meniscus lens, meniscus lens front surface is relative with described convex lens rear surface, meniscus lens rear surface and described liquid crystal Display screen is relative.

2. virtual reality display optical system as claimed in claim 1, it is characterised in that described meniscus lens front surface with And described meniscus lens rear surface be aspheric surface, described meniscus lens front surface and described meniscus lens rear surface relative to The pitch orientation being perpendicular to eye pupil optical axis all has described predetermined angle to tilt.

3. virtual reality display optical system as claimed in claim 2, it is characterised in that the phenanthrene of described convex lens front surface Nie Er central area etching depth scope is 0.001mm～0.0014mm, etching edge depth bounds be 0.0014mm～ 0.0018mm。

4. virtual reality display optical system as claimed in claim 3, it is characterised in that the phenanthrene of described convex lens front surface Nie Er face type Z₁For:

$Z_1=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(K+1)c^2{r}^2}}+\underset{i=1}{\overset{N}{\Σ}}{\∂}_i{r}^i$

Aspheric surface face type Z of described convex lens rear surface₂For:

$Z_2=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(K+1)c^2{r}^2}}+\underset{i=1}{\overset{N}{\Σ}}{\∂}_i{r}^{2i}$

Wherein, c is vertex curvature, and r is described convex lens front surface or described convex lens rear surface to optical axis standoff height, K For the constant of the cone,For rotationally symmetrical high-order term coefficient, N is positive integer, and i is positive integer.

5. the virtual reality display optical system as described in any one of Claims 1-4, it is characterised in that described convex lens The range accuracy scope of rear surface and described meniscus lens front surface is 0.01mm-0.02mm, described meniscus lens rear surface with The distance range at described LCDs center is 0.02mm-0.03mm.

6. virtual reality display optical system as claimed in claim 5, it is characterised in that described convex lens front surface and institute The distance range stating diaphragm is 12mm-14mm.

7. virtual reality display optical system as claimed in claim 6, it is characterised in that described convex lens front surface and institute State the distance of LCDs less than or equal to 77mm.