CN104614851B - One is worn eyepiece system and wears display device - Google Patents

One is worn eyepiece system and wears display device Download PDF

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Publication number
CN104614851B
CN104614851B CN201510039387.6A CN201510039387A CN104614851B CN 104614851 B CN104614851 B CN 104614851B CN 201510039387 A CN201510039387 A CN 201510039387A CN 104614851 B CN104614851 B CN 104614851B
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lens
eyepiece system
wear
luminescent screen
plus lens
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CN104614851A (en
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杨春
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Goertek Optical Technology Co Ltd
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Goertek Techology Co Ltd
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Priority to CN201510039387.6A priority Critical patent/CN104614851B/en
Priority to CN201610835992.9A priority patent/CN106249399B/en
Publication of CN104614851A publication Critical patent/CN104614851A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G02B25/04—Eyepieces; Magnifying glasses affording a wide-angle view, e.g. through a spy-hole
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G02B25/001—Eyepieces
    • 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
    • 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
    • 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
    • G02B2027/011—Head-up displays characterised by optical features comprising device for correcting geometrical aberrations, distortion
    • 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
    • G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention discloses one and wear eyepiece system and wear display device, described in wear eyepiece system and include: luminescent screen and two groups of eyepieces of right and left eyes；Setting gradually the first plus lens and the second minus lens to often organizing eyepiece between described luminescent screen at light path diaphragm, described first plus lens has positive light coke, including being convex to the first surface of diaphragm and being convex to the second surface of luminescent screen；Described second minus lens has negative power, including concaving towards the 3rd surface of diaphragm and concaving towards the 4th surface of luminescent screen.The technical program carries out appropriate design to focal length and the length of optical system, and to using the aspheric plastic lens of even to carry out Rational Arrangement, correct system aberration, in the case of the image quality ensureing system, realize miniaturization, lightweight and the demand of the big angle of visual field simultaneously.

Description

One is worn eyepiece system and wears display device
Technical field
The present invention relates to optical technical field, wear eyepiece system particularly to one and wear display device.
Background technology
Conventional display HMD (head mounted display) system of wearing has the angle of visual field little (general Less than 45 degree) shortcoming, greatly reduce the experience effect of viewing system, it is difficult to the sight immersed to people Shadow is felt, but general optical design can strengthen distortion and this optics of aberration while increasing visual angle The aberration of system, it is difficult to correction, can only go to process the way of image by later stage software, thus improve The design difficulty of machine system and cost, this is also that why to wear theaters market the most lukewarm Reason.
For being applied to wear the big angle of visual field eyepiece of display system, ratio chromatism, the curvature of field, astigmatism It is all the aberration affecting image quality, therefore needs a kind of suitably optical design badly and thoroughly solve the problems referred to above.
Summary of the invention
The invention provides one wear eyepiece system and wear display device, it is possible to obtaining the big angle of visual field While aberration correction, it is ensured that the viewing at big visual angle is experienced.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
On the one hand, wear eyepiece system described in include: luminescent screen and two groups of eyepieces of right and left eyes；From being The first plus lens and the second minus lens is set gradually to often organizing eyepiece between described luminescent screen at system diaphragm,
Described first plus lens has positive light coke, including being convex to the first surface of diaphragm and being convex to luminescent screen The second surface of curtain；
Described second minus lens has negative power, including concaving towards the 3rd surface of diaphragm and concaving towards luminescent screen 4th surface of curtain.
Preferably, the focal distance f of eyepiece system, the focal distance f of described first plus lens are worn described in1, second The focal distance f of minus lens2Meet following relational expression:
f1＞ 0, f2＜ 0, f1+f2＜ 0,
Overall length t of eyepiece system is worn described in it is further preferred thattl, the thickness t of described first plus lens1, The thickness t of the second minus lens2Meet following relational expression:
0.2 < t 1 f < 0 . 4,0.25 < t 1 t tl < 0.35,0.35 < t 1 + t 2 t tl < 0.45 ;
Wherein wear overall length t of eyepiece systemtlFor described first plus lens first surface and luminescent screen it Between distance.
The focal length wearing eyepiece system described in it is further preferred that is f=50mm, described first plus lens Focal length be f1=28mm, the focal length of the second minus lens is f2=-36mm；
The described overall length wearing eyepiece system is ttl=59mm, the thickness of described first plus lens is t1=18mm, the thickness of the second minus lens is t2=8mm.
Preferably, the first surface of described first lens and second surface, the 3rd table of described second lens Face and the 4th surface are even aspheric surface.
Preferably, described first plus lens and described second negative and positive lens are plastic material；
The ranges of indices of refraction of described first plus lens is 1.4 ＜ n1＜ 1.6, dispersion range is 50 ＜ v1＜ 75；
The ranges of indices of refraction of described second minus lens is 1.55 ＜ n2＜ 1.8, dispersion range is 20 ＜ v2＜ 30.
Preferably, described first plus lens is the plastic material of PMMA model, its refractive index n1=1.491786, dispersion v1=57.327362；
Described second minus lens is the glass material of H-LAK12 model, its refractive index n2=1.59, dispersion v2=29.9.
Preferably, the luminescent screen wearing eyepiece system described in is 1440P, 5.5 inches of thin film transistor (TFT) liquid Crystal display TFT-LCD.
The luminescent screen wearing eyepiece system described in it is further preferred that is divided into two sons by split screen technology Screen, shows the 2D image corresponding to right and left eyes or 3D rendering respectively.
The technical program wear eyepiece system by light path diaphragm to the often group mesh between luminescent screen Mirror sets gradually the first plus lens and the second minus lens, owing to this first plus lens has positive light coke, Make light collection allow the outer chief ray of axle bend towards optical axis simultaneously, and the second minus lens thereafter has negative light Jiao Degree, can correct residual aberration and aberration produced by front a piece of plus lens, the combination of so positive minus lens A reasonable picture quality can just be reached by aberration correction, again can school while ensure that big visual angle Positive aberration.
On the other hand, the invention provides one and wear display device, wearing including technique scheme Eyepiece system.
The display device of wearing of the technical program is capable of 72 ° of diagonal field of view angles, 63 ° of horizontal field of view Angle and optical system overall length less than 59mm, gross weight less than 34g, therefore, it is possible to meet lightweight, Miniaturization, the market demand at big visual angle.
Accompanying drawing explanation
Fig. 1 is the operation principle schematic diagram wearing display device；
The list group goggle structure schematic diagram wearing eyepiece system that Fig. 2 provides for the embodiment of the present invention；
The optical transfer function curve synoptic diagram wearing eyepiece system that Fig. 3 provides for the embodiment of the present invention；
The curvature of field curve synoptic diagram wearing eyepiece system that Fig. 4 provides for the embodiment of the present invention；
The distortion aberration curve synoptic diagram wearing eyepiece system that Fig. 5 provides for the embodiment of the present invention；
The point range figure wearing eyepiece system that Fig. 6 provides for the embodiment of the present invention；
The ratio chromatism, curve synoptic diagram wearing eyepiece system that Fig. 7 provides for the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to this Bright embodiment is described in further detail.
Fig. 1 is the operation principle schematic diagram wearing display device, and human eye watches display screen through eyepiece, aobvious The light that display screen sends is by this eyepiece, and forms a huge virtual image at distance human eye 19 meters, then Received by human eye.
When designing this optical system wearing display device, use reverse trace, make to wear display device Display location is positioned at diaphragm in the image planes position of optical system, eye-observation pupil；Wherein display screen is adopted With TFT-LCD display screen, (Thin Film Transistor-Liquid Crystal, tft liquid crystal shows Show device), it is used for reducing system bulk.
This optical system includes luminescent screen and two groups of eyepieces corresponding to right and left eyes, and luminescent screen shows Image by right and left eyes eyepiece enter right and left eyes, reach the big visual field visual experience of 3D or 2D.Its In often organize eyepiece and include a plus lens and a minus lens:
Described first plus lens is at the diaphragm of system, owing to it has positive light coke, can make light Converge and make the outer chief ray of axle bend towards optical axis simultaneously；
Described first minus lens, near the luminescent screen of system, has negative power, uses high-dispersive optical Residual aberration and aberration produced by a piece of plus lens before resin correction；So by the combination of positive minus lens All of aberration can just be corrected, and reach a reasonable picture quality.
Based on above-mentioned design philosophy, the invention provides one and wear eyepiece system, this wears eyepiece system Including: luminescent screen and two groups of eyepieces of right and left eyes.
The operation principle wearing eyepiece system of the present invention is: by the luminescent screen of system by split screen technology It is divided into two sub-screens, shows the 2D image corresponding to right and left eyes or 3D rendering respectively, make sub-screen On image by right and left eyes eyepiece enter right and left eyes, it is achieved the big visual angle visual experience of 2D or 3D. Wherein, the preferred 1440P of luminescent screen in the embodiment of the present invention, 5.5 inches of TFT-LCD display screens, After split screen display available, the size of two sub-screens is respectively 60.48mm*68.04mm, it is preferable that Dark slide can be added in actual applications, it is to avoid light leak affects Consumer's Experience between two sub-screens.
TFT-LCD is currently the only comprehensive at brightness, contrast, power consumption, life-span, volume and weight etc. Catch up with in performance and display device more than CRT, its function admirable, large-scale production characteristic comprehensively Good, automaticity is high, and the cost of raw material is cheap, and development space is wide, will rapidly become new century Main product, is a bright spot of 21 century global economy growth.
As in figure 2 it is shown, the list group goggle structure signal wearing eyepiece system provided for the embodiment of the present invention Figure, sets gradually the first plus lens L1 and the to often organizing eyepiece between luminescent screen at the diaphragm of system Two minus lens L2.
First plus lens L1 has positive light coke, including being convex to the first surface of diaphragm and being convex to luminescent screen The second surface of curtain；
Second minus lens L2 has negative power, including concaving towards the 3rd surface of diaphragm and concaving towards luminescent screen 4th surface of curtain.
In the preferred embodiment of the present invention, the above-mentioned focal distance f wearing eyepiece system, the first plus lens The focal distance f of L11, the focal distance f of the second minus lens L22Meet following relational expression:
f1＞ 0, f2＜ 0, f1+f2＜ 0,
Wear overall length t of eyepiece systemtl, the thickness t of the first plus lens L11, the thickness of the second minus lens L2 Degree t2Meet following relational expression:
0.2 < t 1 f < 0 . 4,0.25 < t 1 t tl < 0.35,0.35 < t 1 + t 2 t tl < 0.45 ;
Wherein wear overall length t of eyepiece systemtlIt is first surface 21 and the luminescent screen of the first plus lens L1 Between distance.
Concrete, this focal length wearing eyepiece system is f=50mm, and the focal length of the first plus lens L1 is f1=28mm, the focal length of the second minus lens L2 is f2=-36mm；
This overall length wearing eyepiece system is ttl=59mm, the thickness of the first plus lens L1 is t1=18mm, The thickness of the second minus lens L2 is t2=8mm.
In another preferred embodiment of the present invention, the first surface 21 of the first plus lens L1 and the second table 3rd surface 23 and the 4th surface 24 of face the 22, second minus lens L2 are even aspheric surface；First Plus lens L1 and the second negative and positive lens L2 is plastic material.The technical program is by using even aspheric Face plastic material lens, to ensure single group eyepiece miniaturization, lightweight, reduction cost, improve into simultaneously Picture element amount.
It is further preferred that the ranges of indices of refraction of the first plus lens L1 is 1.4 ＜ n1＜ 1.6, dispersion range is 50 ＜ v1＜ 75；
The ranges of indices of refraction of the second minus lens L2 is 1.55 ＜ n2＜ 1.8, dispersion range is 20 ＜ v2＜ 30.
Concrete, the first plus lens L1 is the plastic material of PMMA model, its refractive index n1=1.491786, dispersion v1=57.327362；
Second minus lens L2 is the glass material of H-LAK12 model, its refractive index n2=1.59, dispersion v2=29.9.
In technique scheme, this wears eyepiece system can reach following technical specification:
72 ° of diagonal field of view angles, 63 ° of horizontal field of view angles；
System overall length is less than 59mm, and gross weight is less than 34g；
Distance of exit pupil is 14mm；
The system compensation aberrations such as ratio chromatism, the curvature of field, astigmatism, image quality is preferable.
The present embodiment uses positive minus lens to combine distortion and the aberration of correction system, by appropriate design system And the relation of focal length, length and the thickness between each lens, and the even of employing plastic material is non- The aberration of the lens recovery system of sphere, it is ensured that wear eyepiece system and can obtain the same of the big angle of visual field Time, thoroughly correct the aberrations such as ratio chromatism, the curvature of field, astigmatism.
Another embodiment of the present invention is supplied to one and wears display device, and this is worn display device and includes Technique scheme wear eyepiece system.
It is capable of 72 ° of diagonal field of view angles, 63 ° of horizontal field of view owing to wearing the optical system of display device It is 14mm less than 34g, distance of exit pupil that angle and optical system overall length are less than 59mm, gross weight, Therefore, it is possible to make this wear display device meet miniaturization, lightweight, the market demand at big visual angle.
The optical transfer function curve synoptic diagram wearing eyepiece system that Fig. 3 provides for the embodiment of the present invention, This optical transfer function MTF be 10 lines under MTF.In figure, transverse axis represents the demand pairs of every millimeter, Dimensional units is lp/mm, and the longitudinal axis represents imaging picture element and reaches the percentage ratio of situation in kind, from 0 to 1, Optical transfer function MTF can with the image quality of concentrated expression system, its curve shape the most smooth and Transverse axis height the highest (i.e. closer to 1) relatively, the image quality of system is the best；Figure depicts respectively Picture element under 0.000mm to 34.70mm image height, from figure 3, it can be seen that the curve of transmission function More smoothing compact, the mtf value that curve is characterized is the highest, and the aberration of system has obtained good correction.
The curvature of field curve synoptic diagram wearing eyepiece system that Fig. 4 provides for the embodiment of the present invention, in Fig. 4 T line is meridianal curvature of field, and s line is the astigmatism that difference is system of Sagittal field curvature, meridianal curvature of field and Sagittal field curvature, The curvature of field and astigmatic influence the aberration of the outer field rays of system axle, difference cross conference serious have influence on system The image quality of off-axis ray.Figure 4, it is seen that the curvature of field of native system and astigmatism are all corrected to In very low range.
The distortion aberration curve synoptic diagram wearing eyepiece system that Fig. 5 provides for the embodiment of the present invention, distortion Not interfering with the definition of system, only can cause system diagram distortion of image, distortion can be processed by later image Solve.
The point range figure wearing eyepiece system that Fig. 6 provides for the embodiment of the present invention, point range figure be shown that be The disc of confusion that each field rays of system converges at image planes and formed, the system of characterizing obtains various difference Characteristic, the one-tenth picture element of RMS RADIUS (root mean square radii) the least proof system in point range figure It is the best to measure.In Fig. 6, three kinds of greyscale color represent the light of three kinds of wave bands respectively, and three kinds of greyscale color are more The aberration of the system of more making out a certificate that speckle divides is the biggest, and as can be seen from Figure 6 aberration has obtained good school Just.
The ratio chromatism, curve synoptic diagram wearing eyepiece system that Fig. 7 provides for the embodiment of the present invention, the longitudinal axis For the angle of visual field, transverse axis is the difference in height of relative green glow hot spot, and unit is μm.R-curve in figure and B Curve represent respectively HONGGUANG and blue light relative to green glow (green glow G line is the longitudinal axis in figure) in the throwing of image planes The difference penetrating difference in height, R-curve and B curve is the ratio chromatism, of system, relative to vertical in Fig. 7 On each position of axle, ratio chromatism, value is much smaller than 40 μm (5.5 inches of single Pixel Dimensions of 1440p screen It is 50 μm), illustrate that the aberration of native system obtains good correction.
In sum, the invention discloses one and wear eyepiece system and wear display device, described in wear Eyepiece system is by the most saturating to setting gradually first in the often group eyepiece between luminescent screen at light path diaphragm Mirror and the second minus lens, owing to this first plus lens has positive light coke, make light collection allow outside axle simultaneously Chief ray bends towards optical axis, and the second minus lens thereafter has negative focal power, can correct front a piece of just Residual aberration produced by lens and aberration, the combination of so positive minus lens can just reach one by aberration correction Individual reasonable picture quality, again can aberration correction while ensure that big visual angle.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the protection model of the present invention Enclose.All any modification, equivalent substitution and improvement etc. made within the spirit and principles in the present invention, all Comprise within the scope of the present invention.

Claims (9)

1. wear eyepiece system for one kind, it is characterised in that described in wear eyepiece system and include: luminescent screen Two groups of eyepieces with right and left eyes；Set gradually to often organizing eyepiece between described luminescent screen at light path diaphragm First plus lens and the second minus lens,
Described first plus lens has positive light coke, including being convex to the first surface of diaphragm and being convex to luminescent screen The second surface of curtain；
Described second minus lens has negative power, including concaving towards the 3rd surface of diaphragm and concaving towards luminescent screen 4th surface of curtain；
The described focal distance f wearing eyepiece system, the focal distance f of described first plus lens1, the second minus lens Focal distance f2Meet following relational expression:
f1＞ 0, f2＜ 0, f1+f2＜ 0,
The most according to claim 1 wear eyepiece system, it is characterised in that described in wear eyepiece system Overall length t of systemtl, the thickness t of described first plus lens1, the thickness t of the second minus lens2Meet following relational expression:
0.2 < t 1 f < 0.4 , 0.25 < t 1 t t l < 0.35 , 0.35 < t 1 + t 2 t t l < 0.45 ;
Wherein wear overall length t of eyepiece systemtlFor described first plus lens first surface and luminescent screen it Between distance.
The most according to claim 2 wear eyepiece system, it is characterised in that
The described focal length wearing eyepiece system is f=50mm, and the focal length of described first plus lens is f1=28mm, the focal length of the second minus lens is f2=-36mm；
The described overall length wearing eyepiece system is ttl=59mm, the thickness of described first plus lens is t1=18mm, the thickness of the second minus lens is t2=8mm.
4. according to wearing eyepiece system described in any one of claim 1-3, it is characterised in that described The first surface of one plus lens and second surface, the 3rd surface and the 4th surface of described second minus lens are equal For even aspheric surface.
5. according to wearing eyepiece system described in any one of claim 1-3, it is characterised in that described One plus lens and described second minus lens are plastic material；
The ranges of indices of refraction of described first plus lens is 1.4 ＜ n1＜ 1.6, dispersion range is 50 ＜ v1＜ 75；
The ranges of indices of refraction of described second minus lens is 1.55 ＜ n2＜ 1.8, dispersion range is 20 ＜ v2＜ 30.
6. according to wearing eyepiece system described in any one of claim 1-3, it is characterised in that described One plus lens is the plastic material of PMMA model, its refractive index n1=1.491786, dispersion v1=57.327362；
Described second minus lens is the glass material of H-LAK12 model, its refractive index n2=1.59, dispersion v2=29.9.
The most according to claim 1 wear eyepiece system, it is characterised in that
The described luminescent screen wearing eyepiece system is 1440P, 5.5 inches of Thin Film Transistor-LCDs TFT-LCD。
The most according to claim 7 wear eyepiece system, it is characterised in that described in wear eyepiece system The luminescent screen of system is divided into two sub-screens by split screen technology, shows the 2D corresponding to right and left eyes respectively Image or 3D rendering.
9. wear display device for one kind, it is characterised in that include the head described in any one of claim 1-8 Wear eyepiece system.
CN201510039387.6A 2015-01-26 2015-01-26 One is worn eyepiece system and wears display device Active CN104614851B (en)

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