CN106501943A - A kind of eyepiece optical system for wearing display device - Google Patents
A kind of eyepiece optical system for wearing display device Download PDFInfo
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- CN106501943A CN106501943A CN201710005763.9A CN201710005763A CN106501943A CN 106501943 A CN106501943 A CN 106501943A CN 201710005763 A CN201710005763 A CN 201710005763A CN 106501943 A CN106501943 A CN 106501943A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 40
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 7
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 5
- 210000001747 pupil Anatomy 0.000 claims description 5
- 239000011521 glass Substances 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000000007 visual effect Effects 0.000 abstract description 2
- 238000010191 image analysis Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 239000004417 polycarbonate Substances 0.000 description 5
- 230000004075 alteration Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
Classifications
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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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Abstract
The present invention discloses a kind of eyepiece optical system for wearing display device, it is adaptable to which screen size is 4.5 inches to 5.5 inches, display screen of the resolution ratio for 2k or 4k.The eyepiece system has very high image analysis ability, the high-resolution and DPI advantages of 4K screens, and up to 64 ° of the angle of visual field can not only be given full play to, silent frame is clear and is close to undistorted, ray tracing distance is greatly reduced the volume and weight of whole glasses less than 75mm.This eyepiece optical system for wearing display device, which includes：A piece of biconvex aspherical positive lens, the aspherical negative lens of a piece of concave-concave, lens barrel, display screen；The material of positive lens is optical grade PMMA, and the material of negative lens is optical grade PC, and positive negative lens is discretely located, and negative lens is near display screen end.
Description
Technical Field
The invention relates to the technical field of optical design, in particular to an eyepiece optical system of a head-mounted display device.
Background
In recent years, as VR and AR head-mounted display devices return to capital and consumer markets, hardware and software development technologies related to the VR and AR head-mounted display devices are becoming mature. The optical eyepiece system is used as a structure which can most visually reflect the performance of equipment at a hardware end, and the experience of a consumer is directly determined by the advancement of the technology. At present, a plurality of VR wide-angle glasses are continuously promoted by Oculus, HTC and Samsung internationally, and domestic 3Glass, storm, museum and ant are followed. However, all VR glasses mentioned above basically use the same optical eyepiece solution, i.e. a single aspheric surface or a single fresnel lens. The single-chip aspheric surface or more advanced single-chip fresnel lens has the problems of blurred edge field of view, serious dispersion/distortion and too close image to human eyes. Although VR manufacturers generally correct the above problems by optimizing the hardware bottom layer and combining various algorithms, the correction scheme not only increases the design complexity of the hardware bottom layer, but also has limited improvement on the optical effect.
Oculus optimizes an optical eyepiece in CV1 glasses introduced in the year, adopts an eyepiece with a coupling of an aspheric surface and a Fresnel plane, solves the problems of serious chromatic dispersion and distortion to a great extent, but still does not perfectly solve the problems of blurred edge field and too close image to human eyes. In addition, a pair of glasses for main shooting and viewing experience is developed by storm wind, but the glasses are small in field angle, low in resolution and too long in light ray tracing distance of an eyepiece system, and the glasses cannot be promoted to achieve high-definition and extremely-good viewing effect.
And along with the promotion of 4K resolution ratio high definition display screen, put forward higher optical resolution ratio requirement to the eyepiece system of wear-type display device.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the shortcomings of the prior art are overcome, an eyepiece optical system of head-mounted display equipment is provided, the eyepiece optical system is suitable for a display screen with the screen size of 4.5 inches to 5.5 inches, the resolution ratio is 2K or 4K, the eyepiece optical system has high image resolution capability, the high resolution ratio and DPI advantage of the 4K display screen can be fully played, the field angle is up to 64 degrees, the whole picture is clear and close to no distortion, the ray tracing distance is less than 75mm, and the size and the weight of the whole glasses are greatly reduced.
The technical solution of the invention is as follows: an eyepiece optical system of such a head-mounted display device includes: a biconvex aspheric positive lens, a biconcave aspheric negative lens, a lens cone and a display screen; the positive lens is made of optical-grade PMMA, the negative lens is made of optical-grade PC, the positive lens and the negative lens are separately arranged, and the negative lens is close to the display screen end.
Since the eyepiece optical system of the head-mounted display device includes: a biconvex aspheric positive lens and a biconcave aspheric negative lens; the positive lens is made of PMMA (polymethyl methacrylate), the negative lens is made of PC (polycarbonate), the positive lens and the negative lens are separately arranged, and the negative lens is close to the end of the display screen; the positive lens has the function of converging imaging light beams to realize a large field angle; the negative lens is used for shortening the light ray tracing path, compensating dispersion and correcting curvature of field and distortion; the aspheric surface is used for correcting various aberrations caused by large aperture and large field angle, and extremely high optical resolution is realized; therefore, the advantages of high resolution and DPI of the 4K display screen can be fully exerted, the field angle is as high as 64 degrees, the whole picture is clear and nearly undistorted, the ray tracing distance is less than 75mm, and the size and the weight of the whole glasses are greatly reduced.
Drawings
Fig. 1 is a schematic configuration diagram of an eyepiece optical system (monocular) of a head mounted display device according to the present invention.
FIG. 2 is a schematic ray trace of an eyepiece optical system (monocular) of a head mounted display device according to the present invention;
fig. 3 is a field curvature/distortion diagram of an eyepiece optical system of a head mounted display device according to the present invention.
Fig. 4 is an aberration curve diagram of an eyepiece optical system of a head mounted display device according to the present invention.
Fig. 5 is a schematic diagram of a dispersion curve of an eyepiece optical system of a head-mounted display device according to the present invention.
Fig. 6 is a dot-column diagram of an eyepiece optical system of a head-mounted display device according to the present invention.
Detailed Description
As shown in fig. 1, the eyepiece optical system of such a head-mounted display device includes, from left to right: a biconvex aspheric positive lens, a biconcave aspheric negative lens, a lens cone and a display screen; the positive lens is made of optical-grade PMMA, the negative lens is made of optical-grade PC, and the positive lens and the negative lens are placed separately.
Since the eyepiece optical system of the head-mounted display device includes: a biconvex aspheric positive lens, a biconcave aspheric negative lens, a lens cone and a display screen; the positive lens is made of optical PMMA, the negative lens is made of optical PC, the positive lens and the negative lens are separately arranged, and the negative lens is close to the end of the display screen; the positive lens has the function of converging imaging light beams to realize a large field angle; the negative lens is used for shortening the light ray tracing path, compensating dispersion and correcting curvature of field and distortion; the aspheric surface is used for correcting various aberrations caused by large aperture and large field angle, and extremely high optical resolution is realized; therefore, the advantages of high resolution and DPI of the 4K display screen can be fully exerted, the field angle is as high as 64 degrees, the whole picture is clear and nearly undistorted, the ray tracing distance is less than 75mm, and the size and the weight of the whole glasses are greatly reduced.
Preferably, as shown in table 1, the eyepiece optical system parameters of the head-mounted display device are 60mm in focal length, 64 ° in field angle, 8mm in exit pupil diameter, and 20mm in exit pupil distance.
TABLE 1
Preferably, as shown in table 2, the first surface curvature of the positive lens is 0.016211mm according to the structural parameters of the eyepiece system of the head-mounted display device-1Concic is 0.0285, and the spacing from the second face of the positive lens is 12.3238 mm; the second surface curvature of the positive lens is-0.043304 mm-1Conic is-1.8613, spaced 20.0237mm from the first face of the negative lens; the curvature of the first surface of the negative lens is-0.039718 mm-1Conic is-0.4368, and the spacing from the second face of the negative lens is 2.5 mm; the second surface curvature of the negative lens is 0.012824mm-1And Conic is-0.4775, and the distance from the display screen is 20.246 mm.
TABLE 2
Note: the aspherical coefficients of the positive and negative lenses are not given in table 2;
preferably, the eyepiece optical system of the head-mounted display device employs a 4K 5.5 "TFT LCD screen.
The present invention is described in more detail below.
The optical parameters of the eyepiece lens related to the invention are shown in table 1:
the positive lens bears the primary diopter, and the calculation formula is as follows (in air):
wherein,is the lens diopter, n lens material refractive index, ρ1，ρ2The curvatures of the front and rear surfaces of the lens respectively, and d is the central thickness of the lens;
the diopter calculation formula of the negative lens is the same as that of the positive lens;
the total diopter of the two separate lenses is:
wherein,is the total diopter of the two lenses,diopters of the first lens and the second lens are respectively, and d is the interval between the lenses;
the focal length of the eyepiece system is:
wherein f is the focal length of the eyepiece system,is the total diopter of the ocular system;
the field angle of the eyepiece system is:
wherein 2 theta is the field angle of the eyepiece system, y is the image surface height of the eyepiece system, and f is the focal length of the eyepiece system;
when the size of the display screen is determined, the image surface height y is immediately determined, and the focal length and the total diopter of the eyepiece system are calculated through the formula;
for the split double thin lens, the achromatization conditions are:
wherein h is1，h2Is the height at which light is incident on the lens surface; v. of1，v2Abbe numbers of the positive lens and the negative lens respectively,the diopters of the positive lens and the negative lens respectively;
for eyepiece systems, h1Is determined, h2Is determined by the following formula:
another expression for the total diopter of the ocular system is:
for eyepiece systems, the abbe number v of the positive and negative lenses is selected1，v2Then determining; determining total diopter according to visual angle required by eyepiece systemThe three formulas (5), (6) and (7) are combined to determine the sequenceAnd h2(ii) a Most preferablyThen, the initial structural parameters of each lens are determined according to formula (1).
And inputting the initial structural parameters into optical imaging simulation software, setting the surface shapes of the positive lens and the negative lens as even-order aspheric surface shapes, optimizing according to an aberration optimization theory, and finally determining all structural parameters of the eyepiece system.
The even aspheric surface type formula is as follows:
wherein z is rise of aspheric target point, Y is radial radius of target point, R is reference spherical radius, k is aspheric quadratic coefficient, Ai(i ═ 2, 4, 6, … 16) are aspheric coefficients of order i; the relative distortion of the eyepiece system is:
wherein q is the relative distortion of the ocular system, Y is the actual image height, and Y is the ideal image height;
the light ray tracing distance of the ocular lens system is as follows:
L＝P1-P0formula (10)
Wherein L is the light tracking distance of the ocular lens system, P1Is the image plane position, P0Is the entrance pupil position;
the large-field-angle short-range tracing eyepiece lens for ultrahigh resolution display is designed, the field angle reaches 64 degrees, namely a large screen of about 1000 inches is watched at a distance of 20m, full-frame high-definition display is realized, zero distortion is approached, and the light tracing distance of an eyepiece system is about 75mm, so that the whole structure of the glasses is compact, the gravity center is close to human eyes, and the wearing comfort degree and the attractiveness are improved.
There are three technical solutions that may achieve the same object:
1) on the basis of the ocular structure, the invention modifies the lens material, or slightly changes the surface type parameters of the lens, or slightly adjusts the interval between the lenses.
2) On the basis of the ocular structure, a certain aspheric surface shape is modified into a Fresnel surface shape, and the surface shape parameters of the rest surfaces and the intervals between the lenses are optimized properly.
3) A single-chip free-form surface lens is adopted, or on the basis of the ocular structure related by the invention, a certain aspheric surface shape is modified into a free-form surface shape, and the surface shape parameters of the rest surfaces and the interval between the lenses are optimized properly.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (5)
1. An eyepiece optical system of a head-mounted display device, characterized in that: it includes: a biconvex aspheric positive lens, a biconcave aspheric negative lens, a lens cone and a display screen; the positive lens is made of optical-grade PMMA, the negative lens is made of optical-grade PC, the positive lens and the negative lens are separately arranged, and the negative lens is close to the display screen end.
2. The eyepiece optical system of the head-mounted display device according to claim 1, wherein: the focal length of an eyepiece optical system of the head-mounted display device is 60mm, the field angle is 64 degrees, the diameter of an exit pupil is 8mm, and the distance of the exit pupil is 20 mm.
3. The eyepiece optical system of the head-mounted display device according to claim 2, wherein: the curvature of the first surface of the positive lens is 0.016211mm-1Concic is 0.0285, and the spacing from the second face of the positive lens is 12.3238 mm; the second surface curvature of the positive lens is-0.043304 mm-1Coni c is-1.8613, spaced 20.0237mm from the first face of the negative lens; the curvature of the first surface of the negative lens is-0.039718 mm-1Conic is-0.4368, and the spacing from the second face of the negative lens is 2.5 mm; the second surface curvature of the negative lens is 0.012824mm-1Conic is-0.4775, and the distance from the display screen is 20.246 mm.
4. The eyepiece optical system of the head mounted display device of claim 1, comprising a display screen size of 5.5 inches, a resolution of 4K, and a material of TFT LCD.
5. The eyepiece optical system of the head-mounted display device according to claim 4, wherein: the eyepiece optical system of the head-mounted display device is suitable for a display screen with the size of 4.5 inches to 5.5 inches and the resolution of 2k or 4 k.
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| CN201710005763.9A CN106501943B (en) | 2017-01-05 | 2017-01-05 | A kind of eyepiece optical system for wearing display equipment |
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| CN201710005763.9A CN106501943B (en) | 2017-01-05 | 2017-01-05 | A kind of eyepiece optical system for wearing display equipment |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109143570A (en) * | 2017-06-15 | 2019-01-04 | 北京海鲸科技有限公司 | A kind of eyepiece and wear display equipment |
| CN109375364A (en) * | 2018-12-26 | 2019-02-22 | 杭州有人光电技术有限公司 | A kind of 2K eyepiece optical system of virtual reality device |
| WO2019080325A1 (en) * | 2017-10-24 | 2019-05-02 | 歌尔科技有限公司 | Eyepiece and head mounted display device |
| CN110727101A (en) * | 2018-07-16 | 2020-01-24 | 玉晶光电股份有限公司 | Eyepiece optical system |
| WO2020026749A1 (en) * | 2018-07-31 | 2020-02-06 | ソニー株式会社 | Display device |
| JP2020024363A (en) * | 2018-07-31 | 2020-02-13 | ソニー株式会社 | Display device |
| WO2020133619A1 (en) * | 2018-12-26 | 2020-07-02 | 广东思锐光学股份有限公司 | External lens for mobile terminal |
| CN111494829A (en) * | 2019-06-26 | 2020-08-07 | 众安仕（北京）科技有限公司 | AR fire control face guard and use its AR fire control auxiliary display system |
| CN111699428A (en) * | 2019-06-26 | 2020-09-22 | 深圳市大疆创新科技有限公司 | Optical lens group, imaging system and wearable display device |
| CN115097614A (en) * | 2022-08-24 | 2022-09-23 | 江西联昊光电有限公司 | Optical system and VR equipment |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109143570A (en) * | 2017-06-15 | 2019-01-04 | 北京海鲸科技有限公司 | A kind of eyepiece and wear display equipment |
| US10928634B2 (en) | 2017-10-24 | 2021-02-23 | Goertek Technology Co., Ltd. | Eyepiece and head-mounted display device |
| WO2019080325A1 (en) * | 2017-10-24 | 2019-05-02 | 歌尔科技有限公司 | Eyepiece and head mounted display device |
| JP2020500318A (en) * | 2017-10-24 | 2020-01-09 | 歌爾科技有限公司ＧｏｅｒＴｅｋ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．， Ｌｔｄ． | Eyepiece and head mounted display |
| CN110727101A (en) * | 2018-07-16 | 2020-01-24 | 玉晶光电股份有限公司 | Eyepiece optical system |
| JP2020024363A (en) * | 2018-07-31 | 2020-02-13 | ソニー株式会社 | Display device |
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| JP7215220B2 (en) | 2018-07-31 | 2023-01-31 | ソニーグループ株式会社 | Display device |
| WO2020133619A1 (en) * | 2018-12-26 | 2020-07-02 | 广东思锐光学股份有限公司 | External lens for mobile terminal |
| CN109375364A (en) * | 2018-12-26 | 2019-02-22 | 杭州有人光电技术有限公司 | A kind of 2K eyepiece optical system of virtual reality device |
| CN111494829A (en) * | 2019-06-26 | 2020-08-07 | 众安仕（北京）科技有限公司 | AR fire control face guard and use its AR fire control auxiliary display system |
| CN111699428A (en) * | 2019-06-26 | 2020-09-22 | 深圳市大疆创新科技有限公司 | Optical lens group, imaging system and wearable display device |
| WO2020258063A1 (en) * | 2019-06-26 | 2020-12-30 | 深圳市大疆创新科技有限公司 | Optical lens group, imaging system, and wearable display device |
| CN115097614A (en) * | 2022-08-24 | 2022-09-23 | 江西联昊光电有限公司 | Optical system and VR equipment |
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