CN111258053B - Eyepiece lens and near-to-eye display system - Google Patents
Eyepiece lens and near-to-eye display system Download PDFInfo
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- CN111258053B CN111258053B CN202010179976.5A CN202010179976A CN111258053B CN 111258053 B CN111258053 B CN 111258053B CN 202010179976 A CN202010179976 A CN 202010179976A CN 111258053 B CN111258053 B CN 111258053B
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- eyepiece
- eyepiece lens
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- 230000003287 optical effect Effects 0.000 claims description 52
- 210000001747 pupil Anatomy 0.000 claims description 8
- 239000005357 flat glass Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 239000005304 optical glass Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 230000004075 alteration Effects 0.000 description 2
- 230000003190 augmentative effect Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 210000001525 retina Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
Abstract
The embodiment of the invention relates to the technical field of optics, and discloses an eyepiece lens and a near-eye display system, wherein the eyepiece lens comprises the following components in sequence from an image side to an object side: the eyepiece lens provided by the embodiment of the invention has the advantages of smaller volume, better portability, clear imaging and high compatibility.
Description
Technical Field
The embodiment of the invention relates to the technical field of optics, in particular to an eyepiece lens and a near-eye display system.
Background
The head-mounted display for augmented reality adopts a near-to-eye display technology, people can watch virtual images being projected while looking at surrounding environments, the virtual images are overlapped on the real world perceived by the user, more lifelike experience can be built, and the user immersion feeling is stronger.
In the process of implementing the embodiments of the present invention, the inventors found that at least the following problems exist in the above related art: the existing near-to-eye display equipment for augmented reality generally adopts an off-axis aspheric surface to form a catadioptric system to realize large-field-angle viewing, and the system generally generates large vertical axis aberration, field curvature and distortion, so that a virtual picture is deformed, the user experience is affected, and the system is large in size and poor in portability.
Disclosure of Invention
In view of the foregoing drawbacks of the prior art, an object of an embodiment of the present invention is to provide an eyepiece lens and a near-to-eye display system that are small in size and clear in imaging.
The aim of the embodiment of the invention is realized by the following technical scheme:
in order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides an eyepiece lens, including:
a first lens having positive optical power, the first lens being a convex-concave lens having a convex surface near the image side and a concave surface near the object side;
a second lens having positive optical power, the second lens being a convex-concave lens, a convex surface of which is close to the first lens, and a concave surface of which is close to the object side;
a third lens with negative focal power, wherein the third lens is a convex-concave lens, the convex surface of the third lens is close to the second lens, and the concave surface of the third lens is close to the object side;
a fourth lens having positive optical power, the fourth lens being a biconvex lens;
a fifth lens with positive focal power, wherein the fifth lens is a convex-concave lens, the convex surface of the fifth lens is close to the fourth lens, and the concave surface of the fifth lens is close to the object side;
and the flat glass is arranged on one side of the concave surface of the fifth lens.
In some embodiments, the first lens is an even aspherical lens, and the second lens, the third lens, the fourth lens, and the fifth lens are spherical lenses.
In some embodiments, the materials of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are optical glass or optical resin.
In some embodiments, the eyepiece lens has an effective focal length of 14.5mm.
In some embodiments, the eyepiece lens has an exit pupil distance of 18mm or greater.
In some embodiments, the eyepiece lens has a diagonal full field angle of 40 °.
In some embodiments, the eyepiece lens has an exit pupil diameter of 4mm or greater.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a near-eye display system, including: the eyepiece lens according to the first aspect is disposed in a light emitting direction of the display chip and is coaxial with the display chip, and the optical waveguide is disposed in the light emitting direction of the eyepiece lens.
In some embodiments, the optical waveguide is a geometric array optical waveguide that includes an incident prism sheet disposed in an exit direction of the eyepiece lens.
In some embodiments, the optical waveguide is a grating optical waveguide that includes an in-coupling grating surface disposed in an exit direction of the eyepiece lens.
Compared with the prior art, the invention has the beneficial effects that: in contrast to the situation in the prior art, in the embodiment of the present invention, an eyepiece lens and a near-eye display system are provided, where the eyepiece lens includes, in order from an image side to an object side, a common optical axis: the eyepiece lens provided by the embodiment of the invention has the advantages of smaller volume, better portability, clear imaging and high compatibility.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements/modules and steps, and in which the figures do not include the true to scale unless expressly indicated by the contrary reference numerals.
Fig. 1 is a schematic optical structure of an eyepiece lens according to an embodiment of the present invention;
FIG. 2 is a graph showing the MTF values of the full field transfer function of an eyepiece lens according to an embodiment of the present invention at a resolution of 30 lp/mm;
FIG. 3 is a graph of field curvature and distortion for a full field of view and full band of an eyepiece lens provided by an embodiment of the present invention;
FIG. 4 is a point-to-point diagram of a full field of view of an eyepiece lens provided by an embodiment of the invention;
FIG. 5 is a schematic diagram of an optical structure of a near-eye display system according to an embodiment of the present invention;
fig. 6 is a schematic optical structure diagram of another near-eye display system according to an embodiment of the invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Moreover, the words "first," "second," "third," and the like as used herein do not limit the data and order of execution, but merely distinguish between identical or similar items that have substantially the same function and effect.
In order to facilitate the definition of the connection structure, the invention performs the position definition of the component by taking the light path advancing/emergent direction of the optical axis as a reference.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In particular, embodiments of the present invention are further described below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, an optical structure of an eyepiece lens according to an embodiment of the present invention is shown, where the eyepiece lens includes, in order from an image side to an object side, a common optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a plate glass E6.
The first lens E1 has positive optical power, the first lens E1 is a convex-concave lens, a convex surface S1 thereof is close to the image side, and a concave surface S2 thereof is close to the object side.
The second lens E2 has positive optical power, the second lens E2 is a convex-concave lens, a convex surface S3 thereof is close to the first lens E1, and a concave surface S4 thereof is close to the object side and the third lens E3.
The third lens E3 has negative optical power, the third lens E3 is a convex-concave lens, a convex surface S5 thereof is close to the second lens E2, and a concave surface S6 thereof is close to the object side and the fourth lens E4.
The fourth lens E4 has positive optical power, the fourth lens E4 is a biconvex lens, its convex surface S7 is close to the third lens E3, and its convex surface S8 is close to the object side and the fifth lens E5.
The fifth lens E5 has positive optical power, the fifth lens E5 is a convex-concave lens, a convex surface S9 thereof is adjacent to the fourth lens E4, and a concave surface S10 thereof is adjacent to the object side and the plate glass E6.
The plate glass E6 is disposed on one side of the concave surface S10 of the fifth lens E5.
In the embodiment of the present invention, the first lens E1 is an even aspherical lens, and the second lens E2, the third lens E3, the fourth lens E4 and the fifth lens E5 are spherical lenses.
In an embodiment of the present invention, the materials of the first lens E1, the second lens E2, the third lens E3, the fourth lens E4 and the fifth lens E5 are optical glass or optical resin.
Specifically, as shown in the following table, a set of practical design parameters of the eyepiece lens according to the embodiment of the invention is provided, and under the design parameters, the effective focal length EFFL of the eyepiece lens according to the embodiment of the invention is 14.5mm. The exit pupil distance EDP of the eyepiece lens is more than or equal to 18mm. The eyepiece lens has a diagonal full field angle FOV of 40 °. The diameter of the exit pupil of the eyepiece lens is more than or equal to 4mm.
TABLE 1
The surface numbers 1 to 12 in the above table 1 are the surface numbers S1 to S12 shown in fig. 1, and the curvature radius, center thickness, focal length, exit pupil diameter, and exit pupil distance units in the above table 1 are all millimeters (mm).
Based on the eyepiece lens shown in fig. 1 and the actual design parameters of the eyepiece lens shown in table 1, an imaging quality diagram of the eyepiece lens in a full-view field and full-band can be obtained, wherein the system of the eyepiece lens shown in fig. 2 to 4 is shown. In particular, the method comprises the steps of,
FIG. 2 is a schematic diagram of the MTF value of the full-field optical modulation transfer function of the eyepiece lens provided by the embodiment of the invention at the resolution of 30lp/mm, and the MTF of the full-field optical modulation transfer function of the eyepiece lens is more than or equal to 30% at the spatial frequency of 30lp/mm as shown in the figure.
Fig. 3 is a field curvature and distortion diagram of a full field of view and a full band of a full field of view of an eyepiece lens according to an embodiment of the present invention, wherein the left side is the field curvature diagram, the right side is the distortion diagram, and as shown in the drawing, the field curvature of the eyepiece lens is controlled within <0.1mm, and the optical distortion is controlled to be less than or equal to 4%.
Fig. 4 is a point-to-point plot of the full field of view of an eyepiece lens provided by an embodiment of the invention as shown with RMS radius control at <7 μm.
The eyepiece lens provided by the embodiment of the invention has the advantages of small number of lenses, short total length of optics, small volume, light weight and portability. The eyepiece lens has small optical aberration on an optical imaging hand, low distortion, clear imaging and high resolution. The eyepiece lens can also be used for coupling with a geometric array optical waveguide prism sheet or a grating optical waveguide sheet, and has high compatibility.
Example two
An embodiment of the present invention provides a near-eye display system, please refer to fig. 5, which illustrates an optical structure of the near-eye display system, wherein 1 is a geometric array optical waveguide, and 2 is a human eye model. The near-eye display system includes: the eyepiece lens according to the first embodiment is disposed in a light emitting direction of the display chip and is coaxial with the display chip, and the optical waveguide is disposed in the light emitting direction of the eyepiece lens.
In an embodiment of the present invention, the optical waveguide is a geometric array optical waveguide, and the geometric array optical waveguide includes an incident prism lens, where the incident prism lens is disposed in a light emitting direction of the eyepiece lens.
In some embodiments, please refer to fig. 6, which illustrates an optical structure of another near-eye display system provided in an embodiment of the present invention, wherein 3 is a grating light waveguide, 4 is a coupling-in grating surface on the grating light waveguide, and 5 is a coupling-out grating surface of the grating light waveguide. The optical structure of the near-eye display system is different from that of the near-eye display system shown in fig. 5 in that: the optical waveguide is a grating optical waveguide and comprises a coupling-in grating surface, and the coupling-in grating surface is arranged in the light emitting direction of the eyepiece lens.
The display chip includes, but is not limited to, one of LCD, OLED, LCOS, DMD, micro-LED or the like, which is capable of converting an image into a light wave, exiting to the eyepiece lens, and entering into the eyepiece lens from the side of the plate glass S12 of the eyepiece lens. The display chip is 0.2 inch to 0.7 inch, preferably, a 0.23 inch OLED chip, or a 0.39 inch LCOS chip is adopted.
It should be noted that, the eyepiece lens according to the embodiment of the present invention has the same structure and characteristics as those of the eyepiece lens according to the first embodiment, and will not be described in detail herein.
In the embodiment of the invention, the object light emitted from the display screen after being processed and converted passes through the eyepiece lens according to the first embodiment and emits a parallel light beam, the parallel light beam enters the geometric array optical waveguide shown in fig. 5 or the grating optical waveguide shown in fig. 6, then is totally reflected and propagated in the substrate of the optical waveguide, finally is coupled and emitted through the geometric array optical waveguide prism sheet or the coupling-out grating surface, and the emitted parallel light beam enters the human eye, so that a virtual image is formed in the retina of the human eye.
The embodiment of the invention provides an eyepiece lens and a near-eye display system, wherein the eyepiece lens comprises the following components in sequence from an image side to an object side: the eyepiece lens provided by the embodiment of the invention has the advantages of smaller volume, better portability, clear imaging and high compatibility.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. An eyepiece lens, characterized in that, applied to a near-eye display system, the effective focal length of the eyepiece lens is 14.5mm, the diagonal full field angle of the eyepiece lens is 40 °, and the eyepiece lens comprises the following components in order from an image side to an object side:
a first lens having positive optical power, the first lens being a convex-concave lens having a convex surface near the image side and a concave surface near the object side;
a second lens having positive optical power, the second lens being a convex-concave lens, a convex surface of which is close to the first lens, and a concave surface of which is close to the object side;
a third lens with negative focal power, wherein the third lens is a convex-concave lens, the convex surface of the third lens is close to the second lens, and the concave surface of the third lens is close to the object side;
a fourth lens having positive optical power, the fourth lens being a biconvex lens;
a fifth lens with positive focal power, wherein the fifth lens is a convex-concave lens, the convex surface of the fifth lens is close to the fourth lens, and the concave surface of the fifth lens is close to the object side;
a plate glass provided on one side of the concave surface of the fifth lens; wherein,
the first lens is an even aspherical lens, and the second lens, the third lens, the fourth lens and the fifth lens are spherical lenses.
2. The eyepiece lens of claim 1 wherein the eyepiece lens is configured to,
the materials of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are optical glass or optical resin.
3. Eyepiece lens according to claim 1 or 2, characterized in that,
the exit pupil distance of the eyepiece lens is more than or equal to 18mm.
4. Eyepiece lens according to claim 1 or 2, characterized in that,
the diameter of the exit pupil of the eyepiece lens is more than or equal to 4mm.
5. A near-eye display system, comprising: a display chip and an optical waveguide, and an eyepiece lens according to any one of claims 1-4, wherein the eyepiece lens is arranged in the light emitting direction of the display chip and is coaxial with the display chip, and the optical waveguide is arranged in the light emitting direction of the eyepiece lens.
6. The near-eye display system of claim 5 wherein,
the optical waveguide is a geometric array optical waveguide and comprises an incident prism sheet, wherein the incident prism sheet is arranged in the light emitting direction of the eyepiece lens.
7. The near-eye display system of claim 5 wherein,
the optical waveguide is a grating optical waveguide and comprises a coupling-in grating surface, and the coupling-in grating surface is arranged in the light emitting direction of the eyepiece lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010179976.5A CN111258053B (en) | 2020-03-16 | 2020-03-16 | Eyepiece lens and near-to-eye display system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010179976.5A CN111258053B (en) | 2020-03-16 | 2020-03-16 | Eyepiece lens and near-to-eye display system |
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| Publication Number | Publication Date |
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| CN111258053A CN111258053A (en) | 2020-06-09 |
| CN111258053B true CN111258053B (en) | 2024-03-26 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111694147B (en) * | 2020-06-24 | 2023-12-08 | 深圳珑璟光电科技有限公司 | Eyepiece lens and eyepiece optical system |
| WO2022078025A1 (en) * | 2020-10-14 | 2022-04-21 | Oppo广东移动通信有限公司 | Lens, projection optical machine, and near-eye display system |
| CN113568141B (en) * | 2021-07-16 | 2022-10-21 | Oppo广东移动通信有限公司 | Lens, projection optical machine and near-to-eye display equipment |
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| CN104820282A (en) * | 2014-10-13 | 2015-08-05 | 山东北方光学电子有限公司 | Single-display-shared large-exit-pupil binocular eyepiece optical system |
| CN109116548A (en) * | 2018-11-02 | 2019-01-01 | 杭州有人光电技术有限公司 | A kind of eyepiece optical system |
| CN208689247U (en) * | 2018-08-31 | 2019-04-02 | 广景视睿科技（深圳）有限公司 | A kind of Miniature projection lens and the nearly eye display device of waveguide |
| CN110426838A (en) * | 2019-07-29 | 2019-11-08 | 深圳纳德光学有限公司 | A kind of eyepiece optical system and head-mounted display |
| CN211627938U (en) * | 2020-03-16 | 2020-10-02 | 深圳珑璟光电科技有限公司 | Eyepiece lens and near-to-eye display system |
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2020
- 2020-03-16 CN CN202010179976.5A patent/CN111258053B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820282A (en) * | 2014-10-13 | 2015-08-05 | 山东北方光学电子有限公司 | Single-display-shared large-exit-pupil binocular eyepiece optical system |
| CN208689247U (en) * | 2018-08-31 | 2019-04-02 | 广景视睿科技（深圳）有限公司 | A kind of Miniature projection lens and the nearly eye display device of waveguide |
| CN109116548A (en) * | 2018-11-02 | 2019-01-01 | 杭州有人光电技术有限公司 | A kind of eyepiece optical system |
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