CN112130324A - Near-to-eye display optical coupler and near-to-eye display optical system - Google Patents
Near-to-eye display optical coupler and near-to-eye display optical system Download PDFInfo
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- CN112130324A CN112130324A CN202010976112.6A CN202010976112A CN112130324A CN 112130324 A CN112130324 A CN 112130324A CN 202010976112 A CN202010976112 A CN 202010976112A CN 112130324 A CN112130324 A CN 112130324A
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- light
- prism
- eye display
- grating
- display optical
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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
Abstract
The invention discloses a near-eye display optical coupler, comprising: the optical waveguide is positioned between the grating and the prism; the prism is provided with a light incident surface for receiving light rays of the optical engine, the light rays penetrating through the light incident surface of the prism penetrate through the prism and the optical waveguide and irradiate the light receiving surface of the grating, and the light rays diffracted by the grating are perpendicular to the light receiving surface of the grating; through the structural improvement, the invention can reduce the dispersion phenomenon, improve the imaging quality and reduce the process complexity of the product structure, thereby reducing the production cost and improving the user experience.
Description
Technical Field
The invention relates to the technical field of waveguides, in particular to a near-eye display optical coupler and a near-eye display optical system.
Background
At present, optical waveguides are divided into a diffraction optical waveguide and an array optical waveguide, wherein both a light coupling-in part and a light coupling-out part of the diffraction optical waveguide adopt gratings (as shown in fig. 1), and the diffraction efficiencies of the gratings for light with different angles are different, so that the coupled light brightness in different directions is different, and further, the chromatic aberration phenomenon is caused;
in the prior art, a light coupling-in part of an array optical waveguide adopts a prism or a reflector, and a light coupling-out part of the array optical waveguide is composed of an array glass (see fig. 2), but the process of the array glass is quite complicated, and firstly, light splitting films with different light transmittance are respectively plated on a plurality of pieces of glass (the brightness of coupled light of each surface is ensured to be consistent); secondly, gluing the glass coated with the light splitting film into an array glass; thirdly, cutting the whole glass according to the designed angle; and finally, grinding and polishing. In order to prevent the coupled image from being double-imaged, the existing array optical waveguide product needs to ensure absolute parallelism (the angle is less than 30') among a plurality of array films, and the product has a complicated structure process, thereby resulting in higher cost.
Disclosure of Invention
The invention provides a near-eye display optical coupler and a near-eye display optical system, which can reduce the dispersion phenomenon through structural improvement, improve the imaging quality and simultaneously reduce the process complexity of the product structure, thereby improving the production cost and the user experience.
The embodiment of the invention provides a near-eye display optical coupler, which comprises: the optical waveguide is positioned between the grating and the prism;
the prism is provided with a light incident surface for receiving incident light, the light penetrating through the light incident surface of the prism penetrates through the prism and the optical waveguide and irradiates the light receiving surface of the grating, and the light diffracted by the grating is perpendicular to the light receiving surface of the grating.
Preferably, an upper surface of the prism is provided on a lower surface of the optical waveguide, and a light receiving surface of the grating is provided on an upper surface of the optical waveguide.
Preferably, the grating is located within the irradiation range of the light.
Preferably, the prism includes a first rhombic light guide portion and a second rectangular light guide portion integrally formed;
the light receiving surface of the first rhombic light guide part serves as the light entering surface of the prism, and the upper surface of the second rectangular light guide part serves as the upper surface of the prism.
Preferably, an upper surface of the second rectangular light guide portion is bonded to a lower surface of the light guide.
Preferably, an upper surface of the second rectangular light guide portion is bonded and connected to a lower surface of the light guide via a refractive index matching fluid.
Preferably, an upper surface of the second rectangular light guide portion is parallel to a light receiving surface of the grating.
Preferably, the prism and the optical waveguide are integrated.
Preferably, the light incident surface of the prism is inclined to the optical waveguide.
Correspondingly, the invention further provides a near-eye display optical system which comprises an optical machine and the near-eye display optical coupler.
By implementing the embodiment of the invention, the following beneficial effects are achieved:
the embodiment of the invention provides a near-eye display optical coupler and a near-eye display optical system, wherein the near-eye display optical coupler comprises a grating, an optical waveguide and a prism, compared with the existing diffraction optical waveguide and array optical waveguide, the structure of a light coupling-in part of the near-eye display optical coupler is the prism, and the light coupling-out part of the near-eye display optical coupler is the grating. In addition, the optical waveguide is positioned between the grating and the prism; the prism is provided with a light incoming surface for receiving incident light, and the light penetrating through the light incoming surface of the prism penetrates through the prism and the optical waveguide and irradiates the light receiving surface of the grating.
Drawings
FIG. 1 is a schematic diagram of the structure of a diffractive optical waveguide product;
FIG. 2 is a schematic diagram of the structure of an arrayed optical waveguide article;
FIG. 3 is a schematic diagram of a preferred embodiment of a near-eye display optical coupler according to the present invention;
fig. 4 is a schematic structural diagram of a preferred embodiment of a near-eye display optical system provided by the present invention.
Description of reference numerals: 1. a grating; 2. an optical waveguide; 3. a prism; 4. and (5) an optical machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a near-eye display optical coupler, which is shown in fig. 3 and is a schematic structural diagram of a preferred embodiment of the near-eye display optical coupler provided by the present invention, and the schematic structural diagram includes: the optical waveguide grating comprises a grating 1, an optical waveguide 2 and a prism 3, wherein the optical waveguide 2 is positioned between the grating 1 and the prism 3;
the prism 3 is provided with a light incident surface for receiving incident light, the light penetrating through the light incident surface of the prism 3 penetrates through the prism 3 and the optical waveguide 2 and irradiates the light receiving surface of the grating 1, and the light diffracted by the grating 1 is vertical to the light receiving surface of the grating 1.
In one preferred embodiment, the upper surface of the prism 3 is disposed on the lower surface of the optical waveguide 2, and the light receiving surface of the grating 1 is disposed on the upper surface of the optical waveguide 2.
In one preferred embodiment, the grating 1 is located within the irradiation range of the light.
In this embodiment, the grating 1 is located within the irradiation range of the light, so as to improve the utilization rate of the grating 1.
In one of the preferred embodiments, the prism 3 includes a first rhombic light guide portion and a second rectangular light guide portion integrally formed; the light receiving surface of the first rhombic light guide part serves as the light incident surface of the prism 3, and the upper surface of the second rectangular light guide part serves as the upper surface of the prism 3.
In one preferred embodiment, the upper surface of the second rectangular light guide portion is attached to the lower surface of the light guide 2.
In one preferred embodiment, the upper surface of the second rectangular light guide portion is bonded to the lower surface of the light guide 2 with an index matching fluid.
In one of the preferred embodiments, the prism 3 and the light guide 2 may be integral.
In a preferred embodiment, the upper surface of the second rectangular light guide portion is parallel to the light receiving surface of the grating 1, which is beneficial to make the light diffracted by the grating 1 perpendicular to the light receiving surface of the grating 1.
In one of the preferred embodiments, the grating 1 is a holographic grating or a surface relief grating.
In one of the preferred embodiments, the grating 1 is obtained by exposing a holographic plate with two coherent laser beams K1 and K2.
In one preferred embodiment, the light incident surface of the prism 3 is inclined to the optical waveguide 2, which is beneficial for the light passing through the incident surface of the prism 3 to pass through the prism 3 to reach the grating 1, further reducing the phenomenon that the light is totally internally reflected in the optical waveguide 2, and improving the imaging quality and the imaging efficiency. Referring to fig. 1 and 2, the light emitted from the optical machine 4 passes through the coupling end and is diffracted into a beam of light, and the angle of the beam of light satisfies the total reflection condition (θ > arcs i n (n)0/n1)，n1Is the refractive index of the waveguide, n0Is an air refractive index), diffracted light emitted after reaching the coupling-out end reaches the human eye,therefore, the invention reduces the reflection times, not only can improve the imaging quality of the image, but also can improve the imaging efficiency of the image.
As shown in fig. 4, on the basis of the above embodiments, the present invention correspondingly provides a near-eye display optical system, which includes an optical machine 4 and the near-eye display optical coupler according to any one of the above embodiments.
Therefore, the embodiment of the invention provides a near-eye display optical coupler and a near-eye display optical system, wherein the near-eye display optical coupler comprises a grating, an optical waveguide and a prism, compared with the existing diffraction optical waveguide and array optical waveguide, the structure of the light coupling-in part of the near-eye display optical coupler is the prism, the light coupling-out part of the near-eye display optical coupler is the grating, and through structural improvement, the dispersion phenomenon is reduced, the imaging quality is improved, and meanwhile, the process complexity of the product structure is reduced, so that the production cost is reduced, and the user experience is improved. In addition, the optical waveguide is positioned between the grating and the prism; the prism is provided with a light incoming surface for receiving incident light, and the light passing through the light incoming surface of the prism passes through the prism and the optical waveguide and irradiates the light receiving surface of the grating.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A near-eye display optical coupler, comprising: the optical waveguide is positioned between the grating and the prism;
the prism is provided with a light incident surface for receiving incident light, the light penetrating through the light incident surface of the prism penetrates through the prism and the optical waveguide and irradiates the light receiving surface of the grating, and the light diffracted by the grating is perpendicular to the light receiving surface of the grating.
2. The near-eye display optical coupler of claim 1 wherein the upper surface of the prism is disposed on the lower surface of the optical waveguide and the light-receiving surface of the grating is disposed on the upper surface of the optical waveguide.
3. The near-eye display optical coupler of claim 2 wherein the grating is located within an illumination range of the light.
4. The near-eye display optical coupler of claim 2 wherein the prism comprises a first diamond-shaped light guide portion and a second rectangular-shaped light guide portion integrally formed;
the light receiving surface of the first rhombic light guide part serves as the light entering surface of the prism, and the upper surface of the second rectangular light guide part serves as the upper surface of the prism.
5. The near-eye display optical coupler of claim 4, wherein an upper surface of the second rectangular light guide portion is in bonded connection with a lower surface of the light guide through an index matching fluid.
6. The near-eye display optical coupler of claim 5 wherein the upper surface of the second rectangular light guide portion is parallel to the light-receiving surface of the grating.
7. The near-eye display optical coupler of claim 1 wherein the prism is integral with the optical waveguide.
8. The near-eye display optical coupler of claim 1 wherein the light-entering surface of the prism is tilted with respect to the light guide.
9. A near-eye display optical system comprising an optical engine and the near-eye display optical coupler of any one of claims 1-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010976112.6A CN112130324A (en) | 2020-09-16 | 2020-09-16 | Near-to-eye display optical coupler and near-to-eye display optical system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010976112.6A CN112130324A (en) | 2020-09-16 | 2020-09-16 | Near-to-eye display optical coupler and near-to-eye display optical system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869406A (en) * | 2012-12-12 | 2014-06-18 | 泰勒斯公司 | Optical guide for collimated images with optical beam doubler, and associated optical device |
| CN205353457U (en) * | 2015-12-18 | 2016-06-29 | 上海理鑫光学科技有限公司 | Lens based on micro -structure formation of image |
| CN205450454U (en) * | 2016-03-07 | 2016-08-10 | 成都理想境界科技有限公司 | Near -to -eye display system and wear display device |
| CN106556929A (en) * | 2015-09-30 | 2017-04-05 | 中强光电股份有限公司 | Optical module and head-mounted display device |
| CN108738358A (en) * | 2017-02-22 | 2018-11-02 | 鲁姆斯有限公司 | Guide-lighting optical module |
| CN110927975A (en) * | 2019-12-20 | 2020-03-27 | 北京理工大学 | Waveguide display system and augmented reality glasses |
-
2020
- 2020-09-16 CN CN202010976112.6A patent/CN112130324A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869406A (en) * | 2012-12-12 | 2014-06-18 | 泰勒斯公司 | Optical guide for collimated images with optical beam doubler, and associated optical device |
| CN106556929A (en) * | 2015-09-30 | 2017-04-05 | 中强光电股份有限公司 | Optical module and head-mounted display device |
| CN205353457U (en) * | 2015-12-18 | 2016-06-29 | 上海理鑫光学科技有限公司 | Lens based on micro -structure formation of image |
| CN205450454U (en) * | 2016-03-07 | 2016-08-10 | 成都理想境界科技有限公司 | Near -to -eye display system and wear display device |
| CN108738358A (en) * | 2017-02-22 | 2018-11-02 | 鲁姆斯有限公司 | Guide-lighting optical module |
| CN110927975A (en) * | 2019-12-20 | 2020-03-27 | 北京理工大学 | Waveguide display system and augmented reality glasses |
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Application publication date: 20201225 |