CN108627910B - Optical waveguide device - Google Patents
Optical waveguide device Download PDFInfo
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- CN108627910B CN108627910B CN201810463667.3A CN201810463667A CN108627910B CN 108627910 B CN108627910 B CN 108627910B CN 201810463667 A CN201810463667 A CN 201810463667A CN 108627910 B CN108627910 B CN 108627910B
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- refractive index
- light wave
- optical waveguide
- index material
- coupling
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- 230000003287 optical effect Effects 0.000 title claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 38
- 230000008878 coupling Effects 0.000 claims abstract description 37
- 238000010168 coupling process Methods 0.000 claims abstract description 37
- 238000005859 coupling reaction Methods 0.000 claims abstract description 37
- 239000000758 substrate Substances 0.000 claims abstract description 30
- 238000005286 illumination Methods 0.000 claims description 6
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Optical Integrated Circuits (AREA)
Abstract
The invention discloses an optical waveguide device, which comprises a waveguide substrate, an optical wave output part and a coupling reflecting surface; reflecting the input light waves into the waveguide substrate through the coupling reflecting surface; transmitting the light wave reflected by the coupling reflecting surface to the light wave output part in a total reflection mode through the waveguide substrate; the structure of the light wave output part comprises a microstructure obtained by matching a low refractive index material and a high refractive index material in a sawtooth shape; and the light wave transmitted to the light wave output part is output through the microstructure, so that the problem that the geometrical light waveguide easily forms a wedge angle due to a cementing layer, and stray light is generated at the cementing line due to scattering and diffraction effects is avoided, and the requirement of a large field of view during near-to-eye display is met.
Description
Technical Field
The present invention relates to the field of optical transmission, and in particular, to an optical waveguide device.
Background
The conventional geometric optical waveguide, for example, uses a laminated array semipermeable membrane optical waveguide to realize light transmission and light guiding in a waveguide sheet, uses a plate-shaped optical waveguide sheet to realize light transmission, uses a matrix type miniature prism group bonded on the plate-shaped waveguide sheet to realize light guiding, has high requirements on processing technology, is easy to form a wedge angle due to a bonding layer, generates stray light due to scattering and diffraction effects at a bonding line, and does not meet the requirement of a large field of view in near-to-eye display.
Disclosure of Invention
The invention aims to provide an optical waveguide device, so as to avoid the problem of stray light caused by scattering and diffraction effects and meet the requirement of a large field of view in near-eye display.
In order to achieve the above object, the present invention provides the following solutions:
an optical waveguide device, the optical waveguide device comprising: a waveguide substrate, an optical wave output section, and a coupling reflection surface;
the coupling reflecting surface is arranged at the light wave input position of the waveguide substrate and is used for reflecting the input light wave into the waveguide substrate;
the light wave output part is arranged at the output position of the waveguide substrate; the waveguide substrate is used for transmitting the light waves reflected by the coupling reflection surface to the light wave output part in a total reflection mode;
the light wave output part comprises a microstructure obtained by matching a low refractive index material and a high refractive index material in a sawtooth shape; the microstructure is used for outputting the light waves transmitted to the light wave output part.
Optionally, the coupling reflection angle of the coupling reflection surfaceThe range of the values is as follows:
wherein n is 1 Is the refractive index of the low refractive index material, n 2 The refractive index of the high refractive index material, θ, is the maximum incident angle of the optical waveguide.
Optionally, the right angle γ of the microstructure has a value range:
wherein n is 1 Is the refractive index of the low refractive index material, n 2 The refractive index of the high refractive index material, θ, is the maximum incident angle of the optical waveguide.
Optionally, the left angle β of the microstructure has a value of:wherein (1)>Is the coupling reflection angle of the coupling reflection surface.
Optionally, the material of the coupling reflection surface is a coupling reflection film.
Optionally, the material of the waveguide substrate is a low refractive index optical plastic.
Optionally, the low refractive index material is the low refractive index optical plastic.
Optionally, the high refractive index material is high refractive index glass.
Optionally, the optical waveguide device further comprises a micro display screen, an illumination engine and an eyepiece system; the micro display screen, the illumination engine and the eyepiece system are sequentially arranged along the direction of light waves entering the waveguide substrate.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses an optical waveguide device, which comprises a waveguide substrate, an optical wave output part and a coupling reflecting surface; reflecting the input light waves into the waveguide substrate through the coupling reflecting surface; transmitting the light wave reflected by the coupling reflecting surface to the light wave output part in a total reflection mode through the waveguide substrate; the structure of the light wave output part comprises a microstructure obtained by matching a low refractive index material and a high refractive index material in a sawtooth shape; and the light wave transmitted to the light wave output part is output through the microstructure, so that the problem that the geometrical light waveguide easily forms a wedge angle due to a cementing layer, and stray light is generated at the cementing line due to scattering and diffraction effects is avoided, and the requirement of a large field of view during near-to-eye display is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an optical waveguide device according to the present invention;
FIG. 2 is a schematic diagram of an optical wave input of an optical waveguide device according to the present invention;
FIG. 3 shows a light wave R of an optical waveguide device according to the present invention 0 An exit schematic;
FIG. 4 shows a light wave R of an optical waveguide device according to the present invention 2 An exit schematic;
FIG. 5 shows a light wave R of an optical waveguide device according to the present invention 1 An exit schematic;
fig. 6 is a block diagram of an embodiment of an optical waveguide device according to the present invention.
Detailed Description
The invention aims to provide an optical waveguide device, so as to avoid the problem of stray light caused by scattering and diffraction effects and meet the requirement of a large field of view in near-eye display.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, an optical waveguide device includes: a waveguide substrate 1, an optical wave output section 2, and a coupling reflection surface 3; the coupling reflection surface 3 is arranged at the light wave input position of the waveguide substrate 1 and is used for reflecting the input light wave into the waveguide substrate 1; coupling reflection angle of the coupling reflection surfaceThe range of the values is as follows:
wherein n is 1 Is the refractive index of the low refractive index material, n 2 The refractive index of the high refractive index material, θ, is the maximum incident angle of the light wave. The coupling reflecting surface is made of a coupling reflecting film.
Specifically, as shown in FIG. 2, the coupling reflection angleThe angle between the coupling reflecting surface and the direction of the optical waveguide is shown by an arrow in fig. 1; the maximum angle of incidence of the light wave is the angle of incidence of the light wave at the edge of the virtual image in the eyepiece system (R 1 Or R is 2 ) And 0 field of view light wave R 0 Is included in the bearing.
The light wave output part 2 is arranged at the output position of the waveguide substrate 1; the waveguide substrate 1 is configured to transmit the light wave reflected by the coupling reflection surface 3 to the light wave output unit 2 in a total reflection manner; the waveguide substrate is made of low-refractive-index optical plastic.
The light wave output part 2 comprises a microstructure 4 formed by matching a low refractive index material and a high refractive index material in a saw-tooth shape; the microstructure is used for outputting the light waves transmitted to the light wave output part. The low refractive index material is the low refractive index optical plastic. The high refractive index material is high refractive index glass.
The right angle gamma of the microstructure has the following range:
wherein n is 1 Is the refractive index of the low refractive index material, n 2 The refractive index of the high refractive index material, θ, is the maximum incident angle of the optical waveguide. The left angle β of the microstructure has the value:wherein (1)>Is the coupling reflection angle of the coupling reflection surface.
Specifically, as shown in fig. 3, the left angle β is an angle between the left edge of the saw tooth of the microstructure and the optical waveguide direction, and the right angle γ is an angle between the right edge of the saw tooth of the microstructure and the optical waveguide direction.
The optical waveguide device also comprises a micro display 5, an illumination engine 6 and an eyepiece system 7; the micro display 5, the illumination engine 6 and the eyepiece system 7 are arranged in sequence along the direction of light waves entering the waveguide substrate.
The optical waveguide device provided by the invention is adopted to carry out optical waveguide, specifically, as shown in fig. 2, optical waves of an eyepiece system enter the optical waveguide transmission device, R 0 Is 0 field angle light wave, R 1 Is the right edge light wave (field light wave), R 2 For the left edge light wave (reverse field light wave), the reflection angle is coupledR 2 、R 0 、R 1 After entering the waveguide substrate, the light wave enters the waveguide substrate to be transmitted in a total reflection way, and three groups of light waves with the incident angles of alpha ', alpha and alpha' are formed.
As shown in fig. 3-5, the light wave R 0 、R 1 、R 2 And the total reflection output is generated at the junction of the high refractive index material and the low refractive index material of the microstructure respectively, and the total reflection output enters human eyes.
As shown in FIG. 6, as a specific embodiment, the low refractive index material is PMMA, the refractive index N1 is 1.49, the high refractive index material is N-SF66, the refractive index N2 is 1.92, the saw tooth width of the microstructure is 50um, the distance between saw teeth of the microstructure is 50um, the maximum incident angle θ of the light wave is 14.2 °, the left side angle β of the microstructure is 56.4 °, the right side angle γ is 61.8 °, and the coupling reflection angle is28.2 deg., the horizontal viewing angle is 42.88 deg., i.e., the + theta and-theta' angles are 42.88 deg., as shown in fig. 4 and 5.
The optical waveguide device provided by the invention has the advantages that: (1) relatively low process requirements; (2) The problem that the geometrical optical waveguide is easy to form a wedge angle due to the bonding layer, and scattered light and stray light are generated due to the diffraction effect at the bonding line is solved; (3) large field of view is achieved.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, which are intended to be only illustrative of the methods and concepts underlying the invention, and not all examples are intended to be within the scope of the invention as defined by the appended claims.
Claims (6)
1. An optical waveguide device, the optical waveguide device comprising: a waveguide substrate, an optical wave output section, and a coupling reflection surface;
the coupling reflecting surface is arranged at the light wave input position of the waveguide substrate and is used for reflecting the input light wave into the waveguide substrate;
the light wave output part is arranged at the output position of the waveguide substrate; the waveguide substrate is used for transmitting the light waves reflected by the coupling reflection surface to the light wave output part in a total reflection mode;
the light wave output part comprises a microstructure obtained by matching a first refractive index material and a second refractive index material in a sawtooth shape; the microstructure is used for outputting the light waves transmitted to the light wave output part; the refractive index of the first refractive index material is smaller than that of the second refractive index material; the waveguide substrate is made of a material with a first refractive index;
coupling reflection angle of the coupling reflection surfaceThe range of the values is as follows:
wherein n is 1 Is the refractive index of the first refractive index material, n 2 A refractive index of the second refractive index material, θ being a maximum incident angle of the optical waveguide; the coupling reflection angle of the coupling reflection surface is the included angle between the coupling reflection surface and the optical waveguide direction, and the maximum incident angle of the light wave is the included angle between the light wave at the edge of the virtual image in the ocular system and the light wave with 0 view field;
the right angle gamma of the microstructure has the following range:
the left angle β of the microstructure has the value:
the light wave is output through total reflection at the junction of the second refractive index material and the first refractive index material of the microstructure.
2. An optical waveguide device according to claim 1, wherein the material of the coupling reflection surface is a coupling reflection film.
3. An optical waveguide device according to claim 1, wherein the waveguide substrate is of PMMA.
4. An optical waveguide device according to claim 1 wherein the first refractive index material is PMMA.
5. An optical waveguide device according to claim 1 wherein the second refractive index material is N-SF66.
6. The optical waveguide device of claim 1, further comprising a micro-display, an illumination engine, and an eyepiece system;
the micro display screen, the illumination engine and the eyepiece system are sequentially arranged along the direction of light waves entering the waveguide substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810463667.3A CN108627910B (en) | 2018-05-15 | 2018-05-15 | Optical waveguide device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810463667.3A CN108627910B (en) | 2018-05-15 | 2018-05-15 | Optical waveguide device |
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| Publication Number | Publication Date |
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| CN108627910A CN108627910A (en) | 2018-10-09 |
| CN108627910B true CN108627910B (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810463667.3A Active CN108627910B (en) | 2018-05-15 | 2018-05-15 | Optical waveguide device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111474721A (en) * | 2020-05-07 | 2020-07-31 | 谷东科技有限公司 | Waveguide display device and augmented reality display apparatus |
| CN111830715A (en) * | 2020-07-28 | 2020-10-27 | 谷东科技有限公司 | Waveguide display device with two-dimensional extended pupil and augmented reality display equipment |
| CN111830716A (en) * | 2020-07-28 | 2020-10-27 | 谷东科技有限公司 | Waveguide display device and augmented reality display apparatus |
| CN118759630A (en) * | 2024-08-02 | 2024-10-11 | 北京灵犀微光科技有限公司 | Optical waveguide device and near-eye display device |
| CN118759629B (en) * | 2024-08-02 | 2024-12-27 | 北京灵犀微光科技有限公司 | Optical waveguide component and near-eye display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07318709A (en) * | 1994-05-27 | 1995-12-08 | Sekisui Chem Co Ltd | Light control sheet |
| CN104614858A (en) * | 2015-01-25 | 2015-05-13 | 上海理湃光晶技术有限公司 | Saw tooth structure plane waveguide visual optical display device for enhancing reality |
| CN105929545A (en) * | 2016-06-20 | 2016-09-07 | 东莞市长资实业有限公司 | Waveguide type head-mounted display optical device |
| CN208188390U (en) * | 2018-05-15 | 2018-12-04 | 深圳珑璟光电技术有限公司 | A kind of optical waveguide device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013219622B4 (en) * | 2013-09-27 | 2021-01-14 | tooz technologies GmbH | Optical element and display device with such an optical element |
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2018
- 2018-05-15 CN CN201810463667.3A patent/CN108627910B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07318709A (en) * | 1994-05-27 | 1995-12-08 | Sekisui Chem Co Ltd | Light control sheet |
| CN104614858A (en) * | 2015-01-25 | 2015-05-13 | 上海理湃光晶技术有限公司 | Saw tooth structure plane waveguide visual optical display device for enhancing reality |
| CN105929545A (en) * | 2016-06-20 | 2016-09-07 | 东莞市长资实业有限公司 | Waveguide type head-mounted display optical device |
| CN208188390U (en) * | 2018-05-15 | 2018-12-04 | 深圳珑璟光电技术有限公司 | A kind of optical waveguide device |
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| Publication number | Publication date |
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| CN108627910A (en) | 2018-10-09 |
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