CN118011557A - Waveguide sheet, diffraction optical waveguide display device - Google Patents
Waveguide sheet, diffraction optical waveguide display device Download PDFInfo
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- CN118011557A CN118011557A CN202410328906.XA CN202410328906A CN118011557A CN 118011557 A CN118011557 A CN 118011557A CN 202410328906 A CN202410328906 A CN 202410328906A CN 118011557 A CN118011557 A CN 118011557A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 50
- 238000010168 coupling process Methods 0.000 claims abstract description 33
- 238000005859 coupling reaction Methods 0.000 claims abstract description 33
- 230000008878 coupling Effects 0.000 claims abstract description 25
- 238000004422 calculation algorithm Methods 0.000 claims description 22
- 238000005457 optimization Methods 0.000 claims description 17
- 238000012545 processing Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 7
- 210000001747 pupil Anatomy 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 5
- 230000002068 genetic effect Effects 0.000 claims description 4
- 238000002922 simulated annealing Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 238000002945 steepest descent method Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- LTYMSROWYAPPGB-UHFFFAOYSA-N diphenyl sulfide Chemical compound C=1C=CC=CC=1SC1=CC=CC=C1 LTYMSROWYAPPGB-UHFFFAOYSA-N 0.000 claims description 2
- 229910000449 hafnium oxide Inorganic materials 0.000 claims description 2
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 claims description 2
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 2
- 229920000767 polyaniline Polymers 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 229920002554 vinyl polymer Polymers 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 description 9
- 230000003190 augmentative effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002840 optical waveguide grating Methods 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
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Classifications
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- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/124—Geodesic lenses or integrated gratings
-
- 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
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/34—Optical coupling means utilising prism or grating
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The application discloses a waveguide sheet and a diffraction optical waveguide display device.A coupling-in grating setting area, an extension grating setting area and a coupling-out grating setting area which are connected in sequence by optical paths are arranged on the waveguide sheet; the coupling grating setting area is connected with the optical path of the collimating lens; the coupling-out grating setting area transmits image information to a user; the coupling grating setting area is provided with a coupling grating; an extension grating is arranged on the extension grating arrangement area; the coupling-out grating is arranged on the coupling-out grating arrangement area. The device optimizes micro-nano structural parameters such as shapes, periods, duty ratios, inclination angles and the like of 3 gratings by arranging the coupling-in gratings, the extending gratings and the coupling-out gratings on the waveguide sheet, so that the uniformity of the output brightness of the optical waveguide diffraction device for the near-eye display system is improved from 9.8% to 62.9%, and the watching and using experience of a user is greatly improved.
Description
Technical Field
The application relates to the technical field of augmented reality, in particular to a waveguide sheet and a diffraction optical waveguide display device.
Background
Augmented reality (Augmented Reality, AR) technology, which is a technology that combines virtual information with a real world environment, superimposes virtual elements in a user's real view through a display device. Optical waveguide devices are one of the key components that determine whether a high quality augmented reality experience can be achieved.
The prior optical waveguide device has the following problems in the use process:
First, since coupling efficiency is limited, the optical signal is attenuated during transmission, resulting in a decrease in brightness. Secondly, the brightness uniformity of the output light beam is poor, and brightness difference or uneven distribution occurs. These problems can affect the quality and stability of the augmented reality experience.
In order to solve the above problems, an inclined grating and a graded grating are mainly used in an optical waveguide device to improve the light efficiency.
The inclined grating increases the coupling efficiency of light by introducing oblique coupling into the optical waveguide path, and obviously improves the coupling efficiency of optical signals and enhances the brightness of output light beams by optimizing grating parameters and inclination angles. As in cn202010921027.X, an optical waveguide device for an AR apparatus, a method for manufacturing the same, and an AR apparatus are disclosed, in which a first grating is a tilted grating, but the device does not optimize design parameters of the used grating, and the resulting device cannot achieve an improvement in imaging uniformity.
A graded grating is a grating structure with a gradually changing coupling coefficient. By introducing the characteristic of gradual coupling into the optical waveguide, the coupling efficiency of optical signals at different positions can be increased, and the uniformity of the brightness of the output light beam can be improved. The prior art does not see the use of graded gratings in optical waveguide devices.
The information disclosed in the background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The application provides a diffraction optical waveguide display device, wherein an optical waveguide grating used in the device can solve the problems of low light efficiency and poor brightness uniformity of the existing optical waveguide product through micro-nano structure parameter design, and has the advantages of small volume, light weight, strong designability, easiness in processing and the like.
The present application provides a diffraction optical waveguide display device, comprising: the micro display screen is connected with the waveguide sheet optical path through the collimating lens; the device is characterized in that a coupling-in grating setting area, an extension grating setting area and a coupling-out grating setting area which are sequentially connected with the optical path are arranged on the waveguide sheet;
The coupling grating setting area is connected with the optical path of the collimating lens; the coupling-out grating setting area transmits image information to a user;
the coupling grating setting area is provided with a coupling grating; an extension grating is arranged on the extension grating arrangement area; the coupling-out grating setting area is provided with a coupling-out grating; the coupling grating is a rectangular grating or an inclined grating; the extension grating is a rectangular grating or a turning grating; the turning grating and the coupling grating adopt a duty cycle gradual change structure;
The coupling-in grating and the coupling-out grating have the same constant; the grating constant of the extended grating is within the range of 0.4-0.8 of the coupling-in grating or the coupling-out grating constant.
Preferably, when the coupling-in grating is a rectangular grating, the extension grating and the coupling-out grating are both rectangular gratings.
Preferably, the micro display includes: a display panel, a flat cable and a PCB board; the display panel is electrically connected with the PCB through a flat cable; the PCB is used for processing background or remote input image signals; the display panel is used for converting an image input by the flat cable into a visible light signal and transmitting the visible light signal to the collimating lens; the display panel is connected with one end of the collimating lens in an optical path.
Preferably, the wavelength range of light output by the micro display screen to the collimating lens is 380 nm-780 nm, the angle of input light is 0-45 degrees relative to the optical axis range of a lens group in the collimating lens, the focal length range is 10-20 mm, the entrance pupil diameter is 5-15 mm, and the exit pupil diameter is 3-10 mm.
Preferably, the incoupling grating is used for diffracting normally incident parallel light so that non-zero order diffracted light meets the total reflection condition;
the expansion grating is used for realizing expansion and transmission of incident light coupled into the grating in at least two directions;
The coupling-out grating is used for guiding the light which is transmitted in by the extension grating to the user side through diffraction.
Preferably, the waveguide sheet includes: the sheet body is plated with a dielectric film layer with the refractive index more than or equal to 1.9; the dielectric film layer is made of at least one of titanium dioxide, hafnium oxide, lithium niobate, polyvinyl phenyl sulfide and polyaniline.
Preferably, the shape, period, duty cycle, tilt angle of the in-coupling grating, the turning grating, the out-coupling grating are in a graded form.
Preferably, an optimization algorithm is adopted to optimize the shapes, the periods, the duty ratio, the inclination angle and the heights of the coupling-in grating, the turning grating and the coupling-out grating according to the wavelength and the angle of the incident light.
Preferably, the optimization algorithm is at least one of a steepest descent method, a genetic algorithm, a particle swarm algorithm, or a simulated annealing algorithm.
Preferably, the optimization result selection criteria of the structural parameters of the coupling-in grating, the turning grating and the coupling-out grating is that the average output brightness and uniformity of the coupling-out image are above 60%.
The application has the beneficial effects that:
1) The imaging uniformity of the diffraction optical waveguide display device provided by the application can reach 62.875%, and compared with the imaging uniformity of the device with the existing structure, the imaging uniformity of the diffraction optical waveguide display device is obviously improved by 9.78%. The imaging brightness is also obviously improved, and compared with the existing device, the imaging brightness can be improved to 2500cd/m 2 by improving the brightness of 1500cd/m 2.
2) According to the diffraction optical waveguide display device provided by the application, the coupling-in grating, the extension grating and the coupling-out grating are arranged on the waveguide sheet, and micro-nano structure parameters such as the shape, the period, the duty ratio, the inclination angle and the like of the 3 gratings are optimized, so that the uniformity of the output brightness of the optical waveguide diffraction device for the near-eye display system is improved from 9.8% to 62.9%, and the watching and using experience of a user is greatly improved.
Drawings
FIG. 1 is a schematic view of an overall optical waveguide device in at least one embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating light transmission in at least one embodiment of the present disclosure;
FIG. 3 is a schematic view of a micro display in at least one embodiment of the present disclosure;
FIG. 4 is a schematic view of a collimating lens in at least one embodiment of the present application;
FIG. 5 is a schematic view of a waveguide sheet according to embodiment 2 of the present application;
FIG. 6 is a schematic view of a waveguide sheet according to example 3 of the present application;
FIG. 7 is a schematic view of a waveguide sheet according to example 4 of the present application;
FIG. 8 is a graph showing the brightness uniformity improvement in at least one embodiment of the present application, wherein a) is the result obtained in the embodiment of the present application; b) Results obtained for existing devices;
Detailed Description
The invention is described in further detail below with reference to the drawings and examples, but is not limited in any way to any changes or modifications made based on the teachings of the invention, which fall within the scope of the invention.
Examples
Materials and instruments used in the examples below were commercially available unless otherwise specified; the detection method is the existing method unless specified.
Example 1
Referring to fig. 1 and 3, the waveguide optical device of the present embodiment includes: the micro display screen 001, the collimating lens 002 and the waveguide plate 003, wherein the micro display screen 001 is used for converting an input digital signal into an analog signal output image and transmitting the analog signal output image to the collimating lens 002 connected with the optical path; the collimating lens 002 is used for collimating the image output by the micro display screen 001 and outputting the collimated image to the side surface of one end of the waveguide sheet 003 connected with the optical path of the collimated image; the waveguide 003 is used for outputting an image collimated by the collimator lens 002 to the human eye from the other end side after diffraction, waveguide transmission and expansion. The collimating lens 002 is composed of a plurality of optical lenses, and is composed of a concave lens, a convex lens, a plane mirror, a flat concave mirror and a flat convex mirror which are sequentially connected in an optical path. The lens is made of glass or resin. The micro display screen outputs light to the collimating lens, the wavelength range of the light is 380 nm-780 nm, the angle of the input light is 0-45 degrees relative to the optical axis range of the lens group in the collimating lens, the focal length range is 10-20 mm, the diameter of the entrance pupil is 5-15 mm, and the diameter of the exit pupil is 3-10 mm. The waveguide sheet body of the waveguide sheet 003 is coated with a dielectric film layer with a refractive index of 1.9 or more, and the dielectric material is titanium dioxide (TiO 2).
Referring to fig. 2, the waveguide sheet 003 includes: coupled into the grating arrangement region 005, expanded grating arrangement region 006, and coupled out of the grating arrangement region 007. The grating structure coupled to the grating setting area 005 is communicated with the collimating lens 002 pipeline and is used for realizing diffraction on the vertical incidence parallel light, so that the incidence light is diffracted through the grating diffraction effect, and the diffraction angle meets the total reflection condition; the coupling-in grating and the coupling-out grating have the same constant; the grating constant of the extended grating is within the range of 0.4-0.8 of the coupling-in grating or the coupling-out grating constant.
The extended grating setting region 006 is arranged at one side of the coupled grating setting region 005, the grating structure on the coupled grating setting region 005 and the grating structure on the extended grating setting region 006 are in optical path connection, and the grating structure on the coupled grating setting region 005 is used for realizing expansion and transmission of at least two directions of incident light coupled into the grating setting region 005;
The coupling-out grating arrangement region 007 is arranged at one side of the extension grating 006, the grating structure on the extension grating arrangement region 006 is connected with the grating structure optical path on the coupling-out grating arrangement region 007,
The grating structure on the extended grating setting region 006 is used for realizing at least two-direction extension and transmission of incident light coupled into the grating; the grating structure on the outcoupling grating-setting region 007 functions to direct the light, which is incoming to the extended grating, out to the human eye by diffraction.
Example 2
Vertical grating embodiment 2 is a further limitation of the optical waveguide sheet portion of embodiment 1, please refer to fig. 3 and 5. The micro-display 001 used in this example is shown in fig. 3 except for all the components contained in example 1, and the micro-display 001 includes: display panel 008, flat cable 009, PCB 010; the display panel 008 is electrically connected with the PCB 010 through the flat cable 009. The PCB 010 is used for processing background or remote input image signals; the flat cable 009 is used for inputting the signal after the conversion processing of the PCB board 010 into the display panel 008, and the display panel 008 is used for converting the image input by the flat cable 009 into a visible light signal and transmitting the visible light signal to the collimator lens 002. The display panel 008 is optically connected to one end of the collimator lens 002.
In this embodiment, the coupling grating 012 is disposed on the coupling grating disposition region 005; a turning grating 013 is arranged on the extended grating setting region 006; an out-coupling grating 014 is provided on the out-coupling grating provision region 007. The coupling-in grating 012, the turning grating 013 and the coupling-out grating 014 are all rectangular gratings with the same height and the height of 80nm, and the structural design is beneficial to the simplification of the processing technology and the reduction of the cost, and the optical waveguide sheet with the diffraction function can be achieved by only one-time imprinting or photoetching.
Example 3
As shown in fig. 6, the present embodiment optimizes the oblique grating on the basis of embodiment 2,
The optimization specific steps are as follows:
step S1: determining output brightness uniformity as an optimization target according to the application requirements of the optical waveguide;
step S2: mathematical modeling is carried out on the period, shape, duty ratio, inclination angle and height parameters of the micro-nano grating, and a parameterized model is established so as to carry out the processing of an optimization algorithm;
Step S3: selecting a proper optimization algorithm, such as a steepest descent method, a genetic algorithm, a particle swarm algorithm or a simulated annealing algorithm, according to the actual situation, wherein the algorithm can find a global optimal solution or a better approximate solution in a multi-parameter and multi-objective optimization problem;
step S4: according to the selection of the model and the algorithm, a proper optimization strategy is designed, and the search range and constraint conditions of parameters are determined so as to ensure that the result meets the actual application requirements and the manufacturing feasibility;
Step S5: the grating performance under different parameter combinations is simulated and analyzed by utilizing computer-aided simulation software, the influence of various parameters on the grating performance is evaluated, and the optimal solution is searched in a parameter space by utilizing a selected optimization algorithm, and the parameters of period, shape, duty ratio, inclination angle and height are adjusted so as to achieve the optimal brightness uniformity.
Through the steps and the method, the period, the shape, the duty ratio, the inclination angle and the height parameters of the micro-nano grating can be optimized by effectively utilizing an optimization algorithm, so that the uniformity of the output brightness of the optical waveguide is improved.
The difference between the waveguide plate 003 and embodiment 2 in this embodiment is that: a slanted grating 015 is arranged on the incoupling grating-arranging region 005. The tilt angle of the tilted grating 015 can be designed according to the refractive index of the substrate material, the angle and the wavelength of the incident light, in this embodiment, the tilt angle is 45 °, the refractive index of the substrate material is 1.9, the angle of the incident light is 90 °, the wavelength of the incident light is 532nm, and under the parameter condition, the non-zero diffraction efficiency of the incident light can be maximized.
The adoption of the inclined grating 015 can effectively improve the diffraction efficiency of the waveguide sheet, on one hand, reduce the input brightness requirement on the micro display screen, for example, if the output brightness of 1500cd/m 2 is required to be maintained, the input brightness can be reduced from the original 500000cd/m 2 to 300000cd/m 2, and on the other hand, the coupling-out brightness of the final coupling-out grating can be improved, for example, if the input brightness of 500000cd/m 2 is maintained unchanged, the output brightness can be improved to 2500cd/m 2.
Example 4
Tilted grating embodiment 5 is a further optimization on embodiment 4. As shown in fig. 7, the waveguide plate in this embodiment also includes all the components of embodiment 1 and three grating regions in embodiment 2, and the slanted incoupling grating 015 in embodiment 3.
This embodiment differs from the previous embodiment in that: the extension grating setting region 006 is provided with a turning grating 016; an outcoupling grating 017 is provided on the outcoupling grating providing region 007.
The turning grating 016 and the coupling grating 017 adopt a duty cycle gradient design, and the heights of the coupling grating, the turning grating and the coupling grating are optimized through a genetic algorithm and a simulated annealing algorithm. After optimization by an algorithm, the height of the transfer refractive grating 016 is 80nm and is fixed, and the duty ratio is gradually increased from 0.35 to 0.75; the height of the coupling-out grating is gradually increased from 40nm to 120nm, and the duty cycle is gradually reduced from 0.8 to 0.2.
The aim of the optimization is that: on the premise of ensuring larger light efficiency, the uniformity of the brightness of the coupled image is improved.
FIG. 8 shows the uniformity improvement effect of the diffractive optical waveguide display device obtained in example 4, and the average output brightness and brightness uniformity index of the comparative waveguide sheet were calculated as follows: the brightness values I A、IB、IC、ID、IE of the 4 angles A, B, C and D of the 90% view field and the center E point of the view field are respectively measured, the brightness uniformity of the image plane is represented by the ratio of the average value of the brightness of each of the 4 angles to the average value of the center brightness, and the calculation formula is as follows:
Fig. 8 (a) shows an imaging uniformity of 62.875% after using example 5 of the present application, and fig. 8 (b) shows an imaging uniformity of 9.78% for a normal optical waveguide. Although the example can obtain better imaging effect, the difficulty in processing and preparation is larger, so that the specific implementation scheme is selected to comprehensively consider the aspects of production and processing difficulty, cost, performance requirement and the like.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (10)
1. The waveguide sheet is characterized in that a coupling-in grating setting area, an extension grating setting area and a coupling-out grating setting area which are connected in sequence in an optical path are arranged on the waveguide sheet;
The coupling grating setting area is connected with the optical path of the collimating lens; the coupling-out grating setting area transmits image information to a user;
the coupling grating setting area is provided with a coupling grating; an extension grating is arranged on the extension grating arrangement area; the coupling-out grating setting area is provided with a coupling-out grating; the coupling grating is a rectangular grating or an inclined grating; the extension grating is a rectangular grating or a turning grating; the turning grating and the coupling grating adopt a duty cycle gradual change structure;
The coupling-in grating and the coupling-out grating have the same constant; the grating constant of the extended grating is within the range of 0.4-0.8 of the coupling-in grating or the coupling-out grating constant.
2. The waveguide sheet according to claim 1, wherein when the coupling-in grating is a rectangular grating, the extension grating and the coupling-out grating are both rectangular gratings.
3. The waveguide according to claim 1, wherein the micro display comprises: a display panel, a flat cable and a PCB board; the display panel is electrically connected with the PCB through a flat cable; the PCB is used for processing background or remote input image signals; the display panel is used for converting an image input by the flat cable into a visible light signal and transmitting the visible light signal to the collimating lens; the display panel is connected with one end of the collimating lens in an optical path.
4. The waveguide according to claim 1, wherein the wavelength of light output from the micro display screen to the collimating lens is in the range of 380nm to 780nm, the angle of input light is in the range of 0 ° -45 ° with respect to the optical axis of the lens group in the collimating lens, the focal length is in the range of 10mm to 20mm, the entrance pupil diameter is in the range of 5mm to 15mm, and the exit pupil diameter is in the range of 3mm to 10 mm.
5. The waveguide sheet according to claim 1, wherein the incoupling grating is adapted to diffract normally incident parallel light such that non-zero order diffracted light satisfies a total reflection condition;
the expansion grating is used for realizing expansion and transmission of incident light coupled into the grating in at least two directions;
The coupling-out grating is used for guiding the light which is transmitted in by the extension grating to the user side through diffraction.
6. The waveguide sheet according to claim 1, wherein the waveguide sheet comprises: the sheet body is plated with a dielectric film layer with the refractive index more than or equal to 1.9; the dielectric film layer is made of at least one of titanium dioxide, hafnium oxide, lithium niobate, polyvinyl phenyl sulfide and polyaniline.
7. The waveguide according to claim 1, wherein the shape, period, duty cycle, tilt angle of the in-coupling grating, the turning grating, the out-coupling grating are graded.
8. The waveguide sheet according to claim 1, wherein the structural parameters of the in-coupling grating, the turning grating, the out-coupling grating, the shape, the period, the duty ratio, the inclination angle and the like are optimized according to the wavelength and the angle of incident light by an optimization algorithm;
The optimization algorithm is at least one of a steepest descent method, a genetic algorithm, a particle swarm algorithm or a simulated annealing algorithm.
9. The waveguide according to claim 8, wherein the optimization result of the structural parameters of the coupled grating, the turning grating, and the coupled grating is selected based on the average output brightness and uniformity of the coupled image being 60% or more.
10. A diffractive optical waveguide display device, comprising: the micro display screen is connected with the waveguide sheet optical path through the collimating lens; the waveguide sheet has the structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410328906.XA CN118011557A (en) | 2024-03-21 | 2024-03-21 | Waveguide sheet, diffraction optical waveguide display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410328906.XA CN118011557A (en) | 2024-03-21 | 2024-03-21 | Waveguide sheet, diffraction optical waveguide display device |
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| CN118011557A true CN118011557A (en) | 2024-05-10 |
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| CN202410328906.XA Pending CN118011557A (en) | 2024-03-21 | 2024-03-21 | Waveguide sheet, diffraction optical waveguide display device |
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