CN114859553B - Large-view-field left-right color separation double-channel waveguide and AR glasses - Google Patents
Large-view-field left-right color separation double-channel waveguide and AR glasses Download PDFInfo
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- 238000000926 separation method Methods 0.000 title claims abstract description 20
- 239000011521 glass Substances 0.000 title claims abstract description 10
- 210000001747 pupil Anatomy 0.000 claims abstract description 159
- 230000002911 mydriatic effect Effects 0.000 claims abstract description 35
- 239000013598 vector Substances 0.000 claims description 39
- 239000003086 colorant Substances 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims 5
- 208000006550 Mydriasis Diseases 0.000 claims 2
- 239000002356 single layer Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
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- 230000003190 augmentative effect Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
- G02B27/0081—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. enlarging, the entrance or exit pupil
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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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
- G02B6/0001—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
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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
- G02B6/0001—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
- G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
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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
- G02B6/0001—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
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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
- G02B6/0001—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
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
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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
- G02B2027/0178—Eyeglass type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a large-view-field left-right color separation dual-channel waveguide and AR glasses, wherein the waveguide comprises: an entrance pupil region, a first mydriatic region, a second mydriatic region, a first exit pupil region and a second exit pupil region; the first exit pupil area is positioned below the first expansion pupil area, and the second exit pupil area is positioned below the second expansion pupil area; the entrance pupil area is provided with a first cut-off filter and a second cut-off filter; the first sub-area, the first mydriatic area and the first exit pupil area form a first channel, and the second sub-area, the second mydriatic area and the second exit pupil area form a second channel. According to the invention, through arranging the first cut-off filter and the second cut-off filter, red light and blue light can be conducted in a targeted mode, so that the problem of incomplete red and blue display of a large-view-field single-layer waveguide is solved, and the monochromatic color uniformity of an image is improved.
Description
Technical Field
The invention relates to the technical field of AR display, in particular to a large-view-field left-right color separation dual-channel waveguide and AR glasses.
Background
The optical waveguide scheme has advantages in the aspects of definition, visual angle, volume and the like, so that the optical waveguide scheme becomes a mainstream optical display solution in the current augmented reality glasses, wherein the diffraction waveguide has a certain technical maturity and a small-batch mass production stage is performed. However, the current diffraction waveguide color display still faces the problem of chromatic dispersion, the chromatic dispersion is a color uniformity problem, the diffracted chromatic dispersion is a relatively great challenge, the characteristic size of the structure is equivalent to the wavelength of light, light is diffracted on the surface of the diffraction waveguide instead of common transmission or reflection, so that the diffraction waveguide color display is very sensitive to the wavelength, the transmission paths of light with different wavelengths in the optical waveguide are different, and the light with different wavelengths can be recovered into color only by ensuring the light with the same proportion of energy, which is very difficult.
There is a method of using three layers of diffraction waveguides to solve the dispersion problem, and the working mechanism of the three layers of waveguides is that three layers of light respectively conduct R, G, B, and the light enters human eyes through the same exit pupil and is superimposed into color in the human eyes. The two layers of waveguides are usually one layer for conducting R+G and the other layer for conducting G+B, and can be overlapped into color in human eyes, but the diffraction waveguide is required to have a larger working wavelength bandwidth and can conduct R and G or G and B at the same time, so that higher requirements are placed on the design, the production process and the refractive index of the material per se of the diffraction waveguide. And a layer of waveguide conducts R, G, B simultaneously, the wavelength of blue light (B) is taken as the conducting center wavelength, when the input light source is a large view field, a part of red light (R) and blue light (B) is missing at the edge of an image, so that the red light (R) and blue light (B) under the full view field are not fully displayed, and the monochrome color of the display image is uneven.
Disclosure of Invention
The embodiment of the invention provides a large-view-field left-right color separation dual-channel waveguide and AR glasses, which aim to solve the problem of incomplete red-blue display of a large-view-field single-layer waveguide and improve the monochromatic color uniformity of an image.
The embodiment of the invention provides a large-view-field left-right color separation dual-channel waveguide, which comprises the following components: an entrance pupil region, a first mydriatic region, a second mydriatic region, a first exit pupil region and a second exit pupil region; the first exit pupil area is positioned below the first expansion pupil area, and the second exit pupil area is positioned below the second expansion pupil area;
the entrance pupil area comprises a first sub-area and a second sub-area which are respectively positioned at the left half part and the right half part, a first cut-off filter is arranged on the first sub-area, a second cut-off filter is arranged on the second sub-area, and the colors of the first cut-off filter and the second cut-off filter are different;
the first sub-area, the first mydriatic area and the first exit pupil area form a first channel, and the second sub-area, the second mydriatic area and the second exit pupil area form a second channel.
Further, the first cut-off filter is a blue light cut-off filter, and the second cut-off filter is a red light cut-off filter.
Further, the system also comprises a large-field color light source for inputting RGB trichromatic light to the entrance pupil area;
the first sub-region of the entrance pupil region cuts off blue light, diffracts red light and green light into a first channel, and outputs red light and green light of a complete field of view through the first channel;
the second sub-region of the entrance pupil region cuts off red light and diffracts blue light and green light into a second channel, and blue light and green light of the complete field of view are output by the second channel.
Further, the angle of view of the large-view-field color light source is 40-50 degrees.
Further, the bandwidth of the blue light cut-off filter is 420-480 nm or 440-460 nm, and the bandwidth of the red light cut-off filter is 590-640 nm or 620-630 nm.
Furthermore, the entrance pupil area, the first expansion pupil area, the second expansion pupil area, the first exit pupil area and the second exit pupil area all adopt diffraction gratings, and the diffraction gratings are surface relief gratings or volume holographic gratings.
Further, the entrance pupil area is perpendicular to the grating directions of the first exit pupil area and the second exit pupil area, and the included angle between the entrance pupil area and the grating directions of the first expansion pupil area and the second expansion pupil area is 40-50 degrees;
the grating period of the first sub-region of the entrance pupil region is equal to the grating period of the first exit pupil region, and is the grating period of the first expansion pupil regionDoubling; the grating period of the second sub-region of the entrance pupil region is equal to the grating period of the second exit pupil region and is +.>Doubling; the grating period of the first subarea is unequal to the grating period of the second subarea.
Further, the vector sum of the grating period and the grating direction of the grating vectors of the entrance pupil area, the first mydriatic area, the second mydriatic area, the first exit pupil area and the second exit pupil area is 0.
Further, the waveguide is a butterfly waveguide with integrated left and right eyes, and the refractive index of the waveguide is 2.0.
The embodiment of the invention also provides AR glasses, which adopt the large-view-field left-right color separation dual-channel waveguide.
The embodiment of the invention provides a large-view-field left-right color separation dual-channel waveguide and AR glasses, wherein the waveguide comprises: an entrance pupil region, a first mydriatic region, a second mydriatic region, a first exit pupil region and a second exit pupil region; the first exit pupil area is positioned below the first expansion pupil area, and the second exit pupil area is positioned below the second expansion pupil area; the entrance pupil area comprises a first sub-area and a second sub-area which are respectively positioned at the left half part and the right half part, a first cut-off filter is arranged on the first sub-area, a second cut-off filter is arranged on the second sub-area, and the colors of the first cut-off filter and the second cut-off filter are different; the first sub-area, the first mydriatic area and the first exit pupil area form a first channel, and the second sub-area, the second mydriatic area and the second exit pupil area form a second channel. According to the embodiment of the invention, the first cut-off filter and the second cut-off filter are arranged, so that red light and blue light can be conducted in a targeted mode, the problem of incomplete red and blue display of a large-view-field single-layer waveguide is solved, and the monochromatic color uniformity of an image is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a large-field left-right color separation dual-channel waveguide according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a grating of a large-field left-right color separation dual-channel waveguide according to an embodiment of the present invention;
FIG. 3 is a schematic wave vector diagram of a large-field left-right color separation dual-channel waveguide according to an embodiment of the present invention;
fig. 4 is a schematic diagram of RGB band distribution of a large-field left-right color separation dual-channel waveguide according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that 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. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1, a large-field left-right color separation dual-channel waveguide 10 according to an embodiment of the present invention includes: an entrance pupil region 11, a first mydriatic region 21, a second mydriatic region 22, a first exit pupil region 31 and a second exit pupil region 32; the entrance pupil area 11 is disposed at a central position of the waveguide 10, the first and second pupil expansion areas 21 and 22 are symmetrically distributed at two sides of the entrance pupil area 11, the first exit pupil area 31 is located below the first pupil expansion area 21, and the second exit pupil area 32 is located below the second pupil expansion area 22;
the entrance pupil area 11 comprises a first sub-area and a second sub-area which are respectively positioned at a left half part and a right half part, a first cut-off filter 41 is arranged on the first sub-area, a second cut-off filter 42 is arranged on the second sub-area, and the colors of the first cut-off filter 41 and the second cut-off filter 42 are different;
the first sub-area, the first mydriatic area 21 and the first exit pupil area 31 form a first channel, and the second sub-area, the second mydriatic area 22 and the second exit pupil area 32 form a second channel.
In this embodiment, the large-field left-right dichroic dual-channel waveguide 10 has an entrance pupil area 11, a first mydriatic area 21 and a second mydriatic area 22 distributed left and right with respect to the entrance pupil area 11 as a symmetry axis, and a first exit pupil area 31 and a second exit pupil area 32 respectively distributed below the first mydriatic area 21 and the second mydriatic area 22. Meanwhile, the entrance pupil area 11 is divided into a first sub-area and a second sub-area by taking the left and right center lines of the entrance pupil area 11 as boundaries, so that a first channel is formed by the first sub-area, the first mydriatic area 21 and the first exit pupil area 22, and a second channel is formed by the second sub-area, the second mydriatic area 22 and the second exit pupil area 32. And further, a first cut-off filter 41 and a second cut-off filter 42 with different colors from the first cut-off filter 41 are respectively arranged on the first sub-region and the second sub-region, so that the first channel and the second channel respectively conduct light with different colors, the finally output image of the large-view-field left-right color separation dual-channel waveguide 10 can completely display light with different colors, the problem of incomplete color display of the large-view-field single-layer waveguide is solved, and the monochrome color uniformity of the image is improved.
In an embodiment, the first cut filter 41 is a blue cut filter, and the second cut filter 42 is a red cut filter.
Further, the large-field left-right color separation dual-channel waveguide 10 further includes a large-field color light source for inputting RGB three-color light to the entrance pupil area;
the first sub-region of the entrance pupil region 11 cuts off blue light, diffracts red light and green light into a first channel, and outputs red light and green light of a complete field of view through the first channel;
the second sub-region of the entrance pupil region 11 cuts off the red light and diffracts the blue and green light into the second channel, and the blue and green light of the complete field of view is output by the second channel.
In this embodiment, by providing the red and blue cut-off filters, only the red and green colors of the image are displayed on the left eye, and only the blue and green colors of the image are displayed on the right eye. In a single-layer waveguide using a certain wave band as a waveguide conducting light center wave band, left and right eyes can respectively display complete red, green and blue-green, the working wavelength bandwidth of the single-layer diffraction waveguide is reduced, and partial deletion of image colors is avoided. In a specific embodiment, the bandwidth of the blue light cut-off filter is 420-480 nm or 440-460 nm, and the bandwidth of the red light cut-off filter is 590-640 nm or 620-630 nm.
The large-view-field color light source input into the pupil area 11 cuts off blue light in the left half part (namely the first sub-area) through the first cut-off filter 41, only red light and green light enter a left path (namely the first channel) of the waveguide, the total reflection in the waveguide reaches the left first pupil expansion area 21, the total reflection of light diffracted by the grating on the first pupil expansion area 21 enters the first exit pupil area 31, and finally the red light and green light with complete view field are output in the first exit pupil area 31; in the right half (i.e. the second sub-area), red light is cut off by the second cut-off filter 42, only blue light and green light enter the right path of the waveguide, total reflection in the waveguide reaches the left second mydriatic area 22, total reflection of light diffracted by the grating on the second mydriatic area 22 enters the second exit pupil area 32, and finally blue light and green light of the complete field of view are output in the second exit pupil area 32.
The angle of view of the large-view-field color light source is 40-50 degrees, the wave vector of the input light source in the wave vector diagram of the waveguide grating can exist in a region BOX0 of the wave vector space defined by initial wave vectors kx and ky, and each corner of the region BOX0 can represent the wave vector of light of an angular falling point of an input image IMG 0; the light can only propagate in the slab when the wave vector of the light is in the region between the first and second boundaries.
In an embodiment, the entrance pupil area 11, the first mydriatic area 21, the second mydriatic area 22, the first exit pupil area 31 and the second exit pupil area 32 all use diffraction gratings, which are surface relief gratings or volume holographic gratings.
Wherein the entrance pupil area 11 is perpendicular to the grating directions of the first exit pupil area 31 and the second exit pupil area 32, and the included angle between the entrance pupil area 11 and the grating directions of the first mydriatic area 21 and the second mydriatic area 22 is 40-50 degrees;
the grating period of the first sub-region of the entrance pupil region 11 is equal to the grating period of the first exit pupil region 31, and is the grating period of the first exit pupil region 21Doubling; the grating period of the second sub-region of the entrance pupil region 11 is equal to the grating period of the second exit pupil region 32 and is +.>Doubling; the grating period of the first subarea is unequal to the grating period of the second subarea.
In this embodiment, in the yx plane, the grating direction of the entrance pupil area 11 is parallel to the x direction, the grating direction of the exit pupil area (i.e. the first exit pupil area 31 and the second exit pupil area 32) is parallel to the y direction, the entrance pupil area is perpendicular to the grating direction of the exit pupil area, and the angle between the pupil area (i.e. the first pupil area 21 and the second pupil area 22) and the grating direction of the entrance pupil area is 40 ° to 50 °, for example, specifically 45 °.
Referring to FIG. 2, the left and right center lines of the entrance pupil area 11 are defined byBlue light cut filter 41 is added to the left half of the entrance pupil area 11 (i.e. the first sub-area) and red light cut filter 42 is added to the right half (i.e. the second sub-area). The grating periods of the first sub-region and the second sub-region of the entrance pupil region 11 are d1 and d2, when the input light source is at a large field angle of 40-50 degrees, d1 is not equal to d2, d1 is a period set for compatibility with red-green light wave bands, and red-green light of the large field input light source can be completely conducted in the waveguide 10 and then output; d2 is a period set for compatibility with blue-green light wave bands, and blue-green light of a large-field input light source can be output after being conducted in the waveguide. Grating periods d21, d22 are set in the first and second mydriatic areas 21, 22, respectively, and grating periods d31, d32 are set in the first and second exit pupil areas 31, 32, respectively, all gratings being diffraction gratings, wherein
In one embodiment, the waveguide 10 is a butterfly waveguide with integrated left and right eyes, and the refractive index of the waveguide is 2.0.
In the embodiment, the left-right eye integrated butterfly waveguide is used, the left-right paths respectively conduct red, green and blue-green, so that the red and blue light of the large-view-field light source is completely displayed after passing through the waveguide 10, and the image uniformity of the red and blue light is improved.
In an embodiment, the sum of the grating period and the grating direction of the grating vectors of the entrance pupil area 11, the first mydriatic area 21, the second mydriatic area 22, the first exit pupil area 31 and the second exit pupil area 32 is 0.
As shown in fig. 3, in the wave vector diagram of the grating distribution of the large-field left-right color separation dual-channel waveguide 10 provided by the embodiment of the present invention, light with a specific wavelength may propagate in the waveguide 10 along a left path and a right path. The wave vector of the input light IN0 may exist IN one region BOX0 of the wave vector space defined IN terms of the initial wave vectors kx and ky. Each corner of the region BOX0 may represent a wave vector of light at the corner of one input image IMG 0.
BND1 represents a first boundary for meeting the Total Internal Reflection (TIR) criteria in waveguide 10. BND2 represents the second boundary of the maximum wave vector of waveguide 10. The maximum wave vector may be determined by the refractive index of the waveguide 10. Only when the wave vector of the light is in the ZONE1 between the first and second boundary BND1, 2, the light can propagate in the waveguide 10. If the wave vector of the light is outside the ZONE1, the light may leak out of the waveguide 10 or not propagate at all.
For a predetermined integer mij (i=1, 2, 3j=1, 2), the grating period (d) and direction (θ) of the grating vector may satisfy the vector sum Σmijvij=0, i.e. the conduction of the wave vector forms a closed path. Where i is a region location identity, such as 1=entrance pupil, 2=exit pupil, 3=exit pupil; j is a path identifier, such as 1=left path, 2=right path (e.g., left path wave vector sum is m11v11+m21v21+m31v31=0). The grating period (d) and the grating direction (θ) of a diffraction grating may be determined by the grating vector V of the diffraction grating. The grating vector V may be defined as a vector having a direction perpendicular to the diffraction lines of the diffraction grating and an amplitude given by 2pi/d, where d is the grating period (i.e. the fringe spacing).
Incident light IN0 enters waveguide 10 from region BOX0 and is conducted IN the negative direction of ky to the left of grating direction V11. Wherein the wave vector of the left transmission light B1a is in the region BOX1a, the region BOX1a contains the wave vectors of red light and green light of the full field of view, the transmission light B1a is transmitted towards the direction V21, the wave vector thereof is in the region BOX2a, the transmission light B2a is transmitted towards the direction V31, the wave vector thereof is in the region BOX3a, and the image OUT1 is finally output; according to the waveguide theory, paths of three wave vectors V11, V21 and V31 in the waveguide 10 are closed loops, so that the symmetrical relation between the input and output of the waveguide can be ensured. The incident light IN0 enters the waveguide from the region BOX0 and is conducted IN the positive direction ky to the right of the grating direction V12. Wherein the wave vector of the conducted light B1B is in the region BOX1B, the region BOX1B contains the wave vectors of the blue light and the green light of the full field of view, the conducted light B1B is conducted in the direction of V22, the wave vector thereof is in the region BOX2B, the conducted light B2B is conducted in the direction of V32, the wave vector thereof is in the region BOX3B, and the image OUT2 is finally output; according to the waveguide theory, paths of three wave vectors V12, V22 and V32 in the waveguide 10 are closed loops, so that the symmetrical relation between the input and output of the waveguide can be ensured. The final output image, OUT1 and OUT2, coincide at infinity.
As shown in fig. 4, a color input light source distributed in RGB wave bands enters a large-view-field left-right color separation dual-channel waveguide 10, a blue light cut-off filter 41 with a wavelength of 420-480 nm or 440-460 nm is arranged in a first sub-region of an entrance pupil region 11, red-green light except blue light enters the waveguide 10, propagates in a left path of the waveguide 10, and finally an image of the red-green light is output in a first exit pupil region 31; a red light cut filter 42 having a wavelength of 590 to 640nm or 620 to 630nm is provided in the second sub-region of the entrance pupil region 11, and red-green light other than red light enters the waveguide 10, propagates in the right path of the waveguide 10, and finally outputs an image of blue-green light in the second exit pupil region 32.
In the wave vector diagram of the grating distribution of the large-field left-right color separation dual-channel waveguide 10 in fig. 3, the refractive index of the waveguide n2=2.0, the light source with a large field angle of 51 degrees and a display size ratio of 16:9 is input into the waveguide 10, the grating period is adjusted in the first subarea of the entrance pupil area 11 of the waveguide 10, so that the left edge of the red light image just falls in the second boundary BND2 of the waveguide 10, the right edge of the green light image just falls outside the first boundary BND1 of the waveguide, and all the red-green light images can propagate in the waveguide; the grating period is adjusted in the second sub-region of the entrance pupil region 11 of the waveguide 10 such that the left edge of the blue image just falls outside the waveguide first boundary BND1 and the right edge of the green image just falls within the waveguide second boundary BND2, all blue-green images being able to propagate within the waveguide.
The embodiment of the invention also provides AR glasses, which adopt the large-view-field left-right color separation dual-channel waveguide 10.
In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (8)
1. A large field-of-view left-right dichroic dual channel waveguide, comprising: an entrance pupil region, a first mydriatic region, a second mydriatic region, a first exit pupil region and a second exit pupil region; the first exit pupil area is positioned below the first expansion pupil area, and the second exit pupil area is positioned below the second expansion pupil area;
the entrance pupil area comprises a first sub-area and a second sub-area which are respectively positioned at the left half part and the right half part, a first cut-off filter is arranged on the first sub-area, a second cut-off filter is arranged on the second sub-area, and the colors of the first cut-off filter and the second cut-off filter are different;
the first cut-off filter is a blue light cut-off filter, and the second cut-off filter is a red light cut-off filter;
the first sub-area, the first mydriasis area and the first exit pupil area form a first channel, and the second sub-area, the second mydriasis area and the second exit pupil area form a second channel;
the system also comprises a large-view-field color light source for inputting RGB three-color light to the entrance pupil area;
diffraction gratings are adopted in the entrance pupil area, the first pupil expansion area, the second pupil expansion area, the first exit pupil area and the second exit pupil area;
the period of the first sub-region is set to be a period d1 compatible with red-green light wave bands, the period of the second sub-region is set to be a period d2 compatible with blue-green light wave bands, and d1 is not equal to d2; adjusting the period of the first sub-area to enable the first channel to completely output red and green light of a large field of view, and adjusting the period of the second sub-area to enable the second channel to completely output blue and green light of a large field of view;
the grating period of the first sub-region of the entrance pupil region is equal to the grating period of the first exit pupil region, and is the grating period of the first expansion pupil regionDoubling; the grating period of the second sub-region of the entrance pupil region is equal to the grating period of the second exit pupil region and is +.>Multiple times.
2. The large field left and right dichroic dual channel waveguide as set forth in claim 1, wherein the angle of view of the large field color light source is 40 ° -50 °.
3. The large-field left-right color separation dual-channel waveguide according to claim 1, wherein the bandwidth of the blue light cut-off filter is 420-480 nm or 440-460 nm, and the bandwidth of the red light cut-off filter is 590-640 nm or 620-630 nm.
4. The large field left and right dichroic dual path waveguide according to claim 1, wherein the entrance pupil area, the first pupil expansion area, the second pupil expansion area, the first exit pupil area, and the second exit pupil area all employ diffraction gratings, which are surface relief gratings or volume hologram gratings.
5. The large-field left-right dichroic dual-channel waveguide as set forth in claim 4, wherein the entrance pupil area is perpendicular to the grating directions of the first exit pupil area and the second exit pupil area, and the entrance pupil area has an included angle of 40 ° to 50 ° with the grating directions of the first expansion pupil area and the second expansion pupil area.
6. The large field-of-view left-right dichroic dual path waveguide according to claim 4, wherein a vector sum of a grating period and a grating direction of the grating vectors of the entrance pupil region, the first pupil expansion region, the second pupil expansion region, the first exit pupil region, and the second exit pupil region is 0.
7. The large field of view left and right dichroic dual channel waveguide of claim 1, wherein the waveguide is a left and right eye integrated butterfly waveguide having a waveguide refractive index of 2.0.
8. An AR glasses, wherein the large-field left-right dichroic dual-channel waveguide according to any one of claims 1 to 7 is used.
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| US10241332B2 (en) * | 2015-10-08 | 2019-03-26 | Microsoft Technology Licensing, Llc | Reducing stray light transmission in near eye display using resonant grating filter |
| US10911743B2 (en) * | 2018-10-19 | 2021-02-02 | Facebook Technologies, Llc | Field of view expansion by color separation |
| CN113219671A (en) * | 2021-05-25 | 2021-08-06 | 深圳市光舟半导体技术有限公司 | Optical device and display apparatus |
| CN113253465A (en) * | 2021-06-11 | 2021-08-13 | 深圳市光舟半导体技术有限公司 | Waveguide assembly and folding AR eyepiece with front-mounted optical machine |
| CN113687512B (en) * | 2021-08-17 | 2024-02-13 | 深圳市光舟半导体技术有限公司 | AR glasses |
| CN113687514A (en) * | 2021-08-30 | 2021-11-23 | 深圳市光舟半导体技术有限公司 | Colored AR glasses |
| CN113721362B (en) * | 2021-09-03 | 2023-01-31 | 深圳市光舟半导体技术有限公司 | Optical pupil expanding device, display device, light beam expanding method and image display method |
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