CN113866899A - Optical transmission system, preparation method thereof and display device - Google Patents
Optical transmission system, preparation method thereof and display device Download PDFInfo
- Publication number
- CN113866899A CN113866899A CN202111144600.1A CN202111144600A CN113866899A CN 113866899 A CN113866899 A CN 113866899A CN 202111144600 A CN202111144600 A CN 202111144600A CN 113866899 A CN113866899 A CN 113866899A
- Authority
- CN
- China
- Prior art keywords
- light
- grating
- optical waveguide
- transmission system
- coupling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 167
- 230000005540 biological transmission Effects 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title description 5
- 238000002955 isolation Methods 0.000 claims abstract description 41
- 238000010168 coupling process Methods 0.000 claims abstract description 35
- 238000005859 coupling reaction Methods 0.000 claims abstract description 35
- 230000008878 coupling Effects 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 230000001427 coherent effect Effects 0.000 claims description 102
- 239000011248 coating agent Substances 0.000 claims description 23
- 238000000576 coating method Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 16
- 230000001154 acute effect Effects 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000003190 augmentative effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000008030 elimination Effects 0.000 description 4
- 238000003379 elimination reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 208000003464 asthenopia Diseases 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000001093 holography Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000003909 pattern recognition Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/34—Optical coupling means utilising prism or grating
-
- 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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
-
- 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
- G02B2027/0174—Head mounted characterised by optical features holographic
Abstract
The present disclosure provides an optical transmission system, a method of manufacturing the same, and a display device, the optical transmission system being configured to transmit incident light including image light and zero-order light, the optical transmission system including: the optical waveguide, set up in the coupling-in grating and coupling-out grating on the surface of the optical waveguide; the coupling grating is used for coupling incident light into the optical waveguide and converging the incident light; the optical waveguide is used for enabling incident light rays coupled into the optical waveguide to generate total reflection; the coupling-out grating comprises a diffraction region and an isolation region, wherein the diffraction region is used for coupling the image light in the optical waveguide out of the optical waveguide, and the isolation region is used for enabling the zero-order light in the optical waveguide to be continuously and totally reflected so as to enable the zero-order light to be emitted out of the optical transmission system at an angle except the field angle of the optical transmission system. The zero-order eliminating image reproduction can be realized, compared with the related technology, the display effect is better, the volume and the weight of the system are greatly reduced, the lightening is realized, and the head-mounted display system is suitable for head-mounted display.
Description
Technical Field
The disclosure relates to the field of optical technologies, and in particular, to an optical transmission system, a manufacturing method thereof, and a display device.
Background
With the improvement of computer performance and the development of optoelectronic devices, Spatial Light Modulators (SLM) can modulate the amplitude, phase, frequency, etc. of optical waves, and are widely used in optical measurement, pattern recognition, fringe projection, holography and dynamic display, and the advantage of SLM-based computer-generated holography display is increasingly highlighted.
In a computer-generated holographic display, loading a digital lens on the SLM not only simplifies the reconstruction system, but also enables control of the reconstruction position. However, the superposition of the zero order spot and the reconstructed image produced by the digital lens can seriously affect the quality of the reconstructed image.
Disclosure of Invention
The disclosure provides an optical transmission system, a preparation method thereof and a display device, so as to eliminate zero-order light.
The present disclosure provides an optical transmission system for transmitting incident light including image light and zero-order light, the optical transmission system including: the optical waveguide, set up in coupling-in grating and coupling-out grating on the surface of said optical waveguide;
the coupling grating is used for coupling the incident light into the optical waveguide and converging the incident light;
the optical waveguide is used for enabling incident light rays coupled into the optical waveguide to generate total reflection;
the coupling-out grating comprises a diffraction region and an isolation region, wherein the diffraction region is used for coupling the image light in the optical waveguide out of the optical waveguide, and the isolation region is used for enabling the zero-order light in the optical waveguide to be continuously subjected to total reflection so as to enable the zero-order light to be emitted out of the optical transmission system at an angle except the field angle of the optical transmission system.
In an alternative implementation, the zero-order light is incident on the optical transmission system perpendicular to the surface of the optical waveguide.
In an optional implementation manner, when the zero-order light is incident to the plane where the coupling grating is located, a zero-order light spot is formed, and the isolation region covers the zero-order light spot.
In an optional implementation manner, the image light is a 3D image light, and the incoupling grating and the outcoupling grating are both volume holographic gratings.
In an alternative implementation manner, if the incoupling grating is a reflective grating, the incoupling grating is located on a side of the optical waveguide, which is away from the incident side of the incident light;
if the incoupling grating is a transmission grating, the incoupling grating is located on one side of the optical waveguide, which is close to the incident light.
In an optional implementation manner, if the outcoupling grating is a reflective grating, the outcoupling grating is located on a side of the optical waveguide deviating from the incident side of the incident light;
if the coupling-out grating is a transmission grating, the coupling-out grating is positioned on one side of the optical waveguide, which is close to the incident light.
In an alternative implementation, the diffraction orders of the image light diffracted by the incoupling grating and the outcoupling grating are the same.
In an alternative implementation, the grating periods of the in-coupling grating and the out-coupling grating are the same.
In an alternative implementation manner, the incident light enters the plane of the incoupling grating to form an overlapping region, and the incoupling grating covers the overlapping region.
The present disclosure provides a display device including: a spatial light modulator and an optical transmission system as claimed in any one of the preceding claims;
wherein the spatial light modulator is configured to emit the image light and the zero-order light to the optical transmission system.
In an optional implementation manner, the spatial light modulator and the light emitted from the coupling grating are located on the same side of the optical transmission system.
The present disclosure provides a method for manufacturing an optical transmission system, for manufacturing any one of the optical transmission systems, the method comprising:
coating a photosensitive coating on the surface of the optical waveguide;
irradiating mutually coherent first coherent light and second coherent light to the position on the photosensitive coating corresponding to the coupling grating; irradiating mutually coherent third coherent light and fourth coherent light to the position, corresponding to the diffraction region of the coupling grating, on the photosensitive coating, wherein the third coherent light is incident on the photosensitive coating to form a first region, the fourth coherent light is incident on the photosensitive coating to form a second region, and the first region and/or the second region are/is not overlapped with the isolation region;
and processing the irradiated photosensitive coating to form the coupling-in grating and the coupling-out grating on the surface of the optical waveguide.
In an optional implementation manner, the first coherent light is a focused light beam, the second coherent light is a planar light beam, the first coherent light and the second coherent light are respectively incident from two opposite sides of the optical waveguide, an incident angle of the first coherent light is an acute angle, and the second coherent light is perpendicular to a surface of the optical waveguide.
In an optional implementation manner, the third coherent light is a focused light beam, the fourth coherent light is a planar light beam, the third coherent light and the fourth coherent light are respectively incident from two opposite sides of the optical waveguide, the third coherent light is perpendicular to a surface of the optical waveguide, and an incident angle of the fourth coherent light is an acute angle.
In an alternative implementation, the first coherent light, the second coherent light, the third coherent light, and the fourth coherent light have the same wavelength as the image light.
Compared with the prior art, the present disclosure includes the following advantages:
according to the optical transmission system, the preparation method thereof and the display device, the isolation area and the diffraction area are arranged on the coupling-out grating, the zero-order light rays are continuously and totally reflected through the isolation area and are emitted at an angle outside the range of the field angle, and the image light rays are coupled out of the optical waveguide through the diffraction area and are emitted at an angle within the range of the field angle, so that the separation of the zero-order light rays and the image light rays is realized, the image reproduction of eliminating the zero order is realized, and the quality of the reproduced image is improved. In addition, the incoupling grating has a focusing function on image light, the intensity of the image light in a field angle range can be improved, the incoupling grating has a focusing function on zero-order light, the irradiation range of the zero-order light on the incoupling grating can be reduced, the zero-order light can enter an isolation region as much as possible, and the zero-order light can be completely eliminated.
According to the technical scheme, the coupling-in grating and the coupling-out grating are arranged on the surface of the optical waveguide, functions of various traditional optical elements such as a beam splitter prism and a zero-order filter device can be achieved, zero-order eliminating image reproduction can be achieved without arranging the traditional optical elements, compared with the related art, the display effect is better, the size and the weight of the system are greatly reduced, the system is lighter and more convenient, and the system is very suitable for head-mounted display.
The foregoing description is only an overview of the technical solutions of the present disclosure, and the embodiments of the present disclosure are described below in order to make the technical means of the present disclosure more clearly understood and to make the above and other objects, features, and advantages of the present disclosure more clearly understandable.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. It should be noted that the scale in the drawings is merely schematic and does not represent actual scale.
FIG. 1 is a schematic diagram of an augmented reality display system with zero elimination in the related art;
FIG. 2 schematically illustrates a structural schematic of an optical transmission system;
FIG. 3 is a schematic diagram of a method of fabricating an optical transmission system to produce in-coupling gratings and out-coupling gratings;
FIG. 4 is a schematic diagram of a method of making an optical transmission system to produce an incoupling grating;
FIG. 5 is a schematic diagram of a method of making an optical transmission system to produce a coupled-out grating;
FIG. 6 schematically illustrates a flow chart of a method of making an optical transmission system;
fig. 7 schematically shows a structural diagram of a display device.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
In order to eliminate the zero-order spot and improve the quality of the reproduced image, in the related art, as shown in fig. 1, the augmented reality display system generally includes a Beam Splitter (BS), a Computer Generated Hologram (CGH), a Spatial Light Modulator (SLM), a zero-order eliminating device, an eyepiece, and a virtual-real fusion device. The spatial light modulator is used for emitting image light and zero-order light, the zero-order device can focus the zero-order light on a back focal plane of the lens, then the zero-order light is completely shielded through the high-pass filter, and only the image light passes through the zero-order device, so that image reproduction of zero-order elimination is achieved. Although this system can eliminate zero-order light, it is relatively complicated, uses many optical elements, and is difficult to realize a lightweight head-mounted flat panel display.
To eliminate zero order light, the present disclosure provides an optical transmission system, as shown in fig. 2, for transmitting incident light rays, including image light rays 101 and zero order light rays 102.
Referring to fig. 2, the optical transmission system includes: an optical waveguide 11, an incoupling grating 12 and an outcoupling grating 13 arranged on the surface of the optical waveguide 11.
The incoupling grating 12 is used for coupling incident light into the optical waveguide 11 and converging the incident light.
The optical waveguide 11 is used to generate total reflection of the incident light coupled therein.
The coupling grating 13 includes a diffraction region 131 and an isolation region 132, the diffraction region 131 is used for coupling the image light 101 in the optical waveguide 11 out of the optical waveguide 11, and the isolation region 132 is used for making the zero-order light 102 in the optical waveguide 11 continue to be totally reflected, so that the zero-order light 102 exits the optical transmission system at an angle other than the field angle of the optical transmission system.
In this embodiment, the incoupling grating 12 can couple and focus the zero-order light, the zero-order light 102 is totally reflected in the optical waveguide 11 and is incident on the isolation region 132 of the outcoupling grating 13, the isolation region 132 has no grating pattern, the zero-order light 102 is not diffracted by the isolation region 132 and is continuously totally reflected in the optical waveguide 11, and then can be emitted from the side surface b of the optical waveguide 11, so that the zero-order light 102 is emitted out of the optical transmission system at an angle other than the field angle of the optical transmission system, and thus the zero-order light 102 is prevented from entering human eyes. The field angle may be an angular range in which the image light 101 exits the optical transmission system.
The incoupling grating 12 can couple and focus the image light 101, the image light 101 is totally reflected in the optical waveguide 11 and is incident on the diffraction region 131 of the outcoupling grating 13, the diffraction region 131 has a grating pattern, and the image light 101 is diffracted by the diffraction region 131 and is coupled out of the optical waveguide 11 to enter the human eye. The angle at which image light rays 101 exit the optical transmission system may be within the field angle range.
Thus, the separation of the zero-order light ray 102 and the image light ray 101 can be realized, the image reproduction of zero-order elimination can be realized, and the quality of the reproduced image can be improved.
In the optical transmission system provided by this embodiment, by providing the isolation region 132 and the diffraction region 131 on the coupling-out grating 13, the zero-order light 102 is continuously and totally reflected by the isolation region 132 and emitted at an angle outside the field angle range, and the image light 101 is coupled out of the optical waveguide 11 by the diffraction region 131 and emitted at an angle within the field angle range, so that the separation of the zero-order light 102 and the image light 101 is realized, the image reproduction of the zeroth order is realized, and the quality of the reproduced image is improved. In addition, the incoupling grating 12 has a focusing effect on the image light 101, which can improve the intensity of the image light 101 within the field angle range, and the incoupling grating 12 has a focusing effect on the zero-order light 102, which can reduce the irradiation range of the zero-order light 102 on the outcoupling grating 13, so that the zero-order light 102 enters the isolation region 132 as much as possible, which is helpful to completely eliminate the zero-order light 102.
In this embodiment, the incoupling grating 12 and the outcoupling grating 13 are disposed on the surface of the optical waveguide 11, so that functions of various conventional optical elements such as a beam splitter prism and a zero-order filter device can be realized, and zero-order elimination image reproduction can be realized without disposing the conventional optical elements.
In a specific implementation, the position of the isolation region 132 may be determined according to an imaging effect, when the isolation region 132 is designed, the isolation region 132 may be moved in a horizontal direction, and when the imaging effect is clearest, the position of the isolation region 132 may be determined. The location of the isolation region 132 is related to the thickness of the optical waveguide, the angle of the incident light, and other factors, and is not particularly limited by the present disclosure.
In the present embodiment, the incoupling grating 12 has a function of recording an image, and the outcoupling grating 13 has a function of reproducing an image.
In this embodiment, the coupling-in grating 12 may be a surface relief grating or a volume holographic grating, which is not limited in this embodiment.
In this embodiment, the coupling-out grating 13 may be a surface relief grating or a volume holographic grating, which is not limited in this embodiment.
In practical applications, a total reflection critical angle at which the incident light propagates in the optical waveguide 11 can be determined according to the refractive index of the optical waveguide 11, and grating parameters of the coupling grating 12 can be designed according to the total reflection critical angle and an angle interval in which the incident light irradiates the coupling grating 12, so that the incident light in the angle interval can be totally reflected in the optical waveguide 11 after passing through the coupling grating 12. Wherein the grating parameters may include at least one of: refractive index, duty cycle, grating height, tilt angle, grating period, and the like.
In a specific implementation, the grating periods of the incoupling grating 12 and the outcoupling grating 13 may be the same, which is not limited in this embodiment.
In a specific implementation, because the grating has angle selectivity and wavelength selectivity, when the coupling grating 13 is designed, the image light 101 can meet the bragg matching condition, and the image light 101 is diffracted through the coupling grating 13; and the ambient light does not satisfy the bragg matching condition, and the ambient light can directly enter human eyes through the coupling grating 13, so that the fusion of the ambient light and the image light 101 is realized, and the augmented reality display effect is formed.
In this embodiment, as shown in fig. 2, the zero-order light ray 102 may be incident on the optical transmission system perpendicular to the surface of the optical waveguide 11, which is not limited in this disclosure.
In order to completely eliminate the zero-order light, in an alternative implementation, the zero-order light 102 forms a zero-order spot when entering the plane where the coupling grating 13 is located, and the isolation region 132 covers the zero-order spot.
Alternatively, when the zero-order light 102 focused in the optical waveguide 11 is incident on the plane of the coupling-out grating 13, the focus of the zero-order light 102 may be located in the isolation region 132 of the coupling-out grating 13, which helps to completely eliminate the zero-order light 102.
The inventor finds that most of the current augmented reality display products on the market are 2D display or binocular parallax 3D display technology with visual fatigue is used.
In order to realize 3D display without visual fatigue, in an alternative implementation, the image light 101 may be 3D image light 101, and the incoupling grating 12 and the outcoupling grating 13 are both volume holographic gratings.
Wherein the volume holographic grating is a holographic optical element. Holographic optical elements are optical elements made according to the principles of holography, usually on a photosensitive film material. Unlike the conventional optical element based on the principle of reflection or refraction, the holographic optical element is based on the principle of diffraction, and is a diffractive optical element. Because the holographic optical element is only a layer of film, the volume and the weight are greatly reduced compared with the traditional optical element. Meanwhile, the holographic optical element can perform optical multiplexing, record a plurality of holograms, and realize integration of multiple functions, so that the volume of the system can be further reduced.
In the implementation mode, not only can 3D display without visual fatigue be realized, but also the volume and the weight of the system can be reduced.
In the present embodiment, the incoupling grating 12 may be disposed on a surface of the optical waveguide 11 on a side away from the incident light, or on a surface of the optical waveguide 11 on a side close to the incident light. Specifically, if the incoupling grating 12 is a reflective grating, the incoupling grating 12 is located on the side of the optical waveguide 11 away from the incident light; if the incoupling grating 12 is a transmissive grating, the incoupling grating 12 is located on the side of the light guide 11 near the incident light.
In the present embodiment, the coupling-out grating 13 may be disposed on a surface of the optical waveguide 11 on a side away from the incident light, or on a surface of the optical waveguide 11 on a side close to the incident light. Specifically, if the coupling-out grating 13 is a reflective grating, the coupling-out grating 13 is located on a side of the optical waveguide 11 away from the incident light; if the coupling grating 13 is a transmissive grating, the coupling grating 13 is located on the side of the optical waveguide 11 near the incident light.
The incoupling grating 12 and the outcoupling grating 13 may both be arranged on a surface of the light guide 11 on a side close to the incidence of the incident light, or both be arranged on a surface of the light guide 11 on a side away from the incidence of the incident light, or one of them may be arranged on a surface of the light guide 11 on a side close to the incidence of the incident light and the other on a surface of the light guide 11 on a side away from the incidence of the incident light.
As shown in fig. 2, the incoupling grating 12 and the outcoupling grating 13 are reflective gratings and are disposed on the surface of the light guide 11 facing away from the incident light.
As shown in fig. 2, the coupling-in grating 12 may be disposed near an end surface a of the optical waveguide 11, and the coupling-out grating 13 may be disposed near an end surface b, the end surface a and the end surface b being disposed opposite to each other. The end face a connects a surface of the optical waveguide 11 on a side close to the image light 101 and a surface of the optical waveguide 11 on a side away from the image light 101, and the end face b connects a surface of the optical waveguide 11 on a side close to the image light 101 and a surface of the optical waveguide 11 on a side away from the image light 101.
The diffraction orders of the image light 101 diffracted by the incoupling grating 12 and the outcoupling grating 13 are the same. For example, the diffraction orders may be all 1 st order or-1 st order, and the specific diffraction order may be determined according to the diffraction efficiency.
The incident light forms an overlap region when incident on the plane where the incoupling grating 12 is located, and the incoupling grating 12 covers the overlap region. When the incident light of each angle is incident on the plane where the incoupling grating 12 is located, an overlapping area is formed, and when the incoupling grating 12 covers the overlapping area, the image light 101 of each angle can be received, thereby ensuring that the human eye can see a complete image in the field angle range.
The present disclosure also provides a display device, which includes, with reference to fig. 7: a spatial light modulator 71 and an optical transmission system 72 as provided in any of the embodiments.
The spatial light modulator 71 is configured to emit image light 101 and zero-order light 102 to the optical transmission system 72.
Since the display device is more lightweight using the zeroth-order-eliminating optical transmission system 72, a head-mounted display system can be realized. In this embodiment, the display device may be an augmented reality display device.
In an alternative implementation, the spatial light modulator 71 is located on the same side of the optical transmission system 72 as the image light exiting the outcoupling grating 13. The spatial light modulator 71 and the field of view of human eyes (i.e. the side of the coupled grating 13 emitting image light) are arranged on the same side of the optical transmission system 72, so that the display device better conforms to the structure of glasses, wherein the spatial light modulator 71 can be positioned at the position of the glasses legs, which is convenient for preparing an augmented reality display device more conforming to the wearing habits of users. Of course, the spatial light modulator 71 and the field of view of human eyes may be located on the opposite side of the optical transmission system 72, and this embodiment is not limited thereto as the case may be.
The present disclosure also provides a method for manufacturing an optical transmission system, which can be used to manufacture the optical transmission system provided in any of the above embodiments. Referring to fig. 6 and 3, the preparation method includes:
step 61: a photosensitive coating 31 is applied to the surface of the optical waveguide 11.
Step 62: irradiating mutually coherent first coherent light L01 and second coherent light L02 to the position corresponding to the coupled grating on the photosensitive coating 31; the third coherent light L03 and the fourth coherent light L04, which are mutually coherent, are irradiated to the position on the photosensitive coating 31 corresponding to the diffraction region of the coupled-out grating, the third coherent light L03 is incident on the photosensitive coating 31 to form a first region, the fourth coherent light L04 is incident on the photosensitive coating 31 to form a second region, and the first region and/or the second region are/is not overlapped with the isolation region 132.
Alternatively, a blocking piece 32 may be disposed at a position corresponding to the isolation region on the side where the third coherent light L03 is incident, so that the first region does not overlap with the isolation region, that is, the isolation region is not irradiated by the third coherent light L03, thereby preventing the third coherent light L03 and the fourth coherent light L04 from interfering in the isolation region and forming interference fringes.
In a specific implementation, the shielding block 32 may be further disposed on a side where the fourth coherent light L04 is incident, so that the second region does not overlap with the isolation region 132, that is, there is no irradiation of the fourth coherent light L04 in the isolation region, thereby preventing the third coherent light L03 and the fourth coherent light L04 from interfering in the isolation region, and avoiding forming interference fringes.
The blocking blocks 32 can be further disposed on the incident sides of the third coherent light L03 and the fourth coherent light L04, respectively, so that the first region and the second region are both non-overlapped with the isolation region 132, i.e., there is no irradiation of the third coherent light L03 and the fourth coherent light L04 in the isolation region, thereby preventing the third coherent light L03 and the fourth coherent light L04 from interfering in the isolation region and forming interference fringes.
The first coherent light L01 and the second coherent light L02 are mutually coherent light, and they can interfere with each other at a position on the photosensitive coating 31 corresponding to the coupled grating. The third coherent light L03 and the fourth coherent light L04 are coherent lights, and they may interfere at a position on the photosensitive coating 31 corresponding to the diffraction region of the outcoupling grating.
The wavelengths of the first coherent light L01, the second coherent light L02, the third coherent light L03, and the fourth coherent light L04 may be the same as the wavelength of the image light 101.
And step 63: the irradiated photosensitive coating 31 is treated to form an incoupling grating 12 and an outcoupling grating 13 on the surface of the optical waveguide 11.
Specifically, the photosensitive coating 31 after irradiation may be subjected to development and fixing processes, thereby forming the incoupling grating 12 and the outcoupling grating 13 on the surface of the optical waveguide 11, as shown in fig. 2.
As shown in fig. 3, the first coherent light L01 can be a focused light beam, and the second coherent light L02 is a planar light beam. The first coherent light L01 and the second coherent light L02 may be incident from opposite sides of the optical waveguide 11, respectively.
The incident angle of the first coherent light L01 may be an acute angle, i.e. the angle between the first coherent light L01 and the surface of the light waveguide 11 is greater than 0 ° and less than 90 °.
The second coherent light L02 may be perpendicular to the surface of the optical waveguide 11. I.e. the angle between the second coherent light L02 and the surface of the optical waveguide 11 is 90 deg..
In a specific implementation, the obliquely incident focused light beam, i.e., the first coherent light beam L01 interferes with the perpendicularly incident plane wave, i.e., the second coherent light beam L02, thereby completing the recording on the coupled-in grating 12.
To obtain the first coherent light L01, as shown in fig. 4, the original light L05 including a plurality of wavelengths may be irradiated onto a triangular prism, and the wavelength screening and the incident angle adjustment may be performed by the triangular prism.
As shown in fig. 3, the third coherent light L03 can be a focused light beam, and the fourth coherent light L04 can be a planar light beam. The third coherent light L03 and the fourth coherent light L04 are incident from opposite sides of the optical waveguide 11, respectively.
The incident angle of the fourth coherent light L04 is acute, that is, the included angle between the fourth coherent light L04 and the surface of the light guide 11 is greater than 0 ° and less than 90 °.
The third coherent light L03 is perpendicular to the surface of the light guide 11, which means that the angle between the central ray of the third coherent light L03 and the surface of the light guide 11 is 90 °.
In a specific implementation, the obliquely incident plane wave, i.e., the fourth coherent light L04 interferes with the perpendicularly incident focused light wave, i.e., the third coherent light L03, at a position corresponding to the diffraction region 131, and a blocking block 32 may be disposed at a position corresponding to the isolation region to prevent interference fringes from being formed in the isolation region 132, thereby completing the recording of the coupled-out grating 13.
To obtain the fourth coherent light L04, as shown in fig. 5, the original light L06 including a plurality of wavelengths may be irradiated onto a triangular prism, and the wavelength screening and the incident angle adjustment may be performed by the triangular prism.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The optical transmission system, the manufacturing method thereof, and the display device provided by the present disclosure are described in detail above, and specific examples are applied herein to illustrate the principles and embodiments of the present disclosure, and the description of the above embodiments is only used to help understand the method and the core idea of the present disclosure; meanwhile, for a person skilled in the art, based on the idea of the present disclosure, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present disclosure should not be construed as a limitation to the present disclosure.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Reference herein to "one embodiment," "an embodiment," or "one or more embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Moreover, it is noted that instances of the word "in one embodiment" are not necessarily all referring to the same embodiment.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.
Claims (15)
1. An optical transmission system for transmitting incident light including image light and zero-order light, the optical transmission system comprising: the optical waveguide, set up in coupling-in grating and coupling-out grating on the surface of said optical waveguide;
the coupling grating is used for coupling the incident light into the optical waveguide and converging the incident light;
the optical waveguide is used for enabling incident light rays coupled into the optical waveguide to generate total reflection;
the coupling-out grating comprises a diffraction region and an isolation region, wherein the diffraction region is used for coupling the image light in the optical waveguide out of the optical waveguide, and the isolation region is used for enabling the zero-order light in the optical waveguide to be continuously subjected to total reflection so as to enable the zero-order light to be emitted out of the optical transmission system at an angle except the field angle of the optical transmission system.
2. The optical transmission system according to claim 1, wherein the zero-order light is incident on the optical transmission system perpendicularly to a surface of the optical waveguide.
3. The optical transmission system according to claim 1, wherein the zero-order light forms a zero-order spot when incident on the plane where the coupling grating is located, and the isolation region covers the zero-order spot.
4. The optical transmission system of claim 1, wherein the image light is 3D image light, and the incoupling grating and the outcoupling grating are volume holographic gratings.
5. An optical transmission system according to any one of claims 1 to 4, wherein if the incoupling grating is a reflective grating, the incoupling grating is located on a side of the optical waveguide that faces away from the incident light;
if the incoupling grating is a transmission grating, the incoupling grating is located on one side of the optical waveguide, which is close to the incident light.
6. An optical transmission system according to any one of claims 1 to 4, wherein if the outcoupling grating is a reflective grating, the outcoupling grating is located on a side of the optical waveguide that is away from the incident side of the incident light;
if the coupling-out grating is a transmission grating, the coupling-out grating is positioned on one side of the optical waveguide, which is close to the incident light.
7. An optical transmission system as claimed in any one of claims 1 to 4, wherein the image light is diffracted in the same order by the incoupling grating and the outcoupling grating.
8. Optical transmission system according to one of claims 1 to 4, characterized in that the grating periods of the in-coupling grating and the out-coupling grating are the same.
9. An optical transmission system as claimed in any one of claims 1 to 4, wherein the incident light forms an overlap region when incident on the plane of the incoupling grating, and the incoupling grating covers the overlap region.
10. A display device, comprising: a spatial light modulator and an optical transmission system as claimed in any one of claims 1 to 9;
wherein the spatial light modulator is configured to emit the image light and the zero-order light to the optical transmission system.
11. The display device as claimed in claim 10, wherein the spatial light modulator and the light exiting from the coupling grating are located on the same side of the optical transmission system.
12. A method for producing an optical transmission system, for producing the optical transmission system according to any one of claims 1 to 9, comprising:
coating a photosensitive coating on the surface of the optical waveguide;
irradiating mutually coherent first coherent light and second coherent light to the position on the photosensitive coating corresponding to the coupling grating; irradiating mutually coherent third coherent light and fourth coherent light to the position, corresponding to the diffraction region of the coupling grating, on the photosensitive coating, wherein the third coherent light is incident on the photosensitive coating to form a first region, the fourth coherent light is incident on the photosensitive coating to form a second region, and the first region and/or the second region are/is not overlapped with the isolation region;
and processing the irradiated photosensitive coating to form the coupling-in grating and the coupling-out grating on the surface of the optical waveguide.
13. The method of claim 12, wherein the first coherent light is a focused light beam, the second coherent light is a planar light beam, the first coherent light and the second coherent light are incident from two opposite sides of the optical waveguide, respectively, an incident angle of the first coherent light is an acute angle, and the second coherent light is perpendicular to a surface of the optical waveguide.
14. The method according to claim 12, wherein the third coherent light beam is a focused light beam, the fourth coherent light beam is a planar light beam, the third coherent light beam and the fourth coherent light beam are incident from two opposite sides of the optical waveguide, respectively, the third coherent light beam is perpendicular to a surface of the optical waveguide, and an incident angle of the fourth coherent light beam is an acute angle.
15. The method of claim 12, wherein the first coherent light, the second coherent light, the third coherent light, and the fourth coherent light have the same wavelength as the image light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111144600.1A CN113866899A (en) | 2021-09-28 | 2021-09-28 | Optical transmission system, preparation method thereof and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111144600.1A CN113866899A (en) | 2021-09-28 | 2021-09-28 | Optical transmission system, preparation method thereof and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113866899A true CN113866899A (en) | 2021-12-31 |
Family
ID=78991924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111144600.1A Pending CN113866899A (en) | 2021-09-28 | 2021-09-28 | Optical transmission system, preparation method thereof and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113866899A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1443305A (en) * | 2000-07-21 | 2003-09-17 | 维尔有限公司 | Coupling elements for surface plasmon resonance sensors |
| CN101017218A (en) * | 2007-02-14 | 2007-08-15 | 苏州大学 | Photoconductive coating film of diffraction grating and manufacture method thereof |
| CN111781724A (en) * | 2017-02-28 | 2020-10-16 | 华为技术有限公司 | Information display equipment and information display method |
| CN212694110U (en) * | 2020-09-25 | 2021-03-12 | 杭州光粒科技有限公司 | Diffraction light waveguide display device and system |
| US20210223461A1 (en) * | 2019-02-28 | 2021-07-22 | Boe Technology Group Co., Ltd. | Optical waveguide and display device |
-
2021
- 2021-09-28 CN CN202111144600.1A patent/CN113866899A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1443305A (en) * | 2000-07-21 | 2003-09-17 | 维尔有限公司 | Coupling elements for surface plasmon resonance sensors |
| CN101017218A (en) * | 2007-02-14 | 2007-08-15 | 苏州大学 | Photoconductive coating film of diffraction grating and manufacture method thereof |
| CN111781724A (en) * | 2017-02-28 | 2020-10-16 | 华为技术有限公司 | Information display equipment and information display method |
| US20210223461A1 (en) * | 2019-02-28 | 2021-07-22 | Boe Technology Group Co., Ltd. | Optical waveguide and display device |
| CN212694110U (en) * | 2020-09-25 | 2021-03-12 | 杭州光粒科技有限公司 | Diffraction light waveguide display device and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11733519B2 (en) | Optical systems having light homogenization structures | |
| Kim et al. | Holographic optical elements and application | |
| CN109642716B (en) | Virtual reality, augmented reality, and mixed reality systems including thick media and related methods | |
| Piao et al. | Full color holographic optical element fabrication for waveguide-type head mounted display using photopolymer | |
| EP1347314B1 (en) | Holographic optical devices | |
| CN111201476B (en) | Two-dimensional light homogenization | |
| TW201300972A (en) | Method and device for the layered production of thin volume grid stacks, and beam combiner for a holographic display | |
| JP2002049292A (en) | Method for manufacturing transmission type hologram | |
| EP3444527B1 (en) | Light guide plate, backlight unit, and holographic display apparatus including the backlight unit | |
| CN111474724A (en) | Holographic optical waveguide device for three-dimensional dynamic display and augmented reality display equipment | |
| KR20190023921A (en) | Backlight unit including input coupler, holographic display apparatus including the backlight unit, and method of manufacturing the input coupler | |
| KR20180065421A (en) | backlight unit and holographic display apparatus including the same | |
| US20220196900A1 (en) | Backlight unit and holographic display apparatus including the same | |
| US4968108A (en) | Method for constructing and reconstructing hologram | |
| CN112859334A (en) | Near-to-eye display device and AR glasses | |
| CN113866899A (en) | Optical transmission system, preparation method thereof and display device | |
| KR20080018136A (en) | Security hologram, method of recording same, and method of using same | |
| US4392709A (en) | Method of manufacturing holographic elements for fiber and integrated optic systems | |
| KR20140027812A (en) | Phase mask and holographic recording apparatus employing the same | |
| Ha et al. | A Study on Augmented 3D Display Optimization Based on Holographic Optical Element for High Depth and Magnified Image | |
| US6222651B1 (en) | Holographic resonant system and method | |
| KR102264211B1 (en) | AR Holographic Display using Optical Waveguide and HOE | |
| JP3247366B2 (en) | Hologram using evanescent wave and method for producing the same | |
| EP4089466A1 (en) | Waveguide | |
| JP2024031622A (en) | Hologram optical element manufacturing device, hologram optical element manufacturing method, and hologram optical element |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |