CN113075768A - Optical waveguide structure and vehicle-mounted head-up display - Google Patents
Optical waveguide structure and vehicle-mounted head-up display Download PDFInfo
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- CN113075768A CN113075768A CN202110506050.7A CN202110506050A CN113075768A CN 113075768 A CN113075768 A CN 113075768A CN 202110506050 A CN202110506050 A CN 202110506050A CN 113075768 A CN113075768 A CN 113075768A
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- 210000001747 pupil Anatomy 0.000 claims description 4
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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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/34—Optical coupling means utilising prism or grating
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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
- G02B27/0101—Head-up displays characterised by optical features
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Abstract
The invention provides an optical waveguide structure and a vehicle-mounted head-up display. The optical waveguide structure includes: an optical waveguide sheet; the coupling grating is arranged on one side surface of the optical waveguide sheet and couples light emitted by an external light source component into the optical waveguide sheet; the coupling-out grating is arranged on the other side surface of the optical waveguide sheet, is used for receiving light coupled into the grating and couples the light out of the optical waveguide sheet; and the reflecting structure is arranged on the coupling-out grating and used for reflecting the light which is coupled out of the coupling-out grating and does not enter human eyes back to the optical waveguide sheet. The invention solves the problem of poor imaging effect of the optical waveguide structure in the prior art.
Description
Technical Field
The invention relates to the technical field of optical imaging equipment, in particular to an optical waveguide structure and a vehicle-mounted head-up display.
Background
The types of optical imaging apparatuses are various. With the continuous development of science and technology, Virtual Reality (VR), Augmented Reality (AR), and Mixed Reality (MR) have entered into the lives of people, wherein in the aspect of AR augmented reality, an optical imaging apparatus includes not only a head-mounted glasses apparatus but also a head-up display (HUD) in an automobile. For the augmented reality technology, the optical waveguide structure is an indispensable part, but the display effect of the current optical waveguide structure is not ideal enough, and the light source is introduced into the optical waveguide structure and consumes a large amount of energy when transmitting in the optical waveguide structure, thereby affecting the display effect.
That is, the optical waveguide structure in the related art has a problem of poor imaging effect.
Disclosure of Invention
The invention mainly aims to provide an optical waveguide structure and a vehicle-mounted head-up display, and aims to solve the problem that the optical waveguide structure in the prior art is poor in imaging effect.
In order to achieve the above object, according to one aspect of the present invention, there is provided an optical waveguide structure comprising: an optical waveguide sheet; the coupling grating is arranged on one side surface of the optical waveguide sheet and couples light emitted by an external light source component into the optical waveguide sheet; the coupling-out grating is arranged on the other side surface of the optical waveguide sheet, is used for receiving light coupled into the grating and couples the light out of the optical waveguide sheet; and the reflecting structure is arranged on the coupling-out grating and used for reflecting the light which is coupled out of the coupling-out grating and does not enter human eyes back to the optical waveguide sheet.
Further, the projection of the incoupling grating on the optical waveguide sheet does not coincide with the projection of the outcoupling grating on the optical waveguide sheet.
Further, the reflective structure is a metal film.
Further, the material of the metal film includes one of Al, Ag, Cu, and Au.
Further, the thickness of the reflecting structure is greater than or equal to 1 micron and less than or equal to 100 microns.
Furthermore, the optical waveguide structure further comprises a turning grating which is arranged on the optical waveguide sheet and is positioned on the same side surface of the optical waveguide sheet as the coupling grating, the turning grating is used for receiving the light of the coupling grating, and the coupling grating is used for receiving the light of the turning grating.
Further, the material of the optical waveguide sheet is glass, and the refractive index of the glass is not less than 1.5.
Further, the refractive index of the optical waveguide sheet is 1.5 or more and 2.3 or less.
Furthermore, the coupling-in grating is one of a blazed grating, an inclined grating and a rectangular grating; or the turning grating is one of a blazed grating, an inclined grating and a rectangular grating; or the coupled-out grating is one of a blazed grating, an inclined grating and a rectangular grating.
According to another aspect of the present invention, there is provided an in-vehicle head-up display including: a light source assembly; in the optical waveguide structure, the light source assembly emits light to the optical waveguide structure, and the optical waveguide structure transmits the light through the coupling-in expanding pupil and then couples the light out to human eyes.
By applying the technical scheme of the invention, the optical waveguide structure comprises an optical waveguide sheet, an incoupling grating, an outcoupling grating and a reflecting structure, wherein the incoupling grating is arranged on one side surface of the optical waveguide sheet and couples light emitted by an external light source component into the optical waveguide sheet; the coupling-out grating is arranged on the other side surface of the optical waveguide sheet, and is used for receiving light coupled into the grating and coupling the light out of the optical waveguide sheet; the reflecting structure is arranged on the coupling-out grating and used for reflecting light which is coupled out of the coupling-out grating and does not enter human eyes back to the optical waveguide sheet.
The coupling grating is arranged on one side surface of the optical waveguide sheet, so that most of light emitted by an external light source component can be coupled into the optical waveguide sheet by the coupling grating, and the coupling efficiency of the optical waveguide sheet is ensured. The coupling-out grating is arranged on the other side surface of the optical waveguide sheet, so that the coupling-out grating is used for receiving light coupled into the grating, most of effective light coupled into the optical waveguide sheet by the coupling-in grating can enter the coupling-out grating, the coupling-out grating couples the light out of the optical waveguide sheet, most of light coupled out by the coupling-out grating can enter human eyes for imaging, and the imaging stability of the optical waveguide sheet is ensured. Meanwhile, the coupling-in grating and the coupling-out grating are arranged on the surfaces of different sides of the optical waveguide sheet, the positions of the coupling-in grating and the coupling-out grating are planned, the use reliability and the working stability of the coupling-in grating and the coupling-out grating are improved, the transmission stability of light in the optical waveguide sheet is ensured, and the stable operation of the optical waveguide sheet is further ensured.
In addition, the light coupled out by the coupling-out grating can be emitted out of the optical waveguide sheet from two directions, most of the light can be transmitted in one direction and then emitted into human eyes for imaging, and a small part of the light can be transmitted in the other direction and then emitted out of the optical waveguide sheet without entering into the human eyes. Through set up reflection configuration on coupling out grating for reflection configuration can reflect the coupled out little part light that does not get into the people's eye of coupling out grating back to the optical waveguide piece, and then makes this little part light can be followed the transmission direction who jets into people's eye and transmit, and then jets into people's eye and carry out the formation of image. The arrangement makes the reflection structure not only not affect the normal imaging of the coupled-out grating, but also increases the imaging light entering human eyes, reduces the loss of light in the optical waveguide sheet, improves the transmission efficiency, further enhances the imaging effect of the optical waveguide sheet, improves the imaging definition and the imaging brightness, avoids the loss of pictures and ensures the imaging integrity.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates an imaging optical path diagram of a vehicle head-up display in accordance with an alternative embodiment of the present invention;
FIG. 2 is a schematic view showing the structure of an optical waveguide sheet not provided with a reflective structure;
FIG. 3 is a schematic view showing the optical path of the optical waveguide sheet of FIG. 2;
FIG. 4 is a schematic view showing the structure of an optical waveguide sheet of the present invention;
FIG. 5 is a schematic view showing the optical path of the optical waveguide sheet of FIG. 4;
FIG. 6 is a graph showing a horizontal direction simulated optical path and efficiency comparison of the optical waveguide sheet of FIG. 2 and the optical waveguide sheet of FIG. 4;
fig. 7 shows a vertical direction simulated optical path and efficiency comparison chart of the optical waveguide sheet of fig. 2 and the optical waveguide sheet of fig. 4.
Wherein the figures include the following reference numerals:
100. an optical waveguide structure; 10. an optical waveguide sheet; 20. coupling in a grating; 30. coupling out the grating; 40. a reflective structure; 50. a windshield.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
The invention provides an optical waveguide structure and a vehicle-mounted head-up display, and aims to solve the problem that an optical waveguide structure in the prior art is poor in imaging effect.
As shown in fig. 1 to 7, the optical waveguide structure 100 includes an optical waveguide sheet 10, an incoupling grating 20, an outcoupling grating 30 and a reflection structure 40, the incoupling grating 20 is disposed on one side surface of the optical waveguide sheet 10, and the incoupling grating 20 couples light emitted from an external light source assembly into the optical waveguide sheet 10; the coupling-out grating 30 is disposed on the other side surface of the optical waveguide sheet 10, the coupling-out grating 30 is used for receiving the light coupled into the grating 20, and the coupling-out grating 30 couples the light out of the optical waveguide sheet 10; the reflection structure 40 is disposed on the outcoupling grating 30, and the reflection structure 40 serves to reflect light, which is outcoupled from the outcoupling grating 30 and does not enter the human eye, back into the optical waveguide sheet 10.
By disposing the incoupling grating 20 on one side surface of the optical waveguide sheet 10, the incoupling grating 20 enables a large portion of light emitted from an external light source assembly to be incoupled into the optical waveguide sheet 10, so as to ensure the incoupling efficiency of the optical waveguide sheet 10. The coupling-out grating 30 is disposed on the other side surface of the optical waveguide sheet 10, such that the coupling-out grating 30 is used for receiving the light coupled into the optical waveguide sheet 20, such that most of the effective light coupled into the optical waveguide sheet 10 by the coupling-in grating 20 can be emitted into the coupling-out grating 30, and the coupling-out grating 30 couples out the optical waveguide sheet 10, such that most of the light coupled out by the coupling-out grating 30 can enter human eyes for imaging, so as to ensure the imaging stability of the optical waveguide sheet 10. Meanwhile, the incoupling grating 20 and the outcoupling grating 30 are arranged on the surfaces of different sides of the optical waveguide sheet 10, and the positions of the incoupling grating 20 and the outcoupling grating 30 are planned, so that the use reliability and the working stability of the incoupling grating 20 and the outcoupling grating 30 are improved, the transmission stability of light in the optical waveguide sheet 10 is ensured, and the stable operation of the optical waveguide sheet 10 is further ensured.
In addition, the light coupled out by the coupling-out grating 30 exits the optical waveguide sheet 10 from two directions, most of the light is transmitted in one direction and then enters the human eye for imaging, and a small part of the light is transmitted in the other direction and then exits the optical waveguide sheet 10 and does not enter the human eye. By arranging the reflection structure 40 on the coupling-out grating 30, the reflection structure 40 can reflect a small part of light coupled out by the coupling-out grating 30 and not entering human eyes back to the optical waveguide sheet 10, so that the small part of light can be transmitted along the transmission direction of entering human eyes and then enters human eyes for imaging. The arrangement makes the reflection structure 40 not only not affect the normal imaging of the coupling grating 30, but also increase the imaging light emitted into human eyes, reduce the loss of light in the optical waveguide sheet 10, improve the transmission efficiency, further enhance the imaging effect of the optical waveguide sheet 10, improve the imaging definition and the imaging brightness, avoid the loss of pictures and ensure the imaging integrity.
As shown in fig. 2, the two directions refer to the directions of the arrows at the coupling-out grating 30 in the figure, and the upward arrow refers to one direction, i.e., the direction of the incident light to the human eye. The downward arrow indicates the other direction, i.e. the direction not entering the human eye. In addition, the arrows in the optical waveguide sheet 10 indicate the direction of light propagation in the optical waveguide sheet 10.
As shown in fig. 3, a schematic diagram of the optical path direction of the optical waveguide sheet 10 without the reflective structure 40 is shown. As can be seen, the outcoupled light is outcoupled by the optical waveguide sheet 10 in two opposite directions.
As shown in fig. 4, after the reflection structure 40 is disposed at the coupling-out grating 30, the reflection structure 40 reflects the light emitted from the coupling-out grating 30 downwards into the optical waveguide sheet 10, and further emits the light to the human eye together with the imaging light incident upwards to the human eye for imaging, thereby increasing the display effect.
Fig. 5 is a schematic view showing the optical path of the optical waveguide sheet 10 of the present application. As can be seen from the figure, most of the coupled light of the optical waveguide sheet 10 is emitted into human eyes for imaging, which greatly increases the imaging effect and ensures the imaging quality.
Specifically, the projection of the incoupling grating 20 on the optical waveguide sheet 10 does not coincide with the projection of the outcoupling grating 30 on the optical waveguide sheet 10. And the projection of the incoupling grating 20 on the optical waveguide sheet 10 is staggered from the projection of the outcoupling grating 30 on the optical waveguide sheet 10. The arrangement enables the coupling grating 20 and the coupling grating 30 to be separately arranged, so that the coupling grating and the coupling grating can work independently, the interference of the two functions is avoided, the stable operation of the coupling grating 20 and the coupling grating 30 is ensured, meanwhile, the use reliability of the coupling grating and the coupling grating is improved through reasonable planning of the arrangement positions of the coupling grating 20 and the coupling grating 30, and meanwhile, the arrangement position is provided for the turning grating.
Specifically, the optical waveguide structure 100 further includes a turning grating, the turning grating is disposed on the optical waveguide sheet 10 and located on the same side surface of the optical waveguide sheet 10 as the coupling grating 20, the turning grating is configured to receive the light coupled into the coupling grating 20, and the turning grating and the coupling grating 20 are disposed on the same side surface of the optical waveguide sheet 10 at an interval, so that most of the light coupled into the coupling grating 20 is incident into the turning grating for amplifying the light by the turning grating, thereby ensuring the amplification effect of the turning grating on the light. The outcoupling grating 30 is used to receive light turning the grating. As light propagates within the optical waveguide sheet 10, the optical waveguide sheet 10 expands the received light at least in one dimension so that the light propagates at least toward one direction. The incoupling grating 20 is designed to couple light emitted from an external light source assembly into the optical waveguide sheet 10, and the turning grating is designed to receive and amplify the light coupled into the grating 20, and then the amplified light is coupled out of the optical waveguide sheet 10 by the outcoupling grating 30 and output to the human eye for imaging.
It should be noted that the turning grating can also be disposed on the surface of the coupling grating 30, and the turning grating and the coupling grating 30 can be designed separately or integrally. The setting can be carried out according to the actual situation.
It should be noted that the area of the reflecting structure 40 is equal to the area of the outcoupling grating 30. So as to ensure that the reflection structure 40 can completely cover the side surface of the coupling-out grating 30 away from the optical waveguide sheet 10, and the light transmittance at the reflection structure 40 reaches 0, so that most of the light coupled out by the coupling-out grating 30 can be emitted into human eyes for imaging, thereby reducing the loss of light in the optical waveguide sheet 10 and improving the transmission efficiency. The connecting line between the center of the coupling grating 20 and the center of the turning grating is perpendicular to the connecting line between the center of the projection of the coupling grating 30 on the optical waveguide sheet 10 and the center of the turning grating, and the coupling grating 30 couples light out of the optical waveguide sheet 10. This arrangement enables the effective light in the turning grating to be mostly incident into the outcoupling grating 30 for outcoupling of light by the outcoupling grating 30, so as to ensure the outcoupling efficiency of the optical waveguide sheet 10.
Specifically, the reflective structure 40 is a metal film. Since the metal film has the advantage of high reflectivity, the arrangement is favorable for ensuring the reflection effect of the reflection structure 40, and simultaneously, the light in the optical waveguide sheet 10 cannot be transmitted out by the reflection structure 40, thereby avoiding the loss of the imaging light.
Specifically, the material of the metal film includes one of Al, Ag, Cu, and Au. Because not all light in the optical waveguide sheet 10 can be diffracted into the human eyes through the coupling-out grating 30 for imaging, a small part of light is transmitted out of the coupling-out grating 30 after being diffracted, so that the loss of coupling-out efficiency is caused, and the metal film is arranged at the coupling-out grating 30, so that the light can reach 0 transmittance at the metal film, the large part of light in the optical waveguide sheet 10 is coupled out to the human eyes through the coupling-out grating 30, the loss of the light in the optical waveguide sheet 10 in the transmission process is greatly reduced, and the display effect is effectively improved. Preferably, Al or Ag is used, which is advantageous in ensuring high reflectance characteristics of the metal film since Al and Ag are metal materials having high reflectance.
Of course, the material of the metal film is not limited to the above, and other metal films having high reflectance may be used.
In the present application, the metal film has a reflectance of more than 98% in a wavelength range of 500nm to 800 nm.
The metal film is plated on the outcoupling grating 30.
Specifically, the thickness of the reflective structure 40 is 1 micron or more and 100 microns or less. If the thickness of the reflective structure 40 is smaller than 1 μm, the thickness of the reflective structure 40 is too thin, so that the reflective structure 40 is not easy to manufacture, and the manufacturing difficulty of the reflective structure 40 is increased. If the thickness of the reflective structure 40 is greater than 100 μm, the thickness of the reflective structure 40 is too thick, which is not favorable for the light and thin of the reflective structure 40, and is also unfavorable for the molding of the reflective structure 40 and the coupling-out grating 30, so that the reflective structure 40 is too thick and heavy, which is liable to cause the risk of the separation of the reflective structure 40 from the coupling-out grating 30, and is unfavorable for the stable connection between the reflective structure 40 and the coupling-out grating 30. The thickness of the reflection structure 40 is limited within the range of 1 micron to 100 microns, so that the light and thin of the reflection structure 40 can be guaranteed, the reflection effect of the reflection structure 40 can be guaranteed, and the use reliability of the reflection structure 40 can be guaranteed.
Specifically, the material of the optical waveguide sheet 10 is glass, and the refractive index of the glass is not less than 1.5. This arrangement is advantageous in ensuring that the material of the optical waveguide sheet 10 is glass having a high refractive index, and is advantageous in the transmission of light inside the optical waveguide sheet 10. The glass is a high refractive index glass, which effectively increases the angle of view of the optical waveguide sheet 10 and improves the imaging quality of the optical waveguide sheet 10. Similarly, the optical waveguide sheet 10 of different materials may be selected according to actual requirements.
Specifically, the refractive index of the glass is 1.5 or more and 2.3 or less. This arrangement is advantageous for ensuring the high refractive index characteristic of glass to realize the optical waveguide sheet 10 with an ultra-large angle of view.
Specifically, the thickness of the optical waveguide sheet 10 is 1 mm or more and 20 mm or less. If the thickness of the optical waveguide sheet 10 is less than 1 mm, the optical waveguide sheet 10 is not easy to manufacture, the processing difficulty of the optical waveguide sheet 10 is increased, and the optical waveguide sheet 10 is easy to break during use, thereby reducing the structural strength of the optical waveguide sheet 10. If the thickness of the optical waveguide sheet 10 is larger than 20 mm, the thickness of the optical waveguide sheet 10 becomes too large, which is disadvantageous for miniaturization of the optical waveguide sheet 10. The thickness of the optical waveguide sheet 10 is limited to the range of 1 mm to 20 mm, and the structural strength of the optical waveguide sheet 10 is ensured while the miniaturization of the optical waveguide sheet 10 is ensured.
In particular, the incoupling grating 20 is a diffraction grating. The period of the diffraction grating is equal to or more than 300 nanometers and equal to or less than 600 nanometers. The arrangement ensures that the light emitted by the external light source component can be totally reflected in the diffraction grating, so that most of the light emitted by the external light source component can be coupled into the optical waveguide sheet 10, and the coupling efficiency of the coupling grating 20 is ensured.
Specifically, the incoupling grating 20 is one of a blazed grating, an inclined grating, and a rectangular grating; or the turning grating is one of a blazed grating, an inclined grating and a rectangular grating; or the outcoupling grating 30 is one of a blazed grating, an inclined grating, and a rectangular grating. In this way, different gratings can be used according to different application requirements, the in-coupling grating 20 can introduce the input light field information, then the in-coupling grating is used for carrying out pupil expanding transmission to the out-coupling grating 30 through the turning grating, and finally the in-coupling grating is led out to human eyes, parameters in the gratings can be adjusted, and finally the uniformity and the diffraction efficiency of the out-coupling light field are adjusted to meet the practical application.
The blazed grating is a grating having a blazed characteristic, in which the groove surface is not parallel to the normal of the grating, that is, a small included angle exists between the groove surface and the normal of the grating. The sawtooth type grating is an ideal blazed grating, and the cross section of the sawtooth type grating is in a sawtooth structure for diffraction. The tilted grating is a grating in which the plane of the grating and the tangential direction of the grating form a certain inclination angle. The rectangular grating is a grating which diffracts light with a rectangular cross section.
In addition, the periods of the coupling grating 20, the turning grating and the coupling grating 30 are all more than or equal to 300 nanometers and less than or equal to 600 nanometers; the heights of the incoupling grating 20, the turning grating and the outcoupling grating 30 are all greater than or equal to 200 nanometers and less than or equal to 500 nanometers. Of course, the specific specifications can be adjusted according to design requirements.
As shown in fig. 6, a horizontal simulated optical path and an efficiency contrast chart of the optical waveguide sheet 10 without the reflection structure 40 in fig. 2 and the optical waveguide sheet 10 of the present application are shown, and the horizontal axis indicates the incident angle range in the horizontal direction and the unit is degree. The vertical axis indicates display efficiency. In the figure, the upper curve is a curve of the optical waveguide sheet 10 of the present application, and the lower curve is a curve of the optical waveguide sheet 10 in fig. 2 without the reflection structure 40.
FIG. 7 is a graph showing the comparison of the optical path and efficiency in the vertical direction between the optical waveguide sheet 10 without the reflection structure 40 in FIG. 2 and the optical waveguide sheet 10 of the present application; the horizontal axis represents the range of incident angles in the vertical direction, in degrees. The vertical axis indicates display efficiency. In the figure, the upper curve is a curve of the optical waveguide sheet 10 of the present application, and the lower curve is a curve of the optical waveguide sheet 10 in fig. 2 without the reflection structure 40. As shown in fig. 6 and 7, the display efficiency of the optical waveguide sheet 10 of the present application is improved by more than two times compared to the optical waveguide sheet 10 without the reflection structure 40.
As shown in fig. 1, the vehicle-mounted head-up display includes a light source assembly and the above-mentioned light guide structure 100, the light source assembly emits light to the light guide structure 100, and the light guide structure 100 transmits the light through the coupling-in expanding pupil and then couples out to the windshield 50 of the vehicle, so as to enter into human eyes for imaging through reflection of the windshield 50. Because the vehicle-mounted head-up display is arranged in the automobile, the imaging light of the vehicle-mounted head-up display is reflected to human eyes through the windshield 50 of the automobile, and the information in the real world can be observed when the windshield 50 is transparent. The imaging light is reflected to the windshield 50 through the vehicle-mounted head-up display, so that the imaging surface of the vehicle-mounted head-up display is superposed with information in the real world, a user can observe the information on the instrument panel without lowering the head, and the convenience is improved. Meanwhile, the vehicle-mounted head-up display has the advantages of high transmission efficiency and good imaging effect, so that a user can observe information displayed by the vehicle-mounted head-up display more clearly, and the use satisfaction of the user is greatly improved.
It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optical waveguide structure, comprising:
an optical waveguide sheet (10);
the optical waveguide sheet comprises an incoupling grating (20), wherein the incoupling grating (20) is arranged on one side surface of the optical waveguide sheet (10), and the incoupling grating (20) is used for coupling light emitted by an external light source component into the optical waveguide sheet (10);
a coupling-out grating (30), the coupling-out grating (30) being disposed on the other side surface of the optical waveguide sheet (10), the coupling-out grating (30) being configured to receive light of the coupling-in grating (20), the coupling-out grating (30) coupling the light out of the optical waveguide sheet (10);
a reflection structure (40), wherein the reflection structure (40) is arranged on the coupling-out grating (30), and the reflection structure (40) is used for reflecting the light which is coupled out by the coupling-out grating (30) and does not enter the human eye back to the optical waveguide sheet (10).
2. Optical waveguide structure according to claim 1, characterized in that the projection of the incoupling grating (20) on the optical waveguide sheet (10) does not coincide with the projection of the outcoupling grating (30) on the optical waveguide sheet (10).
3. Optical waveguide structure according to claim 1, characterized in that the reflecting structure (40) is a metal film.
4. The optical waveguide structure of claim 3, wherein the material of the metal film comprises one of Al, Ag, Cu, and Au.
5. Optical waveguide structure according to claim 1, characterized in that the thickness of the reflecting structure (40) is equal to or greater than 1 micron and equal to or less than 100 microns.
6. The optical waveguide structure according to any one of claims 1 to 5, further comprising a turning grating disposed on the optical waveguide sheet (10) and located on the same side surface of the optical waveguide sheet (10) as the incoupling grating (20), the turning grating being configured to receive light of the incoupling grating (20), and the outcoupling grating (30) being configured to receive light of the turning grating.
7. The optical waveguide structure according to claim 6, wherein the material of the optical waveguide sheet (10) is glass, and the refractive index of the glass is not less than 1.5.
8. The optical waveguide structure according to claim 6, wherein the refractive index of the optical waveguide sheet (10) is 1.5 or more and 2.3 or less.
9. The optical waveguide structure of claim 6,
the incoupling grating (20) is one of a blazed grating, an inclined grating and a rectangular grating; or
The turning grating is one of a blazed grating, an inclined grating and a rectangular grating; or
The outcoupling grating (30) is one of a blazed grating, an inclined grating and a rectangular grating.
10. An on-vehicle heads-up display, comprising:
a light source assembly;
the optical waveguide structure (100) of any one of claims 1 to 9, the light source assembly emitting light into the optical waveguide structure (100), the optical waveguide structure (100) re-coupling the light into a human eye through a coupling-in pupil transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110506050.7A CN113075768A (en) | 2021-05-10 | 2021-05-10 | Optical waveguide structure and vehicle-mounted head-up display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110506050.7A CN113075768A (en) | 2021-05-10 | 2021-05-10 | Optical waveguide structure and vehicle-mounted head-up display |
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| CN113075768A true CN113075768A (en) | 2021-07-06 |
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| CN202110506050.7A Pending CN113075768A (en) | 2021-05-10 | 2021-05-10 | Optical waveguide structure and vehicle-mounted head-up display |
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| CN105765421A (en) * | 2013-10-29 | 2016-07-13 | 瑞士Csem电子显微技术研发中心 | Optical grating coupling structure |
| CN107092093A (en) * | 2017-06-16 | 2017-08-25 | 北京灵犀微光科技有限公司 | Waveguide display device |
| CN110727049A (en) * | 2018-07-16 | 2020-01-24 | 深圳市光鉴科技有限公司 | Light projection method and device |
| CN110764260A (en) * | 2018-07-28 | 2020-02-07 | 华为技术有限公司 | Augmented reality device |
| CN112130246A (en) * | 2020-10-13 | 2020-12-25 | Oppo广东移动通信有限公司 | Diffraction grating structure, imaging device and wearable device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105765421A (en) * | 2013-10-29 | 2016-07-13 | 瑞士Csem电子显微技术研发中心 | Optical grating coupling structure |
| CN107092093A (en) * | 2017-06-16 | 2017-08-25 | 北京灵犀微光科技有限公司 | Waveguide display device |
| CN110727049A (en) * | 2018-07-16 | 2020-01-24 | 深圳市光鉴科技有限公司 | Light projection method and device |
| CN110764260A (en) * | 2018-07-28 | 2020-02-07 | 华为技术有限公司 | Augmented reality device |
| CN112130246A (en) * | 2020-10-13 | 2020-12-25 | Oppo广东移动通信有限公司 | Diffraction grating structure, imaging device and wearable device |
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Application publication date: 20210706 |