CN116047649B - Geometric optical waveguide coupling device and near-to-eye display equipment - Google Patents
Geometric optical waveguide coupling device and near-to-eye display equipment Download PDFInfo
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- CN116047649B CN116047649B CN202310047978.2A CN202310047978A CN116047649B CN 116047649 B CN116047649 B CN 116047649B CN 202310047978 A CN202310047978 A CN 202310047978A CN 116047649 B CN116047649 B CN 116047649B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 100
- 238000010168 coupling process Methods 0.000 title claims abstract description 58
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 58
- 230000008878 coupling Effects 0.000 title claims abstract description 57
- 239000000758 substrate Substances 0.000 claims abstract description 90
- 230000010287 polarization Effects 0.000 claims abstract description 52
- 239000011159 matrix material Substances 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims description 24
- 230000003190 augmentative effect Effects 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 3
- 210000001747 pupil Anatomy 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000004424 eye movement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—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
- G02B27/0172—Head mounted characterised by optical features
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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
- G02B6/0055—Reflecting element, sheet or layer
Abstract
The application provides a geometric optical waveguide coupling device and near-to-eye display equipment, wherein the device comprises an optical waveguide coupling unit, an optical waveguide unit and an optical waveguide coupling-out unit; the light wave coupling unit comprises a light wave coupling surface and a polarization surface parallel to the light wave coupling surface; the optical waveguide unit comprises a 1/4 phase delay plate and a reflecting surface; the light wave coupling-out unit comprises a substrate and a light wave coupling-out surface arranged on the substrate; the collimated light wave coupled in by the light wave coupling-in unit enters the matrix of the light wave coupling-out unit after passing through the polarization surface and the light wave coupling-in surface, the light wave after being subjected to phase modulation of the 1/4 phase retarder is reflected by the reflecting surface again to pass through the 1/4 phase retarder, and then the light wave enters the matrix again after being reflected by the polarization surface to be transmitted in a total reflection mode, so that the light wave coupling-out surface outputs the target light wave. The technical problems that the structure of the geometrical optical waveguide solution of the related technology is complex, the processing technology is complex, and the design of the near-to-eye display equipment is not facilitated due to the limitation of an included angle can be at least solved.
Description
Technical Field
The application relates to the technical field of optics, in particular to a geometric optical waveguide coupling device and near-to-eye display equipment.
Background
The market for augmented reality (english full name Augmented Reality, abbreviated "AR") portable and wearable devices is rapidly growing. In various hardware implementations, near-to-eye Display (NED) with transparent glasses may provide an effective and immersive AR experience. The near-eye display, also called head-mounted display or wearable display, can create a virtual image in a monocular or binocular field of view, which renders light field information to the human eye through a display device placed within a non-apparent viewing distance of the human eye, thereby reconstructing a virtual scene in front of the eye. The augmented reality is a technology for skillfully fusing virtual information with the real world.
In practical applications, a solution based on geometric optical waveguides may be used to achieve near-eye display. In the head-wearing display or the wearable display device formed on the basis of the geometric optical waveguide, the appearance design structure is similar to that of common glasses, is more fit with the ergonomic design, is light and comfortable, and can better face the C-end market. Specifically, the solution of geometric optical waveguide in the related art includes three parts of coupling in, waveguide out, and the general workflow is: the coupling-in part couples the image source into the waveguide for total reflection transmission, and the coupling-out part couples part of light out to realize one-dimensional pupil expansion, so that a human eye can observe a complete image in an eye movement range (EYEBOX), wherein the waveguide part is used for realizing light nondestructive transmission. Under the condition that relevant parameters such as an optical machine, a waveguide, materials and the like meet relevant requirements, the optical waveguide can realize a large field angle on the light and thin optical lens.
However, the inventors have found at least that: the geometric optical waveguide solution in the related art has complex structure and complex processing technology, and the included angle between the optical axis of the optical machine and the plane of the waveguide needs to be limited in a certain range, which is not beneficial to the appearance design of the near-to-eye display equipment.
Disclosure of Invention
An object of the present application is to provide a geometric optical waveguide coupling device and a near-to-eye display device, which are at least used for solving the technical problems that the geometric optical waveguide solution in the related art is complex in structure, the processing technology is complicated, and the included angle between the optical axis of the optical machine and the plane of the waveguide needs to be limited in a certain range, which is not beneficial to the appearance design of the near-to-eye display device.
To achieve the above object, some embodiments of the present application provide a geometrical optical waveguide coupling device comprising an optical waveguide coupling-in unit, an optical waveguide unit and an optical waveguide coupling-out unit; the light wave coupling-in unit comprises a light wave coupling-in surface and a polarization surface parallel to the light wave coupling-in surface; the optical waveguide unit comprises a 1/4 phase delay plate and a reflecting surface; the light wave coupling-out unit comprises a substrate and a light wave coupling-out surface arranged on the substrate; the collimated light wave coupled in by the light wave coupling-in unit enters the matrix of the light wave coupling-out unit after passing through the polarization surface and the light wave coupling-in surface, the light wave after being subjected to phase modulation of the 1/4 phase retarder passes through the 1/4 phase retarder again after being reflected by the reflection surface, and then the light wave enters the matrix again after being reflected by the polarization surface so as to be transmitted in a total reflection mode, so that the light wave coupling-out surface outputs a target light wave.
Some embodiments of the present application also provide a near-eye display device comprising an optical display means and a geometric optical waveguide coupling means as described above; the optical display device is used for emitting display light waves for displaying the target image.
Compared with the prior art, in the scheme provided by the embodiment of the application, the structural design of the coupling surface of the conventional geometric waveguide is optimized, the geometric waveguide structure and the processing technology are simplified, the included angle between the optical axis of the optical machine in the geometric waveguide module and the plane of the waveguide is not limited, and the appearance design of the follow-up near-to-eye display equipment is facilitated.
Drawings
FIG. 1 is a schematic diagram of an exemplary structure of a geometric optical waveguide coupling device according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an exemplary structure of another geometric optical waveguide coupling device according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of an exemplary structure of another geometric optical waveguide coupling device according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of an exemplary structure of another geometric optical waveguide coupling device according to an embodiment of the present disclosure;
fig. 5 is an exemplary structural schematic diagram of an optical wave transmission path of a geometric optical waveguide coupling device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an exemplary geometrical optical waveguide coupling device in the related art.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The following terms are used herein.
And an optical waveguide which can realize one-dimensional pupil expansion and can realize nondestructive transmission by total reflection.
Both the reflection and transmission characteristics depend on polarization when light rays penetrate the surface of the optical element at non-perpendicular angles, S-polarized light and P-polarized light. In this case the coordinate system used is defined by the plane containing the input and reflected beams. If the polarization vector of the light is in this plane, it is called p-polarization, and if the polarization vector is perpendicular to this plane, it is called s-polarization. Either input polarization state can be represented as a vector sum of s and p components.
The angle of view, also known as the field of view in optical engineering, determines the field of view of the optical instrument.
Example 1
The embodiment of the application provides a geometric optical waveguide coupling device, which is shown in combination with fig. 1 to 4, and comprises an optical waveguide coupling-in unit, an optical waveguide unit and an optical waveguide coupling-out unit;
the light wave coupling-in unit comprises a light wave coupling-in surface 11 and a polarization surface 12 parallel to the light wave coupling-in surface 11;
the optical waveguide unit includes a 1/4 phase retarder 21 and a reflecting surface 22;
the light-wave coupling-out unit comprises a substrate 31 and a light-wave coupling-out surface 32 arranged on the substrate 31;
the collimated light wave coupled in by the light wave coupling unit enters the substrate 31 of the light wave coupling unit after passing through the polarization surface 12 and the light wave coupling surface 11, the light wave after phase modulation of the 1/4 phase retarder passes through the 1/4 phase retarder again after being reflected by the reflection surface, thus, the light wave passes through the 1/4 phase retarder 21 twice, and then the light wave enters the substrate 31 again after being reflected by the polarization surface 12 for total reflection transmission, so that the light wave coupling surface 32 outputs a target light wave, and the target light wave can enter human eyes.
In some embodiments of the present application, the number of light-coupling surfaces 32 may be plural. The light-wave coupling-in surface 11 is configured to change a transmission angle of the coupled light wave after the collimated light wave is coupled into the substrate 31, so that the transmission angle of the light wave entering the substrate 31 can meet a total reflection condition, perform total reflection transmission in the substrate 31, and then perform pupil expansion through the light-wave coupling-out surface 32 to output a target light wave. Wherein the outer surface of the light wave coupling-out surface 32 is coated with a corresponding reflective film.
Further, in some embodiments of the present application, the base 31 may include a first substrate 311 and a second substrate 312, where the first substrate 311 and the second substrate 312 are parallel, and the light-wave coupling-out surface 32 is obliquely disposed between the first substrate 311 and the second substrate 312; one end of the light-wave coupling-out surface 32 is connected to the first substrate 311, and the other end of the light-wave coupling-out surface 32 is connected to the second substrate 312. The first substrate 311 and the second substrate 312, which are disposed parallel to each other, are configured to perform total reflection transmission on the light waves coupled into the light wave coupling-in surface 11, so that the light wave coupling-out surface 32 outputs the target light waves.
In some examples, the light source of the collimated light wave may be the optical display device 41, and the optical display device 41 may specifically emit a display light wave for displaying a desired image, where the display light wave may be a light wave with no polarization state or a light wave with polarization state. The optical display device 41 may include one of an OLED display device, a micro led display device, an LCOS display device, and a DLP display device, among others.
In some embodiments of the present application, the polarization plane 12 is specifically a polarizer or a polarizing film, that is, the polarization plane 12 may be provided by a polarizer or a polarizing film, which is used to transmit light waves of one polarization state and reflect light waves of another polarization state. In practical application, if the polaroid is used, glue is needed to be used for gluing, and the polaroid film is directly attached to the polaroid by a layer of glue, so that the processing technology is simpler, and related personnel can select the polaroid according to practical conditions.
Wherein, the 1/4 phase retarder 21 is used for converting the polarization state of the light wave.
In some embodiments of the present application, the reflecting surface 22 is specifically a reflecting surface 22 of a mirror. The reflecting surface 22 is disposed at a predetermined position of the substrate 31, for changing the transmission direction of the light wave.
The optical devices are required to be closely attached to each other in the optical path direction.
Example two
The embodiment of the application is a specific implementation manner of the geometric optical waveguide coupling device provided on the basis of the first embodiment.
In some embodiments of the present application, referring specifically to fig. 1, the 1/4 phase retarder 21 is disposed in parallel between the light wave coupling-in surface 11 and the polarization surface 12;
the reflecting surface 22 is provided at a predetermined position of the base 31; specifically, the reflecting surface 22 is disposed on a first position of the second substrate 312 of the base 31, where the first position is a first position where the light wave can be reflected so that the light wave can pass through the 1/4 phase retarder 21 twice.
The optical path of the geometrical optical waveguide coupling device provided by the embodiment of the application is approximately as follows: the collimated light wave coupled in by the light wave coupling unit sequentially passes through the polarization plane 12, the 1/4 phase retarder 21 and the light wave coupling surface 11 and then enters the substrate 31 of the light wave coupling unit, and then sequentially passes through the substrate 31 and the light wave coupling surface 11 and then enters the 1/4 phase retarder 21 after being reflected by the reflection surface 22, and then the light wave is reflected by the polarization plane 12 and then enters the substrate 31 again for total reflection transmission, so that the light wave coupling surface 32 outputs the target light wave.
In the example shown in fig. 1, the human eye is located at one side of the second substrate 312, and the second substrate 312 of the base 31 outputs the target light wave.
In some examples, if the light wave output by the optical display device 41 is a light wave without polarization, the optical path is approximately as follows: after passing through the polarization plane 12, the unpolarized light wave transmits one of the collimated light waves, that is, the S polarized light wave or the P polarized light wave (hereinafter referred to as P/S), where the transmitted one of the polarized light waves P/S passes through the 1/4 phase retarder 21, is coupled into the second substrate 312 of the substrate 31 through the light coupling-in plane 11, is transmitted through the second substrate 312, is incident on the reflecting plane 22, is reflected through the reflecting plane 22, is continuously transmitted through the second substrate 312 of the substrate 31, is re-transmitted into the 1/4 phase retarder 21, where the light wave P/S in one polarization state is modulated into the other polarization state S/P after passing through the 1/4 phase retarder 21 twice, reaches the polarization plane 12, is reflected through the polarization plane 12, is transmitted through total reflection in the second substrate 312 of the substrate 31, is coupled through the light coupling-out plane 32 during the total reflection transmission of the light wave, and is output through the second substrate 312.
In some examples, if the light wave output by the optical display device 41 is a polarized light wave, the optical path is approximately as follows: the polarized light wave p/s is transmitted by the polarization plane 12, the transmitted polarized light wave p/s passes through the 1/4 phase retarder 21, then is coupled into the second substrate 312 of the matrix 31 through the light wave coupling-in plane 11, is transmitted through the second substrate 312, is incident on the reflecting plane 22, is reflected by the reflecting plane 22, continues to be transmitted through the second substrate 312 of the matrix 31, enters the 1/4 phase retarder 21 again, wherein the light wave p/s of one polarization state passes through the 1/4 phase retarder 21 twice and is modulated into the light wave of the other polarization state s/p to reach the polarization plane 12, is reflected by the polarization plane 12, enters the second substrate 312 of the matrix 31 for total reflection transmission, is coupled after encountering the light wave coupling-out plane 32 in the total reflection transmission process of the light wave, and outputs the target light wave through the second substrate 312.
Example III
The embodiment of the application is a modified structure of the geometric optical waveguide coupling device provided on the basis of the second embodiment.
In some embodiments of the present application, the direction of the light-wave coupling-out surface 32 is changed, and in particular, the arrangement manner shown in fig. 2 may be referred to, where the human eye is located on one side of the optical display device 41, and the first substrate 311 of the substrate 31 outputs the target light wave.
In addition, in practical applications, the angle of the light-wave coupling-out surface 32 may be adjusted according to practical requirements, which is not particularly limited in the embodiments of the present application.
Therefore, the geometric optical waveguide coupling device provided by the embodiment of the application can be flexibly set according to the actual needs of users.
Example IV
The embodiment of the application is a parallel embodiment with the second embodiment.
In some embodiments of the present application, referring specifically to fig. 3, the 1/4 phase retarder 21 is disposed in parallel at the bottom of the substrate 31;
the reflecting surface 22 is parallel to the bottom of the 1/4 phase retarder 21;
the optical path of the geometrical optical waveguide coupling device provided by the embodiment of the application is approximately as follows: the collimated light wave coupled in by the light wave coupling unit sequentially passes through the polarization surface 12 and the light wave coupling surface 11 and then enters the substrate 31 of the light wave coupling unit, the collimated light wave sequentially passes through the substrate 31 and then enters the 1/4 phase retarder 21 and the reflecting surface 22, the light wave is reflected by the reflecting surface 22 and then enters the 1/4 phase retarder 21 again, and then the light wave sequentially passes through the light wave coupling surface 11 and the reflection of the polarization surface 12 and then enters the substrate 31 again for total reflection transmission, so that the light wave coupling surface 32 outputs the target light wave.
In the example shown in fig. 3, the human eye is located at one side of the second substrate 312, and the second substrate 312 of the base 31 outputs the target light wave.
Specifically, the reflecting surface 22 is specifically a reflecting surface 22 of a mirror.
In some examples, if the light wave output by the optical display device 41 is a light wave without polarization, the optical path is approximately as follows: after passing through the polarization plane 12, one polarized light wave p/s of the light waves in the non-polarized state enters the second substrate 312 of the substrate 31 of the light wave coupling-out unit after passing through the light wave coupling-in plane 11, and enters the 1/4 phase retarder 21 and the reflecting plane 22 in sequence after passing through the transmission of the second substrate 312 of the substrate 31, and after passing through the reflection of the reflecting plane 22, the light waves enter the 1/4 phase retarder 21 again, wherein the light waves in one polarized state twice pass through the 1/4 phase retarder 21 and are modulated into the light waves in the other polarized state s/p to reach the polarization plane 12, and enter the second substrate 312 of the substrate 31 after passing through the reflection of the polarization plane 12 to perform total reflection transmission, and are coupled after encountering the light wave coupling-out plane 32 in the total reflection transmission process of the light waves, and output targets through the second substrate 312.
In some examples, if the light wave output by the optical display device 41 is a polarized light wave, the optical path is approximately as follows: the polarized light wave p/s is transmitted by the polarization plane 12 and enters the second substrate 312 of the substrate 31 of the light-wave coupling-out unit after passing through the light-wave coupling-in plane 11, enters the 1/4 phase retarder 21 and the reflecting plane 22 sequentially after passing through the transmission of the second substrate 312 of the substrate 31, and enters the 1/4 phase retarder 21 again after passing through the reflection of the reflecting plane 22, wherein the light wave p/s polarized light wave is modulated into the light wave s/p of the other polarized state after passing through the 1/4 phase retarder 214 twice, reaches the polarization plane 12, enters the second substrate 312 of the substrate 31 after passing through the reflection of the polarization plane 12 for total reflection transmission, and is coupled after encountering the light-wave coupling-out plane 32 in the total reflection transmission process of the light wave, and outputs the target light wave through the second substrate 312.
Example five
The embodiment of the application is a modified structure of the geometric optical waveguide coupling device, which is provided on the basis of the fourth embodiment.
In some embodiments of the present application, the direction of the light-wave coupling-out surface 32 is changed, and in particular, the arrangement manner shown in fig. 4 may be referred to, where the human eye is located on one side of the optical display device 41, and the first substrate 311 of the substrate 31 outputs the target light wave.
In addition, in practical applications, the angle of the light-wave coupling-out surface 32 may be adjusted according to practical requirements, which is not particularly limited in the embodiments of the present application.
Therefore, the geometric optical waveguide coupling device provided by the embodiment of the application can be flexibly set according to the actual needs of users.
The principles of the geometric optical waveguide coupling device provided in the first to fifth embodiments are approximately as follows:
as shown in fig. 5, assuming that the angle between the light wave coupling surface 11 and the bottom surface of the second substrate 312 is α, the angle between the incident light wave and the bottom surface of the second substrate 312 is β, the refractive index of the first substrate 311 and the second substrate 312 included in the base body 31 is n, and the FOV represents the angle of view of the optical display device 41, the following conditions are satisfied for α and β:
those skilled in the art will appreciate that the first formula described above is used to satisfy the need for angular adjustment; the second formula is used to satisfy the total reflection condition. In practical application, the value range of theta can be determined through the field angle and the refractive index which need to be met, and then the alpha and the beta can be flexibly adjusted in a linkage way, so that the requirement of a larger range of coupling angles in practical application can be met.
It will be appreciated by those skilled in the art that, in the related art, a common design scheme of geometric optical waveguide coupling can be referred to as shown in fig. 6, which generally follows the coupling angle, that is, the relationship that the included angle (2θ) between the light incident surface and the bottom surface is equal to twice the included angle (θ) between the reflective array surface and the bottom surface, so that the coupled light can exit perpendicular to the waveguide lens or has a very small included angle with the normal direction of the waveguide lens. When the included angle between the optical axis of the optical machine in the geometric optical waveguide module and the plane of the waveguide is limited, θ is usually adjusted to adapt, but because θ is limited by total reflection angle, film design, waveguide thickness, coupling area and other factors, the included angle between the optical axis of the optical machine in the geometric optical waveguide module and the plane of the waveguide is limited in a limited adjusting range, for example, if θ is too large, on one hand, the number of light wave coupling surfaces is increased, on the other hand, the situation that the film design difficulty is relatively high is existed, and the appearance design of the subsequent near-to-eye display device is not facilitated. Here, the optical machine is understood to be an optical display device.
Compared with the related art, the geometric optical waveguide coupling device provided by the embodiment of the application optimizes the structural design of the conventional geometric waveguide coupling surface, simplifies the geometric waveguide structure and the processing technology, ensures that the included angle between the optical axis of the optical machine in the geometric waveguide module and the plane of the waveguide is not limited, and is beneficial to the appearance design of the follow-up near-to-eye display equipment.
Example six
Embodiments of the present application provide a near-eye display device comprising an optical display device 41 and a geometric optical waveguide coupling device as described in any of the embodiments above;
the optical display device 41 is configured to emit a display light wave for displaying a target image.
In some embodiments of the present application, the optical display device 41 may include one of an OLED display device, a micro led display device, an LCOS display device, and a DLP display device.
In some embodiments of the present application, the near-eye display device comprises a virtual reality display device or an augmented reality display device.
The flowchart or block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of devices, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. A plurality of units or means recited in the apparatus claims can also be implemented by means of one unit or means in software or hardware. The terms first, second, etc. are used to denote a name, but not any particular order.
Claims (9)
1. A geometrical optical waveguide coupling device, characterized in that the device comprises an optical waveguide coupling unit, an optical waveguide unit and an optical waveguide coupling-out unit;
the light wave coupling-in unit comprises a light wave coupling-in surface and a polarization surface parallel to the light wave coupling-in surface;
the optical waveguide unit comprises a 1/4 phase delay plate and a reflecting surface;
the light wave coupling-out unit comprises a substrate and a light wave coupling-out surface arranged on the substrate;
the collimated light wave coupled in by the light wave coupling-in unit enters the matrix of the light wave coupling-out unit after passing through the polarization surface and the light wave coupling-in surface, the light wave after being subjected to phase modulation of the 1/4 phase retarder passes through the 1/4 phase retarder again after being reflected by the reflection surface, and then the light wave enters the matrix again after being reflected by the polarization surface so as to be transmitted in a total reflection way, so that the light wave coupling-out surface outputs a target light wave;
the substrate comprises a first substrate and a second substrate, the first substrate and the second substrate are parallel, and the light wave coupling surface is obliquely arranged between the first substrate and the second substrate; one end of the light wave coupling surface is connected with the first substrate, and the other end of the light wave coupling surface is connected with the second substrate;
the light wave coupling-in surface and the bottom surface of the second substrate form an included angle alpha, and the included angle between the incident light wave and the bottom surface of the second substrate is beta; the alpha and beta satisfy the following conditions:
wherein n represents refractive indices of the first and second substrates, and FOV represents a field angle of the optical display device.
2. The device of claim 1, wherein the 1/4 phase retarder is disposed in parallel between the light wave coupling-in face and the polarization face;
the reflecting surface is arranged at a preset position of the matrix;
the collimated light wave coupled in by the light wave coupling-in unit sequentially passes through the polarization plane, the 1/4 phase delay plate and the light wave coupling-in surface and then enters the substrate of the light wave coupling-out unit, after being reflected by the reflection surface, sequentially passes through the substrate and the light wave coupling-in surface and then enters the 1/4 phase delay plate again, and then the light wave is reflected by the polarization plane and then enters the substrate again to perform total reflection transmission, so that the light wave coupling-out surface outputs a target light wave.
3. The device of claim 1, wherein the 1/4 phase retarder is disposed in parallel at the bottom of the substrate;
the reflecting surface is arranged at the bottom of the 1/4 phase delay plate in parallel;
the collimated light waves coupled in by the light wave coupling-in unit sequentially pass through the polarization surface and the light wave coupling-in surface and then enter the substrate of the light wave coupling-out unit, the collimated light waves sequentially pass through the substrate and then enter the 1/4 phase delay plate and the reflection surface, the light waves are reflected by the reflection surface and then enter the 1/4 phase delay plate again, and then the light waves sequentially pass through the light wave coupling-in surface and the reflection of the polarization surface and then enter the substrate again for total reflection transmission, so that the light wave coupling-out surface outputs target light waves.
4. A device according to claim 3, characterized in that the reflecting surface is in particular a reflecting surface of a mirror.
5. The device according to claim 1, wherein the polarization plane is embodied as a polarizer or a polarizing film.
6. The device of claim 1, wherein the number of light coupling-out faces is a plurality.
7. A near-eye display device comprising an optical display device and a geometrical optical waveguide coupling device as claimed in any one of claims 1 to 6;
the optical display device is used for emitting display light waves for displaying the target image.
8. The apparatus of claim 7, wherein the optical display device comprises one of an OLED display device, a micro led display device, an LCOS display device, and a DLP display device.
9. The device of claim 7, wherein the near-eye display device comprises a virtual reality display device or an augmented reality display device.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272198A (en) * | 2016-04-07 | 2017-10-20 | 谷歌公司 | The bending eyepiece with color correction for head-mounted display |
| CN108107576A (en) * | 2017-11-27 | 2018-06-01 | 北京灵犀微光科技有限公司 | Waveguide display device |
| CN113900182A (en) * | 2021-10-14 | 2022-01-07 | Oppo广东移动通信有限公司 | Optical device and head-mounted display equipment |
| CN115144952A (en) * | 2022-09-06 | 2022-10-04 | 北京灵犀微光科技有限公司 | Optical waveguide device and near-to-eye display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10866426B2 (en) * | 2018-02-28 | 2020-12-15 | Apple Inc. | Scanning mirror display devices |
| JP2022538957A (en) * | 2019-06-27 | 2022-09-07 | ルーマス リミテッド | Apparatus and method for eye tracking based on imaging the eye through light guide optics |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272198A (en) * | 2016-04-07 | 2017-10-20 | 谷歌公司 | The bending eyepiece with color correction for head-mounted display |
| CN108107576A (en) * | 2017-11-27 | 2018-06-01 | 北京灵犀微光科技有限公司 | Waveguide display device |
| CN113900182A (en) * | 2021-10-14 | 2022-01-07 | Oppo广东移动通信有限公司 | Optical device and head-mounted display equipment |
| CN115144952A (en) * | 2022-09-06 | 2022-10-04 | 北京灵犀微光科技有限公司 | Optical waveguide device and near-to-eye display device |
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