Optical waveguide and AR glasses
By adopting optical waveguide structures with prism coupled into prism, transverse waveguide and prism waveguide coupled out in AR glasses, the problems of thickness and aesthetics of AR glasses in the prior art are solved, and a more comfortable and beautiful wearing experience is achieved.
Patent Information
- Application Number
- CN202510349548.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-22
- Publication Date
- 2025-06-24
AI Technical Summary
The optical waveguide design of existing AR glasses results in an increase in the thickness of the glasses, affecting the aesthetics and comfort of wearing.
An optical waveguide structure including a coupling prism, a transverse waveguide and a coupling prism waveguide is adopted. The transverse waveguide propagates the light beam laterally, and passes through the transmission into the coupling prism waveguide, and finally enters the human eye.
The compact design of the optical waveguide is realized, reducing the thickness of the glasses, and improving the aesthetics and comfort of wearing.
Smart Images
Figure CN120195798A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of AR display, and in particular to an optical waveguide and an AR glasses. Background Art
[0002] The optical module of AR is mainly divided into two parts. The first part is a micro display module, including a micro display (LCD screen, LCOS / DLP display panel, uLED / uOLED, other micro projections). The second part is the waveguide for the eyes, including a prism waveguide (in the form of a prism, the main companies are Epson and Naidejia), an array waveguide (a beam splitting device glued by multiple grating sheets, the main manufacturers are Shanghai Lipai, Longjing Optoelectronics, etc.), a diffraction waveguide (nano-scale micro stripes are transferred onto a silicon-based glass by nanoimprinting, and light propagates through diffraction), and other waveguide solutions.
[0003] Although the waveguide sheet model and AR glasses in the prior art can achieve the display of one-to-two binoculars from the middle by a single light engine, the biggest defect is that in actual use, since the light engine is in the middle, the glasses will be very thick at the bridge of the nose (the thickness of the light engine), seriously affecting the aesthetics of wearing; at the same time, since the light engine is on the side of the bridge of the nose and the weight of the light engine is at the bridge of the nose, the load on the nose will be relatively large, affecting the comfort of wearing.
[0004] In summary, there is a lack of a convenient optical waveguide and AR glasses in the prior art.
[0005] It should be noted that the information disclosed in the above background art section is only used for understanding the background of the present application, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention
[0006] The present invention provides an optical waveguide and an AR glasses, which can solve at least one of the technical problems in the background art.
[0007] To achieve the above object, the present invention adopts the following technical solutions: An optical waveguide includes an input prism, a transverse waveguide, and a first output prism waveguide and a second output prism waveguide symmetrically arranged; a light engine is connected to the input prism for providing a projection image to the input prism; the input prism is arranged at the end side of the transverse waveguide for turning the light beam into the transverse waveguide, and the light beam propagates transversely inside the transverse waveguide by total reflection and enters the first output prism waveguide and the second output prism waveguide respectively through transmission; the first output prism waveguide and the second output prism waveguide couple the light beam outwards.
[0008] Preferably, the light beam is transmitted into the first output prism waveguide and the second output prism waveguide through the bottom surface where the transverse waveguide contacts with the first output prism waveguide and the second output prism waveguide; the bottom surface includes a first part and a second part that respectively contact with the first output prism waveguide and the second output prism waveguide, and a third part, a fourth part, and a fifth part separated by the first part and the second part; the light beam is transmitted into the first output prism waveguide and the second output prism waveguide through the first part and the second part.
[0009] Preferably, the third part, the fourth part, and the fifth part are coated with a reflective film; the first part is the part close to the input prism, and the transmittance is 5% - 50%; the transmittance of the second part is 5% - 100%.
[0010] Preferably, the inclined surface angles of the input prism are as follows: define the xyz coordinate axes, the z-axis is the thickness direction of the input prism, belonging to the longitudinal direction, and xy are the coordinates in the direction of the plane perpendicular to the z-axis; the included angle between the inclined surface of the input prism and the y-axis is θ1y; the range of θ1y is 30° - 70°; the included angle between the inclined surface of the input prism and the z-axis is θ1z; the range of θ1z is 30° - 70°.
[0011] Preferably, the inclined surface angles of the first output prism waveguide and the second output prism waveguide are: the included angle between the inclined surface and the y-axis is θ3y, and the included angle between the inclined surface and the z-axis is θ3z; θ3y = θ1y θ3z = θ1z.
[0012] Preferably, the input prism and the transverse waveguide are integrally formed or glued together.
[0013] Preferably, it is arranged at the end side of the transverse waveguide, flush with the transverse waveguide or below the transverse waveguide.
[0014] The present invention also provides an optical waveguide, including an input prism, a transverse waveguide, and a third output prism waveguide; an optical engine is connected to the input prism for providing a projection image to the input prism; the input prism is arranged at the end side of the transverse waveguide for turning the light beam into the transverse waveguide, and the light beam propagates transversely through total internal reflection inside the transverse waveguide and is respectively transmitted into the third output prism waveguide through transmission; the third output prism waveguide couples the light beam outwards.
[0015] Preferably, the light beam is transmitted into the third output prism waveguide through the bottom surface where the transverse waveguide contacts with the third output prism waveguide; the bottom surface is coated with a transmissive film, and the transmittance is 5% - 100%.
[0016] The present invention further provides an AR glasses, including the optical waveguide described in any one of the above.
[0017] The present invention has the following beneficial effects: The present invention provides a simple optical waveguide structure. By means of the transverse waveguide, the light beam propagates transversely and is transmitted into the first output prism waveguide and the second output prism waveguide and finally enters the human eye, solving the problems of the thickness and aesthetics of the AR glasses in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of an optical waveguide according to an embodiment of the present invention.
[0019] Figure 2 It is a schematic diagram of the transverse waveguide according to an embodiment of the present invention.
[0020] Figure 3 It is a schematic diagram of the coupling prism according to an embodiment of the present invention.
[0021] Figure 4 It is a schematic diagram of the first output prism waveguide and the second output prism waveguide according to an embodiment of the present invention.
[0022] Figure 5 It is a schematic diagram of another optical waveguide according to an embodiment of the present invention.
[0023] Figure 6 It is a schematic diagram of yet another optical waveguide according to an embodiment of the present invention.
[0024] Figure 7 It is a schematic diagram of another transverse waveguide according to an embodiment of the present invention.
[0025] Figure 8 It is a schematic diagram of yet another optical waveguide according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0026] The following makes a detailed description of the embodiments of the present invention. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its applications. Without conflict, the embodiments and features in the present application can be combined with each other.
[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the connection can be for fixing or for coupling or communicating.
[0028] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.
[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.
[0030] Referring to Figure 1 , an embodiment of the present invention provides an optical waveguide 1, including an input prism 11, a transverse waveguide 12, and a first output prism waveguide 131 and a second output prism waveguide 132 symmetrically arranged; An optical engine 2 is connected to the input prism 11 and is used to provide a projection image to the input prism 11; The input prism 11 is arranged at the end side of the transverse waveguide 12 and is used to turn the light beam into the transverse waveguide 12. The light beam propagates transversely inside the transverse waveguide 12 through total internal reflection and enters the first output prism waveguide 131 and the second output prism waveguide 132 respectively through transmission; the first output prism waveguide 131 and the second output prism waveguide 132 couple the light beam outwards.
[0031] The present invention provides a simple optical waveguide structure. By making the light beam propagate transversely through the transverse waveguide and then transmit into the first output prism waveguide, the second output prism waveguide and finally enter the human eye, the problems of the thickness and aesthetics of existing AR glasses are solved.
[0032] As described below, taking the input prism 11 being arranged at the right end side of the transverse waveguide 12 as an example for illustration, it can be understood that the input prism 11 can also be arranged at the left end side of the transverse waveguide 12.
[0033] As Figure 2As shown, the transverse waveguide 12 of the present invention is a cuboid structure, including a front surface S25, a rear surface S26, a left surface S23, a right surface S21, an upper surface S22, and a bottom surface. In a specific embodiment, the light beam enters the first output prism waveguide 131 and the second output prism waveguide 132 through the bottom surface where the transverse waveguide 12 contacts the first output prism waveguide 131 and the second output prism waveguide 132; The bottom surface includes a first part S241 and a second part S242 that are in contact with the first output prism waveguide 131 and the second output prism waveguide 132 respectively, and a third part S243, a fourth part S244, and a fifth part S245 that are separated by the first part S241 and the second part S242; The light beam enters the first output prism waveguide 131 and the second output prism waveguide 132 through the first part S241 and the second part S242.
[0034] In a more specific embodiment, the third part S243, the fourth part S244, and the fifth part S245 are coated with a reflective film; the first part S241 is the part close to the input prism, and the transmittance is 5% - 50%; the transmittance of the second part S242 is 5% - 100%.
[0035] As Figure 3 shown, the inclined surface angles of the input prism 11 are as follows: Define the xyz coordinate axes, the z-axis is the thickness direction of the input prism, which belongs to the longitudinal direction, and xy is the coordinate in the direction of the plane perpendicular to the z-axis; The included angle between the inclined surface of the input prism 11 and the y-axis is θ1y; the range of θ1y is 30° - 70°; The included angle between the inclined surface of the input prism 11 and the z-axis is θ1z; the range of θ1z is 30° - 70°.
[0036] As Figure 4 shown, the inclined surface angles of the first output prism waveguide 131 and the second output prism waveguide 132 are: The included angle between the inclined surface and the y-axis is θ3y, and the included angle between the inclined surface and the z-axis is θ3z; θ3y = θ1y θ3z = θ1z, that is, the angular directions of the output prism waveguide and the input prism are always equal. Through this setting of the present invention, the light beam can be directly output outward through the output prism without using a turning waveguide.
[0037] As Figure 5As shown, the input prism 11 is disposed at the end side of the transverse waveguide 12, integrally formed with the transverse waveguide 12, and disposed below the transverse waveguide 12. By making such a modification, the position of the optical engine can be lowered to be flush with the eye position instead of above the eye. Different from this, Figure 1 the input prism 11 shown in Figure 1 is disposed at the end side of the transverse waveguide 12 and is flush with the transverse waveguide 12.
[0038] As Figure 6 and Figure 7 shown, the input prism 4 is glued to the transverse waveguide 12, which is different from Figure 5 . By means of gluing, a simpler adaptation can be achieved. Figure 5 As shown in and
[0039] , the present invention further provides a single-eye optical waveguide, including an input prism 11, a transverse waveguide 12, and a third output prism waveguide 133;
[0039] As Figure 8 The optical engine 2 is connected to the input prism 11 for providing a projection image to the input prism 11; The input prism 11 is disposed at the end side of the transverse waveguide 12 for turning the light beam into the transverse waveguide 12. The light beam propagates transversely inside the transverse waveguide 12 by total internal reflection and enters the third output prism waveguide 133 through transmission respectively. The third output prism waveguide 133 couples the light beam outwards.
[0040] In a specific embodiment, the light beam enters the third output prism waveguide 133 through transmission from the bottom surface where the transverse waveguide 12 contacts the third output prism waveguide 133. The bottom surface is coated with a transmission film, and the transmittance is 5% - 100%.
[0041] The present invention also provides an AR glasses including the optical waveguide described in any one of the above.
[0042] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, they can also make several substitutions or modifications to these described embodiments, and these substitution or modification methods should all be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of protection of the patent application.
Claims
1. An optical waveguide, characterized in that: It includes a coupling-in prism, a lateral waveguide, and a first coupling-out prism waveguide and a second coupling-out prism waveguide which are symmetrically arranged; The optical machine is connected to the coupling-in prism and is used to provide a projection image to the coupling-in prism; The coupling-in prism is arranged at the end side of the transverse waveguide, and is used for turning the light beam into the transverse waveguide. The light beam propagates laterally inside the transverse waveguide by total reflection and enters the first coupling-out prism waveguide and the second coupling-out prism waveguide respectively by transmission; the first coupling-out prism waveguide and the second coupling-out prism waveguide couple the light beam outward.
2. The optical waveguide according to claim 1, wherein: The light beam is transmitted through the bottom surface of the lateral waveguide in contact with the first out-coupling prism waveguide and the second out-coupling prism waveguide into the first out-coupling prism waveguide and the second out-coupling prism waveguide; The bottom surface includes a first portion and a second portion respectively contacting the first out-coupling prism waveguide and the second out-coupling prism waveguide, and a third portion, a fourth portion and a fifth portion separated by the first portion and the second portion; The light beam is transmitted through the first part and the second part into the first outcoupling prism waveguide and the second outcoupling prism waveguide.
3. The optical waveguide according to claim 2, characterized in that: The coatings of the third part, the fourth part and the fifth part are reflective; the first part is the part close to the coupling prism, and the transmittance is: 5%~50%; the transmittance of the second part is: 5%~100%.
4. The optical waveguide according to claim 1, wherein: The bevel angle of the coupling-in prism is as follows: Define an xyz coordinate axis, wherein the z axis is the thickness direction of the coupling prism and belongs to the longitudinal direction, and xy is the coordinate of the direction of the plane perpendicular to the z axis; The angle between the inclined plane of the coupling prism and the y-axis is θ1y; the range of θ1y is: 30°~70°; The included angle between the inclined plane of the coupling-in prism and the z-axis is θ1z; the range of θ1z is 30° to 70°.
5. The optical waveguide according to claim 4, characterized in that: The bevel angles of the first out-coupling prism waveguide and the second out-coupling prism waveguide are: The angle between the inclined plane and the y-axis is θ3y, and the angle between the inclined plane and the z-axis is θ3z; θ3y=θ1y θ3z=θ1z.
6. The optical waveguide according to claim 1, wherein: The coupling-in prism is integrally formed or glued with the lateral waveguide.
7. The optical waveguide according to claim 6, characterized in that: The transverse waveguide is arranged at the end side thereof, flush with the transverse waveguide or below the transverse waveguide.
8. An optical waveguide, characterized in that: It includes a coupling-in prism, a lateral waveguide and a third coupling-out prism waveguide; The optical machine is connected to the coupling-in prism and is used to provide a projection image to the coupling-in prism; The coupling-in prism is arranged at the end side of the transverse waveguide, and is used to turn the light beam into the transverse waveguide. The light beam propagates laterally inside the transverse waveguide by total reflection and enters the third coupling-out prism waveguide by transmission; the third coupling-out prism waveguide couples the light beam outward.
9. The optical waveguide according to claim 8, characterized in that: The light beam is transmitted into the third out-coupling prism waveguide through the bottom surface of the lateral waveguide in contact with the third out-coupling prism waveguide; The bottom coating is a transparent film with a transmittance of 5% to 100%.
10. An AR glasses, characterized in that: The optical waveguide comprises the optical waveguide according to any one of claims 1 to 7, or the optical waveguide according to any one of claims 8 to 9.