A near-eye display device

Abstract

The utility model discloses a kind of near-eye display devices, the device includes optical machine and optical waveguide lens, the image light of optical machine exit is incident to optical waveguide lens, it is transmitted to human eye by optical waveguide lens, the included angle of the optical axis of optical machine and the normal line of optical waveguide lens satisfies following condition one: θ x ≥FOV x / 2;θ y ≥FOV y / 2;Wherein, θ x It is the rotation angle of optical machine in horizontal direction and the normal line of optical waveguide lens, θ y It is the rotation angle of optical machine in vertical direction and the normal line of optical waveguide lens, FOV x It is the field of view angle of picture in horizontal direction, FOV y It is the field of view angle of picture in vertical direction.The utility model can optimize ghost, improve the use experience of user by setting the optical axis of optical machine and the normal line of optical waveguide lens satisfy specific included angle.

Description

Technical Field

[0001] This utility model relates to the field of near-eye display device technology, and in particular to a near-eye display device. Background Technology

[0002] In augmented reality (AR) display devices, due to the waveguide principle, optical waveguides can easily produce images that are identical to the main image but have lower brightness and different positions when displaying virtual images; this is called ghosting.

[0003] The appearance of ghosting reduces the contrast and clarity of images, affecting the user experience. Existing technologies have difficulty solving the problem of poor user experience caused by ghosting when optical waveguide products display virtual images. Utility Model Content

[0004] This invention provides a near-eye display device that can optimize or eliminate ghosting and improve the user experience.

[0005] In a first aspect, this utility model provides a near-eye display device, including an optical engine and an optical waveguide lens. Image light emitted from the optical engine is incident on the optical waveguide lens and transmitted to the human eye through the optical waveguide lens. The angle between the optical axis of the optical engine and the normal of the optical waveguide lens satisfies one of the following conditions:

[0006] θ x ≥FOV x / 2;

[0007] θ y ≥FOV y / 2;

[0008] Where, θ x θ is the rotation angle of the optical engine in the horizontal direction relative to the normal of the optical waveguide mirror. y The field of view (FOV) is the rotation angle of the optical engine in the vertical direction relative to the normal of the optical waveguide mirror. x FOV is the field of view of the image in the horizontal direction. y It is the field of view of the image in the vertical direction.

[0009] Optionally, the optical waveguide lens includes a waveguide substrate, the waveguide substrate including a first surface, a second surface and a side surface located between the first surface and the second surface, the side surface being provided with a light-absorbing layer.

[0010] Optionally, the refractive index of the light-absorbing layer satisfies n2-0.2≤n1≤n2+0.2, and the absorption rate of the light-absorbing layer for the image light transmitted within the waveguide substrate is greater than 70%, where n1 represents the refractive index of the light-absorbing layer and n2 represents the refractive index of the waveguide substrate.

[0011] Optionally, the light-absorbing layer includes a light-absorbing material that covers the side of the waveguide substrate.

[0012] Optionally, it also includes an eyeglass frame structure, wherein the metal frame surrounding the optical waveguide lens in the eyeglass frame structure is reused as the light-absorbing layer, and a refractive index matching adhesive is provided between the metal frame and the optical waveguide lens.

[0013] Optionally, the optical waveguide lens further includes at least one astigmatic structure region, which is located on at least one of the first surface, second surface, or side surface of the optical waveguide lens. The astigmatic structure region includes an astigmatic structure, and the light incident on the astigmatic structure does not satisfy the total internal reflection condition.

[0014] Optionally, the astigmatic structure includes at least one of a one-dimensional periodic structure, a two-dimensional periodic structure, or a three-dimensional periodic structure.

[0015] Optionally, the astigmatic structure includes the three-dimensional periodic structure, which comprises two periodic structures in different directions on a first plane and at least two layers in the first direction. The first plane is parallel to the first surface of the optical waveguide lens, and the first direction is perpendicular to the first plane. The period D of the periodic structure satisfies 500 nm. <D<50μm。

[0016] Optionally, the astigmatic structure includes an aperiodic structure, which is formed by an irregular distribution of a projection width of 2μm to 50μm and a cross-section of conical or circular shape.

[0017] Optionally, the optical waveguide lens includes a minimum functional area, and the astigmatic structure region is located in at least a portion of the region outside the minimum functional area;

[0018] The image light emitted from the optical engine is coupled into the optical waveguide lens, and after total internal reflection within the optical waveguide lens, it propagates into the visible range of the human eye and is then diffracted out to enter the human eye for image display. The minimum functional area includes the region of the optical waveguide lens in which the image light is transmitted.

[0019] Optionally, the optical waveguide lens is a diffractive optical waveguide lens or an arrayed optical waveguide lens.

[0020] The near-eye display device provided in this embodiment includes an optical engine and an optical waveguide lens. Image light emitted from the optical engine is incident on the optical waveguide lens and transmitted to the human eye through the optical waveguide lens. This invention utilizes the principle of ghosting image generation and optimizes the light path for ghosting by setting the angle between the optical axis of the optical engine and the normal of the optical waveguide lens to satisfy one of the following conditions: θ x ≥FOVx / 2, θ y ≥FOV y / 2 separates the ghost image from the main image, creating a greater distance. This allows the ghost image to be moved out of the field of view, reducing visual abnormalities and improving the user experience.

[0021] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of optical fiber transmission in an existing AR waveguide technology;

[0024] Figure 2 This is a schematic diagram of light transmission in another type of AR waveguide based on existing technology;

[0025] Figure 3 This is a schematic diagram of another type of AR waveguide optical transmission in existing technology;

[0026] Figure 4 This is a schematic diagram of another type of AR waveguide optical transmission in existing technology;

[0027] Figure 5 This is a diagram illustrating the positional relationship between the main screen and the ghost image, based on existing technology.

[0028] Figure 6 This is a schematic diagram of the structure of a near-eye display device provided in an embodiment of this utility model;

[0029] Figure 7 This is a schematic diagram of the structure of an optical waveguide lens provided in an embodiment of the present invention;

[0030] Figure 8 This is a structural schematic diagram of an eyeglass frame component provided in an embodiment of this utility model;

[0031] Figure 9 This is a schematic diagram of another optical waveguide lens provided in an embodiment of the present invention;

[0032] Figure 10 yes Figure 9A cross-sectional view of the optical waveguide lens along x1x2;

[0033] Figure 11 This is a cross-sectional view of another optical waveguide lens provided in an embodiment of the utility model;

[0034] Figure 12 This is a schematic diagram of a light-scattering structure provided in an embodiment of the present invention;

[0035] Figure 13 This is a schematic diagram of another astigmatism structure provided in an embodiment of the present invention;

[0036] Figure 14 This is a schematic diagram of another astigmatism structure provided in this embodiment of the utility model;

[0037] Figure 15 This is a projection schematic diagram of an astigmatic structure provided in an embodiment of this utility model;

[0038] Figure 16 yes Figure 15 A cross-sectional view of the astigmatic structure along y1y2;

[0039] Figure 17 This is a schematic diagram of another optical waveguide lens provided in an embodiment of the present invention. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] Figure 1This is a schematic diagram of light transmission in an existing AR waveguide technology. Figure 2 This is a schematic diagram of another AR waveguide optical transmission method in the existing technology. Figure 3 This is a schematic diagram of another type of AR waveguide optical transmission technology. Figure 4 This is a schematic diagram of another type of AR waveguide optical transmission technology. Figure 5 This is a diagram illustrating the positional relationship between the main screen and the ghost image, based on existing technology. (Referencing...) Figures 1-4 , Figures 1-4 The red lines in the middle represent the light rays that create the ghosting effect. Figure 1 and Figure 2 The image shows a diffractive waveguide, whose coupling-in and coupling-out regions both include grating structures. Figure 3 and Figure 4 The image shown is an arrayed optical waveguide, whose coupling-in and coupling-out regions include beam-splitting or reflective surfaces. The principle behind ghosting is that light from the AR waveguide image enters from the coupling-in region on the left, then undergoes total internal reflection to the right. Upon reaching the right edge of the optical waveguide mirror 100, it undergoes total internal reflection. These reflected rays, when passing through the coupling-out region again, are projected into the viewer's eye as an image, appearing to the naked eye as... Figure 5 The image shown is a darker ghost image F1 that is consistent with the main screen's F information but is shifted or symmetrically positioned. Figure 5 The diagram illustrates central symmetry; in other cases, the ghost image may also be translated and overlap with the main image. Both diffractive waveguides and arrayed waveguides produce ghosting. The principle behind this is that light undergoes total internal reflection at the edge of the waveguide lens 100. The angle between the reflected light and the normal to the waveguide lens 100 remains unchanged, but their propagation directions are opposite. Therefore, when the light exits through the diffraction grating or array region, the resulting ghost image F1 is centrally symmetrical to the main image F. When the totally reflected light reaches another edge and undergoes total internal reflection again, a secondary ghost image may be generated, which is translated from the main image F. To improve the user experience, this invention provides a near-eye display device that can eliminate or optimize ghosting, improving the user experience, as detailed below:

[0043] Figure 6 This is a schematic diagram of the structure of a near-eye display device provided in an embodiment of this utility model, for reference. Figure 6 The near-eye display device includes an optical engine 200 and an optical waveguide lens 100. Image light emitted from the optical engine 200 is incident on the optical waveguide lens 100 and transmitted to the human eye after passing through the optical waveguide lens 100. Figure 6 (Not shown), the angle between the optical axis of the optical engine 200 and the normal of the optical waveguide lens 100 satisfies one of the following conditions:

[0044] θ x ≥FOV x / 2;

[0045] θ y ≥FOV y / 2;

[0046] Where, θ x θ is the rotation angle of the optical engine 200 in the horizontal direction relative to the normal of the optical waveguide mirror 100. y The field of view (FOV) is the rotation angle of the optical engine 200 in the vertical direction relative to the normal of the waveguide mirror 100. x FOV is the field of view of the image in the horizontal direction. y It is the field of view of the image in the vertical direction.

[0047] In this embodiment of the present invention, when assembling the near-eye display device, the normals of the optical engine 200 and the optical waveguide lens 100 are set at a certain angle. Since the ghost image F1 and the main image F are centrally symmetrical, that is, the angles of each point corresponding to the main image F and the ghost image F1 are symmetrical along the normal of the optical waveguide lens 100, when the optical axis of the optical engine 200 is parallel to the normal of the optical waveguide lens 100, the image areas of the main image F and the ghost image F1 overlap but the image information is centrally symmetrical. When the optical axis of the optical engine 200 and the normal of the optical waveguide lens 100 form a certain angle, the movement direction of the main image F is opposite to the movement direction of the ghost image F1. By setting the angle between the optical axis of the optical engine 200 and the normal of the optical waveguide lens 100, the ghost image F1 can be moved out of the field of view, thereby making the ghost invisible.

[0048] This embodiment of the invention utilizes the principle of ghost image generation to optimize the light path for ghost image generation. The angle between the optical axis of the optical engine 200 and the normal of the waveguide lens 100 is set to satisfy one of the following conditions: θ x ≥FOV x / 2, θ y ≥FOV y / 2 separates the ghost image from the main image, creating a greater distance. This allows the ghost image to be moved out of the field of view, reducing visual abnormalities and improving the user experience.

[0049] In the above embodiment, the ghost image is separated from the main image by setting the angle between the optical axis of the optical engine 200 and the normal of the optical waveguide lens 100. However, due to the high brightness of the ghost image, the ghost image or part of its light may still be visible at certain angles. Based on this, the optical waveguide lens can be further configured to reduce the brightness of the ghost image. Figure 7 This is a schematic diagram of the structure of an optical waveguide lens provided in an embodiment of this utility model. Optional, see reference. Figure 6 and Figure 7The optical waveguide lens 100 includes a waveguide substrate 101, which includes a first surface S1, a second surface S2 disposed opposite to each other, and a side surface S3 located between the first surface S1 and the second surface S2. A light-absorbing layer 102 is disposed on the side surface S3. It should be understood that, due to manufacturing reasons, the light-absorbing layer 102 may not only be located on the side surface S3 of the waveguide substrate 101, but may also be located on the side surface of the entire optical waveguide lens 100 (a whole composed of the waveguide substrate and a protective layer or other functional layers). No specific limitation is made here, and it can be set according to actual needs.

[0050] This embodiment of the invention provides a light-absorbing layer 102 on the side S3 of the waveguide substrate 101, which can absorb at least a portion of the light transmitted to the edge of the optical waveguide lens 100. This can reduce or even eliminate total internal reflection of the optical waveguide lens 100, thereby reducing the brightness of ghost images, further mitigating visual abnormalities, and improving the user experience.

[0051] In a specific implementation, the refractive index of the light-absorbing layer 102 needs to be close to the refractive index of the waveguide substrate 101. Optionally, the refractive index of the light-absorbing layer 102 satisfies n2-0.2≤n1≤n2+0.2, and the absorption rate of the light-absorbing layer 102 for the image light transmitted in the waveguide substrate 101 is greater than 70%, where n1 represents the refractive index of the light-absorbing layer 102 and n2 represents the refractive index of the waveguide substrate 101.

[0052] For example, transmitting an image emitted by a single green light source to the human eye via a waveguide substrate 101 requires a light-absorbing layer 102 with an absorption rate >70% for image light in the 500nm~550nm wavelength range. Understandably, when the refractive index difference between the light-absorbing layer 102 and the waveguide substrate 101 is large, the light within the waveguide substrate 101 has a high reflectivity at the interface between the waveguide substrate 101 and the light-absorbing layer 102, resulting in poor light absorption. When the refractive index of the light-absorbing layer 102 satisfies n2-0.2≤n1≤n2+0.2, the light within the waveguide substrate 101 can enter the light-absorbing layer 102 to the maximum extent, thereby further reducing the brightness of ghosting images, mitigating visual anomalies, and improving the user experience.

[0053] Optionally, the light-absorbing layer 102 includes a light-absorbing material that covers the side surface S3 of the waveguide substrate 101.

[0054] Specifically, the light-absorbing material can be applied to the side surface S3 of the waveguide substrate 101 in the form of a coating, thereby covering the side surface S3 of the waveguide substrate 101. This allows light transmitted to the edge of the optical waveguide lens 100 to enter the light-absorbing material and be absorbed, reducing or eliminating total internal reflection of light and lowering the brightness of the ghost image.

[0055] Figure 8This is a structural schematic diagram of an eyeglass frame component provided in an embodiment of this utility model. Optional, refer to... Figure 8 The near-eye display device also includes an eyeglass frame structure 300, in which the metal frame 310 surrounding the optical waveguide lens 100 is reused as a light-absorbing layer 102, and a refractive index matching adhesive is disposed between the metal frame 310 and the optical waveguide lens 100. Figure 8 (Not shown in the image).

[0056] Understandably, the metal frame 310 can be made of a metal with high absorption rate, such as cobalt alloy. For example, when the optical engine is a single green light source, the metal frame 310 can absorb more than 80% of the image light in the 500nm~550nm band, thus being reused as the light-absorbing layer 102. By setting a refractive index matching adhesive with the same refractive index as the waveguide substrate 101, the waveguide substrate 101 is connected to the metal frame 310. The light transmitted to the edge of the optical waveguide lens 100 will be absorbed at the metal frame 310 through the refractive index matching adhesive, thereby further reducing the brightness of ghosting images, mitigating visual abnormalities, and improving the user experience.

[0057] Figure 9 This is a schematic diagram of another optical waveguide lens provided in an embodiment of the present invention. Figure 10 yes Figure 9 A cross-sectional view of the optical waveguide lens along x1x2. Figure 11 This is a cross-sectional view of another optical waveguide lens provided in the embodiment of the utility model. Optional, see reference. Figures 9-11 The optical waveguide lens 100 also includes at least one astigmatic structure region A1, which is located on at least one of the first surface S1, the second surface S2, or the side surface S3 of the optical waveguide lens 100. The astigmatic structure region A1 includes an astigmatic structure 103, and the light incident on the astigmatic structure 103 does not satisfy the total internal reflection condition.

[0058] For example, refer to Figure 10 , Figure 10 The astigmatism structure 103 is disposed on the first surface S1 of the optical waveguide lens 100. (Reference) Figure 11 , Figure 11 The astigmatism structure 103 is disposed on the side S3 of the optical waveguide lens 100. In other embodiments, the astigmatism structure 103 may be disposed on two or three of the first surface S1, the second surface S2 and the side S3, specifically located on the transmission path of the light that generates the ghost image, and is used to reduce the total internal reflection of the light returning to the coupling region to form a ghost image. The specific implementation can be designed according to the actual situation.

[0059] It is understood that by providing a diffusing structure 103 on at least one of the first surface S1, the second surface S2, or the side surface S3 of the optical waveguide lens 100, the total internal reflection condition of the light transmitted from the waveguide substrate 101 to the diffusing structure 103 can be disrupted. For example, at least a portion of the light transmitted to the diffusing structure 103 can be scattered as stray light or discharged from the waveguide substrate 101. The complete ghost image will not be visible in the viewing area, blurring or reducing the brightness of the ghost image, further reducing the brightness of the ghost image, mitigating visual abnormalities, and improving the user experience. Generally, an optical waveguide lens may include a waveguide substrate, a protective sheet, or other functional layers. Therefore, it should be understood that the diffusing structure 103 is provided on at least one of the first surface S1, the second surface S2, or the side surface S3 of the optical waveguide lens 100. It can be provided on at least one of the first surface, the second surface, or the side surface of the waveguide substrate, or on the surface of the protective sheet or other functional layers, as well as on the side surface of the entire optical waveguide lens. No specific limitation is made here; it can be designed according to actual conditions.

[0060] In specific implementation, the specific shape or structure of the astigmatism structure 103 can be designed according to actual conditions. Optionally, the astigmatism structure 103 includes at least one of a one-dimensional periodic structure, a two-dimensional periodic structure, or a three-dimensional periodic structure. For example, Figure 12 This is a schematic diagram of an astigmatism structure provided in an embodiment of the present invention. Figure 13 This is a schematic diagram of another astigmatism structure provided in an embodiment of the present invention. Figure 14 This is a schematic diagram of another astigmatism structure provided in an embodiment of the present invention, wherein, Figure 12 The astigmatic structure 103 in the image is a one-dimensional periodic structure. Figure 13 The astigmatic structure 103 in the image is a two-dimensional periodic structure. Figure 14 The astigmatic structure 103 is a three-dimensional periodic structure, and its specific shape and period size can be designed according to the wavelength of the actual optical engine.

[0061] For example, refer to Figure 12 A one-dimensional periodic structure is a structure that exhibits periodicity in a single direction. (Refer to...) Figure 13 A two-dimensional periodic structure is a structure that exhibits periodicity in two different directions, as referenced. Figure 14 A three-dimensional periodic structure exhibits periodicity in two different directions on a plane, but has at least two layers of structure in the direction perpendicular to the plane.

[0062] Optionally, the astigmatic structure 103 includes a three-dimensional periodic structure, see further reference. Figure 14, the three-dimensional periodic structure includes periodic structures in two different directions on a first plane and at least two layers of structures in a first direction, the first plane is parallel to the first surface S1 of the optical waveguide lens 100, the first direction is perpendicular to the first plane, and the period D of the periodic structure satisfies 500nm<D<50μm. The periodic astigmatic structure can be regarded as a grating, which directly diffracts part of the light beam out of the waveguide substrate, reduces the light rays forming ghost images, and lowers the brightness of the ghost image.

[0063] Figure 15 is a schematic projection view of an astigmatic structure provided by an embodiment of the present utility model, Figure 16 is Figure 15 a cross-sectional view of the astigmatic structure along y1y2, optionally, with reference to Figure 15 and Figure 16 , the astigmatic structure 103 comprises an aperiodic structure, which is formed by irregular distribution of projections with a width of 2μm to 50μm and a conical or circular cross-section morphology, that is, the astigmatic structure 103 is an aperiodic random structure, which can be regarded as a scattering structure, scattering part of the light beam out of the waveguide substrate, reducing the light rays forming ghost images, and lowering the brightness of the ghost image.

[0064] Figure 17 is a schematic structural diagram of another optical waveguide lens provided by an embodiment of the present utility model, optionally, with continued reference to Figure 17 , the optical waveguide lens 100 comprises a minimum functional area A2, and the astigmatic structure area A1 is located in at least a partial area outside the minimum functional area A2; wherein the image light emitted by the optical machine 200 is coupled into the optical waveguide lens 100, propagates in the optical waveguide lens 100 by total internal reflection to the visible range of the human eye, and then the image light is diffractively coupled out to enter the human eye to realize image display, and the minimum functional area A2 includes the area of the optical waveguide lens 100 through which the image light propagates.

[0065] It can be understood that the optical waveguide lens 100 can be divided into a functional area and a non-functional area at the periphery of the functional area according to whether each area in the optical waveguide lens 100 transmits image light, wherein the image light herein refers to effective image light, that is, the light corresponding to the main picture seen by the human eye, excluding the light rays forming ghost images. The astigmatic structure area A1 of the present utility model is located in at least a partial area outside the minimum functional area A2, which can blur the ghost image without affecting the normal display of the main picture F, further reduce the brightness of the ghost image, alleviate visual abnormalities, and improve the use experience. It should be noted that, Figure 17 the case that the coupling-in area (the circle in the lens) and the coupling-out area (the rectangle in the lens) of the optical waveguide lens 100 shown in the drawing are located on the same surface is only schematic. In other embodiments, the coupling-in area and the coupling-out area can be located on different surfaces, and the position of the astigmatic structure area can be adaptively adjusted according to actual situations.

[0066] Optionally, the optical waveguide lens 100 in the above embodiments is a diffractive optical waveguide lens or an array optical waveguide lens, which can be selected according to the actual situation in specific implementation.

[0067] In summary, this embodiment of the invention utilizes the principle of ghost image generation to optimize the light path for ghost image generation, setting the angle between the optical axis of the optical engine 200 and the normal of the optical waveguide lens 100 to satisfy one of the following conditions: θ x ≥FOV x / 2, θ y ≥FOV y / 2, separating the ghost image from the main image and creating a greater distance, allows the ghost image to be moved out of the field of view, reducing visual abnormalities and improving the user experience. Furthermore, by setting a light-absorbing layer 102 on the side S3 of the waveguide substrate 101, light transmitted to the edge of the optical waveguide lens 100 can enter the light-absorbing layer 102 to reduce total internal reflection, thereby reducing the brightness of the ghost image and further reducing visual abnormalities. By setting the refractive index of the light-absorbing layer 102 to satisfy n2-0.2≤n1≤n2+0.2, and the absorption rate of the light-absorbing layer 102 for image light transmitted within the waveguide substrate 101 being greater than 70%, light within the waveguide substrate 101 can enter the light-absorbing layer 102 to the maximum extent, thereby further reducing the brightness of the ghost image. In one embodiment, the metal frame 310 surrounding the waveguide substrate 101 in the eyeglass frame structure 300 is reused as a light-absorbing layer 102. This allows light transmitted to the edge of the optical waveguide lens 100 to be absorbed at the metal frame 310 through the refractive index matching adhesive, thereby reducing the brightness of ghosting images. An astigmatic structure 103 is provided on at least one of the first surface S1, the second surface S2, or the side surface S3 of the optical waveguide lens 100, which can blur ghosting images and further reduce their brightness. The astigmatic structure region A1 is located in at least a portion of the area outside the minimum functional area A2, and can blur ghosting images and further reduce their brightness without affecting the normal display of the main screen, thus mitigating visual abnormalities and improving the user experience.

[0068] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A near-eye display device, characterized in that, The system includes an optical engine and an optical waveguide lens. Image light emitted from the optical engine is incident on the optical waveguide lens and transmitted to the human eye through the optical waveguide lens. The angle between the optical axis of the optical engine and the normal of the optical waveguide lens satisfies one of the following conditions: i x ≥FOV x / 2; i y ≥FOV y / 2; Where, θ x θ is the rotation angle of the optical engine in the horizontal direction relative to the normal of the optical waveguide mirror. y The field of view (FOV) is the rotation angle of the optical engine in the vertical direction relative to the normal of the optical waveguide mirror. x FOV is the field of view of the image in the horizontal direction. y It is the field of view of the image in the vertical direction.

2. The near-eye display device according to claim 1, characterized in that, The optical waveguide lens includes a waveguide substrate, which includes a first surface, a second surface, and a side surface located between the first surface and the second surface, and the side surface is provided with a light-absorbing layer.

3. The near-eye display device according to claim 2, characterized in that, The refractive index of the light-absorbing layer satisfies n2-0.2≤n1≤n2+0.2, and the absorption rate of the light-absorbing layer for the image light transmitted within the waveguide substrate is greater than 70%, where n1 represents the refractive index of the light-absorbing layer and n2 represents the refractive index of the waveguide substrate.

4. The near-eye display device according to claim 2, characterized in that, The light-absorbing layer includes a light-absorbing material that covers the side surface of the waveguide substrate.

5. The near-eye display device according to claim 2, characterized in that, It also includes an eyeglass frame structure, in which the metal frame surrounding the optical waveguide lens is reused as the light-absorbing layer, and a refractive index matching adhesive is provided between the metal frame and the optical waveguide lens.

6. The near-eye display device according to claim 1 or 2, characterized in that, The optical waveguide lens further includes at least one astigmatic structure region, which is located on at least one of the first surface, second surface, or side surface of the optical waveguide lens. The astigmatic structure region includes an astigmatic structure, and the light incident on the astigmatic structure does not satisfy the total internal reflection condition.

7. The near-eye display device according to claim 6, characterized in that, The astigmatic structure includes at least one of a one-dimensional periodic structure, a two-dimensional periodic structure, or a three-dimensional periodic structure.

8. The near-eye display device according to claim 7, characterized in that, The astigmatism structure includes the three-dimensional periodic structure, which comprises two periodic structures in different directions on a first plane and at least two layers in the first direction. The first plane is parallel to the first surface of the optical waveguide lens, and the first direction is perpendicular to the first plane. The period D of the periodic structure satisfies 500 nm. <D<50μm。 9. The near-eye display device according to claim 6, characterized in that, The astigmatic structure includes an aperiodic structure, which is formed by an irregular distribution of projection widths of 2μm to 50μm and cross-sections of conical or circular shapes.

10. The near-eye display device according to claim 6, characterized in that, The optical waveguide lens includes a minimum functional area, and the astigmatic structure region is located in at least a portion of the region outside the minimum functional area; The image light emitted from the optical engine is coupled into the optical waveguide lens, and after total internal reflection within the optical waveguide lens, it propagates into the visible range of the human eye and is then diffracted out to enter the human eye for image display. The minimum functional area includes the region of the optical waveguide lens in which the image light is transmitted.

11. The near-eye display device according to claim 1, characterized in that, The optical waveguide lens is a diffractive optical waveguide lens or an arrayed optical waveguide lens.

Images