Optical device and near-to-eye display device

Abstract

The invention provides an optical device and a near-to-eye display device. The optical device comprises a light guide part, a light coupling-in device arranged at one end of the light guide part and a light coupling-out device arranged at the other opposite end of the light guide part. Wherein the light coupling-out device comprises a plurality of surfaces which are arranged in parallel, and each surface is obliquely arranged relative to the total internal reflection surface of the light guide part; the multiple surfaces are arranged at intervals in the length direction of the light guide part, and the arrangement intervals of the multiple surfaces are gradually increased in the first direction; the first direction is a direction far away from the light coupling-in device; in the first direction, the surface farthest from the light coupling-in device is a total reflection surface, and the rest surfaces are partial transmission and partial reflection sheets. According to the technical scheme, by adjusting the arrangement spacing distance of the surfaces, the situation that light rays penetrate through the adjacent surfaces in the process of emitting out of the light guide part is reduced, the light ray emitting effect is improved, then the light ray transmittance is improved, the light ray uniformity is improved, and the use effect of the optical device is improved.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to an optical device and a near-eye display device. Background Art

[0002] Existing light-guiding optical elements need to be collimated before being incident on a waveguide for propagation, and after being coupled out of the waveguide, they enter the human eye for imaging.

[0003] When coupling light out of a light guide, a light outcoupling device is often used to couple the light out of the light guide through reflection. Existing light outcoupling devices often utilize an array of reflective surfaces that are evenly spaced and arranged, extending across the surface. However, such systems can exhibit significant transmittance drops and uneven light intensity distribution at different locations. Summary of the Invention

[0004] The present application provides an optical device and a near-eye display device to improve the use effect of the optical device.

[0005] The present application provides an optical device, which includes: a light guide, a light coupling device arranged at one end of the light guide, and a light coupling device arranged at the other end opposite to the light guide; wherein,

[0006] The light outcoupling device includes a plurality of parallel surfaces, each of which is inclined relative to the total internal reflection surface of the light guide; the plurality of surfaces are spaced apart along the length of the light guide, wherein the spacing between the plurality of surfaces gradually increases along a first direction; the first direction is a direction away from the light incoupling device;

[0007] Along the first direction, the surface farthest from the light coupling device is a total reflection surface, and the remaining surfaces are partially transmissive and partially reflective sheets.

[0008] In the above technical solution, by adjusting the arrangement spacing of the surfaces, the situation where light passes through adjacent surfaces during the process of emitting from the light guide is reduced, thereby improving the effect of light when emitting, thereby improving the transmittance of light, improving the uniformity of light, and thus improving the use effect of the optical device.

[0009] In a specific embodiment, along the first direction, among any adjacent surfaces, the surface close to the light coupling device is the first surface, and the surface far from the light coupling device is the second surface; then the distance between the first surface and the second surface satisfies:

[0010] Along the second direction, the edge light reflected from one end of the second surface away from the light emitting surface of the light guide does not pass through the first surface or only passes through the end point of the first surface close to the light emitting surface of the light guide on the path of exiting the light guide; wherein, the second direction is the thickness direction of the light guide.

[0011] In a specific embodiment, the interval H between any two adjacent surfaces satisfies:

[0012]

[0013] Wherein, L is the dimension of the surface along the second direction, which is the thickness direction of the light guide; n is the refractive index of the light guide; a is the angle between the surface and the total internal reflection surface of the light guide; b is the emission angle of the edge light when it passes through the first surface close to the end point of the light output surface of the light guide; k is the processing error, which is between -0.3 mm and +0.3 mm.

[0014] In a specific possible implementation manner, the surface is embedded in the light guide.

[0015] In a specific embodiment, the total internal reflection surface includes a first total internal reflection surface and a second total internal reflection surface arranged parallel to each other; the light coupled into the light guide member by the light coupling device is totally reflected by the first total internal reflection surface and the second total internal reflection surface to the light coupling device; wherein,

[0016] Along the second direction, the plurality of surfaces in the light outcoupling device are spaced apart from the first total internal reflection surface and the second total internal reflection surface by gaps.

[0017] In a specific embodiment, the gap between the surface and the first total internal reflection surface is equal to the gap between the surface and the second total internal reflection surface.

[0018] In a specific embodiment, along the second direction, the size of the surface and the size between the first total internal reflection surface and the second total internal reflection surface satisfy:

[0019] The light passing through the surface close to the first total internal reflection surface is reflected by the first total internal reflection surface and transmits through the surface, and then reflected by the second total internal reflection surface to another adjacent surface without transmitting through the surface again.

[0020] In a specific embodiment, along the second direction, the vertical distance between the first total internal reflection surface and the second total internal reflection surface is d; the vertical distance between the two ends of the surface is L; then:

[0021]

[0022]

[0023] In a second aspect, a near-eye display device is provided, comprising a light generator and any one of the optical devices described above; wherein,

[0024] The light emitted by the light generator is incident on the light guide of the optical device.

[0025] In the above technical solution, by adjusting the arrangement spacing of the surfaces, the situation where light passes through adjacent surfaces during the process of emitting from the light guide is reduced, thereby improving the effect of light during emission and further improving the use effect of the optical device.

[0026] In a specific embodiment, the light generator is any one of an optical collimator, a light source generator assembly, and an image source. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a usage scenario of an optical component in the prior art;

[0028] Figure 2 A schematic diagram of light outcoupling of a light guide in the prior art;

[0029] Figure 3 A schematic structural diagram of an optical device provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the relationship between the surfaces of the optical device provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the surface arrangement provided in an embodiment of the present application;

[0032] Figure 6 A schematic structural diagram of another optical device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0035] To facilitate understanding of the optical device provided in the embodiments of the present application, its application scenario is first described. The display device provided in the embodiments of the present application is applied to different near-eye display systems such as AR (Augmented Reality, enhanced display technology) or VR (Virtual Reality, virtual display technology) to realize virtual display. However, current near-eye display systems generally suffer from light loss when light is coupled out of the light guide, which affects the customer's viewing experience.

[0036] like Figure 1 As shown in Figure 1 A schematic diagram of an application scenario of an optical device in the prior art is shown. The existing optical device includes a light guide 1, a light coupling device 2, a light coupling device 3, and a light generator 9. The light generator 9 is used to emit light for displaying an image. The light coupling device 2 is used to couple the light emitted by the light generator 9 into the light guide 1. The light guide 1 is used to propagate light and has two oppositely arranged total internal reflection surfaces. The light in the light guide 1 can propagate light by total internal reflection of the total internal reflection surfaces. The light coupling device 3 is used to couple the light in the light guide 1 out to the user's eyes so that the user can observe the image displayed by the light generator.

[0037] For reference Figure 2 As shown in FIG, the light outcoupling device 3 comprises a plurality of parallel surfaces. When the plurality of parallel surfaces couple out light, the outcoupling light is likely to pass through adjacent surfaces. Figure 2 For example, the surface shown in FIG. 4 includes the first surface 4, the second surface 5, and the third surface 6. The first surface 4 is the surface away from the light coupling device 3. During the propagation of the light coupled out through the first surface 4, part of the light only passes through the second surface 5 (e.g., Figure 2), part of the light passes through the second surface 5 and the third surface 6 (as shown by the dotted line in FIG). Figure 2 ), part of the light is directly coupled out of the light guide 1 (as shown in the dotted line in FIG). Figure 2 As a result, the energy of the light coupled out of the first surface 4 is uneven, affecting the viewing experience of the user.

[0038] To this end, an embodiment of the present application provides an optical device for improving the viewing angle effect and miniaturization of a display device, which will be described in detail below with reference to specific drawings and embodiments.

[0039] refer to Figure 3 As shown in Figure 3 The schematic diagram of the structure of the optical device provided by the embodiment of the present application is shown. The optical device provided by the embodiment of the present application includes a light guide 10, a light coupling device 20 and a light coupling device 30. Among them, the light guide 10 is used to propagate light by total internal reflection. The light guide 10 is a long strip structure with total internal reflection surfaces on two opposite sides. The light entering the light guide 10 propagates in the light guide 10 by total reflection through the two total internal reflection surfaces. The light coupling device 20 and the light coupling device 30 are arranged at both ends of the light guide 10, and are used to couple light from outside the light guide 10 into the light guide 10 for propagation, and to couple light in the light guide 10 out of the light guide 10 (coupling out from the light output surface of the light guide 10).

[0040] To facilitate understanding of the optical device provided in the embodiment of the present application, the first direction and the second direction are first defined. The first direction is the length direction of the light guide 10. In the embodiment of the present application, the first direction is from the light coupling device 20 to the light coupling device 30, that is, the first direction is the direction away from the light coupling device 20. The second direction is the thickness direction of the light guide 10, that is, the arrangement direction of the two total internal reflection surfaces. Figure 3 It can be seen that the first direction is perpendicular to the second direction.

[0041] Continue to refer Figure 3 The light coupling device 20 is used to couple light emitted by the light generator into the light guide 10. The light coupling device 20 comprises a surface that is inclined relative to the total internal reflection surface. When light enters the light guide 10, it is reflected by the light coupling device 20 onto the total internal reflection surface of the light guide 10. The light is then reflected by the two total internal reflection surfaces to propagate within the light guide 10. The configuration of the light coupling device 20 will not be further described in this application; it is sufficient that the light coupling device 20 couples light from outside the light guide 10 into the light guide 10.

[0042] When light guide 10 propagates light, it does so by total reflection on two total internal reflection surfaces. Exemplarily, the total internal reflection surfaces include a first total internal reflection surface 11 and a second total internal reflection surface 12, which are arranged parallel to each other. Light coupled into light guide 10 via light coupling device 20 is then totally reflected by first and second total internal reflection surfaces 11, 12 to light coupling device 30. First total internal reflection surface 11 and light exit surface 12 are located on the same side as the light guide 10.

[0043] The light outcoupling device 30 is arranged at a position opposite to the light incoupling device 20, and the two are arranged at opposite ends of the light guide 10. The light outcoupling device 30 is used to couple the light out to the user's eyes so that the user can see the light emitted by the light generator. In the specific setting, the light outcoupling device 30 includes a plurality of surfaces 31. When the plurality of surfaces 31 are arranged, the arrangement direction thereof is spaced apart along the length direction of the light guide 10. Among the plurality of surfaces 31, the surface 31 farthest from the light incoupling device 20 along the first direction is a total reflection surface 31, and the remaining surfaces 31 are partially transmissive and partially reflective sheets. Figure 3 Taking the five surfaces 31 shown in FIG as an example, the surface 31 farthest from the light coupling device 20 is a fully reflective surface, while the remaining four surfaces 31 are semi-transmissive and semi-reflective surfaces. Of course, in the embodiment of the present application, the surface 31 farthest from the light coupling device 20 may also be a partially reflective and partially transmissive surface, but its reflectivity is higher than its transmittance.

[0044] Furthermore, the multiple surfaces 31 are all inclined relative to the total internal reflection surface of the light guide 10, and the inclination direction is opposite to the surface 31 of the light coupling device 20. The inclination angle of the surface 31 of the light coupling device 30 is not specifically limited in the present embodiment; it is sufficient to couple light out to the human eye. Furthermore, when the multiple surfaces 31 are arranged within the light guide 10, they are arranged in parallel, meaning that each surface 31 has the same inclination angle relative to the total internal reflection surface.

[0045] When the surface 31 is prepared on the light guide 10, the surface 31 can be embedded in the light guide 10. For example, the surface 31 and the light guide 10 can be fixedly connected by bonding, that is, the light guide 10 is spliced ​​together by multiple components, and the surface 31 is embedded between two components, thereby forming an arrangement of surface 31, component, surface 31, component, ...

[0046] In the specific arrangement, along the first direction, the intervals between the multiple surfaces 31 gradually increase. Figure 3 Taking the spacing of the five surfaces 31 shown in FIG as an example, d1<d2<d3<d4 is satisfied. Figure 3In the example of light shown in FIG, the purpose of using a plurality of surfaces 31 arranged in a gradually increasing manner is to reduce the chance of light passing through adjacent surfaces 31 when reflected by a surface 31, thereby ensuring that the energy of light reflected from each surface 31 is relatively balanced and improving the imaging effect of the optical device. By adjusting the spacing between the surfaces 31, the chance of light passing through adjacent surfaces 31 when exiting the light guide 10 is reduced, thereby improving the light's effect during exit, and thereby enhancing the performance of the optical device.

[0047] For ease of understanding, the arrangement of the surface 31 provided in the embodiment of the present application is described in detail below. Figure 4 As shown in FIG, for convenience of description, two arbitrary adjacent surfaces 31 are taken as an example. The two surfaces 31 are respectively named as a first surface 311 and a second surface 312. The first surface 311 is the surface 31 of any adjacent surfaces 31 that is closer to the light coupling device 20 along the first direction; the second surface 312 is the surface 31 of any adjacent surfaces 31 that is farther away from the light coupling device 20 along the first direction.

[0048] by Figure 4 Taking the first surface 311 and the second surface 312 shown in the figure as an example, the first surface 311 is close to the light coupling device 20, and the second surface 312 is far away from the light coupling device 20. When the first surface 311 and the second surface 312 are specifically arranged, the distance between the first surface 311 and the second surface 312 satisfies the following: along the second direction, the edge light reflected from the end of the second surface 312 away from the light exit surface of the light guide 10 does not pass through the first surface 311 on the way out of the light guide 10, or only passes through the end point of the first surface 311 close to the light exit surface of the light guide 10; wherein the second direction is the thickness direction of the light guide 10.

[0049] For the convenience of description, the end of the first surface 311 close to the light emitting surface of the light guide 10 is named as end point A, and the end of the second surface 312 away from the light emitting surface of the light guide 10 is named as end point B. The above distance is limited to the fact that the edge light reflected by end point A only passes through end point B on the path (light coupling path) of the edge light reflected from the second surface 312 when it propagates out of the light guide 10, or does not pass through the first surface 311. When the edge light reflected from the second surface 312 does not pass through end point B or only passes through end point B, the light at other angles will definitely not pass through the first surface 311 when reflected, so that the energy of the light coupled out through the second surface 312 is balanced (all directly coupled out, and do not pass through other surfaces 31 on the coupling path). Figure 2As can be seen from the light outcoupling path in the prior art shown in , the optical device provided in the embodiment of the present application can ensure that the light reflected by the same surface 31 can be transmitted to the user's eyes along the same path when the surfaces 31 are arranged at intervals, thereby ensuring the uniformity of the light energy and improving the display effect of the optical device.

[0050] For further understanding, when the above surfaces 31 are arranged, the distance between the surfaces 31 gradually increases in the direction away from the light coupling device 20. Figure 5 Reference lines are introduced in Figure 5 As shown in , a reference line along the second direction is constructed with the endpoint A of each surface 31. The four reference lines are L1, L2, L3, and L4. Then, in the direction away from the light coupling device 20, the distance between the surfaces 31 changes to meet the following conditions: in the direction away from the light coupling device 20, point B of the surface 31 gradually approaches the reference line from the side of the reference line away from the light coupling device 20, and continues to change to the side of the reference line close to the light coupling device 20, and then gradually moves away from the reference line. Figure 5 Take the endpoints B1, B2, B3, and B4 of the surface 31 in the example (B1 to B4 are arranged in a direction away from the light coupling device), where B1 is located on the left side of the reference line L1, B2 is located on the left side of the reference line L2, and the distance between B2 and L2 is smaller than the distance between B1 and L1. B3 is located on the right side of the reference line L3, and B4 is also located on the right side of the reference line L4, and the distance between B3 and L3 is smaller than the distance between B4 and L4. Figure 3 and Figure 4 As shown in , in the arrangement of surfaces 31 formed by the above-mentioned distance change, the edge light reflected by the surface 31 may not pass through the adjacent surface 31 when being coupled out, so that the energy of the light reflected by the same surface 31 may be almost equal, thereby ensuring the viewing effect for the user.

[0051] As a specific example, the interval H between any two adjacent surfaces 31 satisfies:

[0052]

[0053] Among them, L is the dimension of surface 31 along the second direction, n is the refractive index of light guide 10; a is the angle between surface 31 and the total internal reflection surface of light guide 10; b is the emission angle of edge light when it passes through the first surface 311 close to the end point of the light output surface of light guide 10; k is the processing error, k is between -0.3mm and +0.3mm.

[0054] The b in the formula can be calculated by the distance between the light guide 10 and the surface 31 and the user's eyes. Specifically, if the distance D1 between the human eye and the light guide 10 is known, and the distance D2 between the edge of the surface 31 and the optical axis of the human eye is known, the light output angle b corresponding to different surfaces 31 is calculated as: arctan(D2 / D1). The calculated b value is then substituted into the above formula. Since a and the refractive index of the light guide 10 are both known data in the formula, the distance between any two adjacent surfaces 31 can be calculated, thereby determining the spacing between each surface 31.

[0055] It should be understood that the processing error k value provided in the embodiment of the present application is the error generated during production and processing, which can be different error values ​​such as -0.3mm, -0.2mm, -0.1mm, 0mm, 0.1mm, 0.2mm, and 0.3mm.

[0056] In the embodiment of the present application, the consideration is that light does not pass through other surfaces 31 when it is reflected from the surface 31 and exits the light guide 10. Furthermore, the consideration is given to the uniformity of light output from the light guide 10, thereby reducing the possibility of light not fully covering the entire light guide 10. Therefore, when arranging the surfaces 31 of the light outcoupling device 30, the spacing between the surfaces 31 is arranged using the arrangement described above, where the edge light passes through the endpoints of adjacent surfaces 31 but does not pass through the surfaces 31.

[0057] In the above embodiment, the spacing arrangement method in which the surfaces 31 extend to the first total internal reflection surface 11 and the second total internal reflection surface 12 is used. That is, the two ends of the surface 31 along the second direction are located at the first total internal reflection surface 11 and the second total internal reflection surface 12, respectively. When the surfaces 31 are arranged in this manner, the spacing between the surfaces 31 satisfies the arrangement rule. When the surfaces 31 do not completely cover the light guide member 10 along the second direction, the multiple surfaces 31 in the light outcoupling device 30 along the second direction are separated from the first total internal reflection surface 11 and the second total internal reflection surface 12 by gaps.

[0058] In a specific example, the gap between the surface 31 and the first total internal reflection surface 11 is equal to the gap between the surface 31 and the second total internal reflection surface 12 .

[0059] On the path of light propagation, there will also be Figure 6The scenario shown in . After any light passes through the end of the surface 31 and propagates to the first total internal reflection surface 11, it then transmits through the surface 31 and propagates to the second total internal reflection surface 12. It is reflected again to the surface 31 by the second total internal reflection surface 12. When the light passes through the surface 31 again, if the light passes through the surface 31 again, part of the light will be reflected by the surface 31 (coupled out of the light guide 10), and part will be transmitted through the surface 31 and propagate to the next surface 31. That is, the same light passes through the same surface 31 twice during the propagation process, thereby reducing the energy of the surface 31. As for the other light rays of the light guide 10, they only pass through the same surface 31 once during the propagation process. Therefore, when these two light rays are coupled out of the light guide 10, energy imbalance is likely to occur (the light rays that pass through the surface 31 twice will lose energy), thereby affecting the display effect.

[0060] To this end, when the optical device provided in the embodiment of the present application is specifically configured, along the second direction, the size of the surface 31 and the size between the first total internal reflection surface 11 and the second total internal reflection surface 12 satisfy:

[0061] Light will be emitted twice consecutively from the same semi-transparent and semi-reflective surface. This situation will also affect the uniformity of light propagation due to the second emission. For example, light passing through surface 31 close to the first total internal reflection surface 11 is reflected by the first total internal reflection surface 11 and transmitted through the surface 31, and then reflected by the second total internal reflection surface 12 to the path of another adjacent surface 31, without being transmitted through surface 31 again. That is, when the light guide 10 and surface 31 are specifically set, the distance between the light guide 10 and surface 31 is sufficient to ensure that the light only passes through the same surface 31 once, so as to ensure that the energy of the light is uniform during propagation (the optical components passed through on the path are consistent).

[0062] In a specific implementation, along the second direction, the vertical distance between the first total internal reflection surface 11 and the second total internal reflection surface 12 is d; the vertical distance between the two ends of the surface 31 is L; then:

[0063]

[0064]

[0065] In the above formula, when the surface 31 does not extend to the first total internal reflection surface 11 and the second total internal reflection surface 12 along the second direction, the distance between the surface 31 and the two total internal reflection surfaces of the light guide 10 needs to satisfy the above formula to ensure that the energy of the light is relatively balanced during the propagation process, so as to ensure the final light output effect of the device.

[0066] Combine Figure 6As can be seen from the light shown in , when d and L meet the above-mentioned limitations, it is guaranteed that the light will not pass through the surface 31 twice. It should be understood that when there is a gap between the surface 31 and the two total internal reflection surfaces of the light guide 10, the rules for the gap between the corresponding surfaces 31 can also be applied to the example of the distance between the surface 31 and the total internal reflection surface of the light guide 10.

[0067] In yet another embodiment, surface 31 may be separated from only one of the total internal reflection surfaces by a gap. For example, one end of surface 31 intersects with first total internal reflection surface 11, while the other end is separated from second total internal reflection surface 12 by a gap. When the above arrangement is adopted, the above-mentioned energy imbalance also occurs when light passing through the end point of surface 31 close to the first total internal reflection surface 11 propagates through the first total internal reflection surface 11 (without being reflected and coupled out by surface 31), propagates to the second total internal reflection surface, and is reflected back to surface 31 by the second total internal reflection surface 12. For this reason, when setting surface 31, the spacing between surface 31 and second total internal reflection surface 12 also satisfies that light only passes through surface 31 once, thereby ensuring uniformity of light during propagation.

[0068] The present application also provides a near-eye display device, comprising a light generator and any of the aforementioned optical devices; wherein light emitted by the light generator is incident upon a light guide 10 of the optical device. In the present application, the light generator is any of an optical collimator, a light source generator assembly, and an image source.

[0069] In the above technical solution, by adjusting the arrangement spacing of the surfaces 31, the situation where light passes through adjacent surfaces 31 during the process of emitting from the light guide 10 is reduced, thereby improving the effect of light when emitting, and further improving the use effect of the optical device.

[0070] The one or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification shall be included within the scope of protection of this disclosure.

[0071] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An optical device, characterized in that: include: A light guide, a light coupling device disposed at one end of the light guide, and a light coupling device disposed at the other end opposite to the light guide; wherein, The light outcoupling device includes a plurality of parallel surfaces, each of which is inclined relative to the total internal reflection surface of the light guide; the plurality of surfaces are spaced apart along the length of the light guide, wherein the spacing between the plurality of surfaces gradually increases along a first direction; the first direction is a direction away from the light incoupling device; Along the first direction, the surface farthest from the light coupling device is a total reflection surface, and the remaining surfaces are partially transmissive and partially reflective sheets.

2. The optical device according to claim 1, wherein Along the first direction, among any adjacent surfaces, the surface close to the light coupling device is the first surface, and the surface farthest from the light coupling device is the second surface; then the distance between the first surface and the second surface satisfies: Along the second direction, the edge light reflected from one end of the second surface away from the light emitting surface of the light guide does not pass through the first surface or only passes through the end point of the first surface close to the light emitting surface of the light guide on the path of exiting the light guide; wherein, the second direction is the thickness direction of the light guide.

3. The optical device according to claim 2, wherein: The interval H between any two adjacent surfaces satisfies: Wherein, L is the dimension of the surface along the second direction, which is the thickness direction of the light guide; n is the refractive index of the light guide; a is the angle between the surface and the total internal reflection surface of the light guide; b is the emission angle of the edge light when it passes through the first surface close to the end point of the light output surface of the light guide; k is the processing error, which is between -0.3 mm and +0.3 mm.

4. The optical device according to claim 3, characterized in that The surface is embedded in the light guide.

5. The optical device according to claim 2, wherein: The total internal reflection surface includes a first total internal reflection surface and a second total internal reflection surface arranged parallel to each other; the light coupled into the light guide member by the light coupling device is totally reflected by the first total internal reflection surface and the second total internal reflection surface to the light coupling device; wherein, Along the second direction, the plurality of surfaces in the light outcoupling device are spaced apart from the first total internal reflection surface and the second total internal reflection surface by gaps.

6. The optical device according to claim 5, characterized in that A gap between the surface and the first total internal reflection surface is equal to a gap between the surface and the second total internal reflection surface.

7. The optical device according to claim 6, characterized in that Along the second direction, the size of the surface and the size between the first total internal reflection surface and the second total internal reflection surface satisfy: The light passing through the surface close to the first total internal reflection surface is reflected by the first total internal reflection surface and transmits through the surface, and then reflected by the second total internal reflection surface to another adjacent surface without transmitting through the surface again.

8. The optical device according to claim 7, wherein: Along the second direction, the vertical distance between the first total internal reflection surface and the second total internal reflection surface is d; the vertical distance between the two ends of the surface is L; then:

9. A near-eye display device, characterized in that: It comprises a light generator and an optical device according to any one of claims 1 to 8; wherein, The light emitted by the light generator is incident on the light guide of the optical device.

10. The near-eye display device according to claim 9, wherein: The light generator is any one of an optical collimator, a light source generator assembly, and an image source.

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