Light guide assembly and electronic device

Abstract

The application discloses a light guide assembly and an electronic device. The light guide assembly comprises: a light guide member comprising a first part and a second part oppositely arranged in a first direction and connected to each other; a first grating and a second grating arranged at a side of the first part away from the second part, light passing through the first grating and the light guide member and then emitted from the second grating; a first linear polarizer arranged between the first part and the second part, a projection of the first linear polarizer in the first direction and the second grating at least partially overlap; and a quarter-wave plate arranged between the first linear polarizer and the second grating.

Description

Technical Field

[0001] This application relates to the field of electronic device technology, and in particular to a light guide component and an electronic device. Background Technology

[0002] Diffractive waveguides utilize diffraction gratings as light coupling devices, combining the total internal reflection characteristics of waveguides with the diffraction characteristics of diffraction gratings to achieve large field of view and large exit pupil image output. As a result, they are applied to the next generation of AR (Augmented Reality) glasses systems. Moreover, they have the advantages of being more compact in overall weight and size, which can effectively reduce the thickness and weight of display systems.

[0003] However, in reality, when light propagates inside the optical waveguide, some of the light will leak to the outside at the coupling grating. Summary of the Invention

[0004] This application provides a light guide component and an electronic device, which can improve the light leakage problem that exists in the propagation of light in the light guide component in the prior art.

[0005] In a first aspect, embodiments of this application provide a light guide assembly, comprising: a light guide member including a first portion and a second portion disposed opposite to and connected to each other in a first direction; a first grating and a second grating, spaced apart on the side of the first portion away from the second portion, wherein light passes through the first grating and the light guide member and is emitted from the second grating; a first linear polarizer disposed between the first portion and the second portion, wherein the orthographic projection of the first linear polarizer in the first direction and the second grating at least partially overlap; and a quarter-wave plate disposed between the first linear polarizer and the second grating.

[0006] Secondly, embodiments of this application provide an electronic device including the light guide component described in the first aspect embodiment.

[0007] Thus, in the light guide assembly and electronic device provided in this application embodiment, the light guide assembly includes a light guide element, a first grating, a second grating, a first linear polarizer, and a quarter-wave plate. The light guide element includes a first part and a second part connected to each other. The first linear polarizer is disposed between the first part and the second part, and the orthographic projection of the first linear polarizer in a first direction at least partially overlaps with the second grating. The quarter-wave plate is disposed between the first linear polarizer and the second grating. Light is coupled into the light guide element through the first grating, and the light propagates towards the second grating in the light guide element by total internal reflection. After passing through the first linear polarizer, the light forms linearly polarized light, and after passing through the quarter-wave plate, it forms circularly polarized light. Circularly polarized light is coupled out from outside the second grating to form an image. Another portion of circularly polarized light satisfies the condition for total internal reflection and continues to propagate along the path of total internal reflection. The polarization direction of the reflected circularly polarized light is opposite to that of the incident light. This portion of polarized light passes through a quarter-wave plate and becomes linearly polarized light orthogonal to the direction of the first linear polarizer. It cannot pass through the first linear polarizer and is completely reflected back to the second grating at the first linear polarizer. There is also a portion of circularly polarized light that neither couples out to the outside nor satisfies the condition for total internal reflection. This portion of circularly polarized light passes through a quarter-wave plate and becomes linearly polarized light orthogonal to the direction of the first linear polarizer. It cannot pass through the first linear polarizer and is completely reflected back to alleviate the problem of light leakage.

[0008] Therefore, in this embodiment, by setting a first linear polarizer between the first part and the second part, and the orthographic projection of the first linear polarizer in the first direction at least partially overlaps with the second grating, and by setting a quarter-wave plate between the first linear polarizer and the second grating, the linearly polarized light transmitted through the first linear polarizer cannot pass through the first linear polarizer again after its phase is changed by the quarter-wave plate. Therefore, the combination of the first linear polarizer and the quarter-wave plate can alleviate the light leakage problem when the light propagates in the light guide. Furthermore, since the light is reflected between the first linear polarizer and the second grating, the reflection path of the light is shortened, and the number of reflected light rays per unit area is increased. This helps to increase the number of exit pupil images per unit area and improve the display effect in the eye. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of a light guide assembly according to some embodiments of this application;

[0011] Figure 2 This is a schematic diagram of the structure of a light guide assembly according to other embodiments of this application;

[0012] Figure 3 This is a schematic diagram of the structure of a light guide assembly according to some embodiments of this application;

[0013] Figure 4 This is a schematic diagram of the structure of a light guide assembly according to some embodiments of this application;

[0014] Figure 5 This is a schematic diagram of the structure of a light guide assembly according to some embodiments of this application.

[0015] Explanation of icon numbers:

[0016] 100. Light guide assembly;

[0017] 110. Light guide; 111. First part; 112. Second part; 1111. First sub-part; 1112. Second sub-part;

[0018] 120, First grating; 130, Second grating; 140, First linear polarizer; 150, Second linear polarizer; 160, Third linear polarizer; 170, Fourth linear polarizer; 180, Quarter-wave plate; X, First direction. Detailed Implementation

[0019] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] In the description of this application, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "middle", "rear", "left", "right", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a light guide assembly according to some embodiments of this application.

[0024] Firstly, such as Figure 1 As shown, this application embodiment provides a light guide assembly 100, which includes a light guide 110, a first grating 120, a second grating 130, a first linear polarizer 140, and a quarter-wave plate 180. The light guide 110 includes a first portion 111 and a second portion 112 that are disposed opposite to and connected to each other in a first direction X. The first grating 120 and the second grating 130 are spaced apart on the side of the first portion 111 away from the second portion 112. Light passes through the first grating 120 and the light guide 110 and is emitted from the second grating 130. The first linear polarizer 140 is disposed between the first portion 111 and the second portion 112, and the orthographic projection of the first linear polarizer 140 in the first direction X at least partially overlaps with the second grating 130. The quarter-wave plate 180 is disposed between the first linear polarizer 140 and the second grating 130.

[0025] In the light guide assembly 100 and electronic device provided in this application embodiment, the light guide assembly 100 includes a light guide element 110, a first grating 120, a second grating 130, a first linear polarizer 140, and a quarter-wave plate 180. The light guide element 110 includes a first portion 111 and a second portion 112 connected to each other. The first linear polarizer 140 is disposed between the first portion 111 and the second portion 112. The orthographic projection of the first linear polarizer 140 in the first direction X at least partially overlaps with the second grating 130. The quarter-wave plate 180 is disposed between the first linear polarizer 140 and the second grating 130. Light is coupled into the light guide element 110 through the first grating 120. The light propagates towards the second grating 130 within the light guide element 110 by total internal reflection. After passing through the first linear polarizer 140, the light forms linearly polarized light. After passing through the quarter-wave plate 180, circularly polarized light is formed. Part of the circularly polarized light is coupled out to the outside of the second grating 130 to form an image. Another part of the circularly polarized light satisfies the condition of total internal reflection and continues to propagate along the total internal reflection path. The polarization direction of the reflected circularly polarized light is opposite to that of the incident light. This part of the circularly polarized light becomes linearly polarized light orthogonal to the direction of the first linear polarizer 140 after passing through the quarter-wave plate 180. It cannot pass through the first linear polarizer 140 and is completely reflected back to the second grating 130 at the first linear polarizer 140. There is also a part of the circularly polarized light that neither couples out to the outside nor satisfies the condition of total internal reflection. This part of the circularly polarized light becomes linearly polarized light orthogonal to the direction of the first linear polarizer 140 after passing through the quarter-wave plate 180. It cannot pass through the first linear polarizer 140 and is completely reflected back to alleviate the problem of light leakage. By setting a first linear polarizer 140 between the first part 111 and the second part 112, and the orthographic projection of the first linear polarizer 140 in the first direction X at least partially overlaps with the second grating 130, and setting a quarter-wave plate 180 between the first linear polarizer 140 and the second grating 130, the polarized light transmitted through the first linear polarizer 140 cannot pass through the first linear polarizer 140 again after the phase is changed by the quarter-wave plate 180. Therefore, the combination of the first linear polarizer 140 and the quarter-wave plate 180 can alleviate the light leakage problem when the light propagates in the light guide 110. Moreover, since the light is reflected between the first linear polarizer 140 and the second grating 130, the reflection path of the light is shortened, and the number of reflected light rays per unit area is increased. This helps to increase the number of exit pupil images per unit area and improve the display effect of the light entering the eye.

[0026] The light guide 110 disclosed in this application embodiment can be an optical waveguide structure, and the light guide 110 can also be other types of structures. This application embodiment does not limit the specific structure of the light guide 110.

[0027] The light guide 110 includes a first part 111 and a second part 112 that are disposed opposite to and connected to each other in a first direction X. The first part 111 and the second part 112 can be an integral structure, with a first linear polarizer 140 embedded between the first part 111 and the second part 112; or they can be a separate structure. In the case of a separate structure, the first part 111 and the second part 112 can be connected by means of optical adhesive bonding, with the first linear polarizer 140 bonded between the first part 111 and the second part 112. The specific shape and size of the first part 111 and the second part 112 can be flexibly designed. For example, the first part 111 and the second part 112 have the same size and shape.

[0028] The first grating 120 and the second grating 130 can be connected to the first part 111 by embedding or bonding. The first grating 120 is a coupling grating, and the second part 112 is a coupling grating. External light is diffracted into the light guide 110 through the first grating 120. The light is transmitted to the second grating 130 by total internal reflection in the light guide 110 and coupled out to the outside to form an image.

[0029] A quarter-wave plate 180 can create a 1 / 4 phase difference between ordinary and extraordinary light. For example, the quarter-wave plate 180 can be a birefringent single-crystal waveplate of a certain thickness, or a polymer or liquid crystal with stretching properties, or an etched grating, etc.

[0030] The quarter-wave plate 180 can be connected together with the first linear polarizer 140 and bonded or embedded together between the first part 111 and the second part 112; or the quarter-wave plate 180 and the first linear polarizer 140 can be spaced apart, with the quarter-wave plate 180 embedded in the first part 111.

[0031] Of the light transmitted from the first grating 120 to the second grating 130 via total internal reflection, a portion passes through the first linear polarizer 140 and becomes linearly polarized light. The polarization direction of the linearly polarized light is parallel to the polarization direction of the first linear polarizer 140. A portion of this linearly polarized light is coupled out by the second grating 130 to form an image in the outside world; for ease of understanding, this portion can be called the first ray. The other portion of light that cannot pass through the second grating 130 includes two parts: one part, which meets the condition of total internal reflection, will continue to be emitted; for ease of understanding, this portion can be called the second ray. The other part, which does not meet the condition of total internal reflection, is called the third ray. The third ray is the main ray that is prone to leakage out of the light guide 110.

[0032] In this embodiment, linearly polarized light first passes through a quarter-wave plate 180 to become circularly polarized light, then reaches the second grating 130, where it is split into the first ray, the second ray, and the third ray. The third ray is reflected toward the first linear polarizer 140. During this process, the third ray passes through the quarter-wave plate 180 again to become linearly polarized light orthogonal to the direction of the first linear polarizer 140, causing the third ray to be completely reflected by the first linear polarizer 140. Thus, the first linear polarizer 140 effectively blocks light leakage from the light guide 110.

[0033] The second ray, during its reflection to the first linear polarizer 140, also passes through the quarter-wave plate 180 and becomes linearly polarized, orthogonal to the direction of the first linear polarizer 140. This causes the second ray to be completely reflected by the first linear polarizer 140 and then to the second grating 130. The first linear polarizer 140 is positioned between the first portion 111 and the second portion 112. Thus, in the first direction X, the distance between the first linear polarizer 140 and the second grating 130 is smaller than the surface of the second grating 130 and the second portion 112 facing away from the first portion 111. This shortens the reflection path of the second ray, increasing the number of reflected rays per unit area and thus increasing the number of exit pupil images per unit area. The specific distance between the first linear polarizer and the second grating 130 can be designed independently.

[0034] Optionally, the orthogonal projection of the first linear polarizer 140 in the first direction X covers the second grating 130 to enhance the effect of the first linear polarizer 140 in mitigating light leakage.

[0035] Optionally, the first linear polarizer 140 is a reflective polarizer to reflect light rays perpendicular to its optical axis.

[0036] In some embodiments, such as Figure 1 As shown, the light guide assembly 100 also includes a second linear polarizer 150, which is disposed on the side of the second portion 112 away from the first portion 111. The second linear polarizer 150 and the first linear polarizer 140 at least partially overlap in the orthographic projection of the second linear polarizer 150 and the second grating 130 in the first direction X, and the polarization directions of the second linear polarizer 150 and the first linear polarizer 140 intersect.

[0037] In these embodiments, the second linear polarizer 150 is disposed on the side of the second portion 112 away from the first portion 111. The orthographic projection of the second linear polarizer 150 and the first linear polarizer 140 in the first direction X and the second grating 130 at least partially overlap. Thus, some of the light passing through the first linear polarizer 140 will reach the second linear polarizer 150. Since the polarization directions of the second linear polarizer 150 and the first linear polarizer 140 intersect, some of the light passing through the first linear polarizer 140 will be blocked by the second linear polarizer 150, thereby further alleviating the light leakage problem of the light guide 110.

[0038] Optionally, both the first linear polarizer 140 and the second linear polarizer 150 are reflective polarizers.

[0039] Optionally, the polarization directions of the first linear polarizer 140 and the second linear polarizer 150 are perpendicular, so that light rays passing through the first linear polarizer 140 and parallel to the optical axis of the first linear polarizer 140 will be reflected at the second linear polarizer 150, thereby enhancing the utilization of light and improving the brightness and contrast of the image viewed by the user from the display side where the second grating 130 is located.

[0040] In some embodiments, such as Figure 1 As shown, the quarter-wave plate 180 and the first linear polarizer 140 are bonded together.

[0041] In these embodiments, the quarter-wave plate 180 and the first linear polarizer 140 are bonded together to simplify the fabrication process of the light guide assembly 100.

[0042] For example, the quarter-wave plate 180 and the first linear polarizer 140 are first bonded together to form an integral structure, and then this integral structure is embedded in the light guide 110, or this integral structure is attached to the first part 111 and the second part 112.

[0043] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a light guide assembly according to some embodiments of this application.

[0044] In some embodiments, such as Figure 2 As shown, a quarter-wave plate 180 and a first linear polarizer 140 are spaced apart. The first part 111 includes a first sub-part 1111 and a second sub-part 1112 that are connected to each other. The first linear polarizer 140 is disposed between the first sub-part 1111 and the second part 112. The quarter-wave plate 180 is disposed between the first sub-part 1111 and the second sub-part 1112. The second grating 130 is disposed on the side of the second sub-part 1112 that is away from the second part 112.

[0045] In these embodiments, the quarter-wave plate 180 and the first linear polarizer 140 are spaced apart so that they can be easily replaced if either the quarter-wave plate 180 or the first linear polarizer 140 is damaged, thereby reducing maintenance costs.

[0046] For example, a quarter-wave plate 180 and a first linear polarizer 140 are attached to both sides of the first sub-part 1111, and then the second sub-part 1112 and the second part 112 are bonded together with the first sub-part 1111.

[0047] The specific thicknesses of the second part 112, the first sub-part 1111, and the second sub-part 1112 can be set by the user.

[0048] In some embodiments, such as Figure 1 and Figure 2 As shown, at least one of the second linear polarizer 150, the first linear polarizer 140, and the quarter-wave plate 180 covers the second grating 130.

[0049] In these embodiments, at least one of the second linear polarizer 150, the first linear polarizer 140, and the quarter-wave plate 180 covers the second grating 130 to improve the light processing effect of the second linear polarizer 150, the first linear polarizer 140, and the quarter-wave plate 180, further reduce the risk of light leakage from the light guide 110, and increase the amount of light emitted at the second grating 130.

[0050] Optionally, the second linear polarizer 150, the first linear polarizer 140, and the quarter-wave plate 180 are all projected onto the second grating 130 in the first direction X, in order to further reduce the risk of light leakage from the light guide 110 and increase the amount of light emitted at the second grating 130.

[0051] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of a light guide assembly according to some embodiments of this application.

[0052] In some embodiments, such as Figure 3 As shown, at least one of the first linear polarizer 140 or the second linear polarizer 150 covers at least a portion of the first grating 120.

[0053] In these embodiments, at least one of the first linear polarizer 140 or the second linear polarizer 150 covers at least a portion of the first grating 120, thereby improving the problem of light leakage at the first grating 120 without the need for additional components.

[0054] Of the light rays entering the light guide 110 from the coupling grating, some do not meet the conditions for total internal reflection and cannot undergo total internal reflection, thus easily leaking to the outside. In this embodiment, by extending the first linear polarizer 140 or the second linear polarizer 150, the first linear polarizer 140 or the second linear polarizer 150 blocks the light rays emitted perpendicular to the optical axis of the first linear polarizer 140 or the second linear polarizer 150, thereby alleviating the light leakage problem of the light guide 110 at the first grating 120.

[0055] Optionally, the first linear polarizer 140 or the second linear polarizer 150 completely covers the first grating 120 to reduce light leakage at the first grating 120 by the light guide 110.

[0056] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a light guide assembly according to some embodiments of this application.

[0057] In some embodiments, such as Figure 4 As shown, the light guide assembly 100 also includes a third linear polarizer 160, which is disposed on the side of the second portion 112 away from the first portion 111, or the third linear polarizer 160 is disposed between the second portion 112 and the first portion 111, and the third linear polarizer 160 at least partially covers the first grating 120.

[0058] In these embodiments, the light guide assembly 100 further includes a third linear polarizer 160 disposed on the side of the second portion 112 opposite to the first portion 111, or a third linear polarizer 160 disposed between the first portion 111 and the second portion 112. The third linear polarizer 160 at least partially covers the first grating 120, thereby blocking some of the light at the first grating 120 to alleviate the light leakage problem of the light guide 110 at the first grating 120.

[0059] The third linear polarizer 160 and the second linear polarizer 150 are spaced apart, reducing the overall size of the polarizers in the light guide assembly 100 and reducing the cost of the light guide assembly 100.

[0060] Optionally, the third linear polarizer 160 completely covers the first grating 120, further reducing light leakage at the first grating 120.

[0061] In some embodiments, such as Figure 4 As shown, the third linear polarizer 160 is an absorption polarizer.

[0062] In these embodiments, the third linear polarizer 160 is an absorptive polarizer, so that the linearly polarized light perpendicular to the optical axis of the third linear polarizer 160 in the linearly polarized light formed after passing through the first grating 120 is absorbed after reaching the third linear polarizer 160, and will not be emitted from or reflected by the third linear polarizer 160. This can further alleviate the problem of light leakage at the first grating 120 when the light propagates in the light guide 110.

[0063] An absorptive polarizer can absorb linearly polarized light that is perpendicular to its optical axis, thus preventing linearly polarized light that is perpendicular to its optical axis from escaping from the absorptive polarizer, and also preventing it from being reflected by the absorptive polarizer.

[0064] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a light guide assembly according to some embodiments of this application.

[0065] In some embodiments, such as Figure 5 As shown, the light guide assembly 100 also includes a fourth linear polarizer 170. The fourth linear polarizer 170 is disposed on the side of the second portion 112 away from the first portion 111. The fourth linear polarizer 170 is disposed on the side of the second linear polarizer 150 close to the first grating 120. The fourth linear polarizer 170 and the first linear polarizer 140 at least partially overlap. The polarization directions of the fourth linear polarizer 170 and the first linear polarizer 140 are the same. The fourth linear polarizer 170 is an absorption type polarizer.

[0066] In these embodiments, the light guide assembly 100 further includes a fourth linear polarizer 170 disposed on the side of the second portion 112 away from the first portion 111. The fourth linear polarizer 170 is disposed on the side of the second linear polarizer 150 near the first grating 120. The fourth linear polarizer 170 and the first linear polarizer 140 at least partially overlap, and the polarization directions of the fourth linear polarizer 170 and the first linear polarizer 140 are the same, so that light entering the first linear polarizer 140 from the side of the first linear polarizer 140 away from the second grating 130 and being reflected by the first linear polarizer 140 will be absorbed by the fourth linear polarizer 170, thereby reducing the risk of this part of the light leaking from the light guide 110.

[0067] Optionally, the fourth linear polarizer 170 and the second linear polarizer 150 are connected to each other to prevent light from leaking out from the joint between the fourth linear polarizer 170 and the second linear polarizer 150.

[0068] Optionally, the area of ​​the fourth linear polarizer 170 is much smaller than the area of ​​the second linear polarizer 150, in order to avoid the fourth linear polarizer 170 absorbing too much light, resulting in the problem of insufficient brightness at the second grating 130.

[0069] Optionally, the fourth linear polarizer 170 may have its orthogonal projection in the first direction X at least partially cover the first grating 120 to absorb some of the light at the first grating 120 and improve the light leakage problem of the light guide 110 at the first grating 120.

[0070] Optionally, a fifth linear polarizer is provided between the first part 111 and the first grating 120. The polarization direction of the fifth linear polarizer is the same as that of the first linear polarizer 140. Then, the light rays that pass from the first grating 120 through the fifth linear polarizer to the first linear polarizer 140 will not be reflected by the first linear polarizer 140.

[0071] Secondly, embodiments of this application provide an electronic device including the light guide component described in the first aspect embodiment.

[0072] Since the electronic device provided in the second aspect of this application includes the light guide component of any of the embodiments of the first aspect described above, the electronic device provided in the second aspect of this application has the beneficial effects of the light guide component of any of the embodiments of the first aspect described above, which will not be repeated here.

[0073] It should be noted that the electronic devices disclosed in the embodiments of this application may be display panels, mobile terminals, wearable devices, VR (Virtual Reality) glasses, AR (Augmented Reality) glasses, mobile phones, tablets, game consoles, etc. The application does not limit the specific types of electronic devices.

[0074] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A light guide component, characterized in that, include: A light guide includes a first part and a second part that are disposed opposite to and connected to each other in a first direction; The first grating and the second grating are spaced apart on the side of the first part away from the second part. Light passes through the first grating and the light guide and is emitted from the second grating. A first linear polarizer is disposed between the first portion and the second portion. The orthographic projection of the first linear polarizer in the first direction at least partially overlaps with the second grating. The first linear polarizer is used to form linearly polarized light and to reflect light rays perpendicular to its optical axis direction. A quarter-wave plate is disposed between the first linear polarizer and the second grating. The quarter-wave plate is used to convert linearly polarized light into circularly polarized light, and to convert circularly polarized light into linearly polarized light orthogonal to the direction of the first linear polarizer.

2. The light guide assembly according to claim 1, characterized in that, The light guide assembly further includes a second linear polarizer, which is disposed on the side of the second portion away from the first portion. The orthographic projections of the second linear polarizer and the first linear polarizer in the first direction at least partially overlap with the second grating, and the polarization directions of the second linear polarizer and the first linear polarizer intersect.

3. The light guide assembly according to claim 1, characterized in that, The quarter-wave plate and the first linear polarizer are bonded together.

4. The light guide assembly according to claim 1, characterized in that, The quarter-wave plate and the first linear polarizer are spaced apart. The first part includes a first sub-part and a second sub-part that are connected to each other. The first linear polarizer is disposed between the first sub-part and the second part. The quarter-wave plate is disposed between the first sub-part and the second sub-part. The second grating is disposed on the side of the second sub-part that is away from the second part.

5. The light guide assembly according to claim 2, characterized in that, At least one of the second linear polarizer, the first linear polarizer, and the quarter-wave plate covers the second grating.

6. The light guide assembly according to claim 2, characterized in that, At least one of the first linear polarizer or the second linear polarizer covers at least a portion of the first grating.

7. The light guide assembly according to claim 1, characterized in that, The light guide assembly further includes a third linear polarizer, which is disposed on the side of the second portion away from the first portion, or the third linear polarizer is disposed between the second portion and the first portion, and the third linear polarizer at least partially covers the first grating.

8. The light guide assembly according to claim 7, characterized in that, The third linear polarizer is an absorption polarizer.

9. The light guide assembly according to claim 2, characterized in that, The light guide assembly further includes a fourth linear polarizer, which is disposed on the side of the second portion away from the first portion. The fourth linear polarizer is disposed on the side of the second linear polarizer close to the first grating. The fourth linear polarizer and the first linear polarizer at least partially overlap. The polarization directions of the fourth linear polarizer and the first linear polarizer are the same. The fourth linear polarizer is an absorption polarizer.

10. An electronic device, characterized in that, Includes the light guide component described in any one of claims 1-9.

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