Near-eye display device

Abstract

A near-eye display device includes a waveguide structure, a functional lens, and an adhesive structure. The waveguide structure includes stacked waveguide lenses and a first cover layer. The functional lens is disposed on the side of the waveguide lenses away from the first cover layer. The adhesive structure is disposed between the functional lens and the waveguide structure and includes an adhesive layer and an electrode layer located on at least one side of the adhesive layer. The adhesive layer is configured to change its adhesion under the control of the electrode layer. This near-eye display device simplifies the removal of the functional lens, facilitating its replacement, maintenance, and use.

Description

Technical Field

[0001] Embodiments of this disclosure relate to a near-eye display device. Background Technology

[0002] Currently, augmented reality (AR) glasses, which can overlay virtual objects onto real-world environments in real time, have attracted widespread attention.

[0003] Augmented reality display technology based on optical waveguides requires transmitting the image displayed on a small screen through an optical waveguide to the human eye, allowing the user to observe the image. The principle of optical waveguides involves light emitted from an optical engine being coupled into the optical waveguide through a grating, propagating through the waveguide via total internal reflection, and finally being coupled out at the grating location to the human eye. Summary of the Invention

[0004] At least one embodiment of this disclosure provides a near-eye display device, which includes a waveguide structure, a functional lens, and an adhesive structure. The waveguide structure includes stacked waveguide lenses and a first cover layer. The functional lens is disposed on the side of the waveguide lens away from the first cover layer. The adhesive structure is disposed between the functional lens and the waveguide structure and includes an adhesive layer and an electrode layer located on at least one side of the adhesive layer. The adhesive layer is configured to change its viscosity under the control of the electrode layer.

[0005] For example, according to an embodiment of this disclosure, the electrode layer includes a first electrode layer disposed on the adhesive layer near the waveguide structure side and a second electrode layer disposed on the adhesive layer near the functional lens side, wherein the first electrode layer and the second electrode layer are configured to apply a voltage to the adhesive layer to control the adhesive layer to change its viscosity.

[0006] For example, according to an embodiment of this disclosure, the first electrode layer includes a first main electrode portion and a first connecting electrode portion; the first main electrode portion is sandwiched between the adhesive layer and the waveguide structure, and the first connecting electrode portion is connected to the first main electrode portion and configured to connect a control circuit.

[0007] For example, according to an embodiment of this disclosure, the orthographic projection of the adhesive layer on the first main electrode portion is located inside the first main electrode portion.

[0008] For example, according to an embodiment of this disclosure, the waveguide structure further includes a second cover layer disposed on the side of the waveguide lens away from the first cover layer, the bonding structure is disposed between the functional lens and the second cover layer, the second cover layer includes a first surface that is attached to the first main electrode portion and a first side surface adjacent to the first surface, and the first connecting electrode portion extends to the first side surface.

[0009] For example, according to an embodiment of this disclosure, the second electrode layer includes a second main electrode portion and a second connecting electrode portion; the second main electrode portion is sandwiched between the adhesive layer and the functional lens, and the second connecting electrode portion is connected to the second main electrode portion and configured to connect a control circuit; wherein, the orthographic projection of the adhesive layer on the second main electrode portion is located inside the second main electrode portion.

[0010] For example, according to an embodiment of this disclosure, the functional lens includes a second surface that is attached to the second main electrode portion and a second side surface adjacent to the second surface, wherein the second connecting electrode portion extends to the second side surface.

[0011] For example, according to an embodiment of this disclosure, the waveguide structure includes an insertion region and an exit region, the functional lens and the adhesive layer are at least disposed in the exit region, the adhesive layer is planar, and the visible light transmittance of the adhesive structure in the exit region is greater than 70%.

[0012] For example, according to an embodiment of this disclosure, the waveguide structure includes an insertion region and an exit region, the functional lens is at least disposed in the exit region, the adhesive layer is linear or annular extending along the edge of the exit region, and the materials of the first electrode layer and the second electrode layer include metal or alloy.

[0013] For example, according to an embodiment of this disclosure, the waveguide structure includes an insertion region and an exit region, the functional lens is at least disposed in the exit region, the waveguide structure further includes a second cover layer disposed on the side of the waveguide lens away from the first cover layer, the second cover layer is at least disposed in the insertion region and hollowed out in the exit region, and the bonding structure includes a first portion sandwiched between the second cover layer and the functional lens and a second portion sandwiched between the waveguide lens and the functional lens.

[0014] For example, according to an embodiment of this disclosure, the functional lens includes a hollow portion, and the first portion is disposed in the hollow portion.

[0015] For example, according to an embodiment of this disclosure, the waveguide lens includes a third surface that is fitted to the second portion and a third side surface adjacent to the third surface, wherein the first connecting electrode portion extends to the third side surface.

[0016] For example, according to an embodiment of this disclosure, the second electrode layer is directly disposed on the functional lens, and the waveguide structure further includes a second cover layer disposed on the side of the waveguide lens away from the first cover layer, and the first electrode layer is directly disposed on the second cover layer or the waveguide lens.

[0017] For example, according to an embodiment of this disclosure, the electrode layer includes a substrate and an electrode pattern disposed on the substrate, the substrate being connected to the functional lens or the waveguide structure by an adhesive.

[0018] For example, according to an embodiment of this disclosure, when the electrode layer is not energized, the adhesive layer has a first adhesiveness, and when the electrode layer is energized to apply a voltage to the adhesive layer, the adhesive layer has a second adhesiveness, wherein the first adhesiveness is greater than the second adhesiveness. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0020] Figure 1 This is a plan view of a near-eye display device provided in at least one embodiment of the present disclosure;

[0021] Figure 2 for Figure 1 A schematic cross-sectional view of the near-eye display device along line AA;

[0022] Figure 3 for Figure 1 Another cross-sectional schematic diagram of the near-eye display device along line AA;

[0023] Figure 4 This is a plan view of another near-eye display device provided in at least one embodiment of the present disclosure;

[0024] Figure 5 for Figure 4 A schematic cross-sectional view of a near-eye display device along the BB line;

[0025] Figure 6 This is a plan view of another near-eye display device provided in at least one embodiment of the present disclosure;

[0026] Figure 7 for Figure 6 A schematic cross-sectional view of a near-eye display device along the CC line;

[0027] Figure 8 A plan view of yet another near-eye display device provided in at least one embodiment of the present disclosure;

[0028] Figure 9 for Figure 8 A schematic cross-sectional view of a near-eye display device along the DD line;

[0029] Figure 10 for Figure 2Another cross-sectional schematic diagram of the near-eye display device along line AA;

[0030] Figure 11 A cross-sectional schematic diagram of the bonding structure of a near-eye display device provided in at least one embodiment of this disclosure; and

[0031] Figure 12 This is a cross-sectional schematic diagram of another near-eye display device provided in an embodiment of this disclosure. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0033] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0034] As described above, augmented reality display technology based on optical waveguides requires transmitting the display image from a small screen through a waveguide lens before it reaches the user's eye, allowing the user to observe the image. In some embodiments, to better protect the waveguide lens, a cover plate is provided on at least one side of the waveguide lens. The cover plate can be made of materials such as resin or optical glass to protect the waveguide lens while maintaining good optical properties. The cover plate can be bonded to the waveguide lens using optically transparent adhesive (OCA). The display image from the screen illuminates the waveguide lens, and diffracts through a coupling grating within the waveguide lens, resulting in total internal reflection within the waveguide lens. Finally, the totally reflected display image exits the waveguide lens through a deflection grating and an output grating, illuminating the user's eye.

[0035] For users requiring vision correction, such as those with myopia, hyperopia, or astigmatism, a functional lens, such as a formulation lens, needs to be added between the waveguide lens and the eye to achieve clear imaging. Formulation lenses are typically secured to the waveguide lens using methods such as magnets, mechanical clips, or adhesive tape. However, the magnetic / mechanical clip method creates an air gap between the lens and the waveguide lens, compromising mechanical stability and airtightness, and also adds extra weight, affecting wearing comfort and user experience.

[0036] For adhesive tape bonding, the waveguide lens is typically bonded to the entire surface of the tape or frame adhesive. This bonding method offers better mechanical stability and sealing. However, in some implementations, because the formulation lens is fixed to the waveguide lens with tape, different users can use different formulation lenses. The same formulation lens cannot be compatible with different users, and users cannot replace the formulation lens themselves; they can only return it to the factory for replacement, which is too costly. This results in poor repairability of the formulation lens, significantly reducing production yield and increasing costs.

[0037] At least one embodiment of this disclosure provides a near-eye display device, which includes a waveguide structure, a functional lens, and an adhesive structure. The waveguide structure includes stacked waveguide lenses and a first cover layer. The functional lens is disposed on the side of the waveguide lens away from the first cover layer. The adhesive structure is disposed between the functional lens and the waveguide structure and includes an adhesive layer and an electrode layer located on at least one side of the adhesive layer. The adhesive layer is configured to change its viscosity under the control of the electrode layer.

[0038] In the near-eye display device provided in this embodiment, the adhesiveness of the bonding layer can be controlled by controlling the electrode layer. In this way, when the functional lens needs to be removed, the adhesiveness of the bonding layer can be reduced by the electrode layer, so that the functional lens can be easily, quickly and safely removed from the waveguide structure for replacement, repair and use. This can solve the problems of the above-mentioned formulation lens being difficult to repair and disassemble.

[0039] The near-eye display device of this disclosure will be described in detail below through several specific embodiments.

[0040] This disclosure provides at least one embodiment of a near-eye display device. Figure 1 A plan view of the near-eye display device is shown. Figure 2 It shows Figure 1 A schematic diagram of a cross-section of a near-eye display device along line AA, as shown in the image. Figure 1 and Figure 2 As shown, the near-eye display device includes a waveguide structure 10, a functional lens 20, and an adhesive structure 30.

[0041] The waveguide structure 10 includes stacked waveguide lenses 11 and a first cover layer 12. For example, the waveguide lens 11 includes an insertion region CL1 and an exit region CL2. The insertion region CL1 includes an insertion grating and a corresponding display device 40. The exit region CL2 includes a deflection grating and an exit grating. Light carrying the display image emitted by the display device 40 enters the waveguide lens 11 from the insertion region CL1, is diffracted by the insertion grating within the waveguide lens 11, and undergoes total internal reflection within the waveguide lens 11. Finally, the totally reflected light exits from the exit region CL2 through the deflection grating and the exit grating, and shines into the human eye through the functional lens 20, allowing the user to see a clear display image adjusted by the functional lens 20. For example, the first cover layer 12 can be in the form of a cover plate, and its material can be, for example, resin or optical glass. For example, the first cover layer 12 can be connected to the waveguide lens 11 by an adhesive layer 14.

[0042] For example, the area of ​​waveguide lens 11 other than the coupling-in region CL1 and the coupling-out region CL2 can be called the frame region N. The frame region N can be used to set adhesive layer 14 and other bonding structures, control circuits and other circuit structures, as well as other suitable auxiliary structures, which will not be elaborated here.

[0043] The functional lens 20 is located on the side of the waveguide lens 11 away from the first cover layer 12. For example, it can be a lens that can adjust light, such as a myopia lens, a hyperopia lens, or a diffuser lens. Its specific form can be adjusted according to the user's needs so that the user can see a clear display.

[0044] An adhesive structure 30 is disposed between the functional lens 20 and the waveguide structure 10 for connecting the functional lens 20 and the waveguide structure 10. The adhesive structure 30 includes an adhesive layer 31 and an electrode layer 32 / 33 located on at least one side of the adhesive layer 31. The adhesive layer 31 is configured to change its viscosity under the control of the electrode layer 32 / 33.

[0045] For example, when the adhesive layer 31 has high adhesion, the functional lens 20 and the waveguide structure 10 can be firmly connected to facilitate the safe use of the device. When the adhesive layer 31 has low adhesion, the functional lens 20 can be removed from the waveguide structure 10 for easy replacement.

[0046] For example, in some embodiments, when the electrode layers 32 / 33 are not energized, the adhesive layer 31 has a first adhesiveness, for example, a high adhesiveness; when the electrode layers 32 / 33 are energized to apply a voltage to the adhesive layer 31, the adhesive layer 31 has a second adhesiveness, for example, a lower adhesiveness, i.e., the first adhesiveness is greater than the second adhesiveness. Thus, when the electrode layers 32 / 33 are not energized, the functional lens 20 and the waveguide structure 10 can be stably connected, and the near-eye display device can be safely used by the user. When it is necessary to remove the functional lens 20 from the waveguide structure 10, the electrode layers 32 / 33 can be energized to reduce the adhesiveness of the adhesive layer 31, thereby facilitating the removal of the functional lens 20 from the waveguide structure 10.

[0047] For example, when the functional lens 20, which has been removed from the waveguide structure 10, needs to be reconnected to the waveguide structure 10, the electrode layers 32 / 33 can be de-energized to increase the adhesion of the adhesive layer 31, so that the functional lens 20 can be re-bonded to the waveguide structure 10. This allows the adhesive structure 30 to be reused.

[0048] For example, in some embodiments, the electrode layer includes a first electrode layer 32 disposed on the side of the adhesive layer 31 near the waveguide structure 10 and a second electrode layer 33 disposed on the side of the adhesive layer 31 near the functional lens 20. The first electrode layer 32 and the second electrode layer 33 are configured to apply a voltage to the adhesive layer 31 to control the adhesive layer 31 to change its viscosity. The above-described configuration of double-sided electrode layers can improve the uniformity of control over the adhesive layer 31.

[0049] For example, the voltage applied to one of the first electrode layer 32 and the second electrode layer 33 is greater than the voltage applied to the other, thereby creating a voltage difference between the first electrode layer 32 and the second electrode layer 33 to control the adhesive layer 31 to change its viscosity. For example, the adhesive layer 31 may have reduced viscosity on the side closer to the first electrode layer 32, thereby facilitating the separation of the adhesive layer 31 from the first electrode layer 32; or, the adhesive layer 31 may have reduced viscosity on the side closer to the second electrode layer 33, thereby facilitating the separation of the adhesive layer 31 from the second electrode layer 33. Thus, the adhesive layer 31 has reduced viscosity on one side, and the side with higher viscosity can still be bonded to the functional lens 20 or the waveguide structure 10 for retention and reuse.

[0050] For example, in some embodiments, the electrode layer may be disposed on only one side of the adhesive layer 31. In this case, the adhesive layer may include multiple patterned electrode patterns, such as strip electrode patterns, annular electrode patterns, etc. These electrode patterns can be subjected to different voltages to form a voltage difference, thereby driving the adhesive layer 31 to change its viscosity. The above-mentioned form of disposing of the electrode layer on only one side is beneficial for the design of a thinner and lighter device.

[0051] For example, in some embodiments, reference Figure 2 The first electrode layer 32 includes a first main electrode portion 321 and a first connecting electrode portion 322. The first main electrode portion 321 is sandwiched between the adhesive layer 31 and the waveguide structure 10. The first connecting electrode portion 322 is connected to the first main electrode portion 321 and configured to connect to the control circuit 50. For example, one end of the first connecting electrode portion 322 is connected to the first main electrode portion 321, and the other end extends away from the first main electrode portion 321 to facilitate connection to the control circuit 50. The control circuit 50 can apply voltage to the first main electrode portion 321 through the first connecting electrode portion 322 as needed to drive the adhesive layer 31 to change its adhesion. For example, the control circuit 50 can be a flexible printed circuit board (FPC) or similar structure. The control circuit 50 can be located on the side of the device to avoid affecting the display effect.

[0052] For example, in some embodiments, the orthographic projection of the adhesive layer 31 onto the first main electrode portion 321 is located inside the first main electrode portion 321, that is, the setting range of the first main electrode portion 321 is larger than the setting range of the adhesive layer 31, so that the first main electrode portion 321 can fully apply voltage to the adhesive layer 31 to change the viscosity and avoid adverse conditions such as partial adhesion of the adhesive layer 31.

[0053] For example, in some embodiments, the waveguide structure 10 may further include a second cover layer 13 disposed on the side of the waveguide lens 11 away from the first cover layer 12. The second cover layer 13 is, for example, in the form of a cover plate, and its material is resin or glass, etc. The second cover layer 13 is connected to the waveguide lens 11 by an adhesive layer 15. An adhesive structure 30 is disposed between the functional lens 20 and the second cover layer 13, combining... Figure 2 and Figure 3 The second cover layer 13 includes a first surface 131 that is attached to the first main electrode portion 321 and a first side surface 132 adjacent to the first surface 131. The first connecting electrode portion 322 extends to the first side surface 132 to connect to the control circuit 50 from the first side surface 132. This side connection method can avoid affecting the display effect of the display image seen by the human eye.

[0054] For example, in some embodiments, such as Figure 2As shown, the second electrode layer 33 includes a second main electrode portion 331 and a second connecting electrode portion 332. The second main electrode portion 331 is sandwiched between the adhesive layer 31 and the functional lens 20. The second connecting electrode portion 332 is connected to the second main electrode portion 331 and configured to connect to a control circuit, such as the control circuit 50 described above or other control circuits. For example, one end of the second connecting electrode portion 332 is connected to the second main electrode portion 331, and the other end extends away from the second main electrode portion 331 to facilitate connection to the control circuit. The control circuit can apply voltage to the second main electrode portion 331 through the second connecting electrode portion 332 as needed to drive the adhesive layer 31 to change its viscosity.

[0055] For example, the orthographic projection of the adhesive layer 31 onto the second main electrode portion 331 is located inside the second main electrode portion 331. That is, the setting range of the second main electrode portion 331 is larger than the setting range of the adhesive layer 31, so that the second main electrode portion 331 can fully apply voltage to the adhesive layer 31 to change the viscosity and avoid undesirable situations such as partial adhesion of the adhesive layer 31.

[0056] For example, combining Figure 2 and Figure 3 The functional lens 20 includes a second surface 21 that is attached to the second main electrode portion 331 and a second side surface 22 adjacent to the second surface 21, with the second connecting electrode portion 332 extending to the second side surface 22. This side connection method can avoid affecting the display effect of the display image seen by the human eye.

[0057] For example, refer to Figure 2 The waveguide structure 10 includes an input region CL1 and an output region CL2. The functional lens 20 and the adhesive layer 31 are at least disposed in the output region CL2. At this time, the light emitted from the output region CL2 needs to be transmitted to the human eye through the adhesive structure 30 and the functional lens 20 so that the user can see the display screen.

[0058] For example, in Figure 2 Figure 3 In this embodiment, the adhesive layer 31 is planar, meaning that the adhesive layer 31 is at least entirely disposed in the coupling region CL2, and the area of ​​the adhesive layer 31 is greater than or equal to the area of ​​the coupling region CL2. In this case, the visible light transmittance of the adhesive structure 30 in the coupling region CL2 is greater than 70%, for example, greater than 90%, so that the human eye can see a clearer display image. For example, the shape and size of the adhesive layer 31 are consistent with those of the functional lens 20 to avoid structural gaps.

[0059] For example, in some embodiments, the second electrode layer 33 can be directly disposed on the functional lens 20, for example, by means of coating or coating, and the first electrode layer 32 can be directly disposed on the second cover layer 13, for example, by means of coating or coating, so that the overall structure of the device is less, which can achieve a thinner and lighter design, and the connection is more stable by direct disposal.

[0060] It should be noted that, in the embodiments of this disclosure, "directly set" of structure A on structure B means that there are no other structures or materials between structure A and structure B. For example, during the preparation process, structure A can be directly formed on structure B, or structure B can be directly formed on structure A.

[0061] For example, in some examples, the first electrode layer 32 and the second electrode layer 33 can be made of indium tin oxide (ITO). During the fabrication process, an indium tin oxide (ITO) layer can be directly formed on the functional lens 20 or the second cover layer 13 as a transparent conductive layer through a coating process. In other examples, the first electrode layer 32 and the second electrode layer 33 can also be made of silver nanowires. During the fabrication process, a transparent conductive layer of interconnected silver nanowires can be formed by coating with a silver nanowire layer to achieve conductivity. The materials of the first electrode layer 32 and the second electrode layer 33 can be the same or different.

[0062] For example, in some embodiments, the thickness of the first electrode layer 32 and the second electrode layer 33 can be 5nm-5000nm, such as 50nm, 100nm, 500nm, 1000nm, 2000nm, 3000nm, 4000nm, or 5000nm, and the sheet resistance of the first electrode layer 32 and the second electrode layer 33 can be less than 10000 ohms / sq. When the first electrode layer 32 or the second electrode layer 33 is indium tin oxide (ITO), the thickness of the ITO layer can be 5nm-3000nm, such as 50nm, 100nm, 500nm, 1000nm, 2000nm, or 3000nm, and the resistance is less than 10 ohms. When the first electrode layer 32 or the second electrode layer 33 is coated with silver nanowires, the thickness of the silver nanowire coating can be 0.05μm-10.0μm, such as 0.1μm, 0.5μm, 1.0μm, 3.0μm, 5.0μm, 7.0μm, 9.0μm, or 10.0μm, and the resistance is less than 10 ohms. For example, the thickness of the adhesive layer 31 can be 0.01mm-0.40mm, such as 0.05mm, 0.10mm, 0.20mm, 0.30mm, or 0.40mm.

[0063] For example, in the above embodiments, the functional lens 20 can be a plano-concave lens or a plano-convex lens, and can be configured with different prescriptions to meet different user needs. For example, refer to Figure 3 The second surface 21 of the functional lens 20, that is, the surface close to the waveguide structure 10, is a plane so that the adhesive layer 31 can be fully bonded to the second surface 21. In this case, the light carrying the display image needs to pass through the adhesive layer 31, the first electrode layer 32 and the second electrode layer 33. At this time, the adhesive layer 31, the first electrode layer 32 and the second electrode layer 33 are made of transparent materials with good light transmittance, which can improve the display effect of the display image seen by the human eye.

[0064] For example, in some embodiments, the overall visible light transmittance of the bonding structure 30 is greater than 70%, for example, greater than 90%, so that the human eye can see a clearer display image. For example, the haze of the bonding structure 30 is less than 5, for example, less than 2. Haze refers to the percentage of transmitted light intensity that deviates from the incident light angle by more than 2.5° from the total transmitted light intensity. Higher haze means a decrease in film gloss and transparency, especially image quality. The haze test method can adopt ASTM D1003, which is the D1003 test standard of the American Society for Testing and Materials. For example, the chromaticity of the bonding structure 30 is |a| < 3 and |b| < 5, for example, |a| < 0.5 and |b| < 1. Chromaticity is a property of color excluding brightness; it reflects the hue and saturation of a color. The chromaticity test method can adopt ASTM E308, which is the E308 test standard of the American Society for Testing and Materials.

[0065] For example, in some embodiments, the main chemical components of the adhesive layer 31 include one or a combination of several types such as polysiloxane, polyurethane, poly(meth)acrylate, epoxy, and rubber. Various additives, such as electroactivated particles and reactive ions, can be added according to different film properties to control the modification or reaction of these additives under the action of voltage, thereby changing the properties of the adhesive layer 31 and thus changing the adhesion of the adhesive layer 31.

[0066] For example, if the peel force of the adhesive layer 31 is >200gf / 25mm when no voltage is applied, such as >500gf / 25mm, the test method is ASTM D3330, which is the D3330 test standard of the American Society for Testing Materials.

[0067] For example, one of the first electrode layer 32 and the second electrode layer 33 is configured as a positive electrode to apply a positive voltage, and the other is configured as a negative electrode to apply a ground voltage or a negative voltage. In this case, the adhesive layer 31 can be configured to reduce viscosity at the positive electrode (i.e., the viscosity decreases on the side closer to the positive electrode when energized) or at the negative electrode (i.e., the viscosity decreases on the side closer to the negative electrode when energized). For example, the voltage difference applied to the positive and negative electrodes does not exceed 36V, for example, not exceeding 10V; the energizing time required for the adhesive layer 31 to decrease from 100% adhesive strength to 10% adhesive strength does not exceed 10 minutes, for example, not exceeding 1 minute. For example, when configuring the adhesive layer 31, the pressure and time can be adjusted by the concentration of electroactivated particles, reactive ions, etc. The higher the concentration of active particles such as electroactivated particles and reactive ions, or the higher the voltage applied to the adhesive layer 31, the less time is required for the viscosity of the adhesive layer 31 to decrease.

[0068] For example, Figure 4 A plan view of another near-eye display device provided in at least one embodiment of the present disclosure is shown. Figure 5 It shows Figure 4 The diagram shows a cross-sectional view of the near-eye display device along the BB line. In other embodiments, the waveguide structure 10 includes a coupling region CL1 and a coupling region CL2. A functional lens 20 is at least disposed in the coupling region CL2 to adjust the light emitted from the coupling region CL2, so that the user can see a clear display image. Unlike the above embodiments, the adhesive layer 31 is linear or annular, extending along the edge of the coupling region CL2 (e.g., along the outer side of the edge, such as in the frame region N), to avoid the coupling region CL2 and prevent the size of the coupling region CL2 from being reduced. For example, the first electrode layer 32 and the second electrode layer 33 are also linear or annular, extending along the edge of the coupling region CL2 (e.g., along the outer side of the edge, such as in the frame region N), to avoid the coupling region CL2 and control the adhesive layer 31.

[0069] For example, the bonding structure 30 as a whole at least partially surrounds the coupling region CL2 (e.g., the border region N) to form a seal, preventing impurities from entering the surface of the waveguide lens 11. In this case, the overall planar shape of the bonding structure 30 is either a non-closed annulus (in the case of partial surrounding) or a closed annulus (in the case of complete surrounding).

[0070] For example, the materials of the first electrode layer 32 and the second electrode layer 33 include metals or alloys, such as copper, aluminum, titanium, etc., to improve conductivity. For example, the thicknesses of the first electrode layer 32 and the second electrode layer 33 ( Figure 5The vertical dimension of the first electrode layer 32 is between 5nm and 5000nm, such as 50nm, 500nm, 1000nm, 2000nm, 3000nm, 4000nm, or 5000nm. The sheet resistance of the first electrode layer 32 and the second electrode layer 33 is <10000 ohm / sq. The materials and thicknesses of the first electrode layer 32 and the second electrode layer 33 can be the same or different.

[0071] For example, in some embodiments, such as Figure 4 As shown, the width W1 of the adhesive layer 31 (the dimension along the extension direction perpendicular to the adhesive layer 31) can be 0.1mm-5mm, for example, 0.1mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, or 5mm, etc. Figure 5 As shown, the thickness H1 of the adhesive layer 31 can be 0.01mm-0.40mm, such as 0.01mm, 0.05mm, 0.10mm, 0.20mm, 0.30mm or 0.40mm, etc.

[0072] For example, similar to the embodiments described above, refer to Figure 5 The first electrode layer 32 includes a first main electrode portion 321 and a first connecting electrode portion 322. The first main electrode portion 321 is sandwiched between the adhesive layer 31 and the waveguide structure 10, and the first connecting electrode portion 322 is connected to the first main electrode portion 321 and configured to connect to the control circuit 50. For example, one end of the first connecting electrode portion 322 is connected to the first main electrode portion 321, and the other end extends away from the first main electrode portion 321 to facilitate connection to the control circuit 50. The control circuit 50 can apply voltage to the first main electrode portion 321 through the first connecting electrode portion 322 as needed to drive the adhesive layer 31 to change its viscosity.

[0073] For example, the orthographic projection of the adhesive layer 31 onto the first main electrode portion 321 is located inside the first main electrode portion 321, that is, the setting range of the first main electrode portion 321 is larger than the setting range of the adhesive layer 31, so that the first main electrode portion 321 can fully apply voltage to the adhesive layer 31 to change the viscosity and avoid adverse conditions such as partial adhesion of the adhesive layer 31.

[0074] For example, in some embodiments, the waveguide structure 10 may further include a second cover layer 13 disposed on the side of the waveguide lens 11 away from the first cover layer 12, and the bonding structure 30 is disposed between the functional lens 20 and the second cover layer 13. Similarly, referring to... Figure 3 and Figure 5The second cover layer 13 includes a first surface 131 that is attached to the first main electrode portion 321 and a first side surface 132 adjacent to the first surface 131. The first connecting electrode portion 322 extends to the first side surface 132 to connect to the control circuit from the first side surface 132. This side connection method can avoid affecting the display effect of the display screen as seen by the human eye.

[0075] For example, in some embodiments, the second electrode layer 33 includes a second main electrode portion 331 and a second connecting electrode portion 332; the second main electrode portion 331 is sandwiched between the adhesive layer 31 and the functional lens 20, and the second connecting electrode portion 332 is connected to the second main electrode portion 331 and configured to connect a control circuit. For example, one end of the second connecting electrode portion 332 is connected to the second main electrode portion 331, and the other end extends away from the second main electrode portion 331 to facilitate connection to the control circuit. The control circuit can apply voltage to the second main electrode portion 331 through the second connecting electrode portion 332 as needed to drive the adhesive layer 31 to change its viscosity.

[0076] For example, the orthographic projection of the adhesive layer 31 onto the second main electrode portion 331 is located inside the second main electrode portion 331. That is, the setting range of the second main electrode portion 331 is larger than the setting range of the adhesive layer 31, so that the second main electrode portion 331 can fully apply voltage to the adhesive layer 31 to change the viscosity and avoid undesirable situations such as partial adhesion of the adhesive layer 31.

[0077] For example, refer to Figure 3 and Figure 5 The functional lens 20 includes a second surface 21 that is attached to the second main electrode portion 331 and a second side surface 22 adjacent to the second surface 21, with the second connecting electrode portion 332 extending to the second side surface 22. This side connection method can avoid affecting the display effect of the display image seen by the human eye.

[0078] For example, in some embodiments, the second electrode layer 33 can be directly disposed on the functional lens 20, for example, by coating, plating, or other surface treatment methods. The first electrode layer 32 can be directly disposed on the second cover layer 13, for example, by coating, plating, or other surface treatment methods. This results in a simpler overall device structure, enabling a thinner profile, and the direct placement method provides a more stable connection. Alternatively, in other embodiments, the second electrode layer 33 can be attached to the functional lens 20, and the first electrode layer 32 can also be attached to the second cover layer 13.

[0079] For example, for Figure 4 and Figure 5For the embodiments described above, the material and properties of the adhesive layer 31, as well as the driving characteristics of the first electrode layer 32 and the second electrode layer 33, which are not further described here, please refer to the above embodiments.

[0080] For example, Figure 6 A plan view of another near-eye display device provided in at least one embodiment of the present disclosure is shown. Figure 7 It shows Figure 6 The near-eye display device is shown in a cross-sectional schematic diagram along the CC line. In some other embodiments, the waveguide structure 10 includes an insertion region CL1 and an exit region CL2. The functional lens 20 is at least disposed in the exit region CL2. The waveguide structure 10 also includes a second cover layer 13 disposed on the side of the waveguide lens 11 away from the first cover layer 12. The second cover layer 13 is at least disposed in the insertion region CL1 and is hollowed out / avoided in the exit region CL2, that is, there is no material of the second cover layer 13 in the exit region CL2.

[0081] For example, the adhesive layer 31 may be linear or annular, extending along the edge of the coupling region CL2 (e.g., along the outer side of the edge, such as in the border region N) to avoid the coupling region CL2 and prevent reduction in the size of the coupling region CL2. Similarly, the first electrode layer 32 and the second electrode layer 33 may also be linear or annular, extending along the edge of the coupling region CL2 (e.g., along the outer side of the edge, such as in the border region N) to avoid the coupling region CL2 and control the adhesive layer 31.

[0082] For example, the bonding structure 30 may at least partially surround the coupling region CL2, such as completely surrounding it, to form a seal and prevent impurities from entering the surface of the waveguide lens 11. In this case, the overall planar shape of the bonding structure 30 may be a non-closed annulus (in the case of partial surrounding) or a closed annulus (in the case of complete surrounding).

[0083] Similarly, the first electrode layer 32 includes a first main electrode portion 321 and a first connecting electrode portion 322. The first main electrode portion 321 is sandwiched between the adhesive layer 31 and the waveguide structure 10, and the first connecting electrode portion 322 is connected to the first main electrode portion 321 and configured to connect to the control circuit 50. For example, the orthographic projection of the adhesive layer 31 onto the first main electrode portion 321 is located inside the first main electrode portion 321, that is, the setting range of the first main electrode portion 321 is larger than the setting range of the adhesive layer 31, so that the first main electrode portion 321 can fully apply voltage to the adhesive layer 31 to change the viscosity and avoid adverse conditions such as partial adhesion of the adhesive layer 31.

[0084] For example, refer to Figure 7The bonding structure 30 includes a first portion 30A sandwiched between the second cover layer 13 and the functional lens 20 and a second portion 30B sandwiched between the waveguide lens 11 and the functional lens 20. The waveguide lens 11 includes a third surface 111 that is attached to the second portion 30B and a third side surface 112 that is adjacent to the third surface. The first connecting electrode portion 322 extends to the third side surface 112.

[0085] For example, in some embodiments, the second electrode layer 33 includes a second main electrode portion 331 and a second connecting electrode portion 332; the second main electrode portion 331 is sandwiched between the adhesive layer 31 and the functional lens 20, and the second connecting electrode portion 332 is connected to the second main electrode portion 331 and configured to connect a control circuit. For example, the orthographic projection of the adhesive layer 31 onto the second main electrode portion 331 is located inside the second main electrode portion 331. That is, the setting range of the second main electrode portion 331 is larger than the setting range of the adhesive layer 31, so that the second main electrode portion 331 can fully apply voltage to the adhesive layer 31 to change the adhesion and avoid undesirable conditions such as partial adhesion of the adhesive layer 31.

[0086] For example, in some embodiments, the second electrode layer 33 can be directly disposed on the functional lens 20, for example, by means of coating or coating, and the first electrode layer 32 can be directly disposed on the second cover layer 13 or the waveguide lens 11, for example, by means of coating or coating, thus the overall structure of the device is less, it can be made thinner, and the connection is more stable by direct disposal.

[0087] For example, in some embodiments, such as Figure 7 As shown, the functional lens 20 includes a hollowed-out portion 20A, and a first portion 30A is disposed in the hollowed-out portion 20A. The hollowed-out portion 20A provides space for the placement of the first portion 30A, thereby reducing the overall thickness of the device and facilitating a thinner design. For example, during the manufacturing process, the functional lens 20 can be hollowed out / avoided using precision cutting. In this case, the shape of the hollowed-out portion 20A can be consistent with the shape of the overlapping area between the second cover layer 13 and the functional lens 20, which helps to improve the compactness of the structure.

[0088] For example, in some embodiments, such as Figure 7 As shown, the thickness H2 of the hollowed-out portion 20A is greater than the thickness H3 of the first portion 30A. At this time, in Figure 7 In this process, the lower surface of the functional lens 20 is lower than the upper surface of the second cover layer 13, and the functional lens 20 corresponding to the coupling region CL2 can have a larger thickness in order to accommodate various functional lenses 20.

[0089] Compared to Figure 4 and Figure 5 In the above embodiments, the functional lens 20 replaces at least a portion of the second cover layer 13 corresponding to the coupling region CL2, thereby achieving more extreme thinning and weight reduction, and realizing a lightweight design.

[0090] For example, in this embodiment, such as Figure 6 As shown, the width W1 of the adhesive layer 31 can be 0.1mm-5mm, for example, 0.1mm, 0.5mm, 1mm, 2mm, 3mm, 4mm or 5mm, etc. Figure 7 As shown, the thickness of the adhesive layer 31 is ( Figure 7 The vertical dimension is 0.003mm-0.4mm, for example, 0.005mm, 0.01mm, 0.05mm, 0.1mm, 0.2mm, 0.3mm, or 0.4mm. Since the first electrode layer 32 and the second electrode layer 33 are located at the edge of the device, such as the outer edge of the coupling structure CL2, or the frame region N, the first electrode layer 32 and the second electrode layer 33 can be made of metal or alloy, such as copper, aluminum, titanium, etc., to improve conductivity.

[0091] For example, if the peel force of the adhesive layer 31 is >200gf / 25mm when no voltage is applied, such as >1000gf / 25mm, the test method is ASTM D3330, which is the D3330 test standard of the American Society for Testing Materials.

[0092] For example, in some embodiments, the main chemical components of the adhesive layer 31 include one or a combination of several types such as polysiloxanes, polyurethanes, poly(meth)acrylates, epoxy, and rubber. Various additives, such as electroactivated particles and reactive ions, can be added according to different film properties to change the properties of the adhesive layer 31 under the action of voltage, thereby changing the viscosity.

[0093] For example, one of the first electrode layer 32 and the second electrode layer 33 is configured as a positive electrode to apply a positive voltage, and the other is configured as a negative electrode to apply a ground voltage or a negative voltage. In this case, the adhesive layer 31 can be configured to reduce viscosity at the positive electrode (i.e., the viscosity decreases on the side closer to the positive electrode when energized) or at the negative electrode (i.e., the viscosity decreases on the side closer to the negative electrode when energized). For example, the voltage difference applied to the positive and negative electrodes does not exceed 36V, for example, not exceeding 10V; the energizing time required for the adhesive layer 31 to decrease from 100% adhesive strength to 10% adhesive strength does not exceed 10 minutes, for example, not exceeding 1 minute. For example, when configuring the adhesive layer 31, the pressure and time can be adjusted by the concentration of electroactivated particles, reactive ions, etc. The higher the concentration of active particles such as electroactivated particles and reactive ions, or the higher the voltage applied to the adhesive layer 31, the less time is required for the viscosity of the adhesive layer 31 to decrease.

[0094] For example, for Figure 6 and Figure 7 For the embodiments described above, the structures and corresponding technical effects of the adhesive layer 31, the first electrode layer 32, and the second electrode layer 33, which are not described in detail here, can be referred to the various embodiments.

[0095] For example, in some other embodiments, Figure 8 A plan view of another near-eye display device provided in at least one embodiment of the present disclosure is shown. Figure 9 for Figure 8 A schematic cross-sectional view of the near-eye display device along the DD line. In this embodiment, the adhesive layer 31, the first electrode layer 32, and the second electrode layer 33 are also disposed across the entire surface, and... Figure 3 The implementation is different in that, Figure 8 In this embodiment, the second cover layer 13 is only disposed in the coupling region CL1 and its surrounding region CL10, and the adhesive layer 31, the first electrode layer 32 and the second electrode layer 33 are disposed on the entire surface of the coupling region CL2 and its surrounding region CL20. The frame region N includes the surrounding regions CL10 and CL20. At this time, the second electrode layer 33 can be directly disposed on the waveguide lens 11, and the first electrode layer 32 can be directly disposed on the functional lens 20, thereby reducing the overall thickness of the device and achieving a lightweight design.

[0096] For example, for Figure 8 and Figure 9 For embodiments where no further details are provided regarding the structure, materials, connection relationships, and corresponding technical effects of the adhesive layer 31, the first electrode layer 32, and the second electrode layer 33, please refer to [the relevant documentation]. Figure 2 The specific implementation examples are not described here.

[0097] For example, in some other embodiments, Figure 10 It shows Figure 2 Another cross-sectional schematic diagram of the near-eye display device along line AA, in which the form of the bonding structure 30 differs from that in the above embodiments, for example, in Figure 10 In one embodiment, the electrode layer includes a substrate and an electrode pattern disposed on the substrate, the substrate being connected to the functional lens 20 or the waveguide structure 10 by an adhesive.

[0098] For example, such as Figure 10 As shown, the electrode layer includes a first electrode layer 32 disposed on the side of the adhesive layer 31 near the waveguide structure 10 and a second electrode layer 33 disposed on the side of the adhesive layer 31 near the functional lens 20. The first electrode layer 32 includes a first substrate 32A and a first electrode pattern 32B disposed on the substrate 32A. The first electrode pattern 32B is bonded to the adhesive layer 31, and the first substrate 32A is connected to the waveguide structure 10 by a first adhesive 32C. The second electrode layer 33 includes a second substrate 33A and a second electrode pattern 33B disposed on the substrate 33A. The second electrode pattern 33B is bonded to the adhesive layer 31, and the second substrate 33A is connected to the functional lens 20 by a second adhesive 33C.

[0099] In this embodiment, the bonding structure 30 can be an independent structure that can be used and replaced separately. For example, Figure 11 A cross-sectional schematic diagram of the bonding structure 30 is shown, as follows. Figure 11 As shown, in addition to the first substrate 32A, the first electrode pattern 32B, and the first adhesive 32C, the first electrode layer 32 also includes a first release layer 32D. In use, the first release layer 32D is peeled off, exposing the first adhesive 32C for bonding to the waveguide structure 10, for example, to the second cover layer 13. In addition to the second substrate 33A, the second electrode pattern 33B, and the second adhesive 33C, the second electrode layer 33 also includes a second release layer 33D. In use, the second release layer 33D is peeled off, exposing the second adhesive 33C for bonding to the functional lens 20.

[0100] In this embodiment, it is not necessary to form an electrode layer on the waveguide structure 10 and the functional lens 20. During the fabrication process, the waveguide structure 10, the functional lens 20 and the bonding structure 30 can be formed respectively, and then the waveguide structure 10 and the functional lens 20 can be assembled through the bonding structure 30.

[0101] For example, in Figure 10In this embodiment, the bonding structure 30 is disposed over the entire surface of the coupling region CL2 and its surrounding area. For example, the bonding layer 31 has the same shape and size as the functional lens 20 to avoid structural gaps. At this time, the first electrode pattern 32B and the second electrode pattern 33B are also planar. The visible light transmittance of the bonding structure 30 in the coupling region CL2 is greater than 70%, for example, greater than 90%, so that the human eye can see a clearer display image.

[0102] For example, the thickness of the first release layer 32D and the second release layer 33D (in Figure 11 The vertical dimension can be 5μm-200μm, for example 20μm-80μm, such as 20μm, 30μm, 40μm, 50μm, 60μm, 70μm or 80μm, to facilitate peeling. The first adhesive 32C and the second adhesive 33C can be transparent films, such as pressure-sensitive or post-curing transparent adhesives (the peel strength, optical properties and other physical properties of the adhesive are basically the same as those of the adhesive layer 31, and can be referred to the above embodiments for details), used to fix the substrate to the functional lens 20 or the waveguide structure 10; the first substrate 32A and the second substrate 33A are transparent substrates used to support and protect the electrode patterns on them, improving the versatility of the application.

[0103] For example, in some examples, the materials that the first substrate 32A and the second substrate 33A can be made of include transparent substrates such as polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polyurethane (PU), polyethylene (PE), cellulose triacetate (TAC), polyethylene naphthalate (PEN), cyclic olefin copolymer (COC), cyclic olefin polymer (COP), polyimide (PI), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), and polyolefin (PO). During the preparation process, their surfaces can be coated or electroplated / evaporated with electrode patterns, such as poly(3,4-ethylenedioxythiophene) (PEDOT), poly(3,4-ethylenedioxythiophene) / polystyrene sulfonate (PEDOT / PSS), indium tin oxide (ITO), etc.; the thickness of the adhesive layer 31 can be 3μm-400μm, for example 20μm-200μm, such as 20μm, 50μm, 100μm, 150μm, or 200μm, etc.

[0104] For example, for Figure 10 For the embodiments described above, the structure, connection relationship and corresponding technical effects of the adhesive layer 31, the first electrode layer 32 and the second electrode layer 33, etc., which are not described in detail here, please refer to the above embodiments.

[0105] For example, Figure 12 A cross-sectional schematic diagram of another near-eye display device provided in an embodiment of this disclosure is shown, and its plan view can be referenced. Figure 5 , Figure 12 Implementation examples and Figure 11 The difference in the embodiments is that the adhesive layer 31 is in the form of a line or ring extending along the edge of the coupling region CL2 (e.g., along the outer side of the edge, such as the border region N) to avoid the coupling region CL2 and prevent the size of the coupling region CL2 from being reduced. For example, the first electrode layer 32 and the second electrode layer 33 are also in the form of a line or ring extending along the edge of the coupling region CL2 (e.g., along the outer side of the edge, such as the border region N) to avoid the coupling region CL2 and control the adhesive layer 31.

[0106] For example, the bonding structure 30 may at least partially surround the coupling region CL2, such as completely surrounding it, to form a seal and prevent impurities from entering the surface of the waveguide lens 11. In this case, the overall planar shape of the bonding structure 30 may be a non-closed annulus (in the case of partial surrounding) or a closed annulus (in the case of complete surrounding).

[0107] Since the bonding structure 30 is set along the edge, there is no longer a requirement for the light transmittance of the bonding structure 30. At this time, the materials that the first substrate 32A and the second substrate 33A can be are various substrates such as PET, PP, PC, PU, ​​PE, TAC, PEN, COC, COP, PI, PMMA, PVC, PO, paper, and non-woven fabric. The electrode pattern on its surface can be conductive materials such as PEDOT, PEDOT / PSS, ITO, graphite, graphene, metals, and alloys, such as metals or alloys such as Cu, Al, Au, and Ni.

[0108] For example, for Figure 12 For the embodiments described above, the structure, connection relationship and corresponding technical effects of the adhesive layer 31, the first electrode layer 32 and the second electrode layer 33, etc., which are not described in detail here, please refer to the above embodiments.

[0109] In summary, in the embodiments of this disclosure, the functional lens and the waveguide structure are connected by a viscosity-adjustable adhesive structure, thereby forming a repairable optical waveguide display optical module with adjustable diopter, such as an AR module. The adhesive structure includes an adhesive layer and an electrode layer. By applying voltage to the adhesive layer through the electrode layer, the adhesive layer can be controlled to change its viscosity, ultimately realizing the disassembly of the functional lens and the waveguide structure, enabling the replacement and repair of the functional lens, improving the convenience and flexibility of the device, and reducing costs.

[0110] The following points also need to be explained:

[0111] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.

[0112] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the present disclosure, i.e., these drawings are not drawn to actual scale. It will be understood that when an element such as a layer, film, region or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element or there may be intermediate elements.

[0113] (3) Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0114] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. The scope of protection of this disclosure shall be determined by the scope of the claims.

Claims

1. A near-eye display device, comprising: The waveguide structure includes stacked waveguide mirrors and a first cladding layer. A functional lens is disposed on the side of the waveguide lens away from the first cover layer, and An adhesive structure, disposed between the functional lens and the waveguide structure, includes an adhesive layer and an electrode layer located on at least one side of the adhesive layer, the adhesive layer being configured to change its viscosity under the control of the electrode layer.

2. The near-eye display device according to claim 1, wherein, The electrode layer includes a first electrode layer disposed on the adhesive layer near the waveguide structure and a second electrode layer disposed on the adhesive layer near the functional lens. The first electrode layer and the second electrode layer are configured to apply a voltage to the adhesive layer to control the adhesive layer to change its viscosity.

3. The near-eye display device according to claim 2, wherein, The first electrode layer includes: The first main electrode portion is sandwiched between the adhesive layer and the waveguide structure, and The first connecting electrode part is connected to the first main electrode part and is configured to connect to the control circuit.

4. The near-eye display device according to claim 3, wherein, The orthographic projection of the adhesive layer onto the first main electrode portion is located inside the first main electrode portion.

5. The near-eye display device according to claim 3 or 4, wherein, The waveguide structure further includes a second cover layer disposed on the side of the waveguide lens away from the first cover layer, and the bonding structure is disposed between the functional lens and the second cover layer. The second cover layer includes a first surface that is in contact with the first main electrode portion and a first side surface adjacent to the first surface, wherein the first connecting electrode portion extends to the first side surface.

6. The near-eye display device according to claim 3 or 4, wherein, The second electrode layer includes: The second main electrode portion is sandwiched between the adhesive layer and the functional lens, and The second connecting electrode part is connected to the second main electrode part and is configured to connect to the control circuit. The orthographic projection of the adhesive layer onto the second main electrode portion is located inside the second main electrode portion.

7. The near-eye display device according to claim 6, wherein, The functional lens includes a second surface that is in contact with the second main electrode portion and a second side surface adjacent to the second surface, wherein the second connecting electrode portion extends to the second side surface.

8. The near-eye display device according to claim 5, wherein, The waveguide structure includes an insertion region and an exit region, and the functional lens and the adhesive layer are disposed at least in the exit region. The adhesive layer is planar, and the visible light transmittance of the adhesive structure in the coupling region is greater than 70%.

9. The near-eye display device according to claim 5, wherein, The waveguide structure includes an input region and an output region, and the functional lens is disposed at least in the output region. The adhesive layer is in the form of a line or ring extending along the edge of the coupling region. The materials of the first electrode layer and the second electrode layer include metals or alloys.

10. The near-eye display device according to claim 3 or 4, wherein, The waveguide structure includes an input region and an output region, and the functional lens is disposed at least in the output region. The waveguide structure further includes a second cover layer disposed on the side of the waveguide lens away from the first cover layer, the second cover layer being disposed at least in the coupling region and hollowed out in the coupling region. The bonding structure includes a first portion sandwiched between the second cover layer and the functional lens, and a second portion sandwiched between the waveguide lens and the functional lens.

11. The near-eye display device according to claim 10, wherein, The functional lens includes a hollow portion, and the first part is disposed in the hollow portion.

12. The near-eye display device according to claim 10, wherein, The waveguide lens includes a third surface that is attached to the second portion and a third side surface adjacent to the third surface, wherein the first connecting electrode portion extends to the third side surface.

13. The near-eye display device according to any one of claims 2-4, wherein, The second electrode layer is directly disposed on the functional lens. The waveguide structure further includes a second cover layer disposed on the side of the waveguide lens away from the first cover layer, and the first electrode layer is directly disposed on the second cover layer or the waveguide lens.

14. The near-eye display device according to any one of claims 1-4, wherein, The electrode layer includes a substrate and an electrode pattern disposed on the substrate. The substrate is attached to the functional lens or the waveguide structure by an adhesive.

15. The near-eye display device according to any one of claims 1-4, wherein, When the electrode layer is not energized, the adhesive layer has a first adhesive property. When the electrode layer is energized to apply a voltage to the adhesive layer, the adhesive layer has a second adhesiveness, which is greater than the first adhesiveness.

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