Preparation method for polarization volume holographic device, and polarization volume holographic device

Abstract

A preparation method for a polarization volume holographic device, the method comprising: providing an alignment layer on a first surface of a substrate layer; providing a liquid crystal layer on the surface of the side of the alignment layer facing away from the substrate layer, so as to obtain an intermediate body; and connecting a connecting curved surface of a device layer to the liquid crystal layer of the intermediate body to obtain a polarization volume holographic device.

Description

Fabrication method of polarization body holographic device and polarization body holographic device

[0001] This application claims priority to Chinese Patent Application No. 2024119966652, filed with the Chinese Patent Office on December 31, 2024, entitled "Preparation Method of Polarizing Holographic Device and Polarizing Holographic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical device technology, and in particular to a method for fabricating a polarizing body holographic device and the polarizing body holographic device itself. Background Technology

[0003] Polarizing holographic devices are a new type of optical device that has emerged in recent years. Examples include polarizing holographic gratings and polarizing holographic lenses. Polarizing holographic devices have significant advantages such as high diffraction efficiency and wide wavelength and angular bandwidth.

[0004] However, in related technologies, polarization holographic devices are typically fabricated on a planar substrate, resulting in planar polarization holographic devices. This is not conducive to the integration of polarization holographic devices with curved refractive or reflective optical devices. When a planar polarization holographic device is combined with curved optical devices, such as curved refractive or reflective optical devices, to form an optical system, the planar polarization holographic device cannot be fitted to the curved surface of the curved optical device in the optical system, which is not conducive to reducing the size of the optical system. Summary of the Invention

[0005] The main objective of this application is to provide a method for fabricating a polarizing holographic device and a polarizing holographic device, aiming to solve the technical problem that when a planar polarizing holographic device is combined with a curved optical device to form an optical system, the planar polarizing holographic device cannot be fitted to the curved surface of the curved optical device in the optical system, resulting in a large size of the optical system.

[0006] In a first aspect, embodiments of this application provide a method for fabricating a polarizing holographic device, comprising:

[0007] An orientation layer is disposed on the first surface of the substrate layer;

[0008] A liquid crystal layer is disposed on the surface of the alignment layer opposite to the substrate layer to obtain an intermediate;

[0009] A connecting surface of the device layer is connected to the liquid crystal layer of the intermediate to obtain a polarizing holographic device; wherein, the connecting surface is used to make the surface curvature of the substrate layer in the polarizing holographic device different from the surface curvature of the substrate layer in the intermediate, the surface curvature of the alignment layer in the polarizing holographic device different from the surface curvature of the alignment layer in the intermediate, and the surface curvature of the liquid crystal layer in the polarizing holographic device different from the surface curvature of the liquid crystal layer in the intermediate.

[0010] Secondly, embodiments of this application also provide a polarizing holographic device, comprising:

[0011] basal layer;

[0012] An orientation layer is disposed on a first surface of the substrate layer;

[0013] A liquid crystal layer, the liquid crystal layer being disposed on the surface of the alignment layer opposite to the substrate layer; and

[0014] A device layer, wherein a connecting surface of the device layer is connected to the liquid crystal layer; the connecting surface is used to make the surface curvature of the substrate layer in the polarizer holographic device different from the surface curvature of the substrate layer before the liquid crystal layer is connected to the connecting surface, the surface curvature of the alignment layer in the polarizer holographic device different from the surface curvature of the alignment layer before the liquid crystal layer is connected to the connecting surface, and the surface curvature of the liquid crystal layer in the polarizer holographic device different from the surface curvature of the liquid crystal layer before the liquid crystal layer is connected to the connecting surface.

[0015] Thirdly, embodiments of this application also provide a polarizing holographic device, the polarizing holographic device comprising at least:

[0016] Liquid crystal layer; and

[0017] A device layer, wherein the connecting surface of the device layer is connected to the liquid crystal layer; the surface curvature of the liquid crystal layer in the polarizer holographic device is different from the surface curvature of the liquid crystal layer before the liquid crystal layer is connected to the connecting surface.

[0018] The polarizing holographic device is obtained by peeling off at least one of the substrate layer and orientation layer included in the polarizing holographic device provided in the embodiments of this application.

[0019] This application provides a method for fabricating a polarizing holographic device and the polarizing holographic device itself. The method for fabricating the polarizing holographic device includes: setting an alignment layer on a first surface of a substrate layer; setting a liquid crystal layer on a surface of the alignment layer opposite to the substrate layer to obtain an intermediate; and connecting a connecting surface of a device layer to the liquid crystal layer of the intermediate to obtain the polarizing holographic device. The connecting surface is used to make the surface curvature of the substrate layer in the polarizing holographic device different from that of the substrate layer in the intermediate, the surface curvature of the alignment layer in the polarizing holographic device different from that of the alignment layer in the intermediate, and the surface curvature of the liquid crystal layer in the polarizing holographic device different from that of the liquid crystal layer in the intermediate.

[0020] Under the influence of the connecting surface, the surface curvature of the substrate layer, alignment layer, and liquid crystal layer in the intermediate body all changes, i.e., it changes according to the curvature of the connecting surface. This is equivalent to the polarizing holographic device being fabricated on a curved substrate. Accordingly, the polarizing holographic device fabricated on the curved substrate can be a polarizing holographic device with a curved shape. Based on this, by fabricating a polarizing holographic device with a curved shape, the substrate layer, alignment layer, and liquid crystal layer under the curved shape are bonded to the device layer with the connecting surface, which is equivalent to achieving the bonding of the curved substrate and the curved optical device, thereby forming a corresponding optical system. Compared to an optical system composed of a planar polarizing holographic device and a curved optical device, such as an optical system composed of a planar substrate and a curved optical device, the polarizing holographic device with a curved shape is advantageous for achieving a smaller optical system volume. Furthermore, since the curved substrate of the polarizing body holographic device can provide optical power or optical modulation capability to the polarizing body holographic device, it is beneficial to improve the optical modulation performance of the polarizing body holographic device. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 is a schematic flowchart of a method for fabricating a polarizing holographic device according to an embodiment of this application;

[0023] Figure 2 is a flowchart illustrating the fabrication process of a polarizing holographic device according to an embodiment of this application;

[0024] Figure 3 is a schematic diagram of a polarizer holographic device provided in an embodiment of this application;

[0025] Figure 4 is a schematic diagram of another polarizer holographic device provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures: 100, polarizing holographic device; 110, substrate layer; 120, alignment layer; 130, liquid crystal layer; 140, device layer. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0029] This application provides a method for fabricating a polarizing holographic device 100 and the polarizing holographic device 100 itself.

[0030] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] Please refer to Figure 1, which is a schematic flowchart of a method for fabricating a polarizer holographic device 100 according to an embodiment of this application. The polarizer holographic device 100 includes a polarizer holographic grating, a polarizer holographic lens, etc.

[0032] As shown in Figure 1, the fabrication method of the polarizer holographic device 100 includes steps S101 to S103.

[0033] S101. An orientation layer 120 is provided on the first surface of the base layer 110.

[0034] As shown in Figure 2(a), the substrate layer 110 can be obtained, and an orientation layer 120 can be disposed on the first surface of the substrate layer 110.

[0035] Correspondingly, the substrate layer 110 can serve as a support structure for the polarizer holographic device 100, providing mechanical stability and flatness for the polarizer holographic device 100, thereby improving the ease of fabrication of the polarizer holographic device 100.

[0036] For example, the base layer 110 is a flexible base layer.

[0037] For example, a flexible substrate is made from a flexible material. A flexible substrate has the property of bending without breaking.

[0038] In some embodiments, the first surface of the flexible substrate layer may serve as the first surface of the substrate layer 110. An alignment layer 120 is disposed on the first surface of the flexible substrate layer. For example, the alignment layer 120 is coated on the first surface of the flexible substrate layer.

[0039] For example, the base layer 110 includes a flexible base layer and a rigid base layer.

[0040] For example, the rigid substrate layer is made of a rigid material. Since the rigid substrate layer does not have bending properties, the rigid substrate layer 110 can be used as a support structure for the polarizer holographic device 100 during the fabrication process.

[0041] In some embodiments, the first surface of the flexible substrate can serve as the first surface of the substrate 110 for setting the alignment layer 120. The surface of the rigid substrate facing away from the flexible substrate can serve as the second surface of the substrate 110 for placement on the fabrication platform of the polarizer holographic device 100.

[0042] In some implementations, the flexible substrate layer is connected to the rigid substrate layer via a substrate adhesive layer.

[0043] For example, the substrate adhesive layer is prepared based on an adhesive material. One side surface of the substrate adhesive layer can be bonded to the surface of the flexible substrate layer near the rigid substrate layer, and the other side surface of the substrate adhesive layer can be bonded to the surface of the rigid substrate layer near the flexible substrate layer, so as to connect the flexible substrate layer and the rigid substrate layer to form the substrate layer 110 required for fabricating the polarizer holographic device 100.

[0044] Accordingly, when the substrate 110 includes a flexible substrate, the surface of the flexible substrate facing away from the rigid substrate can be defined as the first surface of the substrate 110. For example, the polarizer holographic device 100 can be fabricated based on the first surface of the flexible substrate.

[0045] For example, when an alignment layer 120 is provided on the first surface of the substrate layer 110, the orientation of the alignment layer 120 can be used to subsequently determine the orientation of the liquid crystal layer 130 in the polarizer holographic device 100.

[0046] In some embodiments, an alignment layer 120 is coated on a first surface of the substrate layer 110, and the alignment layer 120 is subjected to polarization exposure to form the alignment of the alignment layer 120.

[0047] For example, the alignment layer 120 can be coated onto the first surface of the substrate layer 110 using spin coating. Of course, it is not limited to spin coating and is not restricted here.

[0048] When an alignment layer 120 is coated on the first surface of the substrate layer 110, the orientation of the alignment layer 120 can be determined. As shown in FIG2(b), the alignment layer 120 can be polarized by exposure to form the orientation of the alignment layer 120. The orientation of the alignment layer 120 can be used for the subsequent orientation of the liquid crystal layer 130 included in the polarizer holographic device 100.

[0049] For example, the alignment layer 120 can be polarized exposed using a preset light source. The preset light source includes, for example, an ultraviolet light source, a laser light source, or other specific light sources, and is not limited here. When the alignment layer 120 is polarized exposed, the molecules involved in the alignment layer 120 can be ordered accordingly, resulting in a specific orientation on the alignment layer 120. The orientation of the alignment layer 120 can then be used to induce the orientation of the liquid crystal layer 130.

[0050] In some embodiments, the orientation layer 120 is formed by either interference exposure or polarization mask exposure.

[0051] For example, when interferometric exposure is performed on the alignment layer 120, the formation of a polarization interference pattern can be controlled by interfering two or more coherent beams on the upper surface of the alignment layer 120, thereby inducing the molecules of the alignment layer 120 to form a corresponding arrangement, thus establishing the orientation of the alignment layer 120. For instance, when interferometric exposure is performed on the alignment layer 120 using a preset light source, a polarizer can be used to control the polarization state of the light supplied to the alignment layer 120 by the preset light source. The polarizer can include polarizers, circular polarizers, etc., and is not limited thereto.

[0052] For example, when polarizing the alignment layer 120, selective exposure can be performed using a polarizing mask and a preset light source with a specific polarization state. The polarizing mask modulates the polarization distribution of the preset light source with a specific polarization state. For instance, if the preset light source is linearly polarized, the polarizing mask can modulate it from linear polarization to the desired polarization distribution, without limitation. Accordingly, polarization exposure of the alignment layer 120 can be achieved using a polarizing mask and a preset light source with the desired polarization distribution. The polarizing mask can also have the characteristic of being transparent in some areas and opaque in others. Based on the modulation effect of the polarizing mask on the polarization distribution of the preset light source and the regional transparency characteristics of the polarizing mask, a portion of the alignment layer 120 can be irradiated by the polarized light corresponding to the light provided by the preset light source after passing through the polarizing mask, thereby inducing the molecules involved in the alignment layer 120 in that portion of the region to align in a corresponding manner, forming the orientation of the alignment layer 120. Accordingly, this portion of the region can be referred to as the exposure region of the alignment layer 120. For example, a preset pattern can be designed on the polarization mask, and the exposure area of ​​the alignment layer 120 can be determined according to the preset pattern of the polarization mask, without any restrictions.

[0053] By performing polarization exposure on the alignment layer 120, such as interference exposure or polarization mask exposure, the alignment layer 120 can be oriented accordingly. The orientation of the alignment layer 120 can be used to induce the orientation of the liquid crystal layer 130, which can then be used to fabricate polarizing holographic devices 100, such as polarizing holographic gratings, polarizing holographic lenses, and other devices.

[0054] S102. A liquid crystal layer 130 is disposed on the surface of the alignment layer 120 opposite to the substrate layer 110 to obtain an intermediate.

[0055] As shown in Figure 2(c), when a liquid crystal layer 130 is disposed on the surface of the alignment layer 120 opposite to the substrate layer 110 to obtain an intermediate, the alignment layer 120 of the intermediate can provide an ordered orientation with a specific sorting direction to the liquid crystal layer 130 of the intermediate. Accordingly, the liquid crystal monomers included in the liquid crystal layer 130 of the intermediate can be arranged in the corresponding direction under the guidance of the alignment layer 120 of the intermediate.

[0056] In some embodiments, a liquid crystal layer 130 is coated on the surface of the alignment layer 120 opposite to the substrate layer 110 to align the liquid crystal layer 130 through the alignment layer 120; the liquid crystal layer 130 is then cured to obtain an intermediate.

[0057] For example, the liquid crystal layer 130 may comprise a liquid crystal solution formed by mixing a liquid crystal material with other additives, such as a photoinitiator. For instance, the liquid crystal solution may be coated onto the surface of the alignment layer 120 opposite to the substrate layer 110 by coating techniques such as spin coating, spray coating, or drop coating, thereby coating the liquid crystal layer 130 onto the surface of the alignment layer 120 opposite to the substrate layer 110, without limitation.

[0058] When the liquid crystal layer 130 is coated, the liquid crystal layer 130 can be cured to obtain an intermediate.

[0059] In some embodiments, a preset exposure light source can be used to cure the liquid crystal layer 130.

[0060] For example, the wavelength of the light provided by the preset exposure light source to the liquid crystal layer 130 is matched with the photosensitivity of the material included in the liquid crystal layer 130. Under the action of the preset exposure light source, the light provided by the preset exposure light source reacts with the photosensitive components of the material included in the liquid crystal layer 130, thereby causing the liquid crystal layer 130 to solidify.

[0061] When the liquid crystal layer 130 is cured to obtain an intermediate, the intermediate liquid crystal layer 130 is in a highly elastic state or a non-rigid state with a certain degree of elasticity. For example, when the liquid crystal layer 130 is cured using a preset exposure light source, the exposure parameters and exposure time of the preset exposure light source on the liquid crystal layer 130 can be limited to make the intermediate liquid crystal layer 130 in a highly elastic state or a non-rigid state with a certain degree of elasticity; however, no restrictions are imposed here. Based on the highly elastic or non-rigid characteristics of the intermediate liquid crystal layer 130, the surface curvature of the intermediate liquid crystal layer 130 can be changed during the subsequent fabrication of the polarizer holographic device 100, which helps to improve the fabrication flexibility of the polarizer holographic device 100.

[0062] For example, the liquid crystal layer 130 includes liquid crystal monomers.

[0063] In some embodiments, the liquid crystal monomer is cured to form a liquid crystal polymer. Accordingly, the intermediate includes the liquid crystal polymer.

[0064] For example, when the liquid crystal layer 130 is cured, the liquid crystal monomers included in the liquid crystal layer 130 can undergo polymerization reactions under the influence of factors such as temperature, pressure, and light to form polymer chains with liquid crystal optical properties, i.e., liquid crystal polymers. Accordingly, when liquid crystal polymers are formed, the orientation of the liquid crystal layer 130 can be fixed by the polymer network corresponding to the liquid crystal polymer. The liquid crystal polymer is in a highly elastic state or a non-rigid state with a certain degree of elasticity. Based on the highly elastic or non-rigid state characteristics of the liquid crystal polymer, when subsequently fabricating the polarizer holographic device 100, the surface curvature of the liquid crystal polymer included in the liquid crystal layer 130 can be changed to alter the surface curvature of the liquid crystal layer 130, which improves the fabrication flexibility of the polarizer holographic device 100.

[0065] S103. Connect the connecting surface of the device layer 140 to the liquid crystal layer 130 of the intermediate to obtain the polarizing holographic device 100; wherein, the connecting surface is used to make the surface curvature of the substrate layer 110 in the polarizing holographic device 100 different from the surface curvature of the substrate layer 110 in the intermediate, the surface curvature of the alignment layer 120 in the polarizing holographic device 100 different from the surface curvature of the substrate layer 110 in the intermediate, and the surface curvature of the liquid crystal layer 130 in the polarizing holographic device 100 different from the surface curvature of the liquid crystal layer 130 in the intermediate.

[0066] For example, device layer 140 may include gratings, lenses, etc., without limitation. When the connecting surface of device layer 140 is connected to the liquid crystal layer 130 of the intermediate, the connecting surface of device layer 140 can be used to change the surface curvature of substrate layer 110, alignment layer 120 and liquid crystal layer 130, so that the surface curvature of substrate layer 110 in polarizer holographic device 100 is different from that of substrate layer 110 in intermediate, the surface curvature of alignment layer 120 in polarizer holographic device 100 is different from that of substrate layer 110 in intermediate, and the surface curvature of liquid crystal layer 130 in polarizer holographic device 100 is different from that of liquid crystal layer 130 in intermediate.

[0067] For example, as shown in Figures 2(d) and 2(e), when the connecting curved surface of the liquid crystal layer 130 is connected to the liquid crystal layer 130 of the intermediate body, the surface curvature of the substrate layer 110 can be changed from the plane corresponding to the intermediate body to the curved surface corresponding to the polarizer holographic device 100, the surface curvature of the alignment layer 120 can be changed from the plane corresponding to the intermediate body to the curved surface corresponding to the polarizer holographic device 100, and the surface curvature of the liquid crystal layer 130 can be changed from the plane corresponding to the intermediate body to the curved surface corresponding to the polarizer holographic device 100, based on the surface curvature of the connecting curved surface. Accordingly, when the surface curvatures of the substrate layer 110, alignment layer 120, and liquid crystal layer 130 are changed according to the connecting curved surface of the device layer 140, the substrate layer 110, alignment layer 120, and liquid crystal layer 130 in a curved shape can serve as the curved substrate of the polarizer holographic device 100. When the polarizer holographic device 100 is fabricated on a curved substrate, the polarizer holographic device 100 can be a polarizer holographic device 100 in a curved shape. Based on this, the polarizer holographic device 100 can be fabricated not only on planar substrates but also on curved substrates, which improves the fabrication flexibility of the polarizer holographic device 100. When the surface curvature of the substrate layer 110, alignment layer 120, and liquid crystal layer 130 of the polarizer holographic device 100 is changed according to the connection surface of the device layer 140, the volume of the encapsulated polarizer holographic device 100 is reduced relative to the total volume required for the encapsulated device layer 140 plus the intermediate body fabricated on the planar substrate. This is beneficial for reducing the volume of the optical system containing the polarizer holographic device 100, such as a polarizer holographic grating or lens.

[0068] In some embodiments, when the substrate 110 includes a flexible substrate and a rigid substrate, the rigid substrate is removed before connecting the connection surface of the device layer 140 to the liquid crystal layer 130 of the intermediate.

[0069] For example, since the rigid substrate layer lacks bending properties and is located below the flexible substrate layer, alignment layer 120, liquid crystal layer 130, and device layer 140, the presence of the rigid substrate layer hinders the change of the surface curvature of the flexible substrate layer, alignment layer 120, and liquid crystal layer 130 of the intermediate substrate layer 110 according to the curvature of the connection surface of the device layer 140 when connecting the connection surface of the device layer 140 to the liquid crystal layer 130 of the intermediate substrate layer 110. Therefore, it is necessary to remove the rigid substrate layer included in the substrate layer 110 to improve the ease of changing the surface curvature of the intermediate substrate layer 110, alignment layer 120, and liquid crystal layer 130. Correspondingly, when the flexible substrate layer included in the substrate layer 110 is connected to the rigid substrate layer via a substrate adhesive layer, since the flexible substrate layer no longer needs to be connected to the rigid substrate layer, both the substrate adhesive layer and the rigid substrate layer can be removed.

[0070] For example, if the adhesive force between the alignment layer 120 and the flexible substrate layer included in the substrate layer 110 is greater than the adhesive force between the flexible substrate layer and the substrate adhesive layer, the substrate adhesive layer and the rigid substrate layer are peeled off. As another example, if the adhesive force between the flexible substrate layer and the substrate adhesive layer is greater than the adhesive force between the substrate adhesive layer and the rigid substrate layer, the rigid substrate layer is peeled off. However, this is not a limitation; for example, the separation of the flexible substrate layer and the rigid substrate layer can be achieved by dissolving the substrate adhesive layer. The dissolving solution used in dissolving the substrate adhesive layer should not dissolve other layers besides the substrate adhesive layer and should not have any effect on other layers. No limitations are imposed here.

[0071] By peeling off the rigid substrate layer included in the substrate layer 110, the adverse effects of the rigid substrate layer on changing the surface curvature of the flexible substrate layer, alignment layer 120 and liquid crystal layer 130 included in the substrate layer 110 can be avoided, thereby improving the fabrication flexibility of the polarizer holographic device 100.

[0072] For example, the liquid crystal layer 130 has adhesive properties.

[0073] In some embodiments, if the material comprising the liquid crystal layer 130 is adhesive, then the liquid crystal layer 130 is also adhesive. In some embodiments, the liquid crystal layer 130 comprises liquid crystal monomers doped with a predetermined adhesive material, and the liquid crystal layer 130 becomes adhesive under the action of the predetermined adhesive material.

[0074] For example, if the liquid crystal layer 130 includes liquid crystal monomers doped with a preset adhesive material, and the liquid crystal polymer formed after the liquid crystal monomers are cured is also doped with the preset adhesive material, then the liquid crystal layer 130 will still be adhesive.

[0075] In some embodiments, the surface of the liquid crystal layer 130 of the intermediate is attached and bonded to the connecting surface of the device layer 140.

[0076] Because the liquid crystal layer 130 is adhesive, when the connecting surface of the device layer 140 is connected to the liquid crystal layer 130 of the intermediate body, the connecting surface of the device layer 140 and the liquid crystal layer 130 of the intermediate body can be bonded according to the adhesiveness of the liquid crystal layer 130 to obtain the polarizer holographic device 100. For example, the connecting surface of the device layer 140 can be bonded to the surface of the liquid crystal layer 130 of the intermediate body that is offset from the alignment layer 120. Correspondingly, when the surface of the liquid crystal layer 130 of the intermediate body is attached and bonded to the connecting surface of the device layer 140, the curvature of the surface of the liquid crystal layer 130 can be changed according to the curvature of the connecting surface to obtain the polarizer holographic device 100.

[0077] In some embodiments, the connecting surface of the device layer 140 and the liquid crystal layer 130 of the intermediate are connected by an adhesive layer.

[0078] For example, the adhesive layer is adhesive. By attaching one side of the adhesive layer to the surface of the liquid crystal layer 130 of the intermediate body that is offset from the alignment layer 120, and attaching the other side of the adhesive layer to the connecting surface of the device layer 140, the connecting surface of the device layer 140 and the liquid crystal layer 130 can be connected to obtain the polarizer holographic device 100.

[0079] Based on this, different measures can be taken to connect the connecting curved surface of the device layer 140 to the liquid crystal layer 130 of the intermediate body to obtain the polarizing holographic device 100, which is beneficial to improve the ease of fabrication and flexibility of the polarizing holographic device 100.

[0080] In some embodiments, the liquid crystal layer 130 of the polarizer holographic device 100 undergoes a secondary curing process.

[0081] For example, when fabricating a polarizer holographic device 100, the liquid crystal layer 130 included in the polarizer holographic device 100 can be subjected to a secondary curing process to increase the polymerization degree of the liquid crystal layer 130. For example, when performing a secondary curing process on the liquid crystal layer 130 included in the polarizer holographic device 100, the liquid crystal layer 130 of the polarizer holographic device 100 can be subjected to a second exposure curing process. Of course, it is also possible to choose not to perform a secondary curing process on the liquid crystal layer 130 of the polarizer holographic device 100, and this is not a limitation.

[0082] The increased degree of polymerization of the liquid crystal layer 130 enhances its stability and durability. As a result, the surface curvature of the liquid crystal layer 130 after secondary curing under normal conditions will not continue to change, thereby improving the stability of the polarizer holographic device 100.

[0083] In some embodiments, at least one of the substrate layer 110 and the alignment layer 120 of the polarizer holographic device 100 is stripped.

[0084] When the polarizer holographic device 100 is fabricated, at least one of the substrate layer 110 and the alignment layer 120 included in the polarizer holographic device 100 can be peeled off to reduce the volume and weight of the polarizer holographic device 100.

[0085] For example, if the adhesive force between the liquid crystal layer 130 and the device layer 140 is greater than the adhesive force between the substrate layer 110 and the alignment layer 120, the substrate layer 110 is peeled off.

[0086] For example, if the adhesive force between the liquid crystal layer 130 and the device layer 140 is greater than the adhesive force between the substrate layer 110 and the alignment layer 120, the substrate layer 110 can be peeled off by using a force that is less than the adhesive force between the liquid crystal layer 130 and the device layer 140 but greater than the adhesive force between the substrate layer 110 and the alignment layer 120.

[0087] For example, if the adhesive force between the liquid crystal layer 130 and the device layer 140 is greater than the adhesive force between the alignment layer 120 and the liquid crystal layer 130, the alignment layer 120 is peeled off.

[0088] For example, if the adhesive force between the liquid crystal layer 130 and the device layer 140 is greater than the adhesive force between the alignment layer 120 and the liquid crystal layer 130, the alignment layer 120 can be peeled off by using a force that is less than the adhesive force between the liquid crystal layer 130 and the device layer 140 but greater than the adhesive force between the alignment layer 120 and the liquid crystal layer 130.

[0089] Of course, this is not the only option. When stripping the alignment layer 120 of the polarizer holographic device 100, the alignment layer 120 can also be dissolved to achieve stripping. During the dissolution of the alignment layer 120, no other layers in the polarizer holographic device 100 besides the alignment layer 120 will be dissolved, nor will it have any effect on other layers besides the alignment layer 120. No limitations are imposed here.

[0090] Of course, it is also possible to retain the base layer 110 and the orientation layer 120 of the polarizer holographic device 100; no restrictions are imposed here.

[0091] Thus, by stripping at least one of the substrate layer 110 and the orientation layer 120 of the polarizer holographic device 100, the volume and weight of the polarizer holographic device 100 can be reduced.

[0092] The fabrication method of the polarizer holographic device 100 provided in the above embodiment includes: setting an alignment layer 120 on a first surface of a substrate layer 110; setting a liquid crystal layer 130 on a surface of the alignment layer 120 opposite to the substrate layer 110 to obtain an intermediate; connecting a connecting surface of a device layer 140 to the liquid crystal layer 130 of the intermediate to obtain the polarizer holographic device 100; wherein, the connecting surface is used to make the surface curvature of the substrate layer 110 in the polarizer holographic device 100 different from the surface curvature of the substrate layer 110 in the intermediate, the surface curvature of the alignment layer 120 in the polarizer holographic device 100 different from the surface curvature of the alignment layer 120 in the intermediate, and the surface curvature of the liquid crystal layer 130 in the polarizer holographic device 100 different from the surface curvature of the liquid crystal layer 130 in the intermediate.

[0093] Under the influence of the connecting curved surface, the surface curvature of the substrate layer 110, alignment layer 120, and liquid crystal layer 130 in the intermediate body changes, i.e., it changes according to the curvature of the connecting curved surface. This is equivalent to the polarizer holographic device 100 being fabricated on the curved substrate. Accordingly, the polarizer holographic device 100 fabricated on the curved substrate can be a polarizer holographic device 100 with a curved surface shape. Based on this, by fabricating a polarizer holographic device 100 with a curved surface shape, the substrate layer 110, alignment layer 120, and liquid crystal layer 130 under the curved surface shape are bonded to the device layer 140 with the connecting curved surface, which is equivalent to achieving the bonding of the curved substrate and the curved optical device, thereby forming a corresponding optical system. Compared with an optical system composed of a planar polarizer holographic device and a curved optical device, such as an optical system composed of a planar substrate and a curved optical device, the polarizer holographic device 100 with a curved surface shape is advantageous for achieving a smaller optical system volume. Furthermore, since the curved substrate included in the curved polarizer holographic device 100 can provide optical power or optical modulation capability to the polarizer holographic device 100, it is beneficial to improve the optical modulation performance of the polarizer holographic device 100.

[0094] Please refer to Figure 3, which is a schematic diagram of a polarizer holographic device 100 provided in an embodiment of this application.

[0095] As shown in Figure 3, the polarizer holographic device 100 includes a substrate layer 110, an alignment layer 120, a liquid crystal layer 130, and a device layer 140.

[0096] The orientation layer 120 is disposed on the first surface of the base layer 110.

[0097] The liquid crystal layer 130 is disposed on the surface of the alignment layer 120 opposite to the substrate layer 110.

[0098] The connecting surface of device layer 140 is connected to liquid crystal layer 130; the connecting surface is used to make the surface curvature of substrate layer 110 in polarizer holographic device 100 different from the surface curvature of substrate layer 110 before liquid crystal layer 130 is connected to the connecting surface, the surface curvature of alignment layer 120 in polarizer holographic device 100 different from the surface curvature of alignment layer 120 before liquid crystal layer 130 is connected to the connecting surface, and the surface curvature of liquid crystal layer 130 in polarizer holographic device 100 different from the surface curvature of liquid crystal layer 130 before liquid crystal layer 130 is connected to the connecting surface.

[0099] For example, the surface curvature of the substrate layer 110, alignment layer 120, and liquid crystal layer 130 can all be changed. Therefore, when the connecting surface of device layer 140 is connected to the liquid crystal layer 130, the surface curvature of the substrate layer 110, alignment layer 120, and liquid crystal layer 130 can be changed according to the curvature of the connecting surface to obtain a polarizing holographic device 100. The polarizing holographic device 100 is essentially a curved-surface polarizing holographic device 100. The curved-surface polarizing holographic device 100 achieves the bonding of a curved substrate and curved optical devices, thereby forming a corresponding optical system. Compared to an optical system composed of a planar polarizing holographic device and curved optical devices, such as an optical system composed of a planar substrate and curved optical devices, the curved-surface polarizing holographic device 100 is advantageous for achieving a smaller optical system volume. Correspondingly, the curved substrate of the polarizer holographic device 100 can provide optical power or optical modulation capability to the polarizer holographic device 100, which is beneficial to improving the optical modulation performance of the polarizer holographic device 100.

[0100] For example, device layer 140 may include gratings, lenses, etc., without limitation.

[0101] In some embodiments, the base layer 110 is a flexible base layer.

[0102] For example, if the flexible substrate is made of a flexible material, it possesses the property of bending without breaking. The first surface of the flexible substrate can serve as the first surface of the substrate 110 for setting the alignment layer 120. Based on this, when the connecting surface of the device layer 140 is connected to the liquid crystal layer 130, the flexible substrate can change its surface curvature according to the curvature of the connecting surface. Accordingly, when the surface curvature of the flexible substrate changes, the flexible substrate will not break, which helps to improve the stability of the polarizer holographic device 100.

[0103] In some embodiments, the substrate layer 110 includes a flexible substrate layer and a rigid substrate layer; a first surface of the flexible substrate layer is used to form the alignment layer 120; and the rigid substrate layer is used to be removed before the connection surface of the device layer 140 is connected to the liquid crystal layer 130.

[0104] For example, if the rigid substrate is made of a rigid material, it does not possess bending properties. The surface of the flexible substrate that deviates from the rigid substrate can serve as the first surface of the flexible substrate for setting the alignment layer 120. Based on this, before the connecting surface of the device layer 140 is connected to the liquid crystal layer 130, the rigid substrate can be removed, allowing the flexible substrate, alignment layer 120, and liquid crystal layer 130 included in the substrate layer 110 to change their respective surface curvature when the connecting surface of the device layer 140 is connected to the liquid crystal layer 130. Thus, the polarizer holographic device 100 can be a polarizer holographic device 100 with a curved surface shape.

[0105] In some implementations, the flexible substrate layer is used to connect to the rigid substrate layer via a substrate adhesive layer.

[0106] For example, the substrate adhesive layer is prepared based on an adhesive material. One side of the substrate adhesive layer can be bonded to the surface of the flexible substrate layer near the rigid substrate layer, and the other side of the substrate adhesive layer can be bonded to the surface of the rigid substrate layer near the flexible substrate layer, thereby connecting the flexible substrate layer and the rigid substrate layer. Accordingly, when the rigid substrate layer is removed, the substrate adhesive layer can also be removed. For example, if the adhesive force between the alignment layer 120 and the flexible substrate layer included in the substrate layer 110 is greater than the adhesive force between the flexible substrate layer and the substrate adhesive layer, the substrate adhesive layer and the rigid substrate layer can be peeled off. Alternatively, the separation of the flexible substrate layer and the rigid substrate layer can be achieved by dissolving the substrate adhesive layer. The dissolving solution used when dissolving the substrate adhesive layer does not dissolve other layers besides the substrate adhesive layer and does not affect other layers. No limitations are imposed here.

[0107] In some embodiments, an alignment layer 120 is coated on a first surface of a substrate layer 110, and the alignment layer 120 is used to form the alignment layer 120 after polarization exposure.

[0108] For example, when the alignment layer 120 is coated on the first surface of the substrate layer 110, the alignment layer 120 can be oriented by polarization exposure. For example, the alignment layer 120 can be oriented by either interference exposure or polarization mask exposure.

[0109] In some embodiments, the liquid crystal layer 130 is coated on the surface of the alignment layer 120 opposite to the substrate layer 110, and the liquid crystal layer 130 is used for curing after alignment by the alignment layer 120.

[0110] For example, a coating technique can be used to coat the liquid crystal layer 130 onto the surface of the alignment layer 120 facing away from the substrate layer 110. Accordingly, the alignment of the alignment layer 120 can determine the alignment of the liquid crystal layer 130.

[0111] After the liquid crystal layer 130 is aligned by the alignment layer 120, it can be cured. The cured liquid crystal layer 130 is a non-rigid state with high elasticity or a certain degree of elasticity. Based on this, when the connecting surface of the device layer 140 is connected to the liquid crystal layer 130, the surface curvature of the liquid crystal layer 130 can be changed according to the curvature of the connecting surface. Correspondingly, when the connecting surface of the device layer 140 is connected to the liquid crystal layer 130, the surface curvature of the substrate layer 110 and the alignment layer 120 can also be changed according to the curvature of the connecting surface, so the polarizer holographic device 100 is essentially fabricated on a curved substrate.

[0112] For example, the liquid crystal layer 130 is adhesive; the surface of the liquid crystal layer 130 is used to adhere to and bond to the connection surface of the device layer 140.

[0113] In some embodiments, if the material comprising the liquid crystal layer 130 is adhesive, then the liquid crystal layer 130 is also adhesive. In some embodiments, the liquid crystal layer 130 comprises liquid crystal monomers doped with a predetermined adhesive material, and the liquid crystal layer 130 becomes adhesive under the action of the predetermined adhesive material.

[0114] For example, if the liquid crystal layer 130 includes liquid crystal monomers doped with a preset adhesive material, and the liquid crystal polymer formed after the liquid crystal monomers are cured is also doped with the preset adhesive material, then the liquid crystal layer 130 will still be adhesive.

[0115] When the liquid crystal layer 130 is bonded to the connecting curved surface of the device layer 140, since the liquid crystal layer 130 has a highly elastic state or a non-rigid state with a certain degree of elasticity, the curvature of the surface of the liquid crystal layer 130 can be changed according to the curvature of the connecting curved surface. Furthermore, the liquid crystal layer 130 will not break when the surface curvature changes, which is beneficial to improving the stability of the polarizer holographic device 100.

[0116] In some embodiments, the polarizer holographic device 100 is used to connect the connection region of the device layer 140 to the liquid crystal layer 130 via an adhesive layer.

[0117] For example, the adhesive layer is adhesive. By attaching one side of the adhesive layer to the surface of the liquid crystal layer 130 of the intermediate body that is offset from the alignment layer 120, and attaching the other side of the adhesive layer to the connecting surface of the device layer 140, the connecting surface of the device layer 140 and the liquid crystal layer 130 can be connected to obtain the polarizer holographic device 100.

[0118] In some embodiments, the polarizer holographic device 100 is used to perform a secondary curing process on the liquid crystal layer 130.

[0119] For example, the secondary curing process can include secondary exposure curing. Since the cured liquid crystal layer 130 is in a highly elastic state or a non-rigid state with a certain degree of elasticity, the degree of polymerization of the liquid crystal layer 130 can be increased through secondary curing, so that the surface curvature of the liquid crystal layer 130 after secondary curing will not continue to change under normal conditions, thereby improving the stability of the polarizer holographic device 100. Of course, it is not limited to this; it is also possible to choose not to perform secondary curing on the liquid crystal layer 130 of the polarizer holographic device 100, which is not a limitation here.

[0120] When the surface curvature of the substrate layer 110, alignment layer 120, and liquid crystal layer 130 of the polarizer holographic device 100 changes according to the curvature of the connecting surface of the device layer 140, the polarizer holographic device 100 can be a curved polarizer holographic device 100. Therefore, the polarizer holographic device 100 can combine the optical power or optical modulation capability provided by the curved shape to perform corresponding optical modulation, which is beneficial to improving the optical modulation performance of the polarizer holographic device 100. Correspondingly, for the curved polarizer holographic device 100, since the surface curvature of the substrate layer 110, alignment layer 120, and liquid crystal layer 130 of the polarizer holographic device 100 changes according to the curvature of the connecting surface of the device layer 140, the curved polarizer holographic device 100 achieves the bonding of the curved substrate and the curved optical device, thereby forming a corresponding optical system. Compared to an optical system composed of a planar polarizer holographic device and a curved optical device, an optical system composed of a curved polarizer holographic device 100 and a curved optical device is advantageous for achieving a smaller size.

[0121] The polarizer holographic device 100 of this application embodiment can be referred to the description of the preparation method of the polarizer holographic device 100 provided in the above embodiments, and will not be repeated here.

[0122] Please refer to Figure 4, which is a schematic diagram of another polarizer holographic device 100 provided in an embodiment of this application.

[0123] As shown in Figure 4, the polarizer holographic device 100 includes at least a liquid crystal layer 130 and a device layer 140.

[0124] The connecting surface of the device layer 140 is connected to the liquid crystal layer 130; the surface curvature of the liquid crystal layer 130 in the polarizer holographic device 100 is different from the surface curvature of the liquid crystal layer 130 before it is connected to the connecting surface; the polarizer holographic device 100 is obtained by peeling off at least one of the substrate layer 110 and the alignment layer 120 included in the polarizer holographic device 100 provided in the embodiments of this application.

[0125] Since the surface curvature of the liquid crystal layer 130 or the alignment layer 120 included in the polarizer holographic device 100 is changed according to the curvature of the connecting surface of the device layer 140, the polarizer holographic device 100 is a polarizer holographic device 100 with a curved surface.

[0126] For example, the substrate 110 is used to be peeled off when the adhesive force between the liquid crystal layer 130 and the device layer 140 is greater than the adhesive force between the substrate 110 and the alignment layer 120.

[0127] For example, the alignment layer 120 is used to be peeled off when the adhesive force between the liquid crystal layer 130 and the device layer 140 is greater than the adhesive force between the alignment layer 120 and the liquid crystal layer 130. However, this is not a limitation; when peeling off the alignment layer 120 of the polarizer holographic device 100, the alignment layer 120 can also be dissolved to achieve peeling. In this process, the dissolution of the alignment layer 120 will not dissolve or affect other layers in the polarizer holographic device 100 other than the alignment layer 120. No limitations are imposed here.

[0128] By stripping at least one of the substrate layer 110 and the alignment layer 120, the volume and weight of the polarizer holographic device 100 can be reduced to obtain a miniaturized polarizer holographic device 100.

[0129] The polarizer holographic device 100 of this application embodiment can be referred to the preparation method and / or description of the polarizer holographic device 100 provided in the above embodiments, and will not be repeated here.

[0130] It should be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. It should be noted that, herein, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0131] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above descriptions are merely specific implementations of this application, but the scope of protection 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 scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for fabricating a polarizing holographic device, comprising: An orientation layer is disposed on the first surface of the substrate layer; A liquid crystal layer is disposed on the surface of the alignment layer opposite to the substrate layer to obtain an intermediate; A connecting surface of the device layer is connected to the liquid crystal layer of the intermediate to obtain a polarizing holographic device; wherein, the connecting surface is used to make the surface curvature of the substrate layer in the polarizing holographic device different from the surface curvature of the substrate layer in the intermediate, the surface curvature of the alignment layer in the polarizing holographic device different from the surface curvature of the alignment layer in the intermediate, and the surface curvature of the liquid crystal layer in the polarizing holographic device different from the surface curvature of the liquid crystal layer in the intermediate.

2. The preparation method according to claim 1, wherein, The method of setting an alignment layer on the first surface of the substrate layer includes: An alignment layer is coated on the first surface of the substrate layer; The alignment layer is subjected to polarization exposure to form the alignment of the alignment layer.

3. The preparation method according to claim 1, wherein, The base layer is a flexible base layer.

4. The preparation method according to claim 1, wherein, The substrate layer includes a flexible substrate layer and a rigid substrate layer; The process of coating an alignment layer on the first surface of the substrate layer includes: setting an alignment layer on the first surface of the flexible substrate layer; Before connecting the connecting surface of the device layer to the liquid crystal layer of the intermediate, the method further includes: removing the rigid substrate layer.

5. The preparation method according to claim 4, wherein, The flexible substrate layer is connected to the rigid substrate layer through a substrate adhesive layer.

6. The preparation method according to claim 1, wherein, The method of depositing a liquid crystal layer on the surface of the alignment layer opposite to the substrate layer to obtain an intermediate includes: A liquid crystal layer is coated on the surface of the alignment layer opposite to the substrate layer, so as to align the liquid crystal layer through the alignment layer; The liquid crystal layer is cured to obtain the intermediate.

7. The preparation method according to claim 1, wherein, The liquid crystal layer is adhesive; the connection of the connecting surface of the device layer to the liquid crystal layer of the intermediate body includes: The surface of the liquid crystal layer of the intermediate is attached and bonded to the connecting surface of the device layer.

8. The preparation method according to claim 1, wherein, The connection of the device layer's connecting surface to the intermediate liquid crystal layer includes: The connecting surface of the device layer and the liquid crystal layer of the intermediate are connected by an adhesive layer.

9. The preparation method according to claim 1, wherein, After connecting the connecting surface of the device layer to the liquid crystal layer of the intermediate body to obtain the polarizer holographic device, the fabrication method further includes: The liquid crystal layer of the polarizer holographic device undergoes a secondary curing process.

10. The preparation method according to claim 1, wherein, After connecting the connecting surface of the device layer to the liquid crystal layer of the intermediate body to obtain the polarizer holographic device, the fabrication method further includes: At least one of the substrate layer and orientation layer of the polarizer holographic device is stripped away.

11. A polarizing holographic device, comprising: basal layer; An orientation layer is disposed on a first surface of the substrate layer; A liquid crystal layer is disposed on the surface of the alignment layer opposite to the substrate layer; as well as A device layer, wherein a connecting surface of the device layer is connected to the liquid crystal layer; the connecting surface is used to make the surface curvature of the substrate layer in the polarizer holographic device different from the surface curvature of the substrate layer before the liquid crystal layer is connected to the connecting surface, the surface curvature of the alignment layer in the polarizer holographic device different from the surface curvature of the alignment layer before the liquid crystal layer is connected to the connecting surface, and the surface curvature of the liquid crystal layer in the polarizer holographic device different from the surface curvature of the liquid crystal layer before the liquid crystal layer is connected to the connecting surface.

12. The polarizer holographic device according to claim 11, wherein, The alignment layer is applied to the first surface of the substrate layer, and the alignment layer is used to form the alignment layer after polarization exposure.

13. The polarizer holographic device according to claim 11, wherein, The base layer is a flexible base layer.

14. The polarizer holographic device according to claim 11, wherein, The substrate layer includes a flexible substrate layer and a rigid substrate layer; The first surface of the flexible substrate layer is used to form an orientation layer; The rigid substrate layer is used to be removed before the connection surface of the device layer is connected to the liquid crystal layer.

15. The polarizer holographic device according to claim 14, wherein, The flexible base layer is used to connect to the rigid base layer via a base adhesive layer.

16. The polarizer holographic device according to claim 11, wherein, The liquid crystal layer is coated on the surface of the alignment layer opposite to the substrate layer, and the liquid crystal layer is used for curing after being aligned by the alignment layer.

17. The polarizer holographic device according to claim 11, wherein, The liquid crystal layer is adhesive; the surface of the liquid crystal layer is used to attach and bond to the connecting curved surface of the device layer.

18. The polarizer holographic device according to claim 11, wherein, The polarizer holographic device is used to connect the connecting surface of the device layer to the liquid crystal layer via an adhesive layer.

19. The polarizer holographic device according to claim 11, wherein, The polarizer holographic device is used to perform a secondary curing process on the liquid crystal layer.

20. A polarizing body holographic device, the polarizing body holographic device comprising at least: Liquid crystal layer; as well as A device layer, wherein the connecting surface of the device layer is connected to the liquid crystal layer; The surface curvature of the liquid crystal layer in the polarizing holographic device is different from the surface curvature of the liquid crystal layer before the liquid crystal layer is connected to the connecting surface. The polarizing holographic device is obtained by peeling off at least one of the base layer and the orientation layer of the polarizing holographic device as described in claim 11.

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