Liquid crystal superposition structure and folding optical system

Abstract

The utility model provides a liquid crystal superposition structure and a folding optical system, which can improve the optical effect of multilayer liquid crystal superposition while reducing the manufacturing difficulty. The liquid crystal superposition structure comprises a pair of light-transmitting substrates which are arranged at intervals; each liquid crystal film layer comprises a liquid crystal alignment layer and a liquid crystal coating layer, the liquid crystal alignment layers are correspondingly stacked on the inner surface of the light-transmitting substrate, the liquid crystal coating layers are correspondingly formed on the liquid crystal alignment layers in a coating mode, and a pouring space is formed between the two liquid crystal coating layers; and the liquid crystal filling layer is formed in the filling space in a filling manner so as to be superposed between the two liquid crystal coating layers.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystals, and particularly to a liquid crystal stacking structure and a folding optical system. Background Art

[0002] Optical applications of liquid crystals require multi-layer stacking in many scenarios. For example, three-layer nematic liquid crystal (abbreviated as NLC in English) can achieve a broadband phase retardation wave plate to replace the traditional broadband quarter-wave plate; three-layer cholesteric liquid crystal (abbreviated as CLC in English) can achieve broadband Bragg reflection to cover the entire visible light band.

[0003] There are mainly two existing methods for preparing liquid crystals: one is to pour liquid crystals between two pieces of glass to form a liquid crystal cell; the other is to coat polymerized liquid crystals on a substrate to form a liquid crystal film layer. However, on the one hand, due to the relatively complex manufacturing process of the liquid crystal film layer and the less mature control of the orientation of liquid crystal molecules compared to the liquid crystal cell, multi-layer liquid crystal film layer stacking faces greater challenges; on the other hand, when multiple liquid crystal cells are directly stacked, the liquid crystal layers will be isolated by the substrate glass, and the thickness of the substrate glass is much larger than the film layer thickness, which will seriously affect the optical effect. Summary of the Utility Model

[0004] One advantage of the present application is to provide a liquid crystal stacking structure and a folding optical system, which can improve the optical effect of multi-layer liquid crystal stacking while reducing the manufacturing difficulty.

[0005] One advantage of the present application is to provide a liquid crystal stacking structure, a folding optical system and a preparation method thereof, which can reduce the processing difficulty of achieving the same optical effect simply by multi-layer film stacking.

[0006] Another advantage of the present application is to provide a liquid crystal stacking structure and a folding optical system. In one embodiment of the present utility model, the liquid crystal stacking structure can have an additional phase modulation function to correct chromatic aberration, spherical aberration, etc. of a lens.

[0007] Another advantage of the present application is to provide a liquid crystal stacking structure and a folding optical system. In one embodiment of the present utility model, the liquid crystal stacking structure can form a naturally matched folding optical with a semi-transmissive and semi-reflective film without the need for a quarter-wave plate for conversion, which helps to simplify the folding optical system.

[0008] Another advantage of the present application is to provide a liquid crystal stacking structure and a folding optical system. Among them, in one embodiment of the present utility model, the preparation method of the liquid crystal stacking structure can take into account the single-layer liquid crystal film manufacturing process and the liquid crystal cell manufacturing process to achieve the effect of multi-layer liquid crystal stacking.

[0009] Another advantage of the present application is to provide a liquid crystal stacking structure and a folding optical system. Among them, in one embodiment of the present utility model, the preparation method of the liquid crystal stacking structure can utilize the N-layer liquid crystal film stacking process to achieve the stacking effect of 2N + 1 layers of liquid crystal.

[0010] Another advantage of the present application is to provide a liquid crystal stacking structure and a folding optical system. Among them, in one embodiment of the present utility model, the preparation method of the liquid crystal stacking structure can not only be applied to nematic liquid crystals to achieve broadband phase delay, but also be applied to cholesteric liquid crystals to achieve broadband Bragg reflection.

[0011] Another advantage of the present application is to provide a liquid crystal stacking structure and a folding optical system. Among them, in one embodiment of the present utility model, the folding optical system can have no interfering reflections between the two reflecting surfaces of the folding optics, and no other functional films are required, achieving the zeroing of the reflection interface and the zeroing of the functional film layer, so as to have excellent optical performance.

[0012] Another advantage of the present application is to provide a liquid crystal stacking structure and a folding optical system. In order to achieve the above-mentioned at least one advantage or other advantages and purposes of the present application, in the present utility model, expensive materials or complex structures do not need to be adopted. Therefore, the present utility model successfully and effectively provides a solution, not only providing a simple liquid crystal stacking structure and a folding optical system, but also increasing the practicability and reliability of the liquid crystal stacking structure and the folding optical system.

[0013] To achieve at least one of the above advantages or other advantages and purposes of the present application, the present utility model provides a liquid crystal stacking structure, including:

[0014] A pair of light-transmitting substrates arranged at intervals;

[0015] A pair of liquid crystal film layers, each of the liquid crystal film layers including a liquid crystal alignment layer correspondingly stacked on the inner surface of the light-transmitting substrate and a liquid crystal coating layer correspondingly coated and formed on the liquid crystal alignment layer, and a perfusion space is formed between the two liquid crystal coating layers; and

[0016] A liquid crystal perfusion layer, which is perfusion-formed in the perfusion space to be stacked between the two liquid crystal coating layers.

[0017] According to an embodiment of the present application, each of the liquid crystal film layers is formed by laminating one of the liquid crystal alignment layers and one or more of the liquid crystal coating layers.

[0018] According to an embodiment of the present application, both the liquid crystal coating layer and the liquid crystal perfusion layer are cholesteric liquid crystals.

[0019] According to an embodiment of the present application, the two liquid crystal film layers and one liquid crystal perfusion layer have different reflection bands.

[0020] According to an embodiment of the present application, the two liquid crystal film layers and one liquid crystal perfusion layer all have the function of phase or wavefront modulation.

[0021] According to an embodiment of the present application, both the liquid crystal coating layer and the liquid crystal perfusion layer are nematic liquid crystals.

[0022] On the other hand, according to the present application, the present application further provides a folding optical system, including:

[0023] The liquid crystal stacking structure as described in any one of the above, wherein the liquid crystal coating layer and the liquid crystal perfusion layer in the liquid crystal stacking structure are both cholesteric liquid crystals; and

[0024] A semi-transmissive semi-reflective element, which is arranged at one side of the liquid crystal stacking structure at intervals.

[0025] According to an embodiment of the present application, the folding optical system further includes a refractive optical element, and the refractive optical element is arranged between the liquid crystal stacking structure and the semi-transmissive semi-reflective element.

[0026] According to an embodiment of the present application, the refractive optical element is a plano-curved lens; one of the light-transmitting substrates of the liquid crystal stacking structure is glued to the plane of the plano-curved lens, and the semi-transmissive semi-reflective element is attached to the curved surface of the plano-curved lens.

[0027] According to an embodiment of the present application, the semi-transmissive semi-reflective element is a semi-transmissive semi-reflective film glued to the curved surface of the plano-curved lens.

[0028] According to an embodiment of the present application, the folding optical system further includes an optical lens, and the optical lens is glued to the surface of the liquid crystal stacking structure on the side away from the semi-transmissive semi-reflective element.

[0029] On the other hand, according to the present application, the present application further provides a folding optical system, including:

[0030] The liquid crystal stacking structure as described in any one of the above, wherein the liquid crystal coating layer and the liquid crystal perfusion layer in the liquid crystal stacking structure are both cholesteric liquid crystals;

[0031] Reflective elements, spaced apart and disposed on one side of the liquid crystal stack structure; and

[0032] A curved surface prism, disposed between the liquid crystal stack structure and the reflective elements; the curved surface prism has an inclined surface glued to a light-transmitting substrate of the liquid crystal stack structure, a curved surface attached to the reflective elements, and a light incident surface facing away from the inclined surface and the curved surface.

[0033] According to an embodiment of the present application, the reflective element is a partially reflective and transmissive film or a total reflection film glued to the curved surface of the curved surface prism.

[0034] According to another aspect of the present application, the present application further provides a method for preparing a liquid crystal stack structure, including the steps of:

[0035] Coating an alignment layer material on one side surface of the light-transmitting substrate to form a liquid crystal alignment layer after alignment;

[0036] Coating a liquid crystal material on the liquid crystal alignment layer to form a liquid crystal coating layer after polymerization, so that a liquid crystal film layer is formed on one side surface of the light-transmitting substrate;

[0037] Symmetrically buckling two light-transmitting substrates, and the liquid crystal film layer is located on the inner surface of the light-transmitting substrate to form an infusion space between the two liquid crystal coating layers; and

[0038] Infusing a liquid crystal material into the infusion space to form a liquid crystal infusion layer between the two liquid crystal coating layers, and aligning the liquid crystal infusion layer through the liquid crystal film layer to obtain a liquid crystal stack structure.

[0039] According to another aspect of the present application, the present application further provides a method for preparing a folded optical system, including the steps of:

[0040] Providing the liquid crystal stack structure described in any one of the above, wherein both the liquid crystal coating layer and the liquid crystal infusion layer in the liquid crystal stack structure are cholesteric liquid crystals;

[0041] Gluing one side light-transmitting substrate of the liquid crystal stack structure to the plane of a plano-curved lens; and

[0042] Gluing a semi-reflective and semi-transmissive film to the curved surface of the plano-curved lens.

[0043] According to an embodiment of the present application, the method for preparing the folded optical system further includes the step of:

[0044] Gluing an optical lens to the other side light-transmitting substrate of the liquid crystal stack structure that is away from the semi-reflective and semi-transmissive film.

[0045] According to another aspect of the present application, the present application further provides a method for preparing a folded optical system, including the steps of:

[0046] Provide the liquid crystal stacking structure described in any one of the above, wherein the liquid crystal coating layer and the liquid crystal filling layer in the liquid crystal stacking structure are both cholesteric liquid crystals;

[0047] Glue one side of the light-transmitting substrate of the liquid crystal stacking structure to the inclined surface of the curved prism; and

[0048] Glue a partial semi-reflective film or a total reflective film to the curved surface of the curved prism. Description of the Drawings

[0049] Figure 1 It is a schematic structural diagram of a liquid crystal stacking structure according to an embodiment of the present application;

[0050] Figure 2 It is a schematic principle diagram of a folded optical system according to an embodiment of the present application;

[0051] Figure 3 Shows an example of a folded optical system according to the above embodiment of the present application;

[0052] Figure 4 Shows a deformed example of a folded optical system according to the above embodiment of the present application;

[0053] Figure 5 It is a schematic flow diagram of a preparation method of a liquid crystal stacking structure according to an embodiment of the present application;

[0054] Figure 6 It is a schematic flow diagram of a preparation method of a folded optical system according to an embodiment of the present application;

[0055] Figure 7 It is a schematic flow diagram of a preparation method of a folded optical system according to another embodiment of the present application.

[0056] Main element symbol description: 1, folded optical system; 10, liquid crystal stacking structure; 100, filling space; 11, light-transmitting substrate; 12, liquid crystal film layer; 121, liquid crystal alignment layer; 122, liquid crystal coating layer; 13, liquid crystal filling layer; 20, semi-reflective and semi-transmissive element; 200, semi-reflective and semi-transmissive film; 30, refractive optical element; 40, optical lens; 50, reflective element; 60, curved prism; 61, inclined surface; 62, curved surface; 63, incident light surface.

[0057] The above main element symbol description further describes the present application in detail in combination with the drawings and specific embodiments. Detailed Description of the Invention

[0058] The following description is used to disclose the present utility model so that those skilled in the art can implement the present utility model. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present utility model can be applied to other implementation schemes, variation schemes, improvement schemes, equivalent schemes, and other technical schemes that do not depart from the spirit and scope of the present utility model.

[0059] Those skilled in the art should understand that in the disclosure of the present utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on the present utility model.

[0060] In the present utility model, the term "a" in the claims and the specification should be understood as "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. Unless it is clearly indicated in the disclosure of the present utility model that the number of the element is only one, the term "a" should not be understood as unique or single, and the term "a" should not be construed as a limitation on the number.

[0061] In the description of the present utility model, it should be understood that terms such as "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be a direct connection, or an indirect connection through a medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0062] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] Considering that the existing manufacturing process of the liquid crystal film layer is relatively complex, and the orientation control of liquid crystal molecules is not as mature as that of the liquid crystal cell, resulting in greater challenges in the superposition of multiple liquid crystal film layers; while directly superposing multiple liquid crystal cells, the thickness of the substrate glass isolating the liquid crystal layer is much larger than the film layer thickness, which will seriously affect the optical effect. Therefore, this application creatively proposes a liquid crystal superposition structure and a folding optical system, which can improve the optical effect of multi-layer liquid crystal superposition while reducing the manufacturing difficulty.

[0064] Specifically, referring to the accompanying drawings of the specification of this application Figure 1 , according to an embodiment of this application, a liquid crystal superposition structure 10 is provided, which may include a pair of light-transmitting substrates 11 arranged at intervals, a pair of liquid crystal film layers 12, and a liquid crystal perfusion layer 13.

[0065] More specifically, as Figure 1 shown, each liquid crystal film layer 12 includes a liquid crystal alignment layer 121 correspondingly stacked on the inner surface of the light-transmitting substrate 11 and a liquid crystal coating layer 122 correspondingly coated and formed on the liquid crystal alignment layer 121, and a perfusion space 100 is formed between the two liquid crystal coating layers 122. The liquid crystal perfusion layer 13 is perfusion-formed in the perfusion space 100 to be stacked between the two liquid crystal coating layers 122.

[0066] In this way, the liquid crystal superposition structure 10 of this application can not only achieve the superposition effect of multiple liquid crystal layers, but also use the liquid crystal perfusion process to multiply reduce the number of superposed liquid crystal film layers, so as to greatly reduce the manufacturing difficulty of multi-layer liquid crystal superposition. Moreover, it can use the liquid crystal coating layer 122 to replace the traditional substrate to form the perfusion space 100 and act as the alignment layer of the liquid crystal perfusion layer 13 to form a single liquid crystal cell. In other words, the liquid crystal superposition structure 10 of this application takes into account the excellent optical performance of the liquid crystal film layer and the mature manufacturing process of the liquid crystal cell, so as to achieve the effect of three-layer liquid crystal superposition only by using the single-layer liquid crystal film manufacturing process, which helps to expand the bandwidth.

[0067] It should be noted that, in the above embodiments of the present application, as Figure 1 shown, each liquid crystal film layer 12 can be formed by laminating a liquid crystal alignment layer 121 and a liquid crystal coating layer 122, so that the liquid crystal stacking structure 10 can achieve the effect of triple liquid crystal stacking; in other embodiments of the present application, each liquid crystal film layer 12 can also be formed by laminating a liquid crystal alignment layer 121 and N liquid crystal coating layers 122, so that the liquid crystal stacking structure 10 can achieve the effect of (2N + 1)-layer liquid crystal stacking, where N is a positive integer greater than 1.

[0068] In addition, the light-transmitting substrate 11 mentioned in the present application can be a rigid substrate such as glass, or a flexible substrate such as PET; the liquid crystal coating layer 122 and the liquid crystal perfusion layer 13 mentioned in the present application can be implemented as cholesteric liquid crystals to achieve broadband Bragg reflection, or can be implemented as nematic liquid crystals to achieve broadband phase retardation wave plates. It can be understood that the cholesteric liquid crystal (English: Cholesteric liquid crystal; abbreviation: CLC) mentioned in the present application, as a material with strong polarization selectivity, reflects all circularly polarized light of a certain specific handedness at an angle that satisfies Bragg's law, and can transmit all circularly polarized light of the other handedness.

[0069] Exemplarily, taking the case where both the liquid crystal coating layer 122 and the liquid crystal perfusion layer 13 are implemented as cholesteric liquid crystals, the liquid crystal stacking structure 10 forms a reflective circular polarizer for reflecting the first circularly polarized light and transmitting the second circularly polarized light with the opposite handedness to the first circularly polarized light. It can be understood that the first circularly polarized light mentioned in the present application can be implemented as left-handed circularly polarized light or right-handed circularly polarized light; correspondingly, the second circularly polarized light is correspondingly implemented as right-handed circularly polarized light or left-handed circularly polarized light.

[0070] Optionally, the two liquid crystal film layers 12 and one liquid crystal perfusion layer 13 have different reflection bands to achieve better broadband Bragg reflection, which helps to weaken the dispersion phenomenon and avoid serious dispersion problems like traditional folded optics. For example, the reflection bands of the two liquid crystal film layers 12 and one liquid crystal perfusion layer 13 respectively correspond to the red, green, and blue bands, so as to weaken the dispersion when modulating white light or colored light.

[0071] It should be noted that the optical properties of the liquid crystal film layer 12 mentioned in the present application are determined by the liquid crystal alignment layer 121, and the optical properties of the liquid crystal perfusion layer 13 mentioned in the present application are determined by the liquid crystal coating layer 122 acting as an alignment layer. That is, based on a specific alignment layer design and exposure, both the liquid crystal film layer 12 and the liquid crystal coating layer 122 can have a light power similar to that of a lens and are planar optical elements capable of modulating reflected light.

[0072] In addition, different from traditional volume holography, the liquid crystal film layer 12 of the present application can record lens information on the liquid crystal alignment layer 121 by means of two-beam interference, so that the reflection surface of the liquid crystal coating layer 122 changes from a traditional plane to a curved surface, that is, its reflection surface is not always perpendicular to the helical axis everywhere, but does not affect the basic law of reflection imaging, which is equivalent to forming a reflection lens for reflecting the first circularly polarized light on the curved surface.

[0073] Optionally, the liquid crystal film layer 12 and the liquid crystal perfusion layer 13 have a phase or wavefront modulation function to correct chromatic aberration, spherical aberration, etc. of the lens.

[0074] It is worth mentioning that, according to another aspect of the present application, as Figure 2 shown, an embodiment of the present application further provides a folding optical system 1, which may include the liquid crystal stacking structure 10 and a semi-reflective and semi-transmissive element 20 arranged at an interval from the liquid crystal stacking structure 10. The liquid crystal coating layer 122 and the liquid crystal perfusion layer 13 in the liquid crystal stacking structure 10 are both cholesteric liquid crystals. In this way, after the first circularly polarized light partially passes through the semi-reflective and semi-transmissive element 20, it is first reflected back to the semi-reflective and semi-transmissive element 20 by the liquid crystal stacking structure 10, and then reflected by the semi-reflective and semi-transmissive element 20 to form a second circularly polarized light; finally, the second circularly polarized light passes through the liquid crystal stacking structure 10. It can be understood that the semi-reflective and semi-transmissive element 20 mentioned in the present application refers to an optical element that reflects and transmits light in a certain proportion; for example, the semi-reflective and semi-transmissive element 20 is used to reflect half of the light and transmit the other half of the light.

[0075] It should be noted that the liquid crystal stacking structure 10 and the semi-reflective and semi-transmissive element 20 in the folding optical system 1 of the present application can together form a natural folding optics, without the need to additionally set a quarter-wave plate for conversion like traditional folding optics, avoiding the problem that when a problem occurs in the folding optical path of the quarter-wave plate, it will be magnified three times, so as to achieve a better folding optical effect.

[0076] Exemplarily, in an example of the present application, as Figure 3 shown, the folding optical system 1 mentioned in the present application generally may further include a refractive optical element 30 arranged between the liquid crystal stacking structure 10 and the semi-reflective and semi-transmissive element 20 to refract light in the folding optical path, realizing the convergence or divergence of light, and facilitating meeting the requirements such as imaging functions. It can be understood that the folding optical system 1 mentioned in the present application can be applied not only to perform imaging modulation in an imaging module, but also to other scenarios such as an eyepiece or an objective lens in a microscope, and the present application will not elaborate on this.

[0077] Optionally, as Figure 3As shown, the liquid crystal stack structure 10 and the semi-transmissive semi-reflective element 20 are respectively glued to opposite surface sides of the refractive optical element 30.

[0078] It should be noted that, as Figure 3 shown, the refractive optical element 30 can be implemented as a plano-curved lens. A light-transmitting substrate 11 of the liquid crystal stack structure 10 is glued to the plane of the plano-curved lens, and the semi-transmissive semi-reflective element 20 is attached to the curved surface of the plano-curved lens to form a CLC folded lens. In this way, although folded optics is extremely sensitive to interfering reflections, the folded optical system 1 of the present application can avoid interfering reflections by gluing lenses between the two reflecting surfaces forming the fold. That is, light does not undergo interfering reflections at the substrate surface of the liquid crystal stack structure 10 and at the plane and curved surface of the plano-curved lens, and there is no need to coat functional film layers such as anti-reflection films on the plane and curved surface of the plano-curved lens, so that the reflection interfaces in the folded optical system 1 are zeroed and the functional film layers are zeroed, which helps to realize a folded optical lens with excellent optical performance.

[0079] Optionally, as Figure 3 shown, the semi-transmissive semi-reflective element 20 is implemented as a semi-transmissive semi-reflective film 200 glued to the curved surface of the plano-curved lens. It can be understood that in other examples of the present application, the semi-transmissive semi-reflective element 20 can also be implemented as a semi-transmissive semi-reflective film coated on the curved surface of the plano-curved lens.

[0080] It should be noted that in the above examples of the present application, as Figure 3 shown, the folded optical system 1 can further include an optical lens 40. The optical lens 40 is glued to a surface side of the liquid crystal stack structure 10 that is away from the semi-transmissive semi-reflective element 20, so as to enhance the light modulation effect of the folded optical system 1 while ensuring that the reflection interfaces are zeroed and the functional film layers are zeroed. In other words, the plano-curved lens and the optical lens 40 in the folded optical system 1 of the present application are respectively implemented as folded optics and traditional optics, and the two are combined into an organic whole to better replace traditional lenses.

[0081] In addition, in the above embodiments of the present application, the plano-curved lens can be implemented as a plano-convex lens or a plano-concave lens; the optical lens 40 and the refractive optical element 30 are both implemented as exactly the same lens, and the optical lens 40 and the refractive optical element 30 are symmetrically glued to opposite surface sides of the liquid crystal stack structure 10. Of course, in other examples of the present application, the refractive optical element 30 can also be implemented as other types of lenses; or, the optical lens 40 and the refractive optical element 30 can also be implemented as different lenses, as long as they can be glued to the liquid crystal stack structure 10, and the present application will not elaborate on this.

[0082] It is worth mentioning that in a variant example of the present application, asFigure 4 As shown, the folding optical system 1 may also include the above-mentioned liquid crystal stacking structure 10, a reflection element 50 arranged at an interval from the liquid crystal stacking structure 10, and a curved prism 60 arranged between the liquid crystal stacking structure 10 and the reflection element 50. The liquid crystal coating layer 122 and the liquid crystal perfusion layer 13 in the liquid crystal stacking structure 10 are both cholesteric liquid crystals; the curved prism 60 has an inclined surface 61 glued to a light-transmitting substrate 11 of the liquid crystal stacking structure 10, a curved surface 62 attached to the reflection element 50, and a light incident surface 63 facing away from the inclined surface 61 and the curved surface 62, so as to form a CLC type BB (Birdbath) architecture. In this way, after the first circularly polarized light enters the curved prism 60 through the light incident surface 63, it first exits through the inclined surface 61 to be reflected back to the curved prism 60 by the liquid crystal stacking structure 10, and then exits through the curved surface 62 to be reflected by the reflection element 50 to form a second circularly polarized light; finally, the second circularly polarized light exits through the inclined surface 61 to pass through the liquid crystal stacking structure 10, realizing the BB optical architecture, which helps to obtain an excellent near-eye display effect.

[0083] Optionally, as Figure 4 shown, the reflection element 50 is implemented as a partially reflective and transmissive film glued to the curved surface 62 of the curved prism 60, so as to reflect a part of the light and transmit another part of the light, so that the folding optical system 1 can achieve an augmented reality effect. It can be understood that in other examples of the present application, the reflection element 50 can also be implemented as a total reflection film glued to the curved surface 62 of the curved prism 60, which is used to completely reflect light, so that the folding optical system 1 can achieve a virtual reality effect.

[0084] It is worth mentioning that according to another aspect of the present application, as Figure 5 shown, an embodiment of the present application further provides a preparation method of a liquid crystal stacking structure, which may include the steps of:

[0085] S110: Coating an alignment layer material on one side surface of the light-transmitting substrate to form a liquid crystal alignment layer after alignment;

[0086] S120: Coating a liquid crystal material on the liquid crystal alignment layer to form a liquid crystal coating layer after polymerization, so as to form a liquid crystal film layer on one side surface of the light-transmitting substrate;

[0087] S130: Symmetrically buckling two light-transmitting substrates, and the liquid crystal film layer is located on the inner surface of the light-transmitting substrate to form a perfusion space between the two liquid crystal coating layers; and

[0088] S140: Perfusing a liquid crystal material into the perfusion space to form a liquid crystal perfusion layer between the two liquid crystal coating layers, and aligning the liquid crystal perfusion layer through the liquid crystal film layer to obtain a liquid crystal stacking structure. ​

[0089] It should be noted that, according to another aspect of the present application, as Figure 6 shown, an embodiment of the present application further provides a method for preparing a folded optical system, which may include the steps of:

[0090] S210: Provide the above liquid crystal stack structure, wherein the liquid crystal coating layer and the liquid crystal perfusion layer in the liquid crystal stack structure are both cholesteric liquid crystals;

[0091] S220: Glue one side light-transmitting substrate of the liquid crystal stack structure to the plane of the plano-curved lens; and

[0092] S230: Glue the semi-reflective semi-transmissive film to the curved surface of the plano-curved lens.

[0093] Optionally, in the above embodiment of the present application, the method for preparing the folded optical system may further include the step of:

[0094] S240: Glue the optical lens to the other side light-transmitting substrate of the liquid crystal stack structure that is away from the semi-reflective semi-transmissive film.

[0095] In addition, in another embodiment of the present application, as Figure 7 shown, the method for preparing the folded optical system may include the steps of:

[0096] S310: Provide the above liquid crystal stack structure, wherein the liquid crystal coating layer and the liquid crystal perfusion layer in the liquid crystal stack structure are both cholesteric liquid crystals;

[0097] S320: Glue one side light-transmitting substrate of the liquid crystal stack structure to the inclined surface of the curved prism; and

[0098] S330: Glue the partially reflective transmissive film or the total reflection film to the curved surface of the curved prism.

[0099] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0100] The above embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A liquid crystal stacking structure, characterized in that: include: a pair of light-transmitting substrates arranged at intervals; A pair of liquid crystal film layers, each of the liquid crystal film layers comprises a liquid crystal alignment layer correspondingly stacked on the inner surface of the light-transmitting substrate and a liquid crystal coating layer correspondingly coated on the liquid crystal alignment layer, and a perfusion space is formed between the two liquid crystal coating layers; as well as A liquid crystal injection layer is injected into the injection space to be overlapped between the two liquid crystal coating layers.

2. The liquid crystal stacking structure according to claim 1, characterized in that: Each of the liquid crystal film layers is formed by stacking one of the liquid crystal alignment layers and one or more of the liquid crystal coating layers.

3. The liquid crystal stacking structure according to claim 1, characterized in that: The liquid crystal coating layer and the liquid crystal filling layer are both cholesteric liquid crystals.

4. The liquid crystal stacking structure according to any one of claims 1 to 3, characterized in that: The two liquid crystal film layers and the one liquid crystal perfusion layer have different reflection bands.

5. The liquid crystal stacking structure according to any one of claims 1 to 3, characterized in that: The two liquid crystal film layers and the one liquid crystal perfusion layer both have a phase or wavefront regulation function.

6. The liquid crystal stacking structure according to claim 1 or 2, characterized in that: The liquid crystal coating layer and the liquid crystal injection layer are both nematic liquid crystals.

7. A folded optical system, characterized in that include: The liquid crystal stacking structure according to any one of claims 1 to 5, wherein the liquid crystal coating layer and the liquid crystal perfusion layer in the liquid crystal stacking structure are both cholesteric liquid crystals; and The semi-reflective and semi-transmissive elements are arranged at intervals on one side of the liquid crystal stacking structure.

8. The folded optical system according to claim 7, characterized in that: The folding optical system further comprises a refractive optical element, which is arranged between the liquid crystal stacking structure and the semi-reflective and semi-transmissive element.

9. The folded optical system according to claim 8, characterized in that: The refractive optical element is a plano-curved lens; a light-transmitting substrate of the liquid crystal stacking structure is glued to the plane of the plano-curved lens, and the semi-reflective and semi-transmissive element is attached to the curved surface of the plano-curved lens.

10. The folded optical system according to claim 9, characterized in that: The semi-reflective and semi-transparent element is a semi-reflective and semi-transparent film glued on the curved surface of the plano-curved lens.

11. The folded optical system according to claim 9, characterized in that: The folding optical system further includes an optical lens, which is glued to a surface of the liquid crystal stacking structure that is away from the semi-reflective and semi-transmissive element.

12. A folded optical system, characterized in that include: The liquid crystal stacking structure according to any one of claims 1 to 5, wherein the liquid crystal coating layer and the liquid crystal perfusion layer in the liquid crystal stacking structure are both cholesteric liquid crystals; Reflective elements are arranged at intervals on one side of the liquid crystal stacking structure; as well as A curved prism is arranged between the liquid crystal stacking structure and the reflective element; the curved prism has an inclined surface glued to a transparent substrate of the liquid crystal stacking structure, a curved surface attached to the reflective element, and a light incident surface facing away from the inclined surface and the curved surface.

13. The folded optical system according to claim 12, characterized in that: The reflective element is a partially reflective film or a total reflective film glued onto the curved surface of the curved prism.

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