Interference liquid crystal polarizer, preparation method thereof, and electronic device

Abstract

This application provides an interferometric liquid crystal polarizer, a method for preparing the same, and an electronic device, which can reduce the thickness of the polarizer while also lowering the manufacturing complexity. The interferometric liquid crystal polarizer comprises: an alignment substrate; and multiple liquid crystal dye layers, wherein the multiple liquid crystal dye layers are sequentially stacked on one side of the alignment substrate, and each liquid crystal dye layer is formed by coating a mixture of polymerizable nematic liquid crystal and a dichroic dye; the ratio of the polymerizable nematic liquid crystal to the dichroic dye in the liquid crystal dye layer alternates between high and low as it moves away from the alignment substrate.

Description

Technical Field

[0001] The present application relates to the field of polarization technology, and in particular to an interferometric liquid crystal polarizer, a preparation method thereof, and an electronic device. Background Art

[0002] The mainstream process for preparing linear polarizers is generally the wet stretching production process. Since the PVA (polyvinyl alcohol) base material of the functional absorption layer in the linear polarizer is easily water-absorbent, two layers of TAC (Triacetate Cellulose, a thermoplastic plastic) protective film need to be added to the outside of the functional absorption layer to keep the overall thickness of the linear polarizer at the order of 0.1mm to 0.2mm. This is too thick for some special applications (such as foldable screen displays) and is not easy to fold.

[0003] In order to reduce the thickness of the polarizer, a liquid crystal linear polarizer has appeared on the market. It is made based on polymerizable liquid crystal materials, does not require a TAC protective film layer, can significantly reduce the thickness of the polarizer, is easy to fold, and has been successfully used in folding mobile phones.

[0004] However, existing liquid crystal polarizers are all made of a mixture of polymerizable liquid crystals and dichroic dyes coated into a film, which places extremely high demands on the orderliness of the liquid crystal. For example, the liquid crystal is required to be in a layered smectic state before polymerization, that is, the liquid crystal needs to be in a complex smectic layered phase (molecules are arranged in layers, and the long axes of the molecules in the layers are parallel to each other), which makes process control more difficult. Summary of the Invention

[0005] One advantage of the present application is that it provides an interferometric liquid crystal polarizer, a preparation method thereof, and an electronic device, which can reduce the thickness of the polarizer while reducing the process difficulty.

[0006] Another advantage of the present application is that it provides an interferometric liquid crystal polarizer, a preparation method thereof, and an electronic device. In one embodiment of the present application, the interferometric liquid crystal polarizer only requires the liquid crystal to be in an ordinary nematic phase, and does not require the liquid crystal to be in a complex smectic lamellar phase, which is conducive to significantly reducing process difficulty and reducing costs.

[0007] Another advantage of the present application is to provide an interferometric liquid crystal polarizer, a preparation method thereof, and an electronic device. In one embodiment of the present application, the interferometric liquid crystal polarizer can double the effective absorption optical path through interface reflection, thereby effectively improving the extinction ratio.

[0008] Another advantage of the present application is that it provides an interferometric liquid crystal polarizer, a preparation method thereof, and an electronic device. In one embodiment of the present application, the interferometric liquid crystal polarizer can control the thickness of each layer at the nanometer level, making it easy to control the orientation of the dye, so as to effectively increase the effective concentration of the dye in the polarizer and increase the overall absorption efficiency.

[0009] Another advantage of the present application is to provide an interferometric liquid crystal polarizer, a preparation method thereof, and an electronic device. In one embodiment of the present application, the interferometric liquid crystal polarizer can provide a thinner, flexible, and foldable linear polarizer under the same extinction ratio requirement.

[0010] Another advantage of this application is that it provides an interferometric liquid crystal polarizer, a method for preparing the same, and an electronic device, wherein to achieve the aforementioned objectives, the application does not require the use of expensive materials or complex structures. Therefore, this application successfully and effectively provides a solution that not only provides a simple interferometric liquid crystal polarizer, a method for preparing the same, and an electronic device, but also increases the practicality and reliability of the interferometric liquid crystal polarizer, a method for preparing the same, and an electronic device.

[0011] In order to achieve at least one of the above advantages or other advantages and purposes of the present application, the present application provides an interferometric liquid crystal polarizer, comprising:

[0012] an alignment substrate; and

[0013] A plurality of liquid crystal dye layers, wherein the plurality of liquid crystal dye layers are stacked in sequence on one side of the alignment substrate, and each of the liquid crystal dye layers is formed by coating a mixture of polymerizable nematic liquid crystal and a dichroic dye; along the direction away from the alignment substrate, the ratio between the polymerizable nematic liquid crystal and the dichroic dye in the liquid crystal dye layer changes alternately from high to low.

[0014] According to one embodiment of the present application, the ratio between the polymerizable nematic liquid crystal and the dichroic dye in two liquid crystal dye layers adjacent to any one liquid crystal dye layer is the same.

[0015] According to an embodiment of the present application, the ratio between the polymerizable nematic liquid crystal and the dichroic dye in each liquid crystal dye layer 20 is γ:1, where γ>1.

[0016] According to one embodiment of the present application, the product of the effective refractive index of each liquid crystal dye layer in a direction parallel to the long axis of the liquid crystal molecules and the thickness of the liquid crystal dye layer is equal to one quarter of the wavelength of the incident light.

[0017] According to one embodiment of the present application, the number of the liquid crystal dye layers in the interferometric liquid crystal polarizer is N, where N≥100.

[0018] According to one embodiment of the present application, the difference between the extraordinary light refractive index of the polymerizable nematic liquid crystal and the refractive index of the dichroic dye is greater than the absolute difference between the ordinary light refractive index of the polymerizable nematic liquid crystal and the refractive index of the dichroic dye.

[0019] According to one embodiment of the present application, the relative difference between the refractive index of the dichroic dye and the ordinary light refractive index of the polymerizable nematic liquid crystal is less than 5%.

[0020] According to one embodiment of the present application, the refractive index of the dichroic dye is equal to the ordinary light refractive index of the polymerizable nematic liquid crystal.

[0021] According to one aspect of the present application, the present application further provides an electronic device, which includes any of the above-mentioned interferometric liquid crystal polarizers.

[0022] According to another aspect of the present application, the present application further provides a method for preparing an interferometric liquid crystal polarizer, comprising the steps of:

[0023] Mixing a polymerizable nematic liquid crystal and a dichroic dye according to a preset ratio to obtain at least two liquid crystal dye mixtures with different ratios; and

[0024] Different liquid crystal dye mixtures are alternately coated on one side of the alignment substrate to form multiple liquid crystal dye layers stacked on the alignment substrate, so that the ratio between the polymerizable nematic phase liquid crystal and the dichroic dye in the liquid crystal dye layer changes alternately. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of an interferometric liquid crystal polarizer according to an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the polarization principle of the interferometric liquid crystal polarizer according to the above embodiment of the present application is shown;

[0027] Figure 3 It is a schematic flow chart of a method for preparing an interferometric liquid crystal polarizer according to an embodiment of the present application.

[0028] Description of main component symbols:

[0029] 1. Interference liquid crystal polarizer; 10. Alignment substrate; 20. Liquid crystal dye layer; 21. Polymerizable nematic liquid crystal; 22. Dichroic dye; 201. First liquid crystal dye layer; 202. Second liquid crystal dye layer; 203. Third liquid crystal dye layer; 204. Fourth liquid crystal dye layer; 20N, Nth liquid crystal dye layer.

[0030] The above description of the main component symbols is combined with the accompanying drawings and specific implementation methods to further illustrate this application in detail. DETAILED DESCRIPTION

[0031] The following description is intended to disclose the present application and enable those skilled in the art to implement the present application. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art may readily conceive of other obvious variations. The basic principles of the present application defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present application.

[0032] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting this application.

[0033] In this application, the term "a" or "an" in the claims and the specification should be understood as "one or more." That is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple. Unless the disclosure of this application clearly indicates that the number of the element is only one, the term "a" or "an" should not be understood as unique or singular, and the term "a" or "an" should not be understood as a limitation on quantity.

[0034] In the description of this application, it should be understood that "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of this application, it should be noted that, unless otherwise clearly specified and limited, "connected" and "connected" 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 or an electrical connection; it can be a direct connection or an indirect connection through a medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations 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 any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0036] Considering that existing liquid crystal polarizers require the liquid crystal to be in a layered smectic state before polymerization, which makes process control difficult, this application creatively proposes an interferometric liquid crystal polarizer, a preparation method, and an electronic device thereof, which can reduce the thickness of the polarizer while reducing the process difficulty.

[0037] Specifically, refer to the accompanying drawings of the present application. Figure 1 and Figure 2 According to one embodiment of the present application, an interferometric liquid crystal polarizer 1 is provided, which may include an alignment substrate 10 and a plurality of liquid crystal dye layers 20. The plurality of liquid crystal dye layers 20 are sequentially stacked on one side of the alignment substrate 10, and each liquid crystal dye layer 20 is formed by coating a mixture of polymerizable nematic liquid crystal 21 and a dichroic dye 22. It is understood that the alignment substrate 10 refers to a light-transmitting substrate with an alignment layer, which is used to control the orientation of liquid crystal molecules in the liquid crystal dye layer 20. It is understood that the dichroic dye 22 mentioned in the present application may be an iodine-containing material or a dye-containing material, as long as it has dichroism, and this application will not elaborate on this.

[0038] More specifically, if Figure 1 and Figure 2 As shown, the ratio of the polymerizable nematic liquid crystal 21 and the dichroic dye 22 in the liquid crystal dye layer 20 alternates between high and low along the direction away from the alignment substrate 10. That is, the liquid crystal dye ratio in any liquid crystal dye layer 20 is either higher or lower than the liquid crystal dye ratio in the two adjacent liquid crystal dye layers 20. This causes the effective refractive index of the liquid crystal dye layer 20 in the direction parallel to the long axis of the liquid crystal molecules to also alternate between high and low. In this way, for one polarization component of the incident light (unpolarized light with orthogonal polarization) parallel to the long axis of the liquid crystal molecules, a Bragg reflection effect is generated at the interface between the two adjacent liquid crystal dye layers 20. However, for the other polarization component of the incident light (perpendicular to the long axis of the liquid crystal molecules), no Bragg reflection occurs due to refractive index matching.

[0039] It is worth noting that since the polymerizable nematic liquid crystal 21 controls the orientation of the dye molecules in the dichroic dye 22 through the guest-host effect, that is, the dye molecules follow the orientation of the liquid crystal molecules, so a component polarization of the incident light parallel to the long axis of the liquid crystal molecules will be both Bragg reflected and absorbed by the dichroic dye 22 in the liquid crystal dye layer 20; while the other component polarization of the incident light perpendicular to the long axis of the liquid crystal molecules will neither be Bragg reflected nor absorbed by the dichroic dye 22, so that the component polarization of the incident light parallel to the long axis of the liquid crystal molecules cannot pass through the interferometric liquid crystal polarizer 1 due to reflection and absorption, while the other component polarization of the incident light perpendicular to the long axis of the liquid crystal molecules can smoothly pass through the interferometric liquid crystal polarizer 1, thereby achieving the light polarization effect.

[0040] In particular, since a component polarization parallel to the long axis of the liquid crystal molecules in the incident light will undergo Bragg reflection at the interface between two adjacent liquid crystal dye layers 20, the effective absorption optical path of the interferometric liquid crystal polarizer 1 for a component polarization parallel to the long axis of the liquid crystal molecules in the incident light is doubled, which can effectively improve the extinction ratio.

[0041] In addition, the interferometric liquid crystal polarizer 1 of the present application only needs to use ordinary nematic phase liquid crystals, without the need to use complex smectic lamellar phase liquid crystals, and the process control difficulty is relatively low, which is conducive to reducing costs.

[0042] For example, Figure 2 As shown, the long axes of the liquid crystal molecules are aligned horizontally. The horizontal polarization component of the incident light is defined as the first polarized light component P, and the polarization component of the incident light perpendicular to the paper is defined as the second polarized light component S. A portion of the first polarized light component P of the incident light is absorbed by the dichroic dye 22 in the liquid crystal dye layer 20 when passing through the liquid crystal dye layer 20, while another portion of the first polarized light component P of the incident light undergoes Bragg reflection at the interface between two adjacent liquid crystal dye layers 20. The reflected first polarized light component P is then again absorbed by the dichroic dye 22 in the liquid crystal dye layer 20, doubling the effective absorption path length of the interferometric liquid crystal polarizer 1 for the first polarized light component P, significantly improving the extinction ratio. At the same time, all of the second polarized light component S in the incident light, neither reflected nor absorbed, efficiently transmits through the interferometric liquid crystal polarizer 1, improving the polarization quality and effect of the interferometric liquid crystal polarizer 1.

[0043] Alternatively, as Figure 1As shown, the number of liquid crystal dye layers 20 in the interferometric liquid crystal polarizer 1 is N, where N ≥ 100. For example, along a direction away from the alignment substrate 10, the plurality of liquid crystal dye layers 20 are sequentially implemented as a first liquid crystal dye layer 201, a second liquid crystal dye layer 202, a third liquid crystal dye layer 203, a fourth liquid crystal dye layer 204, and so on, to an Nth liquid crystal dye layer 20N. The liquid crystal dye ratio in the second liquid crystal dye layer 202 is higher or lower than the liquid crystal dye ratios in the first liquid crystal dye layer 201 and the third liquid crystal dye layer 203, and the liquid crystal dye ratio in the third liquid crystal dye layer 203 is lower or higher than the liquid crystal dye ratios in the second liquid crystal dye layer 202 and the fourth liquid crystal dye layer 204. Similarly, the liquid crystal dye ratios of the N liquid crystal dye layers 20 alternate between high and low, ensuring that the effective refractive index of the N liquid crystal dye layers 20 in a direction parallel to the long axis of the liquid crystal molecules also alternates between high and low.

[0044] Preferably, the ratio of the polymerizable nematic liquid crystal 21 to the dichroic dye 22 in two adjacent liquid crystal dye layers 20 is the same, ensuring that the liquid crystal dye ratios of the N liquid crystal dye layers 20 exhibit a cyclic alternating change. For example, the liquid crystal dye ratios in the first liquid crystal dye layer 201 and the third liquid crystal dye layer 203 are the same; the liquid crystal dye ratios in the second liquid crystal dye layer 202 and the fourth liquid crystal dye layer 204 are the same; and the liquid crystal dye ratio in the first liquid crystal dye layer 201 is different from the liquid crystal dye ratio in the second liquid crystal dye layer 202. It is understood that in other examples of the present application, the liquid crystal dye ratios in the first liquid crystal dye layer 201 and the third liquid crystal dye layer 203 may also be different, but the difference in the liquid crystal dye ratios between the first liquid crystal dye layer 201 and the third liquid crystal dye layer 203 is not equal to the difference in the liquid crystal dye ratios between the first liquid crystal dye layer 201 and the second liquid crystal dye layer 202, so that the liquid crystal dye ratios exhibit a cyclic alternating change. This application will not elaborate further on this.

[0045] It is worth noting that in order to achieve a good orientation effect, the ratio between the polymerizable nematic liquid crystal 21 and the dichroic dye 22 in each liquid crystal dye layer 20 is implemented as γ:1, where γ>1, that is, the proportion γ / (γ+1) of the polymerizable nematic liquid crystal 21 is greater than the proportion 1 / (γ+1) of the dichroic dye 22, so that the liquid crystal molecules in the polymerizable nematic liquid crystal 21 can better control the orientation of the dye molecules in the dichroic dye 22 through the guest-host effect, so as to ensure that the long axis direction of the dye molecules remains parallel to the long axis direction of the liquid crystal molecules.

[0046] In addition, the ratio difference between the polymerizable nematic liquid crystal 21 and the dichroic dye 22 in two adjacent liquid crystal dye layers 20 should be as large as possible, so that the difference between the effective refractive index of the two adjacent liquid crystal dye layers 20 in the direction parallel to the long axis of the liquid crystal molecules is increased as much as possible, so as to enhance the Bragg reflection effect of the first component polarized light P at the interface between the two adjacent liquid crystal dye layers 20.

[0047] Preferably, if Figure 2 As shown, the product of the effective refractive index n of each liquid crystal dye layer 20 in the direction parallel to the long axis of the liquid crystal molecules and the thickness d of the liquid crystal dye layer 20 is equal to one-quarter the wavelength of the incident light. For example, the wavelength is selected to be 550 nm so as to utilize the light interference effect to maximize the Bragg reflection of the first component polarized light P at the interface between two adjacent liquid crystal dye layers 20.

[0048] It is worth noting that in other examples of the present application, the product of the effective refractive index n of each liquid crystal dye layer 20 in the direction parallel to the long axis of the liquid crystal molecules and the thickness d of the liquid crystal dye layer 20 may also have a small difference from one-quarter wavelength of the incident light. For example, if the difference is within 20%, a reflection effect that meets the requirements can still be achieved.

[0049] In addition, since the thickness d of each liquid crystal dye layer 20 is less than or equal to one-quarter the wavelength of the incident light, that is, the thickness d of each liquid crystal dye layer 20 is at the nanometer level, even if the number of liquid crystal dye layers 20 stacked in the interference type liquid crystal polarizer 1 reaches the order of 100 layers, the thickness of the interference type liquid crystal polarizer 1 is still on the order of several microns, and still maintains the thickness advantage over the traditional polarizer; that is, the interference type liquid crystal polarizer 1 of the present application not only avoids the process difficulty of the liquid crystal smectic phase, but also has the advantage of ultra-thin thickness and is easy to fold.

[0050] It should be noted that since the thickness d of each liquid crystal dye layer 20 is at the nanometer level, the orientation of the dye molecules of the dichroic dye 22 in the liquid crystal dye layer 20 is easier to control, and thus the proportion of the dichroic dye 22 in the liquid crystal dye layer 20 can be significantly increased, thereby increasing the absorption efficiency. Preferably, the ratio γ:1 between the polymerizable nematic liquid crystal 21 and the dichroic dye 22 in the liquid crystal dye layer 20 can be close to 1, so as to effectively increase the effective concentration of the dichroic dye 22 in the interferometric liquid crystal polarizer 1, thereby effectively increasing the overall absorption efficiency. In addition, the dichroic dye 22 mentioned in this application can also achieve light absorption in a target wide band, such as the visible light band.

[0051] For example, the liquid crystal dye ratio in the first liquid crystal dye layer 201 is 1.5:1, the liquid crystal dye ratio in the second liquid crystal dye layer 202 is 4:1, the liquid crystal dye ratio in the third liquid crystal dye layer 203 is 1.5:1, and the liquid crystal dye ratio in the fourth liquid crystal dye layer 204 is 4:1, and so on. This not only increases the effective concentration of the dichroic dye 22, but also ensures that there is a large difference in the liquid crystal dye ratio between the two adjacent liquid crystal dye layers 20.

[0052] It is worth noting that, because the polymerizable nematic liquid crystal 21 has a relatively small ordinary refractive index no (i.e., corresponding to the direction of light wave vibration perpendicular to the long axis of the liquid crystal molecules) and a relatively large extraordinary refractive index ne (i.e., corresponding to the direction of light wave vibration parallel to the long axis of the liquid crystal molecules), and the dichroic dye 22 has the same refractive index nr in both directions, the effective refractive index n of each liquid crystal dye layer 20 in the direction parallel to the long axis of the liquid crystal molecules is calculated by averaging the extraordinary refractive index ne of the polymerizable nematic liquid crystal 21 and the refractive index nr of the dichroic dye 22 according to the liquid crystal dye ratio, i.e., n=(γ×ne+nr) / (γ+1). Therefore, the effective refractive index n of the liquid crystal dye layer 20 in the direction parallel to the long axis of the liquid crystal molecules changes with changes in the liquid crystal dye ratio, resulting in the effective refractive index n of the liquid crystal dye layer 20 in the direction parallel to the long axis of the liquid crystal molecules exhibiting alternating high and low variations, thereby ensuring that the first component polarized light P senses the alternating changes in the effective refractive index and is efficiently reflected.

[0053] In addition, due to the inherent characteristics of the dye, the refractive index nr of the dichroic dye 22 is usually smaller than the extraordinary light refractive index ne of the polymerizable nematic liquid crystal 21, and is close to the ordinary light refractive index no of the polymerizable nematic liquid crystal 21; that is, the difference between the extraordinary light refractive index ne of the polymerizable nematic liquid crystal 21 and the refractive index nr of the dichroic dye 22 is greater than the absolute difference between the ordinary light refractive index no of the polymerizable nematic liquid crystal 21 and the refractive index nr of the dichroic dye 22.

[0054] Preferably, the relative difference between the refractive index nr of the dichroic dye 22 and the ordinary refractive index no of the polymerizable nematic liquid crystal 21 is less than 5%, making the refractive index nr of the dichroic dye 22 as close as possible to the ordinary refractive index no of the polymerizable nematic liquid crystal 21. This ensures that the effective refractive index (γ×no+nr) / (γ+1) of each liquid crystal dye layer 20 in the direction perpendicular to the long axis of the liquid crystal molecules is always close to no, regardless of the liquid crystal dye ratio. This ensures that the second component polarized light P experiences minimal refractive index variation, reducing the risk of reflection. It should be understood that the relative difference mentioned in this application refers to 100%×|nr-no| / no.

[0055] More preferably, the refractive index nr of the dichroic dye 22 is equal to the ordinary refractive index no of the polymerizable nematic liquid crystal 21, so that the effective refractive index of each liquid crystal dye layer 20 in the direction perpendicular to the long axis of the liquid crystal molecules is equal to no. This ensures that the second component polarized light P experiences only the refractive index no, with neither reflection nor absorption. It is understood that the effective refractive index n of the liquid crystal dye layer 20 in the direction parallel to the long axis of the liquid crystal molecules of the present application is n = (γ × ne + no) / (γ + 1) > no.

[0056] It is worth mentioning that, according to one aspect of the present application, an embodiment of the present application further provides an electronic device, which may include the interferometric liquid crystal polarizer 1, so as to implement a light polarization function using the interferometric liquid crystal polarizer 1. For example, the electronic device may be implemented as, but is not limited to, a foldable screen equipped with the interferometric liquid crystal polarizer 1, or a mobile phone equipped with the foldable screen.

[0057] It is worth mentioning that, according to another aspect of the present application, Figure 3 As shown, one embodiment of the present application further provides a method for preparing an interferometric liquid crystal polarizer, which may include the following steps:

[0058] S100: mixing a polymerizable nematic liquid crystal and a dichroic dye according to a preset ratio to obtain at least two liquid crystal dye mixtures with different ratios; and

[0059] S200: Alternately coating liquid crystal dye mixtures with different ratios on one side of an alignment substrate to form a plurality of liquid crystal dye layers stacked on the alignment substrate, so that the ratio between the polymerizable nematic phase liquid crystal and the dichroic dye in the liquid crystal dye layer changes alternately from high to low.

[0060] It is worth noting that the coating mentioned in this application can be implemented by, but is not limited to, spin coating, spray coating or roller coating, as long as the liquid crystal dye mixture can be coated into a film layer, and this application will not elaborate on this.

[0061] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0062] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present application, and all such modifications and improvements fall within the scope of protection of the present application.

Claims

1. An interferometric liquid crystal polarizer, characterized in that: include: Alignment base; and A plurality of liquid crystal dye layers, wherein the plurality of liquid crystal dye layers are stacked in sequence on one side of the alignment substrate, and each of the liquid crystal dye layers is formed by coating a mixture of polymerizable nematic liquid crystal and a dichroic dye; along the direction away from the alignment substrate, the ratio between the polymerizable nematic liquid crystal and the dichroic dye in the liquid crystal dye layer changes alternately from high to low.

2. The interferometric liquid crystal polarizer according to claim 1, wherein: The ratio between the polymerizable nematic liquid crystal and the dichroic dye in two liquid crystal dye layers adjacent to any one liquid crystal dye layer is the same.

3. The interferometric liquid crystal polarizer according to claim 1, wherein: The ratio between the polymerizable nematic liquid crystal and the dichroic dye in each liquid crystal dye layer is γ:1, wherein γ>1.

4. The interferometric liquid crystal polarizer according to claim 1, wherein: The product of the effective refractive index of each liquid crystal dye layer in a direction parallel to the long axis of the liquid crystal molecules and the thickness of the liquid crystal dye layer is equal to a quarter of the wavelength of the incident light.

5. The interferometric liquid crystal polarizer according to claim 1, wherein: The number of the liquid crystal dye layers in the interferometric liquid crystal polarizer is N, where N is greater than or equal to 100.

6. The interferometric liquid crystal polarizer according to any one of claims 1 to 5, wherein: A difference between an extraordinary refractive index of the polymerizable nematic liquid crystal and a refractive index of the dichroic dye is greater than an absolute difference between an ordinary refractive index of the polymerizable nematic liquid crystal and a refractive index of the dichroic dye.

7. The interferometric liquid crystal polarizer according to claim 6, wherein: The relative difference between the refractive index of the dichroic dye and the ordinary light refractive index of the polymerizable nematic liquid crystal is less than 5%.

8. The interferometric liquid crystal polarizer according to claim 7, wherein: The refractive index of the dichroic dye is equal to the ordinary light refractive index of the polymerizable nematic liquid crystal.

9. An electronic device, characterized in that The electronic device comprises the interferometric liquid crystal polarizer according to any one of claims 1 to 8.

10. A method for preparing an interferometric liquid crystal polarizer, characterized in that: Including steps: Mixing a polymerizable nematic liquid crystal and a dichroic dye according to a preset ratio to obtain at least two liquid crystal dye mixtures with different ratios; and Different liquid crystal dye mixtures are alternately coated on one side of the alignment substrate to form multiple liquid crystal dye layers stacked on the alignment substrate, so that the ratio between the polymerizable nematic phase liquid crystal and the dichroic dye in the liquid crystal dye layer changes alternately.

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