Polarizer, preparation method thereof, display panel and display device

Abstract

The invention discloses a polaroid and a preparation method thereof, a display panel and a display device, and relates to the technical field of display, and the preparation method of the polaroid comprises the following steps: providing a substrate; and preparing the polarization layer on one surface of the substrate by adopting a silane coupling agent, iodine molecules and / or dye molecules. According to the technical scheme, the overall light transmittance of the display panel can be improved, and the power consumption of the display device can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a polarizer, a preparation method thereof, a display panel and a display device. BACKGROUND

[0002] A polarizer is an optical element that can convert natural light into polarized light. In a liquid crystal display (LCD), polarizers are an indispensable component, which are placed on both sides of the liquid crystal layer to control the transmission and blocking of light.

[0003] The current polarizer is usually fixed on the substrate of the liquid crystal display by adhesive, which can cause the overall transmittance to decrease, that is, the brightness to decrease. In order to make up for the decrease in brightness, it is usually necessary to increase the brightness of the backlight or use a more efficient light source, which can increase the required voltage and increase the power consumption of the liquid crystal display. SUMMARY

[0004] The main purpose of the present application is to provide a polarizer, a preparation method thereof, a display panel and a display device, which aims to improve the transmittance of the display panel and reduce the power consumption of the display device.

[0005] To achieve the above purpose, the preparation method of the polarizer provided by the present application comprises the following steps:

[0006] providing a substrate;

[0007] using silane coupling agent, iodine molecules and / or dye molecules to prepare a polarization layer on a surface of the substrate.

[0008] In an embodiment, the step of using silane coupling agent, iodine molecules and / or dye molecules to prepare a polarization layer on a surface of the substrate comprises:

[0009] coating a silane coupling agent solution on a surface of the substrate, and forming a silane coupling agent layer after heat treatment;

[0010] coating an iodine molecule solution and / or a dye molecule solution on a surface of the silane coupling agent layer to form an iodine molecule layer and / or a dye molecule layer, and the silane coupling agent layer, the iodine molecule layer and / or the dye molecule layer together form the polarization layer.

[0011] In an embodiment, the step of using silane coupling agent, iodine molecules and / or dye molecules to prepare a polarization layer on a surface of the substrate comprises:

[0012] mixing a silane coupling agent solution with an iodine molecule solution and / or a dye molecule solution to obtain a mixed solution;

[0013] coating the mixed solution on a surface of the substrate, and forming a polarization layer after heat treatment.

[0014] In an embodiment, the temperature of the heat treatment is 40-80°C; and / or, the concentration of the silane coupling agent solution is 0.1-2wt%; and / or, the concentration of the iodine molecule solution is 0.1-1.5wt%; and / or, the concentration of the dye molecule solution is 0.01-2wt%.

[0015] In an embodiment, the amount of the iodine molecule and / or the dye molecule is 0.1-5% of the mass of the silane coupling agent; and / or, the silane coupling agent comprises at least one of an amino-based silane coupling agent, an epoxy-based silane coupling agent, and a vinyl-based silane coupling agent.

[0016] In an embodiment, the thickness of the polarizing layer is 4-60μm.

[0017] In an embodiment, the method further comprises, after the step of preparing the polarizing layer on the surface of the substrate using the silane coupling agent, the iodine molecule, and / or the dye molecule:

[0018] preparing a sensing film on the surface of the polarizing layer;

[0019] preparing a release film on the surface of the sensing film.

[0020] The present application also provides a polarizing sheet, comprising a substrate, a silane coupling agent layer disposed on the substrate, and an iodine molecule and / or dye molecule layer disposed on the silane coupling agent layer, wherein the silane coupling agent layer is chemically bonded to the substrate.

[0021] The present application also provides a display panel comprising the polarizing sheet as described above.

[0022] The present application also provides a display device comprising the display panel as described above.

[0023] The present application provides a method for preparing a polarizing sheet, which comprises preparing a polarizing layer on a surface of a substrate using a silane coupling agent, an iodine molecule, and / or a dye molecule. Thus, the polarizing sheet can be directly prepared on the substrate without the need of being fixed on the substrate by adhesion. When the polarizing sheet is applied to a display panel, the overall transmittance of the display panel is high, and the power consumption of the display device is relatively low. In addition, the silane coupling agent can react with the surface of the substrate to form a firm chemical bond, so that the adhesion stability of the polarizing sheet is high. The iodine molecule and / or the dye molecule can interact with the silane coupling agent, so that the ordered arrangement of the iodine molecule and / or the dye molecule can be achieved. Furthermore, the process flow of the method is relatively simple. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the technical solutions of the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from the structures shown in the drawings without any creative effort.

[0025] Figure 1 The flowchart of an embodiment of the preparation method of the polarizing plate provided by the present application is shown in the figure.

[0026] Figure 2 The flowchart of an embodiment of the preparation method of the polarizing plate provided by the present application is shown in the figure. Figure 1 The detailed flowchart of an embodiment of step S20 in the method is shown in the figure.

[0027] Figure 3 The detailed flowchart of an embodiment of step S20 in the method is shown in the figure. Figure 1 The detailed flowchart of an embodiment of step S20 in the method is shown in the figure.

[0028] Figure 4 The flowchart of another embodiment of the preparation method of the polarizing plate provided by the present application is shown in the figure.

[0029] Figure 5 The sectional structure schematic diagram of the polarizing plate prepared by the embodiment of the present application is shown in the figure.

[0030] Figure 6 The sectional structure schematic diagram of the polarizing plate prepared by the embodiment of the present application is shown in the figure.

[0031] Figure 7 The schematic diagram of the chemical bonding reaction principle between the silane coupling agent and the glass substrate is shown in the figure.

[0032] Explanation of the reference numerals:

[0033] 1, polarizing plate; 11, polarizing layer; 111, silane coupling agent layer; 112, iodine molecule and / or dye molecule layer; 12, transparent protective layer; 13, sensing film; 14, release film; 2, substrate; 2a, CF substrate; 21, glass substrate; 22, black matrix; 23, color filter film layer; 24, organic cover layer; 3, orientation layer.

[0034] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0036] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0037] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0038] A polarizing sheet is an optical element that can convert natural light into polarized light. In liquid crystal displays (LCDs), polarizing sheets are essential components that are placed on both sides of the liquid crystal layer to control the transmission and blocking of light.

[0039] The main function of a polarizing sheet is to selectively allow light in a specific direction to pass through while blocking light in other directions. This selective transmission property enables liquid crystal displays to display clear images and text. By controlling the arrangement of liquid crystal molecules, light control can be achieved, thereby displaying different images and text.

[0040] In addition, polarizing sheets can also be used to reduce reflection and glare, improving display effects. In strong sunlight environments, polarizing sheets can reduce the interference of reflected light, making the display content clearer and more visible. At the same time, polarizing sheets can also reduce the stimulation of glare on the eyes, protecting the health of the eyes.

[0041] The current liquid crystal display (LCD) protects two polarizing sheets, namely an upper polarizing sheet and a lower polarizing sheet, the upper polarizing sheet is on the upper layer of the color filter film, and the lower polarizing sheet is between the backlight and the circuit back plate. The film layer structure of the existing polarizing sheet and the lower polarizing sheet generally comprises a release film, a sensing film, a TAC (triacetyl cellulose) protective layer, a PVA (polyvinyl alcohol) film, a TAC protective layer and a protective film which are sequentially stacked. The preparation process comprises: immersing the PVA (polyvinyl alcohol) film in an aqueous solution of I2 / KI, so that the iodine ions diffuse deeply into the inner layer of the PVA, stretch after slight heating, the PVA film becomes longer and narrower, and gradually deflects in the direction of the force after being stretched, the iodine ions also have directionality, forming long chains of iodine ions. After the PVA film is stretched, a transparent protective layer composed of triacetyl cellulose (TAC) is attached to both sides of the PVA film, which can protect the PVA film and prevent the PVA film from shrinking. Then the sensing film and the release film are prepared.

[0042] After the polarizing sheet is prepared, it is usually fixed on the substrate of the display panel by adhesive. When the polarizing sheet is the upper polarizing sheet of the liquid crystal display, the upper polarizing sheet is fixed on the back of the CF substrate (i.e. the color filter (CF) substrate) by adhesive. When the polarizing sheet is the lower polarizing sheet of the liquid crystal display, the lower polarizing sheet is fixed on the back of the TFT substrate (i.e. the thin-film transistor (TFT) substrate) by adhesive. This will cause the overall transmittance of the display panel to decrease, that is, the brightness decreases. In order to compensate for the decrease in brightness, it is usually necessary to increase the brightness of the backlight or use a more efficient light source, which will increase the required voltage and increase the power consumption of the liquid crystal display.

[0043] In view of the above technical problems, the present application provides a preparation method of a polarizing sheet, which aims to improve the transmittance of the display panel and thus reduce the power consumption of the display device.

[0044] Please refer to Figure 1 The preparation method of the polarizing sheet 1 provided by the present application comprises the following steps:

[0045] Step S10, providing a substrate 2;

[0046] Step S20, preparing a polarization layer 11 on a surface of the substrate 2 by using a silane coupling agent, iodine molecules and / or dye molecules.

[0047] Specifically, the substrate 2 can be an organic substrate or an inorganic substrate, and can be a glass substrate. The polarizer 1 of the present application can be an upper polarizer 1 and / or a lower polarizer 1 in an LCD display panel. When the polarizer 1 is an upper polarizer 1, the substrate 2 is a CF substrate (i.e. the glass substrate therein) in the display panel. When the polarizer 1 is a lower polarizer 1, the substrate 2 is a TFT substrate (i.e. the glass substrate therein) in the display panel. Of course, the substrate 2 can also be other organic polymer substrates 2 or inorganic substrates 2 in the display panel, which are not limited herein and are within the protection scope of the present application.

[0048] The silane coupling agent is a kind of organic silicon compound containing silicon functional groups, and its general formula is R-SiX3, wherein R is an organic functional group having affinity or reactivity with polymers, and X is an alkoxyl group (such as methoxyl, ethoxyl, etc.) capable of hydrolysis. The silane coupling agent can form chemical bonds or hydrogen bonds between the organic polymer and the inorganic substrate, thereby enhancing the adhesion therebetween. When the polarizer 1 of the present application is an upper polarizer 1 in an LCD display panel, the silane coupling agent can form chemical bonds or hydrogen bonds with the surface of the CF substrate (i.e. the glass substrate therein), and the adhesion therebetween is strong, i.e. the adhesion stability of the upper polarizer 1 is high. When the polarizer 1 of the present application is a lower polarizer 1 in an LCD display panel, the silane coupling agent can form chemical bonds or hydrogen bonds with the surface of the TFT substrate (i.e. the glass substrate therein) in the display panel, and the adhesion therebetween is strong, i.e. the adhesion stability of the lower polarizer 1 is high.

[0049] Compared with the prior art of fixing the polarizer 1 by using adhesive, the present application directly fabricates the polarizer 1 on the substrate 2 by using the silane coupling agent, thereby improving the overall transmittance of the display panel.

[0050] After the overall transmittance of the display panel is improved, the required voltage is smaller when the display panel emits light with the same brightness, i.e. the power consumption of the display device is reduced. At the same time, the contrast ratio and color display accuracy of the display panel are also improved, thereby improving the display quality and providing a better visual experience for the user. In addition, after the overall transmittance of the display panel is improved, the quality requirements of other components related to transmittance can be appropriately lowered, such as the backlight component which does not need to be of high quality, high brightness, etc.

[0051] At the same time, the silane coupling agent does not contain toxic and harmful substances, and meets the environmental protection requirements. In the use process, it does not produce harmful gases or wastewater, which is beneficial to environmental protection. In addition, the silane coupling agent can form a dense protective film on the surface of the substrate 2, thereby effectively preventing the invasion of moisture, oxygen and gas corrosive media, improving the stability of the substrate 2, and thereby improving the stability and reliability of the display panel.

[0052] The iodine molecules and / or dye molecules can interact with the silane coupling agent, so that the ordered arrangement of the iodine molecules and / or dye molecules can be achieved, and the ordered arrangement is the basis of producing polarized light. Because light can be decomposed into two mutually perpendicular polarization components, when natural light passes through the polarizer 1, only the light vibrating along the direction of the molecular arrangement can pass through under the action of the iodine molecules or dye molecules, and the light vibrating in the vertical direction is absorbed or scattered, so that the polarization of light is achieved.

[0053] Compared with the existing preparation process of the polarizer 1, the preparation process of the polarizer 1 of the present application is simpler.

[0054] Please refer to Figure 2 In some embodiments, step S20 comprises the following steps:

[0055] Step S20a, the silane coupling agent solution is coated on one surface of the substrate 2, and after heat treatment, a silane coupling agent layer 111 is formed.

[0056] Specifically, first, the silane coupling agent solution is prepared, that is, the silane coupling agent is dissolved in a solvent, and the solvent can be selected from organic solvents such as alcohol solvents (including but not limited to ethanol, methanol, isopropanol) and acetone. Then the silane coupling agent solution is coated on one surface of the substrate 2 (which can be a glass substrate) by a coating method, and after heat treatment, the silane coupling agent in the silane coupling agent solution reacts with the surface of the substrate 2 (which can be a glass substrate), so that a silane coupling agent layer 111 can be prepared. The coating method includes but is not limited to dip coating, spray coating and spin coating.

[0057] It should be noted that before step S20a, the substrate 2 (which can be a glass substrate) can also be pretreated. Specifically, the substrate 2 (which can be a glass substrate) is cleaned with an organic solvent to remove organic matter on the surface, then washed with deionized water to remove residual solvent and other water-soluble impurities, and finally dried.

[0058] Step S20b, the iodine molecule solution and / or dye molecule solution is coated on the surface of the silane coupling agent layer 111 to form an iodine molecule and / or dye molecule layer 112, and the silane coupling agent layer 111 and the iodine molecule and / or dye molecule layer 112 together form a polarization layer 11.

[0059] Specifically, first, iodine molecule solution and / or dye molecule solution are prepared, the iodine molecule solution can be I2 / KI aqueous solution, the dye molecule solution includes dye molecules and solvent, the dye can be azo dye, anthraquinone dye, etc., the solvent includes but is not limited to water and alcohol solvent, or mixture. In order to optimize the dyeing process, the solution can also include additives, such as boric acid, which can play a role in stabilizing iodine ions during the iodine-based polarizer 1 dyeing process, thereby indirectly affecting the interaction between the dye molecules and the iodine ions, which helps to improve the polarization performance of the polarizer 1. Then the iodine molecule solution and / or dye molecule solution is coated on the surface of the silane coupling agent layer 111, the coating method includes but is not limited to dip coating, spray coating and spin coating. After drying, an iodine molecule and / or dye molecule layer 112 is formed. Thus, the silane coupling agent layer 111, the iodine molecule and / or dye molecule layer 112 together form the polarization layer 11.

[0060] In this embodiment, the silane coupling agent layer 111 is first prepared on the surface of the substrate 2 (which can be a glass substrate) and then the iodine molecule and / or dye molecule layer 112 is prepared, so that the polarization layer 11 has good adhesion stability, and the overall transmittance of the display panel is good.

[0061] The silane coupling agent and the glass substrate (i.e. substrate 2) undergo a chemical bonding reaction, the reaction principle is as shown in Figure 7 As can be seen from Figure 7 , the chemical bonding reaction between the silane coupling agent and the glass substrate (i.e. substrate 2) includes the following steps: (1) hydrolysis: the 3 Si-X groups connected to silicon in the silane coupling agent undergo hydrolysis to form Si-OH; (2) condensation: dehydration condensation between Si-OH to form oligomeric siloxane containing Si-OH; (3) forming hydrogen bonds: Si-OH in the oligomeric siloxane forms hydrogen bonds with the OH on the surface of the glass substrate; (4) forming covalent bonds: forming covalent bond connection with the surface of the glass substrate during the heating and curing process accompanied by dehydration reaction.

[0062] After the silane coupling agent and the glass substrate are completely reacted, the silane coupling agent layer 111 is formed on the substrate 2 (i.e. glass substrate), and the silane coupling agent layer 111 is chemically bonded to the substrate 2 (i.e. glass substrate). Then, the iodine molecule solution is coated on the surface of the silane coupling agent layer, the silane coupling agent usually contains primary amino organic functional group R'—NH2, when coated with iodine molecules, the following reaction can occur: R'—NH2+I2→R'—NH-I+HI, that is, iodine ions are dispersed to —NH2 to form NHI, so that the iodine molecule layer is formed. Of course, when coated with dye molecules, the above similar reaction will also occur, so that the dye molecule layer is formed.

[0063] In the embodiment of the present application, the polarizing layer is formed in steps, i.e. the silane coupling agent layer 111 is first formed on the glass substrate, and then the iodine molecule and / or dye molecule layer 112 is formed, so that the silane coupling agent and the glass substrate can have a strong chemical bonding effect, and the iodine molecule and / or dye molecule can be stably attached to the silane coupling agent layer 111, so that the polarizing layer 11 formed has good adhesion stability.

[0064] In the preparation of the polarizing layer 11, if the silane coupling agent solution is mixed with the iodine molecule solution and / or dye molecule solution first, and then the silane coupling agent reacts with the iodine molecule and / or dye molecule, and then the mixture after the reaction is coated on the glass substrate, the by-product HI (hydroiodic acid) generated by the reaction of the silane coupling agent with the iodine molecule and / or dye molecule is a strong acid. On the one hand, the strong acidic environment can catalyze the self-condensation of siloxane (-Si-OR), and the molecules will preferentially connect with each other to form oligomers or particles, rather than react with the hydroxyl groups on the surface of the glass substrate individually and orderly, which can result in the formation of a layer of physically adsorbed and not firm precipitate, rather than a firm chemical bonding layer. On the other hand, in the strong acidic environment, the amino group in the silane coupling agent will become a quaternary ammonium salt (R'—NH 3+ ), so that the whole molecule has a positive charge, which can strongly affect the behavior of the molecule in the solution and the adsorption and arrangement of the molecule on the surface of the glass substrate with a negative charge, and can destroy the film forming quality, so that the combination with the glass substrate becomes very poor, the film layer is unstable, the coupling efficiency decreases sharply, and the adhesion stability is poor.

[0065] Please refer to Figure 3 In some other embodiments, the step S20 comprises the following steps:

[0066] In step S20c, the silane coupling agent solution is mixed with the iodine molecule solution and / or dye molecule solution to obtain a mixed solution.

[0067] In step S20d, the mixed solution is coated on one surface of the substrate 2, and after heat treatment, the polarizing layer 11 is formed.

[0068] The embodiment is different from the above-mentioned embodiments in that the silane coupling agent solution is directly mixed with the iodine molecule solution and / or dye molecule solution first, and then the polarizing layer 11 is prepared by one-step coating method, so that the polarizing layer 11 has good adhesion stability, and the operation is relatively simple.

[0069] In the optional embodiment of the present application, the temperature of the heat treatment is 40-80°C (such as 40°C, 50°C, 60°C, 70°C, 80°C and any interval value between any two endpoint values), so that the solvent can be effectively removed and the reaction of the silane coupling agent with the surface of the glass substrate can be promoted.

[0070] It should be noted that in order to further strengthen the bonding of the silane coupling agent and the surface of the glass substrate, a curing process is further included after the heat treatment, and the specific operation can be: using ultraviolet irradiation, the active groups in the silane coupling agent are initiated to react by a photoinitiator to achieve curing.

[0071] In some embodiments, the concentration of the silane coupling agent solution is 0.1wt%-2wt% (such as 0.1wt%, 0.5wt%, 1wt%, 1.5wt%, 2wt% and interval values between any two endpoint values). Selecting a silane coupling agent solution with an appropriate concentration can facilitate its coating operation and facilitate the formation of a silane coupling agent layer 111 with good uniformity.

[0072] In some embodiments, the concentration of the iodine molecule solution is 0.1wt%-1.5wt% (such as 0.1wt%, 0.5wt%, 1wt%, 1.5wt% and interval values between any two endpoint values). Selecting an iodine molecule solution with an appropriate concentration can effectively ensure that the polarizer 1 has good polarization effect and facilitate its coating operation.

[0073] In some embodiments, the concentration of the dye molecule solution is 0.01wt%-2wt% (such as 0.01wt%, 0.1wt%, 0.5wt%, 1wt%, 2wt% and interval values between any two endpoint values). Selecting a dye molecule solution with an appropriate concentration can ensure that the polarizer 1 has good polarization effect, optical uniformity, transparency and color accuracy.

[0074] In some embodiments, the amount of iodine molecules and / or dye molecules accounts for 0.1%-5% of the mass of the silane coupling agent (such as 0.1%, 1%, 2%, 3%, 4%, 5% and interval values between any two endpoint values). This can effectively ensure the ordered arrangement of iodine molecules and / or dye molecules and achieve better polarization effect.

[0075] In some embodiments, the silane coupling agent includes at least one of an amino-based silane coupling agent, an epoxy-based silane coupling agent, and a vinyl-based silane coupling agent.

[0076] The amino-based silane coupling agent has the advantages of high reactivity and strong adhesion, and can be selected from γ-aminopropyl triethoxysilane (KH-550) and N-(β-aminoethyl)-γ-aminopropyl methyl dimethoxysilane (KH-602). The glass substrate treated by the amino-based silane coupling agent has high transmittance.

[0077] The epoxy-based silane coupling agent has the advantages of high reactivity and strong adhesion, and can be selected from γ-glycidyl ether propyl trimethoxysilane (KH-560). The glass substrate treated by the epoxy-based silane coupling agent has high transmittance.

[0078] The vinyl silane coupling agent has both hydrolyzable alkoxy groups (such as ethoxy group, methoxy group, etc.) and vinyl groups in the molecular structure. The alkoxy groups can react with the hydroxyl groups on the surface of inorganic materials to form stable chemical bonds, thereby realizing the combination with inorganic materials; and the vinyl groups can chemically react (such as copolymerization, etc.) with the unsaturated bonds in organic polymers, thereby playing a role of "bridge" between inorganic materials and organic materials and enhancing the combination and compatibility between the two. The vinyl triethoxysilane (KH-151 or A-151) can be selected. The glass substrate treated by the vinyl silane coupling agent has a high transmittance.

[0079] In some embodiments, the thickness of the polarizing layer 11 is 4 μm-60 μm (such as 4 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm and interval values between any two endpoint values). The polarizing layer 11 with the above thickness range can ensure that the polarizing sheet 1 has good flexibility and optical performance while realizing the polarizing function.

[0080] Compared with the conventional PVA polarizing layer 11 (usually having a thickness of 10 μm-80 μm), the thickness of the polarizing layer 11 of the present application is slightly reduced, thereby reducing the overall thickness of the polarizing sheet 1 and the overall thickness size of the display panel.

[0081] Please refer again to Figure 1 In some embodiments, the step S20 is followed by:

[0082] Step S30, preparing the sensing film 13 on the surface of the polarizing layer 11.

[0083] The sensing film 13 can sense the intensity, wavelength, polarization direction and other characteristics of light. The sensing film 13 is usually located on the outer layer of the structure of the polarizing sheet 1, close to the light source or the side of the user, which is beneficial for the sensing film 13 to directly contact and perceive the external light signal or other physical field signal. The structure of the sensing film 13 is composed of materials with photoelectric sensing or electromagnetic sensing characteristics, which include but are not limited to organic photoelectric materials (such as certain conjugated polymers) or inorganic semiconductor materials (such as zinc oxide, cadmium sulfide, etc.). These materials exist in the form of thin films and are deposited or coated on the polarizing layer 11 by physical or chemical methods. For example, the photoelectric sensing material is prepared into a thin film by chemical vapor deposition (CVD) or solution spin coating method, so as to be closely combined with other film layers of the polarizing sheet 1. The thickness of the sensing film 13 can be selected to be 10 μm-80 μm (such as 10 μm, 20 μm, 50 μm, 60 μm, 80 μm and interval values between any two endpoint values).

[0084] Step S40, preparing the release film 14 on the surface of the sensing film 13.

[0085] The release film 14 is a film with a low surface energy coating on the surface, which mainly plays a role in protecting the polarizing sheet 1, preventing it from being scratched during storage and transportation, and facilitating the peeling of the polarizing sheet 1 in the subsequent processing process during the production and use of the polarizing sheet 1. The release film 14 can easily separate the polarizing sheet 1 from other materials without adversely affecting the performance of the polarizing sheet 1. The release film 14 can be selected as a polyester (PET) film, which has good mechanical properties such as high strength and high toughness, can withstand a certain amount of stretching and bending without breaking. It also has good chemical stability, resistance to acid and alkali and other chemical substances, and good optical properties such as high transparency and low haze, which will not affect the optical display effect of the polarizing sheet 1. The thickness of the PET film can be selected as 25-125μm (such as 25μm, 50μm, 75μm, 100μm, 125μm and any interval value between any two endpoint values).

[0086] It should be noted that, since the silane coupling agent is used in the polarization layer 11, the adhesion stability of the polarization layer 11 is strong, and there is no shrinkage of the polarization layer 11, so there is no need to set the transparent protective layer 12 to prevent the shrinkage of the film layer.

[0087] Please refer to Figure 4 In some embodiments, step S20 is followed by:

[0088] Step S21, a transparent protective layer 12 is prepared on the surface of the polarization layer 11.

[0089] Correspondingly, step S30 is specifically: step S30a, an induction film 13 is prepared on the surface of the transparent protective layer 12.

[0090] In this embodiment, the transparent protective layer 12 can be selected as a TAC (triacetyl cellulose) film, and the transparent protective layer 12 only plays a role in protecting the polarization layer 11. The induction film 13 is arranged on the TAC (triacetyl cellulose) film, and the high light transmittance and good physical and chemical stability of the TAC film provide a stable support platform for the induction film 13; at the same time, the induction film 13 also provides some additional functions for the TAC film, such as optimizing the transmission and processing of optical signals inside the polarizing sheet 1 through optical coupling with the TAC film.

[0091] Compared with the conventional polarizing sheet 1 structure, the polarizing sheet 1 structure of the embodiment of the application saves one layer of TAC film and PVA film, and the structure is simpler and the manufacturing process is more simplified.

[0092] The application also provides a polarizing sheet 1 prepared by the above-mentioned method.

[0093] Please refer to Figure 5In some embodiments, the polarizing sheet 1 structure of the present application comprises a polarizing layer 11, a TAC film, a sensing film 13 and a release film 14 which are sequentially stacked, and the polarizing layer 11 is arranged on the substrate 2.

[0094] In some embodiments, the polarizing layer 11 comprises a silane coupling agent layer 111, an iodine molecule and / or a dye molecule layer, wherein the silane coupling agent layer is chemically bonded to the substrate. The polarizing sheet 1 of the present application is chemically bonded to the substrate 2 through the silane coupling agent layer 111, and has good adhesion stability, and does not need to be fixed on the substrate 2 by adhesive means. Therefore, when the polarizing sheet 1 of the present application is applied to a display panel, the overall transmittance of the display panel can be improved, and the power consumption of the display device can be reduced.

[0095] The present application also provides a display panel comprising the polarizing sheet 1, and the specific structure of the polarizing sheet 1 is described in the above embodiments. Since the display panel adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0096] In some embodiments, the display panel is a liquid crystal display panel, i.e. an LCD display panel, and the LCD display panel comprises an upper polarizing sheet 1 and a lower polarizing sheet 1. The upper polarizing sheet 1 and / or the lower polarizing sheet 1 can be prepared by the preparation method of the polarizing sheet 1 of the above embodiments. When the substrate 2 is a CF substrate (i.e. a glass substrate) in the display panel, the upper polarizing sheet 1 can be prepared; when the substrate 2 is a TFT substrate (i.e. a glass substrate) in the display panel, the lower polarizing sheet 1 can be prepared.

[0097] Please refer to Figure 6In some embodiments, the upper polarizer 1 is directly prepared on one side surface (i.e. the back surface) of the glass substrate 21, and the upper polarizer 1 comprises a polarization layer 11, a transparent protective layer 12, a sensing film 13 and a release film 14 which are sequentially stacked. On the other side surface (i.e. the front surface) of the glass substrate 21, a black matrix 22, a color filter film layer 23, an organic cover layer 24 and an alignment layer 3 are sequentially prepared, wherein the glass substrate 21, the black matrix 22, the color filter film layer 23 and the organic cover layer 24 collectively constitute a CF substrate 2a of a liquid crystal display panel, the black matrix 22 is used to separate each pixel and prevent color crosstalk between adjacent pixels, and can also block external light interference to improve display contrast. The color filter film layer 23 is composed of red (R), green (G) and blue (B) pixels; by controlling the brightness of different color pixels, the display of a color image is realized. The organic cover layer 24, i.e. the OC layer, is used to protect the color filter film layer 23; the alignment layer 3 can be a PI (polyimide) layer, which is used to arrange the liquid crystal molecules in the liquid crystal layer, and the PI layer has good physical and chemical compatibility with the liquid crystal material, can be in close contact with the liquid crystal molecules, and will not react with the liquid crystal molecules to affect the performance of the liquid crystal molecules.

[0098] Of course, when the lower polarizer 1 is prepared, the polarizer 1 can be directly prepared on the back surface of the TFT back plate, and the specific preparation operation can refer to the above-mentioned embodiments, which will not be repeated here.

[0099] It has been verified that the overall transmittance of the polarizer 1 combined with the glass substrate prepared by the present application reaches more than 65%, while the overall transmittance of the conventional polarizer 1 fixed by adhesive is only about 50%, so that the transmittance of the display panel using the polarizer 1 of the present application is relatively high, and the user's visual experience is relatively good.

[0100] After the overall transmittance of the display panel is improved, the contrast and color display accuracy are improved, and then the display quality is improved. At the same time, when the same brightness of light is emitted, the required voltage is smaller, and the power consumption is reduced. In addition, after the overall transmittance of the display panel is improved, the quality requirements of other components related to transmittance can be appropriately lowered, such as the backlight component which does not need to be high in requirements, high in quality and high in brightness.

[0101] The present application also provides a display device comprising a display panel, and the specific structure of the display panel refers to the above-mentioned embodiments. Since the display device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0102] In an optional embodiment, the display panel is a liquid crystal display panel, and the display device is a liquid crystal display device. Since the display panel adopts the polarizing plate, the overall transmittance of the display panel is high, and the power consumption of the liquid crystal display device is relatively low. Meanwhile, the contrast, color display accuracy and display quality of the liquid crystal display device are improved.

[0103] The above merely illustrates the embodiments of the present application, but does not limit the patent scope of the present application. Any equivalent structure transformation based on the technical concept of the present application, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A method for producing a polarizing plate, characterized by, The method comprises the following steps: providing a substrate; preparing a polarizing layer on a surface of the substrate by using a silane coupling agent, iodine molecules and / or dye molecules.

2. The method of producing a polarizing plate according to claim 1, wherein The step of preparing the polarizing layer on the surface of the substrate by using the silane coupling agent, the iodine molecules and / or the dye molecules comprises: applying a silane coupling agent solution on a surface of the substrate, and forming a silane coupling agent layer after heat treatment; applying an iodine molecule solution and / or a dye molecule solution on a surface of the silane coupling agent layer, and forming an iodine molecule layer and / or a dye molecule layer, wherein the silane coupling agent layer and the iodine molecule layer and / or the dye molecule layer together form the polarizing layer.

3. The method of producing a polarizing plate according to claim 1, wherein The step of preparing the polarizing layer on the surface of the substrate by using the silane coupling agent, the iodine molecules and / or the dye molecules comprises: mixing a silane coupling agent solution, an iodine molecule solution and / or a dye molecule solution to obtain a mixed solution; applying the mixed solution on a surface of the substrate, and forming the polarizing layer after heat treatment.

4. The method of producing a polarizing plate according to claim 2 or 3, wherein The temperature of the heat treatment is 40-80°C; and / or, The concentration of the silane coupling agent solution is 0.1-2wt%; and / or, The concentration of the iodine molecule solution is 0.1-1.5wt%; and / or, The concentration of the dye molecule solution is 0.01-2wt%.

5. The method of producing a polarizing plate according to claim 1, wherein The amount of the iodine molecules and / or the dye molecules accounts for 0.1-5% of the mass of the silane coupling agent; and / or, The silane coupling agent comprises at least one of an amino-based silane coupling agent, an epoxy-based silane coupling agent and a vinyl-based silane coupling agent.

6. The method of producing a polarizing plate according to claim 1, wherein The thickness of the polarizing layer is 4-60μm.

7. The method of producing a polarizing plate according to any one of claims 1 to 6, wherein The step of preparing the polarizing layer on the surface of the substrate by using the silane coupling agent, the iodine molecules and / or the dye molecules further comprises: preparing a sensing film on a surface of the polarizing layer; preparing a release film on a surface of the sensing film.

8. A polarizing sheet characterized by comprising: The polarizing sheet comprises a substrate, a silane coupling agent layer arranged on the substrate, and an iodine molecule layer and / or a dye molecule layer arranged on the silane coupling agent layer, wherein the silane coupling agent layer is chemically bonded to the substrate.

9. A display panel, characterized by, The display panel comprises the polarizing sheet of claim 8.

10. A display device, characterized by comprising: The display device comprises the display panel of claim 9.

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