Display substrate with polarizing film layer structure and preparation method thereof

Abstract

The invention discloses a preparation method of a display substrate with a polarizing film layer structure. The preparation method comprises the following steps: S1, pretreating the surface of the substrate; s2, forming a bonding layer on the pretreated substrate: dissolving a polymer binder in a solvent to prepare a binder solution, and spraying the binder solution on the surface of the substrate; s3, forming a polarization functional layer on the bonding layer: dissolving a film forming polymer and dichroic dye to prepare a polarization solution, spraying the polarization solution on the bonding layer, and applying an orientation field in the film forming process to enable the dichroic dye to be directionally arranged; and S4, forming a protective layer on the polarized functional layer: dissolving a protective material to prepare a protective solution, spraying the protective solution on the surface of the polarized functional layer, and curing. According to the preparation method of the display substrate with the polarizing film layer structure, the polarizer film layer structure is formed by directly spraying on the surface of the substrate, double breakthrough of process simplification and performance optimization is achieved, the light and thin degree is improved, the adhesive force between the film layers is high, and good durability is achieved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more particularly, to a display substrate having a polarizing film layer structure and a preparation method thereof. Background Art

[0002] As a core component of display devices such as liquid crystal displays (LCDs) and organic light-emitting diodes (OLEDs), polarizers convert natural light into polarized light, thereby improving display contrast and color performance by controlling the direction of light transmission.

[0003] The manufacturing and application of traditional polarizers mainly rely on the following process: a polarizing layer is formed by stretching a polyvinyl alcohol (PVA) film and dyeing it with a dichroic dye (such as iodine), which is then compounded with a triacetyl cellulose (TAC) protective film to form an independent polarizer. The independent polarizer is then bonded to the display glass substrate through optical adhesive (OCA). The traditional process has the following defects. First, independent polarizers require multiple steps (stretching, dyeing, compounding, and cutting), and the yield is limited by the uniformity of mechanical stretching (usually only 80% to 90%). Second, the bonding process requires high-precision alignment and is prone to defects (such as bright spots and rainbow patterns) due to environmental dust or bubbles in the adhesive layer, increasing the defective rate by 5% to 10%. In addition, the total thickness of traditional polarizers is about 100 to 200μm (including the TAC protective layer). After superimposing the OCA adhesive layer, the thickness of the display module is further increased, hindering the development of lightweight and thin devices.

[0004] For example, Chinese patent application (202110774253.4) discloses a method for laminating polarizers and a display thereof, comprising the following steps: cutting the original polarizer into a pre-cut polarizer in a shape and size similar to and larger than the liquid crystal panel, so that the size of the pre-cut polarizer is larger than the shape and size of the liquid crystal panel. The pre-cut polarizer is adhered to the surface of the liquid crystal panel in a direction corresponding to the shape of the liquid crystal panel, so that each edge of the pre-cut polarizer is larger than the edge of the liquid crystal panel. Although the pre-cut lamination solution proposed in this patent application attempts to improve the alignment accuracy, it still requires independent polarizer preparation and secondary processing, which is inefficient and cannot solve the interface defect problem.

[0005] In view of the above problems, it is urgent to propose a display substrate with a polarizing film layer structure and a preparation method thereof to provide a new process path for ultra-thin display devices. Summary of the Invention

[0006] Based on this, it is necessary to provide a display substrate with a polarizing film layer structure and a preparation method thereof to address the above technical problems.

[0007] In order to solve the above technical problems, the first aspect of the present invention proposes a method for preparing a display substrate with a polarizing film layer structure, comprising the following steps: S1, pretreatment of the substrate surface; S2, forming an adhesive layer on the pretreated substrate: dissolving a polymer adhesive in a solvent to prepare an adhesive solution, and spraying it on the substrate surface; S3, forming a polarizing functional layer on the adhesive layer: dissolving a film-forming polymer and a dichroic dye to prepare a polarizing solution, spraying it on the adhesive layer, and applying an orientation field during the film formation process to orient the dichroic dye; S4, forming a protective layer on the polarizing functional layer: dissolving a protective material to prepare a protective solution, spraying it on the surface of the polarizing functional layer and then curing it.

[0008] Furthermore, the orientation field is an electric field orientation with an electric field strength of 5 to 15 kV / cm and an inter-electrode spacing of

[0009] 10cm.

[0010] Furthermore, the orientation field is a magnetic field orientation, and the magnetic field intensity is 0.1 to 1.0T.

[0011] Furthermore, the substrate surface pretreatment includes surface cleaning treatment and surface hydrophilization treatment, and the surface hydrophilization treatment adopts plasma treatment or chemical reagent treatment.

[0012] Furthermore, the polymer adhesive is an acrylic adhesive, a polyurethane adhesive or an epoxy resin adhesive, and the concentration of the adhesive solution is 10 to 20 wt%.

[0013] Furthermore, the dichroic dye is an iodine dye, an azo dye or an anthraquinone dye.

[0014] Furthermore, the film-forming polymer is polyvinyl alcohol, the concentration of the polyvinyl alcohol in the polarizing solution is 5-10 wt %, and the concentration of the dichroic dye in the polarizing solution is 0.5-2 wt %.

[0015] Furthermore, the protective material is an organic silicone resin, and the concentration of the organic silicone resin in the protective solution is 15 to 25 wt%.

[0016] Furthermore, S2 forms an adhesive layer with a thickness of 0.5 to 2 μm on the pretreated substrate; S3 forms a polarizing functional layer with a thickness of 2 to 5 μm on the adhesive layer; and S4 forms a protective layer with a thickness of 1 to 3 μm on the polarizing functional layer.

[0017] A second aspect of the present invention provides a display substrate with a polarizing film layer structure, which is manufactured by any of the above methods. The display substrate with a polarizing film layer structure comprises, from bottom to top: a display glass substrate, an adhesive layer, a polarizing functional layer, and a protective layer.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a method for preparing a display substrate with a polarizing film structure, which realizes a dual breakthrough of process simplification and performance optimization by directly spraying the polarizer film structure on the substrate surface. The method provided by the present invention abandons the traditional polarizer lamination process, and constructs the adhesive layer (0.5-2μm), polarizing functional layer (2-5μm containing orientation dye) and silicone protective layer (1-3μm) in sequence through precise control of the spraying technology. It not only completely eliminates defects such as lamination bubbles and dust, but also compresses the overall film thickness to less than 10μm, so that the display module is more than 40% lighter and thinner, which is conducive to the miniaturization and portability of display devices. By adopting the in-situ orientation technology of electric field or magnetic field, the order of arrangement of dichroic dye molecules reaches more than 90%, and with the optimized PVA-dye formula system, the polarization degree of the polarizer finally obtained exceeds 90%, and the transmittance in the 400-700nm band exceeds 42%. It has good polarization performance, excellent optical performance, clear display effect, strong adhesion between the film layers, and good durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 : A schematic structural diagram of a display substrate having a polarizing film layer structure according to Example 1 of the present invention.

[0022] Reference numerals:

[0023] Display glass substrate 1, adhesive layer 2, polarizing functional layer 3, and protective layer 4. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0026] Example 1

[0027] like Figure 1 As shown, the display substrate with a polarizing film structure provided in this embodiment comprises, from bottom to top, a display glass substrate 1, an adhesive layer 2, a polarizing functional layer 3, and a protective layer 4, wherein the thickness of the display glass substrate 1 is 0.5 to 1.1 mm;

[0028] The thickness of the bonding layer 2 is 0.5 to 2 μm, and the material of the bonding layer 2 is an acrylic adhesive, a polyurethane adhesive, or an epoxy resin adhesive as a film-forming material, wherein the acrylic adhesive includes but is not limited to: methyl methacrylate copolymer, butyl acrylate-acrylic acid copolymer, and hydroxyethyl acrylate modified resin, and the polyurethane adhesive includes but is not limited to: hexamethylene diisocyanate, isophorone diisocyanate, toluene diisocyanate, and hydrogenated epoxy resin;

[0029] The thickness of the polarizing functional layer 3 is 2 to 5 μm;

[0030] The thickness of the protective layer 4 is 1-3 μm, and the material of the protective layer 4 is silicone resin.

[0031] Example 2

[0032] This embodiment provides a method for preparing a display substrate having a polarizing film structure, which includes the following steps:

[0033] S1. Substrate pretreatment:

[0034] 1.1 Surface Cleaning: Place the display glass substrate to be treated in an ultrasonic cleaning tank and perform step-by-step cleaning using deionized water and an organic solvent. The organic solvent is preferably anhydrous ethanol. The ultrasonic cleaning frequency is controlled within the range of 40kHz. The treatment time for each cleaning stage is controlled within 10 minutes. The cleaning temperature is maintained at 25±5°C.

[0035] 1.2 Surface hydrophilization treatment: The surface of the cleaned substrate is hydrophilized by plasma treatment. The specific treatment conditions are as follows: treatment power 300-500W, treatment time 3-10 minutes, working gas is argon, and chamber pressure is 50-100Pa. The hydrophilization treatment improves the adhesion between the surface of the display glass substrate and the subsequent spraying material.

[0036] S2. Preparation of bonding layer

[0037] 2.1 Preparing a binder solution: Select an acrylate binder as a film-forming material. The acrylate binder includes but is not limited to methyl methacrylate copolymer, butyl acrylate-acrylic acid copolymer, and hydroxyethyl acrylate modified resin. Dissolve the binder in an organic solvent selected from acetone, ethyl acetate, xylene, or a mixture thereof. In this embodiment, the acrylate binder is methyl methacrylate copolymer and the organic solvent is acetone. Prepare a 10 wt % binder solution and stir at 25-30° C. for 1-2 hours until completely dissolved.

[0038] 2.2 Spraying Implementation: Use high-pressure airless spraying equipment to spray the solution prepared in 2.1 onto the display glass substrate. The spraying equipment is set to the following parameters: spraying pressure 0.2 MPa, spraying distance 10 cm, nozzle diameter 0.3 mm; film thickness 0.5 μm.

[0039] 2.3 Curing treatment: Place the sprayed substrate in a circulating hot air oven and cure it at 60°C for 20 minutes.

[0040] S3. Preparation of polarizing functional layer

[0041] 3.1 Solution Preparation: Polyvinyl alcohol (PVA) and a dichroic dye are added to deionized water and stirred at 60-80°C for 2-4 hours until completely dissolved to prepare a polarizing solution, wherein the polymer concentration is 5 wt % and the dichroic dye concentration is 0.5 wt %. The dichroic dye is selected from iodine dyes, azo dyes, anthraquinone dyes, or a combination thereof. In this embodiment, the dichroic dye is iodine.

[0042] 3.2 Spraying implementation: Use high-voltage electrostatic spraying equipment to spray the solution prepared in 3.1 onto the bonding layer. The spraying parameters are set as spraying pressure 0.3 MPa, spraying distance 15 cm, nozzle diameter 0.2 mm, and the thickness of the polarizing functional layer is controlled at 2 μm.

[0043] 3.3 Molecular orientation control: During the spraying process, an orientation field is applied synchronously. The orientation field is an electric field orientation, wherein the electric field strength is 5 kV / cm and the inter-electrode distance is 10 cm.

[0044] S4. Preparation of protective layer

[0045] 4.1 Preparation of Protective Solution The organosilicon resin is dissolved in an organic solvent to prepare a transparent protective solution with a concentration of 15 wt %. In this embodiment, the organosilicon resin is preferably methylphenylsiloxane resin, and the organic solvent is selected from xylene.

[0046] 4.2 Spraying Implementation: Use precision spraying equipment to spray the solution prepared in 4.1 onto the polarizing functional layer. The spraying equipment parameters are set as follows: spraying pressure 0.2 MPa, spraying distance 12 cm, and protective layer thickness 1 μm.

[0047] 4.3 Step curing treatment: In the first stage, the temperature is raised to 80°C at 5°C / min and kept warm for 10 minutes; in the second stage, the temperature is further raised to 100°C and kept warm for 20 to 30 minutes.

[0048] Example 3

[0049] This embodiment provides a method for preparing a display substrate having a polarizing film structure, which includes the following steps:

[0050] S1. Substrate pretreatment:

[0051] 1.1 Surface Cleaning: Place the display glass substrate to be treated in an ultrasonic cleaning tank and perform step-by-step cleaning using deionized water and an organic solvent. The organic solvent is preferably isopropyl alcohol. The ultrasonic cleaning frequency is controlled within the range of 60 kHz. The treatment time for each cleaning stage is controlled within 30 minutes. The cleaning temperature is maintained at 25 ± 5°C.

[0052] 1.2 Surface hydrophilization treatment: the steps are the same as those in Example 2.

[0053] S2. Preparation of bonding layer

[0054] 2.1 Prepare a binder solution: Select an acrylate binder as the film-forming material and dissolve the binder in an organic solvent. In this embodiment, the acrylate binder is a hydroxyethyl acrylate modified resin and the organic solvent is xylene. Prepare a binder solution with a concentration of 15 wt % and stir at 25-30° C. for 1-2 hours until the binder is completely dissolved.

[0055] 2.2 Spraying Implementation: Use high-pressure airless spraying equipment to spray the solution prepared in 2.1 onto the display glass substrate. The spraying equipment is set to the following parameters: spraying pressure 0.3 MPa, spraying distance 15 cm, nozzle diameter 0.4 mm; film thickness 1 μm.

[0056] 2.3 Curing treatment: Place the sprayed substrate in a circulating hot air oven and cure it at 70°C for 15 minutes.

[0057] S3. Preparation of polarizing functional layer

[0058] 3.1 Solution Preparation: Polyvinyl alcohol (PVA) and a dichroic dye are added to deionized water and stirred at 60-80°C for 2-4 hours until completely dissolved to prepare a polarizing solution, wherein the polymer concentration is 8 wt % and the dichroic dye concentration is 1 wt %. In this embodiment, the dichroic dye is cadmium diiodide bromide.

[0059] 3.2 Spraying implementation: Use high-voltage electrostatic spraying equipment to spray the solution prepared in 3.1 onto the bonding layer. The spraying parameters are set as spraying pressure 0.5 MPa, spraying distance 20 cm, nozzle diameter 0.3 mm, and polarizing functional layer thickness 3 μm.

[0060] 3.3 Molecular orientation control: During the spraying process, an orientation field is applied synchronously. The orientation field is an electric field orientation, wherein the electric field strength is 15 kV / cm and the inter-electrode distance is 10 cm.

[0061] S4. Preparation of protective layer

[0062] 4.1 Preparation of Protective Solution The organosilicon resin is dissolved in an organic solvent to prepare a transparent protective solution with a concentration of 20 wt %. In this embodiment, the organosilicon resin is preferably phenyl silicone resin, and the organic solvent is selected from cyclohexanone.

[0063] 4.2 Spraying Implementation: Use precision spraying equipment to spray the solution prepared in 4.1 onto the polarizing functional layer. The spraying equipment parameters are set as follows: spraying pressure 0.3 MPa, spraying distance 15 cm, and protective layer thickness 2 μm.

[0064] 4.3 Step curing treatment: the steps are the same as those in Example 2.

[0065] Example 4

[0066] This embodiment provides a method for preparing a display substrate having a polarizing film structure, which includes the following steps:

[0067] S1. Substrate pretreatment:

[0068] 1.1 Surface cleaning: the steps are the same as those in Example 2;

[0069] 1.2 Surface hydrophilization treatment: The surface of the cleaned substrate is hydrophilized. The hydrophilization modification is carried out by chemical treatment. The cleaned display glass substrate is immersed in a sodium hydroxide aqueous solution with a concentration of 5% to 15wt% for 1 to 5 minutes. In this embodiment, the sodium hydroxide aqueous solution is 10wt% and the immersion time is 3 minutes.

[0070] S2. Preparation of bonding layer

[0071] 2.1 Prepare a binder solution: Select an acrylate binder as the film-forming material and dissolve the binder in an organic solvent. In this embodiment, the acrylate binder is butyl acrylate-acrylic acid copolymer, and the organic solvent is ethyl acetate. Prepare a binder solution with a concentration of 20 wt %, and stir at 25-30° C. for 1-2 hours until the binder is completely dissolved.

[0072] 2.2 Spraying Implementation: Use high-pressure airless spraying equipment to spray the solution prepared in 2.1 onto the display glass substrate. The spraying equipment is set to the following parameters: spraying pressure 0.5 MPa, spraying distance 20 cm, nozzle diameter 0.5 mm, moving speed 40 cm / s; the bonding layer thickness is 2 μm.

[0073] 2.3 Curing treatment: Place the sprayed substrate in a circulating hot air oven and cure it at 80°C for 20 minutes.

[0074] S3. Preparation of polarizing functional layer

[0075] 3.1 Solution Preparation: Polyvinyl alcohol (PVA) and a dichroic dye are added to deionized water and stirred at 60-80°C for 2-4 hours until completely dissolved to prepare a polarizing solution, wherein the polymer concentration is 10 wt % and the dichroic dye concentration is 2 wt %. In this embodiment, the dichroic dye is the azo dye Congo Red.

[0076] 3.2 Spraying implementation: Use high-voltage electrostatic spraying equipment to spray the solution prepared in 3.1 onto the bonding layer. The spraying parameters are set as spraying pressure 0.6 MPa, spraying distance 25 cm, nozzle diameter 0.5 mm, and polarizing functional layer thickness 5 μm.

[0077] 3.3 Molecular orientation control: During the spraying process, an orientation field is applied synchronously. The orientation field is a magnetic field orientation, wherein the magnetic field strength is 0.1 to 1.0 T and the magnetic pole is parallel to the substrate surface. Preferably, the magnetic field strength in this embodiment is 0.5 T.

[0078] S4. Preparation of protective layer

[0079] 4.1 Preparation of Protective Solution The organosilicon resin is dissolved in an organic solvent to prepare a transparent protective solution with a concentration of 25 wt %. In this embodiment, the organosilicon resin is preferably an acrylic acid-modified organosilicon resin, and the organic solvent is selected from butyl acetate.

[0080] 4.2 Spraying implementation: Use precision spraying equipment to spray the solution prepared in 4.1 onto the polarizing functional layer. The spraying equipment parameters are set as follows: spraying pressure 0.4 MPa, spraying distance 20 cm, spray gun moving speed 30 cm / s, and thickness controlled at 3 μm.

[0081] 4.3 Step curing treatment: the steps are the same as those in Example 2.

[0082] Example 5

[0083] This embodiment provides a method for preparing a display substrate having a polarizing film structure. The only difference between this method and embodiment 2 is that, in step S2, step 2.1 is to prepare a binder solution: a polyurethane binder is selected as a film-forming material, the polyurethane binder including but not limited to hexamethylene diisocyanate, isophorone diisocyanate, toluene diisocyanate, and hydrogenated epoxy resin, and the binder is dissolved in an organic solvent selected from acetone, ethyl acetate, xylene, or a mixed solvent thereof; in this embodiment, the polyurethane binder is hexamethylene diisocyanate, and the organic solvent is ethyl acetate; a binder solution with a concentration of 20 wt% is prepared, and the binder solution is stirred at 25-30° C. for 1-2 hours until it is completely dissolved.

[0084] Example 6

[0085] This embodiment provides a method for preparing a display substrate having a polarizing film structure, which differs from Embodiment 2 only in that, in step S2, step 2.1 comprises preparing a binder solution: selecting an epoxy resin binder as a film-forming material, wherein the epoxy resin binder includes, but is not limited to, bisphenol A epoxy resin, hydrogenated bisphenol A epoxy resin, silicone-modified epoxy resin, and polyurethane-modified epoxy resin; dissolving the binder in an organic solvent selected from acetone, ethyl acetate, xylene, or a mixture thereof; wherein, in this embodiment, the epoxy resin binder is bisphenol A epoxy resin, and the organic solvent is ethyl acetate; preparing a binder solution with a concentration of 20 wt %, and stirring the solution at 25-30° C. for 1-2 hours until the binder is completely dissolved.

[0086] Comparative Example 1

[0087] This comparative example provides a method for preparing a display substrate having a polarizing film layer structure. The difference between this method and Example 2 is that step S2 is omitted, no adhesive layer is provided, and the polarizing functional layer is directly sprayed onto the display glass substrate.

[0088] Comparative Example 2

[0089] This comparative example provides a method for preparing a display substrate having a polarizing film structure. The difference between the comparative example and Example 2 is that step S4 is omitted and no protective layer is provided.

[0090] Comparative Example 3

[0091] This comparative example provides a method for preparing a display substrate having a polarizing film layer structure. The method differs from Example 2 in that steps S2 and S4 are omitted, and no adhesive layer and protective layer are provided.

[0092] Test Example 1

[0093] This test example verifies the influence of the optical properties of the display substrates having a polarizing film layer structure prepared in Examples 2 to 6 and Comparative Examples 1 to 3. Specifically, a spectrophotometer (JASCO V-770) is used to measure the average transmittance in the visible light region (400 to 700 nm) and the orthogonal polarization contrast (ratio of the transmittance at 0° to 90°). The results are shown in Table 1 below.

[0094] Table 1: Optical properties of display substrates with polarizing film structures prepared in Examples 2 to 6 and Comparative Examples 1 to 3

[0095]

[0096] Analysis of the results: Example 3 (30:1 contrast) has a polarization degree of 93.5% due to the high dye concentration (1% diiodinated cadmium bromide) and strong electric field, which is close to commercial polarizers (>95%). Examples 2 to 6 have a transmittance of 42 to 44%, which is slightly lower than Comparative Examples 1 and 3 (without polarizing functional layer), but the polarization contrast is improved by 3 to 10 times; Comparative Example 1 does not have a bonding layer: due to poor interface bonding, the orientation of the dye molecules is disordered, and the polarization degree is only 66.7%; Comparative Example 3 has no bonding layer and no protective layer, so although the transmittance is the highest (55.1%), the polarization contrast is the lowest (3:1), and it has no practical value; Example 4 uses an azo dye (Congo red) to achieve a significant orientation effect under a 0.5T magnetic field, proving the feasibility of non-iodine dyes; Comparing Example 2 with Comparative Example 2, the protective layer improves the wear resistance while the transmittance is only reduced by 1.3%.

[0097] Test Example 2

[0098] In this test example, the display substrates having a polarizing film structure according to Examples 2 to 6 and Comparative Examples 1 to 3 were subjected to adhesion and abrasion resistance tests, an adhesion peel test (heat aging conditions: 85°C / 85% RH, 500 h), adhesion retention rate = (strength after heat aging / strength before heat aging) × 100%, and an abrasion resistance test (4.9 N load, rubber friction head (wrapped with degreased cloth) reciprocating rubbing 50 times, and scratch observation).

[0099] Table 2: Adhesion and wear resistance test results of display substrates with polarizing film structures of Examples 2 to 6 and Comparative Examples 1 to 3

[0100]

[0101] The test results show that the peel strength of Examples 2 to 6 after thermal aging is all greater than 9N, and all pass the wear resistance test, with performance significantly better than the comparative examples; Comparative Example 1 (no bonding layer) and Comparative Example 3 (no bonding layer and protective layer) perform the worst; the adhesion retention rate of Examples 2 to 6 before and after thermal aging is around 98%, while that of Comparative Example 2 drops to 82% due to the lack of crosslinking; the lack of a bonding layer in Comparative Examples 1 and 3 causes the polarizing layer to fall off directly, proving that the bonding layer is indispensable; the peel strength of the uncrosslinked acrylate in Comparative Example 2 decreases by 18% after wet-heat aging, indicating unstable interfacial bonding.

[0102] Obviously, the embodiments described above are only some of the embodiments of the present application, rather than all of the embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present application specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present application.

Claims

1. A method for preparing a display substrate having a polarizing film structure, characterized in that: The following steps are involved: S1, substrate surface pretreatment; S2. forming an adhesive layer on the pretreated substrate: dissolving a polymer adhesive in a solvent to prepare an adhesive solution, and spraying the solution on the substrate surface; S3. forming a polarizing functional layer on the bonding layer: dissolving a film-forming polymer and a dichroic dye to prepare a polarizing solution, spraying the solution onto the bonding layer, and applying an orientation field during the film formation process to align the dichroic dye; S4. forming a protective layer on the polarizing functional layer: dissolving the protective material to prepare a protective solution, spraying the solution on the surface of the polarizing functional layer, and then curing the solution.

2. The method for preparing a display substrate having a polarizing film structure according to claim 1, wherein: The orientation field is electric field orientation, the electric field strength is 5-15 kV / cm, and the inter-electrode distance is 10 cm.

3. The method for preparing a display substrate having a polarizing film structure according to claim 1, wherein: The orientation field is a magnetic field orientation, and the magnetic field intensity is 0.1-1.0T.

4. The method for preparing a display substrate having a polarizing film structure according to claim 1, wherein: The substrate surface pretreatment includes surface cleaning treatment and surface hydrophilization treatment, and the surface hydrophilization treatment adopts plasma treatment or chemical reagent treatment.

5. The method for preparing a display substrate having a polarizing film structure according to claim 1, wherein: The polymer adhesive is an acrylic adhesive, a polyurethane adhesive or an epoxy resin adhesive, and the concentration of the adhesive solution is 10-20 wt%.

6. The method for preparing a display substrate having a polarizing film structure according to claim 5, wherein: The dichroic dye is an iodine dye, an azo dye or an anthraquinone dye.

7. The method for preparing a display substrate having a polarizing film structure according to claim 6, wherein: The film-forming polymer is polyvinyl alcohol, the concentration of the polyvinyl alcohol in the polarizing solution is 5-10 wt %, and the concentration of the dichroic dye in the polarizing solution is 0.5-2 wt %.

8. The method for preparing a display substrate having a polarizing film structure according to claim 7, wherein: The protective material is an organic silicon resin, and the concentration of the organic silicon resin in the protective solution is 15-25 wt %.

9. The method for preparing a display substrate having a polarizing film structure according to claim 8, wherein: S2 forms an adhesive layer with a thickness of 0.5 to 2 μm on the pretreated substrate; S3 forms a polarizing functional layer with a thickness of 2 to 5 μm on the adhesive layer; S4 forms a protective layer with a thickness of 1 to 3 μm on the polarizing functional layer.

10. A display substrate having a polarizing film structure, characterized in that: Made by any one of the methods of claims 1 to 9, the display substrate with a polarizing film layer structure comprises, from bottom to top: a display glass substrate (1), an adhesive layer (2), a polarizing functional layer (3) and a protective layer (4).

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