Preparation method of functional layer of dimming glass, functional layer and dimming glass

Abstract

The invention discloses a preparation method of a switchable glass functional layer, the functional layer and switchable glass, and belongs to the field of switchable glass. The preparation method comprises the following steps: 1, preparing a first dye liquid crystal box through a liquid crystal instillation box forming process; 2, thinning a first glass substrate and a second glass substrate of the first dye liquid crystal box until the thickness is less than or equal to 0.27 mm to obtain a second dye liquid crystal box; taking the second dye liquid crystal box as a substrate and carrying out a liquid crystal instillation box forming process on the second dye liquid crystal box and a third glass substrate to obtain a dimming glass functional layer; or taking the first dye liquid crystal box as a substrate and carrying out a liquid crystal instillation box forming process on the first dye liquid crystal box and a third glass substrate to obtain a third dye liquid crystal box; and thinning the first glass substrate and the third glass substrate on the outer side of the third dye liquid crystal box until the thickness is less than or equal to 0.27 mm to obtain a dimming glass functional layer. The total thickness of the manufactured dimming glass is smaller than or equal to 5 mm, and the thickness assembling requirements of a skylight and a side window of a vehicle are met.

Description

Technical Field

[0001] The present application relates to the technical field of dimming glass, and in particular to a preparation method of a dimming glass functional layer, a functional layer and a dimming glass. Background Art

[0002] At present, with the continuous improvement of people's living standards, people's requirements for the comfort of passenger cars are getting higher and higher, and the demand for the ability to adjust the light in passenger cars is gradually increasing. Generally, the light in the car is adjusted by using dimming glass on the sunroof and side windows of the passenger car, and the dimming glass is required to achieve a shading effect with a light transmittance of less than 1% in the dark state to ensure good privacy protection or shading needs, and a higher light transmittance in the bright state to provide a better field of view and lighting experience. At present, the only dimming glass that can achieve this high standard dimming requirement is the dimming glass with a dye liquid crystal functional layer. Furthermore, in order to achieve a wide adjustment range from extremely low transmittance to high transmittance, the dye liquid crystal functional layer of the dimming glass must be prepared using advanced double-box dimming functional layer stacking technology. This technology precisely stacks two or more layers of liquid crystal films containing specific dye liquid crystals, and uses the arrangement changes of dye liquid crystal molecules under different voltages to achieve precise control of light transmittance. This method not only meets the strict requirements of passenger cars for the performance of dimming glass, but also promotes further innovation and development of dimming glass in the automotive field.

[0003] The two liquid crystal boxes of the above-mentioned dual-box dimming function layer are both made of dye liquid crystals. The dimming function is achieved by driving the dye liquid crystals to rotate under different voltages. When the light absorption axis of the dye liquid crystals presents different angles with the direction of the light, the degree of light absorption of the dye liquid crystals is different, and the light transmittance is also different. Specifically, the dye liquid crystal is almost in a state perpendicular to the substrate when no voltage is applied. At this time, because the light absorption axis of the dye liquid crystals is parallel to the incident direction of the light, the light transmittance is the largest, which is characterized by a normally bright state. When voltage is applied, the dye liquid crystal begins to gradually shift from a state perpendicular to the substrate to a state parallel to the substrate. When light passes through the upper box, the dye liquid crystal in the upper box can effectively block the light parallel to the absorption axis of the dye liquid crystal, but the blocking of light perpendicular to the absorption axis of the dye liquid crystal is limited. This part of the light will pass through the upper box and enter the lower box. Because the PI orientations between the upper and lower boxes are perpendicular to each other, the polarization direction of the partial polarized light that is not blocked by the upper box is just parallel to the absorption axis of the dye liquid crystal in the lower box. In this way, the matching of the upper and lower double boxes can achieve a darker shading effect compared to a single dye liquid crystal box.

[0004] Although the double-box dimming functional layer can achieve a lower dark state, the structural design of the passenger car requires that the thickness of the sunroof and side windows are both less than 5mm. At present, the double-box dimming functional layer stacking technology requires that the dye liquid crystal functional layer be bonded with the tempered glass through PVB to form a laminated glass unit (English: Laminated Glass Unit, referred to as LGU) before it can be applied to the sunroof or side window. At present, the thinnest thickness of tempered glass is 1.6mm, and the thinnest thickness of PVB is 0.38mm. The glass thickness of the functional layer comprehensively considers the thinning process and the yield. At present, the thinnest thickness that can be prepared for a single piece of glass is 0.19mm. Since the box thickness of the functional layer is at the μm level, it is not considered. In summary, the thickness of the entire dimming glass is 1.6×2+0.38×3+0.19×4=5.1mm>5mm, which is too thick and does not meet the thickness assembly requirements of the vehicle sunroof and side windows. Summary of the invention

[0005] The embodiments of the present application provide a method for preparing a dimming glass functional layer, a functional layer and a dimming glass, which can solve the problem that the thickness of the existing dimming glass is too thick and does not meet the thickness assembly requirements of the vehicle sunroof and side windows.

[0006] In order to achieve the above object, the technical solution of the embodiment of the present invention is:

[0007] In a first aspect, an embodiment of the present invention provides a method for preparing a dimming glass functional layer, comprising:

[0008] Step 1: preparing a first dye liquid crystal cell by a liquid crystal drop-casting cell-forming process;

[0009] Step 2: thinning the first glass substrate and the second glass substrate of the first dye liquid crystal box to a thickness of less than or equal to 0.27 mm to obtain a second dye liquid crystal box; using the second dye liquid crystal box as a substrate and the third glass substrate to perform a liquid crystal drop forming process to obtain a dimming glass functional layer;

[0010] Alternatively, the first dye liquid crystal box is used as a substrate and a third glass substrate is subjected to a liquid crystal dripping process to obtain a third dye liquid crystal box; the first glass substrate and the third glass substrate outside the third dye liquid crystal box are thinned to a thickness of less than or equal to 0.27 mm to obtain a dimming glass functional layer.

[0011] In combination with the first aspect, in a possible implementation manner, the thinning method is HF acid chemical etching.

[0012] In combination with the first aspect, in a possible implementation, the first glass substrate and the second glass substrate are both thinned to a thickness of 0.19 mm;

[0013] And / or, the third glass substrate and the fourth glass substrate are both thinned to a thickness of 0.19 mm.

[0014] In a second aspect, another embodiment of the present invention provides a dimming glass functional layer, which is prepared by the above-mentioned preparation method of the dimming glass functional layer, including a first glass substrate, a first electrode layer, a first alignment layer, a first dye liquid crystal layer, a second alignment layer, a second electrode layer, a second glass substrate, a third electrode layer, a third alignment layer, a second dye liquid crystal layer, a fourth alignment layer, a fourth electrode layer and a third glass substrate arranged in sequence;

[0015] The first glass substrate and the second glass substrate are bonded to each other at their peripheries by a sealant;

[0016] The peripheries of the second glass substrate and the third glass substrate are bonded by a sealant;

[0017] The first dye liquid crystal layer and the second dye liquid crystal layer are oriented perpendicular to each other;

[0018] The thickness of the first glass substrate and the second glass substrate is both less than or equal to 0.27 mm, or the thickness of the first glass substrate and the third glass substrate is both less than or equal to 0.27 mm.

[0019] In combination with the second aspect, in a possible implementation manner, the thickness of the first glass substrate and the second glass substrate is 0.19 mm;

[0020] And / or, the first glass substrate and the third glass substrate are both thinned to a thickness of 0.19 mm.

[0021] In combination with the second aspect, in a possible implementation manner, the alignment angles of the first alignment layer and the second alignment layer are specific angles.

[0022] In a third aspect, another embodiment of the present invention provides a dimming glass, comprising the dimming glass functional layer described above.

[0023] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0024] The method for preparing the dimming glass functional layer provided in the embodiment of the present application first prepares a first dye liquid crystal box by a liquid crystal dripping box-forming process. Then, the first glass substrate and the second glass substrate of the first dye liquid crystal box are thinned to a thickness of less than or equal to 0.27 mm to obtain a second dye liquid crystal box. The second dye liquid crystal box is used as a substrate and a third glass substrate are subjected to a liquid crystal dripping box-forming process to obtain a dimming glass functional layer. Alternatively, the first dye liquid crystal box is used as a substrate and a third glass substrate are subjected to a liquid crystal dripping box-forming process to obtain a third dye liquid crystal box. The first glass substrate and the third glass substrate outside the third dye liquid crystal box are thinned to a thickness of less than or equal to 0.27 mm to obtain a dimming glass functional layer. The thickness of the dimming glass functional layer finally obtained is less than or equal to 1.04 mm. When the dimming glass functional layer of the embodiment of the present application is used to make dimming glass, the optical glass includes a first tempered glass (thickness of 1.6mm), a first adhesive layer (thickness of 0.38mm), a dimming glass functional layer (thickness of less than or equal to 1.04mm), a second adhesive layer (thickness of 0.38mm) and a second tempered glass (thickness of 1.6mm) arranged in sequence. The structural optimization is achieved by optimizing the preparation method. Compared with the functional layer of the existing dimming glass, there is one less adhesive layer, and the thickness of the dimming glass functional layer is reduced from four layers of glass substrate to three layers of glass substrate. Therefore, the total thickness of the manufactured dimming glass is less than or equal to 5mm, which meets the thickness assembly requirements of the vehicle sunroof and side windows. The two dye liquid crystal boxes formed by the dimming glass functional layer prepared by the preparation method of the embodiment of the present application are different from the existing two independent dye liquid crystal boxes superimposed, but are integrated together in the production process, which can effectively reduce the thickness of the middle layer of the glass substrate and improve the overall uniformity of the dimming glass functional layer. At the same time, because the middle glue layer is omitted, the process difficulty of the overall tempered glass assembly is simpler than the previous production process of using two independent dye liquid crystal boxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A flowchart of a method for preparing a dimming glass functional layer provided in an embodiment of the present application;

[0027] Figure 2 Schematic diagram of the structure of the dimming glass functional layer prepared by the preparation method provided in the embodiment of the present application Figure 1 ;

[0028] Figure 3A schematic diagram of a structure of a dimming glass functional layer prepared by a preparation method provided in an embodiment of the present application Figure 2 ;

[0029] Figure 4 A schematic diagram of the structure of the dimming glass provided in an embodiment of the present application;

[0030] Figure 5 A schematic diagram of the structure of dimming glass provided by the prior art.

[0031] Icon: A-first dye liquid crystal box; B-second dye liquid crystal box; C-third dye liquid crystal box; 1-first glass substrate; 2-first dye liquid crystal layer; 3-second glass substrate; 4-second dye liquid crystal layer; 5-third glass substrate; 6-sealant; 7-first tempered glass; 8-first glue layer; 9-second glue layer; 10-second tempered glass; 11-tempered glass; 12-dye liquid crystal box; 13-PVB glue layer. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In the relevant description of this embodiment, the terms "including, containing, having" and the like are open terms, and are generally understood to include but not limited to; the symbol "A / B" is used to describe the selection relationship of associated objects, generally indicating an "or" relationship before and after. In the following description of this embodiment, the terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms of "a" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0034] Those skilled in the art should understand that in the following description of the embodiments of the present application, the order of the sequence numbers does not mean the order of execution, some or all of the steps can be executed in parallel or in sequence, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. Unless otherwise specified, the technical / scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present application belongs.

[0035] At present, the dual-box dimming function layer superposition technology, such as Figure 5As shown, the dye liquid crystal functional layer needs to be bonded with the tempered glass 11 through the PVB adhesive layer 13 to form a laminated glass unit (English: Laminated Glazed Unit, abbreviated as LGU) before it can be applied to the skylight or side window. The structure of the laminated glass unit is the tempered glass 11, PVB adhesive layer 13, dye liquid crystal box 12 [including the glass substrate, electrode layer (thin, not shown in the figure), orientation layer (thin, not shown in the figure), dye liquid crystal layer, orientation layer (thin, not shown in the figure), electrode layer (thin, not shown in the figure) and glass substrate arranged in sequence], PVB adhesive layer 13, dye liquid crystal box 12 (same structure as above), PVB adhesive layer 13, tempered glass 11, and the outer periphery of the two layers of tempered glass 11 is bonded by sealant 6 (the sealant 6 can be PVB glue). The upper dye liquid crystal box 12 and the lower dye liquid crystal box 12 are separated and independent, and the long axis directions of the dye liquid crystals in the upper dye liquid crystal box 12 and the lower dye liquid crystal box 12 are perpendicular to each other.

[0036] At present, the thinnest thickness of the tempered glass 11 is 1.6mm, and the thinnest thickness of the PVB adhesive layer 13 is 0.38mm. The glass thickness of the functional layer takes into account the thinning process and the yield rate. At present, the thinnest thickness of the single-piece glass that can be prepared is 0.19mm. Since the box thickness of the functional layer is at the μm level, it is not considered. In summary, the thickness of the entire dimming glass is 1.6×2+0.38×3+0.19×4=5.1mm>5mm, which is too thick and does not meet the thickness assembly requirements of the vehicle sunroof and side windows.

[0037] The embodiment of the present invention provides a method for preparing a dimming glass functional layer, including the following steps 1 and 2.

[0038] Step 1: Figure 2 (A) and Figure 3 (A) shows that the first dye liquid crystal box A is prepared by a liquid crystal drop filling process. The liquid crystal drop filling process is an ODF (One Drop Filling) process. The first dye liquid crystal box A includes a first glass substrate 1, a first electrode layer (relatively thin, not shown in the figure), a first orientation layer (relatively thin, not shown in the figure), a first dye liquid crystal layer 2, a second orientation layer (relatively thin, not shown in the figure), a second electrode layer (relatively thin, not shown in the figure) and a second glass substrate 3 arranged in sequence, wherein the first glass substrate 1 and the second glass substrate 3 are glass substrates commonly used at present, and the thickness is 0.5 mm. The thickness of the first electrode layer, the first orientation layer, the first dye liquid crystal layer 2, the second orientation layer and the second electrode layer are all relatively thin, so the thickness of the first dye liquid crystal box A is about 1 mm.

[0039] Step 2: If Figure 2As shown in (B), the first glass substrate 1 and the second glass substrate 3 of the first dye liquid crystal cell A are both thinned to a thickness of less than or equal to 0.27 mm to obtain the second dye liquid crystal cell B. The thickness of the second dye liquid crystal cell B obtained by thinning the first dye liquid crystal cell A is reduced to less than or equal to 0.54 mm.

[0040] Among them, the thinning method is HF acid chemical etching. HF acid is extremely corrosive and can react chemically with a variety of materials, thereby achieving efficient material removal and being highly efficient. By precisely controlling the concentration, temperature, flow rate and other parameters of HF acid, fine control of the etching speed and etching shape can be achieved. HF acid can show high selectivity during the etching process, that is, it can etch specific materials while having little effect on other materials. This selectivity helps to achieve precise local processing in complex material structures. By adjusting the concentration of HF acid and the mixing ratio with other chemicals, the etching rate and etching effect can be flexibly adjusted to meet different processing requirements. This adjustability makes HF acid chemical etching widely applicable in a variety of application scenarios.

[0041] like Figure 2 As shown in (C), the second dye liquid crystal cell B is used as a substrate and the third glass substrate 5 is subjected to a liquid crystal drop-casting process to obtain a dimming glass functional layer. The third glass substrate 5 is a commonly used glass substrate with a thickness of 0.5 mm.

[0042] At this time, the dimming glass functional layer includes a first glass substrate 1, a first electrode layer, a first orientation layer, a first dye liquid crystal layer 2, a second orientation layer, a second electrode layer, a second glass substrate 3, a third electrode layer, a third orientation layer, a second dye liquid crystal layer 4, a fourth orientation layer, a fourth electrode layer and a third glass substrate 5, which are arranged in sequence. The peripheries of the first glass substrate 1 and the second glass substrate 3 are bonded by a sealant 6. The peripheries of the second glass substrate 3 and the third glass substrate 5 are bonded by a sealant 6. The orientations of the first dye liquid crystal layer 2 and the second dye liquid crystal layer 4 are perpendicular to each other. At this time, the thickness of the dimming glass functional layer is less than or equal to 1.04 mm.

[0043] Or, if Figure 3As shown in (B), the first dye liquid crystal box A is used as a substrate and the third glass substrate 5 is subjected to a liquid crystal drop forming process to obtain a third dye liquid crystal box C. At this time, the third dye liquid crystal box C includes a first glass substrate 1, a first electrode layer, a first orientation layer, a first dye liquid crystal layer 2, a second orientation layer, a second electrode layer, a second glass substrate 3, a third electrode layer, a third orientation layer, a second dye liquid crystal layer 4, a fourth orientation layer, a fourth electrode layer and a third glass substrate 5 arranged in sequence. The periphery of the first glass substrate 1 and the second glass substrate 3 are bonded by a sealant 6. The periphery of the second glass substrate 3 and the third glass substrate 5 are bonded by a sealant 6. The orientations of the first dye liquid crystal layer 2 and the second dye liquid crystal layer 4 are perpendicular to each other. The thickness of the third liquid crystal dye box is 1.5 mm.

[0044] The first glass substrate 1 and the third glass substrate 5 outside the third dye liquid crystal cell C are both thinned to a thickness of less than or equal to 0.27 mm to obtain a dimming glass functional layer. The second glass substrate 3 in the middle is fixed in the middle and cannot contact the etching liquid, so it cannot be thinned. At this time, the thickness of the dimming glass functional layer is less than or equal to 1.04 mm.

[0045] The method for preparing the dimming glass functional layer provided in the embodiment of the present application first prepares the first dye liquid crystal box A by a liquid crystal dripping box process. Then, the first glass substrate 1 and the second glass substrate 3 of the first dye liquid crystal box A are thinned to a thickness less than or equal to 0.27 mm to obtain the second dye liquid crystal box B. The second dye liquid crystal box B is used as a substrate and the third glass substrate 5 are subjected to a liquid crystal dripping box process to obtain the dimming glass functional layer. Alternatively, the first dye liquid crystal box A is used as a substrate and the third glass substrate 5 are subjected to a liquid crystal dripping box process to obtain the third dye liquid crystal box C. The first glass substrate 1 and the third glass substrate 5 outside the third dye liquid crystal box C are thinned to a thickness less than or equal to 0.27 mm to obtain the dimming glass functional layer. The thickness of the dimming glass functional layer finally obtained is less than or equal to 1.04 mm. When the dimming glass functional layer of the embodiment of the present application is used to make dimming glass, such as Figure 4As shown, the dimming glass includes a first tempered glass 7 (thickness of 1.6mm), a first adhesive layer 8 (thickness of 0.38mm), a dimming glass functional layer (thickness of less than or equal to 1.04mm), a second adhesive layer 9 (thickness of 0.38mm) and a second tempered glass 10 (thickness of 1.6mm) arranged in sequence. The structure is optimized by optimizing the preparation method. Compared with the functional layer of the existing dimming glass, there is one less adhesive layer, and the thickness of the dimming glass functional layer is reduced from four layers of glass substrate to three layers of glass substrate. Therefore, the total thickness of the manufactured dimming glass is less than or equal to 5mm, which meets the thickness assembly requirements of the vehicle sunroof and side windows. The two dye liquid crystal boxes formed by the dimming glass functional layer prepared by the preparation method of the embodiment of the present application are different from the existing two independent dye liquid crystal boxes 12 being superimposed, but are integrated together in the production process, which can effectively reduce the thickness of the middle layer of the glass substrate and improve the overall uniformity of the dimming glass functional layer. At the same time, because the middle glue layer is omitted, the process difficulty of assembling the entire tempered glass 11 is simpler than the previous production process of using two dye liquid crystal cells 12 independently.

[0046] Furthermore, the first glass substrate 1 and the second glass substrate 3 are both thinned to a thickness of 0.19 mm, so that the first glass substrate 1 and the second glass substrate 3 can be thinned based on the original production line, without the need to improve the original production line, saving time, effort and cost. At this time, the thickness of the second dye liquid crystal box B obtained after the first dye liquid crystal box A is thinned is 0.38 mm, and the thickness of the prepared dimming glass functional layer is 0.88 mm. And / or, the first glass substrate 1 and the third glass substrate 5 are both thinned to a thickness of 0.19 mm, and the thickness of the prepared dimming glass functional layer is 0.88 mm. When the dimming glass functional layer of the embodiment of the present application is used to make dimming glass, the total thickness of the dimming glass is 1.6 mm + 0.38 mm + 0.88 mm + 0.38 mm + 1.6 mm = 4.84 mm < 5 mm, which meets the thickness assembly requirements of the vehicle sunroof and side windows.

[0047] Another embodiment of the present invention provides a dimming glass functional layer, which is prepared by the above-mentioned dimming glass functional layer preparation method, and includes a first glass substrate 1, a first electrode layer, a first orientation layer, a first dye liquid crystal layer 2, a second orientation layer, a second electrode layer, a second glass substrate 3, a third electrode layer, a third orientation layer, a second dye liquid crystal layer 4, a fourth orientation layer, a fourth electrode layer, and a third glass substrate 5 arranged in sequence. The periphery of the first glass substrate 1 and the second glass substrate 3 is bonded by a sealant 6. The periphery of the second glass substrate 3 and the third glass substrate 5 is bonded by a sealant 6. The orientations of the first dye liquid crystal layer 2 and the second dye liquid crystal layer 4 are perpendicular to each other. Based on the dichroic property of the dye liquid crystal, a darker shading effect can be achieved by two layers of dye liquid crystal functional layers with perpendicular orientations, so that the dimming effect is better. The thickness of the first glass substrate 1 and the second glass substrate 3 is less than or equal to 0.27 mm, or the thickness of the first glass substrate 1 and the third glass substrate 5 is less than or equal to 0.27 mm. The total thickness of the manufactured dimming glass is less than or equal to 5 mm, which meets the thickness assembly requirements of the vehicle sunroof and side windows.

[0048] Further, the thickness of the first glass substrate 1 and the second glass substrate 3 is 0.19 mm. And / or, the first glass substrate 1 and the third glass substrate 5 are both thinned to a thickness of 0.19 mm. When the dimming glass functional layer of the embodiment of the present application is used to make the dimming glass, the total thickness of the dimming glass is 1.6 mm + 0.38 mm + 0.88 mm + 0.38 mm + 1.6 mm = 4.84 mm < 5 mm, which meets the thickness assembly requirements of the vehicle sunroof and side windows.

[0049] Optionally, the orientation angles of the first orientation layer and the second orientation layer are specific angles, which may be 45°, 90°, 180°, etc.

[0050] Another embodiment of the present invention provides a dimming glass, including the above-mentioned dimming glass functional layer.

[0051] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0052] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A method for preparing a dimming glass functional layer, characterized in that: include: Step 1: preparing a first dye liquid crystal cell by a liquid crystal drop-casting cell-forming process; Step 2: thinning the first glass substrate and the second glass substrate of the first dye liquid crystal box to a thickness of less than or equal to 0.27 mm to obtain a second dye liquid crystal box; using the second dye liquid crystal box as a substrate and the third glass substrate to perform a liquid crystal drop forming process to obtain a dimming glass functional layer; Alternatively, the first dye liquid crystal box is used as a substrate and a third glass substrate is subjected to a liquid crystal dripping process to obtain a third dye liquid crystal box; the first glass substrate and the third glass substrate outside the third dye liquid crystal box are thinned to a thickness of less than or equal to 0.27 mm to obtain a dimming glass functional layer.

2. The method for preparing a dimming glass functional layer according to claim 1, characterized in that: The thinning method is HF acid chemical etching.

3. The method for preparing a dimming glass functional layer according to claim 1, characterized in that: The first glass substrate and the second glass substrate are both thinned to a thickness of 0.19 mm; And / or, the third glass substrate and the fourth glass substrate are both thinned to a thickness of 0.19 mm.

4. A dimming glass functional layer, characterized in that: The method for preparing the dimming glass functional layer according to any one of claims 1 to 3 comprises a first glass substrate, a first electrode layer, a first orientation layer, a first dye liquid crystal layer, a second orientation layer, a second electrode layer, a second glass substrate, a third electrode layer, a third orientation layer, a second dye liquid crystal layer, a fourth orientation layer, a fourth electrode layer and a third glass substrate arranged in sequence; The first glass substrate and the second glass substrate are bonded to each other at their peripheries by a sealant; The peripheries of the second glass substrate and the third glass substrate are bonded by a sealant; The first dye liquid crystal layer and the second dye liquid crystal layer are oriented perpendicular to each other; The thickness of the first glass substrate and the second glass substrate is both less than or equal to 0.27 mm, or the thickness of the first glass substrate and the third glass substrate is both less than or equal to 0.27 mm.

5. The dimming glass functional layer according to claim 4, characterized in that: The thickness of the first glass substrate and the second glass substrate is 0.19 mm; And / or, the first glass substrate and the third glass substrate are both thinned to a thickness of 0.19 mm.

6. The dimming glass functional layer according to claim 4, characterized in that: The alignment angles of the first alignment layer and the second alignment layer are specific angles.

7. A dimming glass, characterized in that: The invention comprises the dimming glass functional layer as claimed in any one of claims 4 to 6.

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