Ultrathin glass panel assembly and foldable display panel

Abstract

The utility model provides an ultra-thin glass panel assembly and a foldable display panel, and the ultra-thin glass panel assembly comprises ultra-thin glass which is provided with at least one linearly extending bending area; the polymer optical layer is formed on one side of the ultra-thin glass, a bending stress groove is formed in the first surface, deviating from the polymer optical layer, of the polymer optical layer, the bending stress groove is overlapped with the bending area based on the projection of the ultra-thin glass, and the Young modulus of the polymer optical layer ranges from 1 GPa to 7 GPa; the bending stress groove is filled with the low-modulus optical cement, the Young modulus of the low-modulus optical cement is smaller than 0.1 MPa, the ratio of the optical transmittance of the low-modulus optical cement to the optical transmittance of the high-molecular optical layer ranges from 0.8 to 1, and the surface of the low-modulus optical cement is flush with the first surface. According to the utility model, the shock resistance and the bending performance of the composite structure can be improved at the same time, and the reliability of the bending screen assembly is improved.

Description

Technical Field

[0001] The utility model relates to the field of display panel manufacturing equipment, and more specifically, to an ultra-thin glass panel assembly and a foldable display panel. Background Art

[0002] After the advent of foldable mobile phones, higher requirements have been put forward for the glass performance of mobile phone screens (e.g., bent screen covers).

[0003] A kind of bent screen cover in the prior art includes ultra-thin glass (UTG). When the requirement for the bending radius becomes smaller and smaller, the demand for the strength of the glass gradually increases. However, to improve the bending performance, the thickness of the UTG will become thinner and thinner. However, the too-thin UTG has weak impact resistance. This is a pair of technical contradictions, and the prior art cannot provide a UTG composite structure with excellent bending and impact resistance at the same time.

[0004] In view of this, the utility model provides an ultra-thin glass panel assembly and a foldable display panel. Summary of the Utility Model

[0005] Aiming at the problems in the prior art, the purpose of the utility model is to provide an ultra-thin glass panel assembly and a foldable display panel, which overcome the difficulties of the prior art, can improve the impact resistance and bending performance of the composite structure at the same time, and improve the reliability of the bent screen assembly.

[0006] An embodiment of the utility model provides an ultra-thin glass panel assembly, including:

[0007] An ultra-thin glass, which has at least one linearly extended bending area;

[0008] A polymer optical layer is formed on one side of the ultra-thin glass. A bending stress groove is provided on the first surface of the polymer optical layer facing away from the polymer optical layer. The bending stress groove overlaps with the bending area based on the projection of the ultra-thin glass. The Young's modulus of the polymer optical layer ranges from 1 GPa to 7 GPa; and

[0009] A low-modulus optical adhesive is filled in the bending stress groove. The Young's modulus of the low-modulus optical adhesive is less than 0.1 MPa. The ratio of the optical transmittance of the low-modulus optical adhesive to the optical transmittance of the polymer optical layer ranges from 0.8 to 1. The surface of the low-modulus optical adhesive is flush with the first surface.

[0010] Preferably, the thickness range of the ultra-thin glass is 20 to 50 microns, and the thickness range of the polymer optical layer is 50 to 100 microns.

[0011] Preferably, the depth range of the bending stress groove is 30 to 80 microns.

[0012] Preferably, the refractive index of the ultra-thin glass ranges from 1.4 to 1.6, the refractive index of the polymer optical layer ranges from 1.4 to 1.6, and the refractive index of the low-modulus optical adhesive ranges from 1.4 to 1.6.

[0013] Preferably, the ultra-thin glass is in surface contact and bonded to the second surface of the polymer optical layer, and the low-modulus optical adhesive is in surface contact and bonded to the inner wall surface of the bending stress groove on the first surface of the polymer optical layer.

[0014] Preferably, the optical transmittance of the low-modulus optical adhesive is the same as that of the polymer optical layer.

[0015] Preferably, the width of the bending stress groove is L, and the preset bending radius of the ultra-thin glass is R, where L = πR.

[0016] Preferably, the cross-section of the bending stress groove is an isosceles inverted trapezoid.

[0017] Another embodiment of the present invention further provides a manufacturing method of an ultra-thin glass panel assembly for manufacturing the above-mentioned ultra-thin glass panel assembly, including the following steps:

[0018] S110. Provide an ultra-thin glass having at least one linearly extended bending region;

[0019] S120. Provide a polymer optical layer formed on one side of the ultra-thin glass, and the Young's modulus of the polymer optical layer ranges from 1 GPa to 7 GPa;

[0020] S130. Provide a bending stress groove on the first surface of the polymer optical layer facing away from the polymer optical layer, and the projection of the bending stress groove overlaps with the bending region based on the ultra-thin glass; and

[0021] S140. Provide a low-modulus optical adhesive and fill it in the bending stress groove. The Young's modulus of the low-modulus optical adhesive is less than 0.1 MPa, the ratio range of the optical transmittance of the low-modulus optical adhesive to that of the polymer optical layer is 0.9 to 1, and the surface of the low-modulus optical adhesive is flush with the first surface.

[0022] Another embodiment of the present invention further provides a foldable display panel including the above-mentioned ultra-thin glass panel assembly.

[0023] The purpose of the present invention is to provide a mobile terminal with a foldable screen, which can simultaneously improve the impact resistance and bending performance of the composite structure and enhance the reliability of the bent screen assembly. Description of the Drawings

[0024] Other features, objects, and advantages of the present utility model will become more apparent by reading the following detailed description of non - restrictive embodiments with reference to the accompanying drawings.

[0025] Figure 1 is a cross - sectional view of the ultra - thin glass panel assembly of the present utility model.

[0026] Figure 2 is a flowchart of the manufacturing method of the ultra - thin glass panel assembly of the present utility model.

[0027] Figures 3 to 6 is a schematic diagram of the manufacturing process of the manufacturing method of the ultra - thin glass panel assembly of the present utility model.

[0028] Reference Numerals

[0029] 1 Ultra - thin glass

[0030] 2 Polymer optical layer

[0031] 21 First surface

[0032] 22 Second surface

[0033] 23 Bend stress groove

[0034] 3 Low - modulus optical adhesive Detailed Embodiments

[0035] The following uses specific examples to illustrate the embodiments of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through other different specific embodiments. Various details in the present application can also be modified or changed according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0036] The following takes the drawings as a reference and details the embodiments of the present application so that those skilled in the technical field to which the present application belongs can easily implement it. The present application can be embodied in many different forms and is not limited to the embodiments described herein.

[0037] In the description of the present application, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics represented can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples represented in the present application and the features of different embodiments or examples.

[0038] In addition, the terms "first" and "second" are used only for the purpose of indication and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0039] To clearly illustrate the present application, devices irrelevant to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0040] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" with other elements placed therebetween. In addition, when it is said that a certain device "includes" a certain component, unless there is a particularly contrary record, it does not exclude other components, but means that other components can also be included.

[0041] When it is said that a device is "above" another device, this can be directly above the other device, but there can also be other devices therebetween. When it is said that a device is "directly" "above" another device by contrast, there are no other devices therebetween.

[0042] Although in some instances the terms first, second, etc. are used herein to denote various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are indicated. Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to also include the plural forms unless the context clearly dictates otherwise. It should be further understood that the terms "comprising", "including" indicate the presence of the features, steps, operations, elements, components, items, kinds, and / or groups, but do not preclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The term "or" and "and / or" used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". An exception to this definition occurs only when the combination of elements, functions, steps, or operations are mutually exclusive in some way.

[0043] The technical terms used herein are only for referring to specific embodiments and are not intended to limit the present application. The singular forms used herein also include the plural forms as long as the statement does not clearly indicate the contrary meaning. The meaning of "including" used in the specification is to embody specific characteristics, regions, integers, steps, operations, elements, and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0044] Although not differently defined, including the technical terms and scientific terms used herein, all terms have the same meaning as generally understood by those skilled in the technical field to which the present application pertains. Terms defined in commonly used dictionaries are additionally interpreted to have a meaning consistent with the relevant technical literature and the content currently presented. As long as they are not defined, they should not be over-interpreted as ideal or overly formulaic meanings.

[0045] Figure 1 is a cross-sectional view of the ultra-thin glass panel assembly of the present utility model. As Figure 1As shown in the figure, the ultra-thin glass panel assembly of the present utility model includes: an ultra-thin glass 1, a polymer optical layer 2, and a low-modulus optical adhesive 3. Among them, the ultra-thin glass 1 has at least a linearly extended bending region. The polymer optical layer 2 is formed on one side of the ultra-thin glass 1. A bending stress groove 23 is provided on the first surface 21 of the polymer optical layer 2 facing away from the polymer optical layer 2. The bending stress groove 23 overlaps with the projection of the ultra-thin glass 1 and the bending region. The Young's modulus of the polymer optical layer 2 ranges from 1 GPa to 7 GPa. The low-modulus optical adhesive 3 is filled in the bending stress groove 23. The Young's modulus of the low-modulus optical adhesive 3 is less than 0.1 MPa. The ratio of the optical transmittance of the low-modulus optical adhesive 3 to the optical transmittance of the polymer optical layer 2 ranges from 0.8 to 1. The surface of the low-modulus optical adhesive 3 is flush with the first surface 21. The present utility model provides a composite material structure, especially by combining ultra-thin glass (Ultra-Thin Glass, UTG) with high-performance polymer materials, aiming to improve the impact resistance and bending performance of the composite structure. This structure has broad application prospects in the fields of flexible electronic devices, foldable displays, etc.

[0046] In a preferred embodiment, the thickness range of the ultra-thin glass 1 is 20 to 50 micrometers, and the thickness range of the polymer optical layer 2 is 50 to 100 micrometers, but it is not limited thereto.

[0047] In a preferred embodiment, the depth range of the bending stress groove 23 is 30 to 80 micrometers, but it is not limited thereto.

[0048] In a preferred embodiment, the refractive index range of the ultra-thin glass 1 is 1.4 to 1.6, the refractive index range of the polymer optical layer 2 is 1.4 to 1.6, and the refractive index range of the low-modulus optical adhesive 3 is 1.4 to 1.6, but it is not limited thereto.

[0049] In a preferred embodiment, the ultra-thin glass 1 is in surface contact and bonded with the second surface 22 of the polymer optical layer 2, and the low-modulus optical adhesive 3 is in surface contact and bonded with the inner wall surface of the bending stress groove 23 of the first surface 21 of the polymer optical layer 2, but it is not limited thereto.

[0050] In a preferred embodiment, the optical transmittance of the low-modulus optical adhesive 3 is the same as that of the polymer optical layer 2, but it is not limited thereto.

[0051] In a preferred embodiment, the width of the bending stress groove 23 is L, and the preset bending radius of the ultra-thin glass 1 is R, and L = πR, but it is not limited thereto.

[0052] In a preferred embodiment, the cross-section of the bending stress groove 23 is an isosceles inverted trapezoid, but it is not limited thereto.

[0053] Specific embodiments of the present utility model are as follows:

[0054] Continuing to refer to Figure 1 , the present utility model combines an ultra-thin glass 1 (UTG) with a thickness of 20 - 50 microns and a polymer optical layer 2 (polymer material). The polymer material needs to meet specific mechanical and optical property requirements, which are as follows:

[0055] The requirements for the polymer material are as follows:

[0056] Young's modulus: The Young's modulus of the polymer material should be greater than 1 GPa to ensure sufficient rigidity and impact resistance after being combined with UTG.

[0057] Thickness: The thickness of the polymer material is between 50 - 100 microns, ensuring the light and thin characteristics of the overall structure while providing sufficient mechanical support.

[0058] The mechanical properties of the polymer material are as follows:

[0059] Combining property: After the polymer material is combined with UTG, it does not fall off within the working bending radius. Even under repeated bending, the composite material can still maintain good combining properties.

[0060] Yield resistance property: The polymer material does not yield or break within the working radius, ensuring its durability during long-term use.

[0061] The optical properties of the polymer material are as follows:

[0062] Penetrability: The optical transmittance of the polymer material needs to be greater than 91% to ensure its transparency in display applications.

[0063] Refractive index: The refractive index of the polymer material needs to be close to that of the glass, specifically required to be 1.5 ± 0.1, to avoid mismatches in interface optical properties and ensure the consistency of overall optical properties.

[0064] To improve the impact resistance of the composite structure, there is no other adhesive material at the interface where UTG is combined with the polymer material. This design avoids the interface weaknesses that traditional adhesive materials may bring, thereby improving the impact resistance of the overall structure. In the bending area, a groove structure is designed on one side of the polymer material. The specific parameters of the groove are as follows: Groove depth: 30 - 80 microns, ensuring that the groove can significantly reduce the local stiffness, thereby improving the bending performance. Groove filling material: The groove is filled with a low modulus optical adhesive 3 (Young's modulus less than 0.1 MPa). This material has a low stiffness and can effectively reduce the local rigidity in the bending area, thereby improving the flexibility of the composite material in the bending area.

[0065] Based on the above composite structure,

[0066] Composite structures need to have the following mechanical properties in practical applications:

[0067] Impact resistance: The overall structure can effectively absorb energy and avoid damage under external impact.

[0068] Bending durability: The material structure does not crack or fall off under repeated bending, ensuring its long-term reliability.

[0069] The optical properties of the composite structure must meet the following requirements:

[0070] High transparency: The light transmittance of the material must be greater than 91% to ensure its transparency in optical applications.

[0071] Refractive index matching: The refractive index of the material is within the range of 1.5±0.1 to ensure matching with the optical performance of UTG and avoid optical interface reflection or refraction anomalies.

[0072] The utility model significantly improves the material's impact resistance by designing a high-performance composite material structure, combining ultra-thin glass with specific polymer materials without using traditional adhesive materials. At the same time, the material's bending performance is further improved by the special structural design in the bending area and filling with low modulus optical glue.

[0073] Figure 2 FIG. 1 is a flow chart of a method for manufacturing an ultra-thin glass panel assembly of the utility model. Figure 2 The utility model also provides a method for manufacturing an ultra-thin glass panel assembly, which is used to manufacture the ultra-thin glass panel assembly, comprising the following steps:

[0074] S110, providing an ultra-thin glass 1, wherein the ultra-thin glass 1 has at least one linearly extending bending region.

[0075] S120, providing a polymer optical layer 2, formed on one side of the ultra-thin glass 1, the Young's modulus of the polymer optical layer 2 ranges from 1 GPa to 7 GPa.

[0076] S130 , a bending stress groove 23 is provided on a first surface 21 of the polymer optical layer 2 away from the polymer optical layer 2 , and the bending stress groove 23 overlaps with the bending area based on the projection of the ultra-thin glass 1 .

[0077] as well as

[0078] S140, provide a low modulus optical adhesive 3 to fill the bending stress groove 23, the Young's modulus of the low modulus optical adhesive 3 is less than 0.1MPa, the ratio of the optical transmittance of the low modulus optical adhesive 3 to the optical transmittance of the polymer optical layer 2 is in the range of 0.9 to 1, and the surface of the low modulus optical adhesive 3 is flush with the first surface 21.

[0079] In a preferred embodiment, the thickness range of the ultra-thin glass 1 is 20 to 50 micrometers, and the thickness range of the polymer optical layer 2 is 50 to 100 micrometers, but not limited thereto.

[0080] In a preferred embodiment, the depth range of the bending stress groove 23 is 30 to 80 micrometers, but not limited thereto.

[0081] In a preferred embodiment, the refractive index range of the ultra-thin glass 1 is 1.4 to 1.6, the refractive index range of the polymer optical layer 2 is 1.4 to 1.6, and the refractive index range of the low-modulus optical adhesive 3 is 1.4 to 1.6, but not limited thereto.

[0082] In a preferred embodiment, the ultra-thin glass 1 is in surface contact and adhered to the second surface 22 of the polymer optical layer 2, and the low-modulus optical adhesive 3 is in surface contact and adhered to the inner wall surface of the bending stress groove 23 of the first surface 21 of the polymer optical layer 2, but not limited thereto.

[0083] In a preferred embodiment, the optical transmittance of the low-modulus optical adhesive 3 is the same as that of the polymer optical layer 2, but not limited thereto.

[0084] In a preferred embodiment, the width of the bending stress groove 23 is L, and the preset bending radius of the ultra-thin glass 1 is R, where L = πR, but not limited thereto.

[0085] In a preferred embodiment, the cross-section of the bending stress groove 23 is an isosceles inverted trapezoid, but not limited thereto.

[0086] Figures 3 to 6 is a process schematic diagram of the manufacturing method of the ultra-thin glass panel assembly for implementing the present utility model. As Figure 3 shown, an ultra-thin glass 1 is provided, and the ultra-thin glass 1 has at least a linearly extending bending region. The refractive index range of the ultra-thin glass 1 is 1.4 to 1.6. The thickness range of the ultra-thin glass 1 is 20 to 50 micrometers.

[0087] As Figure 4 shown, a polymer optical layer 2 is provided, formed on one side of the ultra-thin glass 1, and the ultra-thin glass 1 is in surface contact and adhered to the second surface 22 of the polymer optical layer 2. The refractive index range of the polymer optical layer 2 is 1.4 to 1.6, the thickness range of the polymer optical layer 2 is 50 to 100 micrometers. The Young's modulus range of the polymer optical layer 2 is 1 GPa to 7 GPa.

[0088] As Figure 5As shown in the figure, a bending stress groove 23 is provided on the first surface 21 of the polymer optical layer 2 facing away from the polymer optical layer 2. The projection of the bending stress groove 23 based on the ultra-thin glass 1 overlaps with the bending area. The depth range of the bending stress groove 23 is 30 to 80 micrometers. The width of the bending stress groove 23 is L, and the preset bending radius of the ultra-thin glass 1 is R, where L = πR. The cross-section of the bending stress groove 23 is an isosceles inverted trapezoid.

[0089] As Figure 6 shown, a low-modulus optical adhesive 3 is provided and filled in the bending stress groove 23. The low-modulus optical adhesive 3 contacts and fits with the inner wall surface of the bending stress groove 23 on the first surface 21 of the polymer optical layer 2. The Young's modulus of the low-modulus optical adhesive 3 is less than 0.1 MPa. The ratio range of the optical transmittance of the low-modulus optical adhesive 3 to the optical transmittance of the polymer optical layer 2 is 0.9 to 1. The surface of the low-modulus optical adhesive 3 is flush with the first surface 21. The refractive index range of the low-modulus optical adhesive 3 is 1.4 to 1.6. The optical transmittance of the low-modulus optical adhesive 3 is the same as that of the polymer optical layer 2.

[0090] The present utility model also provides a foldable display panel, including the above-mentioned ultra-thin glass panel assembly. The ultra-thin glass panel assembly therein includes: an ultra-thin glass 1, a polymer optical layer 2, and a low-modulus optical adhesive 3. Among them, the ultra-thin glass 1 has at least a linearly extended bending area. The polymer optical layer 2 is formed on one side of the ultra-thin glass 1. A bending stress groove 23 is provided on the first surface 21 of the polymer optical layer 2 facing away from the polymer optical layer 2. The projection of the bending stress groove 23 based on the ultra-thin glass 1 overlaps with the bending area. The Young's modulus range of the polymer optical layer 2 is 1 GPa to 7 GPa. The low-modulus optical adhesive 3 is filled in the bending stress groove 23. The Young's modulus of the low-modulus optical adhesive 3 is less than 0.1 MPa. The ratio range of the optical transmittance of the low-modulus optical adhesive 3 to the optical transmittance of the polymer optical layer 2 is 0.8 to 1. The surface of the low-modulus optical adhesive 3 is flush with the first surface 21. The foldable display panel of the present utility model has the structure and physical properties of the above-mentioned ultra-thin glass panel assembly, which will not be elaborated here.

[0091] In summary, the purpose of the present utility model is to provide an ultra-thin glass panel assembly and a foldable display panel, which can simultaneously improve the impact resistance and bending performance of the composite structure and enhance the reliability of the bent screen assembly.

[0092] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present utility model.

Claims

1. An ultra-thin glass panel assembly, characterized in that: include: An ultra-thin glass (1), the ultra-thin glass (1) having at least one linearly extending bending region; a polymer optical layer (2) formed on one side of the ultra-thin glass (1), a bending stress groove (23) being arranged on a first surface (21) of the polymer optical layer (2) away from the polymer optical layer (2), the bending stress groove (23) overlapping with the bending region based on a projection of the ultra-thin glass (1), the Young's modulus of the polymer optical layer (2) being in a range of 1 GPa to 7 GPa; and A low modulus optical adhesive (3) is filled in the bending stress groove (23), the Young's modulus of the low modulus optical adhesive (3) is less than 0.1 MPa, the ratio of the optical transmittance of the low modulus optical adhesive (3) to the optical transmittance of the polymer optical layer (2) is in the range of 0.8 to 1, and the surface of the low modulus optical adhesive (3) is flush with the first surface (21).

2. The ultra-thin glass panel assembly according to claim 1, characterized in that: The thickness of the ultra-thin glass (1) is in the range of 20 to 50 micrometers, and the thickness of the polymer optical layer (2) is in the range of 50 to 100 micrometers.

3. The ultra-thin glass panel assembly according to claim 2, characterized in that: The depth of the bending stress groove (23) ranges from 30 to 80 microns.

4. The ultra-thin glass panel assembly according to claim 1, characterized in that: The refractive index of the ultra-thin glass (1) is in the range of 1.4 to 1.6, the refractive index of the polymer optical layer (2) is in the range of 1.4 to 1.6, and the refractive index of the low modulus optical adhesive (3) is in the range of 1.4 to 1.

6.

5. The ultra-thin glass panel assembly according to claim 1, characterized in that: The ultra-thin glass (1) is in contact with and bonded to the second surface (22) of the polymer optical layer (2), and the low modulus optical adhesive (3) is in contact with and bonded to the inner wall surface of the bending stress groove (23) of the first surface (21) of the polymer optical layer (2).

6. The ultra-thin glass panel assembly according to claim 1, characterized in that: The optical transmittance of the low modulus optical adhesive (3) is the same as the optical transmittance of the polymer optical layer (2).

7. The ultra-thin glass panel assembly according to claim 1, characterized in that: The width of the bending stress groove (23) is L, and the preset bending radius of the ultra-thin glass (1) is R, where L=πR.

8. The ultra-thin glass panel assembly according to claim 1, characterized in that: The cross section of the bending stress groove (23) is an isosceles inverted trapezoid.

9. A foldable display panel, characterized in that: The invention comprises the ultra-thin glass panel assembly as claimed in any one of claims 1 to 8.

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