Ultrathin glass and folding screen comprising same

Abstract

The utility model belongs to the technical field of ultra-thin glass. The utility model provides ultra-thin glass and a folding screen containing the ultra-thin glass, the ultra-thin glass comprises a glass body, the surface of at least one side of the glass body comprises a non-folding area and a folding area which are connected with each other, the folding area is provided with a transition structure, and the folding area and the non-folding area are transited through the transition structure; at least two folding areas are arranged on the surface of the same side of the glass body. Compared with the conventional ultra-thin glass which can only be singly folded, the multi-folding or coiling function of the ultra-thin glass is realized by arranging a plurality of folding areas, and the blank in the field is filled.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultra-thin glass and relates to ultra-thin glass and a folding screen containing the same. Background Art

[0002] In recent years, with the continuous evolution of mobile communication technology and consumer demand, smartphone design and functionality have also continued to innovate. Foldable phones, as an emerging form factor, have gradually attracted widespread market attention with their unique combination of portability and a large screen experience. A core component of foldable phones is their flexible display, and the choice of cover material for this key component directly affects the product's durability, visual quality, and user experience.

[0003] In the early days, the covers of foldable phones were mostly made of transparent polyimide (CPI) material because of its good flexibility and light transmittance, which can meet the needs of repeated bending of the screen. However, with technological advancements and rising market demand, the limitations of CPI material began to emerge, especially in terms of impact resistance, and it could not meet the growing durability requirements. Therefore, a new material called Ultra Thin Glass (UTG) came into being, aiming to overcome the shortcomings of CPI while retaining its advantages.

[0004] UTG is a very thin (usually about 0.03mm) tempered glass with high transparency and mechanical strength, which can withstand repeated bending without being easily damaged. Compared with CPI, UTG has higher hardness, more wear-resistant surface, and is not easy to be scratched, which makes it excellent in protecting the screen from daily wear and tear. For example, CN116332522A is a CFG ultra-thin glass and its preparation method and application. The CFG (center foldable) ultra-thin glass includes a molding area and a non-molding area, wherein the molding area is further subdivided into a flat area, a bending area, and a symmetrically distributed slope area on both sides of the bending area. This design aims to disperse stress through smooth transition, reduce stress concentration that may occur during bending, and effectively reduce the resilience of CFG.

[0005] However, while CFG ultra-thin glass theoretically offers an improved solution, its actual manufacturing process still suffers from several drawbacks. First, controlling the dimensional accuracy of the bending and transition zones is challenging, directly impacting the quality and performance consistency of the final product. Second, the relatively uniform shape of the shaping zones of CFG ultra-thin glass limits design flexibility and makes it difficult to meet the diverse needs of different application scenarios. Most importantly, even with special treatment, the strength of the bending zones of CFG ultra-thin glass still needs to be improved to ensure that it will not suffer structural damage or failure due to frequent bending during long-term use.

[0006] In addition, the existing single-fold UTG glass can no longer meet the market and field's new demands for large size, special folding shapes, etc. The multi-fold UTG glass products require the formation of multiple foldable areas on thinner glass, which makes the process more difficult, and the existing processing and manufacturing technology is not yet mature.

[0007] Therefore, it is still necessary to develop a foldable ultra-thin glass product that can achieve excellent bending performance and higher strength to meet the comprehensive needs of future smart devices. Utility Model Content

[0008] In view of the problems existing in the prior art, the purpose of the present invention is to provide an ultra-thin glass and a folding screen containing the same. The ultra-thin glass is transitioned through a transition structure and multiple folding areas are set at the same time, thereby realizing the multi-folding or curling function of the ultra-thin glass.

[0009] To achieve this purpose, the present invention adopts the following technical solutions:

[0010] In a first aspect, the utility model provides an ultra-thin glass comprising a glass body, wherein the surface of at least one side of the glass body comprises a non-folding area and a folding area connected to each other, the folding area having a transition structure, and transitioning to the non-folding area through the transition structure; on the same side surface of the glass body, the number of the folding areas is at least two.

[0011] In the present invention, when the number of folding zones is greater than or equal to two, it is considered "multi-fold" ultra-thin glass. The ultra-thin glass of the present invention achieves the transition between the folding zone and the non-folding zone through a transition structure. On this basis, compared with conventional ultra-thin glass that can only be folded in one direction, the present invention provides multiple folding zones to achieve the multi-folding or rolling function of ultra-thin glass, filling a gap in the field.

[0012] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following technical solutions, the technical objectives and beneficial effects of the present invention can be better achieved and realized.

[0013] As a preferred technical solution of the present invention, the transition structure includes a vertical transition structure and / or a slope transition structure.

[0014] The ultra-thin glass of the present invention preferably realizes a smooth buffer transition or gradient buffer transition between the folding area and the non-folding area through a slope transition structure, that is, it is not a sudden transition structure, which effectively improves the use stability of the multi-fold ultra-thin glass.

[0015] As a preferred technical solution of the present invention, the contour shape of the slope transition structure contains straight lines and / or curves.

[0016] Preferably, the slope transition structure includes any one of a fully linear slope, a stepped slope, an S-shaped slope or an arc-shaped slope.

[0017] As a preferred technical solution of the present invention, the folding area includes two opposite transition structures, so that the contour shape of the folding area is a groove.

[0018] Exemplarily, a groove composed of two vertical transition structures includes a rectangular groove; a groove composed of two fully straight slopes includes a trapezoidal groove; a groove composed of two stepped slopes includes a quasi-trapezoidal groove whose trapezoidal sides are stepped structures; a groove composed of two S-shaped slopes includes a quasi-trapezoidal groove whose trapezoidal sides are chamfered; and a groove composed of two arc-shaped slopes includes an arc-shaped groove.

[0019] In the present invention, when one side surface of the ultra-thin glass has a folding area and the folding area is a groove, it can be called single-sided grooved glass. When both sides of the ultra-thin glass have folding areas and the folding areas are grooves, it can be called double-sided grooved glass.

[0020] As a preferred technical solution of the present invention, a patterned structure is formed on the surface of the glass body in the folding area.

[0021] The present invention effectively improves the product's impact resistance by creating a uniformly distributed patterned structure in the folding area, i.e., the area where the ultra-thin glass folds or curls. It can also effectively reduce the expansion of the ultra-thin glass during the strengthening process, thereby reducing the impact of the strengthening process on the product's appearance. Compared with unpatterned ultra-thin glass, the impact resistance is effectively improved by at least 30%.

[0022] It should be noted that the impact strength is generally evaluated by a pen drop test (pen specifications: 12.8g / 0.5mm), in which the pen tip is dropped vertically with the glass not broken for comparison. The corresponding maximum height of the ultra-thin glass in the present invention is increased by 30%, so the impact strength is increased by 30%.

[0023] As a preferred technical solution of the present invention, in the folding area, the surface of the glass body except the transition structure forms the patterned structure.

[0024] Preferably, the patterned structure includes etched bumps arranged in an array.

[0025] Preferably, the shape of the etched bumps includes any one of a hemisphere, a semi-ellipsoid or a polyhedron.

[0026] As a preferred technical solution of the present invention, the thickness of the glass body in the folding area is smaller than the thickness of the glass body in the non-folding area.

[0027] Preferably, the thickness of the glass body in the non-folding area is the same or different.

[0028] In the present invention, the folding area and the non-folding area have different thicknesses, so it is an "unequal thickness" ultra-thin glass; and all non-folding areas can have equal or unequal thicknesses, which can be reasonably selected and adjusted according to needs.

[0029] As a preferred technical solution of the present invention, in the folding area, the thickness of the glass body excluding the transition structure is 20 to 50 μm, for example, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, 35 μm, 36 μm, 37 μm, 38 μm, 39 μm, 40 μm, 41 μm, 42 μm, 43 μm, 44 μm, 45 μm, 46 μm, 47 μm, 48 μm, 49 μm or 50 μm, etc.

[0030] Preferably, the thickness of the glass body in the non-folding area is 70 to 250 μm, for example, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm or 250 μm, etc.

[0031] As a preferred technical solution of the present invention, the edge of the ultra-thin glass is chamfered. Figure 12 As shown, when the edge portion is chamfered, the depth of the chamfered portion is B and the width is A.

[0032] Preferably, the reduction in length and width of the chamfered ultra-thin glass is 0.01 to 0.1 mm, such as 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm or 0.1 mm.

[0033] Preferably, the depth of the chamfered edge of the folding area is 25 to 100 μm, for example, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm or 100 μm, and the width is 5 to 40 μm, for example, 5 μm, 8 μm, 10 μm, 13 μm, 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm or 40 μm, etc.

[0034] Preferably, the depth of the chamfered edge of the non-folding area is 25 to 100 μm, for example, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm or 100 μm, and the width is 50 to 200 μm, for example, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm or 200 μm, etc.

[0035] In the present invention, the edge of the ultra-thin glass is passivated, such as by chamfering, to effectively avoid breakage during subsequent strengthening treatment, while also improving the edge strength of the obtained ultra-thin glass during bending, thereby reducing bending breakage.

[0036] In a second aspect, the present invention provides a folding screen comprising the ultra-thin glass described in the first aspect.

[0037] It should be noted that the present invention does not specifically limit the preparation and production methods of the ultra-thin glass, and a reasonable selection can be made according to actual conditions.

[0038] Illustratively, the present invention provides a method for processing and manufacturing ultra-thin glass according to the first aspect, comprising the following steps:

[0039] (1) providing a glass body, inserting the glass body into a shaping liquid for shaping, and starting to form a folding zone;

[0040] (2) forming a transition structure by controlling the relative position between the liquid surface of the shaping liquid and the surface of the glass body;

[0041] (3) Repeat steps (1) and (2) in sequence until all folding areas are shaped.

[0042] In the processing and manufacturing method described, mass production can be achieved by performing wet etching in a shaping liquid to shape or groove, and the processing difficulty is much lower than that through CNC machining, mechanical polishing, etc. The etching grooving method is a non-hard contact processing method, which can be used to groove thicker cover glass and flexible glass with a thickness of less than 0.2mm, and can effectively reduce breakage during the grooving process. Compared with grooving by machining, etching grooving has great advantages in terms of processing efficiency, processing consumables, and processing yield. Flexible folding products processed by etching grooving have no microcracks on the surface of the folding area due to non-contact processing. When compared under the same conditions of 30μm thickness in the folding area and 0.6mm folding radius, the product folding pass rate can be increased by more than 50% compared with other processing methods. In addition, the wet etching process is simple and easy to operate, has a large cost advantage, and is also easy to perform shaping or grooving of various shapes.

[0043] As a preferred technical solution of the present invention, in step (1), the glass body is obtained by thinning, cutting, pre-cleaning and drying raw glass.

[0044] Preferably, the thinning is performed until the thickness of the glass body is 100-300 μm, for example, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm, 200 μm, 220 μm, 240 μm, 260 μm, 280 μm or 300 μm.

[0045] In the manufacturing method, there are no specific restrictions on the length and width of the raw glass and the length and width of the glass body after cutting. They should be reasonably adjusted and selected according to needs. For example, the raw glass has a length of 30 to 700 mm and a width of 300 to 650 mm. After cutting, the glass body has a length of 10 to 500 mm and a width of 80 to 200 mm.

[0046] Preferably, the cutting method includes laser cutting and / or glass knife cutting.

[0047] Preferably, the pre-cleaning method includes cleaning with a weak alkaline cleaning agent with a concentration of 0.5% to 10%, for example, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%, etc., and then soaking in pure water at 30 to 95°C, for example, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C or 95°C, for 5 to 60 minutes, for example, 5 minutes, 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes or 60 minutes, etc.

[0048] Preferably, in step (1), the glass body is protected before being shaped, and the surface of the glass body after being protected is a non-shaping area, where no shaping occurs and the folding area is not formed.

[0049] Preferably, the protection method includes attaching a protective film, printing protective ink or spraying photoresist.

[0050] Preferably, in step (1), before the glass body is shaped, the glass body is fixed on a backing plate so that the area to be shaped is exposed to the outside world to obtain a fixed body, and the fixed body is extended into the shaping liquid so that the area to be shaped of the glass body undergoes the shaping.

[0051] In the manufacturing method, the area to be shaped is the area corresponding to the folding area before the shaping etching is performed.

[0052] Preferably, when both side surfaces of the glass body have areas to be shaped, the lining plate includes a hollow lining plate.

[0053] In the processing and manufacturing method, the folding area is provided on one side surface of the ultra-thin glass, and the other side is single-sidedly protected, and the single-sidedly protected side is provided close to the lining plate; if the folding areas are provided on both sides of the ultra-thin glass, no protection is required, and a hollow lining plate is used to expose both sides of the ultra-thin glass to the outside world.

[0054] In the manufacturing method, the lining plate is an acid-resistant and corrosion-resistant lining plate, and the glass body can be fixed to the lining plate by bonding with adhesive tape.

[0055] It should be emphasized that in the processing and manufacturing method, mass production can be achieved by wet etching in the plastic liquid. For example, a single device containing 3 etching troughs is used, each etching trough can hold an etching basket, one basket can hold 10 lining plates, and one lining plate can hold 5 PCS products (glass body). It takes an average of 600 seconds to produce a basket of products, and the production CT of a single product is 12 seconds. The CT of a single slotted product can usually be less than 15 seconds. The processing difficulty is much lower than that through CNC processing, mechanical polishing, etc., which greatly improves production efficiency.

[0056] Preferably, in step (1), the shaping liquid includes a first acid solution, and the first acid solution includes at least one of nitric acid, sulfuric acid or hydrochloric acid and hydrofluoric acid.

[0057] Preferably, the etching rate of the shaping liquid on the glass body is 1 to 10 μm / min, for example, 1 μm / min, 2 μm / min, 3 μm / min, 4 μm / min, 5 μm / min, 6 μm / min, 7 μm / min, 8 μm / min, 9 μm / min or 10 μm / min, etc.

[0058] As a preferred technical solution of the present invention, step (2) includes preventing the liquid surface of the shaping liquid and the surface of the glass body from moving relative to each other, thereby forming a vertical transition structure; or causing the liquid surface of the shaping liquid and the surface of the glass body to move relative to each other, thereby forming a slope transition structure;

[0059] Preferably, the method of causing the liquid level of the shaping liquid and the surface of the glass body to move relative to each other includes keeping the liquid level of the shaping liquid unchanged and moving the position of the glass body, or keeping the position of the glass body unchanged and raising or lowering the liquid level of the shaping liquid.

[0060] In the manufacturing method, the movement control of the liquid level of the shaping liquid can be achieved by injecting or discharging the shaping liquid into the container; the position of the glass body can be achieved by lifting or lowering it through a mechanical structure or equipment.

[0061] Preferably, the relative movement is repeated with a repetition frequency of 1 to 60 times / min until the slope transition structure is formed, for example, 1 time / min, 5 times / min, 8 times / min, 10 times / min, 15 times / min, 20 times / min, 25 times / min, 30 times / min, 35 times / min, 40 times / min, 45 times / min, 50 times / min, 55 times / min or 60 times / min, etc.

[0062] In the processing and manufacturing method, repeating the relative movement means that, for a certain slope transition structure, no matter whether the liquid level position of the shaping liquid or the position of the glass body is changed, from the beginning to the end of its shaping process, the liquid level of the shaping liquid has an initial position and an end position on the glass body (that is, the positions on the glass body to which the two ends of a slope transition structure correspond respectively before shaping), and the relative movement from the initial position to the end position is one time. When repeated, it starts from the initial position again to the end position, which is the second time, and so on.

[0063] Preferably, the relative movement is controlled to be uniform so that the contour of the slope transition structure contains a straight line.

[0064] The principle behind the sloped transition structure formed in the aforementioned manufacturing method is that, through relative motion, different portions of the glass body's surface experience varying degrees of shaping effects, thereby achieving a sloped transition structure. For example, when the position of the glass body remains unchanged and the shaping liquid level rises, the portion just submerged experiences a shorter total shaping time, resulting in less effect and less thickness reduction. Thus, a linear slope can be achieved through uniform relative motion.

[0065] Preferably, the contour shape of the slope transition structure contains a curve by controlling the relative movement to be not uniform and / or spraying pure water above the liquid surface of the shaping liquid during the relative movement.

[0066] Furthermore, in the processing and manufacturing method, the purpose of spraying pure water is to allow the pure water to eventually flow to the surface of the shaping liquid to dilute the surface of the shaping liquid, thereby adjusting the shaping ability of the surface liquid, and then obtaining a curved slope transition structure, and realizing the control and adjustment of the curvature of the curve.

[0067] Preferably, the curvature of the curve is adjusted by controlling the spraying interval and spraying flow rate of the pure water spray.

[0068] Preferably, when the curvature of the curve gradually increases, the spraying interval is controlled to gradually decrease and / or the spraying flow rate is controlled to gradually increase.

[0069] Preferably, the spray interval is 30 to 500 s, for example, 30 s, 50 s, 80 s, 100 s, 150 s, 200 s, 250 s, 300 s, 350 s, 400 s, 450 s or 500 s, etc., preferably 30 to 300 s, and the spray flow rate is 20 to 500 mL, for example, 20 mL, 50 mL, 80 mL, 100 mL, 150 mL, 200 mL, 250 mL, 300 mL, 350 mL, 400 mL, 450 mL or 500 mL, etc., preferably 100 to 300 mL.

[0070] Preferably, a movement interval is provided during the relative movement, during which no relative movement occurs, so that the contour of the slope transition structure has a stepped structure.

[0071] It should be noted that in the manufacturing method, when no relative movement occurs during the movement interval, and the liquid surface of the shaping liquid and the glass body remain relatively still, a nearly vertical (non-sloped) transition structure is formed. By sequentially arranging the vertical transition structure and the sloped transition structure, the overall sloped transition structure has a stepped structure.

[0072] As a preferred technical solution of the present invention, when the contour shape of the folding zone is a groove composed of two opposite transition structures, step (3) includes turning the glass body and repeating steps (1) and (2) on the other end of the glass body until the shaping of the folding zone is completed to obtain the groove.

[0073] As a preferred technical solution of the present invention, the processing and manufacturing method also includes step (4), which includes performing patterned etching on the obtained folding area to form a patterned structure on the surface of the glass body in the folding area to obtain ultra-thin glass.

[0074] Preferably, the patterned etching method in step (4) includes covering the surface of the glass body in the folding area with a patterned protective layer, wherein the patterned protective layer includes protection points arranged in an array and uncovered areas between the protection points. After etching the uncovered areas with an etching solution, the protection points are removed to obtain etched bumps to form a patterned structure.

[0075] Preferably, the shape of the protection points arranged in the array includes at least one of a circle, an ellipse or a polyhedron.

[0076] Preferably, the method of covering the patterned protective layer comprises printing protective ink or spraying photoresist.

[0077] Preferably, the etching solution includes a second acid solution, and the second acid solution includes at least one of nitric acid, sulfuric acid or hydrochloric acid and hydrofluoric acid.

[0078] As a preferred technical solution of the present invention, the processing and manufacturing method also includes step (5), which includes sequentially performing molding processing, edge processing, first cleaning and drying, strengthening processing, second cleaning and drying, surface treatment, and third cleaning and drying on the ultra-thin glass.

[0079] It should be noted that, in the processing and manufacturing method, if the ultra-thin glass is protected or covered during the processing and manufacturing process and has a protective layer, covering layer, protective layer, etc., it needs to be removed before the molding process.

[0080] Preferably, the molding process comprises providing a covering layer on the surface of the ultra-thin glass, curing the layer, and then cutting the edge of the layer after curing to form a target shape and size.

[0081] Preferably, the method of providing the cover layer comprises printing protective ink or spraying photoresist.

[0082] Preferably, the curing method includes UV irradiation and / or baking.

[0083] Preferably, the UV light energy is ≥1000mj / cm 2 , 1000mj / cm 2 、1300mj / cm 2 、1500mj / cm 2 、1800mj / cm 2 or 2000mj / cm2 wait.

[0084] In the present invention, in the processing and manufacturing method, after the covering layer is set and solidified, the overall light transmittance must still be maintained at ≥50% (white light). Complete lack of light transmittance or light transmittance that does not meet the requirements may result in the laser being unable to penetrate the product during subsequent edge cutting and unable to cut the product.

[0085] Preferably, the baking temperature is 50-90°C, such as 50°C, 60°C, 70°C, 80°C or 90°C, and the baking time is 10-60 min, such as 10 min, 20 min, 30 min, 40 min, 50 min or 60 min.

[0086] Preferably, the edge processing method includes immersing the ultra-thin glass in a third acid solution, so that the edges of the ultra-thin glass are chamfered.

[0087] Preferably, the third acid solution includes hydrofluoric acid, or at least one of nitric acid, sulfuric acid or hydrochloric acid and hydrofluoric acid; the concentration of the hydrofluoric acid is 1% to 10%, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%, and the concentration of the third acid solution is 1% to 25%, for example, 1%, 5%, 8%, 10%, 15%, 18%, 20%, 22% or 25%, etc.

[0088] Preferably, the immersion time in the third acid solution is 300 to 1200 s, for example, 300 s, 400 s, 500 s, 600 s, 700 s, 800 s, 900 s, 1000 s, 1100 s or 1200 s.

[0089] Preferably, the first cleaning and drying process includes cleaning with a weak alkaline cleaning agent with a concentration of 0.5% to 5%, for example, 0.5%, 1%, 2%, 3%, 4% or 5%, and then pre-treating the surface by alkali etching / or acid etching, with an etching amount between 0.5 and 5 μm, for example, 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm or 5 μm, and then soaking in pure water at 30 to 95°C, for example, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C or 95°C, for 5 to 60 minutes and then quickly drying, for example, 5 minutes, 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes or 60 minutes.

[0090] As a preferred technical solution of the present invention, the strengthening treatment method includes preheating the ultra-thin glass and then placing it in a molten mixed salt for ion exchange.

[0091] In the manufacturing method, preheating before ion exchange is performed to reduce the temperature difference between the ultra-thin glass and the molten salt mixture, while activating the surface ion activity, thereby making the product more stable in bending performance after strengthening. The ion exchange is a solid-phase reaction in the solid-phase molten salt mixture.

[0092] Preferably, the molten mixed salt includes at least one of KNO3, NANO3 or LiNO3.

[0093] Preferably, the molten mixed salt comprises 50% to 99.45% of K + , such as 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 99% or 99.45%, etc.; 0.5% to 35% Na + , such as 0.5%, 1%, 3%, 5%, 8%, 10%, 15%, 18%, 20%, 25%, 28%, 30%, 32% or 35%, and 0.05% to 15% Li + , for example 0.05%, 1%, 3%, 5%, 8%, 10%, 12% or 15%, etc.

[0094] In the manufacturing method, the ion exchange process preferably occurs + with Na + Exchange, Na + with Na + Exchange, Na + With LI + Exchange, etc. Since the ultra-thin glass described in the present invention is designed with unequal thickness, the expansion rates of the thick and thin areas of the product will be inconsistent after strengthening, which can easily lead to deformation and wrinkling of the product. To address this issue, the present invention adjusts the component ratios in the molten mixed salt so that under the same strengthening conditions, the expansion rate differences of different thickness areas can be reduced, thereby alleviating the wrinkling problem of the product.

[0095] Preferably, the ion exchange time is 3 to 50 min, for example, 3 min, 5 min, 10 min, 20 min, 30 min, 40 min, 50 min or 60 min, and the temperature is 360 to 410°C, for example, 360°C, 370°C, 380°C, 390°C, 400°C or 410°C.

[0096] Preferably, after the strengthening treatment, the surface stress CS value of the ultra-thin glass is 200-900 MPa, for example, 200 MPa, 300 MPa, 400 MPa, 500 MPa, 600 MPa, 700 MPa, 800 MPa or 900 MPa, and the internal stress layer depth DOL value is 3-12 μm, for example, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm or 12 μm, etc.

[0097] Preferably, the second cleaning and drying process includes cleaning with a weak alkaline cleaning agent with a concentration of 0.5% to 5%, for example, 0.5%, 1%, 2%, 3%, 4% or 5%, etc., in pure water at 30 to 95°C, for example, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C or 95°C, etc., soaking for 5 to 60 minutes and then quickly drying, for example, 5 minutes, 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes or 60 minutes.

[0098] Preferably, the surface treatment method includes immersing the ultra-thin glass in a fourth acid solution or a strong alkali solution to remove microcracks generated by the strengthening treatment.

[0099] Preferably, the fourth acid solution includes at least one of hydrofluoric acid, nitric acid, sulfuric acid or hydrochloric acid.

[0100] Preferably, the temperature of the fourth acid solution is 15-30°C, for example, 15°C, 18°C, 20°C, 23°C, 28°C or 30°C.

[0101] Preferably, the concentration of the strong alkaline solution is 30% to 80%, for example, 30%, 40%, 50%, 60%, 70% or 80%, and the temperature is 50 to 120°C, for example, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C or 120°C.

[0102] Preferably, the surface treatment causes the ultra-thin glass to remove a surface thickness of 0.1 to 3 μm, for example, 0.1 μm, 0.5 μm, 0.8 μm, 1 μm, 1.3 μm, 1.5 μm, 1.8 μm, 2 μm, 2.3 μm, 2.5 μm, 2.8 μm or 3 μm, etc., indicating that the stress removal amount is 50 to 250 MPa, for example, 50 MPa, 80 MPa, 100 MPa, 130 MPa, 150 MPa, 180 MPa, 200 MPa, 230 MPa or 250 MPa, etc.

[0103] Preferably, the third cleaning and drying process includes ultrasonic cleaning followed by rapid drying.

[0104] Compared with the existing technical solutions, the present invention has at least the following beneficial effects:

[0105] Compared with conventional ultra-thin glass that can only be folded once, the utility model realizes the multi-folding or rolling function of ultra-thin glass by setting multiple folding areas, filling the gap in the field.

[0106] The ultra-thin glass of the present invention realizes a smooth buffer transition or gradient buffer transition between the folding area and the non-folding area through a slope transition structure, that is, it is not a sudden transition structure, which effectively improves the use stability of the multi-fold ultra-thin glass.

[0107] The present invention effectively improves the product's impact resistance by creating a uniformly distributed patterned structure in the folding area, i.e., the area where the ultra-thin glass folds or curls. It can also effectively reduce the impact of post-processing steps such as strengthening of the ultra-thin glass during the manufacturing process on the product's expansion and appearance. Compared with unpatterned ultra-thin glass, the strength is effectively increased by at least 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0108] Figure 1 1-1 to 1-4 are schematic cross-sectional views of the ultra-thin glasses obtained in Examples 1-1 to 1-4;

[0109] Figure 2 Schematic diagram of the evolution of the glass body in the processing and manufacturing method of ultra-thin glass described in Example 1-1;

[0110] Figure 3 Schematic diagram of the evolution of the glass body in the processing and manufacturing method of the ultra-thin glass described in Examples 1-2;

[0111] Figure 4 Schematic diagram of the evolution of the glass body in the processing and manufacturing method of the ultra-thin glass described in Examples 1-3;

[0112] Figure 5 Schematic diagram of the evolution of the glass body in the processing and manufacturing method of the ultra-thin glass described in Examples 1-4;

[0113] Figure 6 is an enlarged view of the second folding region in the ultra-thin glass obtained in Example 5;

[0114] Figure 7 2-1 to 2-4 are schematic cross-sectional views of the ultra-thin glasses obtained in Example 2-1 to Example 2-4;

[0115] Figure 8 3-1 and 3-4 are schematic cross-sectional views of the ultra-thin glass obtained from Examples 3-1 and 3-4;

[0116] Figure 9 4-1 to 4-4 are schematic cross-sectional views of the ultra-thin glasses obtained;

[0117] Figure 10 5-1 to 5-4 are schematic cross-sectional views of the ultra-thin glasses obtained in Example 5-1 to Example 5-4;

[0118] Figure 11 is a schematic diagram of the glass body being fixed on the hollow lining plate in Examples 1-4;

[0119] Figure 12 Schematic diagram of chamfering the edge of the ultra-thin glass obtained by the present invention;

[0120] Figure 13 Schematic diagram of the rolling of a folding screen formed of the ultra-thin glass obtained in Example 1-1;

[0121] Figure 14 Schematic diagram of rolling and folding a folding screen formed of the ultra-thin glass obtained in Example 1-2;

[0122] Figure 15 is a schematic diagram of folding a folding screen formed of the ultra-thin glass obtained in Examples 1-3;

[0123] Figure 16 This is a schematic diagram of folding a folding screen formed of three-fold ultra-thin glass provided by the present invention;

[0124] Figure 17 This is a schematic diagram of folding a folding screen formed of four-fold ultra-thin glass provided by the present invention;

[0125] In the figure, F1-first folding area, F2-second folding area, N1-first non-folding area, N2-second non-folding area, N3-third non-folding area. DETAILED DESCRIPTION

[0126] The technical solution of the present utility model is further illustrated below through specific implementation methods.

[0127] Those skilled in the art should understand that the embodiments are only intended to help understand the present invention and should not be considered as specific limitations of the present invention.

[0128] [Example 1-1]

[0129] This embodiment provides an ultra-thin glass, such as Figure 1As shown, it includes a glass body, and one side surface of the glass body is provided with a first folding area F1, a first non-folding area N1 and a second folding area N2 connected in sequence; the folding areas all have a slope transition structure, through which the slope transition structure and the non-folding area are buffered and transitioned, and the slope transition structure is a fully linear slope; the outer contour of each folding area is a semi-groove; in the folding area, the thickness of the glass body except the slope transition structure is 30 μm, and the thickness of the glass body in the non-folding area is 100 μm; in the folding area, the surface of the glass body except the slope transition structure is formed with a patterned structure, and the patterned structure is an array of etched bumps, and the shape of the etched bumps is a hemisphere; the edge of the ultra-thin glass is chamfered, wherein the depth of the chamfered edge of the folding area is 60 μm and the width is 15 μm, and the depth of the chamfered edge of the non-folding area is 60 μm and the width is 85 μm, and the length and width of the ultra-thin glass are reduced by 0.08 mm after chamfering;

[0130] Illustratively, the processing and manufacturing method of the ultra-thin glass described in this embodiment includes:

[0131] (1) Carry out material cutting, thinning, cutting, pre-cleaning, protection, fixing and shaping in sequence:

[0132] A raw glass having a length of 600 mm, a width of 400 mm, and a thickness of 500 μm was obtained, the thicker raw glass was thinned to a thickness of 200 μm, and the thinned raw glass was cut into smaller set sizes (length 200 mm, width 100 mm) using laser cutting. The glass was then pre-cleaned, including cleaning with a weak alkaline detergent having a concentration of 3%, and then soaked in pure water at 65° C. for 35 minutes, and then quickly dried to obtain a glass body;

[0133] One side of the glass body is protected by printing protective ink, so that the protected side with the protective layer is entirely a non-plastic area, and the other unprotected side has an area to be shaped; the protected side is bonded to a liner with tape, so that the other side of the glass body with the area to be shaped is exposed to the outside world, thereby obtaining a fixed body;

[0134] One end of the fixed body is inserted into the shaping liquid until the liquid level reaches the initial position of the first plastic region (corresponding to the first folding region) on the glass body. The shaping liquid is a first acid solution composed of hydrofluoric acid and sulfuric acid, and its etching rate on the glass body is 5 μm / min, and the folding region begins to form.

[0135] (2) Manufacturing transition structure:

[0136] Keeping the position of the glass body unchanged, the shaping liquid is immediately and continuously added to the container storing the shaping liquid through the metering pump, so that the liquid level of the shaping liquid in the container continuously and evenly rises, so that the liquid surface of the shaping liquid and the surface of the glass body move relative to each other at a uniform speed until the liquid surface reaches the end position of the first area to be shaped. This is one relative movement process. The shaping liquid is quickly discharged until the liquid surface drops to the initial position of the first area to be shaped. This relative movement is repeated 25 times to obtain the first folding area F1.

[0137] (3) Complete shaping:

[0138] like Figure 2 As shown, the fixed body is taken out and turned over, and steps (1) and (2) are repeated, and the other end of the fixed body is inserted into the shaping liquid, and shaping is performed in the second plasticizing area (corresponding to the second folding area F2) until the second folding area F2 is obtained;

[0139] Go directly to step (5) without step (4);

[0140] (5) Carry out molding treatment, edge treatment, first cleaning and drying, strengthening treatment, second cleaning and drying, surface treatment and third cleaning and drying in sequence:

[0141] Molding process: Remove the liner and protective layer, print acid-resistant ink on one side of the ultra-thin glass to form a covering layer, and bake it at 70°C for 35 minutes to cure. Use the same method to form and cure another covering layer on the other side. At this time, maintain the light transmittance of the entire product at ≥50% (white light), and use laser cutting to remove the edge of the product to form the required shape and size.

[0142] Edge treatment: Immerse the ultra-thin glass in a third acid solution for 800 seconds, wherein the third acid solution comprises 3% hydrofluoric acid and 12% hydrochloric acid, and the total concentration of the third acid solution is 15%; the width of the edge chamfer of the folding area is reduced to 30 μm, and the thickness is reduced by 12 μm; the width of the edge chamfer of the non-folding area is reduced to 30 μm, and the thickness is reduced by 12 μm;

[0143] First cleaning and drying: After cleaning with a 2% weak alkaline detergent, the surface is pretreated by acid etching with an etching depth of 1μm. Then, it is immersed in pure water at 65℃ for 40min and quickly dried.

[0144] Strengthening treatment: After preheating the ultra-thin glass, place it in a molten mixed salt and perform ion exchange at 390°C for 25 minutes; the molten mixed salt includes KNO3, NANO3 or LiNO3. Based on the concentration of metal cations as 100%, the molten mixed salt includes 78% K + , 14% Na + and 8% Li+ After strengthening treatment, the surface stress CS value of ultra-thin glass is 200-900 MPa, and the depth of the internal stress layer DOL value is 3-12 μm;

[0145] Second cleaning and drying: After cleaning with a 2% weak alkaline detergent, soak in 65°C pure water for 40 minutes and then quickly dry;

[0146] Surface treatment: The ultra-thin glass is immersed in a fourth acid solution, wherein the fourth acid solution is hydrofluoric acid and the temperature of the fourth acid solution is 15-30°C to remove microcracks generated by the strengthening treatment; the surface treatment removes 0.4 μm of stress from the surface of the ultra-thin glass, indicating a stress removal of 50-250 MPa;

[0147] Third cleaning and drying: Use ultrasonic cleaning and then dry quickly.

[0148] [Example 1-2]

[0149] This embodiment provides an ultra-thin glass, such as Figure 1 As shown, one side surface of the glass body is provided with a first folding area F1, a first non-folding area N1, a second folding area F2 and a second non-folding area N2 connected in sequence; the contour shape of the second folding area F2 is a trapezoidal groove composed of two opposite slope transition structures;

[0150] That is, illustratively, in step (3) of the method for preparing ultra-thin glass, Figure 3 As shown, repeat steps (1) and (2), take out the fixed body and turn it around, extend the other end of the fixed body into the shaping liquid, and shape it in the second area to be plasticized (corresponding to the second folding area F2), to obtain a slope transition structure of the second folding area F2; take out the fixed body again and turn it around, repeat steps (1) and (2), extend the other end of the fixed body into the shaping liquid for shaping, to obtain another slope transition structure of the second folding area F2, and form the second folding area F2;

[0151] Except for the above, other conditions are exactly the same as those in Example 1-1.

[0152] [Examples 1-3]

[0153] This embodiment provides an ultra-thin glass, such as Figure 1 As shown, one side surface of the glass body is provided with a third non-folding area N3, a first folding area F1, a first non-folding area N1, a second folding area F2 and a second non-folding area N2 which are connected in sequence; the contours of the first folding area F1 and the second folding area F2 of the glass body are both trapezoidal grooves composed of two opposite slope transition structures;

[0154] That is, for example, Figure 4 As shown, when the preparation method of the ultra-thin glass initially completes step (1) and step (2), a slope transition structure of the first folding area F1 is obtained. In step (3), the fixed body is taken out and turned over, and steps (1) and (2) are repeated. The other end of the fixed body is inserted into the shaping liquid for shaping, thereby obtaining another slope transition structure of the first folding area F1. The processing and manufacturing method of the second folding area F2 is the same as that of Example 1-2.

[0155] Except for the above, other conditions are exactly the same as those in Example 1-1.

[0156] [Examples 1-4]

[0157] This embodiment provides an ultra-thin glass, such as Figure 1 As shown, the double-sided surfaces of the glass body are provided with a third non-folding area N3, a first folding area F1, a first non-folding area N1, a second folding area F2 and a second non-folding area N2 which are connected in sequence; and the contours of the first folding area F1 and the second folding area F2 are both trapezoidal grooves composed of two opposite slope transition structures;

[0158] That is, illustratively, in step (1) of the method for preparing the ultra-thin glass, the protection is not performed, and a hollow lining plate is used to fix the glass body, such as Figure 11 As shown, both sides of the glass body are exposed to the outside world; and the processing and preparation of the groove are the same as in Examples 1-3, and the evolution process of the glass body is as follows Figure 5 As shown;

[0159] Except for the above, other conditions are exactly the same as those in Example 1-1.

[0160] [Example 2-1 to Example 2-4]

[0161] like Figure 7 As shown, the ultra-thin glasses of Examples 2-1 to 2-4 correspond to the number and position of the folding areas and the non-folding areas in the ultra-thin glasses of Examples 1-1 to 1-4, respectively, and the only difference is the form of the slope transition structure. In Examples 2-1 to 2-4, the slope transition structure is an S-shaped slope (a chamfered straight slope), and the corresponding groove is a chamfered trapezoidal groove.

[0162] That is, illustratively, step (2) of the processing and manufacturing method of the ultra-thin glass is to keep the liquid level position of the shaping liquid unchanged, and by lowering the position of the glass body, the liquid level of the shaping liquid and the surface of the glass body are moved relative to each other at a uniform speed until the liquid level reaches the end position of the area to be shaped, which is a process of 1 relative movement, and the shaping liquid is quickly discharged until the liquid level drops to the initial position of the area to be plasticized, and the relative movement is repeated 5 times; and during each relative movement, pure water is sprayed above the liquid level of the shaping liquid, the spray interval is controlled to be 160s, and the spray flow rate is 80mL, forming an S-shaped slope. Except for the above, the processing and manufacturing methods of the ultra-thin glass of Examples 2-1 to 2-4 are the same as Examples 1-1 to 1-4, respectively.

[0163] [Example 3-1 to Example 3-4]

[0164] like Figure 8 As shown, the ultra-thin glasses of Examples 3-1 to 3-4 correspond to the number and position of the folding areas and the non-folding areas in the ultra-thin glasses of Examples 1-1 to 1-4, respectively, and the only difference is the form of the slope transition structure. In Examples 3-1 to 3-4, the slope transition structure is an arc-shaped slope, and the corresponding groove is an arc-shaped groove;

[0165] That is, illustratively, step (2) of the processing and manufacturing method of the ultra-thin glass is to keep the position of the glass body unchanged, and immediately add the shaping liquid to the container storing the shaping liquid through a metering pump, so that the liquid level of the shaping liquid in the container rises continuously and evenly, so that the liquid surface of the shaping liquid and the surface of the glass body move relative to each other at a uniform speed until the liquid level reaches the end position of the area to be shaped, which is a process of one relative movement, and quickly discharge the shaping liquid until the liquid level drops to the initial position of the area to be plasticized, and repeat the relative movement once; and during each relative movement, pure water is sprayed above the liquid surface of the shaping liquid, and the spray interval is controlled to be 30s, and the spray flow rate is 400mL to form an arc-shaped slope. Except for the above, the processing and manufacturing methods of the ultra-thin glass of Examples 3-1 to 3-4 are the same as those of Examples 1-1 to 1-4.

[0166] [Example 4-1 to Example 4-4]

[0167] like Figure 9 As shown, the ultra-thin glasses of Examples 4-1 to 4-4 correspond to the number and position of the folding areas and the non-folding areas in the ultra-thin glasses of Examples 1-1 to 1-4, respectively, and the only difference is the form of the slope transition structure. In Examples 4-1 to 4-4, the slope transition structure is a stepped slope, and the corresponding groove is a trapezoidal groove with a stepped structure on the trapezoidal side.

[0168] That is, illustratively, step (2) of the processing and manufacturing method of the ultra-thin glass is to set an interval period during each relative movement, and the relative movement does not occur during the movement interval period. Except for the above, the processing and manufacturing methods of the ultra-thin glass of Examples 4-1 to 4-4 are the same as those of Examples 1-1 to 1-4, respectively.

[0169] [Example 5-1 to Example 5-4]

[0170] like Figure 10 As shown, the ultra-thin glasses of Examples 5-1 to 5-4 correspond to the number and position of the folding areas and the non-folding areas in the ultra-thin glasses of Examples 1-1 to 1-4, respectively. The only difference is the form of the transition structure. In Examples 5-1 to 5-4, the transition structure uses a vertical transition structure instead of a slope transition structure (a full linear slope), and the corresponding groove is a rectangular groove.

[0171] That is, step (2) of the processing and manufacturing method of ultra-thin glass is to maintain the position of the liquid surface of the shaping liquid and the position of the glass body unchanged, so that the liquid surface of the shaping liquid and the surface of the glass body do not move relative to each other. Except for the above, the processing and manufacturing methods of the ultra-thin glass of Examples 5-1 to 5-4 are the same as those of Examples 1-1 to 1-4, respectively.

[0172] [Example 6]

[0173] The number, position, and contour shape of the folding area and the non-folding area in the ultra-thin glass of Example 6 are the same as those of Examples 1-3, and a patterned structure is provided in the folding area of Example 6;

[0174] That is, illustratively, the method for manufacturing ultra-thin glass further includes step (4) of manufacturing a patterned structure, and step (4) includes:

[0175] In the folding area, a patterned protective layer is covered on the surface of the glass body except for the slope transition structure by spraying photoresist, wherein the patterned protective layer includes protection points arranged in an array and uncovered areas between the protection points, and the shape of the protection points arranged in an array is circular; the uncovered areas are etched using an etching liquid, wherein the etching liquid is a second acid liquid, and the second acid liquid includes nitric acid and hydrofluoric acid. After the etching is completed, the protection points are removed by ultraviolet light irradiation and / or strong alkaline solution cleaning to obtain etched bumps, thereby forming a patterned structure, such as Figure 6 As shown;

[0176] Except for the above, the processing and manufacturing method of the ultra-thin glass of Example 5 is the same as that of Examples 1-3.

[0177] [Example 7]

[0178] The number, position and contour shape of the folding areas and non-folding areas in the ultra-thin glass of Example 7 are the same as those of Examples 1-3, but no surface treatment is performed in step (5) of the processing and manufacturing method of the ultra-thin glass. Except for the above, other conditions are exactly the same as those of Examples 1-3.

[0179]

Impact resistance test

[0180] In each example and comparative example, the same batch of ultra-thin glass was produced on a large scale and subjected to impact resistance testing. The impact resistance was evaluated using a pen drop test (pen specification: 12.8g / 0.5mm). The pen was dropped vertically with the tip pointing downward, and the maximum height at which the glass did not break was recorded. The results are recorded in Table 1.

[0181]

Bending pass rate test

[0182] 100 pieces of ultra-thin glass from the same batch of Examples 1-3, 2-3, 3-3, 4-3, 5-3, 6, and 7 were tested for a bending pass rate. Both folding areas were subjected to simulated book-turning dynamic folding. A folding rate of 200,000 or more was considered a passing rate. The folding speed was controlled to be one fold per 1 to 2 seconds, and the folding radius R was 1.0 mm. The test results are recorded in Table 1.

[0183] Table 1

[0184] Ultra-thin glass Surface treatment transition structure The outline shape of the folding area Maximum height Bending pass rate Examples 1-3 yes Fully straight slope Trapezoidal groove 6cm 96％ Example 2-3 yes S-shaped slope Chamfered trapezoidal groove 6cm 97％ Example 3-3 yes Arc-shaped slope Arc-shaped groove 6cm 95％ Example 4-3 yes stepped slope Trapezoidal groove with stepped sides 6cm 97％ Example 5-3 yes Vertical transition structure Rectangular groove 6cm 94％ Example 6 yes Fully straight slope Trapezoidal groove + patterned structure 8cm 95％ Example 7 no Fully straight slope Trapezoidal groove 6cm 62％

[0185] As can be seen from Table 1, after comparing the obtained ultra-thin glass, it was found that the bending performance was significantly improved after the surface treatment process after strengthening, and the bending pass rate was increased by 50% compared with the product without the surface treatment process; the various transition zone morphologies had no obvious effect on the bending performance; by making patterns in the folding area, the impact strength of the product pattern area can be effectively improved, and the impact strength can be increased by more than 30%.

[0186] The ultra-thin glass obtained in Example 1-1, Example 1-2 and Example 1-3 is used to make a folding screen, and the obtained folding screen is folded and / or rolled. The obtained schematic diagrams are shown in FIG. Figure 13 、 Figure 14 and Figure 15 As shown in the figure, the thick black straight line represents the outer side of the screen, and the other side surface opposite to the outer side of the screen is the inner side of the screen (applicable to Figure 16 and Figure 17 );in, Figure 13 The two folding areas of the folding screen are curled. Figure 14 One of the two folding areas of the folding screen is folded and the other is curled. Figure 15 The two folding areas of the folding screen are both folded, that is, double folded; further, two or more folding areas can be further provided in the ultra-thin glass to form a Figure 16 The tri-fold screen shown or Figure 17 The four-fold folding screen shown. It can be seen that the ultra-thin glass of the present invention has multiple folding areas, which can realize the multi-folding or rolling function of the ultra-thin glass, filling the gap in the field.

[0187] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0188] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0189] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An ultra-thin glass, characterized in that: It includes a glass body, and the surface of at least one side of the glass body includes a non-folding area and a folding area connected to each other, and the folding area has a transition structure and transitions to the non-folding area through the transition structure; on the same side surface of the glass body, the number of the folding areas is at least two.

2. The ultra-thin glass according to claim 1, characterized in that The transition structure includes a vertical transition structure and / or a slope transition structure.

3. The ultra-thin glass according to claim 2, characterized in that: The contour shape of the slope transition structure includes straight lines and / or curves; the slope transition structure includes any one of a fully straight slope, a stepped slope, an S-shaped slope or an arc-shaped slope.

4. The ultra-thin glass according to claim 2, characterized in that The folding zone includes two opposite transition structures, so that the contour shape of the folding zone is a groove.

5. The ultra-thin glass according to claim 1, characterized in that A patterned structure is formed on the surface of the glass body in the folding area.

6. The ultra-thin glass according to claim 5, characterized in that In the folding area, the surface of the glass body except the transition structure forms the patterned structure; the patterned structure includes etched bumps arranged in an array; the shape of the etched bumps includes any one of a hemisphere, a semi-ellipsoid or a polyhedron.

7. The ultra-thin glass according to claim 1, characterized in that: The thickness of the glass body in the folding area is smaller than the thickness of the glass body in the non-folding area; the thickness of the glass body in the non-folding area is the same or different.

8. The ultra-thin glass according to claim 1 or 7, characterized in that: In the folding area, the thickness of the glass body except the transition structure is 20-50 μm; the thickness of the glass body in the non-folding area is 70-250 μm.

9. The ultra-thin glass according to claim 1, wherein: The edges of the ultra-thin glass are chamfered; the length and width of the ultra-thin glass after chamfering are reduced by 0.01~0.1mm; the depth of the chamfered edge of the folding area is 25~100μm, and the width is 5~40μm; the depth of the chamfered edge of the non-folding area is 25~100μm, and the width is 50~200μm.

10. A folding screen, characterized in that: Contains the ultra-thin glass according to any one of claims 1 to 9.

Images