Shadow-free unequal-thickness ultrathin glass as well as preparation method and application thereof

Abstract

The invention discloses shadow-free non-uniform-thickness ultra-thin glass and a preparation method and application thereof.The shadow-free non-uniform-thickness ultra-thin glass comprises an ultra-thin glass body, the ultra-thin glass body is provided with a first surface and a second surface which are oppositely arranged and parallel to each other, and at least one arc-shaped groove is formed in the first surface; and the edge parts, adjacent to the first surface, of all the arc-shaped grooves are in smooth transition with the first surface. The shadow-free non-uniform-thickness ultra-thin glass comprises an ultra-thin glass body, the shadow-free non-uniform-thickness ultra-thin glass is characterized in that the edge part of the arc-shaped groove is in smooth transition with the first surface where the arc-shaped groove is located, and the shadow-free non-uniform-thickness ultra-thin glass is free of macroscopic offset shadow.

Description

Technical Field

[0001] The present application relates to the technical field of glass processing and molding, and in particular to an ultra-thin glass with non-uniform thickness and no light or shadow, and a preparation method and application thereof. Background Art

[0002] At present, the cover plates used in foldable screen mobile phones are mostly film materials and flexible foldable ultra-thin glass (UTG, UltraThin Glass). The film material will have obvious creases after being folded for a certain period of time. Although the flexible foldable ultra-thin glass has excellent bending resistance, it is too thin and has poor impact resistance and explosion resistance. There are currently two solutions to solve the above performance defects: one is to coat one or more layers of flexible resin material on the surface of UTG. The flexible resin material can not only protect the ultra-thin glass well, but also has no effect on the bending performance; the other is central foldable ultra-thin glass (CFG, CentralFoldable Glass), that is, the thickness of the glass in the middle bending area is only 30-50μm, and the thickness of the non-bending area is 70-200μm.

[0003] Since the middle part of CFG has the property of being bendable, there is a groove design in the middle part. The existence of the groove prevents CFG from being directly attached to the display panel, and the groove needs to be filled with flexible resin material. However, since the existing groove design has a boundary line between the slope and the flat area, it can still be seen by the naked eye even if the surface is covered with a layer of glue, affecting the visual effect of the display. In addition, the existing CFG preparation process is complex and costly, and it is not possible to etch multiple grooved ultra-thin glass sheets at one time. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the above-mentioned technology at least to some extent.

[0005] In view of this, an object of the present application is to provide an ultra-thin glass with non-uniform thickness and no light and shadow, in which the edge of the arc-shaped groove smoothly transitions with the first surface where it is located, and there is no visible light and shadow.

[0006] Another object of the present application is to provide a fixture.

[0007] Another object of the present application is to provide a method for preparing ultra-thin glass with non-uniform thickness and without light or shadow.

[0008] Another object of the present application is to provide an ultra-thin glass cover plate with unequal thickness.

[0009] Another object of the present application is to provide a method for preparing an ultra-thin glass cover plate of unequal thickness.

[0010] Another object of the present application is to provide an electronic device.

[0011] To achieve the above-mentioned objectives, the first aspect embodiment of the present application proposes a non-uniform thickness ultra-thin glass without light and shadow, comprising an ultra-thin glass body, wherein the ultra-thin glass body has a first surface and a second surface that are relatively arranged and parallel to each other, and at least one arc-shaped groove is provided on the first surface; the edge portions of all the arc-shaped grooves adjacent to the first surface have a smooth transition with the first surface.

[0012] In some embodiments, the area of ​​all the arc-shaped grooves accounts for 70-100% of the total area of ​​the first surface.

[0013] In some embodiments, the arc-shaped groove is a circular arc-shaped groove, and the radius of curvature of the arc-shaped groove, the minimum distance between the arc-shaped groove and the second surface, the chord length of the arc-shaped groove, and the distance between the second surface and the first surface meet the following relationship:

[0014] T=R+J-SQR(R 2 -x 2 ),

[0015] Wherein, T is the distance between the second surface and the first surface, in μm; J is the minimum distance between the arc-shaped groove and the second surface, in μm; R is the radius of curvature of the arc-shaped groove, in μm; x is the chord length of the arc-shaped groove, in μm.

[0016] In some embodiments, the spacing between the first surface and the second surface is 70-200 μm.

[0017] In some embodiments, the distances between all the arc-shaped grooves and the second surface gradually decrease from the edge portion to the center portion of the arc-shaped groove.

[0018] In some embodiments, the minimum distance between all the arc-shaped grooves and the second surface is 30-40 μm.

[0019] In some embodiments, the number of the arc-shaped groove is 1, and it is located in the middle of the first surface.

[0020] To achieve the above-mentioned purpose, the second aspect embodiment of the present application proposes a jig for preparing the non-uniform thickness ultra-thin glass without light and shadow according to the embodiment of the present application, comprising a jig body, wherein the jig body has a third surface, and a plurality of protrusions and grooves are arranged on the third surface at intervals and continuously.

[0021] To achieve the above-mentioned purpose, a third aspect of the present application provides a method for preparing ultra-thin glass without light and shadow, comprising:

[0022] Attaching and fixing a large piece of ultra-thin glass body to the third surface of the fixture of the embodiment of the present application to obtain a large piece of ultra-thin glass body that has been attached;

[0023] The attached large piece of ultra-thin glass body is subjected to non-uniform etching in the etching solution to obtain a non-uniformly etched large piece of ultra-thin glass;

[0024] The non-uniformly etched large piece of ultra-thin glass is separated from the jig, and then laminate cutting, edge etching, laminate separation, and strengthening treatment are performed in sequence to obtain the non-uniform thickness ultra-thin glass without light and shadow.

[0025] In some embodiments, the large piece of ultra-thin glass body and the fixture are fixed together by acid-resistant glue.

[0026] In some embodiments, the method for preparing the non-uniform thickness ultra-thin glass without light and shadow further includes a step of first cleaning the surface of the attached large piece of ultra-thin glass before performing the non-uniform etching.

[0027] In some embodiments, the method of performing non-uniform etching on the attached large piece of ultra-thin glass body in the etching solution comprises: intermittently immersing the portions of the attached large piece of ultra-thin glass corresponding to the plurality of protrusions into the etching solution, and tossing the jig up and down at a preset speed each time the jig is immersed in the etching solution.

[0028] In some embodiments, the preset speed is 0.5-1.5 cm / min.

[0029] In some embodiments, the etching solution includes at least one of a hydrofluoric acid solution, a sodium hydroxide solution, and a potassium hydroxide solution.

[0030] In some embodiments, the method for preparing the non-uniformly-thick ultra-thin glass without light and shadow further includes a step of performing a second cleaning on the non-uniformly-etched large piece of ultra-thin glass and the jig before separating the non-uniformly-etched large piece of ultra-thin glass from the jig.

[0031] To achieve the above-mentioned objectives, the fourth aspect embodiment of the present application proposes a non-uniform thickness ultra-thin glass cover plate, including the non-uniform thickness ultra-thin glass without light and shadow of the embodiment of the present application, or the non-uniform thickness ultra-thin glass without light and shadow prepared by the preparation method of the non-uniform thickness ultra-thin glass without light and shadow of the embodiment of the present application.

[0032] In some embodiments, the ultra-thin glass cover plate of non-uniform thickness further includes:

[0033] a first coating disposed on the first surface;

[0034] A second coating layer is provided on the surface of all the arc-shaped grooves, and the second coating layer is integrally formed with the first coating layer.

[0035] In some embodiments, the material of the first coating layer and the second coating layer includes at least one of polyurethane and polyacrylate.

[0036] In some embodiments, the first coating and the first surface, the second coating and all the arc-shaped grooves are connected together by a coupling agent;

[0037] In some embodiments, a distance between a side of the first coating layer away from the second surface and the second surface is d1, a distance between a side of the second coating layer away from the second surface and the second surface is d2, and d1≧d2.

[0038] To achieve the above-mentioned object, a fifth embodiment of the present application proposes a method for preparing an ultra-thin glass cover plate of non-uniform thickness, comprising:

[0039] Attaching and fixing the second surface of the non-uniform thickness ultra-thin glass on a rigid substrate;

[0040] A first coating and a second coating are respectively formed on the first surface of the non-uniform thickness ultra-thin glass and the surfaces of the plurality of arc-shaped grooves.

[0041] To achieve the above-mentioned objectives, the sixth aspect embodiment of the present application proposes an electronic device, including the non-uniform ultra-thin glass without light and shadow according to the embodiment of the present application; or, the non-uniform ultra-thin glass without light and shadow prepared by the method for preparing the non-uniform ultra-thin glass without light and shadow according to the embodiment of the present application; or, the non-uniform ultra-thin glass cover plate of the embodiment of the present application; or, the non-uniform ultra-thin glass cover plate of the embodiment of the present application prepared by the method for preparing the non-uniform ultra-thin glass cover plate of the embodiment of the present application.

[0042] The non-uniform thickness ultra-thin glass without light and shadow in the embodiment of the present application can at least bring the following beneficial effects:

[0043] 1. The edge of the arc-shaped groove smoothly transitions to the first surface where it is located, without any visible light or shadow differences.

[0044] 2. The area of ​​all arc-shaped grooves accounts for 70-100% of the total area of ​​the first surface, which further makes the arc-shaped grooves and the first surface where they are located smoother and more seamless, and the junction is visually invisible. The overall thickness of the non-uniform thickness ultra-thin glass without light and shadow changes slowly, thereby better avoiding the difference in light and shadow.

[0045] 3. It can be widely used in the field of flexible displays, such as foldable screen mobile phones and other electronic devices.

[0046] The method for preparing the ultra-thin glass with non-uniform thickness without light and shadow, the ultra-thin glass cover plate with non-uniform thickness, the method for preparing the ultra-thin glass cover plate with non-uniform thickness, the electronic device, etc. of the embodiment of the present application all have at least the beneficial effects of the ultra-thin glass with non-uniform thickness without light and shadow in the embodiment of the present application, wherein:

[0047] The method for preparing the non-uniform thickness ultra-thin glass without light and shadow in the embodiment of the present application also has the following beneficial effects:

[0048] 1. Using the attached arc-shaped jig etching method can form a standard arc, making the shape of the groove easier to control.

[0049] 2. Use a large sheet of ultra-thin glass attached to a jig for single-sided etching. By pulling in the etching solution, the etching time of different areas on the large sheet of ultra-thin glass corresponding to the jig protrusions is controlled to achieve an uneven etching effect.

[0050] 3. The use of large sheets of ultra-thin glass for etching, stacking cutting, and stacking edge processing makes production efficiency higher.

[0051] When the non-uniform thickness ultra-thin glass without light and shadow is used to prepare the above-mentioned non-uniform thickness ultra-thin glass cover plate, the coating filling method is used to make the cover plate relatively flat, which is conducive to the subsequent screen pasting, and the coating can cover the light and shadow of the edge of the groove.

[0052] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0054] Figure 1 A side view of an ultra-thin glass with non-uniform thickness and without light shadows is shown as an exemplary embodiment of the present application.

[0055] Figure 2 This is a front view of an ultra-thin glass with non-uniform thickness and no light or shadow, shown as an exemplary embodiment of the present application.

[0056] Figure 3 A side view of an ultra-thin glass of unequal thickness without light shadows is shown as another exemplary embodiment of the present application.

[0057] Figure 4 The figure is a schematic diagram of the structure of a fixture shown as an exemplary embodiment of the present application.

[0058] Figure 5 A side view of an ultra-thin glass cover plate of unequal thickness is shown as an exemplary embodiment of the present application.

[0059] Figure 6 A side view of an ultra-thin glass cover plate of unequal thickness is shown as another exemplary embodiment of the present application.

[0060] Reference numerals:

[0061] 1-ultra-thin glass body; 101-first surface; 102-second surface; 2-arc-shaped groove; 3-jig body; 301-third surface; 3011-protrusion; 3012-groove; 4-first coating; 5-second coating; 6-recessed portion. DETAILED DESCRIPTION

[0062] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, but cannot be understood as limiting the present application.

[0063] Throughout the application, the disclosure of numerical ranges includes all values ​​within the entire range and disclosure of further subdivided ranges, including endpoints and subranges given within those ranges.

[0064] In the application, the raw materials, equipment, etc. involved, unless otherwise specified, are all raw materials and equipment that can be produced through commercial channels or known methods; the methods involved, unless otherwise specified, are all conventional methods.

[0065] The following describes an ultra-thin glass with non-uniform thickness, a fixture, and an ultra-thin glass cover with non-uniform thickness without light and shadow in an embodiment of the present application with reference to the accompanying drawings.

[0066] like Figure 1 and Figure 2 As shown, the non-uniform thickness ultra-thin glass without light and shadow in an embodiment of the present application includes an ultra-thin glass body 1, the ultra-thin glass body 1 has a first surface 101 and a second surface 102 that are oppositely arranged and parallel to each other, and at least one arc-shaped groove 2 is provided on the first surface 101; the edge portions of all arc-shaped grooves 2 adjacent to the first surface 101 have a smooth transition with the first surface 101.

[0067] The non-uniform thickness ultra-thin glass without light and shadow in the embodiment of the present application has a smooth transition between the edge of the arc-shaped groove and the first surface where it is located, and there is no light and shadow difference visible to the naked eye.

[0068] In some embodiments, the area of ​​all arc-shaped grooves 2 accounts for 70-100% of the total area of ​​the first surface 101, including but not limited to 70%, 75%, 80%, 85%, 90%, 95% or 100%. When the area of ​​all arc-shaped grooves accounts for the total area of ​​the first surface within the above range, the arc-shaped grooves and the first surface where they are located can have a smoother transition, the junction is visually invisible, and the overall thickness of the non-uniform thickness ultra-thin glass without light and shadow changes slowly, thereby better avoiding the discontinuity of light and shadow; if it is less than 70%, the slope of the transition zone of the groove edge is too large, which will cause the reflected light formed by the large discontinuity to be greatly different from the groove plane area.

[0069] It should be noted that, in the non-uniform thickness ultra-thin glass without light and shadow in the embodiment of the present application, the number of the arc-shaped grooves can be 1 or more than 2.

[0070] As an optional example, the number of the arc-shaped groove 2 is one, and it is disposed in the middle position of the first surface 101 (eg Figure 1-3 shown).

[0071] It can be understood that when the number of the arc-shaped grooves 2 is 1 and the area of ​​all the arc-shaped grooves 2 accounts for 100% of the total area of ​​the first surface 101, the structure of the non-uniform thickness ultra-thin glass without light and shadow in the embodiment of the present application is as follows: Figure 3 As shown, at this time, the first surface is completely occupied by the arc-shaped groove.

[0072] In some embodiments, the arc groove 2 is an arc groove, and the radius of curvature of the arc groove 2, the minimum distance between the arc groove 2 and the second surface 102, the chord length of the arc groove 2, and the distance between the second surface 102 and the first surface 101 meet the following relationship (1):

[0073] T=R+J-SQR(R 2 -x 2 ) Formula (1),

[0074] In formula (1), T is the distance between the second surface 102 and the first surface 101, in μm; J is the minimum distance between the arc groove 2 and the second surface 102, in μm; R is the radius of curvature of the arc groove 2, in μm; x is the chord length of the arc groove 2, in μm.

[0075] In some embodiments, the distance between the first surface 101 and the second surface 102 is 70-200 μm, including but not limited to 70 μm, 100 μm, 130 μm, 150 μm, 180 μm or 200 μm.

[0076] In some embodiments, the distances between all arc-shaped grooves 2 and the second surface 102 gradually decrease from the edge of the arc-shaped groove 2 to the center.

[0077] In some embodiments, the minimum spacing between all arc-shaped grooves 2 and the second surface 102 is 30-40 μm, including but not limited to 30 μm, 32 μm, 35 μm, 37 μm, 39 μm or 40 μm.

[0078] It can be understood that in the non-uniform thickness ultra-thin glass without light and shadow of the embodiment of the present application, the area between the first surface and the second surface is a plane area (also called a flat area), and the area between the arc-shaped groove and the second surface is an arc-shaped area. The spacing between the first surface 101 and the second surface 102 is also the thickness of the plane area, and the spacing between the arc-shaped groove 2 and the second surface 102 is also the thickness of the arc-shaped area. The spacing between all the arc-shaped grooves 2 and the second surface 102 gradually decreases from the edge of the arc-shaped groove 2 to the center, that is, the thickness of the arc-shaped area changes gradually from the flat area to the center area. The minimum spacing between the arc-shaped groove 2 and the second surface 102, that is, the spacing between the deepest part of the arc-shaped groove and the second surface, is also the minimum thickness of the arc-shaped area.

[0079] like Figure 4 As shown, the jig of the embodiment of the present application is used to prepare the non-uniform thickness ultra-thin glass without light and shadow of the embodiment of the present application, including a jig body 3, the jig body 3 has a third surface 301, and a plurality of protrusions 3011 and grooves 3012 are arranged on the third surface 301 at intervals and continuously.

[0080] Regarding the design of the jig, the jig design for the non-uniform thickness ultra-thin glass without light and shadow of the embodiment of the present application is as follows:

[0081] First, the curvature center of the arc-shaped groove of the ultra-thin glass is taken as the 0 point, the thickness direction is taken as the Y axis, and the area parallel to the plane is taken as the X axis. The expression of the arc is x 2 +y 2 =R 2 , y = TR-40, T is the thickness of the glass at a certain point, so T = R + 40-SQR (R 2 -x 2 ), if the depth of a certain point of the protrusion 3011 on the jig when the jig is lowered to the lowest point is h, the lowest point is h0, h0 / h=60 / (100-T), the thickness and depth are negatively correlated, it can be deduced that if an arc-shaped groove is to be etched, then the protrusion 3011 of the jig must also be arc-shaped, assuming that the most protruding point of the jig in the direction of the center of the circle is h0 as the center of the circle, the center of the circle to the most protruding point is the b axis, and the vertical direction is the a axis, then a 2 +(h+R1-h0) 2 =R1 2, Substitute h0 / h=60 / (100-T), and we get T=40-60(SQR(R1 2 -a 2 )-R1) / h0, because x is actually equal to the arc length, so x=arcsin(a / R1) / Π(ΠR1)=R1*arcsin(a / R1), substitute T=R+40-SQR[R 2 -(R1*arcsin(a / R1) 2 ], according to T = R + 40-SQR [R 2 -(R1*arcsin(a / R1)]=40-60(SQR(R1 2 -a 2 )-R1) / h0 to obtain the radius of curvature of the protrusion 3011 on the fixture, and then determine the chord length according to the width of the arc-shaped groove to be etched, thereby designing the shape of the fixture.

[0082] In some embodiments, the number of protrusions and grooves is not limited, but the number of protrusions must be at least greater than the number of arc-shaped grooves on the non-uniform thickness ultra-thin glass without light and shadow in the embodiment of the present application, so as to ensure that a plurality of non-uniform thickness ultra-thin glasses without light and shadow with a target number of arc-shaped grooves can be prepared using subsequent large sheets of ultra-thin glass bodies.

[0083] In some embodiments, the material of the fixture body includes but is not limited to at least one of acrylic, epoxy board, polytetrafluoroethylene, etc.

[0084] It should be noted that the fixture of the embodiment of the present application only needs to have a third surface, and the side surface opposite to the third surface can be a plane, a curved surface or other structural forms; the internal structure of the fixture body itself is not limited.

[0085] The method for preparing the non-uniform thickness ultra-thin glass without light and shadow in the embodiment of the present application comprises the following steps:

[0086] S101 , attaching and fixing a large piece of ultra-thin glass body 1 to the third surface 301 of the fixture of the embodiment of the present application to obtain an attached large piece of ultra-thin glass body 1 .

[0087] In the embodiments of the present application, "large sheets of ultra-thin glass" refers to glass with a size greater than 140*160 mm, a thickness of 70-200 μm, and can be cut into multiple 6-inch or 8-inch small sheets of ultra-thin glass.

[0088] In some embodiments, the large piece of ultra-thin glass body has a thickness of 70-200 μm, specifically a large piece of ultra-thin glass body having the first surface and the second surface.

[0089] In some embodiments, the large piece of ultra-thin glass body 1 and the fixture are fixed together by acid-resistant glue.

[0090] As a non-limiting example, the acid-resistant glue includes, but is not limited to, at least one of epoxy resin glue or hydroxy acrylate glue.

[0091] S102, non-uniformly etching the attached large piece of ultra-thin glass body 1 in an etching solution to obtain a non-uniformly etched large piece of ultra-thin glass.

[0092] In some embodiments, in order to avoid poor appearance during etching, the method for preparing non-uniform thickness ultra-thin glass without light and shadow also includes a step of first cleaning the surface of the attached large piece of ultra-thin glass before performing non-uniform etching.

[0093] As an optional example, the first cleaning method includes but is not limited to ultrasonic cleaning and the like.

[0094] The first cleaning ensures that the surface of the attached large piece of ultra-thin glass is clean.

[0095] As a non-limiting example, the cleaning solution of the first cleaning includes but is not limited to at least one of OP-10, K-12, etc.

[0096] In some embodiments, a method for performing non-uniform etching on a large attached piece of ultra-thin glass body in an etching solution comprises: intermittently immersing the portions of the large attached piece of ultra-thin glass corresponding to the plurality of protrusions 3011 into the etching solution, and tossing the jig up and down at a preset speed each time the jig is immersed in the etching solution.

[0097] It can be understood that the parts of the attached large piece of ultra-thin glass body corresponding to the plurality of grooves 3012 are always kept above the etching liquid level, that is, not immersed in the etching liquid.

[0098] Specifically, the cleaned ultra-thin glass body is placed in an etching tank, and the etching time of the portion deep below the etching liquid surface is long by tossing the glass body up and down, while the portion above the etching liquid surface is not etched, and the etching time of the portion below the etching liquid surface but unable to enter the deeper portion of the etching liquid below the etching liquid surface is short, so as to achieve the purpose of non-uniform etching.

[0099] It should be noted that the above-mentioned "up and down tossing" can also be moving up and down. Specifically, the movement toward the part close to the etching liquid surface is called upward tossing or upward movement, and the movement toward the part close to the bottom of the etching liquid is called downward tossing or downward movement. During each immersion etching process, the upward tossing and downward tossing are alternated and performed multiple times until the etching time is reached, and the entire process must ensure that the parts corresponding to the plurality of grooves 3012 on the attached large piece of ultra-thin glass body are always kept above the etching liquid surface, and at least part of the parts corresponding to the plurality of protrusions 3011 on the attached large piece of ultra-thin glass are located below the etching liquid surface.

[0100] In some embodiments, the preset speed is 0.5-1.5 cm / min, including but not limited to 0.5 cm / min, 0.7 cm / min, 1 cm / min, 1.3 cm / min or 1.5 cm / min. When the preset speed is within the above range, it can be ensured that the parts corresponding to the plurality of protrusions 3011 on the attached large piece of ultra-thin glass body gradually and slowly enter and move out of the etching liquid from the top of the protrusion to the side of the root close to the groove for immersion etching. The part closer to the top of the jig protrusion on the large piece of ultra-thin glass body has a longer immersion etching time, and the part closer to the groove has a shorter immersion etching time, thereby achieving non-uniform etching of the large piece of ultra-thin glass body. If the preset speed is too small (for example, less than 0.5 cm / min), the speed will be uneven due to equipment reasons, affecting the groove morphology; if the preset speed is too large (for example, greater than 1.5 cm / min), it is easy to cause the liquid surface to shake greatly due to the excessive throwing speed, forming etching lines on the ultra-thin glass.

[0101] In some embodiments, the etching solution includes but is not limited to at least one of hydrofluoric acid, sodium hydroxide solution, and potassium hydroxide solution.

[0102] As an optional example, the etching solution is a 10-20 wt % hydrofluoric acid solution.

[0103] As another optional example, the etching solution is a 40-60 wt % sodium hydroxide solution or a potassium hydroxide solution.

[0104] In some embodiments, the portions of the attached large piece of ultra-thin glass corresponding to the plurality of protrusions 3011 are immersed in etching liquid at a preset speed for more than 2 times, and the specific number of times is related to the depth and area of ​​the arc-shaped groove to be etched, and the length of the immersion etching time.

[0105] In some embodiments, each time the portion of the attached large piece of ultra-thin glass corresponding to the plurality of protrusions 3011 is immersed in the etching solution at a preset speed for 1-20 minutes, including but not limited to 1 minute, 5 minutes, 10 minutes, 15 minutes or 20 minutes.

[0106] As an optional example, the parts of the attached large piece of ultra-thin glass corresponding to the plurality of protrusions 3011 are immersed in etching liquid twice at a preset speed of 1 cm / min, and each immersion time is 10 minutes.

[0107] S103, separating the non-uniformly etched large piece of ultra-thin glass from the jig, and then sequentially performing layer cutting, edge etching, layer separation, and strengthening treatment to obtain non-uniformly thick ultra-thin glass without light and shadow.

[0108] In some embodiments, the method for preparing non-uniform thickness ultra-thin glass without light and shadow further includes a step of performing a second cleaning on the non-uniformly etched large piece of ultra-thin glass and the jig before separating the non-uniformly etched large piece of ultra-thin glass from the jig.

[0109] As an optional example, the second cleaning method includes but is not limited to ultrasonic cleaning and the like.

[0110] In some embodiments, methods for separating the non-uniformly etched large piece of ultra-thin glass from the jig include but are not limited to manual tearing or debonding tearing.

[0111] In some embodiments, the method of stacking and cutting includes: gluing together multiple large pieces of non-uniformly etched ultra-thin glass, and using laser cutting to separate them into small pieces. Products of the required shape and size can be cut out as needed, and unnecessary parts (such as partial flat areas) can also be removed.

[0112] It should be noted that the above-mentioned “aligned bonding” refers to placing the arc-shaped grooves formed at corresponding positions on each non-uniformly etched large piece of ultra-thin glass in correspondence with each other.

[0113] In some embodiments, the edge etching method includes: placing the cut piece of ultra-thin glass into an etching solution, and etching the edge into an arc-shaped edge.

[0114] It should be noted that the etching solution for edge etching may be the same as or different from the etching solution used for the above-mentioned non-uniform etching.

[0115] In some embodiments, the method for separating the stacked layers includes: separating the small pieces of ultra-thin glass stacked together by at least one of over-aging, reactive debonding, etc., and removing the adhesive layer.

[0116] Among them, over-aging refers to the use of a strong UV light source to age the adhesive layer, making it hard and easy to separate; reactive debonding refers to the reaction of polar groups in the adhesive layer (such as hydroxyl and carboxyl groups, polar groups provide adhesion) into other groups, causing it to lose adhesion to the glass and detach.

[0117] In some embodiments, the strengthening method includes: placing the ultra-thin glass into a potassium nitrate strengthening furnace for strengthening.

[0118] The non-uniform thickness ultra-thin glass cover plate of the embodiment of the present application includes the non-uniform thickness ultra-thin glass without light and shadow of the embodiment of the present application, or the non-uniform thickness ultra-thin glass without light and shadow prepared by the method for preparing the non-uniform thickness ultra-thin glass without light and shadow of the embodiment of the present application.

[0119] In some embodiments, Figure 5As shown, the non-uniform thickness ultra-thin glass cover plate further includes a first coating 4 and a second coating 5. The first coating 4 is disposed on the first surface 101; the second coating 5 is disposed on the surface of all arc-shaped grooves 2, and the second coating 5 and the first coating 4 are integrally formed.

[0120] It can be understood that in the embodiments of the present application, the first coating layer and the second coating layer are integrated, and are divided into the first coating layer and the second coating layer only for the convenience of description.

[0121] In some embodiments, the materials of the first coating 4 and the second coating 5 include but are not limited to at least one of polyurethane and polyacrylate, wherein the polyurethane includes but is not limited to at least one of polyether polyurethane, polyester polyurethane, polycarbonate polyurethane and the like.

[0122] In some embodiments, the first coating 4 and the first surface 101 , the second coating 5 and all the arc-shaped grooves 2 are connected together via a coupling agent.

[0123] In the embodiments of the present application, the coupling agent is not limited to a specific material, and can be any coupling agent in the field. As a non-limiting example, the coupling agent includes but is not limited to at least one of a silane coupling agent, a titanate coupling agent, and the like.

[0124] In some embodiments, the thickness of the first coating 4 is 15-40 μm, including but not limited to 15 μm, 20 μm, 25 μm, 30 μm, 35 μm or 40 μm.

[0125] In some embodiments, the thickness of the second coating 5 is 15-150 μm, including but not limited to 15 μm, 30 μm, 60 μm, 90 μm, 120 μm or 150 μm, etc.

[0126] In some embodiments, the distance between the first coating 4 away from the second surface 102 and the second surface 102 is d1, and the distance between the second coating 5 away from the second surface 102 and the second surface 102 is d2, d1≧d2

[0127] It is understandable that if Figure 5As shown, when d1>d2, the thickness of the first coating 4 is equal to the thickness of the second coating 5, or the thickness of the first coating 4 is less than the thickness of the second coating 5 and their thicknesses are both less than the depth of the arc-shaped groove. When the thickness of the first coating 4 is equal to the thickness of the second coating 5, since the second coating is arranged on the surface of the arc-shaped groove, and the arc-shaped groove is arranged on the first surface, therefore, no matter what the coating thickness is (greater than, equal to or less than the depth of the arc-shaped groove), for the non-uniform thickness ultra-thin glass cover itself, the side surface opposite to the second surface of the non-uniform thickness ultra-thin glass without light and shadow (the side surface of the first coating and the second coating away from the second surface) always has a concave portion 6 (i.e., a groove portion) that is concave toward the second surface at the position opposite to the arc-shaped groove. When the thickness of the first coating 4 is less than the thickness of the second coating 5 and their thicknesses are both less than the depth of the arc-shaped groove, the arc-shaped groove is not filled with the second coating 5, and the unfilled part constitutes the above-mentioned concave portion 6.

[0128] When d1=d2, Figure 6 As shown, the surfaces of the first coating 4 and the second coating 5 away from the second surface 102 are both arranged parallel to the second surface 102 .

[0129] The method for preparing the non-uniform thickness ultra-thin glass cover plate of the embodiment of the present application comprises the following steps:

[0130] S101, attaching and fixing the second surface 102 of the ultra-thin glass of unequal thickness onto a rigid substrate.

[0131] In some embodiments, the rigid substrate includes, but is not limited to, a metal plate, a glass plate, and the like.

[0132] In some embodiments, the attachment and fixing methods include but are not limited to adhesive bonding and the like.

[0133] S102, forming a first coating 4 and a second coating 5 on the first surface 101 of the ultra-thin glass of non-uniform thickness and the surfaces of the plurality of arc-shaped grooves 2, respectively.

[0134] In some embodiments, the methods of respectively forming the first coating 4 and the second coating 5 on the first surface 101 of the ultra-thin glass of non-uniform thickness and the surfaces of the plurality of arc-shaped grooves 2 include but are not limited to coating.

[0135] As an optional example, a coating is applied to the first surface 101 and the surfaces of several arc-shaped grooves 2 of ultra-thin glass of non-uniform thickness by slit coating or scraping, and after curing, a second coating is formed to fill the arc-shaped grooves and a first coating is formed on the first surface.

[0136] The non-uniform thickness ultra-thin glass without light shadows of the embodiment of the present application, the non-uniform thickness ultra-thin glass without light shadows prepared by the method for preparing the non-uniform thickness ultra-thin glass without light shadows of the embodiment of the present application, the non-uniform thickness ultra-thin glass cover plate of the embodiment of the present application, and the non-uniform thickness ultra-thin glass cover plate prepared by the method for preparing the non-uniform thickness ultra-thin glass cover plate of the embodiment of the present application can all be widely used in the field of flexible display.

[0137] The electronic device of the embodiment of the present application comprises the non-uniform ultra-thin glass without light and shadow of the embodiment of the present application; or, the non-uniform ultra-thin glass without light and shadow prepared by the method for preparing the non-uniform ultra-thin glass without light and shadow of the embodiment of the present application; or, the non-uniform ultra-thin glass cover plate of the embodiment of the present application; or, the non-uniform ultra-thin glass cover plate of the embodiment of the present application prepared by the method for preparing the non-uniform ultra-thin glass cover plate of the embodiment of the present application.

[0138] In some embodiments, electronic devices include but are not limited to mobile phones, tablet computers, etc., especially foldable screen mobile phones.

[0139] Certain features of the present technology are further illustrated in the following non-limiting examples.

[0140] Example 1

[0141] (Ultra-thin glass with non-uniform thickness and no light or shadow)

[0142] like Figure 1 and Figure 2 As shown, the non-uniform thickness ultra-thin glass without light and shadow of this embodiment comprises an ultra-thin glass body 1, wherein the ultra-thin glass body 1 has a first surface 101 and a second surface 102 which are arranged oppositely and parallel to each other, and the spacing between the first surface 101 and the second surface 102 is 100 μm. An arc-shaped groove 2 is provided in the middle of the first surface 101; the edge of the arc-shaped groove 2 adjacent to the first surface 101 smoothly transitions with the first surface 101. The area of ​​the arc-shaped groove 2 accounts for 70% of the total area of ​​the first surface 101; the arc-shaped groove 2 is a circular arc-shaped groove, and its curvature radius is 20833.3633 mm, and the chord length is 100 mm; the spacing between the arc-shaped groove 2 and the second surface 102 is gradually reduced from the edge of the arc-shaped groove 2 to the center, and the minimum spacing between the arc-shaped groove 2 and the second surface 102 is 40 μm.

[0143] (jigs)

[0144] like Figure 4 As shown, the jig of the embodiment of the present application includes a jig body 3, the jig body 3 has a third surface 301, and a plurality of protrusions 3011 and grooves 3012 are arranged at intervals and continuously on the third surface 301. The number of protrusions 3011 is 6, and the number of grooves 3012 is 5.

[0145] (Preparation method of non-uniform thickness ultra-thin glass without light and shadow)

[0146] The method for preparing the non-uniform thickness ultra-thin glass without light and shadow of this embodiment comprises the following steps:

[0147] S1: Attaching a large piece of ultra-thin glass: A large rectangular ultra-thin glass body with a length of 65 cm, a width of 55 cm, and a thickness of 100 μm is attached and fixed on the third surface 301 of the fixture of this embodiment using acid-resistant glue (for example, epoxy resin glue).

[0148] S2: Cleaning: Put the cleaned large piece of ultra-thin glass body into a cleaning machine, and clean it with a surfactant cleaning agent (for example, OP-10) as a cleaning liquid for use.

[0149] S3: Arc groove etching: The cleaned large piece of ultra-thin glass body is placed in an etching tank filled with 15wt% hydrofluoric acid etching solution, the etching area (i.e., protrusion 3011) on the jig is immersed in the etching solution, and the non-etching area (i.e., groove 3012) is above the etching solution surface. The jig is tossed at a speed of 1 cm / min. After the large piece of ultra-thin glass body has completely left the liquid surface, it is immersed in the etching solution at the same speed. After the etching area is completely immersed in the etching, the action is repeated. After 10 minutes (each immersion etching time is 5 minutes), a large piece of non-uniform thickness ultra-thin glass with an arc-shaped groove is obtained, with the thickest part (the distance between the first surface and the second surface) being 100 μm and the thinnest part (the minimum distance between the arc groove and the second surface) being 40 μm.

[0150] S4: Cleaning: Use ultrasonic cleaning to clean the large pieces of ultra-thin glass with non-uniform thickness and the etching solution on the fixture and set them aside.

[0151] S5: Separation: Use a debonding agent to separate large pieces of ultra-thin glass of non-uniform thickness from the fixture.

[0152] S6: Laminated cutting: glue multiple large pieces of etched ultra-thin glass of non-uniform thickness together with glue (the name of the glue is: Japanese electrochemical laminated glue), and use laser cutting to divide them into small pieces. Products of the size of ultra-thin glass of non-uniform thickness without light and shadow (for example, the size of the ultra-thin glass body is 148*122mm) can be cut out as needed.

[0153] S7: Edge processing (edge ​​etching): Put the cut piece of ultra-thin glass into a 10wt% hydrofluoric acid etching solution and etch for 30 seconds to etch the edge into an arc-shaped edge.

[0154] S8: Layer separation: Put the stacked pieces of ultra-thin glass into a UV machine at 4000mJ / cm 2 The energy is used for aging treatment to make the adhesive layer lose adhesion and separate.

[0155] S9: Strengthening: The ultra-thin glass obtained in step S8 is put into a potassium nitrate strengthening furnace, heated to 380°C at a heating rate of 5°C / min, maintained for 90 minutes, and then cooled to 50°C at a rate of 4°C / min, thereby obtaining the ultra-thin glass of non-uniform thickness without light or shadow of this embodiment.

[0156] (Ultra-thin glass cover with different thickness)

[0157] like Figure 5 As shown, the non-uniform thickness ultra-thin glass cover plate of this embodiment includes the non-uniform thickness ultra-thin glass without light and shadow of this embodiment, a first coating 4 is provided on the first surface 101, a second coating 5 is provided on the surface of the arc-shaped groove, and the second coating 5 is integrally formed with the first coating 4. The material of the first coating 4 and the second coating 5 are both BASF TPU 685A polyurethane coating with a solid content of 35wt%; the thickness of the first coating 4 is 40μm, and the thickness of the second coating 5 is 50μm.

[0158] (Method for preparing ultra-thin glass cover plates of non-uniform thickness)

[0159] The method for preparing the non-uniform thickness ultra-thin glass cover plate of this embodiment comprises the following steps:

[0160] S101, attaching: attaching the second surface 102 of the shadowless ultra-thin glass of non-uniform thickness prepared by the method for preparing the shadowless ultra-thin glass of non-uniform thickness in this embodiment to the rigid substrate glass by means of double-sided tape;

[0161] S102, coating and curing: Use a slit coater to evenly coat the first surface 101 and the arc groove 2 surface of the non-uniform thickness ultra-thin glass with a liquid film of 200 μm and a solid content of 35 wt%. After curing at 130° C. for 90 min, a non-uniform thickness ultra-thin glass cover plate ( Figure 5 shown).

[0162] Example 2

[0163] This embodiment is basically the same as Embodiment 1, except that:

[0164] like Figure 3 As shown, in the non-uniform thickness ultra-thin glass without light and shadow of this embodiment, the area of ​​the arc-shaped groove 2 accounts for 100% of the total area of ​​the first surface 101 (that is, the first surface forms an arc-shaped groove as a whole), the distance between the edge of the arc-shaped groove 2 and the second surface is 100μm, the curvature radius of the arc-shaped groove 2 is 35000.035mm, and the chord length is 140mm.

[0165] In the method for preparing the non-uniform thickness ultra-thin glass without light and shadow of this embodiment:

[0166] S3: Arc groove etching: The cleaned large piece of ultra-thin glass body is placed in an etching tank containing an etching solution of 15wt% hydrofluoric acid, the etching area (i.e., the protrusion 3111) on the jig is immersed in the etching solution, and the non-etching area (i.e., the groove 3012) is above the etching solution surface. The jig is tossed at a speed of 1 cm / min. After the large piece of ultra-thin glass body has completely left the liquid surface, it is immersed in the etching solution at the same speed. After the etching area is completely immersed in the etching, the action is repeated. After 10 minutes, a large piece of non-uniform thickness ultra-thin glass with an arc-shaped groove is obtained, with the thickest part (the distance between the edge of the arc groove and the second surface) being 100 μm and the thinnest part (the minimum distance between the arc groove and the second surface) being 40 μm.

[0167] S6: Stacking cutting: Multiple large pieces of etched ultra-thin glass of non-uniform thickness are glued together with glue (the name of the glue is: Japan Denka stacking glue), and they are divided into small pieces by laser cutting. Products of the size of ultra-thin glass of non-uniform thickness without light and shadow (for example, the size of the ultra-thin glass body is 15cm*14cm) can be cut out as needed, but without the flat areas on both sides of the arc-shaped groove.

[0168] In the non-uniform thickness ultra-thin glass cover plate of this embodiment, there is no first coating 4, and the thickness of the second coating 5 is not the same everywhere, but gradually increases from the edge of the arc-shaped groove to the center (the closest distance to the second surface), wherein the thickness of the second coating at the edge of the arc-shaped groove is 25 μm, and the thickness of the second coating at the center of the arc-shaped groove is 70 μm.

[0169] In the method for preparing the non-uniform thickness ultra-thin glass cover plate of this embodiment:

[0170] S102, coating and curing: Use a slit coater to evenly coat the first surface 101 and the arc-shaped groove 2 surface of the non-uniform thickness ultra-thin glass with a liquid film of 200 μm and a solid content of 35 wt%. After curing at 130° C. for 90 min, a non-uniform thickness ultra-thin glass cover with a thickness of 125 μm at the thickest part (the maximum distance from the side of the second coating 5 away from the second surface 102 to the second surface 102) and a thickness of 110 μm at the thinnest part (the minimum distance from the side of the second coating 5 away from the second surface 102 to the second surface 102) is obtained.

[0171] Example 3

[0172] This embodiment is basically the same as Embodiment 2, except that:

[0173] like Figure 3As shown, in the non-uniform thickness ultra-thin glass without light and shadow of this embodiment, the distance between the edge of the arc-shaped groove 2 and the second surface is 200 μm.

[0174] In the method for preparing the non-uniform thickness ultra-thin glass without light and shadow of this embodiment:

[0175] In S1, the thickness of the large piece of ultra-thin glass body is 200 μm;

[0176] S3: Arc groove etching: The cleaned large piece of ultra-thin glass body is placed in an etching tank containing an etching solution of 15wt% hydrofluoric acid, the etching area (i.e., the protrusion 3111) on the jig is immersed in the etching solution, and the non-etching area (i.e., the groove 3012) is above the etching solution surface. The jig is tossed at a speed of 1 cm / min. After the large piece of ultra-thin glass body has completely left the liquid surface, it is immersed in the etching solution at the same speed. After the etching area is completely immersed in the etching, the action is repeated. After 28 minutes (each immersion etching time is 14 minutes), a large piece of non-uniform thickness ultra-thin glass with an arc-shaped groove is obtained, with the thickest part (the distance between the edge of the arc groove and the second surface) being 200μm and the thinnest part (the minimum distance between the arc groove and the second surface) being 40μm.

[0177] In the non-uniform thickness ultra-thin glass cover plate of this embodiment, there is no first coating 4, and the thickness of the second coating 5 is not the same everywhere, but gradually increases from the edge of the arc-shaped groove to the center (the closest distance to the second surface), wherein the thickness of the second coating at the edge of the arc-shaped groove is 15 μm, and the thickness of the second coating at the center of the arc-shaped groove is 110 μm.

[0178] In the method for preparing the non-uniform thickness ultra-thin glass cover plate of this embodiment:

[0179] S102, coating and curing: Use a slit coater to evenly coat the first surface 101 and the arc-shaped groove 2 surface of the non-uniform thickness ultra-thin glass with a liquid film of 220 μm and a solid content of 35 wt%. After curing at 130° C. for 90 min, a non-uniform thickness ultra-thin glass cover with a thickest part (the maximum distance from the side of the second coating 5 away from the second surface 102 to the second surface 102) of 215 μm and a thinnest part (the minimum distance from the side of the second coating 5 away from the second surface 102 to the second surface 102) of 150 μm is obtained.

[0180] Example 4

[0181] This embodiment is basically the same as Embodiment 1, except that:

[0182] like Figure 6As shown, in the non-uniform thickness ultra-thin glass cover plate of this embodiment, the materials of the first coating 4 and the second coating 5 are both UV-type acrylate, specifically Changxing 65152 acrylate; the thickness of the first coating 4 is 20 μm, and the thickness of the second coating 5 is 80 μm, and the surfaces of the first coating 4 and the second coating 5 away from the second surface 102 are both arranged parallel to the second surface 102.

[0183] In the method for preparing the non-uniform thickness ultra-thin glass cover plate of this embodiment,

[0184] S102, coating and curing: Use a scraper to apply a layer of UV-type acrylic paint with a thickness of 100 μm and a solid content of 100 wt% on the first surface 101 of the non-uniform ultra-thin glass without light and shadow and the surface of the arc-shaped groove 2, and then use a roller press to roll the surface of the coating with a silicon-based release film (a colorless and transparent release film, such as Japan Fujimori 50E-0010KFAS, etc.). The gap between the roller of the roller press and the flat area of ​​the ultra-thin glass is 20 μm larger than the thickness of the release film. Use a mercury lamp curing machine to cure the coating with an energy of 2500 mJ / cm2. After curing, tear off the release film to obtain a non-uniform ultra-thin glass cover plate with a total surface thickness of 120 μm±10 μm (such as Figure 6 ).

[0185] Example 5

[0186] This embodiment is basically the same as Embodiment 1, except that:

[0187] In the non-uniform thickness ultra-thin glass without light and shadow of this embodiment, the minimum distance between the arc-shaped groove and the second surface is 30 μm.

[0188] Embodiment 6 (the number of arc-shaped grooves is multiple)

[0189] This embodiment is basically the same as Embodiment 1, except that:

[0190] In the non-uniform thickness ultra-thin glass without light and shadow of this embodiment, the number of the arc-shaped grooves is 3.

[0191] In the method for preparing the non-uniform thickness ultra-thin glass without light and shadow of the present embodiment, the laminated cutting in step S6 makes the size of the non-uniform thickness ultra-thin glass without light and shadow obtained by cutting be three times that of the first embodiment.

[0192] In the ultra-thin glass cover plate of non-uniform thickness in this embodiment, the surface of each arc-shaped groove is provided with a second coating 5 .

[0193] Example 7 (Lower speed limit of the throwing fixture)

[0194] This embodiment is basically the same as Embodiment 1, except that:

[0195] In the method for preparing ultra-thin glass without light and shadow of the present embodiment, the speed of the throwing jig in step S3 is 0.5 cm / min.

[0196] Example 8 (Upper limit of the speed of the throwing jig)

[0197] This embodiment is basically the same as Embodiment 1, except that:

[0198] In the method for preparing ultra-thin glass without light and shadow of the present embodiment, the speed of the throwing jig in step S3 is 1.5 cm / min.

[0199] Example 9

[0200] This embodiment is basically the same as Embodiment 1, except that:

[0201] In the non-uniform thickness ultra-thin glass cover plate of this embodiment, the first coating 4 and the first surface 101 , and the second coating 5 and the arc-shaped groove 2 are connected via the coupling agent KH550.

[0202] In the method for preparing the non-uniform thickness ultra-thin glass cover plate of this embodiment,

[0203] S102, coating and curing: Use a slit coater to evenly coat the first surface 101 and the arc groove 2 of the non-uniform thickness ultra-thin glass with no light and shadow with a coupling agent KH550 (thickness of 3 nm), and then coat a BASF TPU 685A polyurethane coating with a liquid film of 200 μm and a solid content of 35 wt%. After curing at 130° C. for 90 min, a non-uniform thickness ultra-thin glass cover plate ( Figure 5 shown).

[0204] Comparative Example 1

[0205] This comparative example is substantially the same as Example 7, except that:

[0206] In the method for preparing the non-uniform thickness ultra-thin glass without light and shadow of the present embodiment, the jig is not polished in step S3, and each time a large piece of ultra-thin glass is only statically immersed and etched.

[0207] Comparative Example 2 (throwing speed is too fast, exceeding the upper limit of this application)

[0208] This comparative example is basically the same as Example 1, except that:

[0209] In the method for preparing ultra-thin glass without light and shadow of the present embodiment, the throwing speed of the jig in step S3 is 3 cm / min.

[0210] Comparative Example 3

[0211] This comparative example is basically the same as Example 1, except that:

[0212] In the preparation method of the non-uniform thickness ultra-thin glass without light and shadow of this comparative example, the groove is formed on the first surface by mask etching without using the jig of Example 1. The specific method is: the area of ​​the mask on the first surface from the edge of the groove to the center of the groove gradually decreases, the second surface is completely protected by the mask, and the ultra-thin glass is put into the etching tank for etching for 10 minutes, and then cleaned and stripped.

[0213] Comparative Example 4 (the area ratio of the arc groove is lower than the lower limit of this application)

[0214] This comparative example is basically the same as Example 1, except that:

[0215] In the non-light-shadow ultra-thin glass of this comparative example, the area of ​​the arc-shaped groove 2 accounts for 69% of the total area of ​​the first surface 101 .

[0216] Comparative Example 5

[0217] This comparative example is basically the same as Example 1, except that:

[0218] In the non-light-shadow ultra-thin glass of non-uniform thickness of this comparative example, the groove is not arc-shaped but has a trapezoidal cross-sectional structure, and there is a smooth transition between the parts of the trapezoidal cross-sectional structure and between the trapezoidal cross-sectional structure and the first surface.

[0219] Performance tests of non-uniform thickness ultra-thin glass and ultra-thin cover plates of the embodiments and comparative examples:

[0220] Performance testing method:

[0221] (1) Light and shadow distortion test: Place the product under a white light with a brightness of 2000-4000 lux and observe the product from different angles to see if there are any light and shadow patterns.

[0222] (2) 2PB (2-point bending) test: Place ultra-thin glass of unequal thickness in a bending machine, press the molding area down until the glass breaks, and record the bending radius data at the time of breakage.

[0223] (3) Bending radius: The radius value of the bending test of ultra-thin glass with non-uniform thickness (200,000 times);

[0224] (4) Bending times: The curved area of ​​the non-uniform thickness ultra-thin glass is defined as the bending area, and a bending test is performed. If the non-uniform thickness ultra-thin glass is not damaged after being bent 200,000 times, the test is stopped.

[0225] (5) Plane extrusion pressure: Use a universal testing machine to clamp a pen with a refill of 0.5 mm and squeeze the flat area of ​​the product at a certain speed. The pressure when the glass breaks is the plane extrusion pressure.

[0226] (6) Arc zone compression pressure: Use a universal testing machine to clamp a pen with a refill of 0.5 mm and squeeze the arc zone of the product at a certain speed. The pressure when the glass breaks is the arc zone compression pressure.

[0227] The performance test results of the embodiments and comparative examples are shown in Table 1.

[0228] Table 1 Performance test results of embodiments and comparative examples

[0229]

[0230] It can be seen from Table 1 that the non-uniform thickness ultra-thin glass without light and shadow in each embodiment of the present application has no light and shadow distortion phenomenon compared with other situations such as the trapezoidal cross-section structure in the comparative example, because the arc-shaped grooves are set and prepared by a specific preparation method, and other performances are basically the same.

[0231] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0232] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0233] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0234] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0235] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0236] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An ultra-thin glass with non-uniform thickness and without light and shadow, characterized in that: The invention comprises an ultra-thin glass body, wherein the ultra-thin glass body comprises a first surface and a second surface which are arranged opposite to each other and parallel to each other, wherein at least one arc-shaped groove is arranged on the first surface; and the edge parts of all the arc-shaped grooves which are adjacent to the first surface have a smooth transition with the first surface.

2. The non-uniform thickness ultra-thin glass without light and shadow according to claim 1, characterized in that: The area of ​​all the arc-shaped grooves accounts for 70-100% of the total area of ​​the first surface.

3. The non-uniform thickness ultra-thin glass without light and shadow according to claim 1, characterized in that: The arc-shaped groove is a circular arc-shaped groove, and the curvature radius of the arc-shaped groove, the minimum distance between the arc-shaped groove and the second surface, the chord length of the arc-shaped groove, and the distance between the second surface and the first surface meet the following relationship: T=R+J-SQR(R 2 -x 2 ), Wherein, T is the distance between the second surface and the first surface, in μm; J is the minimum distance between the arc-shaped groove and the second surface, in μm; R is the radius of curvature of the arc-shaped groove, in μm; x is the chord length of the arc-shaped groove, in μm.

4. The non-uniform thickness ultra-thin glass without light and shadow according to claim 1, characterized in that: The distance between the first surface and the second surface is 70-200 μm; And / or, the distances between all the arc-shaped grooves and the second surface gradually decrease from the edge of the arc-shaped groove to the center; And / or, the minimum distance between all the arc-shaped grooves and the second surface is 30-40 μm.

5. The non-uniform thickness ultra-thin glass without light and shadow according to any one of claims 1 to 4, characterized in that: The number of the arc-shaped groove is one, and the arc-shaped groove is located in the middle of the first surface.

6. A jig for preparing the non-uniform thickness ultra-thin glass without light and shadow as claimed in any one of claims 1 to 4, characterized in that: The invention comprises a fixture body, wherein the fixture body has a third surface, and a plurality of protrusions and grooves are arranged on the third surface in an interval and continuously manner.

7. A method for preparing the non-uniform thickness ultra-thin glass without light and shadow as claimed in any one of claims 1 to 5, characterized in that: include: Attaching and fixing a large piece of ultra-thin glass body to the third surface of the fixture as claimed in claim 6 to obtain a large piece of ultra-thin glass body; The attached large piece of ultra-thin glass body is subjected to non-uniform etching in the etching solution to obtain a non-uniformly etched large piece of ultra-thin glass; The non-uniformly etched large piece of ultra-thin glass is separated from the jig, and then laminate cutting, edge etching, laminate separation, and strengthening treatment are performed in sequence to obtain the non-uniform thickness ultra-thin glass without light and shadow.

8. The method according to claim 7, characterized in that The large piece of ultra-thin glass body and the fixture are fixed together by acid-resistant glue; And / or, the method further comprises a step of first cleaning the surface of the attached large piece of ultra-thin glass before performing the non-uniform etching; And / or, a method for non-uniformly etching the attached large piece of ultra-thin glass body in the etching solution, comprising: intermittently immersing the parts of the attached large piece of ultra-thin glass corresponding to the plurality of protrusions into the etching solution, and tossing the jig up and down at a preset speed each time the jig is immersed in the etching solution; Preferably, the preset speed is 0.5-1.5 cm / min; And / or, the etching solution includes at least one of hydrofluoric acid, sodium hydroxide solution, and potassium hydroxide solution; And / or, the method further comprises a step of performing a second cleaning on the non-uniformly etched large piece of ultra-thin glass and the jig before separating the non-uniformly etched large piece of ultra-thin glass from the jig.

9. An ultra-thin glass cover plate of non-uniform thickness, characterized in that: The invention comprises the ultra-thin glass with no light and shadow and of non-uniform thickness as claimed in any one of claims 1 to 5 or the ultra-thin glass with no light and shadow and of non-uniform thickness prepared by the method of claim 7 or 8.

10. The ultra-thin glass cover plate of non-uniform thickness according to claim 9, characterized in that: Also includes: a first coating disposed on the first surface; A second coating layer is provided on the surface of all the arc-shaped grooves, and the second coating layer is integrally formed with the first coating layer.

11. The ultra-thin glass cover plate of non-uniform thickness according to claim 10, characterized in that: The material of the first coating layer and the second coating layer includes at least one of polyurethane and polyacrylate; And / or, the first coating and the first surface, the second coating and all the arc-shaped grooves are connected together via a coupling agent; And / or, a distance between a side of the first coating layer away from the second surface and the second surface is d1, a distance between a side of the second coating layer away from the second surface and the second surface is d2, and d1≧d2.

12. A method for preparing the ultra-thin glass cover plate of non-uniform thickness as claimed in any one of claims 9 to 11, characterized in that: include: Attaching and fixing the second surface of the non-uniform thickness ultra-thin glass on a rigid substrate; A first coating and a second coating are respectively formed on the first surface of the non-uniform thickness ultra-thin glass and the surfaces of the plurality of arc-shaped grooves.

13. An electronic device, characterized in that: The non-uniform thickness ultra-thin glass comprising any one of claims 1 to 5; or The non-uniform thickness ultra-thin glass without light and shadow prepared by the method of claim 7 or 8; or The non-uniform thickness ultra-thin glass cover plate according to any one of claims 9 to 11; or An ultra-thin glass cover plate of non-uniform thickness prepared by the method of claim 12.

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