CN215955323U

CN215955323U - Display panel and transparent cover plate

Info

Publication number: CN215955323U
Application number: CN202121771030.4U
Authority: CN
Inventors: 高涌效; 毕铁钧; 王世友; 朱曦; 李晨
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-03-04
Anticipated expiration: 2031-07-30

Abstract

The disclosure relates to a display panel and a transparent cover plate, and relates to the technical field of display. The transparent cover plate comprises a glass substrate and a flat layer, wherein the glass substrate is provided with a flat area and a bending area positioned outside the flat area; the glass substrate comprises a first surface and a second surface which are opposite to each other, and a groove which is sunken towards the second surface is formed in the region of the first surface in the bending area; the intensity of bending zone is less than the intensity of levelling zone, and the bending zone can be to one side bending of levelling zone. The flat layer covers the first surface and fills the groove. The transparent cover plate can reduce the risk of fragmentation while realizing the function of bending.

Description

Display panel and transparent cover plate

Technical Field

The disclosure relates to the technical field of display, in particular to a display panel and a transparent cover plate.

Background

At present, a flexible display panel is widely used in a terminal device such as a mobile phone to obtain various usage forms. However, in order to make the display panel bendable, the thickness of the display panel needs to be reduced, and if the thickness is too low, the display panel is easily broken when being impacted by an external force.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide a display panel and a transparent cover plate, which can reduce the risk of cracking while achieving the bending function.

According to an aspect of the present disclosure, there is provided a transparent cover plate including:

the glass substrate is provided with a flat area and a bending area positioned outside the flat area; the glass substrate comprises a first surface and a second surface which are opposite to each other, and a groove which is sunken towards the second surface is formed in the region of the first surface, which is located in the bending area; the strength of the bending area is less than that of the leveling area, and the bending area can be bent towards one side of the leveling area;

and the flat layer covers the first surface and fills the groove.

In an exemplary embodiment of the present disclosure, the transparent cover further includes:

the protective layer is arranged on the surface of the glass substrate, which is far away from the flat layer; or the protective layer is arranged on the surface of the flat layer, which is far away from the glass substrate.

In an exemplary embodiment of the present disclosure, the protective layer is adhered to a surface of the glass substrate facing away from the planarization layer by an adhesive layer; or the protective layer is adhered to the surface of the flat layer, which is far away from the glass substrate.

and the light shielding layer is arranged on the surface of the transparent cover plate, close to the protective layer, and is positioned outside the bonding layer.

the shading layer is arranged on the surface of the second surface, which is far away from the flat layer; or the shading layer is arranged on the surface of the flat layer departing from the transparent cover plate.

In an exemplary embodiment of the present disclosure, the material of the planarization layer includes at least one of an optical glue, polyurethane, polyimide, and acryl.

In an exemplary embodiment of the present disclosure, a point of the bottom of the groove closest to the second face is 10 μm to 100 μm distant from the second face;

the distance between the area of the first surface in the flat area and the second surface is 20-500 μm.

the first protective layer is arranged on one side, away from the flat layer, of the glass substrate;

and the second protective layer is arranged on one side of the flat layer, which deviates from the glass substrate.

In an exemplary embodiment of the present disclosure, the transparent cover plate may further include:

the glass substrate is arranged on one layer of the glass substrate, which is far away from the flat layer, or the glass substrate is arranged on one side of the flat layer, which is far away from the glass substrate;

the glass substrate can be bent synchronously with the glass substrate.

In an exemplary embodiment of the present disclosure, the glass substrate is plural in number, and is sequentially stacked and distributed in a direction away from the glass substrate.

In an exemplary embodiment of the present disclosure, the number of the flat areas is two, and the flat areas are distributed on two sides of the folded-out area.

In an exemplary embodiment of the present disclosure, the number of the flat areas and the bending areas is one.

According to an aspect of the present disclosure, there is provided a display panel including:

a display substrate;

the transparent cover plate covers one side of the display substrate.

According to the display panel, the transparent cover plate and the manufacturing method thereof, the bending area and the leveling area which are different in thickness and strength can be arranged in the transparent cover plate, wherein the bending area is provided with the groove, the strength is low, bending is facilitated, the leveling area outside the bending area is large in thickness and high in strength, and therefore cracking is not prone to occurring. After the transparent cover plate covers the display substrate, the display substrate can be protected, and the bending function of the display substrate is not affected.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a schematic view of a first embodiment of a foldable transparent cover of the present disclosure.

Fig. 2 is a schematic view of a second embodiment of a foldable transparent cover of the present disclosure.

Fig. 3 is a schematic view of a third embodiment of a foldable transparent cover of the present disclosure.

Fig. 4 is a schematic view of a fourth embodiment of a foldable transparent cover of the present disclosure.

Fig. 5 is a schematic view of a fifth embodiment of a foldable transparent cover of the present disclosure.

Fig. 6 is a schematic view of a sixth embodiment of a foldable transparent cover of the present disclosure.

Fig. 7 is a schematic view of a seventh embodiment of a foldable transparent cover of the present disclosure.

Fig. 8 is a schematic view of a first embodiment of a roll-able transparent cover of the present disclosure.

Fig. 9 is a schematic view of a second embodiment of a roll-able transparent cover of the present disclosure.

Fig. 10 is a schematic view of a third embodiment of a roll-able transparent cover sheet of the present disclosure.

Fig. 11 is a schematic view of a fourth embodiment of a roll-able transparent cover of the present disclosure.

Fig. 12 is a schematic diagram of a rollable transparent cover roll of the present disclosure.

Fig. 13 is a flow chart of an embodiment of a first method of manufacturing of the present disclosure.

FIG. 14 is a schematic diagram of an embodiment of a first method of manufacturing of the present disclosure.

Fig. 15 is a schematic view of another embodiment of a first method of manufacturing of the present disclosure.

FIG. 16 is a flow chart of an embodiment of a second method of manufacturing of the present disclosure.

FIG. 17 is a flow chart of an embodiment of a third method of manufacturing of the present disclosure.

Fig. 18 is a schematic view of a third method of manufacturing the foldable transparent cover of the present disclosure.

Fig. 19 is a schematic diagram of a third manufacturing method of the present disclosure to make a roll-able transparent cover sheet.

Fig. 20 is a schematic diagram of a display panel according to an embodiment of the disclosure.

Description of reference numerals:

1. a glass substrate; 11. a first side; 12. a second face; 13. a groove; 101. a leveling zone; 102. a bending zone;

2. a planarization layer;

3. a protective layer;

4. an adhesive layer;

5. a light-shielding layer;

31. a first protective layer; 32. a second protective layer;

a1, glass substrate;

100. a display substrate; 1001. a deformation section; 1002. a non-deformable portion; 111. a display area; 112. a peripheral region;

01. a first corrosion resistant layer; 02. a second anti-corrosion layer;

001. an electrolytic cell; 002. melting alkali salt; 003. an electrode; 0031. a first electrode; 0032. a second electrode; 004. a power source.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.

In the related art, the display panel includes a display substrate and a transparent cover plate covering the display substrate, the display substrate may be protected by the transparent cover plate, and the transparent cover plate may include a transparent glass substrate. In a bendable display panel, it is generally necessary to bend (fold, curl, etc.) at a specific bending region to form a specific shape. In order to facilitate the bending of the display panel, the glass substrate should not have too large a thickness to have flexibility to be bendable, but this may cause a decrease in strength and may be easily broken if impacted or scratched by a foreign object. Therefore, in order to increase the strength of the glass substrate, the glass substrate needs to be tempered so as to increase the strength when the thickness of the glass substrate is low. However, if the bending performance of the bending area is to be ensured, the tempering degree of the bending area is not too high, and the glass substrate is generally in a plate-shaped structure with uniform thickness, and after the tempering process is performed, the tempering degree of the bending area is consistent with that of other areas, so that the overall strength of the glass substrate is difficult to improve, and the risk of cracking is still difficult to reduce.

The disclosed embodiments provide a transparent cover plate for a bendable display panel, as shown in fig. 1-11, the transparent cover plate may include a glass substrate 1 and a flat layer 2, wherein:

the glass substrate 1 has a flat region 101 and a bending region 102 located outside the flat region 101; the glass substrate 1 comprises a first surface 11 and a second surface 12 which are opposite to each other, and a groove 13 which is recessed towards the second surface 12 is formed in the region, located in the bending area 102, of the first surface 11; the strength of the bending area 102 is less than that of the flat area 101, and the bending area 102 can bend towards one side of the flat area 101;

the planarization layer 2 covers the first face 11 and fills the recess 13.

The transparent cover plate disclosed by the disclosure is provided with the bending area 102 and the leveling area 101 which are different in thickness and strength, the bending area 102 is provided with the groove 13, the strength is lower, the bending is facilitated, and the leveling area 101 outside the bending area 102 is larger in thickness and higher in strength, so that the transparent cover plate is not easy to crack. After the display substrate 100 is covered by the transparent cover plate, the display substrate 100 can be protected without affecting the bending function of the display substrate 100.

The transparent cover plate is explained in detail below:

as shown in fig. 1 to 11 and fig. 20, the transparent cover plate can cover one side of the display substrate 100 and can be bent synchronously with the display substrate 100, the display substrate 100 can be used for displaying images, taking an OLED (Organic Light Emitting Diode) display substrate 100 as an example, the display substrate can include a driving backplane and a Light Emitting layer located at one side of the driving backplane, the driving backplane can drive the Light Emitting layer to emit Light to display images, the transparent cover plate can be located at a side of the Light Emitting layer away from the driving backplane, and Light emitted by the Light Emitting layer can pass through the transparent cover plate. The display substrate 100 may be divided into a display region 111 and a peripheral region 112 outside the display region 111, wherein the light emitting layer is located in the display region 111, and the peripheral region 112 does not emit light.

As shown in fig. 1-11, the transparent cover plate may comprise a glass substrate 1 and a planarization layer 2, wherein:

the glass substrate 1 is a transparent plate-shaped structure, and may have a first surface 11 and a second surface 12 opposite to each other, and the first surface 11 and the second surface 12 may be distributed in a thickness direction. Meanwhile, the glass substrate 1 may be divided into a plurality of regions along the extending direction of the first surface 11 and the second surface 12, wherein the plurality of regions includes a flat region 101 and a bending region 102 located outside the flat region 101, and the region of the first surface 11 located in the bending region 102 is provided with a groove 13 recessed toward the second surface 12, so that the thickness of the bending region 102 is smaller than that of the flat region 101. The flat region 101 and the bending region 102 may be distributed along a first direction, and the groove 13 may extend and penetrate along a second direction perpendicular to the first direction. The profile of the cross section of the groove 13 in the first direction may be arc-shaped, rectangular, etc., and is not particularly limited thereto.

The point of the bottom of the groove 13 closest to the second face 12 may be at a distance of 10 μm-100 μm, e.g. 10 μm, 20 μm, 50 μm, 80 μm, 100 μm, etc. from the second face 12, i.e. the thickness of the region of the bending zone 102 where the thickness is smallest. One or more points of the bottom of the groove 13 closest to the second surface 12 may be provided, depending on the shape of the groove 13.

The distance between the area of the first side 11 located in the flat area 101 and the second side 12 is the thickness of the flat area 101, which may be 20 μm-500 μm, such as 20 μm, 30 μm, 40 μm, 50 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, etc.

The strength of the bending region 102 is less than that of the flat region 101, so that the bending region 102 can bend toward a side of the flat region 101, for example, the bending region 102 can bend toward a side of the first surface 11 facing away from the second surface 12, or bend toward a side of the second surface 12 facing away from the first surface 11. From this, the accessible sets up the thickness difference on glass substrate 1, and buckle district 102 and the even district 101 of intensity difference compromise buckle function and protect function, particularly, the intensity of even district 101 is higher, can play a role, and not fragile and split, and buckle district 102's intensity is lower, is favorable to increasing the flexibility, is convenient for buckle.

It should be noted that the above description of the bending region 102 is only a description of the functions of the bending region 102, and the state of the bending region 102 is not limited, that is, the bending region 102 may be bent or unfolded to be flush with the flat region 101.

In order to facilitate the formation of the bending region 102 and the leveling region 101 having different strengths, the bending region 102 and the leveling region 101 may be tempered respectively, and the tempering degree may be different, and a specific method will be described in detail in an embodiment of the manufacturing method below.

As shown in fig. 1 to 11, the planarization layer 2 may cover the first surface 11 of the glass substrate 1 and fill the groove 13, and the surface of the planarization layer 2 facing away from the glass substrate 1 may be a flat surface, so as to achieve planarization, cover the display substrate 100 with a transparent cover plate, or laminate other film layers. The material of the planarization layer 2 may include at least one of optical clear resin (OCA), Optical Clear Resin (OCR), polyurethane resin (PU), Polyimide (PI), and acryl (PMMA), but of course, other transparent materials may be used.

As shown in fig. 1 to 7, in some embodiments of the present disclosure, a transparent cover may be applied to a foldable display panel, as shown in fig. 20, a display substrate 100 of the display panel may include a deformable portion 1001 that can be bent and non-deformable portions 1002 distributed on two sides of the deformable portion 1001, and the two non-deformable portions 1002 may be folded due to the bending of the deformable portion 1001, so as to implement a folding function. Correspondingly, the number of the leveling regions 101 of the glass substrate 1 may be two, and the leveling regions 101 are distributed on two sides of the bending region 102, the two leveling regions 101 may correspond to the two non-deformable portions 1002, and the bending region 102 may correspond to the deformable portion 1001, so that the transparent cover plate can be folded along with the display substrate 100, and the bending region 102 can be bent to one side of the leveling region 101.

As shown in fig. 8 to 11, in other embodiments of the present disclosure, the transparent cover may be applied to a rollable display panel, and referring to the foldable display panel, the rollable display panel may have a deformed portion 1001 and a non-deformed portion 1002, and the deformed portion 1001 may be bent toward the non-deformed portion 1002. Correspondingly, the number of the flat area 101 and the bending area 102 is one, the flat area 101 may correspond to the non-deformable portion 1002, and the bending area 102 may correspond to the deformable portion 1001, so that the transparent cover plate can be folded along with the display substrate 100, and the bending area 102 can be bent to one side of the flat area 101.

As shown in fig. 1 and 2, and fig. 8 and 9, in order to prevent the transparent cover plate from being broken, the transparent cover plate further includes a protective layer 3, the glass substrate 1 is protected by covering the protective layer 3, and the material of the protective layer 3 may include at least one of Colorless Polyimide (CPI), polyethylene terephthalate (PET), thermoplastic polyurethane elastomer (TPU), and acryl, but other transparent materials may be used.

In some embodiments of the present disclosure, as shown in fig. 2 and 9, the protective layer 3 may be disposed on a surface of the glass substrate 1 facing away from the planarization layer 2, for example, the protective layer 3 may be adhered to the surface of the glass substrate 1 facing away from the planarization layer 2 by an adhesive layer 4, and the adhesive layer 4 may be a material capable of performing an adhesion function, such as an optical adhesive.

In other embodiments of the present disclosure, as shown in fig. 1 and 8, the protective layer 3 may be disposed on a surface of the flat layer 2 facing away from the glass substrate 1, for example, the protective layer 3 may be adhered to a surface of the flat layer 2 facing away from the glass substrate 1 by an adhesive layer 4, and the adhesive layer 4 may be a material capable of performing an adhesion function, such as an optical adhesive.

In order to block the non-light-emitting peripheral region 112 at the edge of the display substrate 100, as shown in fig. 1, fig. 2, and fig. 8 and fig. 9, in some embodiments of the disclosure, the transparent cover further includes a light shielding layer 5, which can be disposed on the surface of the protective layer 3 close to the transparent cover and located outside the adhesive layer 4, that is, the light shielding layer 5 and the adhesive layer 4 can be disposed on the same surface of the protective layer 3, and the light shielding layer 5 is located at the periphery of the adhesive layer 4. As shown in fig. 20, after the display substrate 100 is covered with the transparent cover plate, the light shielding layer 5 shields the peripheral region 112 of the display substrate 100 in a direction perpendicular to the display substrate 100, for example, the light shielding layer 5 may be a ring-shaped continuous ring structure and surrounds the bonding layer 4.

In some embodiments of the present disclosure, the display panel shown in fig. 3 and 10 may not employ the protective layer 3 and the adhesive layer 4, and the light shielding layer 5 may be disposed on the surface of the second surface 12 of the glass substrate 1 facing away from the flat layer 2, and also serves to shield the peripheral region 112 of the display substrate 100. Of course, in other embodiments of the present disclosure, as shown in fig. 4 and fig. 11, the light shielding layer 5 may also be disposed on a surface of the planarization layer 2 facing away from the transparent cover plate, and may also be used to shield the peripheral region 112 of the display substrate 100.

The material of the light shielding layer 5 may be black ink, and may be other materials capable of shielding light, such as black resin, and is not particularly limited herein.

In other embodiments of the present disclosure, as shown in fig. 5, two protective layers may be provided to prevent the glass substrate 1 from being broken, and specifically, the transparent cover plate further includes a first protective layer 31 and a second protective layer 32, wherein:

the first protection layer 31 can be disposed on a side of the glass substrate 1 away from the planarization layer 2, for example, the first protection layer 31 can be adhered to a surface of the glass substrate 1 away from the planarization layer 2 by the first adhesive layer 41,

the second protection layer 32 is disposed on a side of the planarization layer 2 away from the glass substrate 1, for example, the second protection layer 32 can be adhered to a surface of the planarization layer 2 away from the glass substrate 1 through a second adhesive layer 42.

The materials of the first protective layer 31 and the second protective layer 32 can refer to the protective layer 3, and are not shown here, and the boundaries of the first protective layer 31 and the second protective layer 32 can be located outside the boundaries of the glass substrate 1, i.e. the areas of the first protective layer 31 and the second protective layer 32 are larger than the glass substrate 1. In addition, the light shielding layer 5 may be disposed on a surface of the first protective layer 31 facing away from the glass substrate 1, or on a surface of the second protective layer 32 facing away from the glass substrate 1.

By the first protective layer 31 and the second protective layer 32, the glass substrate 1 can be protected from both sides of the glass substrate 1, and the risk of the transparent cover plate being broken is further reduced.

In some embodiments of the present disclosure, as shown in fig. 6, the transparent cover plate may further include a glass substrate a1, which may be disposed on a side of the glass substrate 1 facing away from the planarization layer 2. The glass substrate a1 may be the same plate-like structure as the glass substrate 1, and the boundary of the glass substrate a1 may be aligned with the boundary of the glass substrate 1 and may be bent in synchronization with the glass substrate 1; that is, the glass substrate a1 has a bending region corresponding to the bending region 102 and a flat region corresponding to the flat region 101, but the glass substrate a1 may not have the groove 13 in its bending region, and the strength of the bending region of the glass substrate a1 may be less than or equal to that of its flat region. Of course, a groove may be provided in the glass substrate a1 at a position corresponding to the groove 13 to improve flexibility. For example, if the glass substrate a1 is provided with a groove, the groove may be provided on the surface of the glass substrate a1 facing the glass substrate 1, or may be provided on the surface of the glass substrate a1 facing away from the glass substrate 1, which is not limited herein.

In other embodiments of the present disclosure, as shown in fig. 7, the glass substrate a1 may be disposed on a side of the planarization layer 2 facing away from the glass substrate 1, and may be bent synchronously with the glass substrate 1.

Further, as shown in fig. 6 and 7, the number of the above-mentioned glass substrates a1 may be plural, for example, two, three, four, five, etc. A plurality of glass substrates a1 may be sequentially stacked and distributed along a direction away from the glass substrate 1, so that the transparent cover plate has multiple layers of glass (a glass substrate 1 or a glass substrate a1 may be regarded as a layer of glass). Two adjacent layers of glass can be bonded through a glue layer. A part or all of the glass substrates a1 in each of the glass substrates a1 may be provided with grooves corresponding to the grooves 13, and of course, each of the glass substrates a1 may not be provided with grooves.

Further, as for the structure of the foregoing multiple layer glass, it may be combined with the foregoing first protective layer 31 and second protective layer 32, that is, both the glass substrate 1 and the glass base a1 may be located between the first protective layer 31 and the second protective layer 32.

It should be noted that the above embodiments based on fig. 5 to 7 are described with respect to the foldable transparent cover, but the technical features of the first protective layer 31, the second protective layer 32 and the glass substrate a1 are not limited to be applicable only to the foldable transparent cover, and those skilled in the art can understand that the above embodiments can also be applied to a roll-able transparent cover, which is not described in detail herein.

As shown in fig. 12, fig. 12 illustrates the principle of the sliding rolling of the transparent cover plate capable of sliding rolling, and it can be seen that the bending region 102 is bent toward one side of the transparent substrate, and the bending region 102 can be translated along the direction parallel to the flat region 101, so as to implement the sliding rolling function, and make the bending region 102 form a U-shaped structure.

In order to manufacture the transparent cover plate of any of the above embodiments, the present disclosure provides various manufacturing methods, which are explained below:

first manufacturing method

As shown in fig. 13 to 15, the first manufacturing method may include steps S110 to S180, in which:

step S110, forming a glass substrate, wherein the glass substrate is provided with a flat area and a bending area positioned outside the flat area; the glass substrate comprises a first surface and a second surface which are opposite to each other, and a groove which is sunken towards the second surface is formed in the region of the first surface, which is located in the bending area;

step S120, forming a first anti-corrosion layer on the first surface and the second surface in the area of the leveling area, wherein the first anti-corrosion layer exposes the first surface and the second surface in the area of the bending area;

s130, tempering the bending area through an ion exchange process;

step S140, removing the first anti-corrosion layer;

step S150, forming a second anti-corrosion layer on the first surface and the second surface in the region of the bending region, where the second anti-corrosion layer exposes the first surface and the second surface in the region of the leveling region;

s160, tempering the leveling area through an ion exchange process; the strength of the bending area is less than that of the leveling area, and the bending area can be bent towards one side of the leveling area;

step S170, removing the second anti-corrosion layer;

and step S180, forming a flat layer which covers the first surface and fills the groove.

The following explains the steps of the above-described manufacturing method:

as shown in fig. 14 and 15, in step S110, the structure of the glass substrate 1 has been described in detail in the above embodiment of the transparent cover plate, and is not repeated here.

As shown in fig. 14 and 15, in step S120, the first anti-corrosion layer 01 is used to protect the flat region 101 in the tempering process of step S130, and ensure that only the bending region 102 is tempered.

As shown in fig. 14 and 15, in some embodiments of the present disclosure, if the tempering is performed using the molten alkali salt in step S130, the first anti-corrosion layer 01 is a material resistant to corrosion of the molten salt, so that it is not dissolved in the alkali salt. The specific material of the first anti-corrosion layer 01 may depend on the composition of the alkali melt salt, for example, if the alkali melt salt includes at least one of potassium nitrate and sodium nitrate, it is desirable to use the first anti-corrosion layer 01 that is free from dissolution in potassium nitrate, sodium nitrate or a mixture thereof in a molten state (at 350 ℃ to 400 ℃), and to block potassium ions and sodium ions from ion-exchanging with the glass substrate 1 of the planarized region 101.

The first anti-corrosion layer 01 may be a salt-resistant film, and the salt-resistant film may be bonded to the first surface 11 and the second surface 12 by using a rolling process or a vacuum bonding process. Alternatively, the first anti-corrosion layer 01 may also be made of salt-resistant ink, and the first anti-corrosion layer 01 may be directly formed on the first surface 11 and the second surface 12 by silk-screening, pad printing, photolithography, and the like. The process is not particularly limited.

Before the first corrosion-resistant layer 01 is formed, the glass substrate 1 may be cleaned to remove the adhering impurities.

As shown in fig. 14 and 15, in step S130, the bending region 102 of the transparent substrate is chemically ion-exchanged with a molten alkali salt, so that compressive stress is formed on the first surface 11 and the second surface 12 of the bending region 102, and tensile stress is formed inside the bending region 102, thereby improving the strength of the bending region 102. In some embodiments of the present disclosure, step S130 may include:

the glass substrate 1 covered with the first corrosion resistant layer 01 is placed in a molten alkali salt for a first length of time. The molten base salt may include at least one of potassium nitrate and sodium nitrate such that sodium or potassium ions are ion exchanged with the inflection region 102 to increase the strength of the inflection region 102. The first time period is not particularly limited, and depends on the concentration of the alkali melt salt, the thickness of the glass substrate 1, and the like.

The glass substrate 1 was taken out from the molten alkali salt.

As shown in fig. 14 and 15, in step S140, the process of removing the first anti-corrosion layer 01 may depend on the specific material, for example, the first anti-corrosion layer 01 is a salt-resistant film adhered to the glass substrate 1, and the adhesion of the salt-resistant film can be removed by means of ultraviolet irradiation, so that the first anti-corrosion layer 01 can be peeled.

As shown in fig. 14 and 15, in step S150, the second anti-corrosion material may be processed as described above with reference to the first anti-corrosion layer 01, which is not described herein again. The tempered bent region 102 can be protected by the second anti-corrosion layer 02 to expose the flat region 101, so that only the flat region 101 is tempered in step S160.

As shown in fig. 14 and 15, in step S160, the bending region 102 of the transparent substrate is chemically ion-exchanged with the alkali melt salt, so that compressive stress is formed on the first surface 11 and the second surface 12 of the bending region 102, and tensile stress is formed inside the bending region 102, thereby improving the strength of the flat region 101. In some embodiments of the present disclosure, step S160 may include:

placing the glass substrate 1 covered with the second anti-corrosion layer 02 in a molten alkali salt for a second length of time; the second time length is longer than the first time length, so that the strength of the bending area 102 is smaller than that of the flat area 101, and the bending area 102 can bend towards one side of the flat area 101;

the glass substrate 1 was taken out from the molten alkali salt.

As shown in fig. 14 and 15, the process of tempering the flat region 101 may refer to the process of tempering the bending region 102, and will not be described in detail. The difference is that in order to make the strength of the bending region 102 less than that of the leveling region 101, the tempering degree of the leveling region 101 can be made higher than that of the bending region 102 by making the second time period less than the first time period.

As shown in fig. 14 and 15, in step S170, the process of removing the second anti-corrosion layer 02 may depend on a specific material thereof, for example, the second anti-corrosion layer 02 is a salt-resistant film adhered to the glass substrate 1, and the adhesion may be removed by means of ultraviolet irradiation, so that the second anti-corrosion layer 02 may be peeled.

As shown in fig. 1 to 11, in step S180, the structure and material of the planarization layer 2 can refer to the above embodiments of the transparent cover plate, and will not be described in detail here.

Of course, in some embodiments of the present disclosure, the steps of forming the protective layer 3 and the light shielding layer 5 may be further included, and the specific structure and material and the lamination relationship may refer to the above embodiments of the transparent cover plate, and are not described in detail here.

Second manufacturing method

As shown in fig. 16, the second manufacturing method may include steps S210 to S280, in which:

step S210, forming a glass substrate, wherein the glass substrate is provided with a flat area and a bending area positioned outside the flat area; the glass substrate comprises a first surface and a second surface which are opposite to each other, and a groove which is sunken towards the second surface is formed in the region of the first surface, which is located in the bending area;

step S220, forming a first anti-corrosion layer in the areas of the first surface and the second surface in the bending area, and exposing the areas of the first surface and the second surface in the leveling area from the first anti-corrosion layer;

step S230, tempering the leveling area through an ion exchange process;

step S240, removing the first anti-corrosion layer;

step S250, forming a first anti-corrosion layer on the first surface and the second surface in the region of the leveling area, wherein the second anti-corrosion layer exposes the first surface and the second surface in the region of the bending area;

step S260, tempering the bending area through an ion exchange process; the strength of the bending area is less than that of the leveling area, and the bending area can be bent towards one side of the leveling area;

step S270, removing the second anti-corrosion layer;

step S280, forming a flat layer covering the first surface and filling the groove.

In some embodiments of the present disclosure, step S230 may include:

placing the glass substrate covered with the first corrosion resistant layer in a molten alkali salt for a first period of time;

in some embodiments of the present disclosure, the glass substrate is removed from the molten alkali salt;

in some embodiments of the present disclosure, step S260 may include:

placing the glass substrate covered with the second anti-corrosion layer in the molten base salt for a second length of time; the second time length is less than the first time length, so that the strength of the bending area is less than that of the leveling area, and the bending area can bend towards one side of the leveling area;

removing the glass substrate from the molten alkali salt.

The second manufacturing method adopts a process similar to that of the first manufacturing method, and is different in the sequence of the tempering process, namely, the second manufacturing method firstly protects the bending region 102 through the first anti-corrosion layer 01 and tempers the flat region 101; and then, the second anti-corrosion layer 02 protects the flat region 101 and tempers the bending region 102, and the specific ion exchange process and the material of the film layer refer to the embodiment of the first manufacturing method, which is not described herein again.

Third manufacturing method

As shown in fig. 17 to 19, the transparent cover plate may be manufactured by the electrolytic cell principle, and the third manufacturing method may include steps S310 to S360, in which:

step S310, forming a glass substrate, wherein the glass substrate is provided with a flat area and a bending area positioned outside the flat area; the glass substrate comprises a first surface and a second surface which are opposite to each other, and a groove which is sunken towards the second surface is formed in the region of the first surface, which is located in the bending area;

step S320, placing the glass substrate in a molten alkali salt;

step S330, extending a plurality of electrodes into the molten alkali salt, wherein the electrodes are positioned on the side, away from the second side, of the first side; the electrodes comprise a first electrode and a second electrode, the orthographic projection of the first electrode on the glass substrate is positioned in the leveling area, and the orthographic projection of the second electrode on the glass substrate is positioned in the bending area;

step S340, conducting the first electrode with the negative electrode of a power supply, conducting the second electrode with the positive electrode of the power supply, and lasting for a specified time;

step S350, taking out the glass substrate and cleaning;

and step S360, forming a flat layer which covers the first surface and fills the groove.

The third manufacturing method is explained in detail below:

as shown in fig. 18 and 19, in step S310, the structure of the glass substrate 1 has been described in detail in the above embodiment of the transparent cover plate, and is not repeated here.

As shown in fig. 18 and 19, in step S320, an electrolytic cell 001 containing a molten alkali salt 002 may be provided, and the glass substrate 1 may be placed in the electrolytic cell 001 so as to be immersed in the molten alkali salt 002. The molten alkali salt 002 may be an alkali salt that is ion-exchanged with the glass substrate 1, and for example, the molten alkali salt 002 may include at least one of potassium nitrate and sodium nitrate. In order to ensure that both the first side 11 and the second side 12 of the glass substrate 1 can be ion exchanged, the glass substrate 1 can be spaced from the bottom or the side walls of the electrolytic cell 001.

As shown in fig. 18 and 19, in step S330, the electrode 003 may be an electrode rod, which may be a column, and the material of the electrode 003 may be graphite or other conductive material. The number of the electrodes 003 may be plural, and at least includes a first electrode 0031 and a second electrode 0032, each of the electrodes may not completely extend below the liquid level of the molten alkali salt 002 in a direction perpendicular to the glass substrate 1, the first electrode 0031 may correspond to the flattening region 101, and the second electrode 0032 may correspond to the bending region 102, but each of the electrodes 003 is not in contact with the glass substrate 1, so that an orthographic projection of the first electrode 0031 on the glass substrate 1 is located in the flattening region 101, and an orthographic projection of the second electrode 0032 on the glass substrate 1 is located in the bending region 102.

In some embodiments of the present disclosure, as shown in fig. 18, the glass substrate 1 has two flat regions 101 and one bending region 102, and the number of the first electrodes 0031 is two and corresponds to the two flat regions 101, respectively; the number of the first electrodes 0031 is one, and corresponds to the inflection region 102.

In other embodiments of the present disclosure, as shown in fig. 19, the glass substrate 1 has one flat region 101 and one bending region 102, the number of the first electrode 0031 and the second electrode 0032 is one, and the flat region 101 corresponds to the second electrode 0032 corresponds to the bending region 102.

As shown in fig. 18 and 19, in step S340, each electrode 003 can be connected to a power source 004, the power source 004 can be a dc power source 004, which can include one battery or a plurality of batteries, or other devices capable of supplying dc power can be used, as long as the negative electrode of the power source 004 can be connected to the first electrode 0031 and the positive electrode can be connected to the second electrode 0032. The first electrode 0031 can be conducted with the negative electrode of the power source 004, and the second electrode 0032 can be conducted with the positive electrode of the power source 004. Meanwhile, the time period of turning on the power supply 004 may be a designated time period, and the specific time is not particularly limited herein. In addition, the above electrolytic process may be performed at a temperature of 350 ℃ to 400 ℃.

As shown in fig. 18 and 19, taking the alkali molten salt 002 as potassium nitrate as an example, the potassium ion concentration near the first electrode 0031 is high, the gradient of the potassium ion concentration between the alkali molten salt 002 and the glass substrate 1 is large, the ion exchange rate is high, and the flattening region 101 corresponding to the first electrode 0031 can obtain a larger surface compressive stress and stress layer depth within a given period of time. Meanwhile, the concentration of potassium ions near the second electrode 0032 is relatively low, the gradient of the concentration of potassium ions in the molten alkali salt 002 and the glass substrate 1 is relatively small, and the ion exchange rate is relatively slow, so that the bending region 102 corresponding to the second electrode 0032 can obtain a surface compressive stress and a stress layer depth smaller than that of the flattening region 101 within a specified time period, and therefore, the glass substrate 1 can be tempered through the electrolytic cell principle, but the strength of the bending region 102 is lower than that of the flattening region 101.

As shown in fig. 18 and 19, in step S350, the glass substrate 1 is taken out and cleaned.

After the tempering is completed, the glass substrate 1 may be taken out from the molten alkali salt 002, and the first surface 11 and the second surface 12 may be cleaned.

As shown in fig. 1 to 11, in step S360, the structure and material of the planarization layer 2 can refer to the above embodiments of the transparent cover plate, and will not be described in detail here.

In addition, of course, in some embodiments of the present disclosure, a step of forming the protective layer 3 and the light shielding layer 5 may be further included, and the specific structure and material and the lamination relationship may refer to the above embodiments of the transparent cover plate, and are not described in detail here.

It should be noted that although the various steps of the various manufacturing methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.

The disclosed embodiments also provide a display panel, which may include a display substrate 100 and a transparent cover plate, wherein:

the display substrate 100 is used for displaying an image, and for example, the OLED display substrate may include a driving backplane and a light emitting layer located at one side of the driving backplane, the driving backplane has a driving circuit, and the light emitting layer includes a plurality of light emitting devices, and the light emitting devices may be driven by the driving circuit to emit light to display an image. The display substrate 100 may further include an encapsulation layer covering the light emitting layer, and a polarizing layer disposed on a side of the encapsulation layer away from the driving backplane.

The display substrate 100 is a flexible display substrate, and can be bent at a specific position to realize folding or rolling of the display panel. For example, the display substrate 100 has a deformable portion 1001 that can be bent and a non-deformable portion 1002 located outside the deformable portion 1001, and the deformable portion 1001 can be bent while the non-deformable portion 1002 is kept flat. For a foldable display panel, the display substrate 100 may have one deformation portion 1001 and two non-deformation portions 1002 located at both sides of the deformation portion 1001, and the two non-deformation portions 1002 may be unfolded or opposite. For a rollable display panel, there may be one deformed portion 1001 and one non-deformed portion 1002.

The transparent cover plate is a transparent cover plate according to any of the above embodiments, and the specific structure thereof is not described herein again, and the transparent cover plate may cover a side of the display substrate 100, for example, the transparent cover plate may cover a side of the polarizing layer away from the driving backplane.

As shown in fig. 20, in some embodiments of the present disclosure, the transparent cover plate has a protective layer 3 and an adhesive layer 4, and the protective layer 3 may be located on a side of the glass substrate 1 facing away from the display substrate 100.

In other embodiments of the present disclosure, the transparent cover plate is free of the protective layer 3 and the adhesive layer 4, and the glass substrate 1 may be located on a side of the planarization layer 2 close to or away from the display substrate 100.

The display substrate 100 has a display region 111 and a peripheral region 112 located outside the display region 111, and the deformed portion 1001 and the non-deformed portion 1002 are both located at least partially in the display region 111. The light-shielding layer 5 may correspond to the peripheral region 112 to shield the peripheral region 112.

The bending region 102 of the transparent cover plate corresponds to the deformation portion 1001 of the display substrate 100, so that the bending region 102 and the deformation portion 1001 can be bent toward one side of the flat region 101 to realize the deformation of the display panel.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A transparent cover, comprising:

and the flat layer covers the first surface and fills the groove.

2. The transparent cover sheet according to claim 1, further comprising:

3. The transparent cover sheet according to claim 2, wherein the protective layer is bonded to the surface of the glass substrate facing away from the flat layer by an adhesive layer; or the protective layer is adhered to the surface of the flat layer, which is far away from the glass substrate.

4. The transparent cover sheet according to claim 3, further comprising:

5. The transparent cover sheet according to claim 1, further comprising:

6. The transparent cover sheet according to claim 1, wherein the material of the planarization layer comprises at least one of optical glue, polyurethane, polyimide, and acrylic.

7. The transparent cover sheet according to claim 1, wherein the bottom of the groove is located closest to the second face at a distance of 10-100 μm from the second face;

8. The transparent cover sheet according to claim 1, further comprising:

9. The transparent cover sheet according to claim 1, further comprising:

the glass substrate can be bent synchronously with the glass substrate.

10. The transparent cover sheet according to claim 9, wherein the glass substrate is in a plurality and is stacked in sequence in a direction away from the glass substrate.

11. The transparent cover plate according to any one of claims 1 to 10, wherein the number of the flat areas is two, and the flat areas are distributed on both sides of the bending area.

12. The transparent cover sheet according to any one of claims 1 to 10, wherein the number of the flat areas and the bending areas is one.

13. A display panel, comprising:

a display substrate;

the transparent cover sheet of any one of claims 1-12, overlaid on one side of the display substrate.