CN114005356A - Flexible display cover plate and flexible display device - Google Patents
Flexible display cover plate and flexible display device Download PDFInfo
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- CN114005356A CN114005356A CN202010732710.9A CN202010732710A CN114005356A CN 114005356 A CN114005356 A CN 114005356A CN 202010732710 A CN202010732710 A CN 202010732710A CN 114005356 A CN114005356 A CN 114005356A
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Images
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
Abstract
The application provides a flexible display apron and flexible display device, above-mentioned flexible display apron covers on flexible display module assembly. This flexible display device includes flexible display module assembly, and flexible display apron is applied to flexible display device, and flexible display apron has the bendability. The flexible display cover plate comprises a glass layer covering the display module and a hardening layer covering the glass layer; be equipped with the zone of attenuate on the glass layer and enclose and locate the peripheral support region in zone of attenuate, wherein, the thickness in zone of attenuate is less than the thickness in support region. The flexible display cover plate in the application can ensure the flatness of the surface of the flexible display cover plate in the bending or curling process, and is not easy to crack.
Description
Technical Field
The application relates to the technical field of terminals, in particular to a flexible display cover plate and a flexible display device.
Background
At present, in the scheme of flexible display apron, generally adopt one deck or several layers of polymer film that can buckle to pass through the flexible glue laminating to the display module assembly on to the protection display module assembly, because polymer film possesses good bendable performance, transparent polyimide (CPI) and polyethylene terephthalate (PET) below for example 0.1mm can generally buckle to curvature radius below 1 mm. However, in contrast to hard glass, the polymer film covering the display module has the following problems: 1) the modulus of the polymer is usually less than 8GPa, the thickness is less than 100 μm, the protective effect on a screen in a display module is poor, and when the polymer film is attached to the display module, an ultra-soft Optical Clear Adhesive (OCA) is generally adopted, and the ultra-soft optical clear adhesive is easily extruded and deformed during impact, so that the impact resistance is poor; 2) the high polymer film has poor rigidity, the surface of the display module is fluctuated after the display module is attached by the ultra-soft optical transparent adhesive, and the surface precision is poor; 3) the polymer film has poor fatigue resistance, and the cover plate is easy to arch or crease due to repeated bending and creep deformation, so that the surface texture is influenced.
Although a thick glass cover plate (thickness > 0.4mm) exhibiting rigidity cannot be bent, repeated bending with a bending radius of 5mm or less can be realized by reducing the glass thickness to 0.1mm or less by ultra-thin glass processing techniques. As bendable glass, the flexible ultrathin glass is expected to solve the problems of insufficient surface flatness, poor surface texture, insufficient screen protection and the like when a flexible polymer film is used as a cover plate. The above-described flexible ultra-thin glass is easily broken.
Disclosure of Invention
The application provides a flexible display apron and flexible display device reduces the cracked risk of glass layer when curling, bending.
In a first aspect, the present application provides a flexible display cover plate that covers a flexible display module. The flexible display cover plate is of a laminated structure and comprises a glass layer covering the flexible display module and a hardening layer covering the glass layer, wherein the hardening layer is located on the outermost side. The glass layer has better rigidity, so that the surface of the glass layer is not easy to crease or arch after being bent or curled; the hardening layer has better hardness and intensity, and the top that the hardening layer covered on the glass layer can protect the glass layer to avoid the surface on glass layer to be pierced through by sharp object, fish tail or receive pressure cracked. Because the thickness of the thinning area on the glass layer is smaller than the thickness of the supporting area surrounding the thinning area, under the condition that the overall thickness of the glass layer is reduced, the supporting area supports the edge part of the glass layer, so that the strength of the edge of the glass layer is increased, and thus, when the flexible display cover plate is bent or curled, the condition that the edge of the glass layer is cracked is reduced, therefore, the flatness of the surface of the glass layer can be guaranteed by the glass layer arranged in the flexible display cover plate, and the glass layer is not easy to crack.
When the thinning area of the glass layer is arranged, the thickness of the thinning area can be within the range of 20-100 mu m; the width of the support zone may be in the range 0.2-5 mm; the thickness of the support region may be in the range 70 μm-700 μm; wherein the thickness of the support region is always kept larger than that of the thinning region. So that when the glass layer has flexibility, the risk of breakage of the glass layer is reduced, and the glass layer has enough strength.
When the hardening layer is specifically arranged, the hardening layer can be made of different materials, and the material of the hardening layer specifically comprises at least one of polyurethane resin, acrylic resin, epoxy resin, amino resin, alkyd resin and organic silicon resin. The hardened layer has good adhesion (the Baige test is more than 4B) so that the hardened layer is better adhered to the glass layer; the hardened layer also has good optical performance (light transmittance is more than 85 percent, haze is less than 5 percent) so that the light emitted by the display module passes through the hardened layer with less loss.
The material of the hardened layer may further be doped with at least one of siloxane, silica, alumina, zirconia, graphene or diamond to improve the strength of the hardened layer.
When the glass layer is arranged, a groove is arranged on one side of the glass layer, which is far away from the display module, and the area where the groove is located is the thinning area; or a groove is arranged on one side of the glass layer close to the display module, and the area where the groove is located is a thinning area; or the glass layer is close to the display module assembly and all is equipped with a recess with the one side that deviates from the display module assembly again, and the degree of depth and the area of two recesses can be the same this moment, and the region at two recess places is the region of reducing the thickness. The grooves may be formed by etching a glass layer having a uniform thickness with hydrofluoric acid or sodium hydroxide of a certain concentration.
When the thinning area on the glass layer is arranged, the thinning area can be in a rounded rectangle structure; at this time, the structure of the support area may include two first support sections and two second support sections, the two second support sections are disposed between the two first support sections, the two first support sections and the two second support sections form a rounded rectangular structure, wherein the thickness of the first support section is less than or equal to that of the second support section, the extending direction of the first support section is the same as the curling direction of the glass layer, and the extending direction of the first support section is also perpendicular to the curling axis direction of the glass layer. When the thickness of the first supporting section is smaller than that of the second supporting section or the thickness of the first supporting section is equal to that of the second supporting section, the side, facing the hardening layer, of the first supporting section can be provided with a hole structure by etching bamboo book patterns or other patterns, so that the flexibility of the first supporting section is improved. When the glass layer curls, the elastic acting force of the glass layer during curling can be reduced by the arrangement of the first support section, and when the curling radius is smaller, the risk that the first support section starts to crack is also reduced.
When the supporting area on the glass layer is arranged, the supporting area comprises a plurality of bending sections, the bending sections are positioned on the folds of the glass layer, and the thickness of the bending sections is smaller than that of the supporting area except the bending sections; when the glass layer is bent, the change of the elastic acting force of the bent part is small, and the risk that the support area is cracked when the bending radius is small is reduced.
It should be noted that, a plurality of bending sections may be provided, and the plurality of bending sections are distributed at intervals.
In addition, still be equipped with first adhesive linkage between glass layer and display module assembly, first adhesive linkage is used for bonding glass layer and display module assembly.
When the first adhesive layer is specifically arranged, the first adhesive layer can be optical adhesive, specifically pressure-sensitive, thermosetting or ultraviolet-cured acrylic adhesive, epoxy adhesive, silica gel and the like, has the thickness of 1-200 μm and the elastic modulus of 1-1 GPa, and has good adhesive performance and bending performance, so that the glass layer and the display module can be adhered together, and the bending or curling operation can be adapted.
In addition, when the both sides on glass layer all were equipped with the recess, still can be equipped with the buffer layer between first adhesive linkage and the glass layer, the elastic modulus of buffer layer is less than the elastic modulus on sclerosis layer. Specifically, the elastic modulus of the hardened layer can be between 10MPa and 10GPa, and the elastic modulus of the buffer layer is between 10kPa and 100MPa, so that the buffer layer can be effectively deformed when the flexible display cover plate is impacted, and sufficient buffer is provided.
One side that deviates from the glass layer at the sclerosis layer still can be equipped with first strengthening layer, and the surface on sclerosis layer is laminated to first strengthening layer, can improve the surperficial modulus of sclerosis layer. Wherein the modulus of the first strengthening layer is between 1GPa and 15 GPa.
When the first strengthening layer is specifically arranged, the first strengthening layer can be a polymer film, the thickness of the polymer film is 0.01-0.2mm, and the light transmittance is greater than or equal to 85%. The polymer film may be at least one of polyimide, polyethylene terephthalate, aramid, polyethylene naphthalate, polycarbonate, polymethyl methacrylate, and thermoplastic polyurethane elastomer rubber.
When the hardening layer is specifically arranged, the hardening layer can comprise a filling coating layer arranged in a thinning area on one side of the glass layer, which is far away from the display module, and a hardening hydrophobic coating layer positioned on one side of the filling coating layer, which is far away from the thinning area; the thickness of the filling coating can be the same as the depth of the thinning area or higher than the depth of the thinning area; the thickness of the filling coating can be 0.001mm-0.05mm, the thickness of the hardened hydrophobic coating can be 1 μm-20 μm, the hardness of the hardened hydrophobic coating which needs to meet is greater than or equal to pencil hardness, the water drop angle is greater than or equal to 100 degrees, and the friction coefficient is less than 0.1.
Illustratively, the flexible display apron of this application still can include the protective layer with the high parcel of glass layer, and the protective layer can reduce the glass layer and receive the cracked condition emergence of stress because of the side leads to whole glass layer after being formed with the attenuate district, improves the life of flexible display apron. The protective layer is arranged on the first reinforcing layer, and the second reinforcing layer is arranged between the hardened layer and the protective layer. The second bonding layer is used for connecting the second strengthening layer with the protective layer, the structure and the components of the second bonding layer and the first bonding layer are the same, and the second strengthening layer and the first strengthening layer are the same.
In a second aspect, the present application further provides a flexible display device, where the flexible display device at least includes a flexible display cover plate in any one of the above technical solutions, and the flexible display cover plate and the display module are stacked. This flexible display device's apron including cover in glass layer on the display module assembly, and cover in harden layer on the glass layer, the harden layer has better hardness and intensity, can protect the glass layer to the surface of avoiding the glass layer is impaled by sharp object, the fish tail or receives pressure fragmentation. The flexible display cover plate is characterized in that the glass layer is provided with a thinning area and a supporting area which is arranged around the thinning area, wherein the thickness of the thinning area is smaller than that of the supporting area, and the thickness of the supporting area which is arranged around the thinning area on the glass layer is larger than that of the thinning area, so that the strength of the edge of the glass layer can be ensured when the flexible display cover plate is bent or curled, and the glass layer is not easy to crack when the flexible display cover plate is curled or bent.
Drawings
FIG. 1 is a top view of a glass layer in a flexible display cover provided in an embodiment of the present application;
FIG. 2 is a cross-sectional view of FIG. 1A-A;
FIG. 3 is a cross-sectional view of FIG. 1A-A;
FIG. 4 is yet another top view of a glass layer in a flexible display cover provided in accordance with embodiments of the present application;
FIG. 5 is yet another top view of a glass layer in a flexible display cover provided in accordance with an embodiment of the present application;
FIG. 6 is yet another top view of a glass layer in a flexible display cover provided in accordance with embodiments of the present application;
fig. 7 is a schematic structural diagram of a flexible display cover according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of another flexible display cover according to an embodiment of the present disclosure;
FIG. 9 is a schematic view of another structure of a flexible display cover according to an embodiment of the present application;
FIG. 10 is a schematic view of another structure of a flexible display cover according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of a flexible display cover according to an embodiment of the present application;
FIG. 12 is a schematic view of another structure of a flexible display cover according to an embodiment of the present application;
fig. 13 is a schematic structural diagram of another flexible display cover according to an embodiment of the present application.
Reference numerals:
10-a glass layer; 11-a support zone; 110-a first support section; 111-a second support section; 113-bending sections; 12-a thinning zone; 13-a groove; 20-a hardened layer; 21-a filler coating; 22-hardening the hydrophobic coating; 30-a first adhesive layer; 40-a display module; 50-a buffer layer; 60-a first strengthening layer; 70-a protective layer; 80-a second adhesive layer; 90-second strengthening layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.
The flexible display cover plate can be applied to flexible display devices such as mobile phones, flat panels, notebook computers, televisions and the like. In order to satisfy the folding or curling function of the flexible display cover plate, the thickness of the glass layer in the flexible display cover plate is generally required to be reduced, so that the glass layer forms ultrathin glass capable of being bent or folded, but in the process of reducing the thickness of the glass layer, the edge of the glass layer is easy to generate defects, and after the glass layer is thinned, the edge of the glass layer is difficult to effectively polish, so that the glass layer is easy to crack in the bending or curling process.
Based on this, the embodiment of the application provides a flexible display cover plate, so as to avoid the phenomenon that the glass layer is easy to break in the process of bending or curling.
The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of this application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
For ease of understanding, first, the noun concepts related to the orientation referred to in the embodiments of the present application will be briefly described. In this application embodiment, the light-emitting direction of flexible display module can be understood as to the front side of flexible display module.
FIG. 1 is a top view of a glass layer in a flexible display cover provided in an embodiment of the present application; referring to fig. 1, the flexible display cover plate provided in the embodiment of the present application may include a glass layer 10 covering the display module, and a hardened layer covering the glass layer 10, wherein the glass layer 10 has flexibility, and the glass layer 10 is disposed on a front side of the flexible display module; as shown in fig. 1, a thinning region 12 and a supporting region 11 are provided on the glass layer 10, the supporting region 11 may be disposed around the thinning region 12, and the thickness of the supporting region 11 is greater than that of the thinning region 12, so that, during the processing of the glass layer 10, since the strength of the edge of the glass layer 10 is effectively increased, the occurrence of defects at the edge of the glass layer 10 is reduced, and thus, when the glass layer 10 is bent, curled or pressed, the risk of cracking at the edge of the glass layer 10 to break the entire glass layer 10 is also reduced. In addition, because glass layer 10 has better rigidity, consequently when bending or curling, crease or hunch-up are difficult to appear in glass layer 10's surface to through set up the sclerosis layer in one side that glass layer 10 kept away from display module assembly, utilize the advantage of the high rigidity and the high strength of sclerosis layer, can protect the glass layer, reduce the glass layer and be impaled by the sharp object in surface and pierce through, the fish tail or receive pressure fragmentation, be favorable to improving the structural reliability of flexible display apron.
In particular, with continued reference to fig. 1, the thickness of the support region 11 may be in the range 70 μm to 700 μm, for example: 70 μm, 100 μm, 150 μm, 210 μm, 300 μm, 500 μm, 600 μm, or 700 μm; the thickness of the thinned region 12 may be in the range of 20 μm to 100 μm, for example: 20 μm, 30 μm, 50 μm, 80 μm or 100 μm, which may be selected according to actual conditions, as long as the thickness of the support region 11 is greater than the thickness of the thinning region 12, and this arrangement may reduce the difficulty of polishing the support region 11, reduce the risk of cracking at the edge of the glass layer 10 during polishing, and further reduce the risk of cracking of the glass layer 10 during bending or curling.
The polishing of the support region 11 may be mechanical polishing or chemical polishing, wherein the chemical polishing is specifically acid washing with a chemical agent.
In addition, the support area and the thinning area are set to be different in thickness, so that the rebound force of the bent or curled glass layer can be reduced, and the bending or curling effect of the glass layer is better. Taking table 1 as an example, table 1 shows the rebound force of two different types of glass layers with equal thickness and different thickness, the area of which is 20 × 20cm, when the bending radius is 5 mm. Under the condition that the thickness of each part of the glass layer is the same, the rebound force of the glass layer with the thickness of 70 mu m is 42N when the bending radius is 5 mm; the rebound force of the glass layer with the thickness of 100 mu m when the bending radius is 5mm is 118N; the rebound force of the glass layer with the thickness of 120 mu m when the bending radius is 5mm is 211N; when the thickness of the support area and the thickness of the thinning area on the glass layer are different, when the thickness of the thinning area is 70 micrometers, the thickness of the support area is 100 micrometers, and the width of the support area is 3mm, the rebound force of the glass layer is 44N; when the thickness of the thinned region was 70 μm, the thickness of the support region was 120 μm, and the width of the support region was 3mm, the rebound force of the glass layer was 47N. It can be seen that, in the case that the thickness of the support region is different from the thickness of the thinning region, the rebound force of the glass layer during bending or curling is small, and the bending or curling effect of the glass layer is better.
TABLE 1
When the thinning area and the supporting area are formed on the glass layer, the following mode can be adopted, and the step one is adopted: covering one side edge of the glass to be thinned by edge sealing glue; step two: putting the sample subjected to edge sealing into a hydrofluoric acid or sodium hydroxide solution with a certain concentration to be corroded to a desired thickness; step three: and (5) dissolving the edge sealing glue by using a glue dissolving agent. The width of the edge sealing glue is the width of the supporting area, and can be set to be 0.2-5 mm. When the two sides of the glass layer need to be thinned, the steps can be repeated on the other side of the glass layer.
In the second step, after the glass layer 10 of the sample is etched in a hydrofluoric acid or sodium hydroxide solution with a certain concentration, a groove 13 is formed, a region corresponding to the groove 13 is a thinning region 12, a portion of the glass layer 10 other than the groove 13 is a supporting region 11 (as shown in fig. 2), when both sides of the glass layer 10 are thinned, the grooves 13 are formed on both sides of the glass layer, the thinning region 12 is a region of the glass layer 10 corresponding to the two grooves 13, and a portion of the glass layer 10 other than the region is the supporting region 11 (as shown in fig. 3); in addition, the sizes of the grooves on the two sides of the glass layer may be the same or different, and the present application is not limited thereto.
FIG. 4 is yet another top view of a glass layer in a flexible display cover provided in accordance with embodiments of the present application; the direction of the arrows in fig. 4 is the direction of curling; referring to fig. 4, in the process of forming the thinning area 12, the thinning area 12 may be a rounded rectangle structure, and the supporting area 11 surrounding the thinning area 12 may also be a rounded rectangle structure, the supporting area 11 may include two first supporting sections 110 and two second supporting sections 111, the two first supporting sections 110 are arranged in parallel, the two second supporting sections 111 are also arranged in parallel, and the two second supporting sections 111 are arranged perpendicular to the two first supporting sections 110; wherein the extending direction of the first support section 110 is the same as the curling direction of the glass layer 10, and the first support section 110 is also perpendicular to the axis of the glass layer 10 in the curling state. In addition, the thickness of the first support section 110 may be smaller than that of the second support section 111, and during the process of curling the glass layer, the thicknesses of the first support section 110 and the thinning region 12 located on the curling path are smaller than that of the second support section 111, so that when the radius of the curl is smaller, such as 5mm, the occurrence of fracture of the two first support sections 110 is reduced, and the occurrence of edge-produced breakage of the glass layer during the curling process can be reduced.
In other embodiments of the present application, the thickness of the first support section 110 may be equal to the thickness of the second support section 111, and then a hole structure may be disposed on the surface of the first support section 110 facing the hardened layer, and the hole structure may also improve the bending performance of the first support section 110, so that the risk of the first support section 110 cracking is reduced. It is understood that when the thickness of the first support section 110 is smaller than the thickness of the second support section 111, the surface of the first support section 110 facing the hardened layer may also be provided with a hole structure. Wherein the hole structure can be formed by etching a bamboo book pattern or other patterns.
FIG. 5 is yet another top view of a glass layer in a flexible display cover provided in accordance with an embodiment of the present application; the directions indicated by the two arrows in fig. 5 are the folding directions of the glass layer; referring to fig. 5, the supporting region 11 may further include a bending section 113 located on the crease of the glass layer, wherein the thickness of the bending section 113 is smaller than the thickness of the portion of the supporting region 11 except the bending section 113, and the thickness of the bending section 113 is greater than the thickness of the thinning region 12, that is, the thickness of the thinning region 12 is smaller than the thickness of the bending section 113 and smaller than the thickness of the portion of the supporting region 11 except the bending section 113; at this moment, when bending the glass layer, the glass layer uses the section 113 of bending that two symmetries set up and two sections of bending between 113 the part of attenuate district 12 to bend for the crease, and when the radius of bending is less, if during 5mm, the cracked condition of section 113 appearance of bending can reduce to can reduce the glass layer and take place by the broken condition of crease department output at the in-process of bending.
It should be noted that, a hole structure may be formed on the side of the bending section 113 facing the hardened layer by etching a bamboo book pattern or etching another pattern on the side of the bending section 113 facing the hardened layer, so as to improve the flexibility of the bending section.
In addition, the number of the bending sections 113 may be multiple, wherein a part of the bending sections 113 is located on the first side of the supporting region 11, the bending sections 113 located on the first side are distributed at intervals, another part of the bending sections 113 is located on the second side of the supporting region 11, the second side and the first side are symmetrically arranged, and the bending sections 113 located on the second side and the bending sections 113 located on the first side are also oppositely arranged; specifically, the number of the bending sections 113 on the first side or the second side of the supporting region 11 may be two (as shown in fig. 6), three, or more, so that when the glass layer is curled, the glass layer can be sequentially folded along the extending direction of the plurality of bending sections 113 corresponding to each other to complete the curling action; when bending is performed, a connecting line of any two oppositely arranged bending sections 113 is taken as a crease.
In particular, when the hardened layer is provided, the material of the hardened layer may include at least one of a polyurethane resin, an acrylic resin, an epoxy resin, an amino resin, an alkyd resin, and a silicone resin. And at least one of siloxane, silicon dioxide, aluminum oxide, zirconium oxide, graphene or diamond can be doped in the materials, so that the hardened layer can protect the glass layer from being pierced, scratched or cracked under pressure by a sharp object.
Fig. 7 is a schematic structural diagram of a flexible display cover according to an embodiment of the present application; as shown in fig. 7, a groove is formed on a side of the glass layer of the flexible display cover plate away from the display module 40, so that the glass layer forms the thinning region 12 and the supporting region 11, and a hardened layer 20 is formed on a side of the glass layer away from the display module 40, so that the hardened layer 20 has good strength and flexibility, and thus the glass layer can be protected and prevented from being scratched or crushed under pressure; the first adhesive layer 30 with the thickness of 1 μm to 200 μm and the elastic modulus of 1KPa to 1GPa is arranged on one side of the glass layer close to the display module 40, the first adhesive layer 30 is used for connecting the display module 40 with the glass layer, and the first adhesive layer 30 can be specifically an optically transparent adhesive and can be made of pressure-sensitive, thermosetting or ultraviolet-cured acrylic adhesive, epoxy adhesive, silica gel and other materials. In this embodiment, when the flexible display cover plate is bent or curled, the glass layer located in the cover plate is not cracked due to bending or curling due to the arrangement of the thinning region 12 and the supporting region 11, and the surface of the glass layer is not scratched or cracked under pressure due to the arrangement of the hardened layer 20.
Fig. 8 is a schematic structural diagram of another flexible display cover according to an embodiment of the present disclosure; as shown in fig. 8, in the flexible cover plate provided in the embodiment of the present application, when one side of the glass layer close to the display module is also provided with a groove, that is, both sides of the glass layer are provided with grooves, a thinning region 12 is formed between two grooves, a supporting region 11 is formed on the peripheral side of the thinning region 12, one side of the glass layer away from the display module is provided with a hardened layer 20, and the elastic modulus of the buffer layer 50 is smaller than the elastic modulus of the hardened layer 20. When the glass layer is impacted, the buffer layer 50 can absorb the impact force through deformation so as to reduce the influence on the display module 40 arranged below the buffer layer 50. It is understood that the elastic modulus of the buffer layer 50 is too large to affect the buffering performance, while too small to support the glass layer well may cause the tensile deformation of the surface of the glass layer to be too large and to be broken, so that the elastic modulus of the buffer layer 50 may be set to be between 10kPa and 100MPa and the elastic modulus of the hardened layer 20 may be set to be between 10MPa and 10GPa in a specific setting. When the flexible display cover plate is bent or curled, the glass layer arranged in the cover plate cannot be cracked due to bending or curling, the surface of the glass layer cannot be scratched or pressed to be cracked, and when the hardened layer 20 is subjected to large impact force, the glass layer arranged below the hardened layer 20 and the display module 40 are less affected.
FIG. 9 is a schematic view of another structure of a flexible display cover according to an embodiment of the present application; as shown in fig. 9, in the flexible cover plate provided by the embodiment of the present application, the hardened layer 20 may include a filling coating 21 filled in the groove, and the thickness of the filling coating 21 may be the same as the depth of the groove, so as to cover the area of the thinned region; the hardened hydrophobic coating 22 is arranged on one side, away from the display module 40, of the filling coating 21, specifically, the hardened hydrophobic coating 22 can cover the filling coating 21 and the support area, and the thickness of the hardened hydrophobic coating 22 is 1-20 μm, wherein the hardness of the hardened hydrophobic coating 22 is greater than or equal to the pencil hardness, the pencil hardness can be the common pencil hardness HB, the contact angle is greater than or equal to 100 degrees, and the friction coefficient is less than 0.1, so that the surface texture of the flexible display cover plate is ensured, and meanwhile, the glass layer can be protected.
In other embodiments of the present application, the thickness of the filling coating 21 may also be greater than the depth of the groove, and at this time, the filling coating 21 also covers the side of the support region away from the display module 40; at this time, the thickness of the filling coating layer 21 may be 0.01mm to 0.5mm, and the material of the filling coating layer 21 may include at least one of a urethane resin, an acrylic resin, an epoxy resin, an amino resin, an alkyd resin, and a silicone resin, and may also be doped with at least one of siloxane, silica, alumina, zirconia, graphene, or diamond. The above-mentioned filler coating 21 has good adhesion (4B in the hundred lattice test) and thus better adhesion to the glass layer; in addition, the filling coating layer 21 has good optical properties (transmittance > 85% and haze < 5%), so that the picture displayed on the display module 40 can be clearly observed by a user.
The material of the filler coating may be the same as that of the hardened layer when only the hardened layer is provided on the glass layer.
Fig. 10 and 11 are schematic structural diagrams of a flexible display cover according to an embodiment of the present application, as shown in fig. 10 and 11, in this embodiment, a first reinforcing layer 60 is further attached to a side of the hardened layer 20 facing away from the glass layer 10, and the first reinforcing layer 60 has good strength and flexibility; when the first reinforcing layer 60 is specifically arranged, the first reinforcing layer 60 can be a polymer film with the thickness of 0.01-0.2mm, the light transmittance of the polymer film is greater than or equal to 85%, the elastic modulus of the polymer film is between 1GPa-15GPa, and the polymer film can be at least one of polyimide, polyethylene terephthalate, aramid fiber, polyethylene naphthalate, polycarbonate, polymethyl methacrylate and thermoplastic polyurethane elastomer rubber. The first strengthening layer 60 may protect the outer side of the glass layer 10 by one more layer to prevent the surface of the glass layer from being punctured, scratched, or crushed by a sharp object.
Fig. 12 and 13 are schematic views illustrating another structure of a flexible display cover according to an embodiment of the present invention, as shown in fig. 12 and 13, the embodiment of the present invention further provides another flexible display cover, which includes a glass layer 10 having a thickness of a thinning region smaller than that of a supporting region, and a protective layer 70 covering the glass layer, where the protective layer 70 is configured to prevent the glass layer 10 from contacting with an edge or a frame of a middle frame of a display device too small or directly, so as to reduce the occurrence of cracks in the glass layer 10. In addition, a first adhesive layer 30 and a second adhesive layer 80 are respectively arranged on two sides of the protective layer 70, the first adhesive layer 30 is used for connecting the protective layer 70 with the display module 40, the second adhesive layer 80 is used for connecting the second reinforcing layer 90 with the protective layer 70, and in addition, a hardening layer 20 can be arranged on one side of the second reinforcing layer 90, which is far away from the protective layer 70; thus, the risk of defects occurring at the edge of the glass layer 10 during the processing of the glass layer 10 is reduced, and the strength of the edge of the glass layer 10 is effectively increased, so that the risk of breakage of the glass layer 10 when bent, curled or pressed can be reduced. One side that display module assembly 40 was kept away from to glass layer 10 is equipped with sclerosis layer 20 and second strengthening layer 90, and sclerosis layer 20 and second strengthening layer 90 have better hardness and intensity, can protect glass layer 10, and the surface that reduces glass layer 10 is impaled by sharp object, the fish tail or receives the cracked risk of pressure, is favorable to improving the structural reliability of flexible display apron.
It should be noted that the second strengthening layer and the first strengthening layer can have the same structure and material; similarly, the structure and the selected material of the first adhesive layer and the second adhesive layer can be the same.
The embodiment of the application also provides a flexible display device, which comprises a flexible display cover plate and a flexible display module, wherein when the flexible display device is a foldable device, the flexible display cover plate and the flexible display module can be folded together, and when the flexible display device is a rollable device, the flexible display cover plate and the flexible display module can be rolled together. The flexible display cover plate is arranged above the flexible display module and can be used for protecting the flexible display module from being damaged, and the glass layer in the flexible display cover plate is provided with the thinning area and the supporting area, so that the glass layer in the flexible display cover plate is not easy to crack in the curling or folding process, and the reliability of the flexible display device can be improved.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (19)
1. A flexible display cover plate is used for covering a display module and is characterized by comprising a glass layer covering the display module and a hardening layer covering the glass layer;
the glass layer is provided with a thinning area and a supporting area surrounding the periphery of the thinning area, wherein the thickness of the thinning area is smaller than that of the supporting area.
2. The flexible display cover according to claim 1, wherein the thickness of the thinned region is 20 μm to 100 μm, the width of the support region is 0.2mm to 5mm, and the thickness of the support region is 70 μm to 700 μm.
3. The flexible display cover according to claim 1 or 2, wherein a groove is formed on a side of the glass layer facing away from the display module, and the area of the glass layer corresponding to the groove is formed with the thinning area;
or a groove is formed in one side, close to the display module, of the glass layer, and the thinning area is formed in the area, corresponding to the groove, of the glass layer;
or, the glass layer is close to one side of display module assembly and the glass layer deviates from one side of display module assembly all is equipped with the recess, the glass layer with the region that the recess corresponds is formed with the region of reducing.
4. The flexible display cover according to claim 1, wherein the thinning area has a rounded rectangular structure, the support area comprises two first support sections along the curling direction of the glass layer, and a second support section located between the two first support sections, wherein the thickness of the first support section is less than or equal to the thickness of the second support section, and the extending direction of the first support section is perpendicular to the axis direction of the curling of the glass layer.
5. The flexible display cover according to claim 1, wherein the support area comprises a bent segment on the fold of the glass layer, wherein the thickness of the bent segment is less than the thickness of the portion of the support area other than the bent segment.
6. The flexible display cover according to claim 1, wherein the material of the hardened layer is at least one of a polyurethane resin, an acrylic resin, an epoxy resin, an amino resin, an alkyd resin, and a silicone resin.
7. The flexible display cover according to claim 6, wherein the material of the hardened layer is doped with at least one of siloxane, silica, alumina, zirconia, graphene or diamond.
8. The flexible display cover sheet of claim 1, further comprising a first adhesive layer disposed between the display module and the glass layer for connecting the glass layer to a display module.
9. The flexible display cover sheet of claim 8, further comprising a buffer layer disposed between the first adhesive layer and the glass layer.
10. The flexible display cover of claim 9, wherein the buffer layer has a modulus of elasticity less than the modulus of elasticity of the stiffening layer.
11. The flexible display cover according to any one of claims 1-10, further comprising a first reinforcing layer disposed on a side of the stiffening layer facing away from the display module.
12. The flexible display cover according to claim 11, wherein the first reinforcing layer is a polymer film having a thickness of 0.01-0.2 mm.
13. The flexible display cover sheet according to claim 11 or 12, wherein the polymer film is at least one of polyimide, polyethylene terephthalate, aramid, polyethylene naphthalate, polycarbonate, polymethyl methacrylate, and thermoplastic polyurethane elastomer rubber.
14. The flexible display cover plate of claim 3, wherein the hardened layer comprises a filling coating and a hardened hydrophobic coating, the filling coating is disposed on the thinning area of the glass layer facing away from one side of the display module, and the hardened hydrophobic coating is disposed on the side of the filling coating facing away from the thinning area.
15. The flexible display cover according to claim 14, wherein the filler coating has a thickness of 0.001mm to 0.05 mm.
16. The flexible display cover according to claim 14, wherein the hardened hydrophobic coating has a thickness of 1-20 μ ι η.
17. The flexible display cover according to claim 1, further comprising a protective layer for wrapping the glass layer.
18. The flexible display cover of claim 17, further comprising a second reinforcing layer between the stiffening layer and the protective layer, and a second bonding layer between the second reinforcing layer and the protective layer.
19. A flexible display device comprising a flexible display cover according to any one of claims 1-18.
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| CN202010732710.9A CN114005356A (en) | 2020-07-27 | 2020-07-27 | Flexible display cover plate and flexible display device |
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| CN202010732710.9A CN114005356A (en) | 2020-07-27 | 2020-07-27 | Flexible display cover plate and flexible display device |
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