CN111756889A - Cover plate and mobile terminal - Google Patents
Cover plate and mobile terminal Download PDFInfo
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- CN111756889A CN111756889A CN201910251307.1A CN201910251307A CN111756889A CN 111756889 A CN111756889 A CN 111756889A CN 201910251307 A CN201910251307 A CN 201910251307A CN 111756889 A CN111756889 A CN 111756889A
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- 230000000694 effects Effects 0.000 abstract description 13
- 239000010410 layer Substances 0.000 description 99
- 239000011521 glass Substances 0.000 description 27
- 238000005452 bending Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 9
- 239000005345 chemically strengthened glass Substances 0.000 description 7
- 238000005530 etching Methods 0.000 description 6
- 238000003426 chemical strengthening reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 241001422033 Thestylus Species 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000003698 laser cutting Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000012780 transparent material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/0206—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings
- H04M1/0208—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings characterized by the relative motions of the body parts
- H04M1/0214—Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/0206—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings
- H04M1/0208—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings characterized by the relative motions of the body parts
- H04M1/0214—Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
- H04M1/0216—Foldable in one direction, i.e. using a one degree of freedom hinge
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The application provides a apron and mobile terminal, this apron is used for covering the flexible screen, and wherein, this flexible screen is collapsible screen, and it includes first display area, second display area and connects the bendable district of first display area and second display area. The cover plate includes a rigid layer for covering the first display area, the second display area, and the bendable area. The rigid layer is provided with a thinning area at a position corresponding to the bendable area, so that the thickness of the part of the rigid layer covering the first display area and the second display area is larger than that of the part of the rigid layer covering the bendable area, and the flexibility of the part of the rigid layer covering the bendable area is larger than that of the part of the rigid layer covering the first display area and the second display area. So that the cover plate can be folded along with the flexible screen when covering the flexible screen. The thickness of the part of the rigid layer covering the first display area and the second display area can be made thicker so as to enhance the protection effect of the cover plate.
Description
Technical Field
The application relates to the technical field of mobile terminals, in particular to a cover plate and a mobile terminal.
Background
The homogeneity of smart phones is increasingly serious nowadays, and in order to seek differentiation, various large mobile phone manufacturers are distributed in the field of foldable smart phones. However, foldable smart phones have not been commercialized to date, mainly because the reliability of the complete machine and the user experience cannot meet the commercialization requirements. The foldable mobile phone can be simply divided into a folding-in scheme and a folding-out scheme, wherein the folding-out scheme is closer to the existing mobile phone in the market in the folded state and conforms to the existing use habit of the consumer, so the foldable mobile phone is focused by the mobile phone manufacturer. However, the cover plate of the display screen is a key technical problem in the development process of the folding-out scheme, because the display screen is arranged on the outer side, the cover plate is required to meet the requirements of high hardness, scratch resistance, high strength, impact resistance and the like, and the cover plate can be repeatedly folded to meet the key requirements of a foldable smart phone, such as appearance, hand feeling, touch screen operation and the like while having enough protection capability for the display screen. However, the cover plates in the prior art cannot simultaneously meet the above requirements.
Disclosure of Invention
The application provides a cover plate and a mobile terminal, which are used for improving the protection capability of the cover plate on a flexible screen and meeting the key requirement of bending.
In a first aspect, a cover plate is provided for covering a flexible screen, wherein the flexible screen is a foldable screen and includes a first display area, a second display area, and a bendable area connecting the first display area and the second display area. And the cover plate of the present application includes a rigid layer for covering the first display area, the second display area, and the bendable area. And when the rigid layer is arranged, the rigid layer is provided with a thinning area at the position corresponding to the bendable area, so that the thickness of the part of the rigid layer covering the first display area and the second display area is larger than that of the part of the rigid layer covering the bendable area, and the rigid layer is thinned through the arranged thinning area, so that the flexibility of the part of the rigid layer covering the bendable area is larger than that of the part of the rigid layer covering the first display area and the second display area. So that the cover plate can be folded along with the flexible screen when covering the flexible screen. When adopting this kind of structure, can cover the rigidity layer than what do in the thickness of the part of first display area and second display area to the protection effect of reinforcing apron, simultaneously, the pliability of rigidity layer is guaranteed to the rigidity layer attenuate through the attenuate region that sets up.
When the thinning area is specifically arranged, the thinning area can be an integral groove, and different modes such as a microstructure and the like can also be arranged in the thinning area.
When the rigid layer is thinned, different microstructures can be formed. For example, the thinning is performed by adopting a mode of arranging grooves, or the thinning is performed by arranging a grid structure. These will be described below.
When the thinning area is specifically arranged, the microstructure is a plurality of grooves which are arranged at intervals, and the length direction of each groove is parallel to the axis direction around which the flexible screen is folded. In particular the plurality of grooves are arranged, the plurality of grooves are arranged in a direction perpendicular to an axis about which the flexible screen is folded.
When the grooves are specifically provided, the spacing distance between adjacent grooves is in the range of 50 to 1000 μm. The influence on the strength of the rigid layer is reduced as much as possible on the premise of meeting the bending requirement.
When the groove is specifically provided, the width of the groove is in the range of 50 μm to 1000 μm. As the diameter of the nib of the common touch pen is more than or equal to 0.7mm, when the groove with the width is adopted, the concave-convex feeling of the touch pen in use is reduced.
As for the shape of the groove, the cross section of the groove is trapezoidal or rectangular. Other shapes may of course be used.
When the groove is specifically arranged, the thickness of the bottom wall of the groove is in the range of 20-100 μm. Has good flexibility and certain strength.
The grooves can be realized by etching or laser cutting.
Of course, the microstructure is a grid microstructure except for the groove pattern described above. The rigid layer is thinned through the grid microstructure, and meanwhile, the flexibility of the rigid layer is improved.
When the grid microstructure is specifically arranged, the grid microstructure is a plurality of bulges; the plurality of protrusions are arranged in an array. The protrusion may be a cylindrical protrusion or a rectangular protrusion.
In particular, when the protrusions are provided, the height of the protrusions is lower than the surface of the rigid layer.
In addition, the cover plate also comprises a flexible layer at least filled in the thinning area. The flexibility of the thinning area is ensured and the consistency of appearance is improved by covering the thinning area through the arranged flexible layer.
When the flexible layer is specifically provided, the refractive index of the flexible layer is the same as that of the rigid layer. If the microstructures are filled with a flexible optical glue or other transparent material with good flexibility, the microstructures are ensured to be invisible to the eye, and the integrity of the appearance is maintained.
When the rigid layer is specifically provided, different materials can be used, such as glass or tempered glass.
In particular, when the rigid layer is provided, the thickness of the rigid layer is in the range of 100 to 500 μm. Ensuring good protection effect of the rigid layer. More specifically, the thickness of the rigid layer may be selected in the range of 150 μm to 300 μm.
In a second aspect, a foldable display module is provided, which includes a flexible screen and any one of the above cover plates; wherein,
the flexible screen comprises a first display area, a second display area and a bendable area which is connected with the first display area and the second display area;
the cover plate comprises a rigid layer covering the first display area, the second display area and the bendable area, wherein the thinned area of the rigid layer covers the bendable area. The rigid layer is thinned through the arranged thinning area, so that the flexibility of the part of the bendable area covered by the rigid layer is larger than the flexibility of the parts of the first display area and the second display area covered by the rigid layer. So that the cover plate can be folded along with the flexible screen when covering the flexible screen. When adopting this kind of structure, can cover the rigidity layer than what do in the thickness of the part of first display area and second display area to the protection effect of reinforcing apron, simultaneously, the pliability of rigidity layer is guaranteed to the rigidity layer attenuate through the attenuate region that sets up.
In a third aspect, a mobile terminal is provided, which includes a housing, a flexible screen disposed on the housing, and a cover plate disposed on any one of the flexible screens. The rigid layer is thinned through the arranged thinning area, so that the flexibility of the part of the bendable area covered by the rigid layer is larger than the flexibility of the parts of the first display area and the second display area covered by the rigid layer. So that the cover plate can be folded along with the flexible screen when covering the flexible screen. When adopting this kind of structure, can cover the rigidity layer than what do in the thickness of the part of first display area and second display area to the protection effect of reinforcing apron, simultaneously, the pliability of rigidity layer is guaranteed to the rigidity layer attenuate through the attenuate region that sets up.
Drawings
Fig. 1 is a schematic structural diagram of a mobile terminal according to an embodiment of the present application;
fig. 2 is a schematic folding diagram of a mobile terminal according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a foldable display module according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a cover plate according to an embodiment of the present disclosure;
fig. 5 is a schematic view of a microstructure provided in an embodiment of the present application;
fig. 6a to 6d are flow charts of the preparation of microstructures provided in the embodiments of the present application;
FIG. 7 is a schematic view of another microstructure provided in the embodiments of the present application;
FIG. 8 is a schematic view of another microstructure provided in an embodiment of the present application;
fig. 9 is a schematic height view of a microstructure provided in an embodiment of the present application.
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.
For convenience of understanding the cover panel provided in the embodiments of the present application, an application scenario of the cover panel is first described, where the cover panel is applied to a foldable mobile terminal, such as a mobile phone, a tablet computer, and other common mobile terminals. FIG. 1 illustrates a mobile terminal when it is unfolded; fig. 2 shows a folded shape of the mobile terminal. First, as shown in fig. 1, when the mobile terminal is unfolded, the case 30 of the mobile terminal is unfolded; meanwhile, the foldable display module 10 disposed in the housing 30 is also unfolded. As illustrated in fig. 2, when the mobile terminal is folded, the case 30 of the mobile terminal is also folded; meanwhile, the foldable display module 10 is also folded. It should be understood that although the foldable display module 10 shown in fig. 2 is located at the exposed side when the mobile terminal is folded, other embodiments of the present application may provide the mobile terminal with the housing 30 exposed and the foldable display module 10 located at the inner side when the mobile terminal is folded. As can be seen from the above description, the foldable display module 10 can be folded following the folding of the mobile terminal.
The foldable display module 10 may include a flexible screen, a touch layer and a cover plate. The flexible screen can adopt an integrated flexible display screen, and can also adopt two rigid screens and a spliced display screen formed by the flexible screens positioned between the two rigid screens. The touch layer (not shown) also adopts a flexible and foldable structure. As shown in fig. 3, no matter which way the flexible screen adopts, the flexible screen includes three parts, which are respectively: the display device comprises a first display area 11, a second display area 13 and a bendable area 12 connecting the first display area 11 and the second display area 13. As shown in the figure, when the mobile terminal is unfolded, the first display region 11, the second display region 13 and the bendable region 12 are connected to form a whole screen. The first display area 11 and the second display area 13 correspond to two plane areas of the folded flexible screen of the mobile terminal, and the bendable area 12 corresponds to a bending area of the folded flexible screen of the mobile terminal.
The cover plate provided by the embodiment of the application is used for covering the flexible screen, and when the flexible screen includes the first display area 11, the second display area 13 and the bendable area 12, the cover plate is also provided with structures corresponding to the first display area 11, the second display area 13 and the bendable area 12. As shown in fig. 4, fig. 4 illustrates a structure of a cover plate provided by an embodiment of the present application, wherein the cover plate includes a rigid layer 20, and referring to fig. 3 and 4 together, the rigid layer 20 is used for covering the first display area 11, the second display area 13, and the bendable area 12. For convenience of description, portions of the rigid layer 20 covering the first display area 11, the second display area 13, and the bendable area 12 are named a first rigid area 21, a second rigid area 23, and a flexible area 22, respectively. When the rigid layer 20 is specifically provided, the rigid layer 20 needs to have a certain strength in order to protect the flexible panel, and the rigid layer 20 needs to have a certain flexibility in order to bend the flexible panel. In order to realize that the rigid layer 20 meets the requirements of rigidity and flexibility at the same time, the rigid layer 20 provided in the embodiment of the present application is provided with a thinned region at a position (the flexible region 22) corresponding to the bendable region 12, that is, the rigidity of the rigid layer 20 is reduced by reducing the thickness (the thickness of the first rigid region 21 and the thickness of the second rigid region 23 are greater than the thickness of the flexible region 22) of the position covering the bendable region 12, so as to improve the flexibility of the rigid layer 20, so that the flexibility of the flexible region 22 is greater than the flexibility of the first rigid region 21 and the second rigid region 23, and thus the rigid layer 20 can achieve the flexibility required when being bent.
Specifically, when the rigid layer 20 is provided, it is made of glass or other material having a certain rigidity, and if the rigid layer 20 is made of chemically strengthened glass, the chemically strengthened glass is generally made of high alumina silica glass having a thickness of 3mm or less, and high alumina silica glass (Al2O 3% or more and 15 w%) containing sodium oxide (Na2O) is immersed in molten potassium nitrate salt (380 to 450 ℃) and left standing for several hours, so that potassium ions (K +) having a large ionic radius/volume in the molten salt and sodium ions (Na +) having a small ionic radius/volume in the glass substrate are Ion-exchanged (Ion-Exchange), thereby naturally generating a compression effect on the glass surface, forming a pressure layer on the glass surface, and generating a tensile stress in the glass. The compression stress layer formed on the glass surface layer can inhibit the expansion of surface microcracks to a certain extent, and can play a role in improving the glass strength, so that the flexible screen can be well protected.
Since the chemical strengthening treatment forms a compressive stress layer (CS) on the surface of the glass, such compressive stress can cancel out the tensile stress that the glass receives on the outside in the bent state. When the tensile stress of the outer side of the glass is smaller than CS during bending, the glass can be bent and cannot be broken. After the chemically strengthened glass is subjected to the chemical strengthening treatment, the CS value of the surface is generally between 700 and 1000 MPa. Assuming that the bending radius R5mm is 70GPa and the outer tensile stress after bending of a chemically strengthened glass having a thickness of 100 μm is 700MPa and smaller than the CS value after the chemical strengthening treatment, the glass having a modulus of 70GPa and a thickness of less than 100 μm can be folded in two at the bending radius R5mm without breaking after the chemical strengthening without defects such as microcracks. Therefore, in the concrete production of the rigid layer 20, the rigid layer 20 needs to have a certain thickness, but the thicker the glass means the deeper the cutting at the time of thinning, the greater the process realization difficulty factor, and the bending performance is also deteriorated, so that the thickness (the thickness of the first rigid region 21 and the second rigid region 23) T of the rigid layer 20 satisfies, in the concrete arrangement of the rigid layer 20: t is more than or equal to 100 mu m and less than or equal to 500 mu m, thereby ensuring that the rigid layer 20 can meet the requirement of protecting the flexible screen. Specifically, the thickness of the rigid layer 20 may be varied to be 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, or the like. In a more specific embodiment, the thicknesses of the first rigid region 21 and the second rigid region 23 may be between 150 μm and 300 μm, such as 150 μm, 200 μm, 250 μm, 300 μm, and the like, so as to ensure the protection of the flexible screen by the rigid layer 20 and reduce the difficulty in thinning.
However, when the thickness of the chemically strengthened glass is relatively large, the flexibility thereof is reduced, and thus the rigid layer 20 provided in the embodiment of the present application is locally thinned at the portion (flexible region 22) covering the bendable region 12. When the thinning region is specifically formed, a structure that a groove is formed by directly thinning the thickness can be adopted, or a microstructure is arranged in the groove, and at this time, the thinning region is provided with the microstructure, which is respectively described below with reference to the accompanying drawings.
First, as shown in fig. 5, fig. 5 shows a specific microstructure. The thinning region is provided with a plurality of grooves 221, that is, the microstructure is a plurality of grooves 221, and the grooves 221 are arranged at intervals, so as to form a structure of alternating recesses and protrusions 223. The spaced projections 223 between the two grooves 221 are defined as ribs 222 for convenience of description, the ribs 222 and the grooves 221 are alternately arranged in the thinned region as shown in fig. 5, and the length direction of the grooves 221 is parallel to the axial direction around which the flexible panel is folded. In conjunction with the structure shown in fig. 4, taking the placement direction of the cover plate in fig. 4 as a reference direction, the length direction of the cover plate is defined as the horizontal direction in fig. 4, and the length direction of the groove 221 is perpendicular to the length direction of the cover plate. As can be seen from fig. 5, when the groove 221 is provided in the thinned region, the thickness of the rigid layer 20 can be reduced, and the thinner the thickness t is, the more advantageous the bending performance is, but the impact resistance is, the lower the thickness is, the impact resistance is, and the smaller the elastic modulus of the glass is, the 50 μm and 70 μm thickness of the glass is, the more the glass is bent at the radius of R5mm, the outer tensile stress is 350MPa and 490MPa, and the thickness t of the bottom wall of the groove 221 is in the range of 20 μm to 100 μm, such as 20 μm, 30 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 80 μm, 90 μm, 100 μm, and the like, when the groove 221 is provided in the present application, the thickness t of the bottom wall of the groove 221 is in the range of 20 μm to 100 μm, considering that the groove is locally thicker the glass is, and the 70 μm thickness is, and the stress. The thinning area can be guaranteed to have enough flexibility to meet the bending requirement, and meanwhile, the rigidity is certain to meet the impact resistance.
With continued reference to fig. 5, during grooving, as shown in fig. 4, a plurality of grooves 221 and ribs 222 are provided in the thinned region, and these grooves 221 and ribs 222 create a relief on the rigid layer 20. Of course, the larger the width of the groove 221 is, the more advantageous the bending of the flexible region 22 is, but the impact resistance is lowered, and when the cover plate is covered on the mobile terminal, a concave-convex touch feeling is generated when a stylus touches these regions. Therefore, in order to improve the impact resistance and the touch effect of the thinned region, the embodiment of the present application defines the interval of the groove 221. If the diameter of the tip of the stylus is more than or equal to 0.7mm, the width d of the groove 221 is within the range of 50 μm to 1000 μm, such as 50 μm and 100 μm, when the groove 221 is formed to avoid the convex-concave touch feeling during writing on the touch screenμm、200μm、300μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, and the like. When the stylus pen point writes in the groove 221 area, the diameter of the stylus pen point is larger than or slightly smaller than the width of the groove 221, so that the concave-convex feeling caused by the groove 221 can be reduced, and the writing effect is improved. The provision of the groove 221 having the above width also improves the impact resistance of the thinned region.
With continued reference to fig. 5, when the grooves 221 and the ribs 222 are alternately arranged, the smaller the spacing distance between adjacent grooves 221 (the width of the ribs 222), the better the bending effect on the flexible region 22. Therefore, in combination with T, t and D, the width D of the ridge 222 is set to be in the range of 50 μm to 1000 μm, such as different widths of 50 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, and the like.
Specifically, when the groove 221 is provided, the cross section of the groove 221 is in different shapes such as trapezoid or rectangle, and the corresponding rib 222 is also in a shape of rectangle or trapezoid, for example, in the structure shown in fig. 5, the groove 221 and the rib 222 are both in an isosceles trapezoid shape. In the structure shown in fig. 5, the groove 221 and the surface of the rigid layer 20 (the surface facing away from the installation surface of the groove 221) have a certain included angle α, and the α corresponds to different angles when different processes are adopted, for example, when a laser cutting method is adopted, a microstructure with higher dimensional accuracy can be obtained, and at this time, α can be approximately 90 °. However, when the etching process is adopted, due to the limitation of the etching process, alpha is between 20 and 60 degrees, such as different angles of 20 degrees, 35 degrees, 40 degrees, 45 degrees, 60 degrees and the like. The grooves 221 formed by any process may be applied to the embodiment of the present application.
In addition, the cover plate provided by the embodiment of the application can further include a flexible layer 24 filled at least in the thinned region. When the thinning area is provided with the groove 221, the flexible layer 24 covers the groove 221, so that the flexibility of the thinning area is ensured and the consistency of appearance is improved when the flexible layer 24 is arranged to cover the thinning area. In particular the flexible layer 24 is provided, as shown in fig. 6d, the flexible layer 24 is provided at the side of the rigid layer 20 where the groove 221 is provided and covers the surface. And the flexible layer 24 is partially filled in the groove 221, and the groove 221 is filled, so that the consistency of the appearance of the cover plate is improved, the concave-convex feeling of the rigid layer 20 can be further reduced by the arranged flexible layer 24, and the touch effect is improved.
When the flexible layer 24 is specifically arranged, the refractive indexes of the flexible layer 24 and the rigid layer 20 are the same or approximately the same, so that the display effect of the foldable display module 10 is improved. In addition, the flexible layer 24 may be made of different materials, such as flexible optical glue or other transparent materials with good flexibility to fill the microstructures, ensuring that the microstructures are not visible and the integrity of the appearance is maintained.
In order to facilitate understanding of the cover plate provided in the embodiments of the present application, a process for manufacturing the same will be described below with reference to fig. 6a to 6 d. Firstly, as shown in FIG. 6a, high Al-Si series flat chemically strengthened glass with a corresponding shape is cut according to the design size of a terminal product, and T is more than or equal to 100um and less than or equal to 500 um. As shown in fig. 6b, by using a glass etching process, a grid microstructure of the longitudinal grooves 221, a thickness of the glass, and a form of the microstructure are processed in the bending region of the glass surface, and specifically, dimensions of the microstructure may refer to the description of the dimensions of the microstructure in the above. As shown in FIG. 6c, the etched glass cover plate is chemically strengthened, and the CS value after the strengthening treatment is ensured to be equal to or more than 700MPa by controlling the strengthening treatment conditions. As shown in fig. 6d, on the side of the glass with the groove 221 microstructures, the microstructures are filled with a flexible optical glue or other transparent material with good flexibility, having the same or similar refractive index as the glass substrate, to ensure that the microstructures are not visible and the integrity of the appearance is maintained.
In order to more intuitively understand the performance parameters of the cover plate provided in the embodiment of the present application, simulation is performed by taking the design parameters of the microstructure (microstructure formed by etching) in the flexible region 22 in the above embodiment as an example, and the result is shown in table 1 below, and the mechanical simulation verification result shows that the tensile stress at the outer side of the cover plate in the bending state can be controlled within a range of 500 to 700MPa and is smaller than the CS value of the chemically strengthened glass, so that the rigid layer 20 can meet the key requirement of bending. In addition, the thickness of the glass cover plate is 200-400 um, and compared with an ultrathin glass cover plate with the thickness of 100um, the rigidity and the external force impact resistance of the glass cover plate are obviously improved, and the protection capability of the display screen is effectively improved.
| No. | T(mm) | t(mm) | D(mm) | d(mm) | α | LE.Max | Tensile stress (MPa) |
| 1 | 0.2 | 0.06 | 0.2 | 0.8 | 40° | 0.00787 | 574.51 |
| 2 | 0.2 | 0.07 | 0.1 | 0.8 | 40° | 0.00863 | 629.99 |
| 3 | 0.3 | 0.06 | 0.1 | 0.8 | 40° | 0.00841 | 613.93 |
| 4 | 0.4 | 0.06 | 0.1 | 0.8 | 40° | 0.00955 | 697.15 |
TABLE 1
When the microstructure is formed by laser cutting, the alpha angle is larger (more than 60 degrees), the boundary condition of etching processing can be broken through, and the dimension precision and the processing efficiency are high. The simulation results in table 2 show that the larger the angle α, the lower the stress at bending, i.e., t is, but the larger the tensile stress is, mainly because the angle α is small.
| No. | T(mm) | t(mm) | D(mm) | d(mm) | α | LE.Max | Tensile stress (MPa) |
| 1 | 0.2 | 0.07 | 0.5 | 0.5 | 90° | 0.00983 | 717.59 |
| 2 | 0.2 | 0.06 | 0.5 | 0.5 | 40° | 0.01198 | 874.54 |
TABLE 2
Of course, thinning may be achieved in other ways than by the grooves 221 described above. As shown in fig. 7 and 8, fig. 7 and 8 show another structure. In the structures shown in fig. 7 and 8, the thinning region adopts a grid microstructure, and when the grid microstructure is specifically arranged, the grid microstructure is a plurality of projections 223, and the projections 223 are arranged in an array. When the projection 223 is specifically provided, the shape of the projection 223 may be different. As shown in fig. 7, the projection 223 may be a cylindrical projection 223, and the projection 223 shown in fig. 8 is a rectangular parallelepiped projection 223. Of course, fig. 7 and 8 are only a specific example, and the protrusions 223 provided in the embodiments of the present application may also have different shapes such as a prism shape, a triangle shape, and the like.
In addition, when the height of the protrusion 223 is set, different manners may be adopted, for example, according to the principle that the stress is lowest and the impact resistance is highest when bending, as shown in fig. 9, the height H of the protrusion 223 is lower than the surface of the rigid layer 20, and in concrete cases, the value of H may be set according to actual needs, and may be reduced to 0 at the lowest, that is, the entire bending region 12 may be thinned without protrusion. As can be seen from the above description, the bendable region 12 can be thinned by using different microstructures, and the rigidity requirement of the thinned region is also ensured, so that the entire rigid layer 20 can be protected by using a thicker thickness to protect the foldable display module 10.
As shown in fig. 3, the embodiment of the present application further provides a foldable display module 10, which includes a flexible screen and the cover plate described in any one of the above; the flexible screen comprises a first display area 11, a second display area 13 and a bendable area which is connected with the first display area 11 and the second display area 13; the cover plate comprises a rigid layer 20 covering the first display area 11, the second display area 13 and the bendable area 12, wherein a thinned area 22 of the rigid layer 20 covers the bendable area 12. The rigid layer 20 is thinned by the thinning area, so that the flexibility of the part of the rigid layer 20 covering the bendable region is greater than the flexibility of the parts of the rigid layer covering the first display region 11 and the second display region 13. So that the cover plate can be folded along with the flexible screen when covering the flexible screen. When the structure is adopted, the thickness of the part of the rigid layer 20 covering the first display area 11 and the second display area 13 can be made thicker so as to enhance the protection effect of the cover plate, and meanwhile, the flexibility of the rigid layer 20 is ensured by thinning the rigid layer 20 through the arranged thinning area.
With continuing reference to fig. 1 and fig. 2, the present application further provides a mobile terminal, which includes a housing 30, a flexible screen 10 disposed on the housing 30, and a cover plate disposed on the flexible screen 10. The rigid layer 20 is thinned by the thinning area, so that the flexibility of the part of the rigid layer 20 covering the bendable region is greater than the flexibility of the parts of the rigid layer covering the first display region 11 and the second display region 13. So that the cover plate can be folded along with the flexible screen when covering the flexible screen. When the structure is adopted, the thickness of the part of the rigid layer 20 covering the first display area 11 and the second display area 13 can be made thicker so as to enhance the protection effect of the cover plate, and meanwhile, the flexibility of the rigid layer 20 is ensured by thinning the rigid layer 20 through the arranged thinning area.
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 (16)
1. A cover plate is used for covering a flexible screen, and the flexible screen comprises a first display area, a second display area and a bendable area for connecting the first display area and the second display area; wherein the cover plate comprises a rigid layer for covering the first display area, the second display area and the bendable area; the rigid layer is provided with a bendable area, and the position of the rigid layer corresponding to the bendable area is provided with a thinning area;
the flexibility of the part of the rigid layer covering the bendable region is larger than that of the part of the rigid layer covering the first display region and the second display region.
2. The cover sheet according to claim 1, wherein the thinned regions are provided with microstructures.
3. The cover plate of claim 2, wherein the microstructure is a plurality of grooves, the grooves are arranged at intervals, and the length direction of the grooves is parallel to the axial direction around which the flexible screen is folded.
4. The cap plate of claim 3, wherein the adjacent grooves are spaced apart by a distance in the range of 50 μm to 1000 μm.
5. The cover plate according to claim 3 or 4, wherein the width of the groove is in the range of 50 to 1000 μm.
6. The cover plate according to any one of claims 2 to 5, wherein the thickness of the bottom wall of the groove is in the range of 20 μm to 100 μm.
7. The cover plate according to any one of claims 2 to 6, wherein the cross section of the groove is trapezoidal, rectangular or circular.
8. The cover sheet of claim 2, wherein the microstructures are grid microstructures.
9. The cover sheet of claim 8, wherein the grid microstructure is a plurality of protrusions; the plurality of protrusions are arranged in an array.
10. The cover sheet according to claim 8 or 9, wherein the height of the protrusions is lower than the surface of the rigid layer.
11. The cover sheet according to any one of claims 1 to 10, further comprising a flexible layer filled at least in the thinned region.
12. The cover sheet of claim 11, wherein the flexible layer and the rigid layer have the same refractive index.
13. The cover sheet according to any one of claims 1 to 12, wherein the thickness of the rigid layer is in the range of 100 to 500 μm.
14. The cover sheet according to claim 13, wherein the rigid layer has a thickness in the range of 150 to 300 μm.
15. A foldable display module, comprising a flexible screen and a cover plate according to any one of claims 1 to 14; wherein,
the flexible screen comprises a first display area, a second display area and a bendable area which is connected with the first display area and the second display area;
the cover plate comprises a rigid layer covering the first display area, the second display area and the bendable area, wherein the thinned area of the rigid layer covers the bendable area.
16. A mobile terminal, comprising a housing and a flexible screen disposed on the housing, further comprising a cover plate according to any one of claims 1 to 14 disposed on the flexible screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910251307.1A CN111756889A (en) | 2019-03-29 | 2019-03-29 | Cover plate and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910251307.1A CN111756889A (en) | 2019-03-29 | 2019-03-29 | Cover plate and mobile terminal |
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| CN111756889A true CN111756889A (en) | 2020-10-09 |
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| CN201910251307.1A Pending CN111756889A (en) | 2019-03-29 | 2019-03-29 | Cover plate and mobile terminal |
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| CN113129747A (en) * | 2021-04-06 | 2021-07-16 | 武汉华星光电技术有限公司 | Packaging cover plate and display device |
| CN113870723A (en) * | 2021-11-26 | 2021-12-31 | 赛德半导体有限公司 | Bendable cover plate, preparation method, display panel and display device |
| CN114373391A (en) * | 2022-01-11 | 2022-04-19 | 武汉华星光电半导体显示技术有限公司 | Foldable display module |
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| CN114956591A (en) * | 2022-05-10 | 2022-08-30 | 四川江天科技有限公司 | Multi-connected-screen processing method, display screen and automobile |
| CN115550483A (en) * | 2022-03-14 | 2022-12-30 | 荣耀终端有限公司 | Folding terminal |
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