CN110718156A - Foldable display panel, manufacturing method and display device - Google Patents
Foldable display panel, manufacturing method and display device Download PDFInfo
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- CN110718156A CN110718156A CN201911051168.4A CN201911051168A CN110718156A CN 110718156 A CN110718156 A CN 110718156A CN 201911051168 A CN201911051168 A CN 201911051168A CN 110718156 A CN110718156 A CN 110718156A
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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
Abstract
The disclosure relates to a foldable display panel, a manufacturing method and a display device, and belongs to the technical field of displays. The foldable display panel comprises a cover plate, a display substrate and a conducting layer which are sequentially stacked. At least 2 conductive metal plates are arranged on the conductive layer at intervals, the conductive metal plates are bonded with the conductive layer, and 1 conductive metal plate is grounded. The foldable display panel further comprises a conductive structure, and each conductive metal plate is electrically connected with the conductive layer through the conductive structure. Arranging a conductive structure in the foldable display panel, electrically connecting the conductive metal plate and the conductive layer through the conductive structure, transmitting static electricity in the ungrounded conductive metal plate to the grounded conductive metal plate through the conductive structure and the conductive layer, and releasing the static electricity through the grounded conductive metal plate. Therefore, static electricity in the ungrounded conductive metal plate can be released, and the foldable display panel is prevented from being damaged by the static electricity.
Description
Technical Field
The disclosure relates to the technical field of displays, and in particular to a foldable display panel, a manufacturing method and a display device.
Background
In recent years, foldable or bendable display devices have become popular, in which a Bending (binding) region is provided between two rigid regions in a foldable or bendable display panel, and Bending is performed in the Bending region to realize a foldable or bendable function of the display panel.
The foldable display panel comprises a cover plate (English), a panel (English), a conductive layer and a steel plate which are sequentially designed in a laminated manner, and the conductive layer is connected with the steel plate through viscose glue. The steel plate comprises two parts which are arranged at intervals, the area provided with the steel plate is a rigid area of the display panel, and the area between the two parts of the steel plate is a bending area of the display panel.
A part of the steel plate in the rigid region is connected to a Flexible Circuit board (FPC), and the Flexible Circuit board is grounded and subjected to electrostatic discharge (ESD).
Disclosure of Invention
The embodiment of the disclosure provides a foldable display panel, a manufacturing method and a display device, which can solve the problem that static electricity of a steel plate which is not connected with a flexible circuit board in the foldable display panel in the related art can not be released. The technical scheme is as follows:
in a first aspect, an embodiment of the present disclosure provides a foldable display panel, where the foldable display panel includes a cover plate, a display substrate, and a conductive layer, which are sequentially stacked;
at least 2 conductive metal plates are arranged on the conductive layer at intervals, the conductive metal plates are bonded with the conductive layer, and 1 conductive metal plate is grounded;
the foldable display panel further comprises a conductive structure, and each conductive metal plate is electrically connected with the conductive layer through the conductive structure.
In one implementation manner of the embodiment of the present disclosure, the conductive metal plate and the conductive layer are bonded by an adhesive layer, the conductive structure is a conductive block, and the conductive block has two opposite surfaces and a sidewall connecting the two surfaces;
the interval is provided with 2 at least conductive blocks in gluing the layer, the lateral wall of conductive block with glue the layer and be connected, every conductive block with 1 at least conductive metal plate corresponds the setting, just the relative two sides that set up of conductive block respectively with conductive metal plate with the conducting layer electricity is connected.
In one implementation manner of the embodiment of the present disclosure, the conductive metal plate and the conductive layer are bonded by an adhesive layer, and the conductive structure is a conductive rod;
every the through-hole has been seted up on the electrically conductive metal sheet, the through-hole passes in proper order the electrically conductive metal sheet with glue glutinous layer, every all be provided with in the through-hole the conducting rod, just the both ends of conducting rod respectively with the electrically conductive metal sheet with the conducting layer electricity is connected.
In one implementation of the embodiment of the present disclosure, the conductive rod is a bolt, and the bolt is welded to the conductive layer.
In one implementation of the disclosed embodiment, the conductive structure includes at least one of a conductive paste structure and a metal material structure.
In a second aspect, an embodiment of the present disclosure provides a method for manufacturing a foldable display panel, where the method for manufacturing a foldable display panel includes:
providing a display substrate;
sequentially forming a conductive layer and at least 2 conductive metal plates on one surface of the display substrate, wherein the conductive metal plates are bonded with the conductive layer, and 1 conductive metal plate is grounded; each conductive metal plate is electrically connected with the conductive layer through a conductive structure;
and a cover plate is arranged on the other surface of the display substrate.
In one implementation manner of the embodiment of the present disclosure, the conductive structure is a conductive block, and the conductive block has two opposite surfaces and a sidewall connecting the two surfaces; form conducting layer and at least 2 electrically conductive metal sheets in proper order on one side of display substrate, include:
manufacturing the conductive layer on the display substrate;
manufacturing an adhesive layer and the at least 2 conductive blocks on the conductive layer, wherein the side walls of the conductive blocks are connected with the adhesive layer;
the adhesive layer is provided with at least 2 conductive metal plates, each conductive block is arranged corresponding to at least 1 conductive metal plate, and two opposite surfaces of each conductive block are respectively electrically connected with the conductive metal plates and the conductive layers.
In one implementation manner of the embodiment of the present disclosure, the adhesive layer includes a non-conductive adhesive, and the conductive block is a conductive adhesive;
the preparation glues sticky layer and 2 piece at least conductive blocks on the conducting layer includes:
coating the conductive adhesive and the non-conductive adhesive on the conductive layer by two coating devices respectively; drying the coated conductive adhesive and the non-conductive adhesive by using a drying preparation;
or, the manufacturing of the non-conductive adhesive and at least 2 conductive blocks on the conductive layer includes:
applying the conductive paste and the non-conductive paste on the conductive layer in a time-sharing manner using a coating device; and drying the coated conductive adhesive and the non-conductive adhesive by using a drying preparation.
In one implementation of the disclosed embodiment, the conductive structure is a conductive rod; form conducting layer and at least 2 electrically conductive metal sheets in proper order on one side of display substrate, include:
manufacturing the conductive layer on the display substrate;
manufacturing an adhesive layer on the conductive layer;
manufacturing the at least 2 conductive metal plates on the adhesive layer;
each conductive metal plate is provided with a through hole, and the through holes sequentially penetrate through the conductive metal plates and the adhesive layers;
and manufacturing the conductive rod in each through hole, wherein two ends of the conductive rod are respectively electrically connected with the conductive metal plate and the conductive layer.
In a third aspect, embodiments of the present disclosure provide a display device comprising the foldable display panel of any one of the first aspect.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
at least 2 conductive metal plates are arranged on the conductive layer at intervals, a rigid area of the foldable display panel is formed in an area provided with the conductive metal plates, and an area between every two adjacent 2 conductive metal plates is a bending area, so that the foldable or bendable function of the foldable display panel is realized. Arranging a conductive structure in the foldable display panel, electrically connecting the conductive metal plate and the conductive layer through the conductive structure, transmitting static electricity in the ungrounded conductive metal plate to the grounded conductive metal plate through the conductive structure and the conductive layer, and releasing the static electricity through the grounded conductive metal plate. Therefore, static electricity in the ungrounded conductive metal plate can be released, and the foldable display panel is prevented from being damaged by the static electricity.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure;
fig. 2 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure;
fig. 3 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure;
fig. 4 is a top view of a foldable display panel provided by an embodiment of the present disclosure;
fig. 5 is a block diagram of a foldable display panel provided in an embodiment of the present disclosure;
fig. 6 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure;
fig. 7 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure;
fig. 8 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure;
fig. 9 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure;
fig. 10 is a top view of a foldable display panel provided by an embodiment of the present disclosure;
fig. 11 is a top view of a foldable display panel provided by an embodiment of the present disclosure;
fig. 12 is a flowchart of a method for manufacturing a foldable display panel according to an embodiment of the present disclosure;
13-17 are schematic diagrams of a foldable display panel according to an embodiment of the disclosure;
FIG. 18 is a schematic structural diagram of a method for manufacturing a non-conductive adhesive and a conductive adhesive according to an embodiment of the disclosure;
fig. 19-22 are schematic diagrams illustrating a foldable display panel according to an embodiment of the disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
At present, the flexible display technology based on the Low Temperature Polysilicon (LTPS) technology provides the possibility for foldable or bendable display panels. However, in the process of repeated folding or bending, the conductive metal plate is dislocated due to the existence of mechanical stress, so that the display of the display panel is poor, and the conductive metal plate is connected with the conductive layer through the adhesive layer in order to ensure that the conductive metal plate is not dislocated. However, the adhesion layer is not conductive, which results in the separation of the conductive metal plates, so that static electricity in the ungrounded conductive metal plates cannot be discharged, and inevitably causes damage to the display panel, resulting in problems such as poor screen, poor line, abnormal display, etc.
Fig. 1 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure. Referring to fig. 1, the foldable display panel includes a cover plate 10, a display substrate 20, and a conductive layer 30, which are sequentially stacked. At least 2 conductive metal plates 40 are arranged on the conductive layer 30 at intervals, the conductive metal plates 40 are adhered to the conductive layer 30, and 1 conductive metal plate 40 is grounded. The foldable display panel further comprises a conductive structure 70, and each conductive metal plate 40 is electrically connected to the conductive layer 30 through the conductive structure 70.
In the embodiment of the present disclosure, at least 2 conductive metal plates 40 are arranged on the conductive layer 30 at intervals, a rigid region of the foldable display panel is formed in a region where the conductive metal plates 40 are arranged, and a bending region 80 is formed in a region between two adjacent conductive metal plates 40, so as to implement a foldable or bendable function of the foldable display panel. The conductive structure 70 is disposed in the foldable display panel, the conductive metal plate 40 and the conductive layer 30 are electrically connected through the conductive structure 70, static electricity in the ungrounded conductive metal plate 40 is transmitted to the grounded conductive metal plate 40 through the conductive structure 70 and the conductive layer 30, and the static electricity is discharged through the grounded conductive metal plate. Thus, the static electricity in the ungrounded conductive metal plate 40 can be released, and the foldable display panel is prevented from being damaged by the static electricity. The scheme provided by the disclosure is suitable for folding screens of various sizes.
The conductive metal plate 40 is bonded to the conductive layer 30 through an adhesive layer 50. The 1 conductive metal plate 40 is electrically connected to the circuit board 60, and the circuit board 60 is grounded.
As shown in fig. 1, the arrows in fig. 1 indicate electrostatic transmission paths in the conductive metal plate 40 that is not electrically connected to the circuit board 60. Taking 1 conductive metal plate 40 as an example, the static electricity in the conductive metal plate 40 is firstly transmitted to the conductive structure 70, then transmitted to the conductive layer 30, then transmitted to the conductive structure 70, then transmitted to the conductive metal plate 40 electrically connected to the circuit board 60, and finally released through the circuit board 60. The number of the conductive metal plates 40 and the number of the conductive structures 70 in fig. 1 are only examples, in other examples, the number of the conductive metal plates 40 may be greater than 2, and each conductive metal plate 40 may also be electrically connected to the conductive layer 30 through 2 or more conductive structures 70. The width of the bending region 80 in fig. 1 is also only an example, and can be determined according to practical needs, and the disclosure does not limit this.
In the embodiment of the present disclosure, the cover plate 10 is a transparent protective layer on the surface of the foldable display panel, and mainly functions to protect the internal structure of the foldable display panel, and the cover plate 10 may be a transparent plastic with soft texture to ensure flexibility.
The display substrate 20 is exemplarily used for displaying a picture, and may be, for example, a flexible OLED display substrate.
Illustratively, the conductive layer 30 may be a Stainless Steel (abbreviated as SUS) layer or a copper layer. The stainless steel and the copper have conductivity, can transmit electric charges, and can be bent, so that the conductive layer 30 can be bent at the corresponding position of the bending area 80. The stainless steel and the copper have certain support performance, and can play a certain supporting role on the cover plate 10 and the display substrate 20, so that the screen shape of the foldable display panel is ensured. Meanwhile, stainless steel and copper have good heat dissipation performance and can also be used as a heat dissipation layer. For example, the stainless steel layer may be an SUS304 layer, i.e., a 304 stainless steel layer, and the 304 stainless steel has good heat resistance, so as to prevent the foldable display panel from being overheated and damaged.
Illustratively, the conductive metal plate 40 may be a steel plate. The conductive metal plate 40 is used for supporting and shaping, and the conductive metal plate 40 is only arranged in the rigid area and is not arranged in the bending area 80. When the bending region 80 is bent, the cover plate 10, the display substrate 20 and the conductive layer 30 are bent at a position corresponding to the bending region 80, and in order to ensure that the cover plate 10, the display substrate 20 and the conductive layer 30 can be bent, the cover plate 10, the display substrate 20 and the conductive layer 30 need to have certain flexibility, which inevitably causes insufficient rigidity of the cover plate 10, the display substrate 20 and the conductive layer 30 and insufficient supporting force of the foldable display panel, and the conductive metal plate 40 can support the cover plate 10, the display substrate 20 and the conductive layer 30 in a region outside the bending region 80, thereby ensuring the supporting force of the foldable display panel. The strength of the steel plate is high, and the supporting force of the foldable display panel is guaranteed. The conductive metal plate 40 may also be called a rack (english) structure because the conductive metal plate 40 has a supporting function.
Illustratively, the adhesive layer 50 may include a non-conductive adhesive. The adhesive layer 50 is used to adhere the conductive metal plate 40 and the conductive layer 30, and fix the conductive metal plate 40 on the display substrate 20.
Illustratively, the non-conductive glue may be an Embo glue or an OCA glue. The OCA (optical clear adhesive tape) is a double-sided adhesive tape without a base material, has the light transmittance of more than 90 percent, good bonding strength, capability of being cured at room temperature or middle temperature, small curing shrinkage and the like. Embo adhesive is a black mesh adhesive material, and the mesh structure has the functions of removing bubbles, shading light and adhering. The Embo glue or OCA glue is not conductive and cannot transmit static electricity. The strong adhesiveness of the Embo glue or the OCA glue ensures that the conductive metal plate 40 can be adhered to the conductive layer 30, and avoids the displacement of the conductive metal plate 40 in the folding or bending process.
As shown in fig. 1, the partial conductive structure 70 disposed only in the adhesion layer 50 does not affect adhesion between the conductive metal plate 40 and the conductive layer 30, so as to ensure that the conductive metal plate 40 can be adhered to the conductive layer 30, thereby preventing stress from being generated between the conductive metal plate 40 and the conductive layer 30 during bending, and preventing poor functionality (such as poor line, abnormal display, black spot, etc.) from occurring, and preventing the conductive metal plate 40 from shifting to cause a Crack (english: Crack) to be generated by pulling the circuit board 60, thereby damaging the circuit board 60.
For example, the circuit board 60 may be a Chip On Film (COF) circuit board, and the COF circuit board may be flexible and easily connected to the display substrate 20. The circuit board 60 is used to transmit electrical signals and is capable of transferring signals between an Integrated Circuit (IC) of the foldable screen and the foldable display panel.
As shown in fig. 1, the foldable display panel may further include a flexible circuit board 90, the flexible circuit board 90 being connected between the COF circuit board and the IC. The Flexible circuit board 90 may be a multi-layer Flexible circuit board (M-Flexible printed circuit) in english. The multilayer flexible circuit board is formed by laminating 3 or more layers of single-sided or double-sided flexible circuits together, forming metallized holes by electroplating and the like, and forming conductive paths among different layers, so that a complex welding process is not needed. The multilayer flexible circuit board has better reliability and thermal conductivity.
Fig. 2 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure. Referring to fig. 2, the foldable display panel may further include a touch layer 100, and the touch layer 100 is located between the cover plate 10 and the display substrate 20.
The touch layer 100 is mainly used to detect a touch operation, and transmit a signal of the touch operation of the user to a processing unit in the display, so as to implement a touch function of the display.
As shown in fig. 2, the circuit board 60 can be connected to the display substrate 20 and the touch layer 100 at the same time, so as to achieve driving in both display and touch aspects.
For example, a Touch Sensor (english: Touch Sensor) may be disposed in the Touch layer 100 to implement a Touch function. The foldable display panel further includes a Polarizer (not shown) between the touch layer 100 and the cover plate 10. The polarizer and the touch sensor form a PST module.
Fig. 3 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure. Referring to fig. 3, fig. 3 is different from fig. 2 in that touch and display respectively employ circuit driving. As shown in fig. 3, the display substrate 20 is driven by the COF circuit board 60 and the flexible circuit board 90 on the right side, and the touch layer 100 is driven by the COF circuit board 120 and the flexible circuit board 110 on the left side. By the design, the touch operation signal and the display signal are transmitted separately, and interference is avoided. It should be noted here that the circuit board for driving the touch is not grounded and does not have the function of conducting static electricity.
Fig. 4 is a top view of a foldable display panel provided by an embodiment of the present disclosure. Referring to fig. 4, the conductive structure 70 is disposed along the length direction a of the conductive metal plate 40, and the length of the conductive structure 70 is equal to the length of the conductive metal plate 40, so that the design ensures that the volume of the conductive structure 70 is large enough, the contact area between the conductive structure 70 and the conductive layer is large enough, and the conductive structure 70 and the conductive layer are prevented from being in poor contact and unable to transmit static electricity.
In other embodiments, the conductive structure 70 may be disposed along other directions, so as to ensure that the conductive metal plate 40 can be electrically connected to the conductive layer 30 through the conductive structure 70.
In one implementation of the disclosed embodiment, the conductive structure 70 may include at least one of a conductive paste structure and a metal material structure.
The conductive adhesive has adhesiveness, and can adhere the conductive metal plate 40 to the conductive layer 30. Meanwhile, both the conductive adhesive and the metal material have conductivity and can transmit static electricity.
For example, the conductive adhesive may be silver-based, gold-based, copper-based, carbon-based, or other conductive adhesives as appropriate according to the actual situation. The metal material can be copper, iron and other metal materials.
Fig. 5 is a structural diagram of a foldable display panel provided in an embodiment of the present disclosure. Referring to fig. 5, the conductive structure is a conductive block 701, and the conductive block 701 has two opposite surfaces and a sidewall connecting the two surfaces. At least 2 conductive blocks 701 are arranged in the adhesive layer 50 at intervals, the side walls of the conductive blocks 701 are connected with the adhesive layer 50, each conductive block 701 corresponds to at least 1 conductive metal plate 40, and two opposite surfaces of each conductive block 701 are respectively electrically connected with the conductive metal plates 40 and the conductive layers 30.
The conductive bumps 701 in the adhesive layer 50 are used to transfer charges. Since the grounded conductive metal plate 40 and the conductive layer 30 are also separated from each other, it is necessary to discharge static electricity in the conductive metal plate 40 which is not grounded unless each 1 conductive metal plate 40 is electrically connected to the conductive layer 30 through the conductive block 701.
As shown in fig. 5, the conductive block 701 is located in the adhesion layer 50, and the non-conductive adhesive of the adhesion layer 50 wraps the conductive block 701, so as to ensure that the conductive block 701 can electrically connect the conductive metal plate 40 and the conductive layer 30, and can ensure the integrity of the conductive metal plate 40 and the conductive layer 30.
Illustratively, the conductive block 701 may be the conductive paste structure described above.
Fig. 6 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure. Referring to fig. 6, the conductive structure 70 is a conductive rod 702, each conductive metal plate 40 is provided with a through hole 401, the through hole 401 sequentially penetrates through the conductive metal plate 40 and the adhesive layer 50, the conductive rod 702 is disposed in each through hole 401, and two ends of the conductive rod 702 are electrically connected to the conductive metal plate 40 and the conductive layer 30 respectively.
In this implementation, the conductive rod 702 penetrates the conductive metal plate 40 and the adhesive layer 50 through the through hole 401 and contacts the conductive layer 30, and the function of discharging static electricity in the conductive metal plate 40 can also be achieved.
As shown in fig. 6, one of the conductive rods 702 contacts with the interface between the conductive layer 30 and the adhesive layer 50 (i.e. the conductive rod 702 on the right side in fig. 6), so that the conductive rod 702 can be electrically connected to the conductive layer 30, and meanwhile, no accommodating groove for accommodating the conductive rod 702 is required to be formed on the conductive layer 30, which is convenient for manufacturing.
As shown in fig. 6, the conductive layer 30 is provided with an accommodating groove for accommodating the conductive rod 702, a part of the conductive rod 702 is located in the accommodating groove (i.e. the left conductive rod 702 in fig. 6), and the conductive rod 702 penetrates through a part of the conductive layer 30, so that the area of the contact part between the conductive rod 702 and the conductive layer 30 is large enough, and the static electricity cannot be effectively transmitted due to poor contact is avoided.
The conductive rods 702 shown in fig. 6 are only examples, and in other implementations, the number of the conductive rods 702 corresponding to each 1 conductive metal plate 40 may be 2 or more.
As shown in fig. 6, the left conductive rod 702 only extends through a portion of the conductive layer 30. In other implementations, the conductive rod 702 may extend through the entire conductive layer 30, which is not limited by the present disclosure.
For example, the conductive rod 702 may be the conductive paste structure, or may be a metal material structure.
Fig. 7 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure. Referring to fig. 7, the conductive rod 702 may be a metal material structure, such as a bolt, which is welded to the conductive layer 30.
In the foldable display device, the main board needs to be fixed by the conductive metal plate 40, the conductive rod 702 is set as a bolt, and one end of the bolt extends out of the conductive metal plate 40 to be matched with the main board, so that the main board can be fixed by the bolt. The bolt penetrates through the conductive metal plate 40 and the adhesive layer 50, and is welded with the conductive layer 30, so that the stability of the bolt is guaranteed.
Illustratively, the welding manner may be electric welding.
Fig. 8 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure. Referring to fig. 8, the conductive layer 30 is provided with a receiving groove for receiving a bolt, and a part of the bolt is located in the receiving groove, that is, the bolt penetrates through a part of the conductive layer 30, so that the design ensures that the area of the part of the bolt in contact with the conductive layer 30 is large enough, and the problem that static electricity cannot be effectively transmitted due to poor contact is avoided.
In other implementations, other placement arrangements of bolts may be used. For example, the bolts are threaded through the entire conductive layer 30, which is not limited by the present disclosure.
Illustratively, the bolts may be provided in different shapes as desired.
Fig. 9 is a cross-sectional view of a foldable display panel provided by an embodiment of the present disclosure. Referring to fig. 9, the shape of the bolt is different from that shown in fig. 7 and 8. The end of the bolt shown in fig. 9, which is in contact with the conductive layer 30, is provided with a tip, and the welding area of the bolt and the conductive layer 30 is small, so that the stamping generated at the contact position of the bolt and the conductive layer 30 is small.
To ensure the stability of the bolt, the bolt is generally fixed on the conductive layer 30 by welding, and during the welding process, the bolt may leave a mold on the conductive layer 30 when contacting the conductive layer 30 due to heat. The bolt is arranged to be of a structure with a pointed end at one end, so that the contact area of the bolt and the conducting layer 30 is small, the conducting layer 30 is small in deformation caused by heating, and a die mark is prevented from being left on the conducting layer 30.
The conductive structures 70 may be arranged in any one of the above manners or a combination of several manners, which is not limited by the present disclosure.
Fig. 10 is a top view of a foldable display panel provided by an embodiment of the present disclosure. Referring to fig. 10, when the conductive structure 70 of the aforementioned conductive rod type is used, the cross-section of the conductive rod may be circular or diamond-shaped.
Illustratively, the conductive structure 70 may be provided in other shapes, for example, the cross-section of the conductive structure 70 may be oval, triangular, polygonal, or other irregular shapes.
Fig. 11 is a top view of a foldable display panel provided by an embodiment of the present disclosure. Referring to fig. 11, there may be a plurality of conductive structures 70 electrically connected to 1 conductive metal plate 40, and each conductive structure 70 has a small volume and is electrically connected to the conductive metal plate 40. The conductive structure 70 shown in fig. 11 is more uniformly arranged than the conductive structure 70 shown in fig. 4 and 10, and the conductive structure 70 shown in fig. 11 ensures that the conductive metal plate 40 is more uniformly electrically connected with the conductive layer.
As shown in fig. 11, unlike the arrangement of the conductive structures 70 electrically connected to the 2 conductive metal plates 40, in other implementations, the arrangement of the conductive structures 70 electrically connected to the conductive metal plates 40 may be the same, or may be a combination of various ways.
As shown in fig. 11, the conductive structure 70 electrically connected to the conductive metal plate 40 is disposed along the periphery of the conductive metal plate 40, and in other implementations, the conductive structure 70 may be disposed in the middle.
Illustratively, the shape of the conductive structure 70 may be set as the case may be.
Illustratively, when the conductive structure 70 is arranged as a bolt, the bolt may be arranged in the manner shown in fig. 11, the bolt needs to be fixed on the conductive layer 30 by welding, and the volume of the bolt is set to be small, so as to avoid the bolt leaving a die mark on the conductive layer 30.
The embodiment of the disclosure further provides a method for manufacturing a foldable display panel, and fig. 12 is a flowchart of the method for manufacturing a foldable display panel provided by the embodiment of the disclosure, and is used for manufacturing the foldable display panel shown in any one of the above figures. Referring to fig. 12, the method for manufacturing the foldable display panel includes:
step 1201: a display substrate is provided.
The display substrate may be an OLED display substrate. Referring to fig. 13, a display substrate 20 is provided.
Step 1202: sequentially forming a conductive layer and at least 2 conductive metal plates on one surface of the display substrate, wherein the conductive metal plates are bonded with the conductive layer, and 1 conductive metal plate is grounded; each conductive metal plate is electrically connected with the conductive layer through the conductive structure.
Referring to fig. 14, a conductive layer 30 and at least 2 conductive metal plates 40 are formed on one side of a display substrate 20. The conductive metal plate 40 is directly mounted on the conductive layer 30. Of which 1 conductive metal plate 40 is grounded and each conductive metal plate 40 is electrically connected to the conductive layer 30 through the conductive structure 70.
Illustratively, the conductive layer 30 and the conductive metal plate 40 may be adhered by an adhesive layer 50. The 1 conductive metal plate 40 is electrically connected to the circuit board 60, and the circuit board 60 is grounded.
Step 1203: a cover plate is mounted on the other surface of the display substrate.
The foldable display panel shown in fig. 1 can be obtained by mounting the cover plate 10 on the other side of the display substrate 20.
Optionally, the conductive structure is a conductive block having two oppositely disposed faces and a sidewall connecting the two faces. Sequentially forming a conductive layer and at least 2 conductive metal plates on one side of a display substrate may include:
and manufacturing a conductive layer on the display substrate.
Referring to fig. 15, a conductive layer 30 is formed on the display substrate 20, and the conductive layer 30 may be fixed on the display substrate 20 by adhesion. The conductive layer 30 is a metal layer and can be formed on the display substrate 20 by sputtering or the like.
And manufacturing an adhesive layer and at least 2 conductive blocks on the conductive layer, wherein the side walls of the conductive blocks are connected with the adhesive layer.
Referring to fig. 16, a non-conductive paste and at least 2 conductive bumps 701 are formed on the conductive layer 30, resulting in an adhesive layer 50. The non-conductive adhesive and the conductive block 701 are simultaneously formed on the conductive layer 30 for convenient manufacturing.
At least 2 conductive metal plates are manufactured on the adhesive layer, each conductive block corresponds to at least 1 conductive metal plate, and two oppositely arranged surfaces of each conductive block are respectively electrically connected with the conductive metal plates and the conductive layers.
Referring to fig. 17, a conductive metal plate 40 is formed on the adhesive layer 50, and the conductive metal plate 40 and the conductive layer 30 are electrically connected by a conductive block 701. Each conductive block 701 is disposed corresponding to at least 1 conductive metal plate 40, and two opposite surfaces of the conductive block 701 are electrically connected to the conductive metal plate 40 and the conductive layer 30, respectively.
Optionally, glue the glutinous layer and include non-conductive glue, the conducting block is the conducting resin, makes on the conducting layer and glues glutinous layer and 2 at least conducting blocks, includes:
respectively coating conductive adhesive and non-conductive adhesive on the conductive layer by two coating devices;
and drying the coated conductive adhesive and non-conductive adhesive by adopting a drying preparation method.
Or, make sticky layer and at least 2 conductive blocks on the conducting layer, including:
coating conductive adhesive and non-conductive adhesive on the conductive layer by time division by using a coating device;
and drying the coated conductive adhesive and non-conductive adhesive by adopting a drying preparation method.
Fig. 18 is a schematic structural diagram of manufacturing a non-conductive adhesive and a conductive adhesive according to an embodiment of the disclosure. Referring to fig. 18, two coating devices 130 are spaced apart from each other on the conductive layer, and the fabrication of the non-conductive adhesive and the conductive adhesive is achieved by controlling the operation timing of the two coating devices 130.
For example, two coating devices 130 are used to simultaneously coat conductive and non-conductive pastes on the conductive layer, respectively. The two coating devices 130 are filled with the non-conductive adhesive and the conductive adhesive, respectively, and the two coating devices 130 are opened at the same time, and when the foldable display panel is rolled on the rolling device 140, the two coating devices 130 are operated at the same time, thereby simultaneously coating the conductive adhesive and the non-conductive adhesive on the conductive layer.
For example, conductive and non-conductive pastes are time-divisionally applied over the conductive layer. Only one coating device 130 may be arranged, the non-conductive paste is first placed on the coating device 130, the coating device 130 is opened, and the non-conductive paste is coated by the coating device 130 when the foldable display panel is rolled on the rolling device 140. Gaps coated with the conductive adhesive are left between the non-conductive adhesives. When the application of the non-conductive paste is completed, the conductive paste is placed in the application device 130, and the conductive paste is applied in the gaps of the non-conductive paste. Of course, the conductive adhesive may be first formed and then the non-conductive adhesive may be formed.
In other implementations, two coating devices 130 may be arranged to contain the non-conductive adhesive and the conductive adhesive, respectively, and the two coating devices 130 operate in a time-sharing manner, wherein after the operation of one coating device 130 is completed, the other coating device 130 is turned on, so that the conductive adhesive and the non-conductive adhesive are coated on the conductive layer in a time-sharing manner.
As shown in fig. 18, a drying device 150 is disposed when the non-conductive adhesive and the conductive adhesive are manufactured, and the drying device 150 is used for drying the coated conductive adhesive and the non-conductive adhesive to accelerate curing of the non-conductive adhesive and the conductive adhesive.
Optionally, the conductive structure is a conductive rod; forming a conductive layer and at least 2 conductive metal plates in sequence on one side of a display substrate, comprising:
and manufacturing a conductive layer on the display substrate.
Referring to fig. 15, a conductive layer 30 is fabricated on the display substrate 20.
And manufacturing an adhesive layer on the conductive layer.
Referring to fig. 19, a non-conductive paste is formed on the conductive layer 30 to obtain an adhesive layer 50.
At least 2 conductive metal plates are manufactured on the adhesive layer.
Referring to fig. 20, at least 2 conductive metal plates 40 are fabricated on the adhesive layer 50.
Each conductive metal plate is provided with a through hole, and the through holes sequentially penetrate through the conductive metal plates and the adhesive layers.
Referring to fig. 21, each conductive metal plate 40 is provided with a through hole 401, and the through hole 401 sequentially penetrates through the conductive metal plate 40 and the adhesive layer 50. Here, the through-hole 401 may be formed by laser drilling.
And manufacturing a conductive rod in each through hole, wherein two ends of the conductive rod are respectively and electrically connected with the conductive metal plate and the conductive layer.
Referring to fig. 22, a conductive rod 702 is formed in each through hole 401, and both ends of the conductive rod 702 are electrically connected to the conductive metal plate 40 and the conductive layer 30, respectively.
As shown in fig. 22, the conductive rod 702 may be a screw fixed on the conductive layer 30 by welding. In other implementations, the conductive rod 702 may be a conductive paste structure, and a rod-shaped structure is formed by filling the through hole 401 with a conductive paste.
In addition, the depth and the shape of the through hole 401 provided in the embodiments of the present disclosure may be designed according to actual needs, and refer to the related description above specifically. Likewise, the shape of the conductive rod 702 can be designed according to the requirement, and is not limited to this.
The present disclosure also provides a display device comprising a foldable display panel as shown in any of the above figures.
In specific implementation, the display device provided in the embodiments of the present disclosure may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A foldable display panel, characterized in that the foldable display panel comprises a cover plate (10), a display substrate (20) and a conductive layer (30) which are arranged in sequence in a stacked manner;
at least 2 conductive metal plates (40) are arranged on the conductive layer (30) at intervals, the conductive metal plates (40) are bonded with the conductive layer (30), and 1 conductive metal plate (40) is grounded;
the foldable display panel further comprises a conductive structure (70), and each conductive metal plate (40) is electrically connected with the conductive layer (30) through the conductive structure (70).
2. The foldable display panel according to claim 1, wherein the conductive metal plate (40) and the conductive layer (30) are bonded by an adhesive layer (50), the conductive structure (70) is a conductive block (701), and the conductive block (701) has two opposite sides and a sidewall connecting the two sides;
glue and be provided with 2 at least conductive block (701) in the interval in gluing layer (50), the lateral wall of conductive block (701) with glue and glue layer (50) and connect, every conductive block (701) and 1 at least conductive metal plate (40) correspond the setting, just the relative two sides that set up of conductive block (701) respectively with conductive metal plate (40) with conducting layer (30) electricity is connected.
3. The foldable display panel according to claim 1, wherein the conductive metal plate (40) and the conductive layer (30) are bonded by an adhesive layer (50), and the conductive structure (70) is a conductive rod (702);
every through-hole (401) have been seted up on electrically conductive metal sheet (40), through-hole (401) pass in proper order electrically conductive metal sheet (40) with glue layer (50), every all be provided with in through-hole (401) conducting rod (702), just the both ends of conducting rod (702) respectively with electrically conductive metal sheet (40) with conducting layer (30) electricity is connected.
4. The foldable display panel of claim 3, wherein the conductive rod (702) is a bolt welded with the conductive layer (30).
5. The foldable display panel according to any of claims 1 to 4, wherein the conductive structure (70) comprises at least one of a conductive glue structure and a metal material structure.
6. A method for manufacturing a foldable display panel is characterized by comprising the following steps:
providing a display substrate;
sequentially forming a conductive layer and at least 2 conductive metal plates on one surface of the display substrate, wherein the conductive metal plates are bonded with the conductive layer, and 1 conductive metal plate is grounded; each conductive metal plate is electrically connected with the conductive layer through a conductive structure;
and a cover plate is arranged on the other surface of the display substrate.
7. The method of claim 6, wherein the conductive structure is a conductive block having two opposite sides and a sidewall connecting the two sides; form conducting layer and at least 2 electrically conductive metal sheets in proper order on one side of display substrate, include:
manufacturing the conductive layer on the display substrate;
manufacturing an adhesive layer and the at least 2 conductive blocks on the conductive layer, wherein the side walls of the conductive blocks are connected with the adhesive layer;
the adhesive layer is provided with at least 2 conductive metal plates, each conductive block is arranged corresponding to at least 1 conductive metal plate, and two opposite surfaces of each conductive block are respectively electrically connected with the conductive metal plates and the conductive layers.
8. The method for manufacturing the foldable display panel according to claim 7, wherein the adhesive layer comprises a non-conductive adhesive, and the conductive blocks are conductive adhesives;
the preparation glues sticky layer and 2 piece at least conductive blocks on the conducting layer includes:
coating the conductive adhesive and the non-conductive adhesive on the conductive layer by two coating devices respectively; drying the coated conductive adhesive and the non-conductive adhesive by using a drying preparation;
or, the manufacturing of the non-conductive adhesive and at least 2 conductive blocks on the conductive layer includes:
applying the conductive paste and the non-conductive paste on the conductive layer in a time-sharing manner using a coating device; and drying the coated conductive adhesive and the non-conductive adhesive by using a drying preparation.
9. The method of claim 6, wherein the conductive structure is a conductive rod; form conducting layer and at least 2 electrically conductive metal sheets in proper order on one side of display substrate, include:
manufacturing the conductive layer on the display substrate;
manufacturing an adhesive layer on the conductive layer;
manufacturing the at least 2 conductive metal plates on the adhesive layer;
each conductive metal plate is provided with a through hole, and the through holes sequentially penetrate through the conductive metal plates and the adhesive layers;
and manufacturing the conductive rod in each through hole, wherein two ends of the conductive rod are respectively electrically connected with the conductive metal plate and the conductive layer.
10. A display device comprising the foldable display panel of any one of claims 1 to 5.
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| CN201911051168.4A CN110718156B (en) | 2019-10-31 | 2019-10-31 | Foldable display panel, manufacturing method and display device |
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