CN111415591A - Display panel, manufacturing method thereof and display device - Google Patents
Display panel, manufacturing method thereof and display device Download PDFInfo
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- CN111415591A CN111415591A CN202010356960.7A CN202010356960A CN111415591A CN 111415591 A CN111415591 A CN 111415591A CN 202010356960 A CN202010356960 A CN 202010356960A CN 111415591 A CN111415591 A CN 111415591A
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- display
- display panel
- display substrate
- circuit board
- flexible circuit
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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 invention provides a display panel, a manufacturing method thereof and a display device, wherein the display panel comprises a display substrate, the display substrate comprises a bending part and a binding part adjacent to the bending part, the display substrate further comprises a flexible circuit board bound with the binding part, and a protective layer positioned on one side of the display substrate far away from the flexible circuit board, the protective layer comprises a target part which is opposite to the flexible circuit board and is staggered with the display substrate, the target part is provided with a drainage cavity, and organic insulating glue is accommodated in the drainage cavity. The display panel, the manufacturing method thereof and the display device provided by the invention can ensure the display quality of the display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a manufacturing method of the display panel and a display device.
Background
With the development trend of full-screen, in order to narrow the frame of the display device, the narrow frame design of the flexible display panel is generally realized by using the Pad bonding technology; specifically, a bending region is designed between a Bonding region and a display region of the display panel, and the bending region of the display panel is bent toward the back side of the display panel, so that the Bonding region is located at the back side of the display panel, thereby reducing the bezel width.
Among them, the Pad bonding technology requires a back Film removing process, but the display device in the related art, which removes a back Film by using a U-Film process, has a problem that pins of a Main Flexible Printed Circuit (MFPC) are corroded by moisture, causing display abnormality.
Disclosure of Invention
The embodiment of the invention provides a display panel, a manufacturing method thereof and a display device, and aims to solve the problem that in the display device for removing a back Film by using a U-Film process in the related art, a pin of a main flexible circuit board is corroded by water vapor, so that abnormal display is caused.
In order to solve the above technical problems, the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides a display panel, including a display substrate, where the display substrate includes a bending portion and a binding portion adjacent to the bending portion, and is characterized by further including a flexible circuit board bound to the binding portion, and a protective layer located on a side of the display substrate away from the flexible circuit board, where the protective layer includes a target portion facing the flexible circuit board and dislocated from the display substrate, the target portion is provided with a drainage cavity, and an organic insulating adhesive is contained in the drainage cavity.
Further, at least part of the drainage cavity is arranged opposite to the pins of the flexible circuit board.
Furthermore, one end of the target part, which is far away from the bent part, is provided with an opening, and the opening is communicated with the drainage cavity.
Furthermore, the protective layer further comprises a folding part, the folding part is provided with a through hole penetrating through the protective layer, and the orthographic projection of the folding part on the display substrate is superposed with the bending part.
Furthermore, the through hole is long-strip-shaped, and the length direction of the through hole is perpendicular to the bending direction of the display panel.
Further, the protective layer includes an adhesive layer and a resin layer, the adhesive layer being located between the resin layer and the display substrate.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel described above.
In a third aspect, an embodiment of the present invention further provides a method for manufacturing a display panel, where the method is applied to the display panel, and the method includes:
manufacturing a protective layer on a display substrate, wherein the protective layer comprises a target part which is staggered with the display substrate;
a drainage cavity is formed in the target part;
binding a flexible circuit board with a binding part of the display substrate, wherein the flexible circuit board is arranged opposite to the target part;
an organic insulating paste is applied between the flexible circuit board and the target portion.
Further, after the protective layer is formed on the display substrate, the method further includes:
and arranging a through hole penetrating through the protective layer at the folding part of the protective layer, wherein the orthographic projection of the folding part on the display substrate is superposed with the bending part.
Further, the manufacturing of the protective layer on the display substrate includes:
forming an adhesive layer on the display substrate;
and forming a resin layer on the adhesive layer.
According to the technical scheme provided by the invention, a gap exists between the target part of the protective layer and the flexible circuit board, and the drainage cavity and the gap can be filled with the coated organic insulating glue along the drainage cavity by arranging the drainage cavity in the target part, so that under the condition that the gap is pulled open due to the bending of the subsequent display panel, enough organic insulating glue can be arranged in the gap to protect the pins of the flexible circuit board, the exposure of the pins of the flexible circuit board is avoided, the pins of the flexible circuit board are prevented from being corroded by water vapor, and the display quality of the display device is ensured. Therefore, the technical scheme provided by the invention can avoid the exposure of the pins of the flexible circuit board, thereby preventing the pins of the flexible circuit board from being corroded by water vapor and ensuring the display quality of the display device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is an enlarged view of area A of FIG. 1;
FIG. 3 is a schematic diagram of a display panel according to the related art;
fig. 4 is a schematic structural diagram of a display panel according to another embodiment of the present invention;
FIG. 5 is a top view of a through hole in a display panel according to another embodiment of the present invention;
fig. 6 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a display panel, as shown in fig. 1 and fig. 2, including a display substrate 110, where the display substrate 110 includes a bending portion 111 and a binding portion 112 adjacent to the bending portion 111, the display panel further includes a flexible circuit board 120 bound to the binding portion 112, and a protective layer 130 located on a side of the display substrate 110 away from the flexible circuit board 120, where the protective layer 130 includes a target portion 131 facing the flexible circuit board 120 and dislocated from the display substrate 110, the target portion 131 is provided with a drainage cavity 132, and the drainage cavity 132 contains an organic insulating adhesive.
In the embodiment of the invention, a gap exists between the target part of the protective layer and the flexible circuit board, and the drainage cavity and the gap can be filled with the coated organic insulating glue along the drainage cavity by arranging the drainage cavity in the target part, so that under the condition that the gap is pulled open due to the bending of the subsequent display panel, enough organic insulating glue can be arranged in the gap to protect the pins of the flexible circuit board, the pins of the flexible circuit board are prevented from being exposed, the pins of the flexible circuit board are prevented from being corroded by water vapor, and the display quality of the display device is ensured. Therefore, the technical scheme provided by the invention can avoid the exposure of the pins of the flexible circuit board, thereby preventing the pins of the flexible circuit board from being corroded by water vapor and ensuring the display quality of the display device.
As shown in fig. 1 and 2, the display substrate 110 is a flexible display substrate, the display substrate 110 is divided into a display portion 113, a bending portion 111 and a binding portion 112, the bending portion 111 is located at a periphery of the display portion 113, and the binding portion 112 is located at a side of the bending portion 111 away from the display portion 113.
The bending portion 111 bends to drive the binding portion 112 to fold towards the back side of the display portion 113, so that the binding portion 112 can be located at the back side of the display portion 113, the frame width of the display device can be reduced, and the screen occupation ratio of the display device is improved.
The flexible circuit board 120 includes a plurality of pins 121, and each pin 121 is connected to a corresponding conductive pattern in the binding portion 112 in a binding manner, so that a plurality of sub-pixels in the display substrate 110 can be controlled to emit light, and normal display of a picture can be achieved.
The protection layer 130 is disposed on the back side of the display substrate 110 and is used for protecting the display substrate 110, preventing the stress on the display substrate 110 from being too large during the bending process, and avoiding the generation of cracks. The protection layer 130 may be an organic material layer having better flexibility, so as to reduce the bending radius of the display panel.
The target portion 131 is a portion of the protection layer 130 beyond the display substrate 110 due to the existence of the adhesion tolerance, taking a reference plane parallel to the display substrate 110 as an example, an orthogonal projection of the target portion 131 on the reference plane does not coincide with an orthogonal projection of the display substrate 110 on the reference plane, and an orthogonal projection of the target portion 131 on the reference plane is located inside an orthogonal projection of the flexible circuit board 120 on the reference plane.
In the related art, as shown in fig. 3, after the flexible circuit board 320 is bonded to the bonding portion 312 (actually, the bonding portion is covered by the protection layer, and therefore, the bonding portion is shown by a dotted line in fig. 3), the pins 321 of the flexible circuit board (the portion covered by the protection layer is shown by a dotted line) are protected by applying an organic insulating adhesive, so that the pins 321 of the flexible circuit board 320 are prevented from being corroded by water vapor. However, due to the adhesion tolerance, there is a gap between the target portion 333 and the flexible circuit board 120, and the organic insulating paste is less likely to enter the gap, so that cracks are likely to be generated in the gap after the display panel is bent, and water and oxygen may corrode the pins 321 of the flexible circuit board 320 through the cracks, thereby causing a problem that the display device is abnormal.
In the embodiment of the present invention, as shown in fig. 2 and fig. 4, fig. 2 is a sectional view taken along line a-a' of fig. 4. The drainage cavity 132 is formed in the target portion 131, so that the volume of a gap between the target portion 131 and the flexible circuit board 120 is increased, more organic insulators are guided to flow into the gap, cracks are prevented from occurring after the display panel is bent, the invasion path of water and oxygen to the pins 121 of the flexible circuit board 120 is blocked, and the display quality of the display device is ensured.
Wherein, the quantity of above-mentioned drainage chamber 132 can be a plurality of, and a plurality of drainage chambers 132 lie in the volume that increases the gap jointly on the collinear, and of course, a plurality of drainage chambers 132 can also arrange in other modes, do not limit here. In addition, the plurality of drainage lumens 132 may be interconnected to form an integrated flow channel.
The organic insulating paste may be MC L paste.
Further, as shown in fig. 2, at least a portion of the drainage cavity 132 is disposed opposite to the pins 121 of the flexible circuit board 120.
In this way, the space of the gap corresponding to the pin 121 of the flexible circuit board 120 is large, so that the thickness of the organic insulating layer at the position is thick, and after the display panel is bent, the position where the organic insulating layer is thick is not easy to generate the gap, so that the pin 121 of the flexible circuit board 120 cannot be invaded by water and oxygen, and the corrosion of the pin 121 of the flexible circuit board 120 by water and oxygen is avoided.
Further, as shown in fig. 2, an end of the target portion 131 away from the bent portion 111 is opened, and the opening is communicated with the drainage cavity 132.
When the accommodating cavity is not communicated with one end of the target portion 131 far away from the bent portion 111, the organic insulating glue in the gap can also be increased due to the increase of the space of the gap, but the entrance of the organic insulating glue into the gap is smaller, and the organic insulating glue in the gap is less.
In this embodiment, an opening is formed in one end of the target portion 131, which is far away from the bending portion 111, so that an entrance of the organic insulating adhesive into the gap can be enlarged, and the organic insulating adhesive can enter the gap more conveniently, and more organic insulating adhesive is added in the gap in this embodiment compared with a scheme without an opening, so that a better effect of preventing the display panel from cracking after bending is achieved, a better effect of preventing the pin 121 of the flexible circuit board 120 from being corroded by water and oxygen is achieved, and a display effect of the display device is further ensured.
Further, the protection layer 130 further includes a folding portion 133, the folding portion 133 defines a through hole 134 penetrating through the protection layer 130, and an orthographic projection of the folding portion 133 on the display substrate 110 coincides with the bending portion 111.
The folded portion 133 of the protection layer 130 refers to a portion in which the protection layer 130 is folded when the bent portion 111 of the display substrate 110 is bent.
When the display panel is bent, the thickness of the film layer at the bending position of the display panel is thick, which results in a larger bending radius of the display panel. In addition, the through hole 134 penetrating the protection layer 130 is formed in the folding portion 133, so that mutual squeezing of the inside of the protection layer 130 during folding can be avoided, and the folding stress of the protection layer 130 can be reduced.
Further, as shown in fig. 1 and 5, the through hole 134 is in a long strip shape, and a length direction of the through hole 134 is perpendicular to a bending direction of the display panel.
Since there is no conductive pattern inside the protection layer 130, the through hole 134 can be designed to be a long strip shape, which does not affect the normal display of the display substrate 110, and can reduce or even eliminate the stress generated by the mutual extrusion inside the protection layer 130 when it is folded.
Further, the protective layer 130 includes an adhesive layer and a resin layer, and the adhesive layer is located between the resin layer and the display substrate 110.
The adhesive layer secures the resin layer to the display substrate 110 to protect the display substrate 110 when the display substrate 110 is bent.
The embodiment of the invention also provides a display device which comprises the display panel.
The display device may be a display, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, etc.
An embodiment of the present invention further provides a manufacturing method of a display panel, which is applied to the display panel described above, and as shown in fig. 6, the method includes:
step 601: manufacturing a protective layer on a display substrate, wherein the protective layer comprises a target part which is staggered with the display substrate;
step 602: a drainage cavity is formed in the target part;
step 603: binding a flexible circuit board with a binding part of the display substrate, wherein the flexible circuit board is arranged opposite to the target part;
step 604: an organic insulating paste is applied between the flexible circuit board and the target portion.
In the embodiment of the invention, a gap exists between the target part of the protective layer and the flexible circuit board, and the drainage cavity and the gap can be filled with the coated organic insulating glue along the drainage cavity by arranging the drainage cavity in the target part, so that under the condition that the gap is pulled open due to the bending of the subsequent display panel, enough organic insulating glue can be arranged in the gap to protect the pins of the flexible circuit board, the pins of the flexible circuit board are prevented from being exposed, the pins of the flexible circuit board are prevented from being corroded by water vapor, and the display quality of the display device is ensured. Therefore, the technical scheme provided by the invention can avoid the exposure of the pins of the flexible circuit board, thereby preventing the pins of the flexible circuit board from being corroded by water vapor and ensuring the display quality of the display device.
As shown in fig. 1 and 2, the display substrate 110 is a flexible display substrate, the display substrate 110 is divided into a display portion 113, a bending portion 111 and a binding portion 112, the bending portion 111 is located at a periphery of the display portion 113, and the binding portion 112 is located at a side of the bending portion 111 away from the display portion 113.
The bending portion 111 bends to drive the binding portion 112 to fold towards the back side of the display portion 113, so that the binding portion 112 can be located at the back side of the display portion 113, the frame width of the display device can be reduced, and the screen occupation ratio of the display device is improved.
The flexible circuit board 120 includes a plurality of pins 121, and each pin 121 is connected to a corresponding conductive pattern in the binding portion 112 in a binding manner, so that a plurality of sub-pixels in the display substrate 110 can be controlled to emit light, and normal display of a picture can be achieved.
The protection layer 130 is disposed on the back side of the display substrate 110 and is used for protecting the display substrate 110, preventing the stress on the display substrate 110 from being too large during the bending process, and avoiding the generation of cracks. The protection layer 130 may be an organic material layer having better flexibility, so as to reduce the bending radius of the display panel.
The target portion 131 is a portion of the protection layer 130 beyond the display substrate 110 due to the existence of the adhesion tolerance, and taking a reference plane parallel to the display substrate 110 as an example, the orthographic projection of the target portion 131 on the reference plane is not coincident with the orthographic projection of the display substrate 110 on the reference plane.
In the related art, as shown in fig. 3, after the flexible circuit board 320 is bonded to the bonding portion 312 (actually, the bonding portion is covered by the protection layer, and therefore, the bonding portion is shown by a dotted line in fig. 3), the pins 321 of the flexible circuit board (the portion covered by the protection layer is shown by a dotted line) are protected by applying an organic insulating adhesive, so that the pins 321 of the flexible circuit board 320 are prevented from being corroded by water vapor. However, due to the adhesion tolerance, there is a gap between the target portion 333 and the flexible circuit board 120, and the organic insulating paste is less likely to enter the gap, so that cracks are likely to be generated in the gap after the display panel is bent, and water and oxygen may corrode the pins 321 of the flexible circuit board 320 through the cracks, thereby causing a problem that the display device is abnormal.
In the embodiment of the present invention, as shown in fig. 2 and 4, the drainage cavity 132 is formed in the target portion 131, so as to increase the volume of the gap between the target portion 131 and the flexible circuit board 120, and guide more organic insulating members to flow into the gap, thereby preventing cracks from occurring after the display panel is bent, blocking the intrusion path of water and oxygen to the pins 121 of the flexible circuit board 120, and ensuring the display quality of the display device.
Wherein, the quantity of above-mentioned drainage chamber 132 can be a plurality of, and a plurality of drainage chambers 132 lie in the volume that increases the gap jointly on the collinear.
Further, after the protective layer is formed on the display substrate, the method further includes:
a through hole 134 penetrating through the protective layer is formed in the folding portion 133 of the protective layer, and the orthographic projection of the folding portion 133 on the display substrate coincides with the bending portion.
The folded portion 133 of the protection layer 130 refers to a portion in which the protection layer 130 is folded when the bent portion 111 of the display substrate 110 is bent.
When the display panel is bent, the thickness of the film layer at the bending position of the display panel is thick, which results in a larger bending radius of the display panel. In addition, the through hole 134 penetrating the protection layer 130 is formed in the folding portion 133, so that mutual squeezing of the inside of the protection layer 130 during folding can be avoided, and the folding stress of the protection layer 130 can be reduced.
As shown in fig. 1 and 5, the through hole 134 may have a long bar shape, and a length direction of the through hole 134 is perpendicular to a bending direction of the display panel. Since there is no conductive pattern inside the protection layer 130, the through hole 134 can be designed to be a long strip shape, which does not affect the normal display of the display substrate 110, and can reduce or even eliminate the stress generated by the mutual extrusion inside the protection layer 130 when it is folded.
Further, the manufacturing of the protective layer on the display substrate includes:
forming an adhesive layer on the display substrate;
and forming a resin layer on the adhesive layer.
The adhesive layer secures the resin layer to the display substrate 110 to protect the display substrate 110 when the display substrate 110 is bent.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a display panel, includes display substrate, display substrate including buckle the part and with buckle the part adjacent binding part of part, its characterized in that, still include with bind the flexible circuit board that the part was bound, and be located display substrate keeps away from the protective layer of flexible circuit board one side, wherein, the protective layer include with flexible circuit board just right and with the target portion of display substrate dislocation, the drainage chamber has been seted up to the target portion, organic insulating cement has been acceptd in the drainage chamber.
2. The display panel of claim 1, wherein at least some of the drainage cavities are disposed opposite the leads of the flexible circuit board.
3. The display panel of claim 1, wherein an end of the target portion away from the bent portion is opened, and the opening is communicated with the drainage cavity.
4. The display panel according to claim 1, wherein the protective layer further comprises a folded portion, the folded portion has a through hole penetrating through the protective layer, and an orthographic projection of the folded portion on the display substrate coincides with the bent portion.
5. The display panel according to claim 4, wherein the through hole has a long bar shape, and a length direction of the through hole is perpendicular to a bending direction of the display panel.
6. The display panel according to claim 1, wherein the protective layer comprises an adhesive layer and a resin layer, the adhesive layer being between the resin layer and the display substrate.
7. A display device characterized by comprising the display panel according to any one of claims 1 to 6.
8. A method for manufacturing a display panel, applied to the display panel according to any one of claims 1 to 6, the method comprising:
manufacturing a protective layer on a display substrate, wherein the protective layer comprises a target part which is staggered with the display substrate;
a drainage cavity is formed in the target part;
binding a flexible circuit board with a binding part of the display substrate, wherein the flexible circuit board is arranged opposite to the target part;
an organic insulating paste is applied between the flexible circuit board and the target portion.
9. The method according to claim 8, applied to the display panel according to claim 4; after the protective layer is manufactured on the display substrate, the method further comprises the following steps:
and arranging a through hole penetrating through the protective layer at the folding part of the protective layer, wherein the orthographic projection of the folding part on the display substrate is superposed with the bending part.
10. The method according to claim 8, applied to the display panel according to claim 6; manufacturing a protective layer on a display substrate, comprising:
forming an adhesive layer on the display substrate;
and forming a resin layer on the adhesive layer.
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