CN109166894B - Display panel, manufacturing method thereof, protective film and display device - Google Patents
Display panel, manufacturing method thereof, protective film and display device Download PDFInfo
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- CN109166894B CN109166894B CN201811012892.1A CN201811012892A CN109166894B CN 109166894 B CN109166894 B CN 109166894B CN 201811012892 A CN201811012892 A CN 201811012892A CN 109166894 B CN109166894 B CN 109166894B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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Abstract
The invention discloses a display panel and a manufacturing method thereof, a protective film and a display device, wherein the display panel comprises: a display area, a non-display area and a bending area; the display device comprises a flexible substrate, a display layer and a bending protective layer, wherein the bending protective layer is positioned in a non-display area, and at least part of the bending protective layer is positioned in a bending area; the bending protection layer comprises an upper surface, a lower surface and a side surface connecting the upper surface and the lower surface; in at least one first section, the length of the vertical projection of the side surface on the flexible substrate is L, the length of the upper surface and the lower surface in the direction vertical to the display panel is D, wherein L is more than or equal to 0 and less than or equal to D/10, and the first section is vertical to the display panel and is vertical to the edge of the cut display panel. The invention effectively avoids the stress concentration on the circuit wires at the edge of the bending area during bending, so that the stress on the circuit wires in the display layer in the bending area is more uniform.
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, a protective film and a display device.
Background
The development of the conventional flat panel display device technology is becoming mature, and along with the improvement of the display technology, the flexible display panel is also gradually popularized. The existing flexible display panel is made of a soft substrate material, can be bent and curled, has the characteristics of low power consumption, small volume, various display modes and the like, and becomes one of hot spots of research in the field of flexible display in recent years.
In the existing flexible display panel, the substrate generally includes a display region and a non-display region surrounding the display region, the non-display region is provided with a flexible circuit board provided with an integrated circuit for providing a light emitting display signal to the organic light emitting diode of the display region. And the non-display area is also provided with a metal wire which is used for connecting the display area and the flexible circuit board and can be bent.
The stress caused by bending the metal wire at the bent part when the existing flexible display device is bent is large, so that the metal wire is easy to break at the bent part, and the service life of the flexible display device is shortened.
Disclosure of Invention
The invention provides a display panel, a manufacturing method thereof, a protective film and a display device.
An embodiment of the present invention provides a display panel, including: the display device comprises a display area and a non-display area surrounding the display area, wherein the non-display area comprises a bending area positioned on one side of the display area; the display device comprises a flexible substrate and a display layer positioned on one side of the flexible substrate; the bending protective layer is arranged on one side of the display layer, which is far away from the flexible substrate, is positioned in the non-display area, and at least part of the bending protective layer is positioned in the bending area; the bending protective layer comprises an upper surface, a lower surface and a side surface connecting the upper surface and the lower surface, the upper surface is the surface of one side of the bending protective layer far away from the flexible substrate, and the lower surface is the surface of one side of the bending protective layer close to the flexible substrate; in at least one first section, the length of the vertical projection of the side surface on the flexible substrate is L, the length of the upper surface and the lower surface in the direction vertical to the display panel is D, wherein L is more than or equal to 0 and less than or equal to D/10, and the first section is vertical to the display panel and is vertical to the edge of the cut display panel.
The embodiment of the invention also provides a manufacturing method of the display panel, which comprises the following steps: providing a flexible substrate, wherein the flexible substrate comprises a preset display area and a preset non-display area surrounding the preset display area, the preset non-display area comprises a preset bending area positioned on one side of the preset display area in the second direction, the relative arrangement direction between the preset display area and the preset bending area is taken as a third direction, and the preset cutting areas are positioned on two sides of the preset bending area in the third direction; the second direction and the third direction intersect; forming a display layer on one side of a flexible substrate; attaching a protective film to one side of the display layer, which is far away from the flexible substrate, wherein the protective film at least comprises a first adhesive film covering a preset cutting area; coating a bending protective agent, wherein the bending protective agent covers the preset bending area; and removing at least the first adhesive film and removing the preset cutting area.
The embodiment of the invention also provides a protective film which at least comprises two first sticking films, a second sticking film and a hollow part, wherein the hollow part and the two first sticking films are positioned on the same side of the first sticking films, the hollow part is positioned between the two first sticking films, and the first sticking films and the second sticking films semi-surround the hollow part.
The embodiment of the invention also provides a display device which comprises the display panel provided by the invention.
Compared with the prior art, the display panel, the manufacturing method thereof, the protective film and the display device provided by the invention at least realize the following beneficial effects:
in a first cross section of the display panel, the length of a vertical projection of the side surface on the flexible substrate is L, the length of the upper surface and the lower surface in the direction vertical to the display panel is D, wherein L is more than or equal to 0 and less than or equal to D/10, and the first cross section is vertical to the display panel and is vertical to the edge of the cut display panel. The side surfaces of the upper surface and the lower surface are close to and perpendicular to the upper surface and the lower surface, so that the circuit wiring with stress concentrated at the edge of the bending area during bending is effectively avoided, and the stress on the circuit wiring in the display layer in the bending area is uniform.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic plan view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the display panel of FIG. 1 after bending;
FIG. 3 is a sectional view of the display panel of FIG. 1 taken along line A-A';
FIG. 4 is a cross-sectional view taken along line B-B' of the display panel of FIG. 1;
fig. 5 is a schematic cross-sectional view of a bending protection layer according to an embodiment of the invention;
FIG. 6 is a schematic diagram of a first cross-section provided by an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another first cross-section provided by an embodiment of the present invention;
FIG. 8 is a schematic diagram of a planar structure of another display panel according to an embodiment of the present invention;
FIG. 9 is a left side view of the display panel of FIG. 8;
fig. 10 is a flowchart of a method for manufacturing a display panel according to an embodiment of the invention;
fig. 11 is a schematic plan view illustrating a middle display panel formed before step S105;
fig. 12 is a schematic plan view illustrating another middle display panel formed before step S105;
fig. 13 is a schematic plan view illustrating another middle display panel formed before step S105;
FIG. 14 is a left side view of the mid-section display panel of FIG. 13;
FIG. 15 is a schematic plan view illustrating another middle display panel formed before step S105;
fig. 16 is a schematic plan view illustrating a protective film according to an embodiment of the present invention;
fig. 17 is a schematic plan view of another protection film according to an embodiment of the present invention;
fig. 18 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic plan structure view of a display panel according to an embodiment of the present invention, fig. 2 is a schematic structural view of the display panel in fig. 1 after being bent, fig. 3 is a structural view of a cross section of the display panel in fig. 1 along a-a ', fig. 4 is a structural view of a cross section of the display panel in fig. 1 along B-B', and referring to fig. 1-4, an embodiment of the present invention provides a display panel including: a display area AA and a non-display area NA surrounding the display area AA, the non-display area NA including a bending area 10 at one side of the display area AA;
of course, the embodiment of the present application only illustrates the bending region on one side of the display region, and the bending regions may be disposed around the display region in other optional embodiments of the present invention, which is not limited in the present invention.
Optionally, the bending axis of the bending area is parallel to the edge of the display panel, and the bending area bends toward the side away from the light emitting surface of the display panel, which is beneficial to realizing the narrow frame of the display panel.
A flexible substrate 20 and a display layer 30 on one side of the flexible substrate 20;
alternatively, the display layer 30 includes an array layer, an organic light emitting display element layer disposed on the array layer, and an encapsulation layer, which, of course, does not limit the present invention, and the display layer 30 may also include other structures.
The bending protective layer 40 is arranged on one side of the display layer 30, which is far away from the flexible substrate 20, the bending protective layer 40 is positioned in the non-display area NA, and at least part of the bending protective layer 40 is positioned in the bending area 10;
the bending protection layer 40 comprises an upper surface 41, a lower surface 42 and a side surface 43 connecting the upper surface 41 and the lower surface 42, wherein the upper surface 41 is the surface of the bending protection layer 40 on the side away from the flexible substrate 20, and the lower surface 42 is the surface of the bending protection layer 40 on the side close to the flexible substrate 20;
it will be appreciated that the upper and lower surfaces 41, 42 are substantially parallel to the plane of the flexible substrate 20.
In at least one first cross section 50, the length of the vertical projection of the side surface 43 on the flexible substrate 20 is L, the length of the upper surface 41 and the lower surface 42 in the direction perpendicular to the display panel is D, wherein L is greater than or equal to 0 and less than or equal to D/10, and the first cross section 50 is perpendicular to the display panel and perpendicular to the edge of the cut display panel.
It is understood that the case of 0 ═ L does not exist in the vertical projection of the side surface 43 on the plane of the flexible substrate 20, but means that the plane of the side surface 43 is perpendicular to the plane of the flexible substrate, and therefore, in the first cross section 50, the vertical projection of the side surface 43 on the plane of the flexible substrate 20 appears as a point, and the length of the point is regarded as 0.
Specifically, with reference to fig. 1 to 4, in the display panel provided in the embodiment of the present invention, the display area AA is used for displaying a picture, the areas outside the display area AA are the non-display area NA, and the display layer 30 includes elements for displaying in the display area AA, and various driving circuits and circuit traces for driving the elements for displaying in the display area AA in the non-display area NA. The non-display area NA includes a bending area 10 located at one side of the display area AA, and a bending protection layer 40 is disposed in the non-display area NA, and the bending protection layer 40 covers the bending area 10. When the bending region 10 of the display panel is bent, the bending protection layer 40 protects the display layer 30 in the bending region 10, and simultaneously effectively reduces the stress on the circuit traces in the display layer 30 in the bending region 10, and effectively reduces the probability of the circuit trace damage in the display layer 30 caused by the excessive stress during bending.
Optionally, the bending protection layer material includes: the bending protection layer is made of UV glue, and the bending protection layer may be made of other materials.
Optionally, the bending protection layer is a coating or a liquid curing layer or a liquid solution curing layer with low viscosity.
The non-display area NA is provided with one side of the bending area 10, on one hand, because the circuit is less, and on the other hand, the module assembly at the later stage can occupy less space, both sides of the bending area 10 in the non-display area NA can be cut and narrowed, and because the bending protective agent forming the bending protective layer 40 is a low-viscosity liquid solution before being cured. In order not to influence among the prior art and cut the both sides of district of buckling in the non-display area, will keep the certain distance with the cutting limit when buckling the coating of protective agent to the thickness of the edge of the protective layer of buckling is less, and the less region of thickness is great, thereby the circuit of the edge of the district of buckling when buckling walks line stress concentration, and the circuit in the middle of the district of buckling walks the line and bears bigger stress.
In the first cross section 50 of the display panel, the length of the vertical projection of the side surface 43 on the flexible substrate 20 is L, and the length of the upper surface 41 and the lower surface 42 in the direction perpendicular to the display panel is D, wherein L is greater than or equal to 0 and less than or equal to D/10, and the first cross section 50 is perpendicular to the display panel and perpendicular to the edge of the cut display panel. The side 43 connecting the upper surface 41 and the lower surface 42 is approximately perpendicular to the upper surface 41 and the lower surface 42, which effectively prevents the stress from concentrating on the circuit trace at the edge of the bending region 10 during bending, so that the stress on the circuit trace in the display layer 30 in the bending region 10 is relatively uniform.
In addition, in the process of cutting the two sides of the bending region 10 in the non-display region NA, the cutting edge is subjected to a large impact and the stress is concentrated, so that on one hand, the film layer at the position of the cutting edge is not desired to be thick, and on the other hand, the stress problem at the position close to the cutting edge is desired to be relieved. Through the embodiment of the invention, the bending protection layer 40 does not cover the areas cut off at the two sides of the bending area 10 in the non-display area NA, the thickness of the film layer at the position of the cut edge cannot be influenced by the bending protection layer 40, namely, the bending protection layer 40 is not cut during cutting, meanwhile, the range of the bending area 10 covered by the side surface in the bending protection layer 40 is smaller, the plane where the side surface is located is approximately vertical to the plane where the flexible substrate is located, namely, the thickness at the edge of the bending protection layer 40 is more uniform, and the stress cannot be concentrated on the circuit wiring at the edge of the bending area 10 during bending, so that the stress on the circuit wiring in the display layer 30 in the bending area 10 is more uniform.
Fig. 5 is a schematic cross-sectional structure view of a bending protection layer according to an embodiment of the present invention, referring to fig. 5, optionally, wherein the side surface 43a includes a vertical portion 44 connecting the lower surface 42 and an arc portion 45 connecting the vertical portion 44 and the upper surface 41, and the vertical portion 44 extends in a direction substantially perpendicular to the display panel.
Specifically, with continued reference to fig. 5, in the bending protection layer 40, the side surface 43a includes a vertical portion 44 and an arc portion 45, since the bending protection layer 40 is formed by curing a low-viscosity bending protection agent, and since a protection film exists on both sides of the bending protection layer 40 when the bending protection agent is applied, the protection film has a certain hydrophobicity, and the arc portion 45 exists in the side surface 43a of the bending protection layer 40 formed after curing and attached to the protection film.
Fig. 6 is a schematic structural diagram of a first cross section provided in an embodiment of the present invention, referring to fig. 6, and optionally, in the first cross section 50a, the side surface 43b is in a sawtooth shape.
Specifically, with continued reference to fig. 5, since the bending protection layer 40 is formed by curing a low-viscosity bending protection agent, since the protection films are present on both sides of the bending protection layer 40 when the bending protection agent is applied, the protection films may be partially coated with the bending protection agent at the adhesion portion when the protection films are peeled off after the bending protection agent is cured, and thus the side surface 43b has an uneven structure.
It should be noted that, in the embodiment of the present invention, it is not limited that the side surface includes the vertical portion and the arc portion, or the side surface is an uneven structure, when a hydrophilic protective film is used, the side surface in the bent protective layer formed after curing may slightly tilt, or due to a process, the side surface in the bent protective layer may also be another structure.
FIG. 7 is a schematic structural diagram of another first cross section provided in an embodiment of the present invention, referring to FIG. 7, optionally, wherein in the first cross section 50b, a first gap 60 is provided between the side surface 43 and an edge of the display panel adjacent thereto, and a shortest distance of the first gap 60 in a first direction X is d1, wherein d1 is greater than or equal to 0 and less than or equal to 200 μm, and the first direction X is parallel to the first cross section 50b and the display panel.
Specifically, with reference to fig. 7, a first gap 60 is provided between the side surface 43 and the edge of the display panel close thereto, the shortest distance of the first gap 60 in the first direction X is d1, and d1 is greater than or equal to 0 and less than or equal to 200 μm, that is, when the display panel is cut, the bending protection layer 40 is not cut, so as to avoid the occurrence of laser cutting carbonization marks. D1 is more than 0 and less than or equal to 200 mu m, namely, a certain distance exists between the side surface 43 of the bent protective layer 40 and the edge of the display panel, so that a certain distance exists between the cutting edge and the side surface 43 of the bent protective layer 40 when the display panel is cut, the bent protective layer 40 is effectively prevented from being cut when the display panel is cut, and the difficulty of the cutting process is reduced. Meanwhile, the shortest distance of the first interval 60 in the first direction X is less than or equal to 200 μm, and does not affect the stress of the circuit trace at the edge of the bending region 10 when bending.
Combine the above-mentioned analysis of this application, the in-process of cutting is carried out to the both sides of the district of buckling 10 in the non-display area NA can further be improved through the protective layer of buckling of this affair embodiment, cuts the problem that the cutting edge position rete that the protective layer 40 of buckling caused is thick, can not have the influence to the stress of the circuit line of the edge at the district of buckling 10 when buckling simultaneously, and the stress that the circuit line in the display layer 30 in the district of buckling 10 received is comparatively even.
Fig. 8 is a schematic plan view illustrating another display panel according to an embodiment of the present invention, and fig. 9 is a left side view of the display panel in fig. 8, referring to fig. 8 and 9, and optionally, the non-display area NA further includes a bonding area 70 located on the same side of the display area AA as the bending area 10;
the flexible circuit board 71 is bound to the binding area 70;
the bending protection layer 40 extends at least partially to the bonding area 70 and covers the side of the flexible circuit board 71 away from the flexible substrate.
Specifically, with continuing reference to fig. 8 and 9, the non-display area NA further includes a binding area 70 located on the same side of the display area AA as the bending area 10, the binding area 70 is located on a side of the bending area 10 away from the display area AA, the flexible circuit board 71 is bound to the binding area 70, the circuit traces in the non-display area NA in the display layer 30 are connected to the flexible circuit board 71 through the bending area 10, the bending protection layer 40 protects the circuit traces connected to the flexible circuit board 71 through the bending area 10, and the probability of damage to the circuit traces connected to the flexible circuit board 71 in the display layer 30 due to excessive stress during bending is effectively reduced.
In other words, the display area and the binding area are respectively located in the non-bending area on two opposite sides of the bending area, and are bent towards one side away from the light-emitting surface of the display panel with the bending area, so that the binding area is reversely bent to the back of the display panel. The frame width of the display panel is reduced, and meanwhile, sufficient placing space and a flat binding area surface are provided for other devices bound with the binding area, such as a Flexible Printed Circuit (FPC), a control chip (IC) and the like.
Optionally, the bending protection layer extends to the non-bending areas on two sides of the bending area, covers at least part of the binding area and binds devices on the binding area, on one hand, the devices and circuit wiring in the binding area can be protected, on the other hand, the film layer structure in the non-bending area of the bending area can be kept as consistent as possible, or a transition is formed when a film layer (such as the bending protection layer) changes, in addition, the edge of the bending protection layer can be prevented from falling into the bending area, and the edge of the bending protection layer is effectively prevented from being separated from the display panel when the bending area is bent.
Fig. 10 is a flowchart of a manufacturing method of a display panel according to an embodiment of the present invention, and referring to fig. 10, the manufacturing method of a display panel according to an embodiment of the present invention includes:
s101, providing a flexible substrate, wherein the flexible substrate comprises a preset display area and a preset non-display area surrounding the preset display area, the preset non-display area comprises a preset bending area positioned on one side of the preset display area in a second direction, the relative arrangement direction between the preset display area and the preset bending area is taken as a third direction, and the preset cutting areas are positioned on two sides of the preset bending area in the third direction; the second direction and the third direction intersect.
And S102, forming a display layer on one side of the flexible substrate.
S103, attaching a protective film to one side, far away from the flexible substrate, of the display layer, wherein the protective film at least comprises a first adhesive film covering a preset cutting area.
S104, coating a bending protective agent, wherein the bending protective agent covers the preset bending area.
It can be understood that "preset" in this application refers to a premise for forming a certain portion in a display panel manufacturing process, where a certain preset region, that is, a region corresponding to a certain region displayed in a final display panel in the manufacturing process, is defined as a row where a bending region is preset for forming a bending region in the display panel, and where the bending region is located, that is, where the bending region is located in the final manufactured display panel.
Referring to fig. 11, fig. 11 is a schematic plan view of a middle display panel formed before step S105, where the "middle display panel" refers to a display panel in the manufacturing process. The flexible substrate 20 includes a preset display area AA1 and a preset non-display area NA1 surrounding the preset display area AA1, the preset non-display area NA1 includes a preset bending area 10a located at one side of the preset display area AA1 in the second direction Y and preset cutting areas 80 located at both sides of the preset bending area 10a in the third direction B, and the protective film 90 at least includes a first adhesive film 91 covering the preset cutting areas 80. And coating a bending protective agent, wherein the bending protective agent covers the preset bending area 10a, the bending protective layer 40 is formed after the bending protective agent is cured, the bending protective layer 40 is positioned in the preset non-display area NA1, and at least part of the bending protective layer 40 is positioned in the preset bending area 10 a.
S105, removing at least the first adhesive film and removing the preset cutting area.
It should be noted that the cutting step described herein may be a single cutting step, or may be the same cutting step as the cutting step of the large substrate into the small substrates, and the embodiment of the present invention is not limited thereto. It is understood that the large substrate referred to herein is understood to be a film layer forming a flexible substrate, the large substrate comprising a plurality of small substrates, each small substrate corresponding to a display panel under manufacture.
With continued reference to fig. 1 and 11, after the bending protective agent is cured to form the bending protective layer 40, the first adhesive film 91 is removed, and the predetermined cutting area 80 is removed. In the display panel manufactured by the manufacturing method of the display panel provided by the embodiment of the invention, due to the existence of the protective film 90, the side surfaces of the bending protective layer 40, which are connected with the upper surface and the lower surface, are approximately perpendicular to the upper surface and the lower surface, that is, the whole thickness of the bending protective layer 40 is relatively uniform, so that the circuit wiring, which is concentrated on the edge of the bending area 10 by stress during bending, is effectively avoided, and the stress on the circuit wiring in the display layer 30 in the bending area 10 is relatively uniform.
Optionally, the first adhesive film has certain hydrophobicity, so that the bending protective agent which is a liquid solution and is used for manufacturing the bending protective layer and can effectively intercept diffusion, and the first adhesive film is difficult to take down as the bending protective layer formed after the bending protective agent is solidified is too tightly bonded with the first adhesive film.
Optionally, wherein the first patch has an adhesion of less than 5 gf/in;
removing the first film and removing the preset cutting area, comprising:
the first adhesive film is torn from the display panel, and the preset cutting area is cut and removed along a first cutting edge, wherein the first cutting edge is a junction of the preset bending area and the preset cutting area.
With reference to fig. 11, the adhesion of the first adhesive film 91 is less than 5gf/in, that is, the first adhesive film 91 is a weak adhesion film, and after the first adhesive film 91 is used to make the overall thickness of the bending protection layer 40 uniform, the first adhesive film 91 can be directly torn from the display panel, and then the predetermined cutting area 80 is cut and removed along the first cutting edge 81.
Optionally, a first film 91 covers the first cut edge 81, as described in more detail below.
Optionally, the protective film includes a first protective film, and the first protective film includes a first adhesive film and a second adhesive film covering the preset display region;
removing at least the first adhesive film and removing the preset cutting area comprises:
and simultaneously removing the first adhesive film and the preset cutting area by cutting.
Fig. 12 is a schematic plan view of another middle-stage display panel formed before step S105, and referring to fig. 12, the protection film 90 includes a first protection film 92, the first protection film 92 includes a first adhesive film 91 and a second adhesive film 93 covering the predetermined display area AA1, the first protection film 92 is an integrally formed structure, the adhesion of the first protection film 92 is over 100gf/in, and the first protection film 92 is a film layer that can remain in the display panel.
Before the coating protective agent that buckles, attached first protection film 92, cutting area 80 is predetermine in first pad pasting 91 cover, display area AA1 is predetermine in second pad pasting 93 cover, first protection film 92 is for can be for the rete multiplexing that originally exists in the display panel is protection film 90, treat that the protective agent solidification of bending forms the protection layer 40 back of buckling, get rid of first pad pasting 91 and predetermineeing cutting area 80 through cutting process, need not to make first pad pasting 91 alone, tear first pad pasting 91 alone again, effectively reduce the process step, reduce manufacturing cost, and need not to attach a rete alone again, it makes to reduce the technology.
Optionally, the first protective film is one or more of a barrier layer or a polarizer.
With continued reference to fig. 12, one or more of a barrier layer or polarizer may be reused as the first protective film 92. The barrier layer may be inorganic or a plurality of inorganic-organic alternately stacked layers.
It is understood that, in the embodiments of the present invention, the first protection film is not limited to be one or more of a barrier layer and a polarizer, and may also be reused as the first protection film for other films in the display panel.
One or more of the barrier layer or the polarizer can be reused as the first protective film, a layer of film does not need to be attached independently, the number of processes is reduced, and meanwhile, when the polarizer is reused as the first protective film, the alignment of the polarizer is more accurate, and the alignment of the polarizer is utilized, so that the accuracy of the attaching position of the first adhesive film can be improved.
With reference to fig. 12, optionally, the first film 91 is cut off from the first cutting edge 81, and the first cutting edge 81 is a boundary between the predetermined bending region 10a and the predetermined cutting region 80.
Specifically, after the bending protective agent is cured to form the bending protective layer 40, the first adhesive film 91 and the preset cutting area 80 are removed simultaneously through a cutting process, that is, the first adhesive film 91 and the preset cutting area 80 can be removed simultaneously by cutting along the first cutting edge 81 at the junction of the preset bending area 10a and the preset cutting area 80, the bending protective layer 40 cannot be cut during cutting, and meanwhile, no first adhesive film 91 is left in the display panel after cutting.
Optionally, the method for manufacturing the display panel further includes:
after the display layer is formed and before the protective film is attached, a packaging layer is formed on one side, away from the flexible substrate, of the display layer, and the packaging layer covers the preset display area;
the attaching of the protective film includes: attaching a protective film to one side of the packaging layer, which is far away from the flexible substrate, wherein the protective film comprises a second protective film, and the second protective film comprises a first adhesive film and a third adhesive film covering the packaging layer;
the adhesion force of the second protective film is less than 5 gf/in;
removing the first adhesive film and removing the preset cutting area comprises:
tearing off the second protective film from the display panel, and cutting off the preset cutting area along a first cutting edge, wherein the first cutting edge is a junction of the preset bending area and the preset cutting area.
Fig. 13 is a schematic plan view illustrating another middle-segment display panel formed before step S105, and fig. 14 is a left side view of the middle-segment display panel in fig. 13. referring to fig. 13 and fig. 14, in order to prevent the device failure caused by the corrosion of moisture and oxygen to the light emitting elements in the display layer 30, an encapsulation layer 21 is formed on the side of the display layer 30 away from the flexible substrate 20, and the encapsulation layer 21 covers the predetermined display area AA 1.
Before coating the bending protective agent, the protective film 90 is attached, the protective film 90 includes a second protective film 94, the second protective film 94 includes a first adhesive film 91 and a third adhesive film 95 covering the packaging layer 21, the first adhesive film 91 covers the preset cutting area 80, the third adhesive film 95 covers the preset display area AA1, and the third adhesive film 95 effectively prevents the packaging layer 21 from being scratched in the coating process of the bending protective agent. And the adhesion of the second protective film 94 is less than 5gf/in, that is, the second protective film 94 is a weak adhesion film, before the bending protective agent is coated, only the second protective film 94 needs to be integrally attached, after the bending protective agent is cured to form the bending protective layer 40, the second protective film 94 is integrally torn away, and when the preset cutting area 80 is cut and removed along the first cutting edge 81, the first adhesive film 91 does not need to be removed at the same time, so that the difficulty of the subsequent cutting process is reduced.
Since the encapsulating layer is used for blocking the corrosion of moisture and oxygen to the light emitting element, once the encapsulating layer is damaged, the moisture and oxygen can corrode the light emitting element to cause device failure, and therefore the protective film protects the encapsulating layer at the first time.
Optionally, wherein the first adhesive film covers the first cut edge.
Fig. 15 is a schematic plan view of another middle-segment display panel formed before step S105, referring to fig. 15, the first cutting edge 81 is a boundary between the preset bending region 10a and the preset cutting region 80, the first film 91a covers the first cutting edge 81, due to the existence of the first film 91a, when the bending protective agent is coated, the bending protective agent does not spread to the first cutting edge 81, after the bending protective agent is cured to form the bending protective layer 40, the first film 91a is torn away, the preset cutting region 80 is cut and removed along the first cutting edge 81, when the preset cutting region 80 is cut along the first cutting edge 81, it is ensured that the bending protective layer 40 is not cut, and the occurrence of cutting carbonization marks is effectively avoided.
Optionally, the first adhesive film at least partially covers the preset bending region, and a distance from a part of the first adhesive film covering the preset bending region to the first cutting edge is d2, wherein d2 is greater than or equal to 0 and less than or equal to 200 μm.
With continued reference to FIG. 15, the distance from the portion of the first film 91a covering the predetermined bending region 80 to the first cut edge 81 is d2, wherein d2 is 0 ≦ 200 μm. The distance from any point of the portion of the first film 91a covering the predetermined bending region 80 to the first cutting edge 81 satisfies the above condition, that is, the distance from the portion of the first film 91a covering the predetermined bending region 80 to the first cutting edge 81 is 200 μm at most, so that the distance between the formed bending protection layer 40 and the first cutting edge 81 is 200 μm at most. The bending protection layer 40 is effectively prevented from being cut when the preset cutting area 80 is cut, the difficulty of the cutting process is reduced, and meanwhile, the stress of the circuit wiring at the edge of the preset bending area 10a cannot be influenced when the circuit wiring is bent.
When the preset cutting region 80 is cut and removed along the first cutting edge 81, the first cutting edge 81 is subjected to a large impact, and the stress is concentrated, so that on one hand, the film layer at the position of the first cutting edge 81 is not desired to be thick, and on the other hand, the stress problem at the position close to the first cutting edge 81 is desired to be relieved. Through the embodiment of the invention, the bending protection layer 40 does not cover the preset cutting area 80, namely the bending protection layer 40 is not cut when the preset cutting area 80 is cut along the first cutting edge 81, meanwhile, the range of the bending area covered by the side surface in the bending protection layer is smaller, the plane where the side surface is located is approximately vertical to the plane where the flexible substrate is located, namely, the thickness of the edge of the bending protection layer is more uniform, and the stress is not concentrated on the circuit wiring at the edge of the bending area during bending, so that the stress applied to the circuit wiring in the display layer in the bending area is more uniform.
Fig. 16 is a schematic plan view of a protective film according to an embodiment of the present invention, and referring to fig. 16, the protective film according to the embodiment of the present invention at least includes two first films 91, a second film 93, and a hollow portion 96, the hollow portion 96 and the two first films 91 are both located on the same side of the second film 93, the hollow portion 96 is located between the two first films 91, and the first films 91 and the second film 93 partially surround the hollow portion 96.
Optionally, the protective film has an adhesion of less than 5 gf/in.
The protective film provided by the embodiment of the invention can be used in the manufacturing process of the display panel, the first adhesive film 91 covers the preset cutting area, the second adhesive film 93 covers the preset display area, at least part of the hollow-out part 96 is positioned in the preset bending area, and the bending protective layer can be formed in the display panel by coating the bending protective agent in the hollow-out part 96 formed by semi-surrounding the first adhesive film 91 and the second adhesive film 93.
Fig. 17 is a schematic plan view of another protection film according to an embodiment of the present invention, referring to fig. 17, optionally, an auxiliary film 97 is further included, the auxiliary film 97 is located between two first films 91, and the first film 91, the second film 93 and the auxiliary film 97 surround the hollow portion 96.
With continued reference to fig. 17, the protective film further includes an auxiliary adhesive film 97 located between the two first adhesive films 91, the auxiliary adhesive film 97 at least partially covers the binding region, and the first adhesive film 91, the second adhesive film 93 and the auxiliary adhesive film 97 surround the hollow portion 96, so that the coating range of the bending protective agent is further limited, the bending protective agent is effectively prevented from being coated in the range where the bending protective agent is not required to be coated, the amount of the bending protective agent is reduced, and the production cost is reduced.
An embodiment of the present invention provides a display device, including the display panel 100 as described above.
Referring to fig. 18, fig. 18 is a schematic structural diagram of a display device according to an embodiment of the present invention. Fig. 18 provides a display device 1000 including the display panel 100 according to any of the above embodiments of the present invention. The embodiment of fig. 18 is only an example of a mobile phone, and the display device 1000 is described, but it should be understood that the display device 100 provided in the embodiment of the present invention may be other display devices having a display function, such as a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device provided in the embodiment of the present invention has the beneficial effects of the display panel provided in the embodiment of the present invention, and specific reference may be made to the specific description of the display panel in each of the above embodiments, which is not repeated herein.
As can be seen from the above embodiments, the display panel, the manufacturing method thereof, the protective film, and the display device provided by the present invention at least achieve the following advantages:
in a first cross section of the display panel, the length of a vertical projection of the side surface on the flexible substrate is L, the length of the upper surface and the lower surface in the direction vertical to the display panel is D, wherein L is more than or equal to 0 and less than or equal to D/10, and the first cross section is vertical to the display panel and is vertical to the edge of the cut display panel. The side surfaces of the upper surface and the lower surface are close to and perpendicular to the upper surface and the lower surface, so that the circuit wiring with stress concentrated at the edge of the bending area during bending is effectively avoided, and the stress on the circuit wiring in the display layer in the bending area is uniform.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (11)
1. A method of manufacturing a display panel, the display panel comprising: the display device comprises a display area and a non-display area surrounding the display area, wherein the non-display area comprises a bending area positioned on one side of the display area; the display device comprises a flexible substrate and a display layer positioned on one side of the flexible substrate; the bending protective layer is arranged on one side, far away from the flexible substrate, of the display layer, is positioned in the non-display area, and is at least partially positioned in the bending area; the bending protection layer comprises an upper surface, a lower surface and a side surface connecting the upper surface and the lower surface, the upper surface is the surface of one side of the bending protection layer, which is far away from the flexible substrate, and the lower surface is the surface of one side of the bending protection layer, which is close to the flexible substrate; in at least one first cross section, the length of the vertical projection of the side face on the flexible substrate is L, the length of the upper surface and the lower surface in the direction perpendicular to the display panel is D, wherein L is more than or equal to 0 and less than or equal to D/10, and the first cross section is perpendicular to the display panel and perpendicular to the edge of the cut display panel;
the manufacturing method comprises the following steps:
providing a flexible substrate, wherein the flexible substrate comprises a preset display area and a preset non-display area surrounding the preset display area, the preset non-display area comprises a preset bending area positioned on one side of the preset display area in a second direction, the relative arrangement direction between the preset display area and the preset bending area is taken as the second direction, and the preset cutting areas are positioned on two sides of the preset bending area in a third direction; the second direction and the third direction intersect;
forming a display layer on one side of the flexible substrate;
attaching a protective film to one side of the display layer, which is far away from the flexible substrate, wherein the protective film at least comprises a first adhesive film covering the preset cutting area;
coating a bending protective agent, wherein the bending protective agent covers the preset bending area;
and removing at least the first adhesive film and removing the preset cutting area.
2. The method for manufacturing a display panel according to claim 1,
the first adhesive film has an adhesive force of less than 5 gf/in;
removing the first film and removing the preset cutting area comprises:
tearing the first adhesive film from the display panel, and cutting and removing the preset cutting area along a first cutting edge, wherein the first cutting edge is a junction of the preset bending area and the preset cutting area.
3. The method for manufacturing a display panel according to claim 1,
the protective film comprises a first protective film, and the first protective film comprises a first adhesive film and a second adhesive film covering the preset display area;
removing at least the first adhesive film and removing the preset cutting area comprises:
and simultaneously removing the first adhesive film and the preset cutting area by cutting.
4. The method for manufacturing a display panel according to claim 3,
the first protective film is one or more of a barrier layer or a polarizer.
5. The method for manufacturing a display panel according to claim 4,
the first film is cut off at a first cutting edge, and the first cutting edge is a junction of the preset bending area and the preset cutting area.
6. The method for manufacturing a display panel according to claim 1, further comprising:
after the display layer is formed and before the protective film is attached, forming a packaging layer on one side, far away from the flexible substrate, of the display layer, wherein the packaging layer covers the preset display area;
the attached protective film includes: attaching the protective film to one side, far away from the flexible substrate, of the packaging layer, wherein the protective film comprises a second protective film, and the second protective film comprises the first adhesive film and a third adhesive film covering the packaging layer;
the second protective film has an adhesion of less than 5 gf/in;
removing the first adhesive film and removing the preset cutting area comprises:
tearing the second protective film from the display panel, and cutting and removing the preset cutting area along a first cutting edge, wherein the first cutting edge is a junction of the preset bending area and the preset cutting area.
7. The method for manufacturing a display panel according to claim 2 or 6,
the first film covers the first cut edge.
8. The method for manufacturing a display panel according to claim 7,
the first adhesive film at least partially covers the preset bending area, and the distance from the part of the first adhesive film covering the preset bending area to the first cutting edge is d2, wherein d2 is more than or equal to 0 and less than or equal to 200 mu m.
9. A protective film for use in the method of any one of claims 1-8, comprising at least two first patches, a second patch, and a cutout, the cutout and the two first patches each being located on the same side of the second patch, the cutout being located between the two first patches, and the first patches and the second patches semi-surrounding the cutout.
10. The protective film according to claim 9, further comprising an auxiliary adhesive film, wherein the auxiliary adhesive film is located between the two first adhesive films, and the first adhesive film, the second adhesive film and the auxiliary adhesive film surround the hollow portion.
11. A display device comprising a display panel manufactured by the manufacturing method according to any one of claims 1 to 8.
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