CN107527556B - Flexible display panel, display device and forming method of flexible display panel - Google Patents
Flexible display panel, display device and forming method of flexible display panel Download PDFInfo
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- CN107527556B CN107527556B CN201710769371.XA CN201710769371A CN107527556B CN 107527556 B CN107527556 B CN 107527556B CN 201710769371 A CN201710769371 A CN 201710769371A CN 107527556 B CN107527556 B CN 107527556B
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- 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 present application relates to the field of display technologies, and in particular, to a flexible display panel, a display device, and a method for forming a flexible display panel. The flexible display panel comprises a flexible substrate, the flexible substrate is provided with a display area and a non-display area, the non-display area is provided with a bending part, and the bending part comprises: the signal transmission line layer is stacked with the first covering layer, and at least one groove is formed in one side, at least far away from the signal transmission line layer, of the first covering layer; the second covering layer covers one side, far away from the signal transmission line layer, of the first covering layer, and the groove is filled with the second covering layer. According to the display panel and the manufacturing method thereof, the interface layers of the two adjacent layers form the concave-convex structure, so that the contact area between the first covering layer and the second covering layer is increased, the adhesion force of the first covering layer and the second covering layer is increased, and the reliability of the display panel is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a flexible display panel, a display device and a forming method of the flexible display panel.
Background
With the development of display technology, display panels are widely applied to portable electronic products such as mobile phones and palm computers, and especially, flexible display panels are more and more favored by users with the advantages of being foldable, convenient to carry, wide in application range and the like, and provide brand-new viewing experience for users.
In the related art, the flexible display panel may be unfolded or bent, and has a bent portion where the reliability of the flexible display panel is poor, which may affect the service life of the entire flexible display panel.
Disclosure of Invention
The application provides a flexible display panel, a display device and a forming method of the flexible display panel, which can solve the problems.
A first aspect of the present application provides a flexible display panel, including a flexible substrate, the flexible substrate has a display area and a non-display area, the non-display area has a bending portion, the bending portion includes:
a signal transmission line layer is provided,
a first cover layer, which is formed on the substrate,
a second cover layer is formed on the first cover layer,
the signal transmission line layer and the first covering layer are arranged in a stacked mode, and at least one groove is formed in one side, away from the signal transmission line layer, of the first covering layer; the second covering layer covers one side, far away from the signal transmission line layer, of the first covering layer, and the groove is filled with the second covering layer.
A second aspect of the application provides a display device comprising a flexible display panel as described in any of the above.
A third aspect of the present application provides a method for forming a flexible display panel, including:
providing a flexible substrate, wherein the flexible substrate is provided with a display area and a non-display area, the non-display area is provided with a bending part, and the bending part is formed with:
a signal transmission line layer is provided,
a first cover layer, which is formed on the substrate,
a second cover layer;
the signal transmission line layer and the first covering layer are arranged in a stacked mode, and at least one groove is formed in one side, away from the signal transmission line layer, of the first covering layer; the second covering layer covers one side, far away from the signal transmission line layer, of the first covering layer, and the groove is filled with the second covering layer.
The technical scheme provided by the application can achieve the following beneficial effects:
according to the flexible display panel, the groove is formed in the first covering layer at the bending part, the second covering layer covers the first covering layer and fills the groove, and the interface layers of the two adjacent layers form the concave-convex structure, so that the contact area between the first covering layer and the second covering layer is increased, and the adhesion force of the first covering layer and the second covering layer is increased; meanwhile, the groove is formed, so that stress release of the first covering layer during bending can be facilitated, the influence of stress in all directions on the interface layer is reduced as much as possible, the interface layer is prevented from aging and even falling off, and the reliability of the flexible display panel is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a flexible display panel provided in the present application;
FIG. 2 is a cross-sectional view of one embodiment of a flexible display panel provided herein;
FIG. 3 is a schematic structural diagram of an embodiment of a flexible display panel provided in the present application;
FIG. 4 is a schematic structural diagram of another embodiment of a flexible display panel provided in the present application;
FIG. 5 is a schematic structural diagram of another embodiment of a flexible display panel provided in the present application;
FIG. 6 is a schematic structural diagram of another embodiment of a flexible display panel provided in the present application;
FIG. 7 is a schematic structural diagram of another embodiment of a flexible display panel provided in the present application;
FIG. 8 is a partial view of one embodiment of a first cover layer in a flexible display panel provided herein;
FIG. 9 is a partial view of another embodiment of a first cover layer in a flexible display panel provided in the present application;
FIG. 10 is a partial view of yet another embodiment of a first cover layer in a flexible display panel provided herein;
FIG. 11 is a partial view of yet another embodiment of a first cover layer in a flexible display panel provided herein;
fig. 12 is a flowchart illustrating a method for forming a flexible display panel according to an embodiment of the present disclosure.
Reference numerals:
100-a display area;
200-a non-display area;
20-bending part;
201-signal transmission line layer;
202-a first cover layer;
2021-groove;
2021 a-cell wall;
2021 b-cell bottom;
2022-ridges;
203-a second cover layer;
2031-raised structures;
204-a flexible substrate;
205-a buffer film layer;
206-gate insulating film layer;
207-capacitor insulating film layer;
208-interlayer insulating film layer;
209-passivation film layer;
210-planarizing the film layer;
211-anode electrode film layer;
212-auxiliary adhesive layer.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Detailed Description
The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element.
The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings. The thicknesses and shapes of the respective components in the drawings do not reflect the true scale of the display device, and are merely intended to schematically illustrate the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a flexible display panel provided in the present application.
The embodiment of the application provides a flexible display panel which can be applied to a display device. The flexible display panel includes a flexible substrate, the flexible substrate has a display area 100 and a non-display area 200, the display area 100 may be a rectangular area, a pentagonal area, or a circular area, and the non-display area 200 may be disposed at the periphery of the display area 100 or at one side of the display area 100. The non-display area 200 has a bending portion 20, the bending portion 20 may be located at one side of the display area 100, or may be located at a certain corner of the display area 100, and the flexible display panel can be folded or unfolded at the bending portion 20.
Referring next to fig. 2, fig. 2 is a cross-sectional view of an embodiment of a flexible display panel provided in the present application.
Specifically, the bending portion 20 includes a signal transmission line layer 201, a first cover layer 202 and a second cover layer 203, signal routing is arranged on the signal transmission line layer 201, for example, a source metal line and a drain metal line, the signal transmission line layer 201 and the first cover layer 202 are stacked, at least one groove 2021 is arranged on one side of the first cover layer 202 away from the signal transmission line layer 201, that is, the first cover layer 202 may only be provided with the groove 2021 on one side of the first cover layer 201, and also may be provided with the groove 2021 on both sides of the first cover layer 202 along the thickness direction of the flexible display panel, the groove 2021 on one side of the first cover layer 202 away from the signal transmission line layer 201 may be formed by recessing one side of the first cover layer 202 away from the signal transmission line layer 201 to one side of the signal transmission line layer 201.
The second cover layer 203 covers a side of the first cover layer 202 away from the signal transmission line layer 201, and fills the groove 2021, that is, the signal transmission line layer 201, the first cover layer 202, and the second cover layer 203 are sequentially stacked, and the second cover layer 203 fills the groove 2021.
In the flexible display panel, at the bending portion 20, the first cover layer 202 is provided with the groove 2021, the second cover layer 203 covers the first cover layer 201, and fills the groove 2021, that is, the second cover layer 203 is close to one side of the signal transmission line layer 201 to form the protrusion structure 2031, and the protrusion structure 2031 is filled in the groove 2021 to be attached to the groove 2021, actually, the protrusion structure 2031 is adapted to the groove 2021 and completely attached to the groove 2021, so that the interface layers of the two adjacent layers form the concave-convex structure, the contact area between the first cover layer 202 and the second cover layer 203 is increased, and the attachment force between the first cover layer 202 and the second cover layer 203 is further increased; meanwhile, the first covering layer 202 is provided with the groove 2021, so that stress release of the first covering layer 202 during bending can be facilitated, influence of stress in all directions on the interface layer is reduced as much as possible, the interface layer is prevented from aging and even falling off, and reliability of the flexible display panel is improved.
The second cover layer 203 may be an encapsulation layer, such as a glass encapsulation layer; the second cover layer 203 may also be an organic coating layer, and the material of the second cover layer includes at least one of acrylic acid and polyacrylic acid, that is, the second cover layer 203 may be made of only acrylic acid or polyacrylic acid and other auxiliary materials, or may be made of acrylic acid, polyacrylic acid and other auxiliary materials at the same time, so as to form an organic encapsulation layer, increase the adhesion between the second cover layer 203 and the first cover layer 202, relieve the stress of the encapsulation layer, avoid the generation of cracks as much as possible, and increase the diffusion path of water and oxygen molecules.
With continued reference to figure 2 of the drawings,
the display area 100 may include a flexible substrate 204, a buffer film layer 205, a gate insulating film layer 206, a capacitor insulating film layer 207, an interlayer insulating film layer 208, and a signal transmission line layer 201, and further, between the buffer film layer 205 and the gate insulating film layer 206, the display area 100 further includes a semiconductor film layer, between the gate insulating film layer 206 and the capacitor insulating film layer 207, the display area 100 further includes a gate metal layer, between the capacitor insulating film layer 207 and the interlayer insulating film layer 208, the display area 100 further includes a capacitor metal layer, on a side of the signal transmission line layer 201 away from the flexible substrate 204, the display area 100 further includes a passivation film layer 209, a planarization film layer 210, an anode electrode film layer 211, a pixel defining film layer, and a cathode electrode film layer, and meanwhile, an organic light emitting film layer is disposed between the cathode electrode film layer and the pixel defining film layer.
The flexible substrate 204 is made of a polymer material such as imide (PI), Polycarbonate (PC), Polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polyarylate (PAR), or Fiberglass Reinforced Plastic (FRP), and the flexible substrate 204 may be transparent, translucent, or opaque to support the formation of each film layer.
A buffer film layer 205 is located on the flexible substrate 204, and the buffer film layer 205 covers the entire upper surface of the flexible substrate 204. The buffer film layer 205 includes an inorganic layer or an organic layer. For example, the buffer film layer 205 may be a film formed of a material selected from an inorganic material such as silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SiOxNy), aluminum oxide (AlOx), aluminum nitride (AlNx), or the like, or an organic material such as acryl (acryl), Polyimide (PI), or polyester, or the like. In one embodiment, the buffer film layer 205 is an organic layer, and further, the buffer film layer 205 may have a single-layer or multi-layer structure. The buffer film layer 205 can block the penetration of impurity ions, water oxygen molecules, etc., prevent the diffusion of moisture or impurities through the flexible substrate 204, and minimize the degradation of the organic layer. And can provide a flat surface on the upper surface of the flexible substrate 204.
The semiconductor film layer is provided with a Thin Film Transistor (TFT). The semiconductor film layer includes a source region and a drain region formed by doping N-type impurity ions or P-type impurity ions, and a region between the source region and the drain region is a channel region not doped with impurities. The semiconductor film layer may be formed by changing amorphous silicon into polycrystalline silicon by crystallization of the amorphous silicon.
The gate insulating film layer 206 may be an inorganic layer formed of, for example, silicon oxide, silicon nitride, or metal oxide, and the gate insulating film layer 206 may have a single-layer or multi-layer structure.
A gate metal layer, which may be a single-layer or multi-layer structure formed of gold (Au), silver (Ag), copper (Cu), nickel (Ni), platinum (Pt), palladium (Pd), aluminum (Al), molybdenum (Mo), or chromium (Cr), or a layer structure formed of an alloy such as aluminum (Al) neodymium (Nd) alloy, molybdenum (Mo) tungsten (W) alloy, or the like, is disposed on the gate insulating film layer 206.
The capacitor insulating film 207 may be an inorganic layer, such as a single-layer structure or a mixed-layer structure formed by silicon oxide (SiOx) or silicon nitride (SiNx), disposed between the gate metal layer and the capacitor metal layer, such that a portion of the gate metal layer forms a first capacitor plate and a portion of the capacitor metal layer forms a second capacitor plate, thereby forming a plate capacitor.
The interlayer insulating film 208 is disposed on the capacitor metal layer, and the interlayer insulating film 208 may be formed of an insulating inorganic material such as silicon oxide (SiOx) or silicon nitride (SiNx).
The signal transmission line layer 201 is provided with a source electrode and a drain electrode electrically connected (or bonded) to the source region and the drain region, respectively, through contact holes formed by selectively removing the gate insulating film layer and the interlayer insulating film layer 208. The signal transmission line layer 201 has a single metal layer structure or a multi-layer mixed metal layer structure, and a metal material such as titanium (Ti)/aluminum (Al) has a small resistivity.
The passivation film 209 may be formed of an inorganic layer such as silicon oxide (SiOx) or silicon nitride (SiNx), and in some structures, the passivation film 209 may be eliminated.
The planarization film layer 210 may be an organic layer formed of acryl, Polyimide (PI), benzocyclobutene (BCB), or the like.
The anode electrode film layer 211 may be a mixed conductive layer formed of, for example, Indium Tin Oxide (ITO)/silver (Ag)/transparent conductive film (ITO) or silver (Ag)/transparent conductive film (ITO). When the anode electrode film layer 211 is a reflective electrode film layer, it may be formed of silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), or a mixture thereof, and an indium tin oxide transparent conductive film (ITO), indium-doped zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), or the like may be formed on the reflective film layer.
The pixel defining layer forms each pixel electrode, and may be formed of an organic material such as Polyimide (PI), Polyamide (PA), benzocyclobutene (BCB), acryl resin, or phenol resin.
The organic light emitting film layer may be formed of a low molecular weight organic material or a high molecular weight organic material, and includes an organic emission layer, but may include other various functional layers in addition to the organic emission layer. Such as at least one of a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), an Electron Transport Layer (ETL), and an Electron Injection Layer (EIL).
The cathode electrode film layer is a transparent electrode, and is a film layer formed of a compound such as lithium (Li), calcium (Ca), lithium fluoride/calcium (LiF/Ca), lithium fluoride/aluminum (LiF/Al), aluminum (Al), magnesium (Mg), or a combination thereof.
The first cover layer 202 may have a single-film structure or a multi-film structure, the first cover layer 202 may be disposed in the same layer as at least one of the passivation film 209, the planarization film 210, the anode electrode 211, the pixel definition film and the cathode electrode film of the display area 100, generally, the first cover layer 202 may be disposed in the same layer as at least one of the passivation film 209 and the planarization film 210 of the display area 100, that is, the bending part 20 may include at least one of the passivation film layer 209, the planarization film layer 210, and the anode electrode film layer 211, thus, by arranging the display area 100 and the non-display area 200 in the same layer, the layers in the display area 100 and the non-display area 200 can be formed together, and a special die is not needed to shield the non-display area 200, thereby simplifying the manufacturing process of the whole flexible display panel.
The first cover layer 202 includes, but is not limited to, the following arrangements:
in the first way, the first cover layer 202 only includes the planarization film layer 210, and since the planarization film layer 210 is an organic layer, it has excellent bending resistance, and can protect the signal traces at the bending portion 20 well. In addition, when the second cover layer 203 is also an organic layer, the adhesion between the first cover layer 202 and the second cover layer 203 can be better increased, the first cover layer 202 and the second cover layer 203 can be prevented from cracking at the bending portion 20, and the second cover layer 203 can be prevented from falling off, so that the reliability of the flexible display panel can be improved.
At this time, the first capping layer 202 and the planarization film layer 210 are deposited in the same layer, that is, the first capping layer 202 and the planarization film layer 210 in the display area 100 are formed in one process, which can save the man-hour and simplify the manufacturing process. In this manner, the groove 2021 is disposed on the side of the planarization film layer 210 away from the signal transmission line layer 201.
In the second mode, the first cover layer 202 includes both the passivation film layer 209 and the planarization film layer 210, and for the convenience of the manufacturing process, the passivation film layer 209 and the planarization film layer 210 in the display region can be deposited and formed in the same layer, the passivation film layer 209 is closer to the signal transmission line layer 201 than the planarization film layer 210, and the planarization film layer 210 is an organic layer, so that when the second cover layer is also an organic layer, the adhesion between the first cover layer 202 and the second cover layer 203 can be better increased, the first cover layer 202 and the second cover layer 203 at the bending portion 20 can be prevented from cracking, and the second cover layer 203 can be prevented from falling off, thereby improving the reliability of the flexible display panel.
In this manner, the groove 2021 is disposed on the side of the planarization film layer 210 away from the passivation film layer 209, and the groove 2021 may be disposed only on the planarization film layer 210 or may be connected to the passivation film layer 209, that is, the side of the planarization film layer 210 away from the passivation film layer 209 is recessed toward the side where the signal transmission line layer 201 is located, and is recessed into the passivation film layer 209.
Third, the first capping layer 202 includes only the passivation film layer 209, which may be deposited on the same layer as the passivation film layer 209 of the display area 100.
In this way, the groove 2021 is disposed on a side of the passivation layer 209 away from the signal transmission line layer 201.
In addition, considering that the second cover layer 203 may have various materials, some materials have good adhesion with organic materials, and some materials have good adhesion with metals, in an embodiment of the present application, the bending portion 20 further includes an auxiliary adhesive layer 212, as shown in fig. 6 to 7, fig. 6 is a schematic structural diagram of another embodiment of the flexible display panel provided by the present application, and fig. 7 is a schematic structural diagram of another embodiment of the flexible display panel provided by the present application.
The auxiliary adhesive layer 212 is disposed between the first cover layer 202 and the second cover layer 203, that is, the first cover layer 202 and the second cover layer 203 are adhered together by the auxiliary adhesive layer 212, and particularly when the second cover layer 203 has good adhesion to metal, the auxiliary adhesive layer 212 and the anode electrode film layer 211 may be disposed in the same layer, that is, the auxiliary adhesive layer 212 is a mixed metal layer, and since the adhesion between the auxiliary adhesive layer 212 and the first cover layer 202 and the adhesion between the auxiliary adhesive layer 212 and the second cover layer 203 are both good, the structure can further prevent the first cover layer 202 and the second cover layer 203 from cracking at the bending portion 20, and improve the reliability of the flexible display panel.
Specifically, the auxiliary adhesive layer 212 may be disposed in the following ways:
first, as shown in fig. 6, the auxiliary adhesive layer 212 is disposed in at least one groove 2021, that is, the auxiliary adhesive layer 212 may be disposed in only one groove 2021, or disposed in a plurality of grooves 2021, since the auxiliary adhesive layer 212 is generally formed by deposition, exposure, development and etching processes, generally, each groove 2021 is disposed with the auxiliary adhesive layer 212, so as to increase the contact area between each auxiliary adhesive layer 212 and the second cover layer 203, and increase the reliability of the entire flexible display panel.
In this way, the auxiliary adhesive layer 212 is only disposed in the groove 2021, and the portion of the first cover layer 202 except the groove 2021 is still attached to the second cover layer 203, so that the auxiliary adhesive layer 212 is attached to the first cover layer 202 and the auxiliary adhesive layer 212 at the same time.
In the second mode, as shown in fig. 7, the auxiliary adhesive layer 212 is disposed on the first cover layer 202 except the groove 2021, that is, the auxiliary adhesive layer 212 is disposed on the flat region of the upper surface of the first cover layer 202 except the groove 2021, a part of the second cover layer 203 is attached to the auxiliary adhesive layer 212 on the flat region, and the other part is attached to the first cover layer 202 in the groove 2021, that is, in this mode, the second cover layer 203 is also attached to the first cover layer 202 and the auxiliary adhesive layer 212 at the same time, so that the stress of the second cover layer 203 can be further relieved, and the reliability of the flexible display panel can be improved.
In a third way, the auxiliary adhesive layer 212 is disposed in the groove 2021 and on the first cover layer 202 except the groove 2021, that is, the auxiliary adhesive layer 212 is disposed on both sides of the first cover layer 202 away from the signal transmission line layer 201, and the second cover layer 203 is only attached to the auxiliary adhesive layer 212 and is not in direct contact with the first cover layer 202.
It should be noted that the auxiliary adhesive layer 212 is disposed in the groove 2021, and the auxiliary adhesive layer 212 may be disposed only on the groove bottom 2021b of the groove 2021, or may be disposed on the groove wall 2021a of the groove 2021.
Further, in order to secure the adhesion of the second cover layer 203, the thickness of the auxiliary adhesive layer 212 is smaller than the depth of the groove 2021, i.e., a space d is left between the upper surface of the portion of the auxiliary adhesive layer 212 located in the groove 2021 and the upper surface of the first cover layer 202, as shown in fig. 6. Wherein, the thickness and the depth refer to the dimension in the direction perpendicular to the substrate base plate.
In the above embodiments, one or more grooves 2021 may be provided, generally, the grooves 2021 are provided with a plurality of grooves, such as five, eight, ten, fifteen, and the like, the number of the protrusion structures 2031 is the same as the number of the grooves 2021, and the protrusion structures 2031 are adapted to the grooves 2021, and by providing the plurality of grooves 2021 and the protrusion structures 2031, the contact area between the second cover layer 203 and the first cover layer 202 can be further increased, so as to increase the bonding force between the two, and ensure the reliability of the flexible display panel; and when the flexible display panel is bent, the more grooves 2021 can better buffer the bending deformation, and better ensure the reliability of the flexible display panel.
When a plurality of grooves 2021 are provided, the grooves 2021 may be connected to each other, as shown in fig. 8 to 9, fig. 8 is a partial view of an embodiment of the first cover layer 202 in the flexible display panel provided by the present application; fig. 9 is a partial view of another embodiment of the first cover layer 202 in the flexible display panel provided in the present application, that is, fig. 8 to 9 are schematic views of a projection of the first cover layer 202 along a direction perpendicular to the substrate base plate.
In fig. 8 to 9, a plurality of grooves 2021 are shown, each groove 2021 is communicated with each other and arranged crosswise, that is, a side of the first cover layer 202 away from the signal transmission line layer 201 is provided with a plurality of grooves 2021 arranged crosswise, each groove 2021 may be a strip-shaped groove, and the plurality of strip-shaped grooves are arranged crisscross to each other to form a net-shaped structure.
Specifically, in each of the strip-shaped grooves, a part of the strip-shaped grooves may be perpendicular to another part of the strip-shaped grooves, as shown in fig. 8; or each strip groove comprises three parts which are parallel to each other and are respectively a first part, a second part and a third part, each strip groove of the first part, each strip groove of the second part and each strip groove of the third part are obliquely arranged, and each strip groove of the second part and each strip groove of the third part are correspondingly crossed one by one, as shown in fig. 9.
It is understood that each groove 2021 can be separately disposed, as shown in fig. 10-11, fig. 10 is a partial view of another specific embodiment of the first cover layer 202 in the flexible display panel provided by the present application; fig. 11 is a partial view of a flexible display panel provided in the present application, illustrating a first cover layer 202 according to still another embodiment, and fig. 10 and 11 are schematic views illustrating a projection of the first cover layer 202 along a direction perpendicular to a substrate base plate.
In fig. 10-11, the side of the first cover layer 202 facing the second cover layer 203 is provided with a plurality of mutually staggered ribs 2022, and the groove 2021 is surrounded by at least three ribs 2022, i.e. two adjacent grooves 2021 are separated by the ribs 2022. Ridge 2022 means that the upper surface of ridge 2022 can be flat, i.e. the aforementioned flat region, compared to groove 2021.
The plurality of convex edges 2022 may include longitudinal convex edges and transverse convex edges perpendicular to each other, and form a rectangular groove, as shown in fig. 10; the plurality of convex edges 2022 can also form a triangular groove, a pentagonal groove or other special-shaped grooves.
Referring to fig. 3-5, fig. 3 is a schematic structural diagram of an embodiment of a flexible display panel provided in the present application; FIG. 4 is a schematic structural diagram of another embodiment of a flexible display panel provided in the present application; fig. 5 is a schematic structural diagram of another embodiment of a flexible display panel provided in the present application.
The groove 2021 includes a groove wall 2021a, and the groove wall 2021a may be parallel to the thickness direction of the flexible display panel, that is, the groove wall 2021a is a vertical plane which is parallel to the thickness direction of the flexible display panel, as shown in fig. 3, that is, the opening of the groove 2021 has the same shape as the groove bottom 2021 b.
As shown in fig. 4 to 5, the groove wall 2021a may be inclined with respect to the thickness direction of the flexible display panel, and the shape of the opening of the groove 2021 may be the same as or different from the shape of the groove bottom 2021 b. The groove wall 2021a may include an inclined plane, as shown in fig. 4, the groove 2021 is a trapezoidal groove, and one end of the inclined plane away from the signal transmission line layer 201 is inclined in a direction away from the center of the groove 2021 than the other end; or the groove wall 2021a includes an arc-shaped face, which projects away from the center of the groove 2021 as shown in fig. 5. Obviously, when the groove wall 2021a is disposed obliquely to the thickness direction of the flexible display panel, the contact area between the second cover layer 203 and the first cover layer 202 can be increased, so that the adhesion between the two layers can be improved, and the reliability of the flexible display panel can be ensured.
It should be noted that the groove wall 2021a may also include both an inclined plane and an arc-shaped surface, or at least one of an inclined plane, an arc-shaped surface, and a vertical plane.
When the groove wall 2021a is disposed to be inclined with respect to the thickness direction of the flexible display panel, that is, when the groove wall 2021a includes an inclined plane or an arc-shaped plane, the range of the inclination angle a between the tangent plane of the groove wall 2021a at any position (when the groove wall 2021a is the inclined plane, the plane on which the inclined plane is located) and the flexible substrate is greater than 0 ° and less than or equal to 90 °, however, if the angle a is too large, the flatness of the second cover layer 203 and the reliability of the entire flexible display panel are affected; if the angle a is too small, the dosage of the second cover layer 203 is increased, so in a preferred embodiment, the inclination angle a of the tangent plane at any position of the groove wall 2021a relative to the flexible substrate is 30 ° to 80 °, such as 30 °, 40 °, 50 °, 60 °, 78 °, 80 °, etc.
Table 1 shows the flatness of the second cover layer 203 and the amount of the second cover layer 203 when the angle a takes different values in the test.
TABLE 1
As is apparent from table 1, by comprehensively considering the flatness of the second cover layer 203, the amount of the second cover layer 203, and the reliability of the entire flexible display panel, the performance of the flexible display panel can be balanced in each aspect when the angle a is 30 ° to 80 °, and the reliability of the flexible display panel can be easily ensured.
It should be noted that, in the present application, no matter what manner the first cover layer 202 is, even if the groove 2021 is disposed on the side of the first cover layer 202 away from the signal transmission line layer 201, the first cover layer 202 completely covers the entire signal transmission line layer 201, that is, a gap is left between the groove bottom 2021b of the groove 2021 and the signal transmission line layer 201, so that the first cover layer 202 can prevent the signal line covering the signal transmission line layer 201 from being exposed, prevent the signal transmission line layer 201 of the bending portion 20 from being damaged by external water and oxygen corrosion, and further prevent the signal line from contacting other components or metal, and from generating short circuit and other faults, thereby improving the reliability of the flexible display panel.
As shown in fig. 3, if the depth of the groove 2021 is too large, the material of the second cladding layer 203 filled in the groove 2021 is increased; if the depth of the groove 2021 is too small, the material of the second cover layer 203 filled in the groove 2021 is too small, which reduces the contact area between the first cover layer 202 and the second cover layer 203 and the adhesion between the two, therefore, it is preferable that the depth of the groove 2021 is too small
Where D1 is the maximum depth of the groove 2021 and D2 is the thickness of the first cladding layer 202, as shown in FIG. 3.
Table 2 shows the reliability of the flexible display panel when the maximum depth D1 of the groove 2021 takes different values in the test.
TABLE 2
From Table 2, it is apparent that
The reliability of the flexible display panel is best.
It can be understood that, on the first cover layer 202, if the opening area of the groove 2021 is too large, the material of the second cover layer 203 filled in the groove 2021 is more, and the strength of the first cover layer 202 is weakened, and multiple bending may cause the first cover layer 202 to be broken, thereby reducing the reliability of the flexible display panel; if the opening area of the groove 2021 is too small, the contact area between the second cover layer 203 and the first cover layer 202 is reduced, the adhesion between the two layers is reduced, and the reliability of the flexible display panel is reduced, and the process difficulty is increased when the second cover layer 203 is filled in the groove 2021 because the opening area is too small. In order to avoid the above drawbacks, in a preferred embodiment of the present application,
wherein, S1 is the sum of the opening areas of the grooves 2021, and the opening area is also equal to the area of the projection of the opening of the groove 2021 along the direction perpendicular to the substrate base plate; s2 is the single-sided surface area of the bent portion 20, i.e., S2 is also equal to the area of the projection of the first cover layer 202 along the direction perpendicular to the substrate base plate.
Table 3 shows the reliability of the flexible display panel when the sum S1 of the opening areas of the grooves 2021 takes different values in the test.
TABLE 3
From Table 2, it is apparent that
The reliability of the flexible display panel is best.
It should be noted that the thickness direction of the flexible display panel is perpendicular to the substrate base plate.
The application also provides a display device, which comprises the flexible display panel according to any one of the above embodiments, and the display device can be any electronic equipment with a display function, such as a touch display screen, a mobile phone, a tablet computer, a notebook computer, an electronic paper book or a television.
In addition, the present application further provides a method for forming a flexible display panel according to any of the above embodiments, as shown in fig. 12, the method includes:
s10: providing a flexible substrate, wherein the flexible substrate is provided with a display area and a non-display area, and the non-display area is provided with a bending part;
s20: forming at the bent portion:
the signal transmission line layer 201 is formed,
the first cover layer 202 is formed by a first cover layer,
a second cover layer 203;
the signal transmission line layer 201 and the first cover layer 202 are stacked, and at least one groove 2021 is formed in one side, away from the signal transmission line layer 201, of the first cover layer 202; the second cover layer 203 covers a side of the first cover layer 202 away from the signal transmission line layer 201, and fills the groove 2021.
By adopting the forming method, the contact area between the second covering layer 203 and the first covering layer 202 during forming can be enlarged as much as possible, so that the adhesive force between the second covering layer 203 and the first covering layer 202 is increased, and the reliability of the finally formed whole flexible display panel is improved.
When the folded portion 20 is further provided with the auxiliary adhesive layer 212, the step S20 further includes, between the forming of the first cover layer 202 and the second cover layer 203: an auxiliary adhesive layer 212 is formed on the first cover layer 202.
The specific structures of the first cover layer 202, the second cover layer 203, and the groove 2021 and the beneficial effects of the various structures may refer to the description of the foregoing embodiments, and are not repeated here.
In general, since the organic layer located before the organic light emitting layer forming step in the display area 100 and the non-display area 200 has the characteristics of a photoresist, these film layers are formed by coating, exposure, development, and other processes. The inorganic layer and the metal layer under the organic light emitting layer are formed by Deposition, photoresist coating, exposure, development, etching and photoresist extraction, wherein the inorganic light emitting layer is deposited by a Plasma Enhanced Chemical Vapor Deposition (PECVD) process, and the metal layer is deposited by a Physical Vapor Deposition (PVD) process. And the cathode electrode layer positioned above the organic light-emitting layer is formed by an evaporation process.
Further, a first cover layer 202 is formed, and at least one groove 2021 is disposed on a side of the first cover layer 202 at least far away from the signal transmission line layer 201, specifically:
s201: depositing a base layer on one side of the signal transmission line layer 201;
s202: carrying out exposure process to expose the substrate layer;
s203: developing the base layer to form a groove 2021, thereby forming a first cover layer 202;
further, the depth of the groove 2021 and the inclination angle a of the groove wall 2021a of the groove 2021 can be controlled by controlling parameters of the exposure process.
The groove 2021 is formed by a process of exposure and development, and the accuracy of each dimension of the formed groove 2021 can be improved by controlling each parameter of the exposure process.
In detail, this can be achieved by controlling the total energy value of the exposure in the exposure process, such as the exposure time and the exposure power, wherein the total energy of the specific exposure is determined according to the material properties of the first cap layer 202 and the depth of the groove 2021 and the inclination angle a of the groove wall 2021a thereof.
In some implementations, the first cover layer 202 is formed by exposure and development processes, so when the reticle is disposed, an area of the reticle corresponding to the groove 2021 may be set to be a light transmission area including a non-light transmission portion and a light transmission portion, wherein the light transmission rate of the non-light transmission portion may gradually increase until the non-light transmission portion is communicated to the light transmission portion, it should be noted that an area where the depth of the groove 2021 is the largest corresponds to the light transmission portion, and an inclined plane or an arc surface of the groove wall 2021a corresponds to the non-light transmission portion, so that the forming accuracy of the groove 2021 can be controlled directly by the disposition of the reticle.
It is understood that the depth of the groove 2021 and the inclination angle a of the groove wall 2021a can also be controlled by setting the mask and controlling the exposure energy.
According to the flexible display panel, the display device and the forming method of the flexible display panel, the groove 2021 is formed in the first covering layer 202 at the bending part 20 of the flexible display panel, the second covering layer 203 covers the first covering layer 202, and the groove 2021 is filled, so that the interface layers of two adjacent layers form a concave-convex structure, the contact area between the first covering layer 202 and the second covering layer 203 is increased, and the adhesion force between the first covering layer 202 and the second covering layer 203 is increased; meanwhile, the groove 2021 is formed, so that stress release of the first covering layer 202 during bending can be facilitated, influence of stress in all directions on the interface layer can be reduced as much as possible, the interface layer is prevented from aging and even falling off, and reliability of the flexible display panel is improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. The utility model provides a flexible display panel, includes the flexible substrate, the flexible substrate has display area and non-display area, the non-display area has the kink, its characterized in that, the kink includes:
a signal transmission line layer is provided,
a first cover layer, which is formed on the substrate,
a second cover layer is formed on the first cover layer,
the signal transmission line layer and the first covering layer are arranged in a stacked mode, and at least one groove is formed in one side, away from the signal transmission line layer, of the first covering layer; the second covering layer covers one side, far away from the signal transmission line layer, of the first covering layer and fills the groove;
the display area comprises a planarization film layer and an anode electrode film layer which are sequentially stacked;
the first covering layer and the planarization film layer are formed in a same-layer deposition mode;
further comprising an auxiliary adhesive layer disposed between the first cover layer and the second cover layer; the auxiliary adhesive layer and the anode electrode film layer are arranged on the same layer;
the flexible display panel satisfies:
wherein S1 is the sum of the opening areas of the grooves, and S2 is the single-side surface area of the bent part;
the groove comprises a groove wall, and the groove wall is obliquely arranged relative to the thickness direction of the flexible display panel;
the inclination angle of the tangent plane at any position of the groove wall relative to the flexible substrate is 30-80 degrees.
2. The flexible display panel of claim 1, wherein the material of the second cover layer comprises at least one of acrylic acid and polyacrylic acid.
3. The flexible display panel of claim 1, wherein the auxiliary adhesive layer is disposed within at least one of the grooves;
or
The auxiliary adhesive layer is arranged on the first covering layer except for the groove.
4. The flexible display panel according to any one of claims 1-3,
wherein D1 is the maximum depth of the groove, and D2 is the thickness of the first cover layer.
5. The flexible display panel according to any one of claims 1 to 3, wherein a side of the first cover layer remote from the signal transmission line layer is provided with a plurality of the grooves arranged in a cross.
6. A display device comprising the flexible display panel according to any one of claims 1 to 5.
7. A method for forming a flexible display panel, comprising:
providing a flexible substrate, wherein the flexible substrate is provided with a display area and a non-display area, the non-display area is provided with a bending part, and the bending part is formed with:
a signal transmission line layer is provided,
a first cover layer, which is formed on the substrate,
a second cover layer;
the signal transmission line layer and the first covering layer are arranged in a stacked mode, and at least one groove is formed in one side, away from the signal transmission line layer, of the first covering layer; the second covering layer covers one side, far away from the signal transmission line layer, of the first covering layer and fills the groove;
the display area comprises a planarization film layer and an anode electrode film layer which are sequentially stacked;
the first covering layer and the planarization film layer are formed in a same-layer deposition mode;
further comprising an auxiliary adhesive layer disposed between the first cover layer and the second cover layer; the auxiliary adhesive layer and the anode electrode film layer are arranged on the same layer;
the flexible display panel satisfies:
wherein S1 is the sum of the opening areas of the grooves, and S2 is the single-side surface area of the bent part;
the groove comprises a groove wall, and the groove wall is obliquely arranged relative to the thickness direction of the flexible display panel;
the inclination angle of the tangent plane at any position of the groove wall relative to the flexible substrate is 30-80 degrees.
8. The molding method according to claim 7, wherein a first cover layer is formed, and at least one groove is provided on at least one side of the first cover layer away from the signal transmission line layer, specifically:
depositing a substrate layer on one side of the signal transmission line layer;
performing an exposure process to expose the substrate layer;
developing the base layer to form the groove, thereby forming the first cover layer;
and controlling the depth of the groove and the inclination angle of the groove wall of the groove by controlling the parameters of the exposure process.
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