CN110504295B - Flexible display panel and display device - Google Patents
Flexible display panel and display device Download PDFInfo
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- CN110504295B CN110504295B CN201910818931.5A CN201910818931A CN110504295B CN 110504295 B CN110504295 B CN 110504295B CN 201910818931 A CN201910818931 A CN 201910818931A CN 110504295 B CN110504295 B CN 110504295B
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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
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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
- H10K59/80—Constructional details
- H10K59/88—Dummy elements, i.e. elements having non-functional features
Abstract
The invention discloses a flexible display panel and a display device, wherein the flexible display panel comprises: display area and non-display area, flexible display panel still includes: a flexible substrate; the driving circuit layer, the organic light-emitting diode layer, the packaging structure and the upper protective film are sequentially arranged on the flexible substrate; the non-display region includes a first inorganic layer; the first inorganic layer is formed by extending any one or more inorganic layers in the driving circuit layer and/or the packaging structure to the non-display area; the distance between the edge of the first inorganic layer in the bending area of the flexible display panel and the edge of the flexible substrate is larger than the distance between the edge of the first inorganic layer in the non-bending area and the edge of the flexible substrate; the distance between the edge of the first inorganic layer and the edge of the flexible substrate in the bending region is greater than or equal to the absolute value of the attachment error of the upper protective film. The invention provides a flexible display panel and a display device, and aims to solve the problem that a bending area of the conventional flexible display panel is easy to crack so as to influence the display of the display area.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display panel and a display device.
Background
With the development of the display technology field, the requirements of users on the appearance and the functions of the display panel are higher and higher, and the flexible display panel gradually becomes a mainstream product of the display panel due to the advantages of being deformable and bendable.
But cracks are very easily generated at the edge of the flexible display panel, especially at the edge of the bending region of the flexible display panel, and the cracks may extend along the edge of the flexible display panel to the inside of the flexible display panel.
Disclosure of Invention
The embodiment of the invention provides a flexible display panel and a display device, and aims to solve the problem that a bending area of the conventional flexible display panel is easy to crack when bent, so that the display of the display area is influenced.
In a first aspect, an embodiment of the present invention provides an organic light emitting display panel, including: display area and non-display area, flexible display panel still includes:
a flexible substrate;
a driving circuit layer on the flexible substrate;
an organic light emitting diode layer on the driving circuit layer;
the packaging structure is positioned on the organic light-emitting diode layer;
an upper protective film on the package structure;
wherein the non-display area includes a first inorganic layer; the first inorganic layer is formed by extending any one or more inorganic layers in the driving circuit layer and/or the packaging structure to the non-display area; the flexible display panel further comprises a bending area and a non-bending area; a distance between an edge of the first inorganic layer in the inflection region and an edge of the flexible substrate is greater than a distance between an edge of the first inorganic layer in the non-inflection region and an edge of the flexible substrate; the distance between the edge of the first inorganic layer in the bending area and the edge of the flexible substrate is larger than or equal to the absolute value of the attachment error of the upper protective film.
In a second aspect, embodiments of the present invention provide a display device, including the flexible display panel provided in any embodiment of the present invention.
The flexible display panel comprises a flexible substrate, and a driving circuit layer, an organic light emitting diode layer, a packaging structure and an upper protective film which are sequentially arranged on the flexible substrate, wherein the flexible display panel comprises a display area and a non-display area, the non-display area comprises a first inorganic layer, and the first inorganic layer is formed by extending any one or more inorganic layers in the driving circuit layer and/or the packaging structure to the non-display area. The flexible display panel comprises a bending area and a non-bending area, the distance between a first inorganic layer in the bending area and the edge of the flexible substrate is larger than or equal to the absolute value of the attachment error of the upper protective film, so that in the preparation process of the flexible display panel, even if the position deviation occurs between the upper protective film and the flexible substrate due to the attachment error, the first inorganic layer in the bending area can be covered by the upper protective film, the first inorganic layer is protected, the first inorganic layer is prevented from being broken when the flexible display panel is bent, the distance between the edge of the first inorganic layer in the bending area and the edge of the flexible substrate is larger than the distance between the edge of the first inorganic layer in the non-bending area and the edge of the flexible substrate, and relative to the non-bending area, the width of the first inorganic layer in the bending area is reduced, so that the first inorganic layer in the bending area is effectively protected, the bending resistance of the flexible display panel is improved, the structure is simple to manufacture, and the preparation efficiency of the flexible display panel can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a flexible display panel in the prior art;
fig. 2 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention;
fig. 3 is a schematic plan view of a flexible display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another flexible display panel provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of the flexible display panel in fig. 3 in a bent state;
fig. 6 is a schematic partial structural diagram of a flexible display panel according to an embodiment of the present invention;
fig. 7 is a schematic partial structure diagram of another flexible display panel provided in an embodiment of the present invention;
fig. 8 is a schematic plan view of a flexible display panel according to another embodiment of the present invention;
fig. 9 is a schematic partial structure diagram of another flexible display panel provided in an embodiment of the present invention;
fig. 10 is a schematic partial structure diagram of another flexible display panel provided in an embodiment of the present invention;
fig. 11 is a schematic partial structure diagram of another flexible display panel provided in an embodiment of the present invention;
fig. 12 is a schematic partial structure diagram of another flexible display panel according to an embodiment of the present invention;
fig. 13 is a schematic partial structure diagram of another flexible display panel according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the prior art, the edge of the flexible display panel is easy to crack, and the inventor finds that the crack generated by the flexible display panel is related to the fact that the upper protective film does not cover the inorganic layer in the bending area. In general, in order to protect the flexible display panel, a protective film is generally attached to the display side of the flexible display panel. The upper protective film can support and protect each layer structure in the flexible display panel. However, in the process of attaching the upper protective film, the accuracy of attaching the film is not high enough. For example, when the protective film is attached, the attachment position of the protective film is shifted to some extent, so that the inorganic layer at the edge of the flexible display panel is not covered with the protective film, and the inorganic layer is cracked when the flexible display panel is bent. Exemplarily, fig. 1 is a schematic structural diagram of a flexible display panel in the prior art, and referring to fig. 1, the flexible display panel includes a flexible substrate 11 and an inorganic layer 12 disposed on the flexible substrate 11 and extending from a display area a to a non-display area B of the flexible substrate 11. In order to protect the flexible display panel, a protective film 13 needs to be attached on the upper side of the inorganic layer 12. Since the upper protection film 13 has a problem of the attachment accuracy, as shown in fig. 1, an attachment error d1 may exist between the upper protection film 13 and the flexible substrate 11, so that the edge of the upper protection film 13 is offset to the setting area of the inorganic layer 12 in the non-display area B, when bending, a part of the structure of the inorganic layer 12 is exposed, and the inorganic layer 12 is subjected to a bending stress to be broken, which easily causes the inorganic layer 12 to crack and extend into the flexible display panel, causing the metal of the driving circuit of the flexible display panel to break, thereby affecting the display effect of the display area a.
In order to solve the above problem, an embodiment of the present invention provides a flexible display panel, including a display area and a non-display area, the flexible display panel further including:
a flexible substrate;
a driving circuit layer on the flexible substrate;
an organic light emitting diode layer on the driving circuit layer;
the packaging structure is positioned on the organic light-emitting diode layer;
an upper protective film on the package structure;
wherein the non-display area includes a first inorganic layer; the first inorganic layer is formed by extending any one or more inorganic layers in the driving circuit layer and/or the packaging structure to the non-display area; the flexible display panel further comprises a bending area and a non-bending area; the distance between the edge of the first inorganic layer in the bending region and the edge of the flexible substrate is greater than the distance between the edge of the first inorganic layer in the non-bending region and the edge of the flexible substrate; the distance between the edge of the first inorganic layer and the edge of the flexible substrate in the bending region is greater than or equal to the absolute value of the attachment error of the upper protective film.
The flexible display panel comprises a flexible substrate, and a driving circuit layer, an organic light emitting diode layer, a packaging structure and an upper protective film which are sequentially arranged on the flexible substrate, wherein the flexible display panel comprises a display area and a non-display area, the non-display area comprises a first inorganic layer, and the first inorganic layer is formed by extending any one or more inorganic layers in the driving circuit layer and/or the packaging structure to the non-display area. The flexible display panel comprises a bending area and a non-bending area, the distance between a first inorganic layer in the bending area and the edge of the flexible substrate is larger than or equal to the absolute value of the attachment error of the upper protective film, so that in the preparation process of the flexible display panel, even if the position deviation occurs between the upper protective film and the flexible substrate due to the attachment error, the first inorganic layer in the bending area can be covered by the upper protective film, the first inorganic layer is protected, the first inorganic layer is prevented from being broken when the flexible display panel is bent, the distance between the edge of the first inorganic layer in the bending area and the edge of the flexible substrate is larger than the distance between the edge of the first inorganic layer in the non-bending area and the edge of the flexible substrate, and relative to the non-bending area, the width of the first inorganic layer in the bending area is reduced, so that the first inorganic layer in the bending area is effectively protected, the bending resistance of the flexible display panel is improved, the structure is simple to manufacture, and the preparation efficiency of the flexible display panel can be improved.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 2 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention, and fig. 3 is a schematic structural diagram of a plane of the flexible display panel according to the embodiment of the present invention, as shown in fig. 2, the flexible display panel includes a flexible substrate 11, a driving circuit layer 14 located on one side of the flexible substrate 11, and an organic light emitting diode layer 15 located on one side of the driving circuit layer 14 away from the flexible substrate 11. In this embodiment, the flexible substrate 11 is stretchable, foldable, bendable, or rollable, so that the flexible organic light emitting display panel is also stretchable, foldable, bendable, or rollable. The flexible substrate 11 may be formed of any suitable insulating material that is flexible. For example, the flexible substrate 11 may be formed of a polymer material such as Polyimide (PI), Polycarbonate (PC), Polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polyarylate (PAR), or glass Fiber Reinforced Plastic (FRP), and may be transparent, translucent, or opaque. The flexible substrate 11 may block diffusion of water, oxygen or other impurities through the flexible substrate 11 into the flexible display panel, and the upper surface of the flexible substrate 11 provides a planar surface for the driving circuit layer 14. The organic light emitting diode layer 15 includes light emitting units arranged in an array, and the driving circuit layer 14 includes driving circuits arranged in an array and corresponding to the light emitting units one to one, and the driving circuits are configured to drive the corresponding light emitting units to emit light, so as to perform image display. One side of the organic light emitting diode layer 15, which is far away from the flexible substrate 11, is further provided with a packaging structure 16 for protecting the organic light emitting diode layer 15, preventing water oxygen or other impurities from invading the organic light emitting diode layer 15, and prolonging the service life of the flexible display panel. The flexible display panel includes a display area a and a non-display area B, the display area a includes a driving circuit and a light emitting unit, and the non-display area B generally includes a peripheral circuit, a peripheral trace, a fan-out area, and the like (located in an area not shown in fig. 2) of the driving circuit for assisting the driving circuit to operate. In general, as shown in fig. 3, the non-display area B is disposed around the display area a. Referring to fig. 2 and 3, the non-display region B further includes a first inorganic layer 17, the first inorganic layer 17 being formed by any one or more inorganic layers in the driving circuit layer 14 extending to the non-display region B; alternatively, the first inorganic layer 17 is formed by extending any one or more inorganic layers in the encapsulation structure 16 to the non-display region B; alternatively, the first inorganic layer 17 is formed by extending any one or more inorganic layers of the driving circuit layer 14 and the encapsulation structure 16 to the non-display region B. The present embodiment does not limit the specific film layer and the disposing process of the first inorganic layer 17.
Optionally, with continued reference to fig. 2, the driving circuit layer 14 may include: a buffer layer 141 on the flexible substrate 11; an active layer 142 on the buffer layer 141; a gate insulating layer 143 on the active layer 142; a gate electrode 144 on the gate insulating layer 143; an interlayer insulating layer 145 on the gate electrode 144; a source electrode 146 and a drain electrode 147 on the interlayer insulating layer 145; and a passivation layer 148 on the source and drain electrodes 146 and 147; the first inorganic layer 17 of the non-display region B includes any one layer or a combination of layers of the buffer layer 141, the gate insulating layer 143, the interlayer insulating layer 145, the passivation layer 148, and the inorganic encapsulation layer in the encapsulation structure 16.
The buffer layer 141 may cover the entire upper surface of the flexible substrate 11. For example, the buffer layer 141 may be formed of a material selected from an inorganic material such as silicon oxide (SiOx), silicon nitride (SiNx), silicon oxynitride (SioxNy), aluminum oxide (AlOx), or aluminum nitride (AlNx), or a material selected from an organic material such as acryl, Polyimide (PI), or polyester. The buffer layer 141 may include a single layer or a plurality of layers. The buffer layer 141 may block diffusion of impurities in the flexible substrate 11 to other film layers. The active layer 142 includes source and drain regions formed by doping N-type impurity ions or P-type impurity ions. The region between the source region and the drain region is the channel region. The active layer 142 may be an amorphous silicon material, a polysilicon material, a metal oxide material, or the like. When the active layer 142 is made of a polysilicon material, a low-temperature amorphous silicon technique may be used, that is, the amorphous silicon material is melted by the laser to form a polysilicon material. In addition, it may be formed using various methods such as a Rapid Thermal Annealing (RTA) method, a Solid Phase Crystallization (SPC) method, an Excimer Laser Annealing (ELA) method, a Metal Induced Crystallization (MIC) method, a Metal Induced Lateral Crystallization (MILC) method, or a Sequential Lateral Solidification (SLS) method. The gate insulating layer 143 includes an inorganic layer such as silicon oxide, silicon nitride, and may include a single layer or a plurality of layers. The gate electrode 144 is positioned on the gate insulating layer 143. The gate electrode 144 may include a single layer or a plurality of layers of gold (Au), silver (Ag), copper (Cu), nickel (Ni), platinum (Pt), palladium (Pd), aluminum (Al), Molybdenum (MO), or chromium (Cr), or a material such as aluminum (Al): neodymium (Nd) alloy and Molybdenum (MO) alloy, tungsten (W) alloy. An interlayer insulating layer 124 is positioned on the gate electrode 123. The interlayer insulating layer 145 may be formed of an insulating inorganic layer of silicon oxide, silicon nitride, or the like. Alternatively, the interlayer insulating layer 145 may be formed of an insulating organic layer. The source electrode 146 and the drain electrode 147 are positioned on the interlayer insulating layer 145. The source electrode 146 is electrically connected to a source region of the active layer 142 through a contact hole penetrating the gate insulating layer 143 and the interlayer insulating layer 145, and the drain electrode 147 is electrically connected to a drain region of the active layer 142 through a contact hole penetrating the gate insulating layer 143 and the interlayer insulating layer 145. A passivation layer 148 is on the source and drain electrodes 146 and 147. The passivation layer 148 may be formed of an inorganic layer of silicon oxide, silicon nitride, or the like, or an organic layer. Illustratively, the driving circuit layer 14 may further include a planarization layer (not shown in fig. 2) on the passivation layer 148. The planarization layer includes an organic layer of acryl, Polyimide (PI), benzocyclobutene (BCB), or the like, and has a planarization effect.
The organic light emitting diode layer 15 may generally include a pixel defining layer, a first electrode, a light emitting function layer, and a second electrode. The encapsulation structure 16 includes at least one inorganic encapsulation layer and at least one organic encapsulation layer, and the inorganic encapsulation layer and the organic encapsulation layer are sequentially stacked. Illustratively, the encapsulation structure 14 may include, in order in a direction away from the flexible substrate 11, an inorganic encapsulation layer, an organic encapsulation layer, and an inorganic encapsulation layer; alternatively, the encapsulation structure 14 may further include an inorganic encapsulation layer, an organic encapsulation layer, and an inorganic encapsulation layer in sequence along a direction away from the flexible substrate 11, which is not particularly limited in this embodiment of the present invention. The first inorganic layer 17 of the non-display region B may include any one layer or a combination of multiple layers of the buffer layer 141, the gate insulating layer 143, the interlayer insulating layer 145, the passivation layer 148, and the inorganic encapsulation layer in the encapsulation structure 16. As shown in fig. 4, fig. 4 is a schematic structural diagram of another flexible display panel according to an embodiment of the present invention, the first inorganic layer 17 shown in fig. 4 is a stacked structure formed by a buffer layer 141, a gate insulating layer 143, an interlayer insulating layer 145, and a passivation layer 148, and each inorganic layer of the first inorganic layer 17 and each inorganic film structure in the display area a are disposed in the same layer, so that the process is saved and the manufacturing is simple.
With continued reference to fig. 2 and fig. 3, a side of the package structure 16 away from the flexible substrate 11 is further provided with an upper protection film 13, and the upper protection film 13 is used for protecting the film layer structures, such as the package structure 16 and the organic light emitting diode layer 15, which are located below the upper protection film 13. As shown in fig. 3, the flexible display panel further includes a bending region W1 and a non-bending region W2, and it is noted that fig. 3 only shows the structure of the first inorganic layer 17 in the non-display region B, and the first inorganic layer 17 is a film layer extending from the driving circuit layer and/or the package structure in the display region a, that is, the first inorganic layer 17 is continuously disposed in both the display region a and the non-display region B, but for convenience of describing the structure and shape of the first inorganic layer 17 in the non-display region B, a structural layer continuously disposed with the first inorganic layer 17 in the display region a is not shown in fig. 3, but the first inorganic layer 17 in the non-display region B is simply illustrated separately. The upper protective film 13 can change the neutral plane of the whole flexible display panel, so that the neutral plane is located at the position of the first inorganic layer 17 of the flexible display panel, when an attachment error occurs on the upper protective film 13, the first inorganic layer 17 is probably not covered by the upper protective film 13, the neutral plane of the flexible display panel is not on the first inorganic layer 17, and the first inorganic layer 17 is subjected to stress and breaks in the bending process. It should be noted that the neutral plane of the flexible organic light emitting display panel is a plane with the smallest stress, and the closer to the neutral plane of the flexible organic light emitting display panel, the smaller the stress, the higher the material hardness of the inorganic structure compared with the organic structure, and the easier stress concentration, etc. are, therefore, in order to ensure the bending effect, the neutral plane of the flexible organic light emitting display panel should be ensured to be located near the inorganic structure as much as possible when the flexible organic light emitting display panel is manufactured. Specifically, the present embodiment can adjust the position of the neutral plane of the flexible display panel by adjusting the thickness and hardness of the upper protective film 13.
In this embodiment, in order to prevent the stress concentration from being generated on the first inorganic layer 17 disposed in the non-display region B during the bending process of the bending region W1, the distance d2 between the edge of the first inorganic layer 17 and the edge of the flexible substrate 11 in the bending region W1 may be controlled to be greater than or equal to the absolute value of the attachment error of the upper protection film 13. Within the attaching error, the vertical projection of the first inorganic layer 17 of the bending region W1 on the flexible substrate 11 can be completely covered by the vertical projection of the upper protective film 13 on the flexible substrate 11, so that the upper protective film 13 protects the first inorganic layer 17, the first inorganic layer 17 is prevented from being broken in the bending process, the metal wire in the peripheral circuit of the driving circuit is prevented from being broken due to the breakage of the first inorganic layer 17, and the display effect of the flexible display panel is ensured.
Alternatively, the absolute value of the attachment error is less than or equal to 100 μm, and the attachment error of the upper protective film 13 can be generally controlled within ± 100 μm, so that the distance d2 between the first inorganic layer 17 in the bending region W1 and the edge of the flexible substrate 11 is controlled to be greater than or equal to 100 μm, so that the vertical projection of the upper protective film 13 on the flexible substrate 11 can completely cover the vertical projection of the first inorganic layer 17 in the bending region W1 on the flexible substrate 11, and the first inorganic layer 17 is prevented from being broken.
For the first inorganic layer 17 in the non-bending region W2, the distance d3 between the edge of the first inorganic layer 17 and the edge of the flexible substrate 11 is preferably set to be small. Because the first inorganic layer 17 is directly in contact with the flexible substrate 11 in the non-display area B, and the first inorganic layer 17 has a certain hardness, the flexible substrate 11 can be supported, and the closer the edge of the first inorganic layer 17 is to the edge of the flexible substrate 11, the stronger the first inorganic layer 17 supports the flexible substrate 11, which effectively prevents the edge of the flexible substrate 11 from warping or curling. Illustratively, in the manufacturing process of the flexible display panel, when the flexible display panel needs to be removed from the glass carrier, the flexible substrate 11 is usually required to be torn away from the glass carrier, the first inorganic layer 17 can prevent the edge of the flexible substrate 11 from tilting, and optionally, the first inorganic layer 17 of the non-bending region W2 can extend to the edge of the flexible substrate 11 to further enhance the supporting effect of the first inorganic layer 17 of the non-bending region W2 on the flexible substrate 11. In this embodiment, the edge of the first inorganic layer 17 in the non-bending region W2 is more protruded relative to the edge of the first inorganic layer 17 in the bending region W1, so as to support the flexible substrate 11, while the edge of the first inorganic layer 17 in the bending region W1 is recessed relative to the edge of the first inorganic layer 17 in the non-bending region W2, and the recessed first inorganic layer 17 can release the stress generated by the bending tendency of the flexible substrate 11, so as to enhance the protection effect on the first inorganic layer 17.
In this embodiment, with reference to fig. 3, a distance d2 between an edge of the first inorganic layer 17 in the bending region W1 and an edge of the flexible substrate 11 may be greater than a distance d3 between an edge of the first inorganic layer 17 in the non-bending region W2 and an edge of the flexible substrate 11, so as to effectively protect the first inorganic layer 17 in the bending region W1, ensure that the upper protective film covers the first inorganic layer 17 in the bending region W1, and prevent the first inorganic layer 17 in the bending region W1 from being broken due to stress concentration, while the non-bending region W2 does not need to be bent and is not broken due to bending stress. On the basis of the film structure of the existing first inorganic layer 17, compared with the non-bending region, the present embodiment reduces the size of the first inorganic layer 17 in the direction along the bending axis O of the bending region W1, and ensures that the value of the distance d2 between the first inorganic layer 17 and the edge of the flexible substrate 11 is greater than or equal to the absolute value of the attachment error, so that the setting is simple, the manufacturing process of the flexible display panel is saved, and the first inorganic layer 17 can be prevented from being broken.
Optionally, with continued reference to fig. 4, the flexible display panel may further include a lower protective film 18, where the upper protective film 13 and the lower protective film 18 are oppositely disposed to jointly protect the film structures such as the driving circuit layer 14 and the organic light emitting diode layer 15. Alternatively, as shown in fig. 4, the lower protective film 18 may be provided to have the same size as the flexible substrate 11 to prevent the flexible substrate 11 from being lifted up to support the flexible substrate 11. Optionally, in this embodiment, both the upper protection film 13 and the lower protection film 18 may include structures such as a polarizer, and in addition, the upper protection film 13 and the lower protection film 18 may further include other organic material layers, which is not limited in this embodiment.
With reference to fig. 3, optionally, the non-bending regions W2 of the flexible display panel may be disposed on two opposite sides of the bending region W1, and the embodiment is schematically illustrated by the non-bending regions W2 disposed on two opposite sides of the bending region W1. Referring to fig. 5, fig. 5 is a schematic structural view of the flexible display panel in fig. 3 in a bent state, and then two non-bending regions W2 can be flipped and folded around a bending axis O of the bending region W1. Of course, in this embodiment, the flexible display panel may further include a plurality of non-bending regions W2 and a plurality of bending regions W1, where the non-bending regions W2 and the bending regions W1 are disposed at intervals to form a flexible display panel that can be folded many times, and in this example, the number of the non-bending regions W2 and the bending regions W1 and the relative position relationship are not limited, so that a user can turn over the foldable flexible display panel to form a plurality of forms during use, and the user's requirements are met. For example, the angle between two non-bending areas W2 may be set to 90 degrees, where one non-bending area W2 is used for screen browsing, and the other non-bending area W2 is used for touch input by a user, so as to facilitate the user. And moreover, the foldable flexible display panel can be folded for storage, so that the storage space is saved.
Alternatively, with continued reference to fig. 3, the opposite sides of the first inorganic layer 17 in the bending region W1 may be respectively provided with notches 171 in a direction parallel to the bending axis O of the bending region W1. The perpendicular projection of the notch 171 on the flexible substrate 11 is embodied as: the notch 171 extends from the edge of the first inorganic layer 17 to a side of the first inorganic layer 17 close to the display area a. The notch 171 is arranged in the bending area W1, so that the distance d2 between the edge of the first inorganic layer 17 in the bending area W1 and the edge of the flexible substrate 11 is further increased, the coverage of the upper protective film on the first inorganic layer 17 in the bending area W1 is ensured, the neutral surface of the bending area W1 is controlled to be located at the position of the first inorganic layer 17, the stress concentration of the first inorganic layer 17 is prevented, the first inorganic layer 17 in the bending area W1 is effectively protected, the breakage of the first inorganic layer 17 of the flexible display panel is prevented, and the bending resistance of the flexible display panel is enhanced.
Alternatively, with continued reference to FIGS. 3 and 5, the length of indentation 171 in a direction perpendicular to bending axis O of bending region W1 may be greater than or equal to π R; wherein R is the radius of curvature of the inflection region W1. As can be seen from fig. 5, the length of bending region W1 in the direction perpendicular to bending axis O is generally greater than or equal to pi R, where R is the radius of curvature of bending region W1, i.e. the length of bending region W1 in the direction perpendicular to bending axis O needs to satisfy at least half of the circumference of a circle with radius R, so that bending region W1 can form any angle of bending. To prevent fracture of the first inorganic layer 17 during bending, the length of the notch 171 in the direction perpendicular to the bending axis O may also be greater than or equal to pi R, as shown in fig. 3, which shows the case where the length of the notch 171 in the direction perpendicular to the bending axis O is equal to pi R in fig. 3. Referring to fig. 6, fig. 6 is a partial structural schematic view of a flexible display panel according to an embodiment of the present invention, and fig. 6 illustrates a case where the length of the notch 171 in a direction perpendicular to the bending axis O is greater than pi R, and the notch 171 shown in fig. 6 can ensure that the first inorganic layer 17 of the bending region W1 is covered by the upper protective film, so as to prevent the first inorganic layer 17 from being broken.
Alternatively, with continued reference to FIG. 6, notch 171 can cover bend region W1, and the edge of bend region W1 adjacent to non-bend region W2, in a direction perpendicular to bend axis O of bend region W1. In a direction perpendicular to bending axis O of bending region W1, notch 171 covers bending region W1 and extends to edges L1 and L2 of bending region W1 adjacent to non-bending region W2. In this embodiment, the first inorganic layer 17 between the bending region W1 and the non-bending region W2 can also be completely covered by the upper protective film, so as to ensure that the first inorganic layer 17 in the contact region between the bending region W1 and the non-bending region W2 is located on the neutral plane, prevent the stress concentration of the first inorganic layer 17 at the junction between the bending region W1 and the non-bending region W2, and improve the production yield and the service life of the flexible display panel.
Alternatively, with continued reference to FIG. 6, the width d4 of the gap 171 can be 5 μm to 150 μm in a direction parallel to the bending axis O of the bending zone W1. When the width d4 of the notch 171 is within this range, it is favorable for the upper protective film to completely cover the first inorganic layer 17 of the bending region W1 with respect to the non-bending region W2, so as to effectively prevent the stress concentration of the first inorganic layer 17, and the notch 171 has a simple process and is easy to manufacture. In the present embodiment, the distance d3 between the edge of the non-bending region W2 and the edge of the flexible substrate 11 may also be set to be less than or equal to 100 μm. The vertical projection of the upper protective film on the flexible substrate 11 completely covers the vertical projection of the first inorganic layer 17 in the bending region W1 and the non-bending region W2 on the flexible substrate 11, so that the strength of the whole flexible display panel is further enhanced, the first inorganic layer 17 is prevented from generating cracks, the integrity of metal lines in the flexible display panel is ensured, and the display effect of the display region is improved. In addition, the distance d2 between the edge of the bending region W1 and the edge of the flexible substrate 11 can reach 105 μm to 250 μm, thereby further preventing the bending stress from affecting the first inorganic layer 17 of the bending region W1.
Alternatively, referring to fig. 7, fig. 7 is a partial structural schematic view of another flexible display panel provided in the embodiment of the present invention, and an edge of the notch 171 may be an arc. The graph transition of curved edge is more gentle, can not have sharp-edged stress concentration's problem, and is exemplary, breach 171 that fig. 7 shows is rounded rectangle, and curved edge can the homodisperse stress, and for right angle or other acute angles, curved turning is difficult for taking place the problem of stress concentration for even when the atress, also can the homodisperse stress of first inorganic layer 17, improves the structural strength at first inorganic layer 17 edge.
Fig. 8 is a schematic plan structure view of another flexible display panel provided in an embodiment of the present invention, fig. 9 is a schematic partial structure view of another flexible display panel provided in an embodiment of the present invention, and optionally, the first inorganic layer 17 may include a central region 17b and an edge region 17a surrounding the central region 17 b; the first inorganic layer 17 of the edge region 17a includes at least one slit 172; the slit 172 penetrates the first inorganic layer 17 in a direction perpendicular to the flexible substrate 11.
In the actual production process of the flexible display panel, a master mask comprising a plurality of flexible display panels needs to be cut and divided to form each flexible display panel, cutting lines are edges of each flexible display panel, cracks can be easily generated on some film layers of the flexible display template in the cutting process, and the cracks can extend into the flexible display panel, so that metal lines inside the flexible display panel are broken. The present embodiment may divide the first inorganic layer 17 into a central region 17b and an edge region 17a surrounding the central region 17b, and provide at least one slit 172 extending along the edge of the flexible substrate 11 at the edge region 17a such that the slit 172 interrupts the extension of the crack. The slit 172 penetrates the first inorganic layer 17 in the thickness direction. Specifically, referring to fig. 9, the edge region 17a of the first inorganic layer 17 is patterned to form a plurality of slits 172 extending along the edge of the flexible substrate 11, the slits 172 are separated by raised structures 173 formed by the first inorganic layer 17, the raised structures 173 also extend along the edge of the flexible substrate 11, and the slits 172 and the raised structures 173 are alternately arranged in a direction from the display region toward the edge of the flexible substrate 11. The present embodiment may be provided with a plurality of slits 172 and a plurality of protrusion structures 173 to further enhance the cutting crack blocking effect.
Referring to fig. 8, alternatively, the slit 172 and the protrusion 173 are ring-shaped structures surrounding the display area a in the plane of the whole flexible display panel. The slits 172 and the protruding structures 173 surround the package structure and the retaining wall structures (not shown in fig. 8) disposed at the edges of the package structure, so as to protect the package structure from water and oxygen intrusion into the flexible display panel due to cracks generated in the package structure. Optionally, in this embodiment, the edge region 17a of the first inorganic layer 17 of the bending region W1 can also be completely covered by the upper protection film, so as to prevent the bending stress generated by the bending region W1 from damaging the slits 172 and the plurality of protruding structures 173, and effectively prevent cracks generated by the bending stress. It is noted that the notch 171 provided at the edge of the first inorganic layer 17 is disposed at the edge region 17a and is formed by cutting off the portion of the protruding structure 173.
Alternatively, the shape of the notch 171 in the plane of the flexible display panel may be at least one of a rectangle, a circle, a semicircle, a truncated circle, a U-shape, and a trapezoid. Referring to fig. 9, fig. 9 shows a case where the notch 171 is rectangular, fig. 10 is a schematic partial structure diagram of another flexible display panel according to an embodiment of the present invention, fig. 10 shows a case where the notch 171 is semicircular, fig. 11 is a schematic partial structure diagram of another flexible display panel according to an embodiment of the present invention, fig. 11 shows a case where the notch 171 is circular, in this embodiment, when the circular shape is divided into two different parts by a straight line, the shape of one part of the circular shape and the same semicircular shape are gradually changed into an arc shape, the transition is gradual, stress concentration is not easily generated, fracture of the first inorganic layer 17 of the notch 171 is effectively prevented, and bending resistance of the flexible display panel is improved. Fig. 12 is a partial structural schematic view of another flexible display panel according to an embodiment of the present invention, fig. 12 illustrates a case where the notch 171 is U-shaped, fig. 13 is a partial structural schematic view of another flexible display panel according to an embodiment of the present invention, and fig. 13 illustrates a case where the notch 171 is trapezoidal. Referring to fig. 9 to 13, which respectively show notches 171 of different shapes, the notches 171 in the present embodiment may include at least one of the above-described shapes, which are simple in structure and easy to manufacture, and can improve the manufacturing efficiency of the flexible display panel. The notch 171 may have other regular or irregular shapes, and the specific shape of the notch 171 is not limited in this embodiment.
Alternatively, the distance d2 between the edge of the notch 171 and the edge of the flexible substrate 11 in the direction perpendicular to the bending axis O of the bending region may gradually increase and then gradually decrease. In this embodiment, the distance d2 between the edge of the notch 171 and the edge of the flexible substrate 11 is not a fixed value, but is first gradually increased, and then gradually decreases, the edge of the notch 171 is an arc-like edge, so that the first inorganic layer 17 can effectively disperse the stress, exemplarily, as shown in fig. 11, with the bending axis O as the center, the distance d2 between the edge of the notch 171 and the edge of the flexible substrate 11 gradually increases from the edge L1 of the bending region W1 to the bending axis O, and the distance d2 between the edge of the notch 171 and the edge of the flexible substrate 11 gradually decreases from the bending axis O to the edge L2 of the bending region W1, so that the gradual change of the distance d2 between the edge of the notch 171 and the edge of the flexible substrate 11 is realized, the bending resistance of the notch 171 is improved, the stress concentration at the edge of the notch 171 is avoided, and the structural strength of the first inorganic layer 17 of the bending region W1 is improved.
The embodiment of the invention also provides a display device. Fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 14, a display device 2 according to an embodiment of the present invention includes the flexible display panel 1 according to any embodiment of the present invention. The display device 2 may be a foldable mobile phone as shown in fig. 14, or may be a computer, a television, an intelligent wearable device, and the like, which is not particularly limited in this embodiment.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (14)
1. A flexible display panel comprising a display region and a non-display region, the flexible display panel further comprising:
a flexible substrate;
a driving circuit layer on the flexible substrate;
an organic light emitting diode layer on the driving circuit layer;
the packaging structure is positioned on the organic light-emitting diode layer;
an upper protective film on the package structure;
wherein the non-display area includes a first inorganic layer; the first inorganic layer is formed by extending any one or more inorganic layers in the driving circuit layer and/or the packaging structure to the non-display area; the flexible display panel further comprises a bending area and a non-bending area; a distance between an edge of the first inorganic layer in the inflection region and an edge of the flexible substrate is greater than a distance between an edge of the first inorganic layer in the non-inflection region and an edge of the flexible substrate; the distance between the edge of the first inorganic layer in the bending area and the edge of the flexible substrate is larger than or equal to the absolute value of the attachment error of the upper protective film;
the perpendicular projection of the protective film on the bending area on the flexible substrate completely covers the perpendicular projection of the first inorganic layer of the bending area on the flexible substrate.
2. The flexible display panel of claim 1,
the absolute value of the attachment error is less than or equal to 100 μm.
3. The flexible display panel of claim 1,
the perpendicular projection of the upper protective film on the flexible substrate completely covers the perpendicular projection of the first inorganic layer of the bending region on the flexible substrate.
4. The flexible display panel of claim 1,
the non-bending areas are arranged on two opposite sides of the bending area.
5. The flexible display panel of claim 1,
and notches are respectively arranged on two opposite sides of the first inorganic layer in the bending area along the direction parallel to the bending axis of the bending area.
6. The flexible display panel of claim 5,
the length of the notch in the direction perpendicular to the bending axis of the bending area is greater than or equal to pi R; wherein R is the curvature radius of the bending area.
7. The flexible display panel of claim 5,
the width of the notch is 5-150 μm along the direction parallel to the bending axis of the bending area.
8. The flexible display panel of claim 5,
in the plane of the flexible display panel, the shape of the notch is at least one of a rectangle, a circle, a semicircle, a truncated circle, a U-shaped shape and a trapezoid.
9. The flexible display panel of claim 5,
the edge of the notch is arc-shaped.
10. The flexible display panel of claim 5,
and in the direction perpendicular to the bending axis of the bending area, the notch covers the bending area and the edge of the bending area adjacent to the non-bending area.
11. The flexible display panel of claim 5,
and in the direction perpendicular to the bending axis of the bending area, the distance between the edge of the notch and the edge of the flexible substrate is gradually reduced after being gradually increased.
12. The flexible display panel of claim 1,
the first inorganic layer includes a central region and an edge region surrounding the central region; the first inorganic layer of the edge region comprises at least one slit; the slit penetrates the first inorganic layer in a direction perpendicular to the flexible substrate.
13. The flexible display panel of claim 1, wherein the driving circuit layer comprises:
a buffer layer on the flexible substrate;
an active layer on the buffer layer;
a gate insulating layer on the active layer;
a gate electrode on the gate insulating layer;
an interlayer insulating layer on the gate electrode;
a source electrode and a drain electrode on the interlayer insulating layer;
and a passivation layer on the source electrode and the drain electrode;
the first inorganic layer of the non-display region includes any one layer or a combination of multiple layers of the buffer layer, the gate insulating layer, the interlayer insulating layer, the passivation layer, and an inorganic encapsulation layer in the encapsulation structure.
14. A display device characterized by comprising the flexible display panel according to any one of claims 1 to 13.
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| CN111081150B (en) * | 2019-12-31 | 2021-08-24 | 厦门天马微电子有限公司 | Support membrane and display device |
| CN111128028A (en) * | 2019-12-31 | 2020-05-08 | 武汉华星光电半导体显示技术有限公司 | Bendable display panel, display device and display equipment |
| CN111261643B (en) * | 2020-02-10 | 2022-12-06 | 武汉华星光电半导体显示技术有限公司 | Flexible display panel and preparation method |
| CN111402735A (en) * | 2020-03-26 | 2020-07-10 | 武汉华星光电半导体显示技术有限公司 | Display device |
| CN111584557B (en) * | 2020-05-07 | 2022-09-27 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN112341949B (en) * | 2020-11-03 | 2022-11-01 | 京东方科技集团股份有限公司 | Protective film, protective film attaching method, display module and display device |
| CN112599693B (en) * | 2020-12-07 | 2022-09-06 | 合肥维信诺科技有限公司 | Display panel and display device |
| TWI761015B (en) * | 2020-12-31 | 2022-04-11 | 友達光電股份有限公司 | Flexible display module |
| CN113920877B (en) * | 2021-10-20 | 2023-11-28 | 武汉华星光电半导体显示技术有限公司 | Display panel and display terminal |
| CN114038325B (en) * | 2021-11-26 | 2023-10-20 | 武汉天马微电子有限公司 | Display panel and manufacturing method thereof |
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