CN108564885B - Flexible display panel, manufacturing method thereof and flexible display device - Google Patents
Flexible display panel, manufacturing method thereof and flexible display device Download PDFInfo
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- CN108564885B CN108564885B CN201810027212.7A CN201810027212A CN108564885B CN 108564885 B CN108564885 B CN 108564885B CN 201810027212 A CN201810027212 A CN 201810027212A CN 108564885 B CN108564885 B CN 108564885B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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Abstract
The application discloses a flexible display panel, a manufacturing method thereof and a flexible display device, and relates to the technical field of display, wherein the flexible display panel comprises a flexible substrate, a display functional layer and a touch functional layer which are sequentially arranged; a photosensitive adhesive layer is arranged between the touch control functional layer and the display functional layer and comprises a first photosensitive adhesive and a second photosensitive adhesive, the first photosensitive adhesive and the second photosensitive adhesive are arranged on the same layer, and the elastic modulus of the first photosensitive adhesive is larger than that of the second photosensitive adhesive. Therefore, when the flexible display panel and the flexible display device are bent, the second photosensitive adhesive with the smaller elastic modulus can transfer bending stress of the touch functional layer, so that stress actually borne by the touch functional layer is reduced, the phenomenon that cracks cause line breakage in the bending process of the touch functional layer is effectively avoided, the touch function of the flexible display panel and the flexible display device can be normally exerted in the bending process, and the touch reliability is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a flexible display panel, a manufacturing method thereof and a flexible display device.
Background
In recent years, Organic Light-Emitting diodes (OLEDs) have become a very popular flat panel display industry in the sea and abroad, which is known as the next generation of "star" flat panel display technology, mainly because OLEDs have the characteristics of self-luminescence, wide viewing angle, fast response time, high luminous efficiency, thin panel thickness, capability of manufacturing large-sized and bendable panels, simple manufacturing process, low cost, and the like.
In addition, the touch screen technology has gradually replaced the key technology as the mainstream technology of the mobile terminal and the like. Touch screen technology is a technology in which when a finger, a pen, or the like touches a touch screen mounted on the front end of a display, the touched position (in the form of coordinates) is detected and sent to a CPU, thereby specifying the information to be input. At present, the application range of the touch screen is very wide, and the main products include touch mobile phones, notebook computers and other mobile terminals, and human-computer display interfaces in the industrial automation industry.
With the development of display technology, a flexible display panel integrated with a touch function becomes a hot point and a mainstream technical trend of research, and how to improve the reliability of the flexible touch display panel is a key technical problem in the industry.
Disclosure of Invention
In view of this, a technical problem to be solved by the present application is to provide a flexible display panel, a manufacturing method thereof, and a flexible display device, in which a first photosensitive adhesive with a larger elastic modulus and a second photosensitive adhesive with a smaller elastic modulus are disposed between a touch functional layer and a display functional layer, and an external force applied to the touch functional layer during a bending process is transferred through the second photosensitive adhesive, so as to prevent the touch functional layer from breaking due to cracks.
In order to solve the technical problem, the following technical scheme is adopted:
in a first aspect, the present application provides a flexible display panel, including a flexible substrate, a display functional layer, and a touch functional layer, which are sequentially disposed;
a photosensitive adhesive layer is arranged between the touch control functional layer and the display functional layer and comprises a first photosensitive adhesive and a second photosensitive adhesive, the first photosensitive adhesive and the second photosensitive adhesive are arranged on the same layer, and the elastic modulus of the first photosensitive adhesive is larger than that of the second photosensitive adhesive.
In a second aspect, the present application provides a method for manufacturing a flexible display panel, including:
providing a flexible substrate;
forming a display function layer on the flexible substrate;
forming a touch functional layer, and bonding the touch functional layer and the display functional layer by using a photosensitive adhesive layer;
the photosensitive glue layer comprises a first photosensitive glue layer and a second photosensitive glue layer, the first photosensitive glue layer and the second photosensitive glue layer are arranged on the same layer, and the elastic modulus of the first photosensitive glue layer is larger than that of the second photosensitive glue layer.
In a third aspect, the present application provides a flexible display device, including a flexible display panel, where the flexible display panel is the flexible display panel provided in the present application.
Compared with the prior art, the flexible display panel, the manufacturing method thereof and the flexible display device have the advantages that:
in the flexible display panel, the manufacturing method thereof and the flexible display device provided by the application, a first photosensitive adhesive with a larger elastic modulus and a second photosensitive adhesive with a smaller elastic modulus are arranged between a display functional layer and a touch functional layer in the flexible display panel, wherein the first photosensitive adhesive with a large elastic modulus can reliably fix the touch functional layer on the display functional layer, and in addition, in the process of bending the flexible display panel, the second photosensitive adhesive with smaller elastic modulus can transfer the bending stress applied to the touch functional layer, reduce the bending stress actually applied to the touch functional layer, avoid the touch functional layer from being broken due to cracks when being subjected to larger bending external force, therefore, the flexible display panel and the flexible display device can be guaranteed to normally play a touch function in the bending process, and the touch reliability of the flexible display panel and the flexible display device in the bending process is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a top view of a flexible display panel according to an embodiment of the present application;
fig. 2 is a cross-sectional view of a flexible display panel along a-a in fig. 1 according to an embodiment of the present application;
FIG. 3 is a cross-sectional view of another flexible display panel taken along line A-A of FIG. 1 according to an embodiment of the present application;
FIG. 4 is a cross-sectional view of a flexible display panel taken along line A-A of FIG. 1 according to an embodiment of the present application;
fig. 5 is a schematic layout view of a touch electrode according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram illustrating a touch electrode formed by a metal mesh in the embodiment of the present application;
fig. 7 is a schematic structural diagram of a touch electrode layer provided in the present embodiment;
fig. 8 is a schematic view illustrating irradiation of a flexible display panel with ultraviolet light;
fig. 9 is a schematic top view of a flexible display panel according to an embodiment of the present application;
FIG. 10 is a cross-sectional view of the flexible display panel shown in FIG. 9 taken along B-B;
fig. 11 is a schematic structural diagram illustrating a display functional layer in a flexible display panel according to an embodiment of the present disclosure;
fig. 12 is a flowchart illustrating a method for manufacturing a flexible display panel according to an embodiment of the present disclosure;
fig. 13 is a diagram illustrating a manufacturing process of a flexible display panel according to an embodiment of the present application;
fig. 14 is a schematic structural diagram of a flexible display device according to an embodiment of the present disclosure.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result. Furthermore, the term "coupled" is intended to encompass any direct or indirect electrical coupling. Thus, if a first device couples to a second device, that connection may be through a direct electrical coupling or through an indirect electrical coupling via other devices and couplings. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
A flexible touch display panel in the prior art includes a display functional layer and a touch functional layer. When the touch display panel is manufactured, firstly, the display functional layer and the touch functional layer are manufactured respectively, and then the display functional layer and the touch functional layer are attached to form the touch display panel. However, since the touch functional layer is located at a non-neutral surface in the overall structure of the flexible touch display panel, when the flexible touch display panel is bent, the touch functional layer is stressed during the bending process, and cracks are easily generated to cause disconnection, thereby affecting the normal touch function of the touch display panel.
In view of this, a technical problem to be solved by the present application is to provide a flexible display panel, a manufacturing method thereof, and a flexible display device, in which a first photosensitive adhesive with a larger elastic modulus and a second photosensitive adhesive with a smaller elastic modulus are disposed between a touch functional layer and a display functional layer, and an external force applied to the touch functional layer during a bending process is transferred through the second photosensitive adhesive, so as to prevent the touch functional layer from breaking due to cracks.
First, referring to fig. 1 and fig. 2, fig. 1 is a top view of a flexible display panel provided in an embodiment of the present disclosure, fig. 2 is a cross-sectional view of the flexible display panel provided in the embodiment of the present disclosure along a-a in fig. 1, and with reference to fig. 1 and fig. 2, a flexible display panel 100 provided in the embodiment of the present disclosure includes a flexible substrate 10, a display functional layer 20, and a touch functional layer 30, which are sequentially disposed;
a photosensitive adhesive layer 40 is disposed between the touch functional layer 30 and the display functional layer 20, the photosensitive adhesive layer 40 includes a first photosensitive adhesive 41 and a second photosensitive adhesive 42, the first photosensitive adhesive 41 and the second photosensitive adhesive 42 are disposed on the same layer, and an elastic modulus of the first photosensitive adhesive 41 is greater than an elastic modulus of the second photosensitive adhesive 42.
Specifically, referring to fig. 1, the flexible display panel 100 provided in the embodiment of the present application is provided with a display area 11 and a non-display area 12, referring to fig. 2, the flexible display panel 100 provided in the embodiment of the present application introduces a touch functional layer 30 on the basis of a flexible substrate 10 and a display functional layer 20, and bonds the touch functional layer 30 on a surface of the display functional layer 20 away from the flexible substrate 10, thereby implementing a touch function of the flexible display panel 100. In particular, in the flexible display panel 100 provided in the embodiment of the present application, the touch functional layer 30 and the display functional layer 20 are bonded by the photosensitive adhesive layer 40, the photosensitive adhesive layer 40 includes a first photosensitive adhesive 41 with a relatively large elastic modulus and a second photosensitive adhesive 42 with a relatively small elastic modulus, and the second photosensitive adhesive 42 with a relatively small elastic modulus has relatively high flexibility; reliable adhesion between the touch functional layer 30 and the display functional layer 20 is achieved by the first photosensitive adhesive 41 having a large elastic modulus, the stress transfer during bending is achieved by the second photosensitive adhesive 42, which has a lower modulus of elasticity and, in particular, for a membrane layer with regions of different stiffness, the region of lesser stiffness (i.e., the region of lesser elastic modulus) will absorb stress when bending occurs, that is, when the flexible display panel 100 is bent, the second photosensitive adhesive 42 with a smaller elastic modulus can absorb the stress applied to the touch functional layer 30 with a larger hardness, so as to reduce the stress actually applied to the touch functional layer 30 during the bending process, prevent the touch functional layer 30 from breaking due to cracks when subjected to a larger external bending force, therefore, it is beneficial to ensure that the flexible display panel 100 normally performs the touch function in the bending process, so as to improve the touch reliability of the flexible display panel 100 in the bending process.
Optionally, fig. 3 is a cross-sectional view of another flexible display panel provided in the embodiment of the present application along a-a in fig. 1, and fig. 4 is a cross-sectional view of another flexible display panel provided in the embodiment of the present application along a-a in fig. 1, where the touch functional layer 30 includes a substrate 31 and a touch electrode layer 32, and the touch electrode layer 32 is disposed on a side of the substrate 31 close to the photosensitive adhesive, or the touch electrode layer 32 is disposed on a side of the substrate 31 away from the photosensitive adhesive.
Specifically, since the touch functional layer 30 in the present application is manufactured independently from the display functional layer 20, the touch functional layer 30 includes the substrate 31 and the touch electrode layer 32 disposed on the substrate 31, when the touch functional layer 30 is attached to the display functional layer 20 by using the photosensitive adhesive, referring to fig. 3, one side of the touch electrode may be disposed close to the display functional layer 20, that is, the touch electrode layer 32 is disposed on one side of the substrate 31 close to the photosensitive adhesive, and at this time, the photosensitive adhesive layer 40 and the touch electrode layer 32 are in direct contact. When the flexible display panel 100 is bent, the second photosensitive adhesive 42 with a smaller elastic modulus in the photosensitive adhesive layer 40 in direct contact with the touch electrode layer 32 can absorb the bending stress applied to the touch electrode layer 32, so that the bending stress actually applied to the touch electrode layer 32 is reduced, and the touch electrode layer 32 is prevented from cracking and breaking, thereby ensuring that the touch electrode layer 32 can normally perform a touch function in the bending process.
In addition to attaching the touch functional layer 30 to the display functional layer 20 in the manner of the embodiment shown in fig. 3, the touch functional layer 30 may also be attached to the display functional layer 20 in the manner of the embodiment shown in fig. 4. In the embodiment shown in fig. 4, the substrate 31 is disposed close to the display function layer 20, and the touch electrode layer 32 is disposed far from the display function layer 20, that is, the touch electrode layer 32 is disposed on a side of the substrate 31 far from the photosensitive adhesive, and the photosensitive adhesive layer 40 and the substrate 31 are in direct contact. When the flexible display panel 100 is bent, the second photosensitive adhesive 42 with a smaller elastic modulus in the photosensitive adhesive layer 40 can absorb the bending stress applied to the touch electrode layer 32 through the substrate 31, so that the bending stress actually applied to the touch electrode layer 32 is reduced to a certain extent, the crack and disconnection phenomenon of the touch electrode layer 32 in the bending process can be avoided, and the touch function layer 30 can be ensured to normally exert the touch function in the bending process.
Optionally, referring to fig. 3 and fig. 4, in the touch function layer 30 provided in the embodiment of the present application, the touch electrode layer 32 includes a plurality of touch electrodes 320, and the touch electrodes 320 include at least one metal mesh.
Specifically, the touch electrodes in the embodiments shown in fig. 3 and fig. 4 may be self-capacitance touch electrodes or mutual capacitance touch electrodes. When the touch electrodes are self-capacitive touch electrodes, referring to fig. 5, fig. 5 is a schematic layout of the touch electrodes provided in the embodiment of the present application, each touch electrode 320 is connected to one touch electrode lead 321, and in the touch stage, the touch electrode 320 receives a touch detection signal through the touch electrode lead 321 and sends a touch sensing signal through the touch electrode lead 321. When the touch sensing electrode is used as a mutual capacitance type touch electrode, the touch electrode comprises a touch driving electrode and a touch sensing electrode, the touch driving electrode receives a touch signal in a touch stage, and the touch sensing electrode feeds back a touch detection signal when the touch sensing electrode is touched by the outside. It should be noted that the touch driving electrode and the touch sensing electrode may be disposed on the same layer or on different film layers, which is not specifically limited in this application.
In addition, it should be noted that the touch electrode in the present application is formed by using a metal grid, referring to fig. 6, fig. 6 is a schematic diagram illustrating an embodiment of the present application in which the touch electrode is formed by using a metal grid, and metal wires of the metal grid forming the touch electrode 320 are located in a non-opening area of the flexible display panel 100, so as to avoid that the metal wires forming the touch electrode 320 influence normal display in a display process of the flexible display panel 100.
Optionally, with continued reference to fig. 2, the flexible display panel 100 is provided with a light-curing region 61 and a non-curing region 62, the first photosensitive adhesive 41 is located in the light-curing region 61, and the second photosensitive adhesive 42 is located in the non-curing region 62; the first photosensitive adhesive 41 and the second photosensitive adhesive 42 are formed by irradiating the same photosensitive adhesive layer 40 with ultraviolet light.
Specifically, in the actual production process, after the touch functional layer 30 is attached to the display functional layer 20 by using the photosensitive adhesive layer 40, the photosensitive adhesive is irradiated by ultraviolet light, so that a first photosensitive adhesive 41 with a large elastic modulus and a second photosensitive adhesive 42 with a small elastic modulus are formed. After the photosensitive adhesive in the photocuring area 61 is irradiated by ultraviolet light, the photosensitizer is activated, the photosensitive adhesive is cured, the hardness is increased, the first photosensitive adhesive 41 with a large elastic modulus is formed, and the touch functional layer 30 and the display functional layer 20 can be reliably fixed. The photosensitive adhesive in the non-curing area 62 is not irradiated by ultraviolet light, curing is not performed, the second photosensitive adhesive 42 with the smaller elastic modulus and the stronger flexibility is formed, when the flexible display panel 100 is bent, the second photosensitive adhesive 42 with the smaller elastic modulus can absorb the bending stress of the touch functional layer 30, the stress actually received by the touch functional layer 30 is reduced, the phenomenon that cracks and broken lines occur in the touch functional layer 30 is avoided, bending is easier for the flexible display panel 100, and meanwhile, the normal touch performance can be kept.
Optionally, referring to fig. 7 and 8, fig. 7 is a schematic structural diagram of a touch electrode 320 layer used in the embodiment of the present disclosure, fig. 8 is a schematic diagram of irradiating a flexible display panel with ultraviolet light, an orthogonal projection of the photocured region 61 on the plane of the flexible substrate 10 and an orthogonal projection of the touch electrode 320 on the plane of the flexible substrate 10 do not overlap, and an orthogonal projection of the non-cured region 62 on the plane of the flexible substrate 10 and an orthogonal projection of the touch electrode 320 on the plane of the flexible substrate 10 overlap.
Specifically, with continued reference to fig. 8, when the photosensitive adhesive is irradiated with ultraviolet light, the photosensitive adhesive is irradiated from a side of the touch functional layer 30 close to the substrate 31. Referring to fig. 7, the touch electrode layer 32 in the touch function layer 30 includes a metal bridge 322 in addition to the metal touch electrode 320, and the metal bridge 322 is used to realize electrical connection between electrodes. When the photosensitive adhesive layer is irradiated by ultraviolet light from a side close to the substrate 31, the metal bridge 322 and the metal touch electrode 320 are made of metal materials and do not transmit light, so that the photosensitive adhesive corresponding to the area covered by the metal touch electrode 320 and the metal bridge 322 is not affected by the ultraviolet light, and the photosensitive adhesive is not cured to form the second photosensitive adhesive 42 with a smaller elastic modulus, so that the orthographic projection of the non-cured area 62 on the plane of the flexible substrate 10 is overlapped with the orthographic projection of the touch electrode 320 on the plane of the flexible substrate 10; the photosensitive adhesive in the area not covered by the metal touch electrode 320 and the metal bridge 322 is irradiated by the ultraviolet light, and the photosensitizer of the photosensitive adhesive is excited to be cured and increase in hardness to form the first photosensitive adhesive 41 with a larger elastic modulus, that is, the orthographic projection of the photocuring area 61 on the plane of the flexible substrate 10 is not overlapped with the orthographic projection of the touch electrode 320 on the plane of the flexible substrate 10. Through this kind of mode, directly utilize ultraviolet ray to shine the photosensitive glue layer from one side of touch-control functional layer 30 basement 31, because the barrier effect of touch-control electrode layer 32, can form first photosensitive glue 41 and second photosensitive glue 42 at the photosensitive glue layer promptly, the production technology is simple and reliable, can reliably fix touch-control functional layer 30 with display functional layer 20, can reduce the bending stress that touch-control functional layer 30 received in the flexible display panel 100 bending process again, be favorable to promoting the touch-control reliability in the bending process of flexible display panel 100.
Optionally, fig. 9 is another top view of the flexible display panel provided in the embodiment of the present application, fig. 10 is a cross-sectional view of the flexible display panel shown in fig. 9 along B-B, referring to fig. 9 and 10, the flexible display panel 100 further includes a plurality of sub-pixel opening areas 50 arranged in an array, and a forward projection of the sub-pixel opening areas 50 on a plane of the flexible substrate 10 overlaps with the non-cured area 62.
Specifically, referring to fig. 9, the flexible display panel 100 includes sub-pixel opening areas 50 arranged in an array, the sub-pixel opening areas 50 are located in the display area 11 of the flexible display panel, where the opening areas refer to effective areas through which light can pass on the display panel 100, in some implementations of the prior art, for example, areas where signal lines are located on the display panel, thin film transistors themselves, and storage capacitors for storing voltages are located are not completely transparent, and because light passing through these areas is not controlled by voltages, correct gray scales cannot be displayed, and these areas are blocked by black matrixes, thereby forming non-opening areas and being opaque. For the OLED panel, the sub-pixel opening area refers to the area corresponding to the organic light emitting layer in each OLED light emitting device. In order to prevent the ultraviolet light irradiation process from affecting the sub-pixel opening area of the display panel 100, before the photosensitive adhesive is irradiated by the ultraviolet light, the sub-pixel opening area of the display panel can be shielded by the baffle plate, so that the ultraviolet light is prevented from irradiating the sub-pixel opening area through the photosensitive adhesive and affecting the normal light emission of the sub-pixel opening area, and thus, the photosensitive adhesive corresponding to the baffle plate 70 will not be cured, referring to fig. 10, the area where the part of the photosensitive adhesive is located also becomes the non-curing area 62, and the orthographic projection of the non-curing area 62 on the plane where the flexible substrate 10 is located overlaps the orthographic projection of the sub-pixel opening area 50 on the plane where the flexible substrate 10 is located. It should be noted that other implementation manners are also available in the present application, for example, other areas of the display panel may be selectively shielded by using the baffle before the photosensitive adhesive is irradiated by using ultraviolet light, so as to improve the performance of the display panel, which is not limited in this application.
Optionally, fig. 11 is a schematic structural diagram of a display functional layer in a flexible display panel provided in an embodiment of the present application, and referring to fig. 11, a display functional layer 20 includes a thin film transistor array layer 21, a light-emitting functional layer 22, and a thin film encapsulation layer 23, which are sequentially disposed, and a touch functional layer 30 in the embodiment shown in fig. 2 in the present application is disposed close to the thin film encapsulation layer 23.
Specifically, referring to fig. 11, the light emitting function layer 22 includes an anode layer 221, a light emitting layer 222, and a cathode layer 223 which are sequentially disposed, and a drain electrode of the thin film transistor in the thin film transistor array layer 21 is electrically connected to the anode layer 221 in the light emitting function layer 22, and the thin film transistor controls the light emitting function layer 22 through the drain electrode thereof. The light emitting layer 222 may be formed of a low molecular weight organic material or a high molecular weight organic material, and the light emitting layer 222 includes an organic emission layer, and may further include 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). Of course, the light-emitting functional layer 22 in the present application may also include other film layers in the prior art, and will not be described in detail in this description. The film encapsulation layer 23 includes a first inorganic film 231, a first organic film 232 and a second inorganic film 233, which are sequentially disposed, the first inorganic film 231 and the second inorganic film 233 have high compactness and can effectively block water and oxygen, and the first organic film 232 has high elasticity and can effectively inhibit the inorganic film from cracking as a buffer layer.
Based on the same inventive concept, the present application further provides a method for manufacturing a flexible display panel, and fig. 12 is a flowchart of the method for manufacturing the flexible display panel according to the embodiment of the present application, and referring to fig. 12 and fig. 2, the method for manufacturing the flexible display panel includes:
102, forming a display function layer 20 on a flexible substrate 10;
104, bonding the touch control functional layer 30 and the display functional layer 20 by using photosensitive adhesive; the photosensitive adhesive includes a first photosensitive adhesive 41 and a second photosensitive adhesive 42, the first photosensitive adhesive 41 and the second photosensitive adhesive 42 are disposed on the same layer, and the elastic modulus of the first photosensitive adhesive 41 is greater than that of the second photosensitive adhesive 42.
Specifically, referring to fig. 12, after the display functional layer 20 and the touch functional layer 30 are respectively manufactured, the touch functional layer 30 and the display functional layer 20 are bonded by using a photosensitive adhesive, so as to form the structure shown in fig. 2. In particular, the photosensitive adhesive layer 40 includes a first photosensitive adhesive 41 with a larger elastic modulus and a second photosensitive adhesive 42 with a smaller elastic modulus, and the second photosensitive adhesive 42 with a smaller elastic modulus has stronger flexibility; reliable adhesion between the touch functional layer 30 and the display functional layer 20 is achieved by the first photosensitive adhesive 41 having a large elastic modulus, the stress transfer during bending is achieved by the second photosensitive adhesive 42, which has a lower modulus of elasticity and, in particular, for a membrane layer with regions of different stiffness, the region of lesser stiffness (i.e., the region of lesser elastic modulus) will absorb stress when bending occurs, that is, when the flexible display panel 100 is bent, the second photosensitive adhesive 42 with a smaller elastic modulus can absorb the stress applied to the touch functional layer 30 with a larger hardness, so as to reduce the stress actually applied to the touch functional layer 30 during the bending process, prevent the touch functional layer 30 from breaking due to cracks when subjected to a larger external bending force, therefore, it is beneficial to ensure that the flexible display panel 100 normally performs the touch function in the bending process, so as to improve the touch reliability of the flexible display panel 100 in the bending process.
It should be noted that, in the embodiment of the present application, the step of forming the display function layer 20 and the step of forming the touch function layer 30 on the flexible substrate 10 may be flexibly adjusted or performed simultaneously, and the application is not particularly limited thereto.
Optionally, referring to fig. 3-4 and fig. 6, the touch functional layer 30 includes a substrate 31 and a touch electrode layer 32, the touch electrode layer 32 is disposed on a side of the substrate 31 close to the photosensitive adhesive, or the touch electrode layer 32 is disposed on a side of the substrate 31 away from the photosensitive adhesive, the touch electrode layer 32 includes a plurality of touch electrodes 320, and the touch electrodes 320 include at least one metal mesh.
Specifically, since the touch functional layer 30 in the present application is manufactured independently from the display functional layer 20, the touch functional layer 30 includes the substrate 31 and the touch electrode layer 32 disposed on the substrate 31, when the touch functional layer 30 is attached to the display functional layer 20 by using the photosensitive adhesive, referring to fig. 3, one side of the touch electrode may be disposed close to the display functional layer 20, that is, the touch electrode layer 32 is disposed on one side of the substrate 31 close to the photosensitive adhesive, and at this time, the photosensitive adhesive is in direct contact with the touch electrode. When the flexible display panel 100 is bent, the second photosensitive adhesive 42 with a smaller elastic modulus in the photosensitive adhesive in direct contact with the touch electrode layer 32 can absorb the bending stress applied to the touch electrode layer 32, so that the bending stress actually applied to the touch electrode layer 32 is reduced, and the touch electrode layer 32 is prevented from cracking and breaking, thereby ensuring that the touch electrode layer 32 can normally perform a touch function in the bending process.
Unlike the embodiment shown in fig. 3, in the embodiment shown in fig. 4, the substrate 31 is disposed close to the display function layer 20, and the touch electrode 320 is disposed away from the display function layer 20, that is, the touch electrode layer 32 is disposed on a side of the substrate 31 away from the photosensitive adhesive layer 40, where the photosensitive adhesive layer 40 and the substrate 31 are in direct contact. When the flexible display panel 100 is bent, the second photosensitive adhesive 42 with a smaller elastic modulus in the photosensitive adhesive layer 40 can absorb the bending stress applied to the touch electrode layer 32 through the substrate 31, so that the bending stress actually applied to the touch electrode layer 32 is reduced to a certain extent, the crack and disconnection phenomenon of the touch electrode layer 32 in the bending process can be avoided, and the touch function layer 30 can be ensured to normally exert the touch function in the bending process.
In addition, it should be noted that the touch electrode 320 in the present application is formed in a metal grid, and referring to fig. 6, metal lines of the metal grid forming the touch electrode are located in a non-opening area of the flexible display panel 100, so as to avoid that the metal lines forming the touch electrode influence normal display in the display process of the flexible display panel 100.
Optionally, the method for manufacturing a flexible display panel provided in the embodiment of the present application further includes: the same layer of photosensitive glue is irradiated with ultraviolet light to form a photocured area 61 and a non-cured area 62, such that the first photosensitive glue 41 is located in the photocured area 61 and the second photosensitive glue 42 is located in the non-cured area 62, see fig. 8.
Specifically, referring to fig. 8, after the touch functional layer 30 is attached to the display functional layer 20 by using the photosensitive adhesive layer, the same photosensitive adhesive layer is irradiated by ultraviolet light, so that a first photosensitive adhesive 41 with a large elastic modulus and a second photosensitive adhesive 42 with a small elastic modulus are formed. After the photosensitive adhesive in the photocuring area 61 is irradiated by ultraviolet light, the photosensitizer is activated, the photosensitive adhesive is cured, the hardness is increased, the first photosensitive adhesive 41 with a large elastic modulus is formed, and the touch functional layer 30 and the display functional layer 20 can be reliably fixed. The photosensitive adhesive in the non-curing area 62 is not irradiated by ultraviolet light, curing is not performed, the second photosensitive adhesive 42 with the smaller elastic modulus and the stronger flexibility is formed, when the flexible display panel 100 is bent, the second photosensitive adhesive 42 with the smaller elastic modulus can absorb the bending stress of the touch functional layer 30, the stress actually received by the touch functional layer 30 is reduced, the phenomenon that cracks and broken lines occur in the touch functional layer 30 is avoided, bending is easier for the flexible display panel 100, and meanwhile, the normal touch performance can be kept.
It should be noted that, in the present application, the touch electrode is formed in the form of a metal grid as shown in fig. 6, and metal wires of the metal grid forming the touch electrode are located in a non-opening area of the flexible display panel, so as to avoid that the metal wires forming the touch electrode influence normal display in the display process of the flexible display panel.
Optionally, the same layer of photosensitive glue is irradiated with ultraviolet light, further: the same layer of photosensitive glue is irradiated with ultraviolet light from the side close to the substrate 31.
Specifically, referring to fig. 8, the touch electrode layer in the touch functional layer 30 includes a metal bridge 322 in addition to the metal touch electrode 320, and the metal bridge 322 is used to realize the electrical connection between the electrodes. When the photosensitive adhesive is irradiated by ultraviolet light from the side close to the substrate 31, the metal bridge 322 and the metal touch electrode 320 are made of metal materials and do not transmit light, so that the photosensitive adhesive corresponding to the area covered by the metal touch electrode 320 and the metal bridge 322 is not affected by the ultraviolet light, and the photosensitive adhesive is not cured at the part, so that the second photosensitive adhesive 42 with a smaller elastic modulus is formed; the photosensitive adhesive in the area not covered by the metal touch electrode 320 and the metal bridge 322 is irradiated by the ultraviolet light, and the photosensitizer of the photosensitive adhesive is excited to be cured and increase in hardness, so that the first photosensitive adhesive 41 with a higher elastic modulus is formed. Through this kind of mode, directly utilize ultraviolet ray to shine from one side of basement 31 to photosensitive glue, because the blocking effect of touch-control electrode layer 32, can form first photosensitive glue 41 and second photosensitive glue 42 at photosensitive glue promptly, the production technology is simple reliable, can reliably fix touch-control functional layer 30 and display functional layer 20, can reduce the bending stress that touch-control functional layer 30 received in the flexible display panel 100 bending process again, is favorable to promoting the touch-control reliability in the bending process of flexible display panel 100.
Alternatively, referring to fig. 13, fig. 13 is a manufacturing process diagram of the flexible display panel 100 according to the embodiment of the present application, before irradiating the same layer of photosensitive glue from a side close to the substrate 31 with ultraviolet light, further including: a barrier 70 is provided on the side of the touch functional layer 30 remote from the display functional layer 20. In this way, in addition to the metal touch electrodes 320 and the metal bridges 322 in the touch functional layer 30 being capable of shielding the ultraviolet light, the baffles 70 are also capable of shielding the ultraviolet light, and the area covered by the metal touch electrodes 320 and the metal bridges 322 may not be provided with baffles. The curing glue corresponding to the area covered by the baffle 70 is not cured. By the mode, a user can selectively select the areas which do not need to be solidified according to actual requirements, so that the distribution of the solidified areas and the non-solidified areas is more flexible.
Optionally, with continued reference to fig. 13, the flexible display panel 100 includes a plurality of sub-pixel opening areas 50 arranged in an array, and an orthogonal projection of the barrier 70 on the plane of the flexible substrate 10 overlaps with an orthogonal projection of the sub-pixel opening area 50 on the plane of the flexible substrate 10.
Specifically, referring to fig. 13, since the sub-pixel opening area 50 is an effective area through which light can pass on the display panel 100, and this partial area may be affected by ultraviolet light, before the photosensitive adhesive is irradiated by ultraviolet light, a baffle 70 is disposed at a position corresponding to the sub-pixel opening area 50, so that an orthogonal projection of the baffle 70 on a plane where the flexible substrate 10 is located overlaps an orthogonal projection of the sub-pixel opening area 50 on the plane where the flexible substrate 10 is located, thereby preventing the ultraviolet light from irradiating the sub-pixel opening area 50, and preventing the ultraviolet light irradiation process from affecting the opening area of the display panel 100.
Based on the same inventive concept, the present application further provides a flexible display device 200, please refer to fig. 14, and fig. 14 is a schematic structural diagram of the flexible display device 200 provided in the embodiment of the present application, in which the flexible display device 200 includes a flexible display panel 100, and the flexible display panel is the flexible display panel 100 provided in the embodiment of the present application. The flexible display device 200 provided in the embodiment of the present application may be: any product or component with practical functions such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. In the present application, the embodiment of the display device 200 can refer to the embodiment of the display panel 100, and repeated descriptions are omitted here.
According to the embodiments, the application has the following beneficial effects:
in the flexible display panel, the manufacturing method thereof and the flexible display device provided by the application, a first photosensitive adhesive with a larger elastic modulus and a second photosensitive adhesive with a smaller elastic modulus are arranged between a display functional layer and a touch functional layer in the flexible display panel, wherein the first photosensitive adhesive with a large elastic modulus can reliably fix the touch functional layer on the display functional layer, and in addition, in the process of bending the flexible display panel, the second photosensitive adhesive with smaller elastic modulus can transfer the bending stress applied to the touch functional layer, reduce the bending stress actually applied to the touch functional layer, avoid the touch functional layer from being broken due to cracks when being subjected to larger bending external force, therefore, the flexible display panel and the flexible display device can be guaranteed to normally play a touch function in the bending process, and the touch reliability of the flexible display panel and the flexible display device in the bending process is improved.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (11)
1. A flexible display panel is characterized by comprising a flexible substrate, a display functional layer and a touch functional layer which are sequentially arranged; the touch function layer comprises a plurality of touch electrodes;
a photosensitive adhesive layer is arranged between the touch functional layer and the display functional layer, the photosensitive adhesive layer comprises a first photosensitive adhesive and a second photosensitive adhesive, and the first photosensitive adhesive and the second photosensitive adhesive are arranged on the same layer;
the flexible display panel is provided with a photocuring area and a non-curing area, the first photosensitive adhesive is located in the photocuring area, and the second photosensitive adhesive is located in the non-curing area; the elastic modulus of the first photosensitive adhesive is greater than that of the second photosensitive adhesive; the orthographic projection of the photocuring area on the plane of the flexible substrate is not overlapped with the orthographic projection of the touch electrode on the plane of the flexible substrate, and the orthographic projection of the non-photocuring area on the plane of the flexible substrate is overlapped with the orthographic projection of the touch electrode on the plane of the flexible substrate.
2. The flexible display panel according to claim 1, wherein the touch functional layer comprises a substrate and a touch electrode layer, and the touch electrode layer is disposed on a side of the substrate close to the photosensitive adhesive layer, or the touch electrode layer is disposed on a side of the substrate away from the photosensitive adhesive layer.
3. The flexible display panel of claim 1, wherein the touch electrode comprises at least one metal mesh.
4. The flexible display panel of claim 1, further comprising a plurality of sub-pixel opening areas arranged in an array, wherein an orthographic projection of the sub-pixel opening areas on a plane of the flexible substrate overlaps the non-curing area.
5. The flexible display panel according to claim 1, wherein the display function layer comprises a thin film transistor array layer, a light emitting function layer and a thin film encapsulation layer, which are sequentially disposed, and the touch function layer is disposed adjacent to the thin film encapsulation layer.
6. A method for manufacturing a flexible display panel is characterized by comprising the following steps:
providing a flexible substrate;
forming a display function layer on the flexible substrate;
forming a touch function layer, wherein the touch function layer comprises a plurality of touch electrodes;
bonding the touch control functional layer and the display functional layer by using a photosensitive adhesive layer; the photosensitive glue layer comprises a first photosensitive glue and a second photosensitive glue, and the first photosensitive glue and the second photosensitive glue are arranged on the same layer;
irradiating the same layer of photosensitive adhesive layer by using ultraviolet light to form a photocuring area and a non-curing area, so that the first photosensitive adhesive is positioned in the photocuring area, and the second photosensitive adhesive is positioned in the non-curing area; the elastic modulus of the first photosensitive adhesive is greater than that of the second photosensitive adhesive; the orthographic projection of the photocuring area on the plane of the flexible substrate is not overlapped with the orthographic projection of the touch electrode on the plane of the flexible substrate, and the orthographic projection of the non-photocuring area on the plane of the flexible substrate is overlapped with the orthographic projection of the touch electrode on the plane of the flexible substrate.
7. The method according to claim 6, wherein the touch functional layer comprises a substrate and a touch electrode layer, the touch electrode layer is disposed on a side of the substrate close to the photosensitive adhesive layer, or the touch electrode layer is disposed on a side of the substrate away from the photosensitive adhesive layer, the touch electrode layer comprises a plurality of touch electrodes, and the touch electrodes comprise at least one metal mesh.
8. The method of claim 7, wherein the irradiating the same layer of the photosensitive adhesive layer with ultraviolet light further comprises: and irradiating the same photosensitive adhesive layer from one side close to the substrate by using ultraviolet light.
9. The method for manufacturing a flexible display panel according to claim 8, further comprising, before the irradiating the same layer of the photosensitive adhesive layer from a side close to the substrate with ultraviolet light: and arranging a baffle on one side of the touch functional layer far away from the display functional layer.
10. The method of claim 9, wherein the flexible display panel comprises a plurality of sub-pixel opening areas arranged in an array, and wherein an orthogonal projection of the barrier on a plane of the flexible substrate overlaps an orthogonal projection of the sub-pixel opening areas on the plane of the flexible substrate.
11. A flexible display device comprising a flexible display panel according to any one of claims 1 to 5.
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| CN110144180B (en) * | 2019-04-29 | 2021-06-22 | 武汉华星光电半导体显示技术有限公司 | Panel bonding structure and panel bonding method |
| WO2020237518A1 (en) * | 2019-05-29 | 2020-12-03 | 深圳市柔宇科技有限公司 | Display device and preparation method therefor, and electronic apparatus |
| CN110264887A (en) * | 2019-07-01 | 2019-09-20 | 云谷（固安）科技有限公司 | A kind of flexible display screen and display device |
| WO2021007811A1 (en) * | 2019-07-17 | 2021-01-21 | 深圳市柔宇科技有限公司 | Flexible display apparatus, electronic device, and method for manufacturing flexible display apparatus |
| CN110690358A (en) * | 2019-09-05 | 2020-01-14 | 武汉华星光电半导体显示技术有限公司 | Display panel, display device and manufacturing method of display panel |
| US20220332989A1 (en) * | 2019-12-10 | 2022-10-20 | Lg Chem, Ltd. | Multi-region foldable adhesive film and fabrication method therefor |
| CN111445796B (en) * | 2020-04-02 | 2022-11-01 | 武汉华星光电半导体显示技术有限公司 | Display panel and flexible display device |
| CN111968504B (en) * | 2020-07-31 | 2022-04-19 | 合肥维信诺科技有限公司 | Display panel capable of being bent in solid state and display device |
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