CN111326540A - Display panel, preparation method of display panel and display device - Google Patents
Display panel, preparation method of display panel and display device Download PDFInfo
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- CN111326540A CN111326540A CN201811446743.6A CN201811446743A CN111326540A CN 111326540 A CN111326540 A CN 111326540A CN 201811446743 A CN201811446743 A CN 201811446743A CN 111326540 A CN111326540 A CN 111326540A
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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
- H10K59/40—OLEDs integrated with touch screens
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/822—Cathodes characterised by their shape
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention discloses a display panel, a preparation method of the display panel and a display device. The display panel includes: a substrate base plate; the organic light emitting device comprises a substrate, a plurality of independent organic light emitting units and a plurality of light emitting units, wherein the independent organic light emitting units are positioned on one side of the substrate, and each independent organic light emitting unit comprises an anode electrode, an organic light emitting material layer and a cathode electrode which are sequentially positioned on one side of the substrate; and the touch unit is positioned on one side of the organic light-emitting unit, which is far away from the substrate base plate, the touch unit comprises at least one layer of touch electrode, and at least part of the touch electrode is positioned between two adjacent independent organic light-emitting units and arranged on the same layer with the cathode electrode. The technical scheme provided by the embodiment of the invention can reduce the thickness of the display panel, reduce the reflection of the cathode electrode to visible light and improve the display effect of the display panel.
Description
Technical Field
The embodiment of the invention relates to the technical field of organic light emitting display, in particular to a display panel, a preparation method of the display panel and a display device.
Background
The existing display panel generally has touch and display functions, and the touch position detection is realized through a touch electrode in the display panel with the touch function.
At present, a cathode electrode in an Organic Light-Emitting Diode (OLED) device is generally a cathode electrode arranged in a whole layer, a touch electrode is arranged on the cathode electrode, and an insulating layer is also required to be arranged between the cathode electrode and the touch electrode, so that a display panel is thicker due to arrangement of more film layers, which is not beneficial to thinning of the display panel; meanwhile, the whole layer of cathode electrode can reflect the light incident on the cathode electrode, and the display effect of the display panel is affected.
Disclosure of Invention
The invention provides a display panel, a preparation method of the display panel and a display device, which aim to reduce the thickness of the display panel and reduce the reflection of a cathode electrode.
In a first aspect, an embodiment of the present invention provides a display panel, including:
a substrate base plate;
the organic light emitting device comprises a substrate, a plurality of independent organic light emitting units and a plurality of light emitting units, wherein the independent organic light emitting units are positioned on one side of the substrate, and each independent organic light emitting unit comprises an anode electrode, an organic light emitting material layer and a cathode electrode which are sequentially positioned on one side of the substrate;
and the touch unit is positioned on one side of the organic light-emitting unit, which is far away from the substrate base plate, and comprises at least one layer of touch electrode, and at least part of the touch electrode is positioned between two adjacent independent organic light-emitting units and arranged on the same layer with the cathode electrode.
Further, the touch unit comprises a self-contained touch unit;
the self-contained touch unit comprises a layer of touch electrode, and the touch electrode is positioned between two adjacent independent organic light-emitting units and arranged on the same layer with the cathode electrode.
Further, the touch unit comprises a mutual capacitance type touch unit;
the mutual capacitance type touch unit comprises a touch driving electrode and a touch sensing electrode which are arranged in a layered mode, and the touch driving electrode or the touch sensing electrode and the cathode electrode are arranged on the same layer.
Further, the touch unit comprises a mutual capacitance type touch unit;
the mutual capacitance type touch unit comprises a touch driving electrode and a touch sensing electrode which are arranged on the same layer, the touch driving electrode comprises a plurality of touch driving electrode plates, and two adjacent touch driving electrode plates are electrically connected through at least one touch driving bridge; the touch sensing electrodes comprise a plurality of touch sensing electrode plates, and two adjacent touch sensing electrode plates are electrically connected through at least one touch sensing bridge;
the touch driving bridge or the touch induction bridge and the cathode electrode are arranged on the same layer.
Further, the touch driving electrode, the touch sensing electrode and the cathode electrode are arranged on the same layer.
Furthermore, the display panel also comprises a thin film packaging layer positioned on one side of the cathode electrode, which is far away from the substrate;
the thin film encapsulation layer includes:
the first inorganic layer is positioned on one side of the cathode electrode, which is far away from the substrate base plate;
the organic flat layer is positioned on one side of the first inorganic layer, which is far away from the substrate base plate, and corresponds to the independent organic light-emitting unit;
the second inorganic layer is positioned on one side of the organic flat layer, which is far away from the substrate base plate, and the second inorganic layer covers the organic flat layer and the first inorganic layer;
wherein a perpendicular projection of the first inorganic layer and the second inorganic layer on the base substrate covers a perpendicular projection of at least one of the individual organic light emitting units on the base substrate.
Furthermore, the display panel further includes a plurality of cathode wires electrically connected to each other, and each cathode wire is electrically connected to each cathode electrode and is used for transmitting a cathode electrode signal to the cathode electrode.
In a second aspect, an embodiment of the present invention further provides a method for manufacturing a display panel, where the method for manufacturing a display panel includes:
providing a substrate base plate;
preparing a plurality of independent organic light-emitting units and touch units on one side of the substrate base plate; each independent organic light-emitting unit comprises an anode electrode, an organic light-emitting material layer and a cathode electrode which are sequentially positioned on one side of the substrate; the touch units comprise at least one layer of touch electrodes, and at least part of the touch electrodes are positioned between two adjacent independent organic light-emitting units and arranged in the same layer with the cathode electrodes.
Further, the preparing of the plurality of independent organic light emitting units and the touch unit on one side of the substrate includes:
preparing a plurality of anode electrodes which are independently arranged on one side of the substrate base plate;
preparing a plurality of independently arranged organic light-emitting material layers on one side of the anode electrode, which is far away from the substrate;
preparing a cathode metal layer arranged in a whole layer on one side of the organic light-emitting material layer away from the anode electrode;
and patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least part of touch electrodes positioned between two adjacent cathode electrodes.
Further, before patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least a portion of touch electrodes located between two adjacent cathode electrodes, the method further includes:
preparing a film packaging layer on one side of the cathode metal layer, which is far away from the substrate, wherein the film packaging layer comprises a first inorganic layer which is positioned on one side of the cathode metal layer, which is far away from the substrate, and the first inorganic layer is arranged on the whole layer; the organic flat layer is positioned on one side of the first inorganic layer, which is far away from the substrate base plate, and corresponds to the independent organic light-emitting unit; the second inorganic layer is positioned on one side of the organic flat layer, which is far away from the substrate base plate, and is arranged in a whole layer, and the second inorganic layer covers the organic flat layer and the first inorganic layer;
patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least part of touch electrodes positioned between two adjacent cathode electrodes, wherein the touch electrodes comprise a first electrode and a second electrode;
patterning the second inorganic layer and the first inorganic layer;
and patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least part of touch electrodes positioned between two adjacent cathode electrodes.
In a third aspect, an embodiment of the present invention further provides a display device, which includes the display panel of the first aspect.
According to the display panel provided by the embodiment of the invention, the plurality of independent organic light-emitting units are arranged, each independent organic light-emitting unit comprises the cathode electrode, at least part of the touch electrode is arranged between two adjacent independent organic light-emitting units and arranged in the same layer with the cathode electrode, and the cathode electrode and at least part of the touch electrode are arranged in the same layer, so that the film layer arrangement relationship of the display panel provided by the embodiment of the invention is simple, and the display panel is light and thin; meanwhile, each independent organic light-emitting unit comprises an independently arranged cathode electrode, and compared with the cathode electrode which is arranged in the whole layer in the prior art, the reflection of the cathode electrode to visible light can be reduced, and the display effect of the display panel is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display panel provided in the prior art;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a top view of a touch driving bridge or a touch sensing bridge and a cathode electrode disposed on the same layer in the display panel according to the embodiment of the invention;
fig. 4 is a schematic flowchart of a method for manufacturing a display panel according to an embodiment of the present invention;
fig. 5 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.
Fig. 1 is a schematic structural diagram of a display panel in the prior art, and as shown in fig. 1, the display panel includes an OLED device 10, an insulating layer 20, and a touch electrode 30, a cathode layer 11 in the OLED device 10 is disposed in a whole layer, the touch electrode 30 is disposed on the cathode layer 11, the insulating layer 20 is disposed on the cathode layer 11 and the touch electrode 30, and the display panel is thicker due to the arrangement of more film layers.
In view of the above technical problems, an embodiment of the present invention provides a display panel, including a substrate; the organic light emitting device comprises a substrate, a plurality of independent organic light emitting units and a plurality of light emitting units, wherein the independent organic light emitting units are positioned on one side of the substrate, and each independent organic light emitting unit comprises an anode electrode, an organic light emitting material layer and a cathode electrode which are sequentially positioned on one side of the substrate; and the touch unit is positioned on one side of the organic light-emitting unit, which is far away from the substrate base plate, the touch unit comprises at least one layer of touch electrode, and at least part of the touch electrode is positioned between two adjacent independent organic light-emitting units and arranged on the same layer with the cathode electrode. By adopting the technical scheme, the plurality of independent organic light-emitting units are arranged, each independent organic light-emitting unit comprises the cathode electrode which is independently arranged, at least part of the touch electrode is arranged between two adjacent independent organic light-emitting units and arranged at the same layer as the cathode electrode, and the cathode electrode and at least part of the touch electrode are arranged at the same layer, so that the film layer arrangement relation of the display panel provided by the embodiment of the invention is simple, and the display panel is light and thin; meanwhile, each independent organic light-emitting unit comprises an independently arranged cathode electrode, and compared with the cathode electrode which is arranged in the whole layer in the prior art, the reflection of the cathode electrode to visible light can be reduced, and the display effect of the display panel is 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 display panel according to an embodiment of the present invention, where the display panel includes: a base substrate 100; a plurality of independent organic light emitting units 200 on one side of the substrate 100, each of the independent organic light emitting units 200 including an anode electrode (not shown in the drawing), an organic light emitting material layer 201, and a cathode electrode 202 in this order on one side of the substrate 100; the touch unit 300 is located on a side of the organic light emitting units 200 away from the substrate 100, and the touch unit 300 includes at least one layer of touch electrode, and at least a portion of the touch electrode is located between two adjacent independent organic light emitting units 200 and is located on the same layer as the cathode electrode 202.
It should be noted that, in order to clearly show the differences between the display panel in the present embodiment and the display panel in the background art, different reference numerals are used for the components of the display panel in the present embodiment and the display panel in the background art with the same name.
In this embodiment, the substrate 100 may be a rigid substrate or a flexible substrate, wherein the rigid substrate may be made of glass, the flexible substrate may be made of polyimide, and the thickness of the substrate 100 may be set according to process requirements, product requirements, and the like. Compared with the prior art, the independent organic light emitting unit 200 includes an anode electrode (not shown), an organic light emitting material layer 201, and a cathode electrode 202, and the cathode electrode 202 is independently disposed, and may be disposed in only one sub-pixel, or may be disposed in a plurality of sub-pixels, rather than being disposed in a whole layer, and fig. 2 illustrates that only the cathode electrode 300 is disposed in one sub-pixel.
It should be noted that the touch unit 300 may include one layer of touch electrode, or may include two layers of touch electrodes, and when the touch unit 300 is a layer of touch electrode, the touch electrodes may be all located between two adjacent independent organic light emitting units 200 and disposed on the same layer as the cathode electrode 202, or a bridging portion of the touch electrode is located between two adjacent independent organic light emitting units 200 and disposed on the same layer as the cathode electrode 202, but the touch electrode is located on a side of the organic light emitting unit 200 away from the substrate 100, or a portion of the touch electrode is located between two adjacent independent organic light emitting units 200 and disposed on the same layer as the cathode electrode 202, but a bridging of the touch electrode is located on a side of the organic light emitting unit 200 away from the substrate 100. When the touch unit 300 is two layers of touch electrodes, one layer of touch electrode is located on one side of the organic light emitting unit 200 away from the substrate 100, and the other layer of touch electrode is located between two adjacent independent organic light emitting units 200 and is disposed on the same layer as the cathode electrode 300. In summary, the touch unit 300 may be located on a side of the organic light emitting unit 200 away from the substrate 100, or may be located in a cathode layer of the organic light emitting unit 200. Fig. 2 illustrates only that at least a portion of the touch electrode 400 is located between two adjacent independent organic light emitting units and is disposed at the same layer as the cathode electrode 202.
In the display panel provided by the technical scheme of this embodiment, by arranging a plurality of independent organic light emitting units, each independent organic light emitting unit includes a cathode electrode, and at least part of a touch electrode is arranged between two adjacent independent organic light emitting units and arranged in the same layer as the cathode electrode, and by arranging the cathode electrode and at least part of the touch electrode in the same layer, the display panel provided by the embodiment of the invention is ensured to have a simple film layer arrangement relationship, thereby solving the problem that in the prior art, the touch electrode is arranged on the cathode electrode, an insulating layer is also required to be arranged between the cathode electrode and the touch electrode, and the display panel is thicker due to more film layers, which is beneficial to realizing the lightness and thinness of the display panel, and meanwhile, each independent organic light emitting unit includes an independently arranged cathode electrode, compared with the cathode electrode arranged in the whole layer in the prior art, the reflection of the cathode electrode to visible light can be reduced, and the display effect of the display panel is improved.
On the basis of the above technical solution, the touch unit 300 may be a self-contained touch unit or a mutual-contained touch unit; when the touch unit 300 is a mutual capacitive touch unit, the touch driving electrodes and the touch sensing electrodes may be located on the same film layer or on different film layers. The different cases will be explained in detail below.
Optionally, the touch unit 300 includes a self-contained touch unit; the self-contained touch unit includes a layer of touch electrode, and the touch electrode is located between two adjacent independent organic light emitting units and is disposed on the same layer as the cathode electrode 202.
When the touch unit 300 is a self-contained touch unit, the touch unit 300 includes a layer of touch electrodes, and the touch unit 300 is disposed between two adjacent independent organic light emitting units and disposed on the same layer as the cathode electrode 202. The touch unit 300 is located between two independent organic light emitting units and disposed on the same layer as the cathode electrode 202, so that the thickness of the display panel is reduced.
In the present embodiment, the touch electrodes serve as both the touch driving electrodes and the touch sensing electrodes. When in the touch stage, the touch driving signals are sequentially input into the touch electrodes, and the signals on the touch electrodes are detected. When a touch event occurs, each touch electrode is coupled with the human body capacitor, so that the capacitance of the touch electrode is changed. And determining the capacitance variation of the touch electrodes according to the received signals on the touch electrodes, and further determining the touch position.
Optionally, the touch unit 300 may include a mutual-capacitive touch unit; the mutual capacitance type touch unit comprises a touch driving electrode and a touch sensing electrode which are arranged in a layered mode, and the touch driving electrode or the touch sensing electrode and the cathode electrode are arranged on the same layer.
When the touch unit 300 is a mutual capacitive touch unit, the touch unit 300 includes touch driving electrodes and touch sensing electrodes, and the touch driving electrodes and the touch sensing electrodes are layered, and at this time, because one of the electrodes, such as the touch driving electrodes, is disposed on the same layer as the cathode electrode, and the other electrode, such as the touch sensing electrode, is disposed in the other film layer, the thickness of the display panel is reduced compared with the case where the touch driving electrodes and the touch sensing electrodes, which are layered in the prior art, are disposed in the other film layer.
In this embodiment, in the touch stage, the touch driving electrodes are sequentially input with a touch driving signal, the touch sensing electrodes output a detection signal, and when a touch event occurs, the touch driving electrodes are coupled with the touch sensing electrodes, so as to change the capacitance between the touch driving electrodes and the touch sensing electrodes. And determining the variation of the capacitance according to the received detection signals output by the touch sensing electrodes, and further determining the touch position.
Optionally, the touch unit 300 may include a mutual capacitance type touch unit, where the mutual capacitance type touch unit includes a touch driving electrode and a touch sensing electrode that are disposed on the same layer, and fig. 3 is a top view of a display panel provided in an embodiment of the present invention, where the touch driving bridge or the touch sensing bridge and the cathode electrode are disposed on the same layer, and as shown in fig. 3, the touch driving electrode includes a plurality of touch driving electrode pads 301, and two adjacent touch driving electrode pads 301 are electrically connected through at least one touch driving bridge 302; the touch sensing electrode comprises a plurality of touch sensing electrode pieces 303, and two adjacent touch sensing electrode pieces are electrically connected through at least one touch sensing bridge 304, wherein the touch driving bridge 302 or the touch sensing bridge 304 and the cathode electrode 202 are arranged in the same layer.
When the touch driving electrodes and the touch sensing electrodes are disposed on the same layer, the touch driving bridge 302 and the touch sensing bridge 304 have crossed portions, and the crossed portions of the touch driving bridge 302 and the touch sensing bridge 304 are exemplarily shown by dashed boxes in fig. 3. If the touch driving bridge 302 and the touch sensing bridge 304 intersect, the touch effect is affected, and at this time, the touch driving bridge 302 or the touch sensing bridge 304 needs to be disposed at a position different from the position of the touch driving electrode and the position of the touch sensing electrode at a different layer.
It should be noted that two adjacent touch drive electrode pads 301 may be electrically connected through one touch drive bridge 302, or may be electrically connected through a plurality of touch drive bridges 302, when two adjacent touch drive electrode pads 301 are electrically connected through one touch drive bridge 302, the number of contact points between the touch drive bridge 302 and the two touch drive electrode pads 301 is two, when two adjacent touch drive electrode pads 301 are electrically connected through the plurality of touch drive bridges 302, the number of contact points between the touch drive bridge 302 and the two touch drive electrode pads 301 is more than two, and the contact impedance is higher the more the contact points are, in this embodiment, preferably, two adjacent touch drive electrode pads 301 may be electrically connected through two touch drive bridges 302 (not shown in the figure), when one of the two contacts is disconnected, the electrical connection between the two adjacent touch drive electrode pads 301 is not affected, and at the same time, the impedance between the touch drive electrode pads, and touch sensitivity is improved.
Alternatively, the touch driving electrode and the touch sensing electrode may be disposed in the same layer as the cathode electrode (not shown in the figure).
If the touch driving electrode, the touch sensing electrode and the cathode electrode are disposed on the same layer, at this time, the touch driving bridge or the touch sensing bridge needs to be disposed in another film layer on a different layer from the touch driving electrode and the touch sensing electrode. In this embodiment, the touch driving electrodes and the touch sensing electrodes are disposed on the same layer as the cathode electrode, and the touch driving bridges or the touch sensing bridges are disposed in other film layers, so that the thickness of the display panel is reduced compared with the case where the touch driving electrodes and the touch sensing electrodes are also disposed in other film layers.
On the basis of the above technical solution, optionally, the display panel further includes a thin film encapsulation layer 400 located on one side of the cathode electrode 202 away from the substrate 100; the thin film encapsulation layer 400 includes: a first inorganic layer 401 on the side of the cathode electrode 202 away from the base substrate 100; an organic planarization layer 402 located on the first inorganic layer 401 away from the substrate 100 and corresponding to the individual organic light emitting units 200; a second inorganic layer 403 positioned on the side of the organic planarization layer 402 away from the substrate 100, the second inorganic layer 403 covering the organic planarization layer 502 and the first inorganic layer 401; wherein the perpendicular projection of the first inorganic layer 401 and the second inorganic layer 403 on the substrate base plate 100 covers the perpendicular projection of the at least one individual organic light emitting unit 200 on the substrate base plate 100.
The thin film encapsulation layer 400 may encapsulate one organic light emitting unit 200 or a plurality of organic light emitting units 200, and with reference to fig. 2, fig. 2 only exemplarily shows that the thin film encapsulation layer 400 encapsulates only one independent organic light emitting unit 200. According to the thin film encapsulation layer in the display panel provided by the embodiment of the invention, the inorganic layer has strong blocking capability, such as blocking water and oxygen, so that the organic light-emitting unit can be prevented from being influenced by water and oxygen, and the service life of the organic light-emitting unit is prolonged. In this embodiment, when the thin film encapsulation layer includes an organic layer and two inorganic layers, moisture and oxygen can be further prevented from entering the organic light emitting device, so as to improve the lifetime of the organic light emitting device and ensure reliable encapsulation.
On the basis of the above technical solution, optionally, the display panel further includes a plurality of cathode wires electrically connected to each other, and each cathode wire is electrically connected to each cathode electrode and is used for transmitting a cathode electrode signal to the cathode electrode.
For example, since the display panel provided in the embodiment of the present invention includes a plurality of cathode electrodes that are independently arranged, in order to ensure that each cathode electrode can receive a cathode electrode signal, the display panel provided in the embodiment of the present invention further includes a plurality of cathode traces, and each cathode trace is electrically connected to each cathode electrode and is used for transmitting a cathode electrode signal to the cathode electrode. Meanwhile, the plurality of cathode wires provided by the embodiment of the invention are electrically connected with each other, so that only one cathode wire is required to be electrically connected with the driving circuit, and a cathode electrode signal provided by the driving circuit is received, and each cathode wire is not required to be electrically connected with the driving circuit, so that the cathode wires of the display panel are simple to set, and the pins of the driving circuit are simple to set.
Based on the same inventive concept, the embodiment of the invention also provides a preparation method of the display panel, which can be used for preparing the display panel shown in fig. 2. Referring to fig. 4, the method includes:
s110, providing a substrate.
S120, preparing a plurality of independent organic light-emitting units and touch units on one side of a substrate; each independent organic light-emitting unit comprises an anode electrode, an organic light-emitting material layer and a cathode electrode which are sequentially positioned on one side of the substrate; the touch units comprise at least one layer of touch electrodes, and at least part of the touch electrodes are positioned between two adjacent independent organic light-emitting units and arranged in the same layer with the cathode electrodes.
The organic light emitting device comprises a substrate, a plurality of independent organic light emitting units and an organic light emitting layer, wherein the independent organic light emitting units can be formed on the substrate through processes such as evaporation or sputtering, specifically, an anode electrode of an organic light emitting element is formed through evaporation or sputtering, and after the anode electrode is formed, the organic light emitting layer and a cathode electrode can be formed on one side, away from the substrate, of the anode electrode through processes such as evaporation or sputtering.
In the method for manufacturing a display panel according to the present embodiment, a plurality of independent organic light emitting units and a plurality of touch units are manufactured on one side of a substrate, each independent organic light emitting unit includes a cathode electrode, at least a portion of a touch electrode is disposed between two adjacent independent organic light emitting units and disposed on the same layer as the cathode electrode, and the cathode electrode and at least a portion of the touch electrode are disposed on the same layer, so that the film layer of the display panel provided in the embodiment of the present invention is simple in arrangement relationship, the problem that the display panel is thick due to the fact that the touch electrode is disposed on the cathode electrode, an insulating layer is further required to be disposed between the cathode electrode and the touch electrode, and many film layers are disposed is solved, thereby facilitating the realization of the thinning of the display panel, and each independent organic light emitting unit includes an independently disposed cathode electrode, compared with the cathode electrode which is arranged in the whole layer in the prior art, the reflection of the cathode electrode to visible light can be reduced, and the display effect of the display panel is improved.
On the basis of the above technical solution, optionally, the preparing a plurality of independent organic light emitting units and touch units on one side of the substrate includes: preparing a plurality of anode electrodes which are independently arranged on one side of a substrate; preparing a plurality of independently arranged organic light-emitting material layers on one side of the anode electrode, which is far away from the substrate; preparing a cathode metal layer arranged on the whole layer on one side of the organic light-emitting material layer away from the anode electrode; and patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least part of touch electrodes positioned between two adjacent cathode electrodes.
After a plurality of independently arranged anode electrodes and a plurality of independently arranged organic light emitting material layers are prepared on one side of a substrate, a cathode metal layer arranged on the whole layer is prepared on one side of the organic light emitting material layer away from the anode electrodes, and then the cathode metal layer can be subjected to patterning treatment through processes such as etching and the like, so that a plurality of cathode electrodes and at least part of touch electrodes positioned between two adjacent cathode electrodes are obtained.
On the basis of the foregoing technical solution, optionally, before patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least a portion of the touch electrodes located between two adjacent cathode electrodes, the method further includes: preparing a film packaging layer on one side of the cathode metal layer far away from the substrate, wherein the film packaging layer comprises a first inorganic layer which is positioned on one side of the cathode metal layer far away from the substrate and is entirely provided with the first inorganic layer; the organic flat layer is positioned on one side of the first inorganic layer, which is far away from the substrate base plate and corresponds to the independent organic light-emitting unit; the second inorganic layer is positioned on one side of the organic flat layer, which is far away from the substrate base plate, and is arranged in a whole layer manner, and the second inorganic layer covers the organic flat layer and the first inorganic layer; patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least part of touch electrodes positioned between two adjacent cathode electrodes, wherein the touch electrodes comprise a first electrode and a second electrode; patterning the second inorganic layer and the first inorganic layer; the cathode metal layer is patterned to obtain a plurality of cathode electrodes and at least a portion of the touch electrode located between two adjacent cathode electrodes 202.
The inorganic layer in the thin film encapsulation layer can be formed by a film forming deposition or evaporation process, and the inorganic layer can comprise a deposition layer formed by one or more of metal oxide and metal nitride. More specifically, the inorganic layer may include SiNx, Al2O3、SiO2And TiO2A deposited layer formed of one material or a deposited layer formed of a plurality of materials. In this embodiment, a first inorganic layer is prepared on a side of the cathode metal layer away from the substrate, and then an organic planarization layer is prepared, for example, by an inkjet printing process, where the organic planarization layer is located on a side of the first inorganic layer away from the substrate and corresponds to the independent organic light emitting unit, and then an inorganic layer, that is, a second inorganic layer is prepared. The second inorganic layer and the first inorganic layer may be etched, for example, by an etching process to expose the cathode metal layer, and then the cathode may be etched, for example, by an etching processAnd the metal layer is arranged on the electrode, so that a plurality of cathode electrodes and at least part of touch electrodes positioned between two adjacent cathode electrodes are obtained. It should be noted that, as can be understood by those skilled in the art, the processes for patterning the second inorganic layer, the first inorganic layer and the cathode metal layer include, but are not limited to, an etching process, and those skilled in the art can select the patterning process according to the product requirement, and the invention is not limited thereto.
The embodiment of the invention also provides a display device, and fig. 5 is a schematic structural diagram of the display device provided by the embodiment of the invention. Referring to fig. 5, the display device 1000 includes the display panel 1 according to the embodiment of the present invention. The display device 1000 may be a mobile phone, a computer, an intelligent wearable device, and the like.
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 (11)
1. A display panel, comprising:
a substrate base plate;
the organic light emitting device comprises a substrate, a plurality of independent organic light emitting units and a plurality of light emitting units, wherein the independent organic light emitting units are positioned on one side of the substrate, and each independent organic light emitting unit comprises an anode electrode, an organic light emitting material layer and a cathode electrode which are sequentially positioned on one side of the substrate;
and the touch unit is positioned on one side of the organic light-emitting unit, which is far away from the substrate base plate, and comprises at least one layer of touch electrode, and at least part of the touch electrode is positioned between two adjacent independent organic light-emitting units and arranged on the same layer with the cathode electrode.
2. The display panel of claim 1, wherein the touch unit comprises a self-contained touch unit;
the self-contained touch unit comprises a layer of touch electrode, and the touch electrode is positioned between two adjacent independent organic light-emitting units and arranged on the same layer with the cathode electrode.
3. The display panel of claim 1, wherein the touch unit comprises a mutually-capacitive touch unit;
the mutual capacitance type touch unit comprises a touch driving electrode and a touch sensing electrode which are arranged in a layered mode, and the touch driving electrode or the touch sensing electrode and the cathode electrode are arranged on the same layer.
4. The display panel of claim 1, wherein the touch unit comprises a mutually-capacitive touch unit;
the mutual capacitance type touch unit comprises a touch driving electrode and a touch sensing electrode which are arranged on the same layer, the touch driving electrode comprises a plurality of touch driving electrode plates, and two adjacent touch driving electrode plates are electrically connected through at least one touch driving bridge; the touch sensing electrodes comprise a plurality of touch sensing electrode plates, and two adjacent touch sensing electrode plates are electrically connected through at least one touch sensing bridge;
the touch driving bridge or the touch induction bridge and the cathode electrode are arranged on the same layer.
5. The display panel according to claim 4, wherein the touch driving electrode and the touch sensing electrode are disposed on the same layer as the cathode electrode.
6. The display panel according to claim 1, further comprising a thin film encapsulation layer on a side of the cathode electrode away from the substrate base plate;
the thin film encapsulation layer includes:
the first inorganic layer is positioned on one side of the cathode electrode, which is far away from the substrate base plate;
the organic flat layer is positioned on one side of the first inorganic layer, which is far away from the substrate base plate, and corresponds to the independent organic light-emitting unit;
the second inorganic layer is positioned on one side of the organic flat layer, which is far away from the substrate base plate, and the second inorganic layer covers the organic flat layer and the first inorganic layer;
wherein a perpendicular projection of the first inorganic layer and the second inorganic layer on the base substrate covers a perpendicular projection of at least one of the individual organic light emitting units on the base substrate.
7. The display panel of claim 1, further comprising a plurality of cathode traces electrically connected to each other, wherein each cathode trace is electrically connected to each cathode electrode for transmitting a cathode electrode signal to the cathode electrode.
8. A method for manufacturing a display panel, comprising:
providing a substrate base plate;
preparing a plurality of independent organic light-emitting units and touch units on one side of the substrate base plate; each independent organic light-emitting unit comprises an anode electrode, an organic light-emitting material layer and a cathode electrode which are sequentially positioned on one side of the substrate; the touch units comprise at least one layer of touch electrodes, and at least part of the touch electrodes are positioned between two adjacent independent organic light-emitting units and arranged in the same layer with the cathode electrodes.
9. The method of claim 8, wherein the fabricating a plurality of independent organic light emitting units and touch units on one side of the substrate comprises:
preparing a plurality of anode electrodes which are independently arranged on one side of the substrate base plate;
preparing a plurality of independently arranged organic light-emitting material layers on one side of the anode electrode, which is far away from the substrate;
preparing a cathode metal layer arranged in a whole layer on one side of the organic light-emitting material layer away from the anode electrode;
and patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least part of touch electrodes positioned between two adjacent cathode electrodes.
10. The method of claim 9, wherein patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least a portion of the touch electrode between two adjacent cathode electrodes further comprises:
preparing a film packaging layer on one side of the cathode metal layer, which is far away from the substrate, wherein the film packaging layer comprises a first inorganic layer which is positioned on one side of the cathode metal layer, which is far away from the substrate, and the first inorganic layer is arranged on the whole layer; the organic flat layer is positioned on one side of the first inorganic layer, which is far away from the substrate base plate, and corresponds to the independent organic light-emitting unit; the second inorganic layer is positioned on one side of the organic flat layer, which is far away from the substrate base plate, and is arranged in a whole layer, and the second inorganic layer covers the organic flat layer and the first inorganic layer;
patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least part of touch electrodes positioned between two adjacent cathode electrodes, wherein the touch electrodes comprise a first electrode and a second electrode;
patterning the second inorganic layer and the first inorganic layer;
and patterning the cathode metal layer to obtain a plurality of cathode electrodes and at least part of touch electrodes positioned between two adjacent cathode electrodes.
11. A display device characterized by comprising the display panel according to any one of claims 1 to 7.
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| CN111326540B (en) | 2023-08-22 |
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