CN109599426B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN109599426B CN109599426B CN201811507586.5A CN201811507586A CN109599426B CN 109599426 B CN109599426 B CN 109599426B CN 201811507586 A CN201811507586 A CN 201811507586A CN 109599426 B CN109599426 B CN 109599426B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/8723—Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
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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
- H10K59/12—Active-matrix OLED [AMOLED] displays
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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
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/805—Electrodes
- H10K59/8052—Cathodes
- H10K59/80521—Cathodes characterised by their shape
Abstract
The embodiment of the invention provides a display panel and a display device, relates to the technical field of display, and aims to solve the problem of mutual crosstalk between different sub-pixels when an OLED display panel displays in the prior art. The display panel comprises a first substrate, a second substrate and a plurality of light-emitting devices, wherein the first substrate and the second substrate are oppositely arranged, and the light-emitting devices are positioned on one side of the first substrate facing the second substrate; the light-emitting device includes a first electrode, a light-emitting layer, a common layer, and a second electrode which are arranged in a stacked manner; the common layer is positioned on one side of the light-emitting layer facing the first electrode and/or the second electrode; the display panel further includes an auxiliary electrode in contact with the common layer between the adjacent two light emitting layers.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a display panel and a display device.
[ background of the invention ]
An Organic Light-Emitting Diode (OLED) display panel is widely used in the display technology field because of its advantages of active Light emission, high contrast, no viewing angle limitation, and the like.
In the OLED display panel, in order to enhance the carrier transfer and recombination efficiency, functional film layers such as an electron transport layer, an electron injection layer, a hole transport layer, and a hole injection layer are generally disposed between an electrode and a light emitting layer of an OLED device. However, since these functional film layers usually cover the whole surface of all the organic light emitting devices in the display panel, when the display panel displays, in addition to the normal process of the carriers moving from the respective cathode and/or anode to the corresponding light emitting layer in the longitudinal direction, the carriers may also move laterally between different OLED devices through the functional film layers, that is, lateral leakage current occurs, which causes a problem of crosstalk between different sub-pixels when the display panel displays, for example, a phenomenon that the sub-pixel which should not emit light emits light may occur, and the display effect is affected.
[ summary of the invention ]
In view of the above, embodiments of the present invention provide a display panel and a display device, so as to solve the problem of mutual crosstalk between different sub-pixels when an OLED display panel displays in the prior art.
In one aspect, an embodiment of the present invention provides a display panel, including:
the first substrate and the second substrate are oppositely arranged;
a plurality of light emitting devices on a side of the first substrate facing the second substrate; the light-emitting device comprises a first electrode, a light-emitting layer, a common layer and a second electrode which are arranged in a stacked manner; the common layer is positioned on one side of the light-emitting layer facing the first electrode and/or the second electrode;
and the auxiliary electrode is connected with a negative potential and is in contact with the common layer between two adjacent light-emitting layers.
On the other hand, the embodiment of the invention also provides a display device, which comprises the display panel.
According to the display panel and the display device provided by the embodiment of the invention, the auxiliary electrode which is in contact with the common layer between the two adjacent light emitting layers is arranged, and the auxiliary electrode is electrically connected with the negative potential, so that in the working process of the display panel, when transverse leakage current occurs, namely, a current carrier of a certain light emitting device transversely migrates from the light emitting device to the rest of the light emitting devices through the common layer, the transversely migrated current carrier can be guided away through the auxiliary electrode connected with the negative potential, thereby avoiding the migration of the current carrier between different light emitting devices, namely avoiding the problem of mutual crosstalk of the light emitting devices during working, and improving the display effect of the display panel.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of a prior art display panel;
fig. 2 is a schematic top view of a display panel according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view along AA' of FIG. 2;
FIG. 4 is a schematic top view of another display panel provided in accordance with an embodiment of the present invention;
FIG. 5 is another schematic cross-sectional view along AA' of FIG. 2;
FIG. 6 is a further schematic cross-sectional view along AA' of FIG. 2;
FIG. 7 is a further schematic cross-sectional view along AA' of FIG. 2;
FIG. 8 is a schematic top view of another display panel provided in accordance with an embodiment of the present invention;
FIG. 9 is an enlarged schematic view of FIG. 8 at a location corresponding to a sub-pixel size of 4 × 4;
FIG. 10 is a schematic cross-sectional view along BB' of FIG. 9;
FIG. 11 is another enlarged schematic view of FIG. 8 at a location corresponding to a sub-pixel size of 4 × 4;
FIG. 12 is a schematic cross-sectional view taken along line CC' of FIG. 11
FIG. 13 is another schematic cross-sectional view taken along BB' of FIG. 9;
FIG. 14 is a further schematic cross-sectional view along BB' of FIG. 9;
fig. 15 is a schematic diagram of a display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe the auxiliary electrodes in the embodiments of the present invention, the auxiliary electrodes should not be limited to these terms. These terms are only used to distinguish the auxiliary electrodes from each other. For example, the first auxiliary electrode may also be referred to as a second auxiliary electrode, and similarly, the second auxiliary electrode may also be referred to as a first auxiliary electrode without departing from the scope of embodiments of the present invention.
As shown in fig. 1, fig. 1 is a schematic cross-sectional view of a display panel in the prior art, wherein the display panel includes a plurality of organic light emitting devices, and in fig. 1, a first organic light emitting device 1 ' and a second organic light emitting device 2 ' are taken as an example, each organic light emitting device includes an anode 11 ', a light emitting layer 10 ', and a cathode 12 ' which are stacked. When the organic light emitting device needs to emit light, an electrical signal is provided to the anode 11 ' and the cathode 12 ' of the organic light emitting device 1 ', holes generated by the anode 11 ' are injected into the light emitting layer 10 ' under the action of the voltage difference between the anode 11 ' and the cathode 12 ', electrons generated by the cathode 12 ' are also injected into the light emitting layer 10 ', the electrons and the holes are recombined in the light emitting layer 10 ' to generate excitons, and the exciton radiation is transited from an excited state to a ground state, so that the light emitting layer 10 ' emits light of a corresponding color. When the organic light emitting device does not need to emit light, the voltage difference between the anode 11 ' and the cathode 12 ' of the organic light emitting device is 0, carriers including electrons and holes do not move from the anode 11 ' and the cathode 12 ' to the light emitting layer 10 ', and accordingly, no exciton is generated in the light emitting layer 10 ', so that the light emitting layer 10 ' does not emit light.
Currently, in order to improve the carrier transport and recombination efficiency, as shown in fig. 1, a hole injection layer 13 'and a hole transport layer 14' are generally disposed between an anode 11 'and a light emitting layer 10', and an electron injection layer 15 'and an electron transport layer 16' are disposed between a cathode 12 'and the light emitting layer 10'. However, since the functional film layer including the hole injection layer 13 ', the hole transport layer 14', the electron injection layer 15 ', and the electron transport layer 16' is generally a planar structure covering each organic light emitting device, if it is necessary to make the first organic light emitting device 1 'in a light emitting state and the second organic light emitting device 2' in a non-light emitting state at a certain time as shown in fig. 1, the anode 11 'and the cathode 12' included in the first organic light emitting device 1 'receive electric signals at the time and the anode 11' and the cathode 12 'included in the second organic light emitting device 2' do not receive electric signals at the time. The hole injection layer 13 ', the hole transport layer 14 ', the electron injection layer 15 ', and the electron transport layer 16 ' corresponding to the first organic light emitting device 1 ' have carriers passing therethrough, and migrate into the light emitting layer 10 ' included in the first organic light emitting device 1 '. However, since the common film layers such as the hole injection layer 13 ', the hole transport layer 14 ', the electron injection layer 15 ' and the electron transport layer 16 ' between the first organic light emitting device 1 ' and the second organic light emitting device 2 ' are communicated with each other, carriers may migrate from the first organic light emitting device 1 ' to the second organic light emitting device 2 ' through the common film layers, so that the second organic light emitting device 2 ' that should not emit light may also emit light, that is, a problem of crosstalk between the first organic light emitting device 1 ' and the second organic light emitting device 2 ' may occur.
In view of this, an embodiment of the present invention provides a display panel, as shown in fig. 2 and fig. 3, fig. 2 is a schematic top view of the display panel provided in the embodiment of the present invention, and fig. 3 is a schematic cross-sectional view along AA' of fig. 2, wherein the display panel includes a first substrate 1 and a second substrate 2 disposed opposite to each other, and a light emitting device 3 located on a side of the first substrate 1 facing the second substrate 2. Specifically, the light-emitting device 3 includes a first electrode 31, a light-emitting layer 30, a common layer 33, and a second electrode 32, which are stacked; the common layer 33 is located on the side of the light-emitting layer 30 facing the first electrode 31 and/or the second electrode 32; the display panel further includes an auxiliary electrode 4, the auxiliary electrode 4 is connected to a negative potential, and the auxiliary electrode 4 is in contact with the common layer 33 between the adjacent two light emitting layers 30.
Illustratively, the first electrode 31 may be an anode, the second electrode 32 may be a cathode, and accordingly, the common layer 33 on the side of the light emitting layer 30 facing the first electrode 31 may include a hole injection layer and a hole transport layer, and the common layer 33 on the side of the light emitting layer 30 facing the second electrode 32 may include an electron injection layer and an electron transport layer.
In the display panel provided by the embodiment of the invention, the auxiliary electrode 4 in contact with the common layer 33 between the two adjacent light emitting layers 30 is arranged, and the auxiliary electrode 4 is electrically connected with the negative potential, so that in the working process of the display panel, when a transverse leakage current occurs, namely, carriers of a certain light emitting device transversely migrate from the light emitting device to the rest light emitting devices through the common layer 33, the transversely migrated carriers can be guided away through the auxiliary electrode 4 connected with the negative potential, as shown in an arrow direction in fig. 3, the flow direction of the carriers is shown, so that the carriers are prevented from migrating among different light emitting devices, that is, the problem of mutual crosstalk of the light emitting devices during working is avoided, and the display effect of the display panel is improved.
Exemplarily, as shown in fig. 3, the orthographic projection of the auxiliary electrode 4 on the plane of the display panel is not overlapped with the orthographic projection of the light-emitting layer 30 on the plane of the display panel, so as to avoid the auxiliary electrode 4 from affecting the light emitted by the light-emitting layer 30, and ensure the normal light emission of the light-emitting layer 30.
Illustratively, as shown in fig. 2 and 3, the display panel further includes a support column 5; the supporting columns 5 are positioned between the first substrate 1 and the second substrate 2; the auxiliary electrode 4 overlaps with the supporting column 5 in the orthographic projection of the display panel. In the embodiment of the invention, the support columns 5 are arranged in the display panel, so that when the light-emitting layer 30 in the display panel is evaporated, the support columns 5 can be used for supporting a mask plate required in evaporation. In addition, in the embodiment of the invention, the supporting columns 5 are arranged between two adjacent light-emitting layers 30, so that the light emitted by the light-emitting layers 30 is prevented from being shielded by the supporting columns 5. On the basis, the projection of the auxiliary electrode 4 and the support pillar 5 on the plane of the display panel is overlapped, so that the extra large space between two adjacent light-emitting layers 30 can be avoided on the basis of ensuring that the auxiliary electrode 4 and the support pillar 5 do not influence the normal light emission of the light-emitting layers 30, and the aperture ratio of the display panel is not reduced.
Illustratively, the auxiliary electrode 4 may be designed in various shapes on the basis of ensuring that the auxiliary electrode 4 does not overlap the light-emitting layer 30. For example, as shown in fig. 2, wherein the auxiliary electrode 4 is in the shape of a grid. Alternatively, as shown in fig. 4, fig. 4 is a schematic top view of another display panel provided in the embodiment of the present invention, wherein the auxiliary electrode 4 may also be designed to be a strip. Of course, the shape of the auxiliary electrode 4 may also be designed as a mixture of a strip shape and a grid shape, as long as the auxiliary electrode 4 is ensured not to overlap with the light-emitting layer 30, and those skilled in the art can make corresponding adjustments according to different design requirements.
For example, the position of the auxiliary electrode 4 in the display panel may be designed in various ways on the basis of ensuring that the auxiliary electrode 4 is in contact with the common layer 33 between two adjacent light-emitting layers 30, for example, the auxiliary electrode 4 may be in contact with the side of the common layer 33 close to the second substrate 2, or the auxiliary electrode 4 may be in contact with the side of the common layer 33 close to the first substrate 1, which will be described below.
As shown in fig. 3, when the auxiliary electrode 4 is disposed in contact with the side of the common layer 33 close to the second substrate 2, the embodiment of the invention may pattern the second electrode 32 to be a strip-shaped or block-shaped structure, that is, only the second electrode 32 covers the corresponding light-emitting layer 30, and the auxiliary electrode 4 is disposed between the adjacent light-emitting layers 30, that is, the auxiliary electrode 4 and the second electrode 32 are not connected to each other. At this time, the signals on the auxiliary electrode 4 and the second electrode 32 are independent from each other, so the auxiliary electrode 4 can be connected to a potential lower than the potential of the second electrode 32, for example, the potential of the auxiliary electrode 4 can be between-7V and-3V, and the auxiliary electrode 4 is connected to a low-level signal terminal VGL (not shown) or a reference voltage signal terminal Vref (not shown) existing in the display panel, so as to better improve the lateral leakage current phenomenon.
On the basis of making the second electrode 32 only cover the corresponding light emitting layer 30, exemplarily, as shown in fig. 5, fig. 5 is another schematic cross-sectional view along AA' of fig. 2, wherein the auxiliary electrode 4 includes a first auxiliary electrode 41 and a second auxiliary electrode 42, and the first auxiliary electrode 41 and the second auxiliary electrode 42 are electrically connected; the second auxiliary electrode 42 is in contact with a side of the common layer 33 close to the second substrate 2, or the second auxiliary electrode 42 may be pressed into the common layer 33 to be in contact with the common layer 33 by applying pressure to the second auxiliary electrode 42; the orthographic projection of the first auxiliary electrode 41 and the second auxiliary electrode 42 on the plane of the display panel is not overlapped with the orthographic projection of the light-emitting layer 30 on the plane of the display panel. When a lateral leakage phenomenon occurs, carriers can flow to a lower potential position sequentially through the second auxiliary electrode 42 and the first auxiliary electrode 41, as shown in the arrow direction in fig. 5, the flow direction of the carriers is indicated, so that the carriers are prevented from migrating between different light emitting devices 3, that is, the problem of mutual crosstalk of the light emitting devices 3 during operation is avoided, and the display effect of the display panel is improved.
For example, the second auxiliary electrode 42 may be reused as the supporting pillar 5, that is, in the embodiment of the present invention, the second auxiliary electrode 42 is used not only for conducting carriers that laterally migrate, but also for supporting a mask (not shown) that is needed when evaporating the light emitting layers 30, so as to avoid an excessively large space between two adjacent light emitting layers 30 for placing the supporting pillar 5 and the second auxiliary electrode 42, respectively, so that the aperture ratio of the display panel is not reduced. Illustratively, the shape of the second auxiliary electrode 42 includes any one of a sphere, an ellipsoid, a cone, and a cylinder. For example, the cone may include a cone, a triangular cone, and the like, which is not limited in the embodiments of the present invention.
The structure of the display panel according to the embodiment of the present invention is described above by taking the second electrode 32 as an example, that is, the second electrode 32 only covers the corresponding light emitting layer 30, and actually, in the embodiment of the present invention, the second electrode 32 may be disposed in a planar structure covering each light emitting device 3, for example, as shown in fig. 6, fig. 6 is a cross-sectional schematic view taken along AA' of fig. 2, in which the second electrode 32 is a planar structure covering each light emitting device 3, in this case, the embodiment of the present invention electrically connects the auxiliary electrode 4 and the second electrode 32, and the resistance of the second electrode 32 can be reduced. If the resistance of the second electrode 32 is large, when the second electrode 32 is powered on, a large voltage drop will be generated on the second electrode 32, so that under the condition that the voltage provided to the second electrode 32 is constant, the voltages received at different positions of the second electrode 32 will be different. For example, when a voltage is applied to the second electrode 32 by a driving chip (not shown) located in a frame region of the display panel, the voltage drop across the second electrode 32 is large, which results in a high voltage received by the second electrode 32 at a position close to the frame region, and a low voltage received by the second electrode 32 at a position in the middle of the display panel, i.e., a position far away from the frame region, which results in a phenomenon that the middle area of the display panel is dark and the peripheral area is bright, i.e., display unevenness occurs during display. In the embodiment of the invention, the auxiliary electrode 4 is electrically connected with the second electrode 32, so that the problem of mutual crosstalk between different light-emitting devices 3 can be solved by using the auxiliary electrode 4, and the resistance of the second electrode 32 can be reduced, thereby reducing the voltage drop of the second electrode 32 during operation and improving the display uniformity of the display panel.
On the basis that the second electrode 32 is disposed to cover the planar structure of each light emitting device 3, as in the case where the second electrode 32 is patterned to cover only the corresponding light emitting layer 30, the auxiliary electrode 4 may also be disposed to include a first auxiliary electrode 41 and a second auxiliary electrode 42, for example, as shown in fig. 7, fig. 7 is a further schematic cross-sectional view along AA' in fig. 2, where the auxiliary electrode 4 includes a first auxiliary electrode 41 and a second auxiliary electrode 42 that are electrically connected, and at this time, the specific structure of the auxiliary electrode 4 is similar to that shown in fig. 5, and the same parts are not repeated herein. The difference is that, at this time, the second auxiliary electrode 42 is in contact with the second electrode 32, so that the resistance of the second electrode 32 can be reduced, the voltage drop of the second electrode 32 during the operation of the display panel can be reduced, and the effect of improving the display uniformity of the display panel can be achieved.
For example, as shown in fig. 8, fig. 8 is a schematic top view of another display panel according to an embodiment of the present invention, wherein the display panel according to the embodiment of the present invention further includes a touch electrode layer 6 formed on the second substrate, and the touch electrode layer 6 is disposed to enable the display panel to implement touch operation, so as to enrich the use functions of the display panel.
Specifically, as shown in fig. 8, the touch electrode layer 6 may include a touch driving electrode 601 and a touch sensing electrode 602, and when determining the touch position, the touch driving electrode 601 is provided with a touch driving signal, and a change of an output signal of the touch sensing electrode 602 is detected, so as to determine the occurrence position of touch.
For example, in order to improve the light transmittance of the touch electrode layer 6, the touch driving electrodes 601 and/or the touch sensing electrodes 602 in the touch electrode layer 6 are usually designed into a grid or a strip, as shown in fig. 9, fig. 9 is an enlarged schematic view of the positions corresponding to the size of 4 × 4 sub-pixels in fig. 8, wherein the touch electrode layer 6 includes sub-touch electrodes 61 arranged at intervals; a gap exists between two adjacent sub-touch electrodes 61 to improve the light transmittance of the touch electrode layer 6.
When the auxiliary electrode 4 is disposed to contact with the side of the common layer 33 facing the second substrate 2, in actual manufacturing, the auxiliary electrode 4 may be formed on the second substrate 2, and the auxiliary electrode 4 and the touch electrode layer 6 are located at different layers, specifically, as shown in fig. 10, fig. 10 is a schematic cross-sectional view along BB' of fig. 9, where the insulating layer 7 is further included between the auxiliary electrode 4 and the touch electrode layer 6. In the actual production of the touch display panel, the touch electrode layer 6 and the light emitting device 3 are usually fabricated separately on different substrates, and then the two substrates are bonded to complete the fabrication of the touch display panel. Therefore, in the embodiment of the invention, the auxiliary electrode 4 and the touch electrode layer 6 are both formed on the second substrate 2, and in the actual process, only the process of adding the auxiliary electrode 4 is needed after the touch electrode layer 6 is prepared, so that the process is simple and easy to implement.
In the above description, the touch electrode layer 6 and the auxiliary electrode 4 are located at different layers to describe the display panel including the touch electrode layer 6, actually, when the display panel including the touch electrode layer 6 is manufactured, the touch electrode layer 6 and the auxiliary electrode 4 may be disposed at the same film layer, as shown in fig. 11 and 12, fig. 11 is another enlarged schematic view of fig. 8 corresponding to the size of 4 × 4 sub-pixels, fig. 12 is a schematic cross-sectional view of fig. 11 along CC', wherein the auxiliary electrode 4 includes sub-auxiliary electrodes 40 disposed at intervals; the touch electrode layer 6 comprises sub touch electrodes 61 arranged at intervals; the sub auxiliary electrodes 40 and the sub touch electrodes 61 are alternately arranged in the same layer; the two adjacent sub-touch electrodes 61 are connected through a bridge 62; the bridge 62 and the sub-touch electrode 61 are located on different layers, specifically, the insulating layer 7 is further included between the bridge 62 and the sub-touch electrode 61, the insulating layer 7 includes a via hole 70, and the bridge 62 and the sub-touch electrode 61 are connected through the via hole 70.
It should be noted that fig. 10 and 12 are only schematic diagrams illustrating that the touch electrode layer 6 is disposed On a side of the second substrate 2 facing the first substrate 1, that is, the touch display panel is disposed In an In-cell structure, and actually, as shown In fig. 13, fig. 13 is another schematic cross-sectional diagram along BB' of fig. 9, the touch display panel may also be disposed In an On-cell or Out-cell structure In the embodiment of the present invention, that is, the touch electrode layer 6 is disposed On a side of the second substrate 2 away from the first substrate 1.
Note that, in the case of manufacturing the display panel including the touch electrode layer 6, the structures shown in fig. 10, 12, and 13 are merely schematic, and actually, the second electrode 32 may be provided in a patterned structure in which only the second electrode 32 covers the corresponding light-emitting layer 30 and the second electrode 32 is not connected to the auxiliary electrode 4. Also, it is also possible to provide the auxiliary electrode 4 to include a first auxiliary electrode and a second auxiliary electrode connected to each other, and to make the second auxiliary electrode multiplex as a support column. That is, whether the second electrode 32 is patterned, whether the auxiliary electrode 4 is disposed to include the first auxiliary electrode 41 and the second auxiliary electrode 42, and whether the display panel includes the touch electrode layer, whether the touch electrode layer is disposed on the same layer as the auxiliary electrode 4, may be freely combined, and different combinations thereof are not specifically listed in the embodiment of the present invention.
In the above, the embodiment of the present invention is described by taking the auxiliary electrode 4 in contact with the side of the common layer 33 close to the second substrate 2 as an example, actually, the auxiliary electrode 4 may also be disposed in contact with the side of the common layer 33 close to the first substrate 1, as shown in fig. 14, fig. 14 is another schematic cross-sectional view along BB' of fig. 9, wherein the auxiliary electrode 4 is in contact with the side of the common layer 33 close to the first substrate 1, specifically, the auxiliary electrode 4 may be disposed in the same layer as the first electrode 31, so that the auxiliary electrode 4 and the first electrode 31 can be fabricated in the same process when fabricating the display panel. It is only necessary to evaporate the light emitting layer 30 at the position corresponding to the first electrode 31 and not evaporate the light emitting layer 30 at the position corresponding to the auxiliary electrode 4 in the subsequent process.
It should be understood that, when the auxiliary electrode 4 is located on the side of the common layer 33 close to the first substrate 1, the touch electrode layer 6 may also be disposed in the display panel in such a manner that the auxiliary electrode 4 is disposed on the side of the common layer 33 away from the first substrate 1, which is not described herein again.
For example, the material of the auxiliary electrode 4 and the touch electrode layer 6 may be metal or transparent metal oxide, and optionally, the metal material may be any one of copper, silver, titanium, and the like. The transparent metal oxide material can be any one of indium tin oxide, indium zinc oxide, indium gallium zinc oxide and the like. In an actual manufacturing process of the display panel, the materials of the auxiliary electrode 4 and the touch electrode layer 6 may be the same or different, which is not limited in the embodiment of the present invention. For example, in the embodiment of the present invention, in order to enhance the light transmittance of the touch electrode layer 6 and reduce the resistance of the touch electrode layer 6, a nano silver wire material or other light-permeable nano materials may be selected to manufacture the touch electrode layer 6, so as to avoid affecting the normal light emission of each light emitting device 3 and ensure the touch sensitivity.
Fig. 15 is a schematic view of a display device according to an embodiment of the present invention, where the display device includes the display panel 100. The specific structure of the display panel 100 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 15 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
In the display device provided by the embodiment of the invention, the auxiliary electrode which is in contact with the common layer positioned between the two adjacent light emitting layers is arranged in the display panel, and the auxiliary electrode is electrically connected with the negative potential, so that in the working process of the display panel, when transverse leakage current occurs, namely, carriers of a certain light emitting device transversely migrate from the light emitting device to other light emitting devices through the common layer, the transversely migrated carriers can be guided away through the auxiliary electrode connected with the negative potential, thereby avoiding the migration of the carriers among different light emitting devices, namely, avoiding the mutual crosstalk phenomenon of the light emitting devices during working, and improving the display effect of the display device.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (13)
1. A display panel, comprising:
the first substrate and the second substrate are oppositely arranged;
a plurality of light emitting devices on a side of the first substrate facing the second substrate; the light-emitting device comprises a first electrode, a light-emitting layer, a common layer and a second electrode which are arranged in a stacked manner; the common layer is positioned on one side of the light-emitting layer facing the first electrode and/or the second electrode;
an auxiliary electrode connected to a negative potential, the auxiliary electrode being in contact with the common layer between two adjacent light-emitting layers;
the display panel further comprises a support column; the supporting columns are positioned between the first substrate and the second substrate; the auxiliary electrode and the supporting column are overlapped in the orthographic projection of the plane of the display panel;
the auxiliary electrode is in contact with one side of the common layer close to the second substrate.
2. The display panel according to claim 1, wherein an orthographic projection of the auxiliary electrode on a plane of the display panel does not overlap with an orthographic projection of the light-emitting layer on a plane of the display panel.
3. The display panel according to claim 2, wherein the shape of the auxiliary electrode comprises a grid and/or a stripe.
4. The display panel according to claim 2, wherein the auxiliary electrode is electrically connected to the second electrode.
5. The display panel according to claim 2, wherein the auxiliary electrode and the second electrode are not connected to each other.
6. The display panel according to claim 4 or 5, wherein the auxiliary electrode comprises a first auxiliary electrode and a second auxiliary electrode, and the first auxiliary electrode and the second auxiliary electrode are electrically connected; the second auxiliary electrode is in contact with the common layer; the orthographic projection of the second auxiliary electrode on the plane of the display panel is not overlapped with the orthographic projection of the light-emitting layer on the plane of the display panel.
7. The display panel according to claim 6, wherein the second auxiliary electrodes are multiplexed as the support columns.
8. The display panel according to claim 6, wherein the shape of the second auxiliary electrode comprises any one of a sphere, a cone, and a cylinder.
9. The display panel according to claim 2, further comprising a touch electrode layer formed on the second substrate.
10. The display panel according to claim 9, wherein the auxiliary electrode is formed on the second substrate, and the auxiliary electrode and the touch electrode layer are located on different layers.
11. The display panel according to claim 9, wherein the auxiliary electrodes comprise sub-auxiliary electrodes arranged at intervals; the touch electrode layer comprises sub touch electrodes arranged at intervals; the sub auxiliary electrodes and the sub touch electrodes are alternately arranged in the same layer; the two adjacent sub-touch electrodes are connected through a bridge;
the bridge and the sub-touch electrodes are located on different layers, and the bridge is connected with the sub-touch electrodes through via holes.
12. The display panel according to claim 1, wherein a material of the auxiliary electrode comprises a metal or a transparent metal oxide.
13. A display device characterized in that it comprises a display panel according to any one of claims 1 to 12.
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| CN110286803B (en) * | 2019-06-28 | 2023-05-09 | 武汉天马微电子有限公司 | Display panel and display device |
| CN110610972B (en) * | 2019-09-19 | 2022-06-03 | 京东方科技集团股份有限公司 | Display substrate, preparation method thereof and display device |
| CN111710704B (en) * | 2020-06-29 | 2022-11-15 | 云谷（固安）科技有限公司 | Display panel and display device |
| CN111863918B (en) * | 2020-07-29 | 2023-05-02 | 京东方科技集团股份有限公司 | Display backboard, manufacturing method thereof, display panel and display device |
| CN111863929B (en) * | 2020-08-28 | 2024-02-20 | 京东方科技集团股份有限公司 | Display substrate, preparation method thereof and display device |
| CN114023910A (en) * | 2021-11-05 | 2022-02-08 | 武汉天马微电子有限公司 | Display panel and display device |
| KR20230101185A (en) * | 2021-12-29 | 2023-07-06 | 엘지디스플레이 주식회사 | Organic light emitting display device |
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