CN213583795U - Display panel and display device - Google Patents
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- CN213583795U CN213583795U CN202121191369.7U CN202121191369U CN213583795U CN 213583795 U CN213583795 U CN 213583795U CN 202121191369 U CN202121191369 U CN 202121191369U CN 213583795 U CN213583795 U CN 213583795U
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- YZZNJYQZJKSEER-UHFFFAOYSA-N gallium tin Chemical compound [Ga].[Sn] YZZNJYQZJKSEER-UHFFFAOYSA-N 0.000 claims description 3
- 230000005525 hole transport Effects 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 3
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Abstract
The embodiment of the utility model provides a display panel and a display device, the display panel comprises a substrate; the first electrode layer is arranged on the substrate and is correspondingly arranged in the opening area of the display panel; the light-emitting functional layer is arranged on the first electrode layer; the auxiliary metal wiring layer is arranged on the substrate and is correspondingly arranged in the non-opening area of the display panel; the second electrode layer is arranged on the light-emitting functional layer and the auxiliary metal wiring layer; and a nonlinear resistance layer is also arranged between the auxiliary metal wiring layer and the second electrode layer, and the resistance value of the nonlinear resistance layer is reduced along with the increase of voltage. By additionally arranging the nonlinear resistance layer, the characteristic that the resistance of the nonlinear resistance layer is reduced along with the increase of the voltage is utilized, so that in a region with larger voltage drop, the resistance of the nonlinear resistance layer is smaller, the voltage drop caused by the nonlinear resistance layer is smaller, and in a region with smaller voltage drop, the resistance of the nonlinear resistance layer is larger, and the voltage drop caused by the nonlinear resistance layer is larger, so that the balanced distribution of low-voltage signals of the in-plane power supply is realized, and the brightness uniformity is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel and a display device.
Background
Organic Light-Emitting Diode (OLED) Display panels have characteristics of self-luminescence, high brightness, wide viewing angle, high contrast, flexibility, low power consumption, etc., and thus have attracted much attention, and as a new generation of Display mode, they have begun to gradually replace conventional Liquid Crystal Displays (LCDs) and are widely used in mobile phone screens, computer monitors, full-color televisions, etc.
The OLED panel is composed of self-luminous OLED elements, and the OLED is a current-driven element, and the brightness of the panel is determined by the current passing through the OLED elements. In a high-resolution high-refresh-rate display panel, the luminance uniformity of the panel is greatly affected by the charging rate and the resistance Drop (IR Drop), and the luminance distribution generally tends to be bright at four sides and dark in the middle. At present, the problem of IR Drop of a large-size panel is improved in the industry, an auxiliary cathode wire is generally adopted, a surface cathode is lapped with the auxiliary cathode through an auxiliary cathode contact hole, the surface cathode is connected with the auxiliary cathode wire in parallel, and therefore the cathode resistance of an OLED device is reduced, and the IR Drop is improved. However, the method still has the voltage Drop caused by the auxiliary cathode wire, and the IR Drop cannot be completely avoided, so that the IR Drop may still be a significant cause of poor panel brightness uniformity in the display of the super-large-sized panel.
SUMMERY OF THE UTILITY MODEL
The utility model provides a display panel and display device, display panel can effectively avoid the not good problem of demonstration homogeneity because of IR Drop leads to.
In order to solve the above problem, in a first aspect, the present invention provides a display panel, the display panel includes:
a substrate;
the first electrode layer is arranged on the substrate and is correspondingly arranged in the opening area of the display panel;
a light emitting functional layer disposed on the first electrode layer;
the auxiliary metal wiring layer is arranged on the substrate and is correspondingly arranged in a non-opening area of the display panel;
a second electrode layer disposed on the light emitting functional layer and the nonlinear resistance layer;
and a nonlinear resistance layer is further arranged between the auxiliary metal wiring layer and the second electrode layer, and the resistance value of the nonlinear resistance layer is reduced along with the increase of voltage.
An embodiment of the present invention provides a display panel, the display panel further includes an organic layer disposed on the auxiliary metal routing layer, the organic layer includes a first through hole disposed in the opening area and a second through hole disposed in the non-opening area, such that the first electrode layer and the light emitting functional layer are disposed in the first through hole, the non-linear resistance layer is disposed in the second through hole.
In an embodiment of the present invention, the nonlinear resistance layer is a semiconductor layer.
In an embodiment of the present invention, the semiconductor layer is made of one material selected from indium gallium tin oxide, amorphous silicon and low temperature polysilicon.
An embodiment of the utility model provides an in a display panel, the luminous functional layer is including piling up hole injection layer, hole transport layer, organic luminescent layer, electron transport layer and the electron injection layer that sets up in proper order, non-linear resistance layer with hole injection layer or electron transport layer is with layer setting.
An embodiment of the present invention provides a display panel, wherein the auxiliary metal routing layer and the non-linear resistance layer are further provided with an electrical property improving layer therebetween, and the material of the electrical property improving layer includes indium tin oxide.
An embodiment of the present invention provides a display panel, the first electrode layer includes a first ito layer, a silver layer and a second ito layer stacked on each other, and the electrical property improving layer is disposed on the same layer as the first electrode layer.
The embodiment of the utility model provides an in a display panel, the base plate with be provided with source drain electrode layer between the first electrode layer, first electrode layer electric connection source drain electrode layer, just supplementary metal routing layer with source drain electrode layer sets up with the layer.
An embodiment of the present invention provides a display panel, wherein an encapsulation layer is further disposed on the second electrode layer.
In a second aspect, the present invention further provides a display device, including the above display panel.
Has the advantages that: the embodiment of the utility model provides a display panel and display device, display panel includes the base plate; the first electrode layer is arranged on the substrate and is correspondingly arranged in the opening area of the display panel; the light-emitting functional layer is arranged on the first electrode layer; the auxiliary metal wiring layer is arranged on the substrate and is correspondingly arranged in the non-opening area of the display panel; the second electrode layer is arranged on the light-emitting functional layer and the auxiliary metal wiring layer; and a nonlinear resistance layer is also arranged between the auxiliary metal wiring layer and the second electrode layer, and the resistance value of the nonlinear resistance layer is reduced along with the increase of voltage. The non-linear resistance layer is additionally arranged in the auxiliary metal wiring layer and the second electrode layer, and the characteristic that the resistance of the non-linear resistance layer is reduced along with the increase of voltage is utilized, so that the area with larger voltage drop is smaller in the resistance of the non-linear resistance layer, the voltage drop caused by the non-linear resistance layer is smaller, the area with smaller voltage drop is larger in the resistance of the non-linear resistance layer, and the voltage drop caused by the non-linear resistance layer is larger, so that the balanced distribution of power supply low-voltage signals in the display panel is realized, and the uniformity of the display brightness of the panel is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of 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 without creative efforts.
Fig. 1 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a driving circuit of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional structure diagram of another display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
The embodiment of the utility model provides a display panel, the following section structure schematic diagram that combines this display panel that fig. 1 shows explains in detail:
specifically, the display panel includes:
the substrate 101 may be a rigid substrate, such as a glass substrate, or a flexible substrate, such as a polyimide substrate, to realize various display modes according to actual needs;
a first electrode layer 109 disposed on the substrate 101 and corresponding to an opening area of the display panel, where in a normal case, the first electrode layer 109 is an anode layer, and the opening area is an area actually realizing light emission in each sub-pixel, that is, the first electrode layer 109 includes a plurality of first electrodes (only one is exemplarily shown in fig. 1) arranged corresponding to the array of the openings;
a light emitting function layer 112 disposed on the first electrode layer 109 and corresponding to the plurality of first electrodes arranged in the first electrode layer 109 in an array, wherein the light emitting function layer 112 includes a plurality of light emitting function units electrically connected to the plurality of first electrodes one by one;
an auxiliary metal routing layer 107, disposed on the substrate 101, and configured to a non-opening area of the display panel, for inputting a power low voltage signal, where the non-opening area is an area for placing signal transmission routing lines and thin film transistors in each sub-pixel and is disposed at the periphery of the opening area;
and a second electrode layer 113 disposed on the light-emitting functional layer 112 and the auxiliary metal wiring layer 107, wherein the second electrode layer 113 is a cathode layer corresponding to the first electrode layer 109 as an anode layer, and the second electrode layer 113 is distributed over the entire surface, and forms a display device with the light-emitting functional layer 112 and the first electrode layer 109.
A non-linear resistance layer 111 is further disposed between the auxiliary metal wiring layer 107 and the second electrode layer 113, and a resistance value of the non-linear resistance layer 111 is not a constant value, but decreases with an increase in voltage, and increases with a decrease in voltage, so that a power low-voltage signal input by the auxiliary metal wiring layer 107 is transmitted to the non-linear resistance layer 111 through the auxiliary metal wiring layer 107, and finally transmitted to the second electrode layer 113, so as to provide a power low-voltage signal for the display device.
In the display panel provided in this embodiment, due to the existence of the impedance of the auxiliary metal routing layer 107 itself, when a power low-voltage signal is transmitted, a voltage drop is generated, and the larger the transmission distance is, the larger the generated voltage drop is, so that by adding the nonlinear resistance layer 111 in the auxiliary metal routing layer 107 and the second electrode layer 113, by utilizing the characteristic that the nonlinear resistance layer 111 decreases with the increase of voltage, the larger the voltage drop area, that is, the area far away from the input end of the power low-voltage signal, the smaller the resistance of the nonlinear resistance layer 111 is, the smaller the voltage drop caused by the nonlinear resistance layer 111 is; in the region with smaller voltage drop, i.e. the region close to the input end of the power low-voltage signal, the resistance of the nonlinear resistance layer 111 is larger, and the voltage drop caused by the nonlinear resistance layer 111 is larger, so as to realize the uniform distribution of the power low-voltage signal in the display panel surface, thereby improving the uniformity of the panel display brightness.
On the other hand, referring to the schematic diagram of the driving circuit of the display panel shown in fig. 2, the non-linear resistor layer 111 is further described, here, based on the simplest 2TIC (2 thin film transistors and 1 capacitor) driving circuit as a basis, by adding the non-linear resistor layer 111, that is, by adding a Diode between the display device and the input end of the low voltage signal VSS, the display device is in a series relationship, the input low voltage signal VSS is consumed by the auxiliary metal routing layer 107 and the non-linear resistor layer 111, the cathode end of the display device actually obtains the low voltage signal VSS ', and by the above analysis, the larger the voltage drop caused by the auxiliary metal routing layer 107, the smaller the voltage drop caused by the Diode, the balanced distribution of the low voltage signal VSS' actually obtained in the display panel is realized, thereby improving the uniformity of the display brightness of the panel.
It will be understood by those skilled in the art that in the 2TIC driving circuit described above, the power high voltage signal Vdd is responsible for continuously supplying a stable current to the display device; the Scan signal Scan is responsible for controlling the second thin film transistor T2 and determining the switching of the pixel; due to the existence of the storage capacitor Cst, the Data signal Data is stored, and the first thin film transistor T1 is kept turned on while the second thin film transistor T2 is turned off, so that the control current stably lights up the display device in a desired manner.
Of course, the driving circuit of the display panel can be additionally provided with other thin film transistors and capacitors for electrical compensation besides the 2TIC driving circuit, and the specific compensation mode is determined according to the actual process requirement, which is not specially limited by the present invention.
In this embodiment, an array driving layer for driving display is further disposed between the substrate 101 and the first electrode layer 109, and generally sequentially includes, from bottom to top:
the active layer 102, the material of the active layer 102 may be selected from amorphous silicon, low temperature polysilicon or metal oxide semiconductor according to actual process requirements;
a gate insulating layer 103 disposed on the active layer 102;
a gate layer 104 disposed on the gate insulating layer 103 and correspondingly disposed on the active layer 102;
an interlayer insulating layer 105 provided on the gate layer 104 and having a contact hole in a region corresponding to the active layer 102;
a source/drain electrode layer 106 disposed on the interlayer insulating layer 105 and overlapped with the active layer 102 through a contact hole in the interlayer insulating layer 105;
the specific structure of the array driving layer is only exemplarily shown above, and the array driving layer can also be of other structures according to actual process requirements, and the present invention is not limited thereto.
In some embodiments, the display panel further includes an organic layer disposed on the auxiliary metal routing layer, in an actual process, the organic layer includes a planarization layer 108 and a pixel definition layer 110, the planarization layer 108 and the pixel definition layer 110 include a first via H1 disposed in the open area and a second via H2 disposed in the non-open area, such that the first electrode layer 109 and the light emitting functional layer 112 are disposed in the first via H1 and the first electrode layer 109 is electrically connected to the lower source/drain electrode layer 106, and the nonlinear resistance layer 111 is disposed in the second via H2, that is, the nonlinear resistance layer 111 includes a plurality of diodes independently formed in the second via H2 for balancing the in-plane power low voltage signal distribution of the display panel.
In some embodiments, the ratio of the number of the first through holes H1 to the number of the second through holes H2 is 1:1 to 5:1, i.e., the number of diodes formed by the display device and the non-linear resistance layer 111 is 1:1 to 5:1, according to actual process requirements.
In some embodiments, the nonlinear resistor layer 111 is a semiconductor layer having such a characteristic that the resistance value decreases with the increase of voltage, and further, for convenience of factory manufacturing, the material of the semiconductor layer may be selected from materials commonly used in the art and having such a characteristic that the resistance value decreases with the increase of voltage, for example, one selected from indium gallium tin oxide, amorphous silicon, and low temperature polysilicon.
Further, the light emitting functional layer 112 generally includes a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, and an electron injection layer, which are sequentially stacked, and the hole injection layer or the electron transport layer in the light emitting functional layer 112 also generally has a characteristic that the resistance value decreases with an increase in voltage, so that the nonlinear resistance layer 111 and the hole injection layer or the electron transport layer can be disposed on the same layer, i.e., formed by the same film forming process.
Referring to the schematic cross-sectional structure of another display panel provided in fig. 3, in some embodiments, an electrical property improving layer 115 is further disposed between the auxiliary metal wiring layer 107 and the non-linear resistance layer 111, the electrical property improving layer 115 is made of ito, and the electrical property improving layer 115 is disposed between the auxiliary metal wiring layer 107 and the contact interface of the non-linear resistance layer 111 due to matching of the work function and the energy level of ito itself, so that further uniform distribution of low voltage signals of power supplies in the display panel can be achieved, and uniformity of display brightness of the display panel can be improved.
Further, the first electrode layer 109 includes a first ito layer, a silver layer, and a second ito layer, which are stacked, and the electrical property improving layer 115 and the first electrode layer 109 are disposed in the same layer, i.e., formed by the same film forming process.
In some embodiments, a source drain electrode layer 106 is disposed between the substrate 101 and the first electrode layer 109, the first electrode layer 109 is electrically connected to the source drain electrode layer 106, and the auxiliary metal routing layer 107 and the source drain electrode layer 106 are formed by a same film forming process. Of course, the auxiliary metal routing layer 107 may be disposed on the same layer as other metal layers in the display panel, such as the gate layer 104, i.e. formed by the same film forming process, which is not limited by the present invention.
In some embodiments, an encapsulation layer 114 is further disposed on the second electrode layer 113, and the encapsulation layer 114 is used to prevent water and oxygen from penetrating into the light emitting device to cause device failure. In some embodiments, the material of the encapsulation layer 114 is an inorganic material such as silicon oxide, silicon nitride, aluminum oxide, or the like; in other embodiments, the encapsulation layer 114 is a stacked structure formed by alternating inorganic layers and organic layers, and the material of the organic layers may be at least one of acryl, epoxy, and silicone. The encapsulation layer 114 may be formed by a chemical vapor deposition process, or the encapsulation layer 114 may be formed by an electronic printing process, such as an inkjet printing process or a screen printing process.
It should be noted that, in the above-mentioned display panel embodiment, only the above-mentioned structure is described, and it is understood that, in addition to the above-mentioned structure, the display panel according to the embodiment of the present invention may further include any other necessary structure as needed, and the specific structure is not limited herein.
In another embodiment of the present invention, a display device is further provided, where the display device includes the display panel provided in the above embodiment, and the display device can be installed in various electronic products with display function, for example, the electronic products can be smart phones, tablet computers, notebook computers, digital cameras, digital video cameras, intelligent wearable devices, intelligent weighing electronic scales, vehicle-mounted displays, televisions, electronic book readers, etc.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
The display panel and the display device provided by the embodiments of the present invention are described in detail above, and the principle and the implementation of the present invention are explained herein by applying specific examples, and the description of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be some changes in the specific implementation and application scope, and to sum up, the content of the present specification should not be understood as a limitation to the present invention.
Claims (10)
1. A display panel, comprising:
a substrate;
the first electrode layer is arranged on the substrate and is correspondingly arranged in the opening area of the display panel;
a light emitting functional layer disposed on the first electrode layer;
the auxiliary metal wiring layer is arranged on the substrate and is correspondingly arranged in a non-opening area of the display panel;
the second electrode layer is arranged on the light-emitting functional layer and the auxiliary metal wiring layer;
and a nonlinear resistance layer is further arranged between the auxiliary metal wiring layer and the second electrode layer, and the resistance value of the nonlinear resistance layer is reduced along with the increase of voltage.
2. The display panel according to claim 1, wherein the display panel further comprises an organic layer disposed on the auxiliary metal wiring layer, the organic layer comprising a first via hole disposed in the open area and a second via hole disposed in the non-open area, such that the first electrode layer and the light emitting functional layer are disposed in the first via hole, and the non-linear resistance layer is disposed in the second via hole.
3. The display panel according to claim 1, wherein the nonlinear resistive layer is a semiconductor layer.
4. The display panel according to claim 3, wherein a material of the semiconductor layer is selected from one of indium gallium tin oxide, amorphous silicon, and low temperature polysilicon.
5. The display panel according to claim 1, wherein the light-emitting functional layer includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer, and an electron injection layer, which are sequentially stacked, and the nonlinear resistance layer is disposed in the same layer as the hole injection layer or the electron transport layer.
6. The display panel of claim 1, wherein an electrical property improvement layer is further disposed between the auxiliary metal routing layer and the non-linear resistance layer, and a material of the electrical property improvement layer comprises indium tin oxide.
7. The display panel of claim 6, wherein the first electrode layer comprises a first ITO layer, a silver layer, and a second ITO layer stacked on top of each other, and the electrical property improving layer is disposed on the same layer as the first electrode layer.
8. The display panel according to claim 1, wherein a source drain electrode layer is disposed between the substrate and the first electrode layer, the first electrode layer is electrically connected to the source drain electrode layer, and the auxiliary metal routing layer and the source drain electrode layer are disposed on the same layer.
9. The display panel of claim 1, wherein an encapsulation layer is further disposed on the second electrode layer.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121191369.7U CN213583795U (en) | 2021-05-31 | 2021-05-31 | Display panel and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121191369.7U CN213583795U (en) | 2021-05-31 | 2021-05-31 | Display panel and display device |
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| CN213583795U true CN213583795U (en) | 2021-06-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023019618A1 (en) * | 2021-08-19 | 2023-02-23 | 深圳市华星光电半导体显示技术有限公司 | Light-emitting panel |
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- 2021-05-31 CN CN202121191369.7U patent/CN213583795U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023019618A1 (en) * | 2021-08-19 | 2023-02-23 | 深圳市华星光电半导体显示技术有限公司 | Light-emitting panel |
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| GR01 | Patent grant |