CN117479573A - Display panel and display device - Google Patents

Abstract

The invention discloses a display panel and a display device. The driving circuit layer is arranged on the substrate; the first metal layer is arranged on one side of the driving circuit layer far away from the substrate and comprises an auxiliary cathode; the second metal layer is arranged on one side of the driving circuit layer away from the substrate and comprises a conductive connecting part, and the conductive connecting part is positioned on one side of the auxiliary cathode away from the driving circuit layer; the pixel definition layer is arranged on one side of the second metal layer far away from the driving circuit layer, and a first opening corresponding to the conductive connection part and the auxiliary cathode is arranged in the pixel definition layer; the light-emitting device is arranged on one side of the pixel definition layer far away from the second metal layer and comprises a laminated organic light-emitting layer and a cathode layer; the light emitting device covers the surface of the conductive connecting part far away from the auxiliary cathode and the surface of the auxiliary cathode far away from the driving circuit layer at the first opening. The invention can reduce the contact resistance between the cathode layer and the auxiliary cathode, improve the voltage drop phenomenon and improve the display uniformity of the display panel.

Description

Display panel and display device

Technical Field

The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.

Background

An Organic Light-Emitting Diode (OLED) display is a novel display technology, has the advantages of self-luminescence, high efficiency, high contrast, soft luminescence, wide color gamut, light weight, flexibility and the like, caters to the trend of the current global display market for high-performance, high efficiency, light weight and flexible displays, can meet the worldwide requirement for low carbon and environmental protection, and is known as the next generation display technology after a liquid crystal display.

In the OLED display panel, the cathode layer is covered on the whole surface, so that when signal transmission is performed in the cathode layer, the actual voltage values at different positions will be different, resulting in uneven display.

At present, an auxiliary cathode is usually arranged in the display panel, and a contact hole is formed, so that the cathode layer can be overlapped with the auxiliary cathode, and the cathode layer and the auxiliary cathode are connected in parallel, so that the voltage drop phenomenon is improved. However, since the organic light emitting layer is also deposited in the contact hole, the auxiliary cathode has an influence on the improvement phenomenon of the voltage drop.

Disclosure of Invention

The embodiment of the invention provides a display panel and a display device, which can effectively reduce the impedance between a cathode layer and an auxiliary cathode, improve the voltage drop phenomenon,

an embodiment of the present invention provides a display panel including:

a substrate;

a driving circuit layer disposed on the substrate;

the first metal layer is arranged on one side of the driving circuit layer, which is far away from the substrate, and comprises an auxiliary cathode;

the second metal layer is arranged on one side of the driving circuit layer, which is far away from the substrate, and comprises a conductive connecting part, wherein the conductive connecting part is positioned on one side of the auxiliary cathode, which is far away from the driving circuit layer;

the pixel definition layer is arranged on one side, far away from the driving circuit layer, of the second metal layer, and a first opening corresponding to the conductive connection part and the auxiliary cathode is arranged in the pixel definition layer;

a light emitting device disposed on a side of the pixel defining layer away from the second metal layer and including a stacked organic light emitting layer and cathode layer;

wherein, at the first opening, the light emitting device covers the surface of the conductive connection part far away from the auxiliary cathode and the surface of the auxiliary cathode far away from the driving circuit layer.

In one embodiment of the present invention, the conductive connection part includes a first connection sub-part located in the first opening, the auxiliary cathode includes a first electrode sub-part located between the first connection sub-part and the driving circuit layer, and a second electrode sub-part connected to the first electrode sub-part and located in the first opening, and the light emitting device covers a surface of the first connection sub-part on a side away from the first electrode sub-part, and a surface of the second electrode sub-part on a side away from the driving circuit layer.

In one embodiment of the present invention, the conductive connection portion further includes a second connection sub-portion connected to the first connection sub-portion, and an orthographic projection of the second connection sub-portion on the substrate is located within an orthographic projection of the pixel defining layer on the substrate.

In one embodiment of the present invention, the second metal layer includes a plurality of the conductive connection portions, and one of the first openings is disposed corresponding to the plurality of the conductive connection portions;

wherein, at the first opening, the light emitting device covers the surface of the first connection sub-portion of each conductive connection portion, which is far away from the auxiliary cathode, and the surface of the auxiliary cathode, which is far away from the driving circuit layer.

In an embodiment of the present invention, the plurality of conductive connection portions corresponding to the same first opening are disposed at intervals, and at the same first opening, orthographic projections of the first connection sub-portions of the plurality of conductive connection portions on the substrate are located in orthographic projections of the auxiliary cathode on the substrate.

In one embodiment of the present invention, the conductive connection portion includes a first sub-layer, a second sub-layer, and a third sub-layer stacked, the third sub-layer being located between the auxiliary cathode and the second sub-layer, the first sub-layer being located on a side of the second sub-layer away from the third sub-layer;

wherein, the first sublayer includes a first step portion extending into the first opening along a first direction, the second sublayer includes a second step portion located in the first opening and protruding from the first step portion along the first direction, the third sublayer includes a third step portion located in the first opening and protruding from the second step portion along the first direction, and the first direction is parallel to the substrate.

In one embodiment of the present invention, in the first opening, the light emitting device covers at least a surface of the first step portion on a side away from the auxiliary cathode, a surface of the second step portion on a side away from the auxiliary cathode, a surface of the third step portion on a side away from the auxiliary cathode, and a surface of the auxiliary cathode on a side away from the driving circuit layer.

In one embodiment of the present invention, the conductive connection portion includes a bottom surface adjacent to one side of the auxiliary cathode, and a sidewall connected to the bottom surface and located in the first opening, and an angle between the sidewall and the bottom surface is less than 90 °.

In one embodiment of the present invention, the second metal layer further includes an anode spaced from the conductive connection portion, and the pixel defining layer is further provided with a second opening corresponding to the anode;

the organic light-emitting layer is arranged between the pixel definition layer and the cathode layer, the organic light-emitting layer covers the surface of the conductive connecting part, which is far away from the auxiliary cathode, and the surface of the auxiliary cathode, which is far away from the driving circuit layer, in the first opening, the organic light-emitting layer covers the surface of the anode, which is far away from the driving circuit layer, in the second opening, and the cathode layer covers the surface of the organic light-emitting layer, which is far away from the pixel definition layer.

According to the above object of the present invention, there is also provided a display device including the display panel and a device main body, and the display panel is integrally combined with the device main body.

The invention has the beneficial effects that: the auxiliary cathode is arranged at the first opening and can be electrically connected with the cathode layer, so that the phenomenon of voltage drop of the cathode layer is improved; in addition, the invention also provides the conductive connecting part at the first opening, and further adds another conductive path formed by the cathode layer, the conductive connecting part and the auxiliary cathode on the basis of the conductive path with the cathode layer and the auxiliary cathode so as to form at least two paths of parallel connection, thereby further reducing the contact impedance between the cathode layer and the auxiliary cathode, effectively improving the voltage drop phenomenon and improving the display uniformity of the display panel.

Drawings

The technical solution and other advantageous effects of the present invention will be made apparent by the following detailed description of the specific embodiments of the present invention with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a conductive connection portion according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

fig. 5 is a graph showing comparison of contact resistance data between a cathode layer and an auxiliary cathode according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Referring to fig. 1, the display panel of the present embodiment includes a substrate 10, a driving circuit layer 20, a first metal layer 30, a second metal layer 40, a pixel defining layer 50 and a light emitting device 60.

Wherein the driving circuit layer 20 is disposed on the substrate 10; the first metal layer 30 is disposed on a side of the driving circuit layer 20 away from the substrate 10, and includes an auxiliary cathode 31; the second metal layer 40 is disposed on a side of the driving circuit layer 20 away from the substrate 10, and includes a conductive connection portion 41, where the conductive connection portion 41 is located on a side of the auxiliary cathode 31 away from the driving circuit layer 20; the pixel defining layer 50 is disposed on a side of the second metal layer 40 away from the driving circuit layer 20, and a first opening 501 corresponding to the conductive connection portion 41 and the auxiliary cathode 31 is disposed in the pixel defining layer 50; the light emitting device 60 is disposed at a side of the pixel defining layer 50 remote from the second metal layer 40, and includes a stacked organic light emitting layer 61 and cathode layer 62.

Further, at the first opening 501, the light emitting device 60 covers the surface of the conductive connection portion 41 on the side away from the auxiliary cathode 31 and the surface of the auxiliary cathode 31 on the side away from the driving circuit layer 20.

In the implementation and application process, the auxiliary cathode 31 is arranged at the first opening 501 and can be electrically connected with the cathode layer 62, so that the phenomenon of voltage drop of the cathode layer 62 is improved; in addition, the embodiment of the invention further provides the conductive connection portion 41 at the first opening 501, and further adds another conductive path formed by the cathode layer 62, the conductive connection portion 41 and the auxiliary cathode 31 on the basis of having one conductive path of the cathode layer 62 and the auxiliary cathode 31, so as to form at least two paths of parallel connection, further reduce the contact resistance between the cathode layer 62 and the auxiliary cathode 31, effectively improve the voltage drop phenomenon, and improve the display uniformity of the display panel.

Further, referring to fig. 1, the driving circuit layer 20 is disposed on the substrate 10, and the driving circuit layer 20 includes a plurality of thin film transistors and signal traces disposed on the substrate 10, and the thin film transistors are electrically connected to the driving module through the signal traces to transmit the data voltage signals to the thin film transistors, and the thin film transistors can function as switches to continuously transmit the data voltage signals by controlling the switches of the thin film transistors.

The second metal layer 40 is disposed on a side of the driving circuit layer 20 away from the substrate 10, and the second metal layer 40 further includes an anode 42 disposed on the driving circuit layer 20 and spaced apart from the conductive connection portion 41, where the anode 42 is connected to the thin film transistor, and further when the thin film transistor is turned on, a data voltage signal can be transmitted to the anode 42.

In one embodiment, the anode 42 and the conductive connection 41 are made of the same material and may be formed in the same process.

Correspondingly, the pixel defining layer 50 is disposed on a side of the second metal layer 40 away from the driving circuit layer 20, and a second opening 502 corresponding to the anode 42 is further disposed in the pixel defining layer 50, and at least a portion of the upper surface of the anode 502 is exposed by the second opening 502.

The light emitting device 60 includes a stacked organic light emitting layer 61 and a cathode layer 62, specifically, the organic light emitting layer 61 is located between the cathode layer 62 and the pixel defining layer 50; wherein, the light emitting device 60 covers the pixel defining layer 50, i.e. in the second opening 502, the light emitting device 60 covers the surface of the anode 42 away from the driving circuit layer 20; specifically, the organic light-emitting layer 61 covers the surface of the anode 42 on the side away from the driving circuit layer 20, and the cathode layer 62 covers the surface of the organic light-emitting layer 61 on the side away from the pixel defining layer 50.

The cathode layer 62 covers the pixel defining layer 50 on a side far away from the driving circuit layer 20 and extends to the non-display area, the cathode layer 62 can be connected with a power negative signal terminal in the non-display area to receive a voltage signal, when the thin film transistor is turned on, the thin film transistor transmits a data voltage signal to the anode 42, and the power negative signal terminal transmits a voltage signal to the cathode layer 62 to generate a voltage on both sides of the organic light emitting layer 61, so that electrons and holes are excited to emit light in a recombination manner, thereby realizing the light emitting display function of the display panel.

However, the cathode layer 62 is entirely covered, and a voltage drop is likely to occur due to the influence of the resistance, so that a display non-uniformity phenomenon occurs in the display panel. Therefore, in the embodiment of the present invention, the first metal layer 30 includes the auxiliary cathode 31 disposed on the side of the driving circuit layer 20 away from the substrate 10, and the pixel defining layer 50 is provided with the first opening 501 to expose a portion of the upper surface of the auxiliary cathode 31, so that the light emitting device 60 contacts with the auxiliary cathode 31 in the first opening 501.

Specifically, in the first opening 501, the organic light-emitting layer 61 covers a part of the surface of the auxiliary cathode 31 on the side away from the driving circuit layer 20, and the cathode layer 62 covers a surface of the organic light-emitting layer 61 on the side away from the auxiliary cathode 31; in addition, the auxiliary cathode 31 may be further connected to the power negative signal terminal in a wiring manner along the extension outside the non-display area, so that when a voltage is applied between the cathode layer 62 and the auxiliary cathode 31, a tunneling effect may be generated between the cathode layer 62 and the auxiliary cathode 31 in the organic light emitting layer 61, so that the cathode layer 62 and the auxiliary cathode 31 are electrically connected, and the cathode layer 62 may be further connected in parallel with the auxiliary cathode 31, so as to reduce the resistance of the cathode layer 62, improve the voltage drop phenomenon, and improve the display uniformity of the display panel.

Further, the organic light emitting layer 61 may include a stacked electron injection layer, electron transport layer, light emitting layer, hole transport layer, and hole injection layer, and metal ions such as cesium, potassium, sodium, magnesium, etc. are generally formed in the electron injection layer and the electron transport layer, so that the organic light emitting layer 61 itself has a certain conductivity, and also can be conducted between the cathode layer 62 and the auxiliary cathode 31. However, the organic light-emitting layer 61 has a large resistance, and still increases the contact resistance between the cathode layer 62 and the auxiliary cathode 31, thereby reducing the effect of the auxiliary cathode 31 on improving the voltage drop phenomenon.

In the embodiment of the present invention, the conductive connection portion 41 is disposed in the second metal layer 40 and spaced from the anode 42, and the conductive connection portion 41 is located on the side of the auxiliary cathode 31 away from the driving circuit layer 20, and the first opening 501 is also disposed corresponding to the conductive connection portion 41, that is, the first opening 501 also exposes a portion of the surface of the conductive connection portion 41 on the side of the auxiliary cathode 31.

In the first opening 501, the light emitting device 60 covers the surface of the conductive connection portion 41 on the side away from the auxiliary cathode 31 and the surface of the auxiliary cathode 31 on the side away from the driving circuit layer 20; specifically, the surface of the conductive connection portion 41 on the side away from the auxiliary cathode 31 and the surface of the auxiliary cathode 31 on the side away from the driving circuit layer 20 are covered with the organic light emitting layer 61, and the surface of the cathode layer 62 on the side of the organic light emitting layer 61 away from the driving circuit layer 20 is covered with the organic light emitting layer 62.

Similarly, tunneling may be generated between the cathode layer 62 and the auxiliary cathode 31 in the organic light emitting layer 61 to achieve conduction, and tunneling may also be generated between the cathode layer 62 and the conductive connection portion 41 in the organic light emitting layer 61 to achieve conduction. Furthermore, the embodiment of the invention can further increase another conductive path formed by the cathode layer 62, the conductive connection part 41 and the auxiliary cathode 31 on the basis of the conductive path with the cathode layer 62 and the auxiliary cathode 31 so as to form at least two paths of parallel connection, further reduce the contact resistance between the cathode layer 62 and the auxiliary cathode 31, effectively improve the voltage drop phenomenon and improve the display uniformity of the display panel.

It should be noted that, the conductivity of the conductive connection portion 41 may be greater than that of the auxiliary cathode 31, so as to effectively reduce the contact resistance between the cathode layer 62 and the auxiliary cathode 31; the conductivity of the conductive connection portion 41 may be smaller than that of the auxiliary cathode 31, and is not limited thereto.

Specifically, in one embodiment of the present invention, referring to fig. 1, each of the first openings 501 is disposed corresponding to one of the conductive connection portions 41, and the conductive connection portion 41 includes a first connection sub-portion 411 located in the first opening 501 and a second connection sub-portion 412 connected to the first connection sub-portion 411, wherein an orthographic projection of the first connection sub-portion 411 on the substrate 10 is located in an orthographic projection of the first opening 501 on the substrate 10, and an orthographic projection of the second connection sub-portion 412 on the substrate 10 is located in an orthographic projection of the pixel defining layer 50 on the substrate 10.

The auxiliary cathode 31 includes a first electrode sub-portion 311 positioned between the first connection sub-portion 411 and the driving circuit layer 20, and a second electrode sub-portion 312 connected to the first electrode sub-portion 311 and positioned within the first opening 501; correspondingly, the light emitting device 60 covers the surface of the first connection sub-portion 411 on the side away from the auxiliary cathode 31 and the surface of the second electrode sub-portion 312 on the side away from the driving circuit layer 20; specifically, the organic light emitting layer 61 covers the surface of the first connection sub-portion 411 on the side away from the auxiliary cathode 31 and the side connected to the surface, and the surface of the second electrode sub-portion 312 on the side away from the driving circuit layer 20, and the cathode layer 62 covers the surface of the organic light emitting layer 61 on the side away from the driving circuit layer 20.

It can be understood that, on the basis of forming two parallel paths between the cathode layer 62 and the auxiliary cathode 31, the embodiment of the invention further increases the contact area between the light emitting device 60 and the auxiliary cathode 31 through the arrangement of the conductive connection portion 41, and can reduce the contact resistance to a certain extent and improve the voltage drop phenomenon.

In the embodiment of the present invention, the length of the first connection sub-portion 411 in the first direction X is greater than or equal to 2 micrometers and less than or equal to 6 micrometers, and the first direction X is parallel to the substrate 10.

Further, referring to fig. 1 and 2, the conductive connection portion 41 includes a bottom surface 4101 near the auxiliary cathode 31, and a side wall 4102 connected to the bottom surface 4101 and located in the first opening 501, and an angle a between the side wall 4102 and the bottom surface 4101 is smaller than 90 °. Specifically, it may be that an angle a between the bottom surface 4101 and the side wall 4102 of the first connection sub 411 is smaller than 90 °. It can be understood that, in the embodiment of the present invention, the sidewall 4102 is provided with an inclined surface, and the light emitting device 60 further covers the sidewall 4102 of the conductive connection portion 41, so as to further increase the contact area between the light emitting device 60 and the conductive connection portion 41, further reduce the contact resistance, improve the voltage drop phenomenon, and improve the display uniformity of the display panel.

In one embodiment, included angle a is greater than or equal to 40 ° and less than or equal to 65 °.

It should be noted that, the material of the conductive connection portion 41 may be a metal material and/or a conductive oxide material, and the display panel provided in the embodiment of the invention is not limited to bottom emission or top emission, and when the display panel is bottom emission, the second metal layer 40 may be prepared by using a transparent conductive material, that is, the conductive connection portion 41 and the anode 42 are both prepared by using transparent conductive materials.

Further, the conductive connection portions 41 may be uniformly distributed in the display area of the display panel and located between the adjacent second openings 502, and similarly, the distribution density of the conductive connection portions 41 may also gradually decrease from the center of the display area to a direction away from the center of the display area; or more conductive connection portions 41 are provided at positions where the voltage drop phenomenon is remarkable.

On the other hand, the auxiliary cathode 31 is arranged at the first opening 501 and can be electrically connected with the cathode layer 62, so that the voltage drop phenomenon of the cathode layer 62 is improved; in addition, the embodiment of the invention further provides the conductive connection portion 41 at the first opening 501, and further adds another conductive path formed by the cathode layer 62, the conductive connection portion 41 and the auxiliary cathode 31 on the basis of having one conductive path of the cathode layer 62 and the auxiliary cathode 31, so as to form at least two paths of parallel connection, further reduce the contact resistance between the cathode layer 62 and the auxiliary cathode 31, effectively improve the voltage drop phenomenon, and improve the display uniformity of the display panel.

It is to be understood that one first opening 501 may also correspond to a plurality of conductive connection portions 41, and the plurality of conductive connection portions 41 corresponding to the same first opening 501 are spaced apart, and at the same first opening 501, the orthographic projection of the first connection sub-portions 411 of the plurality of conductive connection portions 41 on the substrate is located in the orthographic projection of the auxiliary cathode 31 on the substrate 10.

Further, at the first opening 501, the light emitting device 60 covers the surface of the first connection sub-portion 411 of each conductive connection portion 41 on the side away from the auxiliary cathode 31 and the surface of the auxiliary cathode 31 on the side away from the driving circuit layer 20.

Specifically, in another embodiment of the present invention, referring to fig. 3, the difference between the present embodiment and the previous embodiment is the number and positions of the conductive connection portions 41; in the present embodiment, one first opening 501 may correspond to two conductive connection portions 41.

The two conductive connection portions 41 are disposed on opposite sides of the first opening 501 along the first direction X, and the first connection sub-portions 411 of the two conductive connection portions 41 are disposed at intervals, that is, the first opening 501 exposes a surface of the two first connection sub-portions 411 on a side far away from the auxiliary cathode 31 and a surface of the second electrode sub-portion 312 of the auxiliary cathode 31 on a side far away from the driving circuit layer 20, so that a conductive path between one cathode layer 62 and the auxiliary cathode 31, a conductive path between the two cathode layers 62, the conductive connection portions 41 and the auxiliary cathode 31 are formed in the first opening 501, and three paths of parallel connection are formed.

Alternatively, in the present embodiment, the length of the first connection sub-portion 411 of each conductive connection portion 41 in the first direction X may be greater than or equal to 2 micrometers and less than or equal to 4 micrometers.

In another embodiment of the present invention, referring to fig. 4, the difference between the present embodiment and the first embodiment is that the film structure of the conductive connection portion 41 is different.

In the present embodiment, the second metal layer 40 is formed by stacking a plurality of conductive film layers, and the conductive connection portion 41 and the anode 42 are also formed by stacking a plurality of conductive film layers.

Specifically, the conductive connection portion 41 includes a laminated first sub-layer 45, second sub-layer 44, and third sub-layer 43, the third sub-layer 43 being located between the auxiliary cathode 31 and the second sub-layer 44, the first sub-layer 45 being located on a side of the second sub-layer 44 remote from the third sub-layer 43.

Alternatively, the material of the first sub-layer 45 and the third sub-layer 43 may be a transparent conductive oxide material, and the material of the second sub-layer 44 may be a conductive metal material.

Wherein the stacked first sub-layer 45, second sub-layer 44 and third sub-layer 43 form a step structure in the first opening 501; specifically, the first sub-layer 45 includes a first step 451 extending into the first opening 501 in the first direction X, the second sub-layer 44 includes a second step 441 located in the first opening 501 and protruding from the first step 451 in the first direction X, and the third sub-layer 43 includes a third step 431 located in the first opening 501 and protruding from the second step 441 in the first direction X.

Within the first opening 501, the light emitting device 60 covers at least a surface of the first step 451 on a side away from the auxiliary cathode 31, a surface of the second step 441 on a side away from the auxiliary cathode 31, a surface of the third step 431 on a side away from the auxiliary cathode 31, and a surface of the auxiliary cathode 31 on a side away from the driving circuit layer 20. In addition, the light emitting device 60 also covers the sidewalls of the first step 451, the second step 441, and the third step 431.

Alternatively, the length of the second step portion 441 in the first direction X is greater than or equal to 2 micrometers and less than or equal to 3 micrometers, and the length of the third step portion 431 in the first direction X is greater than or equal to 2 micrometers and less than or equal to 3 micrometers.

Further, in the present embodiment, the angle between the bottom surface of the first step portion 451 near the auxiliary cathode 31 side and the side wall connected to the bottom surface is 40 ° or more and 65 ° or less, further, the angle between the bottom surface of the second step portion 441 near the auxiliary cathode 31 side and the side wall connected to the bottom surface is 40 ° or more and 65 ° or less, and the angle between the bottom surface of the third step portion 431 near the auxiliary cathode 31 side and the side wall connected to the bottom surface is 40 ° or more and 65 ° or less.

In this embodiment, the conductive paths between the cathode layer 62 and the auxiliary cathode 31, the conductive paths between the cathode layer 62, the first sub-layer 45, the second sub-layer 44, the third sub-layer 43 and the auxiliary cathode 31, the conductive paths between the cathode layer 62, the second sub-layer 44, the third sub-layer 43 and the auxiliary cathode 31, and the conductive paths between the cathode layer 62, the third sub-layer 43 and the auxiliary cathode 31 are formed in the first opening 501 in four parallel, so that the contact resistance is further reduced, the voltage drop phenomenon is improved, and the display uniformity of the display panel is improved, compared with the previous embodiment.

In the present embodiment, the effect of reducing the contact resistance between the cathode layer 62 and the auxiliary cathode 31 was verified by providing the conductive connection portion 41 in the present embodiment by providing the first, second, third and comparative examples; the display panel of the first embodiment is disposed corresponding to the conductive connection portion 41 of the structure shown in fig. 1, the display panel of the second embodiment is disposed corresponding to the conductive connection portion 41 of the structure shown in fig. 3, the display panel of the third embodiment is disposed corresponding to the conductive connection portion 41 of the structure shown in fig. 4, the display panel of the comparative example is not disposed with the conductive connection portion 41, and the light emitting device 60 covers the surface of the auxiliary cathode 31 on the side far from the driving circuit layer 20 in the first opening 501; and verified to obtain a bar graph as shown in fig. 5.

As can be seen from fig. 5, with reference to the comparative example, two parallel passages are formed in the first embodiment, the contact resistance between the cathode layer 62 and the auxiliary cathode 31 can be reduced to about 35% of the comparative example, three parallel passages are formed in the second embodiment, the contact resistance between the cathode layer 62 and the auxiliary cathode 31 can be reduced to about 30% of the comparative example, and four parallel passages are formed in the third embodiment, the contact resistance between the cathode layer 62 and the auxiliary cathode 31 can be reduced to about 3% of the comparative example; on the contrary, the conductive connection portion 41 in the embodiment of the present invention can effectively reduce the contact resistance between the cathode layer 62 and the auxiliary cathode 31, so as to improve the voltage drop phenomenon and display uniformity of the display panel.

In addition, the embodiment of the invention also provides a display device, which comprises the display panel and the device main body, wherein the display panel and the device main body are combined into a whole.

The device body may include a middle frame, a power supply, and the like, and the display device may be a display terminal such as a mobile phone, a tablet, a television, and the like, which is not limited herein.

In summary, the embodiment of the present invention provides the auxiliary cathode 31 at the first opening 501 and can form an electrical connection with the cathode layer 62, so as to improve the voltage drop of the cathode layer 62; in addition, the embodiment of the invention further provides the conductive connection portion 41 at the first opening 501, and further adds another conductive path formed by the cathode layer 62, the conductive connection portion 41 and the auxiliary cathode 31 on the basis of having one conductive path of the cathode layer 62 and the auxiliary cathode 31, so as to form at least two paths of parallel connection, further reduce the contact resistance between the cathode layer 62 and the auxiliary cathode 31, effectively improve the voltage drop phenomenon, and improve the display uniformity of the display panel.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The display panel and the display device provided by the embodiments of the present invention are described in detail, and specific examples are applied to illustrate the principles and the embodiments of the present invention, and the description of the above embodiments is only used to help understand the technical solution and the core idea of the present invention; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (10)

1. A display panel, comprising:

a substrate;

a driving circuit layer disposed on the substrate;

the first metal layer is arranged on one side of the driving circuit layer, which is far away from the substrate, and comprises an auxiliary cathode;

the second metal layer is arranged on one side of the driving circuit layer, which is far away from the substrate, and comprises a conductive connecting part, wherein the conductive connecting part is positioned on one side of the auxiliary cathode, which is far away from the driving circuit layer;

the pixel definition layer is arranged on one side, far away from the driving circuit layer, of the second metal layer, and a first opening corresponding to the conductive connection part and the auxiliary cathode is arranged in the pixel definition layer;

a light emitting device disposed on a side of the pixel defining layer away from the second metal layer and including a stacked organic light emitting layer and cathode layer;

wherein, at the first opening, the light emitting device covers the surface of the conductive connection part far away from the auxiliary cathode and the surface of the auxiliary cathode far away from the driving circuit layer.

2. The display panel according to claim 1, wherein the conductive connection portion includes a first connection sub-portion located within the first opening, the auxiliary cathode includes a first electrode sub-portion located between the first connection sub-portion and the driving circuit layer, and a second electrode sub-portion connected to the first electrode sub-portion and located within the first opening, and the light emitting device covers a surface of the first connection sub-portion on a side away from the first electrode sub-portion and a surface of the second electrode sub-portion on a side away from the driving circuit layer.

3. The display panel of claim 2, wherein the conductive connection further comprises a second connection sub-portion connected to the first connection sub-portion, an orthographic projection of the second connection sub-portion on the substrate being within an orthographic projection of the pixel defining layer on the substrate.

4. The display panel according to claim 2, wherein the second metal layer includes a plurality of the conductive connection portions, and one of the first openings is provided corresponding to the plurality of the conductive connection portions;

wherein, at the first opening, the light emitting device covers the surface of the first connection sub-portion of each conductive connection portion, which is far away from the auxiliary cathode, and the surface of the auxiliary cathode, which is far away from the driving circuit layer.

5. The display panel according to claim 4, wherein a plurality of the conductive connection portions corresponding to the same first opening are disposed at intervals, and orthographic projections of the first connection sub-portions of the plurality of the conductive connection portions on the substrate are located within orthographic projections of the auxiliary cathode on the substrate at the same first opening.

6. The display panel of claim 1, wherein the conductive connection comprises a stacked first sub-layer, a second sub-layer, and a third sub-layer, the third sub-layer being located between the auxiliary cathode and the second sub-layer, the first sub-layer being located on a side of the second sub-layer remote from the third sub-layer;

wherein, the first sublayer includes a first step portion extending into the first opening along a first direction, the second sublayer includes a second step portion located in the first opening and protruding from the first step portion along the first direction, the third sublayer includes a third step portion located in the first opening and protruding from the second step portion along the first direction, and the first direction is parallel to the substrate.

7. The display panel according to claim 6, wherein in the first opening, the light emitting device covers at least a surface of the first step portion on a side away from the auxiliary cathode, a surface of the second step portion on a side away from the auxiliary cathode, a surface of the third step portion on a side away from the auxiliary cathode, and a surface of the auxiliary cathode on a side away from the driving circuit layer.

8. The display panel according to claim 1, wherein the conductive connection portion includes a bottom surface adjacent to the auxiliary cathode side, and a sidewall connected to the bottom surface and located in the first opening, and an angle between the sidewall and the bottom surface is less than 90 °.

9. The display panel according to claim 1, wherein the second metal layer further includes an anode electrode spaced apart from the conductive connection portion, and the pixel defining layer further has a second opening therein corresponding to the anode electrode;

the organic light-emitting layer is arranged between the pixel definition layer and the cathode layer, the organic light-emitting layer covers the surface of the conductive connecting part, which is far away from the auxiliary cathode, and the surface of the auxiliary cathode, which is far away from the driving circuit layer, in the first opening, the organic light-emitting layer covers the surface of the anode, which is far away from the driving circuit layer, in the second opening, and the cathode layer covers the surface of the organic light-emitting layer, which is far away from the pixel definition layer.

10. A display device comprising the display panel according to any one of claims 1 to 9, and a device main body, and the display panel is integrally combined with the device main body.