CN115915853A

CN115915853A - Display panel and display device

Info

Publication number: CN115915853A
Application number: CN202211449655.8A
Authority: CN
Inventors: 袁粲; 李永谦; 许程; 周丹丹
Original assignee: BOE Technology Group Co Ltd; Hefei BOE Zhuoyin Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Hefei BOE Zhuoyin Technology Co Ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-04-04

Abstract

The application discloses a display panel and a display device, which are used for relieving uneven cathode voltage drop. The embodiment of the application provides a display panel, display panel includes: a display area and a peripheral area surrounding the display area; the display panel includes: the cathode structure comprises a substrate, an auxiliary electrode wiring structure and a cathode, wherein the auxiliary electrode wiring structure is positioned on one side of the substrate, and the cathode is positioned on one side, deviating from the substrate, of the auxiliary electrode wiring structure; the auxiliary electrode wiring structure includes: a plurality of auxiliary electrode lines extending from the display area to the peripheral area along the first direction, and at least one connecting lead extending along the second direction and located in the peripheral area; the first direction intersects the second direction; the auxiliary electrode wires are electrically connected with the cathode; the connecting leads are electrically connected to the plurality of auxiliary electrode lines.

Description

Display panel and display device

Technical Field

The application relates to the technical field of display, in particular to a display panel and a display device.

Background

Currently, large-sized Organic Light Emitting Diode (OLED) display products are favored in the market. In developing a large-sized OLED display panel, a top emission type OLED device is generally used. The resistance of such a cathode is usually large, and when the resistance of the cathode is large, a large voltage drop is generated at the cathode, which causes a difference in display brightness, and thus, the uniformity of a picture is reduced.

Disclosure of Invention

The embodiment of the application provides a display panel and a display device, which are used for relieving uneven cathode voltage drop.

The embodiment of the application provides a display panel, display panel includes: a display area and a peripheral area surrounding the display area;

the display panel includes: the cathode structure comprises a substrate, an auxiliary electrode wiring structure and a cathode, wherein the auxiliary electrode wiring structure is positioned on one side of the substrate, and the cathode is positioned on one side, away from the substrate, of the auxiliary electrode wiring structure;

the auxiliary electrode wiring structure includes: a plurality of auxiliary electrode lines extending from the display area to the peripheral area along the first direction, and at least one connecting lead extending along the second direction and located in the peripheral area; the first direction intersects the second direction;

a plurality of auxiliary electrode wires are electrically connected with the cathode;

the connecting leads are electrically connected with the plurality of auxiliary electrode wires.

In some embodiments, the peripheral region comprises: the first peripheral area and the second peripheral area are respectively positioned at two sides of the display area in the first direction;

the first peripheral region includes: a first sub-region, a second sub-region located between the first sub-region and the display region in the first direction;

the first sub-region comprises a plurality of first signal input terminals;

the auxiliary electrode wiring structure further includes: a first transition portion located at the first peripheral region;

the first switching part is electrically connected with the first signal input end in the first sub-area, the first switching part is electrically connected with the cathode in the second sub-area, and the first switching part is electrically connected with the auxiliary electrode wires in the second sub-area;

the orthographic projection of the cathode on the substrate base plate and the first sub-area are not overlapped.

In some embodiments, in the display area, the display panel further includes: a plurality of anodes located between the substrate base plate and the cathode and a plurality of driving units located between the substrate base plate and the anodes; the drive unit includes: a thin film transistor electrically connected to the anode;

the first transition portion includes: the first sub-switching part and the second sub-switching part are electrically connected with the first sub-switching part in the first sub-area;

the first sub-switching part and the anode are arranged on the same layer;

the second sub-switching part is positioned between the first sub-switching part and the substrate base plate, and the second sub-switching part and the first signal input end are arranged on the same layer and are integrally connected;

the cathode is connected with the first sub-switching part in the second sub-area.

In some embodiments, the first signal input terminal is disposed on the same layer as the gate of the thin film transistor;

the first transition portion further includes: the third sub-switching part is arranged at the same layer as the source electrode and the drain electrode of the thin film transistor;

the display panel further includes: a first insulating layer between the gate electrode and the source and drain electrodes, a second insulating layer between the source and drain electrodes and the anode electrode, and a pixel defining layer between the anode electrode and the cathode electrode;

in the first sub-area, the third sub-switching part is connected with the second sub-switching part through a first through hole penetrating through the first insulating layer, and the first sub-switching part is connected with the third sub-switching part through a second through hole penetrating through the second insulating layer;

in the second sub-area, the cathode is connected with the first sub-transfer part through a third via hole penetrating through the pixel definition layer.

In some embodiments, in the first subregion, the first insulating layer comprises a plurality of first vias and the second insulating layer comprises a plurality of second vias;

the orthographic projection of the first through hole on the substrate base plate and the orthographic projection of the second through hole on the substrate base plate are not overlapped;

the third via hole has a bar shape extending in the second direction.

In some embodiments, the auxiliary electrode line includes: the display panel comprises a first auxiliary electrode sub-line extending from the display area to the first peripheral area, and a second auxiliary electrode sub-line located in the first peripheral area and electrically connected with the first auxiliary electrode sub-line;

the first auxiliary electrode sub-line is arranged on the same layer with the source electrode and the drain electrode of the thin film transistor or on the same layer with the grid electrode of the thin film transistor;

the second sub auxiliary electrode wires and the first sub switching part are arranged on the same layer, and the second sub auxiliary electrode wires are connected with the first sub switching part on one side, close to the display area, of the first sub switching part.

In some embodiments, the at least one connecting lead comprises: a first connecting lead located at the first peripheral region and/or a second connecting lead located at the second peripheral region.

In some embodiments, in the first direction, the first connection lead is located between the first transfer part and the display area;

the first connecting lead is located between the first sub auxiliary electrode line and the substrate base plate in a direction perpendicular to the substrate base plate.

In some embodiments, in the display region, the display panel further includes a light-shielding layer between the substrate base plate and the driving unit; the first connecting lead and the shading layer are arranged on the same layer.

In some embodiments, the display panel further comprises: a plurality of electrostatic protection units located in the first peripheral region; the electrostatic protection unit comprises a plurality of first level signal input ends, and the first connecting lead is electrically connected with the first level signal input ends.

In some embodiments, the second connecting lead comprises: a first sub-lead portion and a second sub-lead portion electrically connected to the first sub-connection lead;

the first sub-lead part and the first sub-auxiliary electrode wire are arranged on the same layer and connected;

the second sub-lead part and the anode are arranged in the same layer; the cathode is in contact with the second sub-lead portion.

In some embodiments, the anode comprises: the first transparent electrode sublayer, the reflecting electrode sublayer and the second transparent electrode sublayer are stacked;

the second sub-lead portion includes: the first transparent electrode sublayer is arranged on the same layer as the first transparent electrode sublayer and/or the second transparent electrode sublayer is arranged on the same layer as the second transparent electrode sublayer.

the second sub-lead portion includes: the first sub-layer is arranged on the same layer as the first transparent electrode sub-layer, the second sub-layer is arranged on the same layer as the second transparent electrode sub-layer, and the third sub-layer is arranged on the same layer as the reflecting electrode sub-layer;

the third sublayer has a plurality of open areas.

In some embodiments, in the display region, the display panel further includes a plurality of auxiliary cathodes disposed in the same layer as the anode and insulated from each other, the cathodes are electrically connected to the auxiliary cathodes, and the auxiliary cathodes are electrically connected to the first sub-auxiliary electrode lines.

The display device provided by the embodiment of the application comprises the display panel provided by the embodiment of the application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, 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 structural diagram of a display panel according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another display panel provided in the embodiment of the present application;

fig. 3 is a schematic view of an anode structure according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram illustrating a region B in FIG. 1 according to an embodiment of the present disclosure;

FIG. 5 is a cross-sectional view taken along FF' of FIG. 4 according to an embodiment of the present application;

FIG. 6 is a cross-sectional view along EE' of FIG. 1 according to an embodiment of the present application;

FIG. 7 is a schematic view of a region C shown in FIG. 1 according to an embodiment of the present disclosure;

FIG. 8 is a cross-sectional view taken along GG' of FIG. 7 according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of another display panel according to an embodiment of the present disclosure;

FIG. 10 is a schematic view of a region D in FIG. 1 according to an embodiment of the present disclosure;

FIG. 11 is a cross-sectional view taken along HH' of FIG. 10 according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without inventive effort, are within the scope of protection of the application.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present disclosure. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

An embodiment of the present application provides a display panel, as shown in fig. 1, the display panel includes: a display area AA and a peripheral area NA surrounding the display area AA;

the display panel includes: the device comprises a substrate base plate 1, an auxiliary electrode wiring structure 2 positioned on one side of the substrate base plate 1, and a cathode 3 positioned on one side, away from the substrate base plate 1, of the auxiliary electrode wiring structure 2;

the auxiliary electrode wiring structure 2 includes: a plurality of auxiliary electrode lines 201 extending from the display area AA to the peripheral area NA along the first direction Y, and at least one connecting lead 202 extending along the second direction X and located in the peripheral area NA; the first direction Y intersects the second direction X;

a plurality of auxiliary electrode lines 201 are electrically connected with the cathode 3;

the connection lead 202 is electrically connected to a plurality of auxiliary electrode lines 201.

According to the display panel provided by the embodiment of the application, the auxiliary electrode wiring structure comprises a plurality of auxiliary electrode wires, the auxiliary electrode wires extend to the peripheral area from the display area and are electrically connected with the cathode, and the cathode resistance can be reduced compared with that of a cathode which is arranged independently, so that the cathode voltage drop can be reduced. And the auxiliary electrode wiring structure also comprises a connecting lead electrically connected with the plurality of auxiliary electrode wires in the peripheral area, so that the voltage drop can be further shared uniformly, the display brightness difference is relieved, and the uniformity of a display picture is improved.

In one embodiment, as shown in fig. 1, the cathode 3 is disposed over the entire surface, covering the display area AA and covering a part of the peripheral area NA.

In some embodiments, in the display area, as shown in fig. 2, the display panel further includes: a plurality of anodes 5 located between the base substrate 1 and the cathode 3, a plurality of driving units 6 located between the base substrate 1 and the anodes 5, and a light-emitting functional layer 13 located between the anodes 5 and the cathode 3. The drive unit 6 includes: and a thin film transistor TFT electrically connected to the anode 5. The thin film transistor TFT includes: an active layer 14, a gate electrode G, a source electrode S and a drain electrode D. In fig. 2, the thin film transistor TFT is exemplified as a top gate structure, i.e. the gate electrode G is located between the active layer 14 and the source electrode S and the drain electrode D, although the thin film transistor TFT may also be a bottom gate or other structures. The portion where the anode 5, the light emitting functional layer 13, and the cathode 3 are stacked corresponds to the region of the light emitting device. In specific implementation, the light-emitting functional layer includes an organic light-emitting layer, and may further include an electron injection layer, an electron transport layer, a hole injection layer, and the like.

In some embodiments, the anode is a reflective anode and the cathode is a transparent cathode. That is, the display panel provided in the embodiment of the present application, the light emitting device is a top emission light emitting device.

In specific implementation, as shown in fig. 3, the anode includes a first transparent electrode sublayer 501, a reflective electrode sublayer 502, and a second transparent electrode sublayer 503, which are stacked.

In specific implementation, the material of the cathode includes IZO, the material of the first transparent electrode sub-layer and the second transparent electrode sub-layer includes Indium Tin Oxide (ITO), and the material of the reflective electrode sub-layer includes aluminum (Al), for example.

In the display panel of the top emission light emitting device, the cathode is made of a transparent material, and therefore, the cathode resistance is large. The display panel that this application embodiment provided, many auxiliary electrode lines are connected with the negative pole electricity, can reduce the cathode fall to auxiliary electrode wiring structure still includes the connecting lead who is connected with many auxiliary electrode line electricity in the peripheral region, thereby can further share the pressure drop equally, alleviates top emission light emitting device's display panel and shows luminance difference, improves top emission light emitting device's display panel's display screen homogeneity.

In some embodiments, as shown in fig. 2, the display panel further includes: a first insulating layer 6 between the gate electrode G and the source and drain electrodes S and D, a second insulating layer 7 between the source and drain electrodes S and D and the anode electrode 5, a first gate insulating layer 16 between the active layer 14 and the gate electrode G, and a pixel defining layer 8 between the anode electrode 5 and the cathode electrode 3. Wherein the pixel defining layer 8 is used to define the light emitting area of the light emitting device. The anode is electrically connected to the drain D of the thin film transistor TFT through a via hole penetrating the first insulating layer 6, and the source S and the drain D of the thin film transistor TFT are electrically connected to the active layer 14 through via holes penetrating the second insulating layer 7 and the first gate insulating layer 16, respectively. In a specific implementation, the driving unit may further include a capacitor, a first electrode of the capacitor is disposed on the same layer as the gate G, for example, and a second electrode of the capacitor is located between the gate and the source and the drain, and the first insulating layer includes: a second gate insulating layer between the gate electrode and the second electrode, and an interlayer insulating layer between the second electrode and the source and drain electrodes.

In some embodiments, as shown in fig. 1, the peripheral area NA includes: a first peripheral area NA1 and a second peripheral area NA2 respectively located at both sides of the display area AA in the first direction Y;

the first peripheral area NA1 includes: a first sub-area NA11, a second sub-area NA12 located between the first sub-area NA11 and the display area AA in the first direction Y;

the first subregion NA11 comprises a plurality of first signal inputs 4;

the auxiliary electrode wiring structure 2 further includes: a first transition portion 203 located in the first peripheral area NA 1;

the first switching part 203 is electrically connected to the first signal input terminal 4 in the first sub-region NA11, the first switching part 203 is electrically connected to the cathode in the second sub-region NA12, and the first switching part 203 is electrically connected to the plurality of auxiliary electrode lines 201 in the second sub-region NA 12.

It should be noted that the first signal input end is bound to a Chip On Film (COF) circuit board, and the first signal input end is used for receiving a cathode signal.

In some embodiments, as shown in fig. 1, the edge of the cathode 3 is located in the second subregion NA12, i.e. the orthographic projection of the cathode 3 on the substrate base plate 1 does not overlap with the first subregion NA 11.

It should be noted that, because the first signal input end is located at the edge of the first peripheral area, if the cathode is electrically connected to the first signal input end in the first peripheral area, the cathode needs to be extended to be disposed at the edge of the first peripheral area, because the cathode is disposed on the whole surface, when the evaporation process is adopted, a shadow (shadow) area exists when the cathode is manufactured by using an Open Mask, if the first signal input end and the cathode are lapped at the edge of the first peripheral area, in order to ensure the lapping yield, the size of the lapping area is large, which is not beneficial to realizing a narrow frame.

The display panel that this application embodiment provided, the negative pole is connected with first switching portion electricity in the second subregion, transmits the signal of first signal input part input through first switching portion to the negative pole need not to be connected with first signal input part electricity in first subregion, is favorable to reducing the size in first peripheral zone, is favorable to realizing the narrow frame.

Fig. 4 is an enlarged schematic view of a region B in fig. 1, and fig. 5 is a cross-sectional view along FF' in fig. 4.

In some embodiments, as shown in fig. 5, the first transition portion 203 comprises: a first sub-adapter 2031 and a second sub-adapter 2032 electrically connected to the first sub-adapter 2031 in the first sub-area NA 11;

the first sub-adapter 2031 is located between the cathode and the substrate base plate 1; the second sub-adapter 2032 is located between the first sub-adapter 2031 and the substrate base plate 1, and the second sub-adapter 2032 and the first signal input terminal are disposed on the same layer and integrally connected.

In some embodiments, as shown in fig. 6, the cathode 3 is connected to the first sub-transition 2031 in the second sub-region NA 12.

Fig. 6 is a cross-sectional view taken along BB' in fig. 1.

In some embodiments, the first sub-junction is disposed in a same layer as the anode. Namely, the first sub-switching part and the anode can be formed in the same patterning process, so that the preparation process flow of the display panel can be saved, and the cost can be saved.

In some embodiments, the second sub-interposer may be disposed in the same layer as any conductive layer located between the substrate base plate and the anode. Namely, the second sub-adapter part and any conducting layer positioned between the substrate base plate and the anode can be formed in the same patterning process, so that the preparation process flow of the display panel can be saved, and the cost is saved.

In some embodiments, the first signal input terminal is disposed on the same layer as the gate of the thin film transistor; namely the second sub-switching part and the grid electrode of the thin film transistor are arranged on the same layer;

as shown in fig. 5, the first transfer portion 203 further includes: a third sub-switching portion 2033 provided on the same layer as the source S and the drain D of the thin film transistor TFT;

in the first sub-region, the third sub-transition portion 2033 is connected to the second sub-transition portion 2032 through a first via hole 601 penetrating through the first insulating layer 6, and the first sub-transition portion 2031 is connected to the third sub-transition portion 2033 through a second via hole 701 penetrating through the second insulating layer 7;

in the second sub-region, as shown in fig. 6, the cathode 3 is connected to the first sub-via 2031 through a third via 801 passing through the pixel definition layer 8.

In some embodiments, in the first sub-region, as shown in fig. 4, the first insulating layer 6 includes a plurality of first vias 601, and the second insulating layer 7 includes a plurality of second vias 701; the orthographic projection of the first via 601 on the substrate base 1 and the orthographic projection of the second via 701 on the substrate base 1 do not overlap. Thereby can guarantee the area of contact between each sub-switching portion and then improve the electrically conductive effect between each sub-switching portion in the first switching portion, the orthographic projection of first via hole and second via hole each other the non-overlapping can also guarantee the regional flatness that first switching portion corresponds, avoids influencing the overlap joint effect between each sub-switching portion.

In some embodiments, as shown in fig. 1, the third via 801 has a bar shape extending along the second direction X. Therefore, the contact area between the cathode and the first sub-switching part can be ensured, and the conductive yield of the cathode and the first sub-switching part can be ensured.

In some embodiments, as shown in fig. 7 and 8, the auxiliary electrode line 201 includes: a first sub-auxiliary electrode line 2011 extending from the display area AA to the first peripheral area NA1, and a second sub-auxiliary electrode line 2012 located at the first peripheral area NA1 and electrically connected to the first sub-auxiliary electrode line 2011;

the first sub-auxiliary electrode line 2011 is disposed on the same layer as the source and the drain of the thin film transistor or on the same layer as the gate of the thin film transistor;

the second sub-auxiliary electrode line 2012 is disposed on the same layer as the first sub-transition portion 2031, and the second sub-auxiliary electrode line 2012 is connected to the first sub-transition portion 2031 on a side of the first sub-transition portion 2031 close to the display area AA.

Fig. 7 is an enlarged schematic view of a region C in fig. 1, and fig. 8 is a cross-sectional view taken along GG' in fig. 7.

In specific implementation, as shown in fig. 8, the second sub-auxiliary electrode line 2012 is electrically connected to the first sub-auxiliary electrode line 2011 through a fourth via 702 penetrating through the second insulating layer 7. As shown in fig. 7, in a region where the second sub auxiliary electrode line 2012 is electrically connected to the first sub auxiliary electrode line 2011, the second insulating layer may include a plurality of fourth vias 702. In a specific implementation, as shown in fig. 8, the second insulating layer includes a planarization layer 704 and a protection layer 703, and a fourth via 702 penetrates through the protection layer 703 in a region where the second sub-auxiliary electrode line 2012 of the protection layer 703 is electrically connected to the first sub-auxiliary electrode line 2011.

According to the display panel provided by the embodiment of the application, the first auxiliary electrode wires connected with the cathode in the display area in the auxiliary electrode wires and the source electrode and the drain electrode of the thin film transistor are arranged on the same layer, namely the first auxiliary electrode wires and the source electrode and the drain electrode of the thin film transistor can be formed in one patterning process, and the preparation process flow of the display panel can be saved. In addition, the source electrode and the drain electrode of the thin film transistor are usually made of conductive materials with smaller resistance, that is, the resistance of the first auxiliary electrode line is smaller, and the first auxiliary electrode line is electrically connected with the cathode in the display area, so that the cathode voltage drop can be further reduced, the display brightness difference of the display panel of the top emission light-emitting device can be relieved, and the display picture uniformity of the display panel of the top emission light-emitting device can be improved.

It should be noted that, in fig. 1, the display panel includes two connecting leads 202 as an example, and the two connecting leads 202 include: the first connection lead 2021 located at the first peripheral area NA1 and/or the second connection lead 2022 located at the second peripheral area NA 2. The display panel that this application embodiment provided all includes the connecting lead who is connected with many auxiliary electrode line electricity in first peripheral area, second peripheral area to can all realize the effect of voltage drop of equalling the share at many auxiliary electrode line extending direction's both ends, more be favorable to alleviating top emission light emitting device's display panel display luminance difference, improve top emission light emitting device's display panel's display screen homogeneity.

In some embodiments, as shown in fig. 1 and 7, in the first direction Y, the first connection lead 2021 is located between the first transition portion 203 and the display area AA;

as shown in fig. 8, the first connection lead 2021 is located between the first sub auxiliary electrode line 2011 and the substrate base 1 in a direction perpendicular to the substrate base 1.

In some embodiments, as shown in fig. 2, in the display area AA, the display panel further includes a light shielding layer 9 between the substrate base plate 1 and the driving unit 6;

as shown in fig. 8, the first connection lead 2021 is provided in the same layer as the light-shielding layer. The first connecting lead and the shading layer can be formed in a patterning process, so that the preparation process flow of the display panel can be saved.

In some embodiments, as shown in fig. 2, the display panel further includes a buffer layer 15 between the light-shielding layer 9 and the active layer 14.

As shown in fig. 7, the first connection lead 2021 is electrically connected to the first sub-auxiliary electrode line 2011 through the fifth via hole 17 penetrating through the first insulating layer 6 and the buffer layer 15. Specifically, in some embodiments, the interlayer insulating layer 603 in the first insulating layer 6 extends to the peripheral region, and the fifth via 17 penetrates through the interlayer insulating layer 603 and the buffer layer 15.

In some embodiments, as shown in fig. 9, the display panel further includes: a plurality of electrostatic protection units 10 located in the first peripheral area NA 1; the esd protection unit 10 includes a plurality of first level signal input terminals 1001, and the first connection lead 2021 is electrically connected to the first level signal input terminals 1001.

The display panel that this application embodiment provided, the first level signal input of electrostatic protection unit and first connecting lead, electrostatic protection unit and negative pole sharing drive signal promptly to need not additionally to set up the relevant wiring of signal input that is connected with first level signal input electricity again, can save first peripheral area wiring space, reduce the size of first peripheral area on the first direction, be favorable to realizing narrow frame.

In a specific implementation, the first level signal input terminal is a low level signal input terminal, that is, the first level signal input terminal receives a low level signal through the first connection lead.

In some embodiments, as shown in fig. 10, 11, the second connection lead 2022 includes: a first sub-lead portion 20221, and a second sub-lead portion 20222 electrically connected to the first sub-connection lead portion 20221;

the first sub-lead portion 20221 is disposed on the same layer as and connected to the first sub-auxiliary electrode line 2011;

the second sub-lead portion 20222 is provided in the same layer as the anode 5; the cathode 3 is in contact with the second sub-lead portion 20222.

Fig. 10 is an enlarged schematic view of a region D in fig. 1, and fig. 11 is a cross-sectional view taken along HH' in fig. 10. The area corresponding to reference numeral 19 in fig. 10 is a via hole of the pixel definition layer. As shown in fig. 11, the cathode 3 and the second sub-lead portion 20222 are electrically connected by a via hole penetrating the pixel defining layer 8; the second sub-lead portion 20222 is electrically connected to the first sub-lead portion 20221 through a via hole penetrating the protective layer 703.

In some embodiments, the display panel provided in the embodiments of the present application is a transparent display panel, that is, both the display region and the peripheral region include transparent regions; the display region further includes, for example, an effective display region corresponding to the light emitting device, the effective display region being disposed at a distance from the transparent region.

In some embodiments, as shown in fig. 10, the first sub-lead portion 20221 includes: a plurality of first patterns 202211 arranged at intervals in the second direction X, and a second pattern 202212 connecting adjacent two of the first patterns.

In the display panel provided by the embodiment of the application, the outline of the first pattern included in the first sub lead part is rectangular, and the first sub lead part has a larger size than the second pattern, that is, the first sub lead part is formed by alternately connecting two patterns with different sizes, so that the wiring space of the second peripheral area can be saved, and the transmittance of the second peripheral area can be improved when the display panel is a transparent display panel.

In some embodiments, the second sub-lead portion includes: a first sub-layer arranged in the same layer as the first transparent electrode sub-layer 501, a second sub-layer arranged in the same layer as the second transparent electrode sub-layer, and a third sub-layer arranged in the same layer as the reflective electrode sub-layer 502;

as shown in fig. 10, the third sub-layer has an open area 18.

That is, the third sublayer of the reflective layer is provided with an opening region, so that the transmittance of the region corresponding to the second lead can be improved.

In practice, for example, the opening regions of the third sub-layer correspond to the first patterns one to one.

Alternatively, in some embodiments, the second sub-lead portion includes: the first transparent electrode sublayer is arranged on the same layer as the first transparent electrode sublayer and/or the second transparent electrode sublayer is arranged on the same layer as the second transparent electrode sublayer.

That is, the second sub-lead portion includes only the transparent film layer, and the transmittance of the region corresponding to the second lead can be increased.

The embodiment of the application provides a display panel, it is connected with first sub auxiliary electrode line electricity to pass through auxiliary cathode at the display area negative pole, thereby can reduce the overlap joint degree of difficulty of negative pole and first sub auxiliary electrode line, and, because first sub auxiliary electrode line is with thin-film transistor's source electrode and drain electrode layer setting, the resistance of first sub auxiliary electrode line is less, it can further reduce the cathode fall to be connected at first sub auxiliary electrode line of display area and cathode electricity, more be favorable to alleviating top emission luminescent device's display panel display luminance difference, improve top emission luminescent device's display panel's display screen homogeneity.

The display device provided by the embodiment of the application is as follows: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the present application. The display device can be implemented by referring to the above embodiments of the display panel, and repeated descriptions are omitted.

To sum up, according to the display panel provided by the embodiment of the present application, the auxiliary electrode wiring structure includes a plurality of auxiliary electrode lines, and the auxiliary electrode lines extend from the display area to the peripheral area and are electrically connected with the cathode, so that the cathode resistance can be reduced compared with a case where the cathode is separately disposed, and the cathode drop can be reduced. And the auxiliary electrode wiring structure also comprises a connecting lead electrically connected with the plurality of auxiliary electrode wires in the peripheral area, so that the voltage drop can be further shared uniformly, the display brightness difference is relieved, and the uniformity of a display picture is improved.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A display panel, comprising: the display device comprises a display area and a peripheral area surrounding the display area;

the auxiliary electrode wiring structure includes: a plurality of auxiliary electrode lines extending from the display area to the peripheral area along a first direction, and at least one connecting lead extending along a second direction and located in the peripheral area; the first direction intersects the second direction;

the auxiliary electrode wires are electrically connected with the cathode;

2. The display panel according to claim 1, wherein the peripheral region comprises: a first peripheral region and a second peripheral region respectively located on both sides of the display region in the first direction;

the first peripheral region includes: a first sub-region located at a second sub-region between the first sub-region and the display region in the first direction;

the first sub-region comprises a plurality of first signal inputs;

the first switching part is electrically connected with the first signal input end in the first sub-region, the first switching part is electrically connected with the cathode in the second sub-region, and the first switching part is electrically connected with the auxiliary electrode wires in the second sub-region;

3. The display panel according to claim 2, wherein the display panel further comprises, in the display area: a plurality of anodes located between the substrate base plate and the cathode, and a plurality of driving units located between the substrate base plate and the anodes; the driving unit includes: a thin film transistor electrically connected to the anode;

the first sub-switching part and the anode are arranged on the same layer;

the cathode is connected with the first sub-adapter part in the second sub-area.

4. The display panel according to claim 3, wherein the first signal input terminal is disposed on the same layer as the gate of the thin film transistor;

the first transition portion further includes: the third sub-switching part is arranged on the same layer as the source electrode and the drain electrode of the thin film transistor;

in the first sub-area, the third sub-switching part is connected with the second sub-switching part through a first via hole penetrating through the first insulating layer, and the first sub-switching part is connected with the third sub-switching part through a second via hole penetrating through the second insulating layer;

in the second sub-area, the cathode is connected with the first sub-switching part through a third via hole penetrating through the pixel definition layer.

5. The display panel according to claim 4, wherein in the first sub-region, the first insulating layer includes a plurality of the first vias, and the second insulating layer includes a plurality of the second vias;

the third via hole is in the shape of a strip extending along the second direction.

6. The display panel according to any one of claims 3 to 5, wherein the auxiliary electrode lines include: the display panel comprises a first auxiliary electrode sub-line extending from the display area to the first peripheral area, and a second auxiliary electrode sub-line located in the first peripheral area and electrically connected with the first auxiliary electrode sub-line;

the first auxiliary electrode wire and the source electrode and the drain electrode of the thin film transistor are arranged on the same layer or on the same layer as the grid electrode of the thin film transistor;

7. The display panel according to claim 6, wherein at least one of the connecting leads comprises: a first connecting lead located at the first peripheral region and/or a second connecting lead located at the second peripheral region.

8. The display panel according to claim 7, wherein in the first direction, the first connection lead is located between the first transfer portion and the display region;

the first connection lead is located between the first sub auxiliary electrode line and the base substrate in a direction perpendicular to the base substrate.

9. The display panel according to claim 8, wherein the display panel further comprises a light shielding layer between the base substrate and the driving unit in the display region; the first connecting lead and the shading layer are arranged on the same layer.

10. The display panel according to claim 8 or 9, characterized by further comprising: a plurality of electrostatic protection units located in the first peripheral region; the electrostatic protection unit comprises a plurality of first level signal input ends, and the first connecting lead is electrically connected with the first level signal input ends.

11. The display panel according to claim 7, wherein the second connection lead comprises: a first sub-lead portion and a second sub-lead portion electrically connected to the first sub-connection lead;

the first sub-lead part and the first sub-auxiliary electrode line are arranged on the same layer and are connected;

the second sub-lead portion and the anode are arranged on the same layer; the cathode is in contact with the second sub-lead portion.

12. The display panel according to claim 11, wherein the anode comprises: the first transparent electrode sublayer, the reflecting electrode sublayer and the second transparent electrode sublayer are stacked;

13. The display panel according to claim 11, wherein the anode comprises: the first transparent electrode sublayer, the reflecting electrode sublayer and the second transparent electrode sublayer are stacked;

the third sublayer has a plurality of open areas.

14. The display panel according to any one of claims 7 to 9 and 11 to 13, wherein the display panel further comprises a plurality of auxiliary cathodes disposed in the same layer as the anodes and insulated from each other in the display region, wherein the cathodes are electrically connected to the auxiliary cathodes, and the auxiliary cathodes are electrically connected to the first auxiliary sub-electrode lines.

15. A display device characterized by comprising the display panel according to any one of claims 1 to 14.