Display panel and display device

Abstract

The embodiment of the present application provides a display panel and a display device, wherein the display panel includes a substrate and a plurality of pixel units arranged in an array on one side of the substrate, wherein the pixel unit includes a first electrode, a second electrode and an organic functional layer located between the first electrode and the second electrode, wherein the second electrode is away from the substrate relative to the first electrode; the display panel includes a transparent display area, wherein the transparent display area includes a pixel area and a wiring area, wherein the pixel unit is arranged in the pixel area, and the wiring area is adjacent to the pixel area; the display panel also includes an auxiliary wiring located in the wiring area, wherein the auxiliary wiring is made of a transparent conductive material and extends to the outside of the transparent display area and is connected to the second electrode signal line; and the second electrode is overlapped with the auxiliary wiring. With such a design, the conductivity of the transparent conductive material is better, the contact area between the second electrode and the auxiliary wiring can be larger, and the problem of excessive overlap resistance can be improved; and the optical uniformity and reliability of the display panel are improved without reducing the transmittance.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of transparent display technology, and in particular to a display panel and an electronic device. Background Art

[0002] OLED (organic light emitting diode) display panels are widely used in various display fields due to their advantages such as self-luminescence, wide viewing angle and fast response speed.

[0003] Transparent display is an important development direction of OLED display panels. In OLED transparent display panels, in order to improve transmittance, the cathode of the pixel unit is usually made using the FMM (Fine Metal Mask) process, and the connection between the cathodes is also made with patterned cathode materials, that is, the cathode material is used as a connecting line to connect the cathodes corresponding to the pixel units in the transparent display area.

[0004] However, the cathode material has a relatively large resistance, and in order to increase transmittance, the width of the connecting line between the cathodes will be compressed as much as possible, which will further lead to the problem of excessive cathode overlap resistance, and then lead to poor brightness uniformity and reliability in the transparent display area. Summary of the invention

[0005] In view of this, an object of the embodiments of the present application is to provide a display panel and a display device.

[0006] In a first aspect, an embodiment of the present application provides a display panel, comprising a base substrate and a plurality of pixel units arranged in an array on one side of the base substrate, wherein the pixel unit comprises a first electrode, a second electrode and an organic functional layer located between the first electrode and the second electrode, wherein the second electrode is away from the base substrate relative to the first electrode;

[0007] The display panel comprises a transparent display area, the transparent display area comprises a pixel area and a wiring area, the pixel unit is arranged in the pixel area, and the wiring area is adjacent to the pixel area;

[0008] The display panel further includes an auxiliary wiring located in the wiring area. The auxiliary wiring is made of a transparent conductive material and extends to the outside of the transparent display area to be connected to the second electrode signal line. The second electrode is overlapped with the auxiliary wiring.

[0009] Compared with the prior art method of connecting the cathode with a connecting line formed by cathode material, the transparent conductive material has better conductivity, the contact area between the second electrode and the auxiliary wiring can be larger, and the problem of excessive cathode overlap resistance can be effectively improved; and the transparent conductor material can ensure that the transmittance of the transparent display area is not affected, that is, the optical uniformity and reliability of the display panel and the display device are improved without reducing the transmittance.

[0010] In a possible implementation manner, in an orthographic projection onto the substrate, the second electrode partially overlaps with the auxiliary trace.

[0011] In a possible implementation manner, the second electrode includes an electrode body and a lap portion, and the lap portion extends from the electrode body to the auxiliary wiring;

[0012] In an orthographic projection onto the base substrate, the electrode body and the auxiliary wiring do not overlap, and the overlapping portion and the auxiliary wiring at least partially overlap.

[0013] In a possible implementation manner, the auxiliary routing includes a first auxiliary routing and a second auxiliary routing that cross and extend;

[0014] In an orthographic projection onto the base substrate, the orthographic projections of the first auxiliary routing line and the second auxiliary routing line overlap in an intersection region, and the orthographic projection of the overlapping portion overlaps with the intersection region.

[0015] In a possible embodiment, the pixel unit includes multiple sub-pixels, the first electrode includes first sub-electrodes corresponding one-to-one to the sub-pixels, the second electrode is a common electrode corresponding to the sub-pixels in the pixel unit, and the organic functional layer includes an organic light-emitting layer corresponding to the sub-pixels.

[0016] In a possible implementation manner, the first electrode is an anode, the second electrode is a cathode, the auxiliary wiring and the first electrode are in the same layer; and the auxiliary wiring is formed by crystallizing a transparent conductive material.

[0017] In a possible implementation, the transparent conductive material includes at least one of indium tin oxide, indium zinc oxide, aluminum-doped zinc oxide and a transparent conductive film, and has a thickness greater than 1 nm.

[0018] In a possible implementation manner, in an orthographic projection onto the base substrate, the organic functional layer and the auxiliary trace have an overlapping portion in an orthographic projection onto the base substrate;

[0019] An isolation column is arranged on a side of the auxiliary wiring away from the base substrate, and the organic functional layer is disconnected at the position of the isolation column.

[0020] In a possible implementation manner, the overlapping position between the second electrode and the auxiliary wiring is a first overlapping position, and the isolation column is disposed at a position close to the pixel region relative to the first overlapping position.

[0021] In a possible implementation manner, an outward inclination angle of an outer peripheral cylindrical surface of the isolation column relative to the base substrate is greater than 70 degrees.

[0022] In a possible implementation manner, the isolation column is an undercut structure relative to the substrate.

[0023] In a possible implementation manner, the extension distance of the isolation column in a direction perpendicular to the substrate is less than Along a direction parallel to the base substrate, the undercut depth of the isolation column is less than 0.5 um.

[0024] In a possible implementation manner, the isolation column is a stacked structure of titanium / aluminum / titanium, or a stacked structure of any combination of silicon oxide, silicon nitride and silicon oxynitride.

[0025] In a possible implementation, the display panel includes the base substrate and a barrier layer disposed on one side of the base substrate, and in the pixel region, the display panel further includes a driving circuit layer, a planarization layer, a pixel defining layer, the first electrode, the organic functional layer, and the second electrode stacked on a side of the barrier layer away from the base substrate;

[0026] In the wiring area, the display panel further includes the auxiliary wiring arranged on a side of the barrier layer away from the base substrate.

[0027] In a second aspect, embodiments of the present application also provide a display device, comprising a display panel as described in any one of the embodiments of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only one or more embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A front schematic diagram of a display panel provided in an embodiment of the present application;

[0030] Figure 2 A hierarchical schematic diagram of a display panel provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of an OLED pixel unit and auxiliary wiring provided in an embodiment of the present application;

[0032] Figure 4 for Figure 2 Structural schematic diagrams of different implementations of the middle isolation column;

[0033] Figure 5 A schematic diagram of an OLED pixel unit and auxiliary wiring provided in another embodiment of the present application;

[0034] Figure 6 A schematic diagram of an OLED pixel unit and auxiliary wiring provided in another embodiment of the present application;

[0035] Figure 7 A schematic diagram of an OLED pixel unit and auxiliary wiring provided in another embodiment of the present application.

[0036] Description of reference numerals:

[0037] 1-display area, 2-peripheral area, 3-OLED pixel unit, 4-auxiliary wiring, 5-base substrate, 6-barrier layer, 7-second electrode, 8-isolation column, 9-organic functional layer, 10-pixel definition layer, 11-first electrode, 12-flat layer, 13-driving circuit layer, 14-first evaporation area, 15-second evaporation area, 16-electrode body, 17-lapping part;

[0038] 100: pixel area, 200: routing area. DETAILED DESCRIPTION

[0039] In the OLED transparent display panel provided by the related art, the cathode of the OLED pixel unit is usually made by FMM (Fine Metal Mask) process, and the cathodes are also connected by patterned cathode materials. The cathode material is used as a connecting line to connect the cathodes corresponding to the pixel units in the transparent display area.

[0040] However, the cathode material has a relatively large resistance, and in order to increase transmittance, the width of the connecting line between the cathodes will be compressed as much as possible, which will further lead to the problem of excessive cathode overlap resistance, and then lead to poor brightness uniformity and reliability in the transparent display area.

[0041] In view of this, the embodiments of the present application provide a display panel and a display device, in which in the transparent display area of ​​the display panel, auxiliary wiring is made between pixel units using transparent conductive materials, the auxiliary wiring extends to the outside of the transparent display area and is connected to the second electrode signal line, the cathode in the pixel unit is directly overlapped with the auxiliary wiring, and the second electrode signal line provides a power signal to the cathode in the transparent display area through the auxiliary wiring. Such a design can ensure that the cathode and the auxiliary wiring have a large overlap area, effectively improving the problem of excessive cathode overlap resistance; and the transparent conductive material can ensure that the transmittance of the transparent display area is not affected, that is, it is guaranteed without reducing the transmittance, thereby improving the optical uniformity and reliability of the display panel and the display device.

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] Figure 1 A front view of a display panel provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the display panel includes a display area 1 (Active Area, referred to as AA area) and a peripheral area 2 located outside the display area 1. The display area 1 is the area of ​​the display panel used to realize display. The display panel is provided with a plurality of pixel units in the display area 1, and the plurality of pixel units are arranged in an array to form a pixel array.

[0044] The pixel array includes a plurality of pixel units arranged in a first direction to form a pixel row, and a plurality of pixel units arranged in a second direction to form a pixel column, the first direction is perpendicular to the second direction, and the pixel rows are arranged in a first direction to form a pixel row. Figure 1 Taking the orientation shown in as an example, the first direction is the horizontal direction and the second direction is the vertical direction. In the pixel array, there are multiple pixel rows arranged along the second direction and multiple pixel columns arranged along the first direction. The first direction is the pixel row direction of the pixel array, and the second direction is the pixel column direction of the pixel array.

[0045] The pixel unit is an OLED (Organic Light-Emitting Diode) pixel unit 3, each OLED pixel unit 3 includes a plurality of OLED sub-pixels, each OLED sub-pixel is a light-emitting device capable of emitting a single color, and when the display panel is displaying, color display is achieved by controlling the light emission of the OLED sub-pixels in each OLED pixel unit 3.

[0046] In some possible embodiments, the OLED pixel unit 3 includes a first OLED sub-pixel, a second OLED sub-pixel and a third OLED sub-pixel, the first OLED sub-pixel is a G sub-pixel capable of emitting green light, the second OLED sub-pixel is an R sub-pixel capable of emitting red light, and the third OLED sub-pixel is a B sub-pixel capable of emitting blue light.

[0047] The OLED sub-pixels in the OLED pixel unit 3 may be arranged in various ways, for example, RGB arrangement, PenTile arrangement (P arrangement for short), Delta arrangement (D arrangement for short), Diamond arrangement, RGB-Delta arrangement, etc.

[0048] In the laminated structure, the OLED pixel unit 3 includes a first electrode, an organic functional layer, and a second electrode. The organic functional layer is located between the first electrode and the second electrode. By controlling the first electrode and the second electrode, the light emission of the organic functional layer can be achieved. One of the first electrode and the second electrode is an anode, and the other of the first electrode and the second electrode is a cathode. In this embodiment, the first electrode is an anode and the second electrode is a cathode.

[0049] The first electrode includes first sub-electrodes corresponding one-to-one to all OLED sub-pixels in the OLED pixel unit 3, and the second electrode is a common electrode corresponding to all OLED sub-pixels in the OLED pixel unit 3. The organic functional layer includes an organic light-emitting layer corresponding to all OLED sub-pixels in the OLED pixel unit 3, which is different from the organic light-emitting layers corresponding to OLED sub-pixels of different colors.

[0050] The organic functional layer may further include at least one of a hole transport layer (HTL), a hole injection layer (HIL), an electron transport layer (ETL) and / or an electron injection layer (EIL) to improve the luminous efficiency of the organic light emitting layer. The hole transport layer (HTL), the hole injection layer (HIL), the electron transport layer (ETL) and the electron injection layer (EIL) are usually used as a common layer in the OLED pixel unit 3, corresponding to all OLED sub-pixels.

[0051] The display panel includes a driving circuit for controlling OLED sub-pixels, the driving circuit includes a plurality of scan lines (Gate) and a plurality of data lines (Data) arranged crosswise, and also includes a plurality of thin film transistors (TFT) corresponding to the OLED sub-pixels. The thin film transistor includes a gate, a source and a drain, the drain of the thin film transistor is connected to the first sub-electrode of the corresponding OLED sub-pixel, the gate of the thin film transistor is connected to the scan line, and the source of the thin film transistor is connected to the data line.

[0052] The second electrode in the OLED pixel unit 3 is connected to a second electrode signal line through a wiring. The second electrode signal line is a power signal line VSS. The power signal line VSS provides a common voltage for all OLED sub-pixels in the OLED pixel unit 3 through the second electrode.

[0053] The display panel provided in the embodiment of the present application is a transparent display panel, and at least part of the display area 1 should be a transparent display area, or the entire display area 1 is a transparent display area. This embodiment is described by taking the entire display area 1 as an example.

[0054] The display panel includes a pixel area and a wiring area in the display area 1. The area corresponding to the pixel unit in the display panel is defined as the pixel area in this article. The pixel area generally refers to the light-emitting area of ​​the OLED pixel unit 3, and can also be understood as the area corresponding to the first electrode in the OLED pixel unit 3. The wiring area is an area adjacent to the pixel area and is located at the periphery of the OLED pixel unit 3. It can be seen from the above description that the wiring area includes a first area extending along the pixel row direction between adjacent pixel rows, and a second area extending along the pixel column direction between adjacent pixel columns; the first area and the second area form a plurality of cross-connected areas.

[0055] The display panel is provided with auxiliary wiring 4 made of transparent conductive material in the wiring area, and the auxiliary wiring 4 extends along the pixel row direction in the first area of ​​the wiring area, and extends along the pixel column direction in the second area of ​​the wiring area, forming a plurality of crossed wiring structures. In the projection onto the base substrate, the second electrode of the OLED pixel unit 3 overlaps with the auxiliary wiring 4 in the wiring area on at least one side, and the second electrode is directly overlapped with the auxiliary wiring 4.

[0056] The display panel is provided with a second electrode signal line in the peripheral area 2, and the auxiliary line 4 extends to the outside of the display area 1 and is connected to the second electrode signal line through a switching structure, thereby realizing the connection between the second electrode signal line and the second electrode in the OLED sub-pixel in the display area 1.

[0057] Figure 2 A hierarchical schematic diagram of a display panel provided in an embodiment of the present application, such as Figure 2 As shown, the display panel includes a base substrate 5 and a buffer layer (Buffer) 6 arranged on one side of the base substrate 5. The base substrate 5 may be a rigid plate, such as a glass plate, a quartz plate or an acrylic plate; the base substrate 5 may also be a bendable flexible substrate, which may be made of polymer materials such as polyimide (PI), polycarbonate (PC), polyether sulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyarylate (PAR) or glass fiber reinforced plastic (FRP).

[0058] The barrier layer 6 is disposed on one side of the base substrate 5 and is an inorganic insulating film layer. It can be made of a silicon-containing inorganic material and can be a multi-layer or single-layer structure. The silicon-containing inorganic material can be at least one of silicon oxide SiO2, silicon nitride SiNx, and silicon oxynitride SiON. In this design, the material properties of the inorganic material are utilized to isolate the base substrate 5 and the structure on the base substrate 5, reduce or block the penetration of foreign matter, moisture, or external air from the base substrate 5, and provide a flat surface.

[0059] In the pixel area 100 , the display panel includes a driving circuit layer 13 , a planarization layer 12 (PLN), a pixel definition layer (PDL) 10 , a first electrode 11 , an organic functional layer 9 and a second electrode 7 stacked on a side of a barrier layer 6 away from a base substrate 5 .

[0060] The driving circuit layer 13 is located on the side of the barrier layer 6 away from the base substrate 5, and includes thin film transistors, and cross-arranged data lines and scan lines. The thin film transistor can be a top-gate type, a bottom-gate type or a double-gate type in terms of structure type, and can be a LTPS-TFT (low-temperature polycrystalline silicon thin film transistor), IGZO-TFT (indium gallium zinc oxide thin film transistor) and LTPO-TFT (low-temperature polycrystalline oxide thin film transistor) in terms of material type.

[0061] A flat layer 12 is disposed on the side of the driving circuit layer 13 away from the barrier layer 6 . The flat layer 12 covers the driving circuit layer 13 and has a flat surface on the side away from the driving circuit layer 13 . The flat surface facilitates the manufacturing and molding of the structure above it.

[0062] A pixel defining layer 10 is disposed on one side of the planar layer 12 away from the driving circuit layer 13, and the pixel defining layer 10 has a pixel opening. The first sub-electrode in the OLED sub-pixel is disposed between the pixel defining layer 10 and the planar layer 12, connected to the thin film transistor in the driving circuit layer 13 through a via hole, and exposed through the pixel opening; the pixel defining layer 10 surrounds the first sub-electrode.

[0063] The organic functional layer 9 is arranged in the pixel area 100 , wherein the organic light emitting layer is arranged corresponding to the pixel opening, and the common electrode is arranged on a side of the organic functional layer 9 away from the first electrode 11 , and extends to the auxiliary wiring 4 in the wiring area, and is directly overlapped with the auxiliary wiring 4 .

[0064] The organic functional layer 9 and the second electrode 7 can be made by an open mask (OPM) evaporation process. In the first mask for making the organic functional layer 9, several OLED sub-pixels are grouped together, and one evaporation hole is opened in each group, and the organic functional layer 9 in the OLED sub-pixels in the group is simultaneously evaporated through the evaporation hole.

[0065] For example, in the present embodiment, the first mask plate includes a first evaporation area corresponding to each OLED pixel unit 3, all OLED sub-pixels in each OLED pixel unit 3 are grouped together, and a first evaporation area is opened together, and the organic functional layer 9 of all OLED sub-pixels in the OLED pixel unit 3 is evaporated through the first evaporation area. Such a design facilitates reducing the number of openings of the first mask plate and improving the evaporation efficiency.

[0066] It can be seen from the above description that the OLED sub-pixels in the OLED pixel unit 3 use the same second electrode 7. The second mask for making the second electrode 7 includes a second evaporation area, and the second electrode 7 corresponding to the OLED pixel unit 3 is made through the second evaporation area.

[0067] In the wiring area 200 of the display panel, the display panel includes an auxiliary wiring 4 arranged on the side of the barrier layer 6 away from the base substrate 5. That is to say, the display panel retains the film layer structure in the pixel area 100, and digs out the organic / inorganic / metal film layer as much as possible in the wiring area 200 to improve the transmittance. The auxiliary wiring 4 is made of transparent conductive material. Such a design can ensure that the setting of the auxiliary wiring 4 does not affect the transmittance. The transparent conductive material can be at least one of indium tin oxide ITO, indium zinc oxide IZO and aluminum-doped zinc oxide AZO.

[0068] This embodiment takes ITO as an example, and the thickness is greater than 0.1nm. ITO is crystallized after being baked at high temperature (greater than 200°C), and the first electrode 11 is made after the auxiliary wiring 4 is crystallized. This design allows the auxiliary wiring 4 to be in the same layer as the first electrode 11, and the etching solution in the process of making the first electrode 11 will not etch away the crystallized ITO, thereby saving the process flow.

[0069] Figure 3 A schematic diagram of an OLED pixel unit and auxiliary wiring provided in an embodiment of the present application, such as Figure 3 As shown, the figure includes a first evaporation region 14, a second evaporation region 15, and an organic functional layer and a second electrode made by the first evaporation region 14 and the second evaporation region 15. In the orthographic projection to the base substrate 5, the second evaporation region 15 covers the first evaporation region 14 and has an overhanging portion, and the overhanging portion at least partially overlaps with the projection of the auxiliary wiring 4; so that the organic functional layer 9 and the common electrode made by the first evaporation region 14 and the second evaporation region 15 meet the following conditions:

[0070] The second electrode covers the organic functional layer and has a protruding portion; the portion of the second electrode protruding from the organic functional layer is directly overlapped with the auxiliary wiring 4. Compared with the prior art method of connecting the cathode with a connecting wire formed by a cathode material, the transparent conductive material has better conductivity, and the contact area between the second electrode and the auxiliary wiring 4 is larger, which can effectively improve the problem of excessive cathode overlap resistance; and the transparent conductive material can ensure that the transmittance of the transparent display area is not affected, that is, it is guaranteed without reducing the transmittance, thereby improving the optical uniformity and reliability of the display panel and the display device.

[0071] Please also refer to Figure 2 In this article, the second evaporation region 15 is defined to include a first sub-region and a second sub-region located outside the first sub-region. In the orthographic projection onto the base substrate 5, the first sub-region completely overlaps with the first evaporation region 14, and both the first evaporation region 14 and the second sub-region have a portion overlapping with the auxiliary wiring 4, that is, the second electrode 7 and the organic functional layer 9 are both overlapped with the auxiliary wiring 4, and the overlapping position of the second electrode 7 and the auxiliary wiring 4 is defined as the first overlapping position, and the overlapping position of the organic functional layer 9 and the auxiliary wiring 4 is defined as the second overlapping position, and the first overlapping position is far away from the pixel area 100 relative to the first overlapping position.

[0072] Since the second electrode 7 and the organic functional layer 9 are both overlapped with the auxiliary wiring 4, and the organic functional layer 9 is a film layer with good conductivity, the signal distance between the first electrode 11 and the second electrode 7 is relatively close, usually less than 20um, which is prone to leakage. In view of this, an isolation column 8 is provided on the auxiliary wiring 4, and the organic functional layer 9 is disconnected at the position of the isolation column 8. The isolation column 8 cuts off the extension of the organic functional layer 9 between the pixel area 100 and the wiring area 200, while keeping the second electrode 7 connected, thereby improving the leakage problem caused by the close signal distance between the first electrode 11 and the second electrode 7.

[0073] In this embodiment, the isolation column 8 is arranged at the second overlapping position and is a columnar structure extending in a direction perpendicular to the base substrate 5 . The inclination angle of its outer peripheral cylindrical surface relative to the base substrate 5 is greater than 70 degrees to ensure a better isolation effect on the organic functional layer 9 .

[0074] Figure 4 for Figure 2 Schematic diagram of the structure of different embodiments of the isolation column; in another possible embodiment, the isolation column 8 is an undercut structure relative to the substrate 5. For example, the extension distance of the isolation column 8 in the direction perpendicular to the substrate 5 is less than Along the direction parallel to the base substrate 5 , the undercut depth of the isolation column 8 is less than 0.5 um.

[0075] The isolation column 8 can be titanium Ti / aluminum Al / titanium Ti, and an undercut structure formed by dry etching + wet etching process, or it can be an undercut structure formed by free combination of inorganic silicon oxide SiOx, silicon nitride SiNx, and silicon oxynitride SiON using dry etching process.

[0076] Figure 4 for Figure 2 Schematic cross-sectional views of different implementations of the isolation column, such as Figure 4 As shown, the embodiment of the present application provides three implementation methods of the isolation column 8, and the cross-sectional shapes of the three isolation columns 8 are: one is an inverted trapezoid with a long side on the side away from the substrate, one is an "I" shape with a concave middle part, and one is a T-shape with a "large top and small bottom".

[0077] With respect to the display panel in the above embodiment, the embodiment of the present application also provides a method for manufacturing the display panel, the manufacturing method comprising:

[0078] Step S10: providing a base substrate 5, and manufacturing a barrier layer 6, a driving circuit layer 13 and a planar layer 12 on the base substrate 5;

[0079] Step S20: the display panel includes a pixel area 100 corresponding to the pixel unit and a wiring area 200 adjacent to the pixel area 100; in the wiring area 200, the organic / inorganic / metal film layer on the side of the barrier layer 6 away from the base substrate 5 is removed;

[0080] Step S30: using ITO patterning to produce auxiliary wiring 4 located in the wiring area; and baking at high temperature to crystallize the ITO auxiliary wiring 4;

[0081] Step S40: isolating a column 8 on a side of the ITO auxiliary trace 4 away from the base substrate 5;

[0082] Step S50: manufacturing the first electrode 11;

[0083] Since the ITO auxiliary wiring 4 is crystallized, the etching solution of the first electrode 11 can prevent the crystallized ITO auxiliary wiring 4 from being etched away; thereby, the ITO auxiliary wiring 4 is retained and the first electrode 11 forms a desired pattern;

[0084] Step S60: manufacturing a pixel definition layer 10;

[0085] A pixel defining layer 10 is manufactured to form a pixel opening exposing the first electrode 11. If the remaining area does not need to be protected by the pixel defining layer 10, it can be removed to improve the transmittance;

[0086] Step S70 : evaporating the organic functional layer 9 and the second electrode 7 .

[0087] The second electrode 7 is directly connected to the auxiliary wiring 4 .

[0088] In the above-mentioned manufacturing method provided in the embodiment of the present application, the ITO auxiliary wiring 4 is always exposed before evaporation, and when the organic functional layer 9 and the second electrode 7 are designed, it is always ensured that the evaporated part of the second electrode 7 material is directly overlapped with the ITO auxiliary wiring 4 (connected to the VSS wiring), and the overlapping area is ensured not to affect the optical uniformity and reliability.

[0089] In the above embodiment, the organic functional layer 9 and the second electrode 7 are both manufactured by vapor deposition, but the present application is not limited thereto. For example, it can be implemented by inkjet printing, laser thermal transfer, spin coating, vacuum evaporation and other processes as long as the above structural features are met.

[0090] Figure 5 A schematic diagram of an OLED pixel unit and auxiliary wiring provided in another embodiment of the present application is shown in FIG. Figure 5 As shown, in a possible implementation, the second electrode 7 includes an electrode body 16 and a lap portion 17. In the orthographic projection to the substrate, the electrode body 16 and the organic functional layer 9 do not overlap with the auxiliary wiring 4, and the lap portion 17 at least partially overlaps with the auxiliary wiring 4. That is, the lap portion 17 extends from the electrode body 16 toward the auxiliary wiring 4 to form a structure similar to a "tail" to achieve lap connection. With such a design, while ensuring the normal lap connection between the second electrode 7 and the auxiliary wiring 4, the isolation column 8 may not be made.

[0091] Optionally, the auxiliary routing line 4 includes a first auxiliary routing line and a second auxiliary routing line that cross and extend, and in an orthographic projection onto the substrate, the orthographic projections of the first auxiliary routing line and the second auxiliary routing line overlap in an intersection area, and the orthographic projection of the overlap portion 17 overlaps with the intersection area.

[0092] Figure 6 A schematic diagram of an OLED pixel unit and auxiliary wiring provided in another embodiment of the present application, Figure 7 A schematic diagram of an OLED pixel unit and auxiliary wiring provided in another embodiment of the present application, Figure 6 and Figure 7 In each of them, a first evaporation region 14, a second evaporation region 15, an organic functional layer and a second electrode made by a first mask and a second mask, and an auxiliary wiring 4 are included; Figure 3 The difference between the embodiments lies in the pixel arrangement of the OLED sub-pixels in the OLED pixel unit 3 .

[0093] An embodiment of the present application also provides a display device, which includes the display panel in the above embodiment. The display device can be a mobile phone, a tablet computer, a laptop computer, a monitor, a television, an outdoor large screen, a conference room tablet or a smart wearable device, etc.

[0094] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0095] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0096] In addition, the technical features involved in the different embodiments of the present application described above can be combined with each other as long as they do not conflict with each other.

[0097] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A display panel, characterized in that: It comprises a base substrate and a plurality of pixel units arranged in an array on one side of the base substrate, wherein the pixel unit comprises a first electrode, a second electrode and an organic functional layer located between the first electrode and the second electrode, and the second electrode is farther away from the base substrate than the first electrode; The display panel comprises a transparent display area, the transparent display area comprises a pixel area and a wiring area, the pixel unit is arranged in the pixel area, and the wiring area is adjacent to the pixel area; The display panel further includes an auxiliary wiring located in the wiring area. The auxiliary wiring is made of a transparent conductive material and extends to the outside of the transparent display area to be connected to the second electrode signal line. The second electrode is overlapped with the auxiliary wiring.

2. The display panel according to claim 1, characterized in that: In an orthographic projection onto the base substrate, the second electrode partially overlaps with the auxiliary trace.

3. The display panel according to claim 1, characterized in that: The second electrode comprises an electrode body and a lap portion, wherein the lap portion extends from the electrode body to the auxiliary wiring; In an orthographic projection onto the base substrate, the electrode body and the auxiliary wiring do not overlap, and the overlapping portion and the auxiliary wiring at least partially overlap.

4. The display panel according to claim 3, characterized in that: The auxiliary routing includes a first auxiliary routing and a second auxiliary routing that cross and extend; In an orthographic projection onto the base substrate, the orthographic projections of the first auxiliary routing line and the second auxiliary routing line overlap in an intersection region, and the orthographic projection of the overlapping portion overlaps with the intersection region.

5. The display panel according to claim 1, characterized in that: The pixel unit includes a plurality of sub-pixels, the first electrode includes first sub-electrodes corresponding to the sub-pixels one by one, the second electrode is a common electrode corresponding to the sub-pixels in the pixel unit, and the organic functional layer includes an organic light-emitting layer corresponding to the sub-pixels.

6. The display panel according to any one of claims 1 to 5, characterized in that: The first electrode is an anode, the second electrode is a cathode, the auxiliary wiring and the first electrode are in the same layer; the auxiliary wiring is formed by crystallizing a transparent conductive material.

7. The display panel according to claim 6, characterized in that: The transparent conductive material includes at least one of indium tin oxide, indium zinc oxide, aluminum-doped zinc oxide and a transparent conductive film, and has a thickness greater than 1 nm.

8. The display panel according to claim 1, characterized in that: In an orthographic projection onto the base substrate, the organic functional layer and the auxiliary wiring have an overlapping portion in the orthographic projection onto the base substrate; An isolation column is arranged on a side of the auxiliary wiring away from the base substrate, and the organic functional layer is disconnected at the position of the isolation column.

9. The display panel according to claim 8, characterized in that: The overlapping position of the second electrode and the auxiliary wiring is a first overlapping position, and the setting position of the isolation column is close to the pixel area relative to the first overlapping position.

10. The display panel according to claim 8, characterized in that: The outer peripheral cylindrical surface of the isolation column has an outward inclination angle greater than 70 degrees relative to the base substrate.

11. The display panel according to claim 8, characterized in that: The isolation column is an undercut structure relative to the base substrate.

12. The display panel according to claim 11, characterized in that: The extension distance of the isolation column in the direction perpendicular to the substrate is less than Along a direction parallel to the base substrate, the undercut depth of the isolation column is less than 0.5 um.

13. The display panel according to any one of claims 8 to 12, characterized in that: The isolation column is a stacked structure of titanium / aluminum / titanium, or a stacked structure of any combination of silicon oxide, silicon nitride and silicon oxynitride.

14. The display panel according to claim 1, characterized in that: The display panel includes the base substrate and a barrier layer arranged on one side of the base substrate. In the pixel area, the display panel further includes a driving circuit layer, a flat layer, a pixel defining layer, the first electrode, the organic functional layer and the second electrode stacked on the side of the barrier layer away from the base substrate. In the wiring area, the display panel further includes the auxiliary wiring arranged on a side of the barrier layer away from the base substrate.

15. A display device, characterized in that: A display panel comprising any one of claims 1-14.

Images