Anode layer structure, display panel and display device

Abstract

The utility model discloses an anode layer structure, a display panel and a display device. The anode layer structure comprises a first anode layer structure and a second anode layer structure surrounding the first anode layer structure; the first anode layer structure comprises a first conductive polymer layer; the second anode layer structure comprises a second conductive polymer layer, a silver nanowire layer and a modification layer; wherein the silver nanowire layer is located on the surface of the second conductive polymer layer, and the modification layer is located on the surface of the side, away from the second conductive polymer layer, of the silver nanowire layer; the second conductive polymer layer is in contact with the first conductive polymer layer. According to the embodiment of the utility model, the flexible display requirement can be met, and the service life of the OLED device is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially relates to an anode layer structure, display panel and display device. BACKGROUND

[0002] In the display technical field, passive matrix organic light-emitting diode (PMOLED) is a common organic light-emitting display technology.

[0003] The traditional PMOLED display panel adopts indium tin oxide (ITO) as the material of anode layer and adopts aluminum as the material of anode lead. However, ITO is fragile and difficult to adapt to the demand of flexible display; the aluminum lead has a greater impact on the service life of OLED device. SUMMARY

[0004] The utility model provides a kind of anode layer structure, display panel and display device, to solve the problem that anode layer is difficult to adapt to the demand of flexible display and the greater impact of anode lead on device service life.

[0005] In a first aspect, an anode layer structure is provided, comprising: a first anode layer structure and a second anode layer structure surrounding the first anode layer structure.

[0006] The first anode layer structure includes a first conductive polymer layer.

[0007] The second an 1e layer structure includes a second conductive polymer layer, a silver nanowire layer and a modification layer; wherein the silver nanowire layer is located on the surface of the second conductive polymer layer, and the modification layer is located on the surface of the side of the silver nanowire layer away from the second conductive polymer layer.

[0008] The second conductive polymer layer is in contact with the first conductive polymer layer.

[0009] Optionally, the first conductive polymer layer and the second conductive polymer layer include a PEDOT:PSS film layer.

[0010] Optionally, the modification layer includes a molybdenum trioxide film layer.

[0011] Optionally, the thickness range of the first conductive polymer layer and the thickness range of the second conductive polymer layer both include 30-70 nm.

[0012] Optionally, the thickness range of the silver nanowire layer includes 20-50 nm.

[0013] Optionally, the thickness of the modification layer ranges from 3nm to 7nm.

[0014] Optionally, the orthographic projection of the silver nanowire layer on a horizontal plane completely overlaps with the orthographic projection of the modification layer on the horizontal plane.

[0015] The orthographic projection of the second conductive polymer layer on a horizontal plane at least partially overlaps with the orthographic projection of the silver nanowire layer on the horizontal plane.

[0016] Optionally, the first conductive polymer layer comprises a first conductive part and a second conductive part.

[0017] The second conductive part is arranged protruding from the edge of the first conductive part, and the second conductive part partially overlaps with the silver nanowire layer.

[0018] In a second aspect, a display panel is provided, comprising: a display area and a non-display area surrounding the display area.

[0019] The display panel further comprises an array substrate, a light-emitting layer, a cathode layer, and an anode layer structure as any of the embodiments of the first aspect.

[0020] The anode layer structure is located on the surface of the array substrate, the light-emitting layer is located on the side of the anode layer structure away from the array substrate, and the cathode layer is located on the side of the light-emitting layer away from the anode layer structure.

[0021] The first anode layer structure of the anode layer structure is located in the display area, and the second anode layer structure is located in the non-display area.

[0022] In a third aspect, a display device is provided, comprising the display panel of any of the embodiments of the second aspect.

[0023] The anode layer structure provided in the embodiments of the present application, wherein the first anode layer structure for controlling the light-emitting of each light-emitting unit comprises a first conductive polymer layer, and the second anode layer structure surrounding the first anode layer structure comprises a second conductive polymer layer, a silver nanowire layer and a modification layer. The first conductive polymer layer has good conductivity, replaces ITO in the related art as an anode, can improve the conductivity without affecting the light transmittance, and can better adapt to the demand of flexible display by using the first conductive polymer layer. The second anode layer structure replaces metal aluminum in the related art as an anode lead by using the silver nanowire layer with high conductivity, can effectively reduce the resistance value of the anode lead, thereby reducing the starting voltage of the OLED device and improving the service life of the OLED device.

[0024] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a top view schematic diagram of an anode layer structure according to an embodiment of the present utility model;

[0027] Figure 2 yes Figure 1 A partially enlarged cross-sectional structural diagram of the area within the dashed box.

[0028] Figure 3 yes Figure 1 Another enlarged cross-sectional view of the structure at the location indicated by the dashed box in the middle;

[0029] Figure 4 This is a schematic flowchart of a method for preparing an anode layer structure according to an embodiment of the present invention;

[0030] Figure 5 This is a top view structural diagram of a display panel according to an embodiment of the present utility model;

[0031] Figure 6 This is a schematic cross-sectional view of a display panel along the A-A' direction according to an embodiment of the present utility model;

[0032] Figure 7 This is a schematic diagram of a display device provided according to an embodiment of the present utility model. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0034] It should be noted that the terms "first", "second", and the like in the description and claims of the utility model and the above drawings are used to distinguish like objects, and are not necessarily used to describe a particular order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] The utility model embodiment provides a kind of anode layer structure. Figure 1 The utility model embodiment provides a kind of anode layer structure's overhead structure schematic diagram, Figure 2 Is Figure 1 Partial enlarged sectional structure schematic diagram in dashed line frame position.Combining Figure 1 And Figure 2 The anode layer structure 000 includes: first anode layer structure 110 and the second anode layer structure 120 around first anode layer structure 110.

[0036] First anode layer structure 110 includes first conductive polymer layer 111;Second anode layer structure 120 includes second conductive polymer layer 121, silver nanowire layer 122 and modification layer 123;Wherein, silver nanowire layer 122 is located on the surface of second conductive polymer layer 121, modification layer 123 is located on the side surface of silver nanowire layer 122 away from second conductive polymer layer 121.

[0037] Second conductive polymer layer 121 is in contact with first conductive polymer layer 111.

[0038] Specifically, anode layer structure 000 covers entire display panel, wherein, in corresponding to the middle region of display panel, anode layer structure 000 is provided with the anode of controlling each light emitting unit to emit light;In corresponding to the frame area of display panel, anode layer structure 000 is provided with the anode trace of being electrically connected with the anode of light emitting unit.Referring to Figure 1 , first anode layer structure 110 in anode layer structure 000 is arranged in middle region, and second anode layer structure 120 is arranged around a week outside first anode layer structure 110.First anode layer structure 110 as the anode of controlling each light emitting unit in display panel to emit light, and it is laminated with each light emitting unit;Second anode layer structure 120 as the auxiliary electrode of being connected with the anode of controlling each light emitting unit to emit light, i.e. anode trace, it is arranged in the frame area of avoiding light emitting unit.

[0039] Referring to Figure 2 The first anode layer structure 110 includes a first conductive polymer layer 111, i.e., the first anode layer structure 110 is a single film layer structure. Exemplarily, the first conductive polymer layer 111 includes a PEDOT:PSS film layer, which can be formed by spin coating a PEDOT:PSS aqueous solution. PEDOT:PSS is an aqueous solution of a high molecular polymer, which has a very high conductivity, and the PEDOT:PSS film layer has good flexibility. In the embodiment of the present application, the first conductive polymer layer 111 formed by the PEDOT:PSS film layer replaces ITO used in the related art as an anode for controlling the light emission of the light-emitting unit, which can effectively improve the conductivity compared with ITO, and the first conductive polymer layer 111 has good flexibility and can better meet the needs of the flexible display panel.

[0040] Continuing to refer to Figure 2 The second anode layer structure 120 includes a second conductive polymer layer 121, a silver nanowire layer 122, and a modification layer 123, which is a multi-film layer composite structure. The silver nanowire layer 122 is the main structure in the second anode layer structure 120, which replaces the metal aluminum used in the related art to form an anode trace in the frame position. The silver nanowire layer 122 can be formed by spin coating or printing a silver nanowire dispersion liquid. The silver nanowire layer 122 is an anode auxiliary electrode, which has high conductivity compared with the metal aluminum used in the related art, and can effectively reduce the resistance value of the anode trace, thereby being conducive to reducing the starting voltage of the OLED device and effectively improving the service life of the OLED device. The modification layer 123 is covered on the surface of the silver nanowire layer 122, which can effectively protect the silver nanowire layer 122 from being oxidized and maintain good conductivity. Exemplarily, the modification layer 123 includes a molybdenum trioxide film layer.

[0041] Between the second anode layer structure 120 and the first anode layer structure 110, the second conductive polymer layer 121 is arranged in contact with the first conductive polymer layer 111, so that the silver nanowire layer 122 in the second anode layer structure 120 has good electrical connection with the first conductive polymer layer 111. Exemplarily, the second conductive polymer layer 121 includes a PEDOT:PSS film layer, i.e., the second conductive polymer layer 121 and the first conductive polymer layer 111 use the same material, and therefore, the second conductive polymer layer 121 in contact with the first conductive polymer layer 111 can make the second anode layer structure 120 have good electrical contact with the first anode layer structure 110. In this way, the silver nanowire layer 122 with high conductivity can effectively reduce the starting voltage of the OLED device, thereby improving the service life of the OLED device.

[0042] It should be noted that, in the embodiment of the present application, the first anode layer structure 110, as the anode for controlling the light emission of each light emitting unit, adopts a single film layer structure, which can improve the conductivity while having good light transmittance, so as to ensure that the OLED device has high light emission efficiency; if a multi-film layer composite structure is adopted, the light transmittance will be affected, and the light emission efficiency of the OLED device will be reduced. The second anode layer structure 120, as the anode lead, adopts a multi-film layer composite structure with good conductivity, which can effectively improve the conductivity of the anode lead and improve the service life of the OLED device.

[0043] The anode layer structure provided in the embodiment of the present application, wherein the first anode layer structure for controlling the light emission of each light emitting unit comprises a first conductive polymer layer, and the second anode layer structure arranged around the first anode layer structure comprises a second conductive polymer layer, a silver nanowire layer and a modification layer. The first conductive polymer layer has good conductivity, and replaces ITO in the related art as the anode, which can improve the conductivity while not affecting the light transmittance, and the first conductive polymer layer can better adapt to the demand of flexible display. The second anode layer structure replaces metal aluminum in the related art as the anode lead by using the silver nanowire layer with high conductivity, which can effectively reduce the resistance value of the anode lead, thereby reducing the starting voltage of the OLED device and improving the service life of the OLED device.

[0044] On the basis of the above embodiments, further referring to Figure 2 Optionally, the thickness range of the first conductive polymer layer 111 and the thickness range of the second conductive polymer layer 121 both include 30-70 nm.

[0045] Exemplarily, if the thickness of the first conductive polymer layer 111 and the second conductive polymer layer 121 is less than 30 nm, the conductivity may be poor due to being too thin, and the electrical connection performance between the second conductive polymer layer 121 and the first conductive polymer layer 111 is poor; if the thickness of the first conductive polymer layer 111 and the second conductive polymer layer 121 is greater than 70 nm, the light transmittance of the first conductive polymer layer 111 as the anode may be poor due to being too thick, which will affect the light emission efficiency of the OLED device; and the material cost of the OLED device will be increased due to being too thick. Preferably, the thickness of the first conductive polymer layer 111 and the second conductive polymer layer 121 is 50 nm, so that the first conductive polymer layer 111 has good conductivity while having good light transmittance, and the light emission efficiency of the OLED device is not affected.

[0046] On the basis of the above embodiments, further referring to Figure 2 The thickness range of the silver nanowire layer 122 includes 20-50 nm, and the thickness range of the modification layer 123 includes 3-7 nm.

[0047] Exemplarily, if the thickness of the silver nanowire layer 122 is less than 20 nm, the conductivity can be affected due to the too thin thickness, so that the resistance of the anode lead is increased, resulting in the increase of the initial voltage of the OLED device, and further affecting the service life of the OLED device. If the thickness of the silver nanowire layer 122 is greater than 50 nm, unnecessary material loss can be caused, and the material cost is increased. Preferably, the thickness of the silver nanowire layer 122 is 30 nm.

[0048] Exemplarily, if the thickness of the modification layer 123 is less than 3 nm, the effect of protecting the silver nanowire layer 122 from being oxidized can be affected, and further the conductivity of the silver nanowire layer 122 can be affected, and the resistance value of the anode lead is increased. If the thickness of the modification layer 123 is greater than 7 nm, unnecessary material loss can be increased, and the material cost is increased. Preferably, the thickness of the modification layer 123 is 5 nm.

[0049] On the basis of the above embodiments, further referring to Figure 2 Optionally, the orthographic projection of the silver nanowire layer 122 on a horizontal plane completely overlaps with the orthographic projection of the modification layer 123 on the horizontal plane; and the orthographic projection of the second conductive polymer layer 121 on the horizontal plane at least partially overlaps with the orthographic projection of the silver nanowire layer 122 on the horizontal plane.

[0050] Specifically, the orthographic projection of the modification layer 123 on a horizontal plane completely overlaps with the orthographic projection of the silver nanowire layer 122 on the horizontal plane, so that the modification layer 123 completely covers the surface of the silver nanowire layer 122, and the silver nanowire layer 122 is protected from contacting the external air, so that the silver nanowire layer 122 is protected from being oxidized and has high conductivity. The orthographic projection of the second conductive polymer layer 121 on the horizontal plane can fully overlap with the orthographic projection of the silver nanowire layer 122 on the horizontal plane, i.e., completely overlap; or can partially overlap. Exemplarily, Figure 3 The orthographic projection of the second conductive polymer layer 121 on a horizontal plane fully overlaps with the orthographic projection of the silver nanowire layer 122 on the horizontal plane, i.e., the second conductive polymer layer 121 is arranged on the side of the silver nanowire layer 122 away from the modification layer 123, and the second conductive polymer layer 121 is in contact with the first conductive polymer layer 111. Alternatively, the second conductive polymer layer 121 can be arranged in a non-entire layer, i.e., the area of the second conductive polymer layer 121 is smaller than the area of the silver nanowire layer 122, and the second conductive polymer layer 121 is in contact with the first conductive polymer layer 111. In this way, the silver nanowire layer 122 as the auxiliary electrode has good electrical contact with the first conductive polymer layer 111, so that the resistance value of the anode lead is reduced, and the service life of the OLED device is improved.

[0051] On the basis of the above embodiments, Figure 1 is Figure 3 Another partial enlarged sectional structure schematic view of the position of the dashed box in FIG. 11. Referring toFigure 3 Optionally, the first conductive polymer layer 111 comprises a first conductive part 112 and a second conductive part 113.

[0052] The second conductive part 113 is arranged protruding from the edge of the first conductive part 112, and the second conductive part 113 partially overlaps the silver nanowire layer 122.

[0053] Specifically, the first conductive polymer layer 111 comprises the first conductive part 112 arranged in the central region, and the second conductive part 113 arranged protruding from the edge of the first conductive part 112. The second conductive part 113 is in an integrated structure with the first conductive part 112, and the second conductive part 113 is arranged protruding from the left and right side edges of the first conductive part 112. The second conductive part 113 serves as a medium for realizing good electrical connection between the silver nanowire layer 122 and the first conductive part 112, the second conductive part 113 overlaps the silver nanowire layer 122, and the overlapping area between the silver nanowire layer 122 and the second conductive part 113 is not too small to ensure good contact between the silver nanowire layer 122 and the second conductive part 113. For the structure of the first conductive polymer layer 111 provided in the embodiment, the second conductive part 113 plays a role equivalent to that of the second conductive polymer layer 121, and therefore, in the embodiment, the second conductive part 113 is reused as the second conductive polymer layer 121 in the second anode layer structure 120, and therefore Figure 4 The second conductive polymer layer 121 is not labeled in the figure. In addition, the second conductive part 113 is arranged to partially overlap the silver nanowire layer 122, which can reduce the material cost while ensuring good contact.

[0054] The embodiment of the utility model also provides a preparation method of an anode layer structure. Figure 4 It is a flow chart of the preparation method of the anode layer structure provided by the embodiment of the utility model. Referring to Figure 5 The preparation method of the anode layer structure specifically comprises the following steps:

[0055] S1, spin-coat PEDOT:PSS solution on the central region and the edge region of the provided substrate surface to form a first conductive polymer layer and a second conductive polymer layer;

[0056] S2, spin-coat or print silver nanowire dispersion on the edge region of the provided substrate surface on the side of the second conductive polymer layer away from the substrate to form a silver nanowire layer;

[0057] S3, in the edge region of the provided substrate surface, a modification layer is formed on the side of the silver nanowire layer away from the second conductive polymer layer by vacuum evaporation.

[0058] The preparation method of the anode layer structure provided in the embodiment of the utility model can prepare the anode layer structure provided in any embodiment of the utility model, and the effect is similar to that of the prepared anode layer structure, which will not be repeated here.

[0059] The utility model embodiment further provides a display panel. Figure 6 It is a display panel's overhead structure schematic diagram provided in the utility model embodiment, Figure 5 It is a display panel's section structure schematic diagram along A-A direction provided in the utility model embodiment.Referring to Figure 6 And Figure 7 The display panel 00 includes a display area AA and a non-display area NA surrounding the display area AA.

[0060] The display panel 00 further includes an array substrate 100, a light emitting layer 200, a cathode layer 300 and the anode layer structure 000 provided in any embodiment as described above.

[0061] The anode layer structure 000 is located on the surface of the array substrate 100, the light emitting layer 200 is located on the side of the anode layer structure 000 away from the array substrate 100, and the cathode layer 300 is located on the side of the light emitting layer 200 away from the anode layer structure 000; the first anode layer structure 110 of the anode layer structure 000 is located in the display area AA, and the second anode layer structure 120 is located in the non-display area NA.

[0062] Specifically, the first anode layer structure 110 is arranged in the display area AA of the display panel 00, and the array substrate 100, the first anode layer structure 110, the light emitting layer 200 and the cathode layer 300 are sequentially stacked. The second anode layer structure 120 is arranged in the non-display area NA of the display panel 00, the second anode layer structure 120 serves as an auxiliary electrode of the first anode layer structure 110 located in the display area AA, and the second anode layer structure 120 is arranged in contact with the first anode layer structure 110, so that the two have good electrical contact to control the normal light emission of the light emitting layer 200 in the display area AA. The display panel 00 provided in the embodiment of the utility model has the anode layer structure 000 provided in any embodiment as described above, and the technical principle and the effect are similar to those of the anode layer structure 000, which will not be repeated here.

[0063] The utility model embodiment further provides a display device. Figure 7 It is a display device provided in the utility model embodiment. As shown in ​ The display device can be a mobile phone, a tablet computer and the like. The display device includes the display panel provided in the embodiment of the utility model, and the technical principle and the effect are similar, which will not be repeated here.

[0064] The specific embodiments described above do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An anode layer structure, characterized by Comprising: a first anode layer structure and a second anode layer structure surrounding the first anode layer structure; the first anode layer structure comprises a first conductive polymer layer; the second anode layer structure comprises a second conductive polymer layer, a silver nanowire layer and a modification layer; wherein the silver nanowire layer is located on the surface of the second conductive polymer layer, and the modification layer is located on the surface of the side of the silver nanowire layer away from the second conductive polymer layer; the second conductive polymer layer is in contact with the first conductive polymer layer.

2. The anode layer structure according to claim 1, characterized in that The first conductive polymer layer and the second conductive polymer layer comprise a PEDOT:PSS film layer.

3. The anode layer structure according to claim 1, characterized in that The modification layer comprises a molybdenum trioxide film layer.

4. The anode layer structure according to claim 2, characterized in that The thickness range of the first conductive polymer layer and the thickness range of the second conductive polymer layer both include 30-70nm.

5. The anode layer structure according to claim 1, characterized in that The thickness range of the silver nanowire layer includes 20-50nm.

6. The anode layer structure according to claim 3, characterized in that The thickness range of the modification layer includes 3-7nm.

7. The anode layer structure according to claim 1, wherein: the horizontal projection of the silver nanowire layer completely coincides with the horizontal projection of the modification layer; the horizontal projection of the second conductive polymer layer at least partially overlaps with the horizontal projection of the silver nanowire layer.

8. The anode layer structure according to claim 7, characterized in that The first conductive polymer layer comprises a first conductive part and a second conductive part; The second conductive part is arranged protruding from the edge of the first conductive part, and the second conductive part partially overlaps with the silver nanowire layer.

9. A display panel, characterized by, Comprising: a display area and a non-display area surrounding the display area; The display panel further comprises an array substrate, a light-emitting layer, a cathode layer and an anode layer structure according to any one of claims 1-8; The anode layer structure is located on the surface of the array substrate, the light-emitting layer is located on the side of the anode layer structure away from the array substrate, and the cathode layer is located on the side of the light-emitting layer away from the anode layer structure; The first anode layer structure of the anode layer structure is located in the display area, and the second anode layer structure is located in the non-display area.

10. A display device, characterized by comprising: The display panel according to claim 9 is included.

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