Display panel and display device

Abstract

The invention relates to a display panel and a display device, and relates to the technical field of display. The display panel comprises a display area, an edge area and a fan-out area, the edge area surrounds the display area, and the fan-out area is connected to the side, away from the display area, of the edge area; the fan-out area comprises a bending area and a binding area which extend in the row direction. The display panel comprises a driving backboard which is provided with a power bus, and the power bus extends to a fan-out area from an edge area; the power bus comprises a fan-out section which extends along the column direction and passes through the bending area to be connected with the binding area; at least one side edge of the fan-out section is provided with a plurality of extension fingers which are distributed at intervals along the column direction; convex teeth are arranged on the side edges of the extension fingers; the lengths of at least part of the extension fingers are different; the light-emitting device is arranged on one side of the driving backboard and located in the display area; an encapsulation layer covering the light emitting device; the boundary of the packaging layer extends to the fan-out area and is located on the side, close to the display area, of the bending area. At least part of the extension fingers are located within the boundary of the encapsulation layer.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] In a display panel using organic light emitting diodes as light emitting devices, the organic materials of the light emitting devices are easily corroded by water vapor, oxygen, etc., resulting in poor display or even scrap. Therefore, the packaging effect of the light emitting devices is directly related to the display effect and life of the display panel. However, the barrier effect of existing display panels against water vapor, oxygen, etc. still needs to be improved.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The purpose of the present disclosure is to overcome the above-mentioned deficiencies of the prior art and provide a display panel and a display device, which can improve the packaging effect.

[0005] According to one aspect of the present disclosure, a display panel is provided, comprising a display area, an edge area and a fan-out area, wherein the edge area surrounds the display area, and the fan-out area is connected to a side of the edge area away from the display area along a column direction; the fan-out area comprises a bending area extending along a row direction and a binding area located on a side of the bending area away from the display area;

[0006] The display panel comprises:

[0007] A driving backplane, comprising a power bus, the power bus extending from the edge area to the fan-out area; the power bus comprising a fan-out section extending along the column direction and connected to the binding area through the bending area; at least one side of the fan-out section is provided with a plurality of extension fingers spaced apart along the column direction; the side of the extension finger has convex teeth; at least some of the extension fingers have different lengths;

[0008] A light emitting device, arranged on one side of the driving backplane and located in the display area;

[0009] A packaging layer covers the light-emitting device; a boundary of the packaging layer extends to the fan-out area and is located on a side of the bending area close to the display area; at least part of the extension finger is located within the boundary of the packaging layer.

[0010] In an exemplary embodiment of the present disclosure, any two adjacent extending fingers have different lengths.

[0011] In an exemplary embodiment of the present disclosure, each of the extending fingers includes a first sub-extending finger and a plurality of second sub-extending fingers, the first sub-extending finger is longer than the second sub-extending finger, and the second sub-extending fingers are distributed on both sides of the first sub-extending finger.

[0012] In an exemplary embodiment of the present disclosure, at least two of the extending fingers have different numbers of protruding teeth.

[0013] In an exemplary embodiment of the present disclosure, the length of the extension finger is positively correlated with the number of protruding teeth thereon.

[0014] In an exemplary embodiment of the present disclosure, each of the extended fingers on the same side of the same fan-out segment includes a plurality of first sub-extended fingers and second sub-extended fingers alternately distributed along the column direction, the length of each of the first sub-extended fingers is the same, the length of each of the second sub-extended fingers is the same; the length of the first sub-extended finger is greater than that of the second sub-extended finger; the absolute value of the length difference between the first sub-extended finger and the second sub-extended finger is greater than 3 times the width of the convex tooth in the row direction.

[0015] In an exemplary embodiment of the present disclosure, both side edges of the extending finger are provided with convex teeth, and the convex teeth on both side edges are symmetrically arranged.

[0016] In an exemplary embodiment of the present disclosure, the convex teeth belonging to adjacent two side edges of two adjacent extending fingers are staggered.

[0017] In an exemplary embodiment of the present disclosure, a distance between two adjacent extending fingers is greater than a width of the extending fingers.

[0018] In an exemplary embodiment of the present disclosure, the distance between two adjacent extending fingers is greater than or equal to twice the width of the extending fingers.

[0019] In an exemplary embodiment of the present disclosure, at least a portion of the extended fingers are located outside a boundary of the encapsulation layer.

[0020] In an exemplary embodiment of the present disclosure, the orthographic projection of the convex tooth and the side edge of the extending finger where the convex tooth is located on the driving back plate is a smooth curve.

[0021] In an exemplary embodiment of the present disclosure, a height of the protruding teeth is smaller than a width of a region where the protruding teeth are not provided.

[0022] In an exemplary embodiment of the present disclosure, the number of the power buses is multiple, and includes a first power bus and a second power bus; the fan-out segment of the first power bus is a first fan-out segment, and the extension finger of the first fan-out segment is a first extension finger; the fan-out segment of the second power bus is a second fan-out segment, and the extension finger of the second fan-out segment is a second extension finger;

[0023] The driving backplane has a plurality of pixel circuits and power lines, at least part of the pixel circuits are located in the display area; the light emitting device comprises a first electrode, a light emitting layer and a second electrode stacked in a direction away from the driving backplane;

[0024] Each of the power lines extends along the column direction and is connected to the second power bus; the second electrode is connected to the first power bus;

[0025] At least a portion of the second extending fingers is located on a side of the first extending fingers close to the display area.

[0026] In an exemplary embodiment of the present disclosure, the number of the first fan-out segments is two; the second fan-out segment is located between the two first fan-out segments;

[0027] The number of the first extending fingers is greater than the number of the second extending fingers.

[0028] In an exemplary embodiment of the present disclosure, the driving backplane includes a substrate and a semiconductor layer, a first gate layer, a second gate layer and at least one source-drain layer distributed in a direction away from the substrate; at least a portion of the fan-out segment and its extension finger are located in at least one of the source-drain layers;

[0029] The source-drain layer includes a first protective conductive layer, a main conductive layer, and a second protective conductive layer which are sequentially stacked in a direction away from the substrate.

[0030] In an exemplary embodiment of the present disclosure, a portion of the fan-out segment located between the fan-out area and the display area includes a plurality of stacked conductive portions, one of the conductive portions is located in the source / drain layer; and a side edge of at least one of the conductive portions has the convex teeth.

[0031] In an exemplary embodiment of the present disclosure, each of the conductive parts of the same fan-out segment has the convex teeth, and the convex teeth of any two conductive parts are overlapped and arranged in a one-to-one correspondence.

[0032] In an exemplary embodiment of the present disclosure, each of the conductive parts of the same fan-out segment has the convex teeth, and the convex teeth of any two of the conductive parts are staggered.

[0033] According to one aspect of the present disclosure, a display panel is provided, comprising a display area, an edge area and a fan-out area, wherein the edge area surrounds the display area, and the fan-out area is connected to a side of the edge area away from the display area along a column direction; the fan-out area comprises a bending area extending along a row direction and a binding area located on a side of the bending area away from the display area;

[0034] The display panel comprises:

[0035] A driving backplane, comprising a power bus, the power bus extending from the edge area to the fan-out area; the power bus comprising a fan-out section extending along the column direction and connected to the binding area through the bending area; at least one side of the fan-out section is provided with a plurality of extension fingers spaced apart along the column direction; the side of the extension finger has convex teeth; at least some of the extension fingers have different lengths, and the length of the extension finger is positively correlated with the number of convex teeth thereon;

[0036] A light emitting device, arranged on one side of the driving backplane and located in the display area;

[0037] A packaging layer covers the light-emitting device; a boundary of the packaging layer extends to the fan-out area and is located on a side of the bending area close to the display area; at least part of the extension finger is located within the boundary of the packaging layer.

[0038] According to one aspect of the present disclosure, a display device is provided, comprising any one of the display panels described above.

[0039] The display panel and display device disclosed in the present invention can realize the transmission of electrical signals through the power bus, because the power bus extends from the edge area to the fan-out area, and its fan-out section is connected to the binding area through the bending area. The encapsulation layer can block external water vapor and oxygen, but water vapor and oxygen will still enter the range covered by the encapsulation layer, and can erode the display area along the side of the fan-out section. The extension finger can increase the length of the side of the fan-out section, extend the erosion path of water vapor and oxygen, prevent them from eroding the light-emitting devices in the display area, ensure the display effect, and extend the product life. At the same time, the convex teeth on the side of the extension finger can further extend the length of the side of the extension finger, and further extend the erosion path. In addition, the lengths of at least some of the extension fingers are different, that is, the lengths of the extension fingers are uneven, which can reduce the risk of water vapor and oxygen directly eroding the display area along the distribution direction of each extension finger.

[0040] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0042] Figure 1 FIG. 1 is a top view of an embodiment of a display panel disclosed herein.

[0043] Figure 2 FIG. 1 is a schematic diagram of the distribution of wiring in an embodiment of a display panel disclosed herein.

[0044] Figure 3 FIG. 1 is a partial cross-sectional schematic diagram of a display area in an embodiment of a display panel disclosed herein.

[0045] Figure 4 FIG. 1 is a partial cross-sectional schematic diagram of a peripheral area of ​​a display panel in an embodiment of the present disclosure.

[0046] Figure 5 It is a partial cross-sectional schematic diagram of the source and drain layer in one embodiment of the display panel disclosed in the present invention.

[0047] Figure 6 FIG. 1 is a partial top view of a peripheral area of ​​a display panel in an embodiment of the present disclosure.

[0048] Figure 7 for Figure 6 A partial view of the .

[0049] Figure 8 It is a partial enlarged view of the first power bus in one embodiment of the display panel disclosed in the present invention.

[0050] Fig. 9 It is a partial enlarged view of the first power bus in another embodiment of the display panel disclosed in the present invention.

[0051] Fig.10 This is a partial enlarged view of the first power bus in yet another embodiment of the display panel disclosed herein.

[0052] Fig.11 It is a partial enlarged view of the first power bus in one embodiment of the display panel disclosed in the present invention.

[0053] Fig.12 It is a partial enlarged view of the first power bus in one embodiment of the display panel disclosed in the present invention. DETAILED DESCRIPTION

[0054] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0055] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0056] The row direction X and the column direction Y in this article are merely two mutually perpendicular directions. In the drawings of the present disclosure, the row direction X may be horizontal and the column direction Y may be vertical, but this is not limited thereto. If the display panel is rotated, the actual directions of the row direction X and the column direction Y may change.

[0057] The present disclosure provides a display panel. Figure 1 As shown, the display panel may include a display area AA, an edge area EA and a fan-out area FA, wherein the edge area EA surrounds the display area AA, and the fan-out area FA is connected to a side of the edge area EA away from the display area AA along a column direction Y; the fan-out area FA includes a bending area BA extending along a row direction X and a binding area PA located on a side of the bending area BA away from the display area AA.

[0058] like Figure 2-Figure 4 As shown, the display panel includes a driving backplane BP, a light emitting device LD and an encapsulation layer TFE, wherein:

[0059] The driving backplane BP has a power bus, which extends from the edge area EA to the fan-out area FA; the power bus includes a fan-out section extending along the column direction Y and connected to the binding area PA through the bending area BA; at least one side of the fan-out section is provided with a plurality of extension fingers DF distributed at intervals along the column direction Y; the side of the extension finger DF has convex teeth DFs; at least some of the extension fingers DF have different lengths;

[0060] The light emitting device LD is arranged on one side of the driving back plate BP and is located in the display area AA;

[0061] The encapsulation layer TFE covers the light emitting device LD; the boundary of the encapsulation layer TFE extends to the fan-out area FA and is located on the side of the bending area BA close to the display area AA; at least part of the extension finger DF is located within the boundary of the encapsulation layer TFE.

[0062] The display panel of the embodiment of the present disclosure can realize the transmission of electrical signals through the power bus, because the power bus extends from the edge area EA to the fan-out area FA, and its fan-out section is connected to the binding area PA through the bending area BA. The encapsulation layer TFE can block external water vapor and oxygen, but water vapor and oxygen will still enter the range covered by the encapsulation layer TFE, and can erode the display area AA along the side of the fan-out section. The extension finger DF can increase the length of the side of the fan-out section, extend the erosion path of water vapor and oxygen, and prevent them from eroding the light-emitting device LD of the display area AA, thereby ensuring the display effect and extending the product life. At the same time, the convex teeth DFs on the side of the extension finger DF can further extend the side length of the extension finger DF and further extend the erosion path. In addition, the lengths of at least some of the extension fingers DF are different, that is, the lengths of the extension fingers DF are uneven, which can reduce the risk of water vapor and oxygen directly eroding the display area AA along the distribution direction of each extension finger DF.

[0063] The display panel of the present disclosure is described in detail below:

[0064] like Figure 1 and Figure 2 As shown, the display panel has a display area AA and a peripheral area outside the display area AA. The peripheral area may be a continuous or discontinuous annular area surrounding the display area AA, or may be a semi-enclosed area. The shape of the peripheral area is not particularly limited herein. The peripheral area may include an edge area EA surrounding the display area AA and a fan-out area FA connected to a side of the edge area EA away from the display area AA along a column direction Y.

[0065] The fan-out area FA may include a bending area BA and a binding area PA distributed along the column direction Y, and the binding area PA is located on the side of the bending area BA away from the display area AA. By bending the bending area BA, the fan-out area FA can be bent to the backlight side of the display panel, that is, the side opposite to the light emitting direction. The binding area PA has at least one driver chip and a plurality of pins connected to the driver chip, which can be connected to a flexible circuit board through the pins of the binding area PA, and the flexible circuit board can be bound to a control circuit board, so as to realize the connection between the display panel and the control circuit board, so as to control the display panel to display an image through the control circuit board. Of course, the binding area PA may also not be provided with a driver chip, but the driver chip can be set on the flexible circuit board or the control circuit board, and connected to the pins of the binding area PA, so as to realize display.

[0066] like Figure 3 and Figure 4As shown, the display panel may include a driving backplane BP, a light emitting device LD and an encapsulation layer TFE, the light emitting device LD may be arranged on one side of the driving backplane BP, and the encapsulation layer TFE covers each light emitting device LD, wherein:

[0067] The driving backplane BP may include a driving circuit for driving each light-emitting device LD to emit light independently. The driving circuit may include a pixel circuit and a peripheral circuit, wherein the number of pixel circuits is multiple, and at least part of the pixel circuits are arranged in the display area AA. Of course, part of the pixel circuit may be located in the peripheral area.

[0068] Each pixel circuit may include multiple transistors and storage capacitors. The pixel circuit may be a 3T1C, 7T1C, or other pixel circuits. nTmC indicates that a pixel circuit includes n transistors (indicated by the letter "T") and m capacitors (indicated by the letter "C"). There may be multiple pixel circuits, and the array may be arranged in multiple rows and columns. One pixel circuit may be connected to one light emitting device LD. Of course, one pixel circuit may be connected to multiple light emitting devices LD.

[0069] The peripheral circuit of the driving backplane BP may include a gate driving circuit, a light emitting control circuit and other circuits for scanning pixel circuits, wherein the gate driving circuit may include a plurality of gate shift register units cascaded in the column direction Y, and one gate shift register unit may scan at least one row of pixel circuits. At the same time, the light emitting control circuit also includes a plurality of light emitting shift register units cascaded in the column direction Y, and one light emitting shift register unit may scan at least one row of pixel circuits. The gate driving circuit is located between the light emitting control circuit and the display area AA. At the same time, the gate driving circuit and the light emitting control circuit may be connected to the binding area PA through a driving line.

[0070] The peripheral circuit also includes multiple power buses located in the peripheral area, each power bus can extend from the edge area EA to the fan-out area FA, and extend through the bending area BA to the binding area PA, wherein the power bus may include a fan-out segment extending along the column direction Y and connected to the binding area PA through the bending area BA.

[0071] like Figure 2As shown, in some embodiments of the present disclosure, the power bus includes a first power bus VSB and a second power bus VDB, the fan-out segment of the first power bus VSB is the first fan-out segment VSB1, the fan-out segment of the second power bus VDB is the second fan-out segment VDB1, and the first fan-out segment VSB1 and the second fan-out segment VDB1 may be distributed alternately along the row direction X. Further, the first power bus VSB may include a first connecting segment VSB2 located in the edge area EA and surrounding the display area AA, and two first fan-out segments VSB1 extending from the edge area EA to the fan-out area FA, and the two first fan-out segments VSB1 may be distributed along the row direction X. At the same time, the second power bus VDB may include a second connecting segment VDB2 in the edge area EA extending along the row direction X and located between the bending area BA and the display area AA, and one or two second fan-out segments VDB1 extending from the edge area EA to the fan-out area FA, and the first connecting segment VSB2 is located outside the second connecting segment VDB2, that is, on the side away from the display area AA, and the second fan-out segment VDB1 is located between the two first fan-out segments VSB1. The driving wiring may be located at a side of the first power bus VSB away from the display area AA, that is, located outside the first power bus VSB.

[0072] like Figure 2 As shown, the driving backplane BP may include a power line VDL extending along the column direction Y, which may pass through the display area AA, and a column of pixel circuits may be connected to a power line VDL, so that the power line VDL and the light-emitting device LD may be connected through the pixel circuit. At the same time, the second electrode CAT of each light-emitting device LD may be a continuous whole-layer structure, and may be connected to the first connection segment VSB2 of the first power bus VSB, and the first power signal may be transmitted to the light-emitting device LD through the first power bus VSB; each power line VDL may be connected to the second connection segment VDB2 of the second power bus VDB, so that the second power bus VDB may be connected to the first electrode ANO of the light-emitting device LD through the power line VDL and the pixel circuit, thereby transmitting the second power signal.

[0073] In addition, the driving backplane BP may also include a plurality of data lines distributed along the row direction X. A data line may be connected to at least one column of pixel circuits for transmitting a data signal for controlling the brightness of the light-emitting device LD to the pixel circuits. The data line may pass through the display area AA along the column direction, and after passing through the edge area EA and the bending area BA, it may be connected to the binding area PA.

[0074] The following is an exemplary description of each film layer of the driving backplane BP:

[0075] like Figure 3 and Figure 4As shown, the driving backplane BP may include a substrate SU and a semiconductor layer SE, a first gate layer GA1, a second gate layer GA2 and at least one source-drain layer distributed in a direction away from the substrate SU. The active portion of the transistor of the pixel circuit may be located in the semiconductor layer SE, the gate of the transistor may be located in the first gate layer GA1, and the two plates of the capacitor may be located in the first gate layer GA1 and the second gate layer GA2, respectively. The pattern of the source-drain layer may realize the connection of at least part of the transistor and the capacitor. At the same time, the power line VDL may be located in at least one source-drain layer, and at least part of the power bus may be located in at least one source-drain layer. Accordingly, at least part of its fan-out section and its extension finger DF may be located in at least one source-drain layer.

[0076] In addition, the driving backplane BP may further include a first gate insulating layer GI1, a second gate insulating layer GI2 and an interlayer dielectric layer ILD, wherein the first gate insulating layer GI1 may cover the semiconductor layer SE, and the first gate layer GA1 may be arranged on the surface of the first gate insulating layer GI1 away from the substrate SU. The second gate insulating layer GI2 covers the first gate layer GA1, and the second gate layer GA2 is arranged on the surface of the second gate insulating layer GI2 away from the substrate SU. The interlayer dielectric layer ILD covers the second gate layer GA2, and each source and drain layer may be arranged on the side of the interlayer dielectric layer ILD away from the substrate SU.

[0077] like Figure 3 As shown, in some embodiments of the present disclosure, the number of source and drain layers is two, and includes a first source and drain layer SD1 and a second source and drain layer SD2. The driving backplane BP also includes a first flat layer PLN1 and a second flat layer PLN2, wherein the first source and drain layer SD1 can be arranged on the surface of the interlayer dielectric layer ILD away from the substrate SU. The first flat layer PLN1 covers the first source and drain layer SD1. Of course, the first source and drain layer SD1 can also be covered with a passivation layer, and then the passivation layer is covered with the first flat layer PLN1. The second source and drain layer SD2 is arranged on the surface of the first flat layer PLN1 away from the substrate SU, and the second flat layer PLN2 covers the second source and drain layer SD2. The first electrode ANO of the light-emitting device LD is arranged on the surface of the second flat layer PLN2 away from the substrate SU.

[0078] In some embodiments of the present disclosure, the number of source and drain layers is one, and the driving backplane BP may further include a planar layer, wherein the source and drain layers may be disposed on a surface of the interlayer dielectric layer ILD away from the substrate SU. The planar layer covers the source and drain layers. The first electrode ANO of the light emitting device LD is disposed on a surface of the planar layer away from the substrate SU.

[0079] The number of source and drain layers is three, and includes a first source and drain layer SD1, a second source and drain layer SD2, and a third source and drain layer. The driving backplane BP also includes a first flat layer PLN1, a second flat layer PLN2, and a third flat layer, wherein the first source and drain layer SD1 can be arranged on the surface of the interlayer dielectric layer ILD away from the substrate SU. The first flat layer PLN1 covers the first source and drain layer SD1. Of course, the first source and drain layer SD1 can also be covered with a passivation layer, and then the passivation layer is covered with the first flat layer PLN1. The second source and drain layer SD2 is arranged on the surface of the first flat layer PLN1 away from the substrate SU, and the second flat layer PLN2 covers the second source and drain layer SD2. The third source and drain layer is arranged on the surface of the second flat layer PLN2 away from the substrate SU, and the third flat layer covers the second source and drain layer SD2. The first electrode ANO of the light-emitting device LD is arranged on the surface of the third flat layer away from the substrate SU.

[0080] The source and drain layers can be single-layer or multi-layer structures, such as Figure 5 As shown, in some embodiments of the present disclosure, the source-drain layer SD may include a first protective conductive layer S1, a main conductive layer S2, and a second protective conductive layer S3 stacked in sequence in a direction away from the substrate SU, the first protective conductive layer S1 and the second protective conductive layer S3 are thinner than the main conductive layer S2, and have a lower conductivity than the main conductive layer S2, and have good anti-oxidation properties, thereby improving the lifespan while conducting electricity, and the main conductive layer S2 can be used to reduce resistance and improve conductivity. When the pattern of the source-drain layer is formed by an etching process, the etching rate of the first protective conductive layer S1 and the second protective conductive layer S3 is less than the etching rate of the main conductive layer S2, so that the side wall of the main conductive layer S2 is concave relative to the side wall of the first protective conductive layer S1 and the second protective conductive layer S3, forming a channel CH. For example, the first protective conductive layer S1 and the second protective conductive layer S3 may be made of metal titanium, and the main conductive layer S2 may be made of metal aluminum, that is, a Ti / Al / Ti structure; or, the first protective conductive layer S1 and the second protective conductive layer S3 may also be made of other conductive materials such as metal oxides, and the main conductive layer S2 may also be made of other metals such as metal silver.

[0081] At least a portion of the power line VDL may be located in at least one source-drain layer, and at least a portion of the power bus may be located in at least one source-drain layer. Furthermore, the portion of the fan-out segment located in the bending area BA and the display area AA may be a single-layer or multi-layer structure. If it is a single-layer structure, it may be located in any source-drain layer; if it is a multi-layer structure, it may be located in multiple source-drain layers. For example, the portion of the fan-out segment located between the fan-out area FA and the display area AA may include multiple stacked conductive portions VP, and one conductive portion VP is located in a source-drain layer. If the source-drain layer may include a first source-drain layer SD1 and a second source-drain layer SD2, the conductive portion VP has two layers, and the two layers are located in the first source-drain layer SD1 and the second source-drain layer SD2, respectively.

[0082] like Figure 3 As shown, the light emitting device LD may be an OLED (organic light emitting diode), a QLED (quantum dot light emitting diode), a Micro LED or a Mini LED, etc., which may include a second electrode CAT, a second electrode CAT and a light emitting layer EL located between the second electrode CAT and the second electrode CAT, wherein:

[0083] The light-emitting layer EL may include a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer and an electron injection layer stacked in a direction away from the driving backplane BP. Each light-emitting device LD may share the second electrode CAT, that is, the second electrode CAT may be a continuous whole-layer structure, and the second electrode CAT may extend to the edge area EA, and may be connected to the first connection segment VSB2 of the first power bus VSB to receive the first power signal, and the first electrode ANO is distributed in an array to ensure that each light-emitting device LD can emit light independently. In addition, in order to limit the light-emitting range of the light-emitting device LD and prevent crosstalk, a pixel definition layer PDL may be provided on the surface where the first electrode ANO is provided, and the pixel definition layer PDL may be provided with an opening exposing each first electrode ANO, and the light-emitting layer EL is stacked with the first electrode ANO in the opening.

[0084] like Figure 3 As shown, the encapsulation layer TFE can cover the light emitting device LD, and is used to protect the light emitting device LD and prevent the light emitting device LD from being corroded by external water vapor, oxygen, etc.

[0085] like Figure 3 and Figure 4 As shown, in some embodiments of the present disclosure, the encapsulation layer TFE can be encapsulated by thin film encapsulation, which may include a first inorganic layer CVD1, an organic layer IJP and a second inorganic layer CVD2, wherein:

[0086] The first inorganic layer CVD1 covers the light emitting device LD, that is, the first inorganic layer CVD1 can be stacked on the surface of the second electrode CAT away from the driving backplane BP. The first inorganic layer CVD1 can be made of inorganic materials such as silicon nitride and silicon oxide that can block water vapor and oxygen.

[0087] The organic layer IJP can be disposed on the surface of the first inorganic layer CVD1 away from the driving backplane BP, and the boundary of the organic layer IJP is limited to the inner side of the boundary of the first inorganic layer CVD1, and the boundary of the orthographic projection of the organic layer IJP on the driving backplane BP can be located in the peripheral area to ensure that the organic layer IJP can cover each light-emitting device LD. The organic layer IJP can be made of organic materials such as resin, and its fluidity can be used to achieve flatness.

[0088] The second inorganic layer CVD2 can cover the organic layer IJP and the first inorganic layer CVD1 not covered by the organic layer IJP, thereby encapsulating the organic layer IJP. The material of the second inorganic layer CVD2 can be the same as that of the first inorganic layer CVD1, or inorganic materials such as silicon nitride and silicon oxide that can block water vapor and oxygen can be used, so that the second inorganic layer CVD2 can block the intrusion of water and oxygen. The orthographic projections of the boundaries of the first inorganic layer CVD1 and the second inorganic layer CVD2 on the driving backplane BP can overlap.

[0089] In addition, in order to limit the range of the inorganic layer, a ring-shaped barrier dam surrounding the display area AA may be provided in the edge area EA, which may be provided on the driving backplane BP and may be formed simultaneously with the process of the flat layer, the pixel definition layer PDL and other film layers. For example, the number of barrier dams is two, namely, the first barrier dam Dam1 and the second barrier dam Dam2 surrounding the first barrier dam Dam1. The second barrier dam Dam2 is higher than the first barrier dam Dam1, and both may be located in the edge area EA.

[0090] The first inorganic layer CVD1 covers the first barrier dam Dam1 and the second barrier dam Dam2 and protrudes at the first barrier dam Dam1 and the second barrier dam Dam2 , and the organic layer IJP is confined within the range surrounded by the first barrier dam Dam1 , that is, within the range surrounded by the protrusion.

[0091] Further, such as Figure 4 , Figure 6 and Figure 7 As shown, the encapsulation layer TFE can cover the display area AA and extend to the edge area EA and the fan-out area, and the boundary of the encapsulation layer TFE is located between the bending area BA and the display area AA to avoid affecting the bending of the bending area BA. For example, the boundary TL between the first inorganic layer CVD1 and the second inorganic layer CVD2 is located between the bending area BA and the display area AA.

[0092] The inventors found that the encapsulation layer TFE does not completely cover the entire area of ​​the driving backplane BP, and water vapor and oxygen can enter the encapsulation layer TFE and can erode the display area AA along the fan-out section. Among them, for the source and drain layer of the above-mentioned multi-layer structure, the etching rate of the first protective conductive layer S1 and the second protective conductive layer S3 is lower than the etching rate of the main conductive layer S2, so that the side wall of the main conductive layer S2 is concave relative to the side wall of the first protective conductive layer S1 and the second protective conductive layer S3, and the concave area is difficult to be completely filled by the flat layer and the encapsulation layer TFE, so that the channel CH for water vapor and oxygen to invade the display area AA is formed in the encapsulation layer TFE, and even in the area covered by the encapsulation layer TFE, water vapor and oxygen may invade the display area AA.

[0093] In order to solve the above problems, the invasion path can be extended to increase the invasion difficulty, thereby ensuring the packaging effect and extending the life of the light-emitting device LD. Specifically, at least one side of the fan-out segment has a plurality of extended fingers DF spaced along the column direction Y, and at least a portion of the extended fingers DF is located within the range covered by the encapsulation layer TFE, that is, the orthographic projection of at least a portion of the extended fingers DF on the substrate SU is located within the boundary LT of the orthographic projection of the encapsulation layer TFE on the substrate SU; the number of extended fingers DF located within the range covered by the encapsulation layer TFE can be greater than the number of extended fingers DF located outside the encapsulation layer TFE, so as to block water vapor and oxygen within the range of the encapsulation layer TFE. For example, for the first power bus VSB and the second power bus VDB, the extended fingers DF of the first fan-out segment VSB1 are the first extended fingers DF1, and the extended fingers DF of the second fan-out segment VDB1 are the second extended fingers DF2.

[0094] like Figure 6 and Figure 7 As shown, the length of the side of the fan-out segment can be increased by extending the fingers DF, extending the path for water vapor and oxygen to intrude, and increasing the difficulty of intrusion, so that even if water vapor and oxygen can enter the boundary of the encapsulation layer TFE, it is difficult for them to intrude the display area AA. The lengths L of at least some of the extended fingers DF are different, so that the lengths L of the extended fingers DF are uneven, which can reduce the risk of water vapor and oxygen directly corroding the display area AA along the distribution direction of the extended fingers DF. The side of the extended fingers DF has convex teeth DFs, and the convex teeth DFs can further extend the path for water vapor and oxygen to intrude, increasing the difficulty of intrusion.

[0095] like Figure 6-Figure 10 As shown, in some embodiments of the present disclosure, both sides of the extension finger DF are provided with convex teeth DFs, and the convex teeth DFs on both sides are symmetrically arranged. Of course, they can also be staggered, that is, on both sides of an extension finger DF, the convex teeth DFs on one side and the convex teeth DFs on the other side are alternately distributed along the extension direction of the extension finger DF. The spacing G between adjacent convex teeth DFs on the same side of the extension finger DF is equal, that is, the convex teeth DFs are evenly distributed.

[0096] like Fig.12 As shown, in some embodiments of the present disclosure, the convex teeth DFs belonging to the adjacent two sides of two adjacent extended fingers DF are staggered, so that the convex teeth DFs on one side and the convex teeth DFs on the other side are alternately distributed along the extension direction of the extended fingers DF, so that the convex teeth DFs on one side can be opposite to the area between the two convex teeth DFs on the other side, so that the convex teeth DFs on the adjacent two sides do not interfere with each other, thereby increasing the height of the convex teeth DFs. Fig.12As shown, the convex teeth DFs on one side can extend into the convex teeth DFs on the other side, forming a sawtooth gap between the two sides. In this way, the convex teeth DFS of adjacent extension fingers DF can be prevented from interfering with each other, the height of the convex teeth DFs can be increased, and the space can be fully utilized to extend the erosion path of water vapor and oxygen.

[0097] like Figure 8 As shown, in some embodiments of the present disclosure, the spacing S between two adjacent extended fingers DF can be made greater than the width H of the extended fingers DF to avoid the extended fingers DF being too close to each other, thereby reducing the process difficulty and preventing water vapor and oxygen from directly invading across the extended fingers DF instead of invading along the contour of the extended fingers DF due to the distance being too close. The height h2 of the convex tooth DFs is the distance between the point on the contour of the convex tooth DFs that is farthest from the side where it is located and the side. The width H of the extended finger DF is the sum of the width h1 between its two side edges and the height h2 of the two convex teeth DFs.

[0098] Furthermore, the inventors have concluded through experiments that when the distance between two adjacent extended fingers DF is greater than or equal to twice the width of the extended finger DF, that is, S≥2H, it can be ensured that water vapor and oxygen will not directly invade the extended fingers DF across the extended fingers DF along the arrangement direction of the extended fingers DF, but will move along the contours of the extended fingers DF and their convex teeth DFs, thereby playing a blocking role by extending the path.

[0099] In some embodiments of the present disclosure, the height h2 of the convex teeth DFs is less than the width h1 of the region where the convex teeth DFs are not provided, and the width h1 of the region where the convex teeth DFs are not provided of the extended fingers DF is equal to the width h1 of the two side edges thereof. Thus, it is avoided that the two side edges of the extended fingers DF are too thin and the convex teeth DFs are too high, which increases the difficulty of the process, and it is also possible to prevent the convex teeth DFs and the extended fingers DF from being damaged.

[0100] like Fig. 9 and Fig.10 As shown, the contour of the positive projection of the convex teeth DFs on the driving backplane BP can be a curve or a broken line, or a shape formed by connecting a straight line and an arc, which is not particularly limited here. In some embodiments of the present disclosure, the positive projection of the convex teeth DFs and the side edges of the extended fingers DF on the driving backplane BP is a smooth curve, and the contour of the convex teeth DFs and the side edges thereof are smoothly transitioned to reduce edges and corners and avoid puncturing the encapsulation layer TFE. At the same time, the convex teeth DFs with a curved contour can expand the size of the convex teeth DFs without changing the space, which can improve the strength of the convex teeth DFs and reduce the difficulty of the process.

[0101] like Figure 4As shown, for a fan-out segment stacked with multiple conductive parts VP, convex teeth DFs can be set on the side of at least one conductive part VP. Of course, convex teeth DFs can also be set on the sides of each conductive part VP, and the side of any conductive part VP belongs to the side of the fan-out segment.

[0102] In some embodiments of the present disclosure, each conductive part VP of the same fan-out segment has the above-mentioned convex teeth DFs, and any two convex teeth DFs belonging to different conductive parts VP are overlapped in a one-to-one correspondence, that is, the orthographic projections of the convex teeth DFs of different conductive parts VP on the substrate SU overlap in a one-to-one correspondence.

[0103] In some embodiments of the present disclosure, each conductive part VP of the same fan-out segment has the above-mentioned convex teeth DFs, and any two convex teeth DFs belonging to different conductive parts VP are staggered, that is, the orthographic projections of the two convex teeth DFs on the substrate SU do not overlap. The source and drain layers can be patterned by dry etching process, and there may be over-etching, the over-etching amount is generally 10% to 30%, and the over-etching amount is difficult to control, that is, the etching of the upper film layer may cause uneven damage to the lower film layer, resulting in increased unevenness of the stacked conductive parts VP, affecting the reliability test or actual use, and there is a risk of failure.

[0104] The extended finger DF may extend along an extension direction perpendicular to the fan-out segment where the extended finger DF is located, that is, the extended finger DF may extend along the row direction X. Of course, the extension direction of the extended finger DF may also form an angle with the column direction Y that is not a right angle.

[0105] In order to prevent water vapor and oxygen from invading along the distribution direction of the extension fingers DF, the lengths of at least two extension fingers DF on the same side of the same fan-out segment may be different, so as to prevent the extension fingers DF from being too dense in the extension direction of the fan-out segment and serving as paths for water vapor and oxygen to intrude. The length of the extension finger DF is the distance between the farthest point from the fan-out segment in its extension direction and the fan-out segment.

[0106] like Figure 8-Figure 10 As shown, the lengths of any two adjacent extended fingers DF can be different, and the lengths of the extended fingers DF can be arranged according to a certain sequence, which can be an arithmetic sequence or a non-arithmetic sequence, etc., and no special limitation is made here on the specific lengths. In addition, the lengths of the extended fingers DF can gradually increase, decrease, or be arranged in other sequences in the direction close to the display area AA, and no special limitation is made here.

[0107] In some embodiments of the present disclosure, each extended finger DF includes a first sub-extended finger DFf1 and a plurality of second sub-extended fingers DFf2, the length of the first sub-extended finger DFf1 is greater than the second sub-extended finger DFf2, the second sub-extended fingers DFfFf2 are distributed on both sides of the first sub-extended finger DFf1, and the lengths of adjacent second sub-extended fingers DFf2 may be the same or different. The number of extended fingers DF on both sides of the first sub-extended finger DFf1 may be the same or different, and is not specifically limited here.

[0108] In some embodiments of the present disclosure, the number of convex teeth DFs of at least two extended fingers DF may be different, and the number of convex teeth DFs of the extended finger DF with a longer length is greater than the number of convex teeth DFs of the extended finger DF with a shorter length. In some embodiments, the length of the extended finger DF may be positively correlated with the number of convex teeth DFs thereon, and the longer the length of the extended finger DF is, the more convex teeth DFs it has. Of course, in other embodiments, the number of convex teeth DFs of the extended finger DF with a longer length may be equal to or less than the number of convex teeth DFs of the extended finger DF with a shorter length.

[0109] Furthermore, the convex teeth DFs of different extended fingers DF may be staggered to avoid the extended fingers DF being too close to each other, thereby preventing water vapor and oxygen from invading the display area AA along the distribution direction of the extended fingers DF.

[0110] like Figure 6 and Figure 7 As shown, in some embodiments of the present disclosure, at least part of the second extended fingers DF2 are located on the side of the first extended fingers DF1 close to the display area AA, for example, all the second extended fingers DF2 are located on the side of the first extended fingers DF1 close to the display area AA. At the same time, there may be first extended fingers DF1 located outside the encapsulation layer TFE and first extended fingers DF1 located inside the encapsulation layer TFE. All the second extended fingers DF2 of the second fan-out segment VDB1 may be located inside the encapsulation layer TFE.

[0111] In some embodiments of the present disclosure, the number of first extended fingers DF1 may be greater than the number of second extended fingers DF2. For example, the side of the first side (the side close to the second fan-out segment VDB1) of the first fan-out segment VSB1 has seven first extended fingers DF1, one of which is located outside the boundary of the encapsulation layer TFE, and six of which are within the boundary of the encapsulation layer TFE; including a plurality of first sub-extended fingers DFf1 and second sub-extended fingers DFf2. There are three second sub-extended fingers DFf2 on each side of the first sub-extended finger DFf1; the second sub-extended finger DFf2 includes two lengths, and the length decreases along the direction away from the first sub-extended finger DFf1. The number of extended fingers DF on the side of the second side of the first fan-out segment VSB1 opposite to the first side is different, and there are five first extended fingers DF1, wherein the length of the first sub-extended finger DFf1 is the same as the length of the first sub-extended finger DFf1 on the first side, and there are second sub-extended fingers DFf2 on both sides thereof, but there is one second sub-extended finger DFf2 on the side close to the display area AA, and three second sub-extended fingers DFf2 are provided on the side away from the display area AA.

[0112] like Figure 6 and Figure 7 As shown, the second fan-out segment VDB1 has four second extension fingers DFf2, all of which are located on the side of the first extension finger DFf1 close to the display area AA and all of which are located within the boundary of the encapsulation layer TFE. The length of the first sub-extension finger DFf2 is the same as the length of the first sub-extension finger DFf1 of the first fan-out segment VSB1.

[0113] like Figure 8 and Fig.11 As shown, in some embodiments of the present disclosure, for the first extended finger DF1 and the second extended finger DF2 on the same side of the same fan-out segment; each extended finger DF may include a plurality of first sub-extended fingers DFf1 and second sub-extended fingers DFf2 alternately distributed along the column direction Y, wherein:

[0114] The lengths of the first sub-extended fingers DFf1 are the same, and the lengths of the second sub-extended fingers DFf2 are the same; the length of the first sub-extended finger DFf1 is greater than that of the second sub-extended finger DFf2; the absolute value of the length difference between the first sub-extended finger DFf1 and the second sub-extended finger DFf2 is greater than three times the width W of the convex tooth DFs in the row direction X, so that adjacent extended fingers have a sufficient length difference, reducing the area directly facing adjacent extended fingers in the column direction Y, preventing them from being too dense, and preventing water vapor and oxygen from directly invading the display area AA along the column direction Y.

[0115] Further, such as Fig.11 As shown, the number of the protruding teeth Dfs on one side of the first sub-extending finger DFf1 may be 5, and the protruding teeth Dfs are symmetrical on both sides. The number of the protruding teeth Dfs on one side of the second sub-extending finger DFf2 may be 1, and the protruding teeth Dfs are symmetrical on both sides.

[0116] In addition, if Figure 4 As shown, since the fan-out segment can be a multi-layer structure on both sides of the bending area BA, and the bending area needs to be bent, in order to improve flexibility, the fan-out segment can be disconnected in the bending area BA and can be connected through a transition part VL of a different layer from the fan-out segment. The transition part VL is a single-layer structure, which can improve flexibility compared to a multi-layer structure and prevent breakage during bending.

[0117] The first fan-out segment VSB1 may be provided with an opening VH extending along the column direction Y, and the opening VH is at least partially located in the bending area BA, and the first fan-out segment VSB1 is divided into two parts in the bending area BA. At least part of the data lines mentioned above may be located in the first gate layer, the second gate layer or a source and drain layer in the same layer on both sides of the bending area, but the data lines may be disconnected at the opening VH and connected through data adapter lines located in different layers, and the data adapter lines are located in the opening VH.

[0118] The present disclosure also provides a display device, which may include a display panel of any of the above embodiments. The display panel is a display panel of any of the above embodiments, and its specific structure and beneficial effects can be referred to the embodiments of the display panel above, which will not be repeated here. The display device of the present disclosure can be an electronic device with a display function such as a mobile phone, a tablet computer, a television, etc., which will not be listed one by one here.

[0119] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A display panel, characterized in that: The invention comprises a display area, an edge area and a fan-out area, wherein the edge area surrounds the display area, and the fan-out area is connected to a side of the edge area away from the display area along a column direction; the fan-out area comprises a bending area extending along a row direction and a binding area located on a side of the bending area away from the display area; The display panel comprises: A driving backplane, comprising a power bus, the power bus extending from the edge area to the fan-out area; the power bus comprising a fan-out section extending along the column direction and connected to the binding area through the bending area; at least one side of the fan-out section is provided with a plurality of extension fingers spaced apart along the column direction; the side of the extension finger has convex teeth; at least some of the extension fingers have different lengths; A light emitting device, arranged on one side of the driving backplane and located in the display area; A packaging layer covers the light-emitting device; a boundary of the packaging layer extends to the fan-out area and is located on a side of the bending area close to the display area; at least part of the extension finger is located within the boundary of the packaging layer.

2. The display panel according to claim 1, characterized in that: Any two adjacent extending fingers have different lengths.

3. The display panel according to claim 1, characterized in that: Each of the extending fingers includes a first sub-extending finger and a plurality of second sub-extending fingers. The first sub-extending finger is longer than the second sub-extending finger. The second sub-extending fingers are distributed on both sides of the first sub-extending finger.

4. The display panel according to claim 2, characterized in that: At least two of the extending fingers have different numbers of protruding teeth.

5. The display panel according to claim 1, characterized in that: Each of the extended fingers on the same side of the same fan-out segment includes a plurality of first sub-extended fingers and second sub-extended fingers alternately distributed along the column direction, the lengths of each of the first sub-extended fingers are the same, the lengths of each of the second sub-extended fingers are the same; the length of the first sub-extended finger is greater than that of the second sub-extended finger; the absolute value of the difference in length between the first sub-extended finger and the second sub-extended finger is greater than 3 times the width of the convex tooth in the row direction.

6. The display panel according to claim 1, characterized in that: Both side edges of the extending finger are provided with convex teeth, and the convex teeth on both side edges are symmetrically arranged.

7. The display panel according to claim 6, characterized in that: The convex teeth belonging to adjacent two sides of two adjacent extending fingers are staggered.

8. The display panel according to claim 1, characterized in that: The distance between two adjacent extending fingers is greater than the width of the extending fingers.

9. The display panel according to claim 8, characterized in that: The distance between two adjacent extending fingers is greater than or equal to twice the width of the extending fingers.

10. The display panel according to claim 1, characterized in that: At least part of the extending fingers are located outside the boundary of the encapsulation layer.

11. The display panel according to claim 1, characterized in that: The orthographic projection of the convex teeth and the side edges of the extending fingers on which they are located on the driving back plate is a smooth curve.

12. The display panel according to claim 1, characterized in that: The height of the protruding teeth is smaller than the width of a region where the protruding teeth are not provided.

13. The display panel according to claim 1, characterized in that: The number of the power buses is multiple, and includes a first power bus and a second power bus; the fan-out segment of the first power bus is a first fan-out segment, and the extension finger of the first fan-out segment is a first extension finger; The fan-out segment of the second power bus is a second fan-out segment, and the extension finger of the second fan-out segment is a second extension finger; The driving backplane has a plurality of pixel circuits and power lines, at least part of the pixel circuits are located in the display area; the light emitting device comprises a first electrode, a light emitting layer and a second electrode stacked in a direction away from the driving backplane; Each of the power lines extends along the column direction and is connected to the second power bus; the second electrode is connected to the first power bus; At least a portion of the second extending fingers is located on a side of the first extending fingers close to the display area.

14. The display panel according to claim 13, characterized in that: The number of the first fan-out segments is two; the second fan-out segment is located between the two first fan-out segments; The number of the first extending fingers is greater than the number of the second extending fingers.

15. The display panel according to any one of claims 1 to 14, characterized in that: The driving backplane comprises a substrate and a semiconductor layer, a first gate layer, a second gate layer and at least one source-drain layer distributed in a direction away from the substrate; at least a part of the fan-out segment and its extension finger are located in at least one of the source-drain layers; The source-drain layer includes a first protective conductive layer, a main conductive layer, and a second protective conductive layer which are sequentially stacked in a direction away from the substrate.

16. The display panel according to claim 15, characterized in that: The portion of the fan-out segment located between the fan-out area and the display area includes a plurality of conductive parts stacked and arranged, one of the conductive parts is located in one of the source and drain layers; and a side edge of at least one of the conductive parts has the convex teeth.

17. The display panel according to claim 16, characterized in that: Each of the conductive parts of the same fan-out segment has the convex teeth, and the convex teeth of any two conductive parts are overlapped and arranged in a one-to-one correspondence.

18. The display panel according to claim 16, characterized in that: Each of the conductive parts of the same fan-out segment has the convex teeth, and the convex teeth of any two conductive parts are staggered.

19. A display panel, characterized in that: The invention comprises a display area, an edge area and a fan-out area, wherein the edge area surrounds the display area, and the fan-out area is connected to a side of the edge area away from the display area along a column direction; the fan-out area comprises a bending area extending along a row direction and a binding area located on a side of the bending area away from the display area; The display panel comprises: A driving backplane, comprising a power bus, the power bus extending from the edge area to the fan-out area; the power bus comprising a fan-out section extending along the column direction and connected to the binding area through the bending area; at least one side of the fan-out section is provided with a plurality of extension fingers spaced apart along the column direction; the side of the extension finger has convex teeth; at least some of the extension fingers have different lengths, and the length of the extension finger is positively correlated with the number of convex teeth thereon; A light emitting device, arranged on one side of the driving backplane and located in the display area; A packaging layer covers the light-emitting device; a boundary of the packaging layer extends to the fan-out area and is located on a side of the bending area close to the display area; at least part of the extension finger is located within the boundary of the packaging layer.

20. A display device, characterized in that: A display panel comprising any one of claims 1-19.

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