Display panel and display apparatus

Abstract

The present disclosure relates to the technical field of display. Provided are a display panel and a display apparatus. The display panel 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 the side of the edge area that is away from the display area; and the fan-out area comprises a bending area and a bonding area, which extend in a row direction. The display panel comprises: a driving backplane, which has a power source bus, wherein the power source bus extends from the edge area to the fan-out area, the power source bus comprises a fan-out section, which extends in a column direction and is connected to the bonding area by means of the bending area, at least one side edge of the fan-out section is provided with a plurality of extended fingers, which are distributed at intervals in the column direction, side edges of the extended fingers have protruding teeth, and at least some of the extended fingers have different lengths; a light-emitting device, which is arranged on one side of the driving backplane and is located in the display area; and an encapsulation layer, which covers the light-emitting device, wherein a boundary of the encapsulation layer extends to the fan-out area and is located on the side of the bending area that is close to the display area, and at least some of the extended fingers are located within the boundary of the encapsulation layer. (FIG. 6)

Description

Display panel and display device

[0001] Cross-references

[0002] This disclosure claims priority to Chinese patent application number 202311022676.6 filed on August 14, 2023, entitled “Display Panel and Display Device,” and the entire contents of this Chinese patent application are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0004] In display panels that use organic light-emitting diodes (OLEDs) as light-emitting devices, the organic materials of these devices are easily corroded by moisture, oxygen, and other factors, resulting in poor display quality or even failure. Therefore, the packaging quality of the OLEDs is directly related to the display quality and lifespan of the display panel. However, the barrier performance of existing display panels against moisture, oxygen, and other factors still needs to be improved.

[0005] 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 prior art known to ordinary technicians in the field.

[0006] Summary of the Invention

[0007] 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 that can improve the packaging effect.

[0008] 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;

[0009] The display panel includes:

[0010] A driver backplane having a power bus extending from the edge region to the fan-out region; the power bus including a fan-out segment extending along the column direction and connected to the binding region through the bending region; at least one side of the fan-out segment is provided with a plurality of extension fingers spaced apart along the column direction; the sides of the extension fingers have convex teeth; at least some of the extension fingers have different lengths;

[0011] A light emitting device is provided on one side of the driving backplane and is located in the display area;

[0012] An encapsulation layer covers the light-emitting device; a boundary of the encapsulation 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 encapsulation layer.

[0013] In an exemplary embodiment of the present disclosure, any two adjacent extending fingers have different lengths.

[0014] 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.

[0015] In an exemplary embodiment of the present disclosure, at least two of the extending fingers have different numbers of protruding teeth.

[0016] In an exemplary embodiment of the present disclosure, the length of the extension finger is positively correlated with the number of protruding teeth thereon.

[0017] 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.

[0018] In an exemplary embodiment of the present disclosure, both sides of the extending finger are provided with convex teeth, and the convex teeth on both sides are symmetrically arranged.

[0019] In an exemplary embodiment of the present disclosure, the protruding teeth on adjacent side edges of two adjacent extending fingers are staggered.

[0020] In an exemplary embodiment of the present disclosure, the distance between two adjacent extending fingers is greater than the width of the extending fingers.

[0021] 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.

[0022] In an exemplary embodiment of the present disclosure, at least part of the extended fingers are located outside the boundary of the encapsulation layer.

[0023] In an exemplary embodiment of the present disclosure, the orthographic projections of the protruding teeth and the side edges of the extending fingers on which they are located on the driving backplate are smooth curves.

[0024] In an exemplary embodiment of the present disclosure, the height of the protruding teeth is smaller than the width of a region where the protruding teeth are not provided.

[0025] In an exemplary embodiment of the present disclosure, the power bus is multiple in number 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 extended finger of the first fan-out segment is a first extended finger; the fan-out segment of the second power bus is a second fan-out segment, and the extended finger of the second fan-out segment is a second extended finger;

[0026] 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 includes a first electrode, a light-emitting layer, and a second electrode stacked in a direction away from the driving backplane;

[0027] 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;

[0028] At least a portion of the second extending finger is located on a side of the first extending finger close to the display area.

[0029] 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;

[0030] The number of the first extending fingers is greater than the number of the second extending fingers.

[0031] 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 and drain layer distributed in a direction away from the substrate; at least a portion of the fan-out segment and its extension are located in at least one of the source and drain layers;

[0032] The source-drain layer includes a first protective conductive layer, a main conductive layer, and a second protective conductive layer stacked in sequence in a direction away from the substrate.

[0033] 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 at least one side of the conductive portion has the convex teeth.

[0034] In an exemplary embodiment of the present disclosure, each of the conductive portions of the same fan-out segment has the convex teeth, and the convex teeth of any two conductive portions are overlapped and arranged in a one-to-one correspondence.

[0035] In an exemplary embodiment of the present disclosure, each of the conductive portions of the same fan-out segment has the convex teeth, and the convex teeth of any two conductive portions are staggered.

[0036] 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;

[0037] The display panel includes:

[0038] A driver backplane having a power bus extending from the edge region to the fan-out region; the power bus including a fan-out segment extending along the column direction and connected to the binding region through the bending region; at least one side of the fan-out segment is provided with a plurality of extended fingers spaced apart along the column direction; the sides of the extended fingers have convex teeth; at least some of the extended fingers have different lengths, and the length of the extended fingers is positively correlated with the number of convex teeth thereon;

[0039] A light emitting device is provided on one side of the driving backplane and is located in the display area;

[0040] An encapsulation layer covers the light-emitting device; a boundary of the encapsulation 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 encapsulation layer.

[0041] According to one aspect of the present disclosure, a display device is provided, comprising any one of the display panels described above.

[0042] 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 life of the product. 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, further extending the erosion path. In addition, the lengths of at least some of the extended fingers are different, that is, the lengths of the extended fingers are uneven, which can reduce the risk of water vapor and oxygen directly eroding the display area along the distribution direction of each extended finger.

[0043] 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 disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are incorporated into 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 drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0045] FIG1 is a top view of an embodiment of a display panel disclosed herein.

[0046] FIG. 2 is a schematic diagram showing the distribution of wiring in an embodiment of a display panel disclosed herein.

[0047] FIG3 is a partial cross-sectional schematic diagram of a display area in an embodiment of a display panel disclosed herein.

[0048] FIG4 is a partial cross-sectional schematic diagram of a peripheral area of ​​a display panel according to an embodiment of the present disclosure.

[0049] FIG5 is a partial cross-sectional schematic diagram of a source / drain layer in an embodiment of a display panel disclosed herein.

[0050] FIG6 is a partial top view of the peripheral area of ​​an embodiment of a display panel according to the present disclosure.

[0051] FIG. 7 is a partial view of FIG. 6 .

[0052] FIG8 is a partial enlarged view of a first power bus in an embodiment of a display panel disclosed herein.

[0053] FIG9 is a partial enlarged view of the first power bus in another embodiment of the display panel disclosed herein.

[0054] FIG10 is a partial enlarged view of the first power bus in yet another embodiment of the display panel disclosed herein.

[0055] FIG. 11 is a partially enlarged view of a first power bus in an embodiment of a display panel according to the present disclosure.

[0056] FIG12 is a partial enlarged view of the first power bus in one embodiment of the display panel disclosed herein. DETAILED DESCRIPTION

[0057] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent identical or similar structures, and thus their detailed descriptions will be omitted. Furthermore, the figures are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0058] 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 open-ended inclusion and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used only as labels and are not intended to limit the quantity of their objects.

[0059] The row direction X and column direction Y herein are merely two mutually perpendicular directions. In the drawings of this disclosure, the row direction X may be horizontal and the column direction Y may be vertical, but the present invention 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.

[0060] An embodiment of the present disclosure provides a display panel, as shown in FIG1 , wherein the display panel may include a display area AA, an edge area EA, and a fan-out area FA. 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.

[0061] As shown in FIG2 to FIG4, the display panel includes a driving backplane BP, a light-emitting device LD and an encapsulation layer TFE, wherein:

[0062] The driver backplane BP has a power bus extending from the edge area EA to the fan-out area FA. The power bus includes a fan-out segment extending along the column direction Y and connected to the binding area PA via the bending area BA. At least one side of the fan-out segment is provided with a plurality of extension fingers DF spaced apart along the column direction Y. The sides of the extension fingers DF have convex teeth DFs. At least some of the extension fingers DF have different lengths.

[0063] The light emitting device LD is provided on one side of the driving backplane BP and is located in the display area AA;

[0064] 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.

[0065] 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 life of the product. At the same time, the convex teeth DFs on the side of the extension finger DF can further extend the length of the side of the extension finger DF, further extending 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.

[0066] The display panel of the present disclosure is described in detail below:

[0067] As shown in Figures 1 and 2 , the display panel includes a display area AA and a peripheral area located outside the display area AA. The peripheral area can be a continuous or discontinuous annular region surrounding the display area AA, or it can be a semi-enclosed region. The shape of the peripheral area is not particularly limited herein. The peripheral area can include an edge region EA surrounding the display area AA and a fan-out region FA connected to the side of the edge region EA away from the display area AA along the column direction Y.

[0068] The fan-out area FA may include a bending area BA and a binding area PA distributed along the column direction Y. 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 output direction. The binding area PA has at least one driver chip and multiple pins connected to the driver chip. The pins of the binding area PA can be connected to a flexible circuit board, and the flexible circuit board can be bound to a control circuit board to achieve the connection between the display panel and the control circuit board, so that the display panel can be controlled by the control circuit board to display an image. Of course, the binding area PA can also be provided with no driver chip, and the driver chip can be provided on the flexible circuit board or the control circuit board and connected to the pins of the binding area PA to achieve display.

[0069] As shown in FIG3 and FIG4, the display panel may include a driving backplane BP, light-emitting devices LD and an encapsulation layer TFE. The light-emitting devices LD may be provided on one side of the driving backplane BP, and the encapsulation layer TFE covers each light-emitting device LD, wherein:

[0070] 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 area of ​​a part of the pixel circuits may be located in the peripheral area WA.

[0071] Each pixel circuit may include multiple transistors and storage capacitors. The pixel circuit may be a 3T1C, 7T1C, or other pixel circuit. nTmC indicates that a pixel circuit includes n transistors (represented by the letter "T") and m capacitors (represented 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 also be connected to multiple light-emitting devices LD.

[0072] The peripheral circuitry of the driver backplane (BP) may include a gate drive circuit, a light-emitting control circuit, and other circuits for scanning pixel circuits. The gate drive circuit may include multiple gate shift register units cascaded along the column direction (Y), with each gate shift register unit capable of scanning at least one row of pixel circuits. The light-emitting control circuit also includes multiple light-emitting shift register units cascaded along the column direction (Y), with each light-emitting shift register unit capable of scanning at least one row of pixel circuits. The gate drive circuit is located between the light-emitting control circuit and the display area (AA). Both the gate drive circuit and the light-emitting control circuit may be connected to the bonding area (PA) via drive traces.

[0073] 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. 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.

[0074] As shown in FIG2 , in some embodiments of the present disclosure, a 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, and the fan-out segment of the second power bus VDB is the second fan-out segment VDB1. The first fan-out segment VSB1 and the second fan-out segment VDB1 may be spaced apart along the row direction X. Furthermore, 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. The two first fan-out segments VSB1 may be spaced along the row direction X. Simultaneously, 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. The first connecting segment VSB2 is located outside the second connecting segment VDB2, i.e., 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 on a side of the first power bus VSB away from the display area AA, that is, located outside the first power bus VSB.

[0075] As shown in FIG2 , the driving backplane BP may include power lines VDL extending along a column direction Y. These lines may pass through the display area AA. A column of pixel circuits may be connected to a power line VDL, thereby connecting the power line VDL and the light-emitting device LD via the pixel circuit. Furthermore, the second electrode CAT of each light-emitting device LD may comprise a continuous, single-layer structure and may be connected to the first connection segment VSB2 of the first power bus VSB. A first power signal may be transmitted to the light-emitting device LD via the first power bus VSB. Each power line VDL may be connected to the second connection segment VDB2 of the second power bus VDB. This allows the second power bus VDB to be connected to the first electrode ANO of the light-emitting device LD via the power line VDL and the pixel circuit, thereby transmitting a second power signal.

[0076] Furthermore, the driving backplane BP may further include multiple data lines distributed along the row direction X. Each data line may be connected to at least one column of pixel circuits and is used to transmit a data signal to the pixel circuit for controlling the brightness of the light-emitting device LD. The data line may pass through the display area AA along the column direction and pass through the edge area EA and the bending area BA before connecting to the bonding area PA.

[0077] The following is an exemplary description of each film layer of the driving backplane BP:

[0078] As shown in Figures 3 and 4 , the driving backplane BP may include a substrate SU, a semiconductor layer SE, a first gate layer GA1, a second gate layer GA2, and at least one source / drain layer, extending away from the substrate SU. The active portion of the transistor in the pixel circuit may be located in the semiconductor layer SE, the transistor gate 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 enables connection between at least some of the transistors and the capacitor. Furthermore, 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 segment and its extended finger DF may be located in at least one source / drain layer.

[0079] 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. The first gate insulating layer GI1 may cover the semiconductor layer SE, and the first gate layer GA1 may be disposed on a surface of the first gate insulating layer GI1 that is remote from the substrate SU. The second gate insulating layer GI2 covers the first gate layer GA1, and the second gate layer GA2 is disposed on a surface of the second gate insulating layer GI2 that is remote from the substrate SU. The interlayer dielectric layer ILD covers the second gate layer GA2, and each source and drain layer may be disposed on a side of the interlayer dielectric layer ILD that is remote from the substrate SU.

[0080] As shown in FIG3 , in some embodiments of the present disclosure, there are two source / drain layers, including a first source / drain layer SD1 and a second source / drain layer SD2. The driving backplane BP also includes a first planar layer PLN1 and a second planar layer PLN2, wherein the first source / drain layer SD1 can be provided on the surface of the interlayer dielectric layer ILD away from the substrate SU. The first planar layer PLN1 covers the first source / drain layer SD1. Of course, the first source / drain layer SD1 can also be covered with a passivation layer, and then covered with the first planar layer PLN1. The second source / drain layer SD2 is provided on the surface of the first planar layer PLN1 away from the substrate SU, and the second planar layer PLN2 covers the second source / drain layer SD2. The first electrode ANO of the light-emitting device LD is provided on the surface of the second planar layer PLN2 away from the substrate SU.

[0081] In some embodiments of the present disclosure, there is only one source / drain layer, and the driving backplane BP may further include a planar layer. The source / drain layer may be disposed on a surface of the interlayer dielectric layer ILD away from the substrate SU. The planar layer covers the source / drain layer. The first electrode ANO of the light-emitting device LD is disposed on a surface of the planar layer away from the substrate SU.

[0082] There are three source / drain layers, including a first source / drain layer SD1, a second source / drain layer SD2, and a third source / drain layer. The driver backplane BP also includes a first planar layer PLN1, a second planar layer PLN2, and a third planar layer. The first source / drain layer SD1 can be located on the surface of the interlayer dielectric layer ILD away from the substrate SU. The first planar layer PLN1 covers the first source / drain layer SD1. Of course, the first source / drain layer SD1 can also be covered with a passivation layer, which can then be covered with the first planar layer PLN1. The second source / drain layer SD2 is located on the surface of the first planar layer PLN1 away from the substrate SU, and the second planar layer PLN2 covers the second source / drain layer SD2. The third source / drain layer is located on the surface of the second planar layer PLN2 away from the substrate SU, and the third planar layer covers the second source / drain layer SD2. The first electrode ANO of the light-emitting device LD is located on the surface of the third planar layer away from the substrate SU.

[0083] The source / drain layer may be a single-layer or multi-layer structure. As shown in FIG5 , 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 sequentially in a direction away from the substrate SU. The first protective conductive layer S1 and the second protective conductive layer S3 are thinner and less conductive than the main conductive layer S2, and have good oxidation resistance, thereby improving lifespan while conducting electricity. The main conductive layer S2 can be used to reduce resistance and improve conductivity. When the source / drain layer pattern is formed by an etching process, 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, causing the sidewalls of the main conductive layer S2 to be concave relative to the sidewalls 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 can be made of metal titanium, and the main conductive layer S2 can 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 can also be made of other conductive materials such as metal oxides, and the main conductive layer S2 can also be made of other metals such as metal silver.

[0084] 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 between 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, with one conductive portion VP located in one 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 may have two layers, and the two layers may be located in the first source / drain layer SD1 and the second source / drain layer SD2, respectively.

[0085] As shown in FIG3 , 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., and 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:

[0086] 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, integral 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. The first electrodes ANO are arranged 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. The pixel definition layer PDL may have an opening that exposes each first electrode ANO, and the light-emitting layer EL is stacked with the first electrode ANO within the opening.

[0087] As shown in FIG3 , the encapsulation layer TFE may cover the light emitting device LD to protect the light emitting device LD and prevent the light emitting device LD from being corroded by external moisture, oxygen, etc.

[0088] As shown in FIG3 and FIG4 , in some embodiments of the present disclosure, the encapsulation layer TFE may 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:

[0089] 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.

[0090] The organic layer IJP can be disposed on the surface of the first inorganic layer CVD1 facing away from the driving backplane BP. The boundary of the organic layer IJP is defined within the boundary of the first inorganic layer CVD1. The boundary of the orthographic projection of the organic layer IJP on the driving backplane BP can be located in the peripheral area WA, ensuring that the organic layer IJP covers each light-emitting device LD. The organic layer IJP can be made of an organic material such as resin, and its fluidity can be utilized to achieve planarization.

[0091] The second inorganic layer CVD2 covers the organic layer IJP and the first inorganic layer CVD1 not covered by the organic layer IJP, thereby encapsulating the organic layer IJP. The second inorganic layer CVD2 can be made of the same material as the first inorganic layer CVD1, or can be made of an inorganic material that blocks water vapor and oxygen, such as silicon nitride or silicon oxide. This prevents the intrusion of water and oxygen through the second inorganic layer CVD2. The orthographic projections of the boundaries of the first and second inorganic layers CVD1 and CVD2 on the driving backplane BP can overlap.

[0092] Furthermore, to limit the extent of the inorganic layer, an annular barrier dam can be provided in the edge area EA, surrounding the display area AA. This barrier dam can be provided on the driving backplane BP and can be formed simultaneously with the process of forming layers such as the planarization layer and the pixel definition layer (PDL). For example, there can be two barrier dams: a first barrier dam Dam1 and a second barrier dam Dam2 surrounding the first barrier dam Dam1. The second barrier dam Dam2 is taller than the first barrier dam Dam1, and both can be located in the edge area EA.

[0093] The first inorganic layer CVD1 covers the first and second barrier dams Dam1 and Dam2 and protrudes at the first and second barrier dams Dam1 and Dam2 . The organic layer IJP is confined within the range surrounded by the first barrier dam Dam1 , ie, within the range surrounded by the protrusion.

[0094] Furthermore, as shown in Figures 4, 6, and 7, the encapsulation layer TFE can cover the display area AA and extend to the edge area EA and fan-out area. 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.

[0095] The inventors discovered that the encapsulation layer TFE does not completely cover the entire area of ​​the driver backplane BP, allowing water vapor and oxygen to enter the encapsulation layer TFE and erode the display area AA along the fan-out section. Specifically, for the source and drain layers of the multi-layer structure, the etching rate of the first protective conductive layer S1 and the second protective conductive layer S3 is lower than that of the main conductive layer S2, causing the sidewalls of the main conductive layer S2 to be concave relative to the sidewalls of the first protective conductive layer S1 and the second protective conductive layer S3. This concave area is difficult to completely fill with the planarization layer and the encapsulation layer TFE, thereby forming a channel CH within the encapsulation layer TFE, through which water vapor and oxygen can intrude into the display area AA. Even in the area covered by the encapsulation layer TFE, water vapor and oxygen may still intrude into the display area AA.

[0096] To address the aforementioned issues, the intrusion path can be extended to increase the difficulty of intrusion, thereby ensuring effective packaging and extending the life of the light-emitting device LD. Specifically, at least one side of the fan-out segment has multiple extended fingers DF spaced along the column direction Y. At least a portion of the extended fingers DF is located within the coverage area of ​​the encapsulation layer TFE. That is, the orthographic projections of at least a portion of the extended fingers DF on the substrate SU are within the boundary LT of the orthographic projection of the encapsulation layer TFE on the substrate SU. The number of extended fingers DF within the coverage area of ​​the encapsulation layer TFE can be greater than the number of extended fingers DF outside the encapsulation layer TFE, thereby blocking moisture and oxygen within 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 first extended fingers DF1, and the extended fingers DF of the second fan-out segment VDB1 are second extended fingers DF2.

[0097] As shown in Figures 6 and 7, the extended fingers DF increase the length of the fan-out segment's sides, lengthening the path for water vapor and oxygen to enter and making it more difficult for them to enter. Even if water vapor and oxygen can enter the boundaries of the encapsulation layer TFE, they are unlikely to penetrate the display area AA. At least some of the extended fingers DF have different lengths L, resulting in uneven lengths L across the extended fingers DF. This reduces the risk of water vapor and oxygen directly encroaching on the display area AA along the distribution of the extended fingers DF. The extended fingers DF have raised teeth DFs on their sides, further lengthening the path for water vapor and oxygen to enter, making it more difficult for them to enter.

[0098] As shown in Figures 6-10, in some embodiments of the present disclosure, convex teeth DFs are provided on both sides of the extension finger DF, and the convex teeth DFs on both sides are symmetrically arranged. Of course, they can also be staggered. That is, on the two sides of an extension finger DF, the convex teeth DFs on one side are alternately distributed with the convex teeth DFs on the other side 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.

[0099] As shown in Figure 12, in some embodiments of the present disclosure, the protruding teeth DFs on adjacent sides of two adjacent extended fingers DF are staggered, such that the protruding teeth DFs on one side alternate with the protruding teeth DFs on the other side along the extension direction of the extended fingers DF. This allows the protruding teeth DFs on one side to face the area between the two protruding teeth DFs on the other side, preventing interference between the protruding teeth DFs on the adjacent sides and thereby increasing the height of the protruding teeth DFs. In some embodiments, as shown in Figure 12, the protruding teeth DFs on one side can extend between the protruding teeth DFs on the other side, forming a zigzag gap between the two sides. This prevents interference between the protruding teeth DFS of adjacent extended fingers DF, increases the height of the protruding teeth DFs, and fully utilizes the space to extend the erosion path for water vapor and oxygen.

[0100] As shown in Figure 8, in some embodiments of the present disclosure, the spacing S between two adjacent extended fingers DF can be greater than the width H of the extended fingers DF. This prevents the extended fingers DF from being too close together, thereby reducing process complexity and preventing moisture and oxygen from invading directly across the extended fingers DF rather than along their contours. The height h2 of a convex tooth DFs is the distance between the point on the contour of the convex tooth DFs farthest from the side edge on which it is located and the side edge. The width H of an extended finger DF is the sum of the width h1 between its two sides and the height h2 of the two convex teeth DFs.

[0101] 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.

[0102] In some embodiments of the present disclosure, the height h2 of the protruding teeth DFs is less than the width h1 of the area without protruding teeth DFs. The width h1 of the area without protruding teeth DFs on the extended fingers DF is equal to the width h1 of their two side edges. This prevents the extended fingers DF from having too thin sides and too high protruding teeth DFs, which would increase manufacturing difficulties, and also prevents damage to the protruding teeth DFs and extended fingers DF.

[0103] As shown in Figures 9 and 10, the contour of the orthographic projection of the convex teeth DFs on the driver backplane BP can be a curve or a broken line, or a shape formed by connecting a straight line and an arc, and is not specifically limited here. In some embodiments of the present disclosure, the orthographic projection of the convex teeth DFs and the side edges of the extended fingers DF on the driver backplane BP is a smooth curve, and the contour of the convex teeth DFs and the side edges on which they are located have a smooth transition, reducing sharp corners and avoiding 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 while keeping the space unchanged, thereby increasing the strength of the convex teeth DFs and reducing the difficulty of the process.

[0104] As shown in FIG4 , for a fan-out segment stacked by multiple conductive parts VP, convex teeth DFs may be provided on the side of at least one conductive part VP. Of course, convex teeth DFs may also be provided 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.

[0105] In some embodiments of the present disclosure, each conductive portion VP of the same fan-out segment has the above-mentioned convex teeth DFs, and any two convex teeth DFs belonging to different conductive portions VP are overlapped in a one-to-one correspondence, that is, the orthographic projections of the convex teeth DFs of different conductive portions VP on the substrate SU overlap in a one-to-one correspondence.

[0106] In some embodiments of the present disclosure, each conductive portion VP of the same fan-out segment has the aforementioned ridges DFs, and any two ridges DFs belonging to different conductive portions VP are staggered, meaning their orthographic projections on the substrate SU do not overlap. The source and drain layers can be patterned using a dry etching process, which can result in over-etching, typically ranging from 10% to 30%, and this amount is difficult to control. This means that etching of the upper film layer may cause uneven damage to the underlying film layer, leading to increased non-uniformity in the stacked conductive portions VP, affecting reliability testing or actual use, and posing a risk of failure.

[0107] The extended fingers DF may extend in a direction perpendicular to the extension direction of the fan-out segment in which they are located, that is, the extended fingers DF may extend in the row direction X. Of course, the extension direction of the extended fingers DF may also form an angle with the column direction Y that is not a right angle.

[0108] To prevent moisture and oxygen from invading along the distribution direction of the extension fingers (DF), at least two extension fingers (DF) on the same side of the same fan-out segment can have different lengths. This prevents the extension fingers (DF) from being too densely packed along the fan-out segment's extension direction, potentially serving as pathways for moisture and oxygen intrusion. The length of an extension finger (DF) is the distance from the fan-out segment to its furthest point along its extension direction.

[0109] As shown in Figures 8-10 , any two adjacent extended fingers DF can have different lengths. The lengths of the extended fingers DF can be arranged according to a specific sequence, which can be an arithmetic progression or a non-arithmetic progression, and the specific lengths are not specifically limited here. Furthermore, the lengths of the extended fingers DF can gradually increase, decrease, or be arranged in any other sequence as they approach the display area AA, and there are no specific restrictions here.

[0110] In some embodiments of the present disclosure, each extended finger DF includes a first sub-extended finger DFf1 and multiple second sub-extended fingers DFf2. The first sub-extended finger DFf1 is longer than the second sub-extended fingers 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 can be the same or different. The number of extended fingers DF on both sides of the first sub-extended finger DFf1 can be the same or different, without special limitation herein.

[0111] In some embodiments of the present disclosure, the number of protruding teeth DFs on at least two extended fingers DF may differ, with the longer extended finger DF having more protruding teeth DFs than the shorter extended finger DF. In some embodiments, the length of the extended finger DF may be positively correlated with the number of protruding teeth DF thereon, with the longer the extended finger DF, the greater the number of protruding teeth DF. Of course, in other embodiments, the number of protruding teeth DFs on the longer extended finger DF may be equal to or less than the number of protruding teeth DFs on the shorter extended finger DF.

[0112] Furthermore, the protruding 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.

[0113] As shown in Figures 6 and 7, in some embodiments of the present disclosure, at least some of the second extended fingers DF2 are located on the side of the first extended fingers DF1 closest to the display area AA. For example, all second extended fingers DF2 are located on the side of the first extended fingers DF1 closest to the display area AA. Furthermore, some first extended fingers DF1 may be located outside the encapsulation layer TFE, while others may be located inside the encapsulation layer TFE. The second extended fingers DF2 of the second fan-out segment VDB1 may all be located within the encapsulation layer TFE.

[0114] 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 first side of the first fan-out segment VSB1 (the side adjacent to the second fan-out segment VDB1) has seven first extended fingers DF1: one located outside the encapsulation layer TFE boundary and six located within the encapsulation layer TFE boundary. These include a plurality of first sub-extended fingers DFf1 and second sub-extended fingers DFf2. Three second sub-extended fingers DFf2 are located on either side of each first sub-extended finger DFf1. The second sub-extended fingers DFf2 have two lengths, decreasing in length as they move away from the first sub-extended fingers DFf1. The second side of the first fan-out segment VSB1, opposite the first side, has a different number of extended fingers DF1, including five first extended fingers DF1. The first sub-extended fingers DFf1 have the same length as the first sub-extended fingers DFf1 on the first side, and both sides have second sub-extended fingers DFf2. However, there is one second sub-extended finger DFf2 located on the side adjacent to the display area AA, while three second sub-extended fingers DFf2 are located on the side distal to the display area AA.

[0115] As shown in Figures 6 and 7 , the second fan-out segment VDB1 has four second extended fingers DFf2, all of which are located on the side of the first extended finger DFf1 close to the display area AA and all within the boundary of the encapsulation layer TFE. The length of the first sub-extended finger DFf2 is the same as the length of the first sub-extended finger DFf1 of the first fan-out segment VSB1.

[0116] As shown in FIG8 and FIG11 , in some embodiments of the present disclosure, for a first extended finger DF1 and a 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 a column direction Y, wherein:

[0117] 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 lengths of the first sub-extended fingers DFf1 are greater than the lengths of the second sub-extended fingers DFf2; the absolute value of the length difference between the first sub-extended fingers DFf1 and the second sub-extended fingers 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 where adjacent extended fingers face each other 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.

[0118] 11 , the number of protruding teeth Dfs on one side of the first sub-extended finger DFf1 may be 5 and symmetrical. The number of protruding teeth Dfs on one side of the second sub-extended finger DFf2 may be 1 and symmetrical.

[0119] In addition, as shown in Figure 4, 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 portion VL on a different layer from the fan-out segment. The transition portion VL is a single-layer structure, which can improve flexibility compared to a multi-layer structure and prevent breakage during bending.

[0120] The first fan-out segment VSB1 may be provided with an opening VH extending along the column direction Y. The opening VH is at least partially located in the bending area BA and divides the first fan-out segment VSB1 into two parts in the bending area BA. At least part of the data lines mentioned above may be located in the same layer on both sides of the bending area and arranged in the first gate layer, the second gate layer or a source and drain layer, but the data lines may be disconnected at the opening VH and connected through data adapter lines located in different layers. The data adapter lines are located in the opening VH.

[0121] The present disclosure further provides a display device, which may include a display panel according to any of the aforementioned embodiments. The display panel is a display panel according to any of the aforementioned embodiments. Its specific structure and beneficial effects can be found in the display panel embodiments described above and will not be further described here. The display device of the present disclosure may be an electronic device with a display function, such as a mobile phone, tablet computer, or television, and these will not be listed here.

[0122] 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 variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A display panel, 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 includes a bending area extending along the 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, wherein: Any two adjacent extending fingers have different lengths.

3. The display panel according to claim 1, wherein: 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, wherein: At least two of the extending fingers have different numbers of protruding teeth.

5. The display panel according to claim 1, wherein: 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, wherein: 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, wherein: The convex teeth belonging to adjacent two sides of two adjacent extending fingers are staggered.

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

9. The display panel according to claim 8, wherein: 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, wherein: At least part of the extending fingers are located outside the boundary of the encapsulation layer.

11. The display panel according to claim 1, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, 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 includes a bending area extending along the 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 comprising the display panel according to any one of claims 1 to 19.

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