Display panel and display device

Abstract

The invention provides a display panel and a display device, relates to the technical field of display, and is used for optimizing the structural design of a cathode layer, so that the cathode layer can better meet the requirements of different display areas on cathode voltage. The display panel comprises a display area and a non-display area, the display area comprises a first display area and a second display area surrounding the first display area, and the transmittance of at least part of the first display area is larger than that of the second display area; a substrate; the light-emitting device layer comprises a cathode layer, the cathode layer at least comprises a first cathode part located in the first display area and a second cathode part located in the second display area, and a gap is formed between the first cathode part and the second cathode part; the first cathode wire is located in the non-display area, and the first cathode wire is electrically connected with the first cathode part through a first connecting wire.

Description

Technical Field

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

[0002] Organic Light Emitting Diode (OLED) display panels are widely used in various display fields due to advantages such as good color performance, high contrast ratio, and fast response speed.

[0003] Currently, the cathode layer in such display panels is usually a whole film layer covering the display area. However, this design has certain limitations and is difficult to accurately adapt to the requirements of cathode voltages in different display areas, and thus it is difficult to further optimize the display effect. Summary of the Invention

[0004] Embodiments of the present invention provide a display panel and a display device for optimizing the structural design of the cathode layer so that it can better adapt to the requirements of cathode voltages in different display areas.

[0005] In a first aspect, embodiments of the present invention provide a display panel, including: A display area and a non-display area, wherein the display area includes a first display area and a second display area surrounding the first display area, and the transmittance of at least some regions in the first display area is greater than that of the second display area; A substrate; A light-emitting device layer, including a cathode layer, the cathode layer includes a first cathode portion at least located in the first display area and a second cathode portion located in the second display area, and there is a gap between the first cathode portion and the second cathode portion; A first cathode trace, located in the non-display area, and the first cathode trace is electrically connected to the first cathode portion through a first connection line.

[0006] In a second aspect, based on the same inventive concept, embodiments of the present invention further provide a display device including the above display panel.

[0007] The technical solutions provided by the embodiments of the present invention have the following beneficial effects: In an embodiment of the present invention, the cathode layer is divided into a first cathode portion corresponding to the first display area and a second cathode portion corresponding to the second display area, and the two cathode portions are independent of each other. Among them, the first cathode portion is separately connected to a first cathode trace through a first connection line. In this way, after the signal pin provides the cathode signal to the end of the first cathode trace, the cathode signal is only transmitted from the left and right borders to the vicinity of the upper border, and then transmitted to the first cathode portion through the first connection line. This cathode signal does not need to flow through the second cathode portion, so the cathode signal on the first cathode portion will not be affected by the voltage drop of the signal on the second cathode portion, and the cathode voltage on the first cathode portion can reach a more negative value, thereby better meeting the brightness requirements of the first display area and improving the display uniformity of the display panel. Description of the Drawings

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0009] Figure 1 It is a schematic structural diagram of a display panel in the related art; Figure 2 It is a schematic structural diagram of a display panel provided by an embodiment of the present invention; Figure 3 It is another schematic structural diagram of a display panel provided by an embodiment of the present invention; Figure 4 It is a cross-sectional view of a display panel provided by an embodiment of the present invention; Figure 5 It is another schematic diagram of the film layer structure of a display panel provided by an embodiment of the present invention; Figure 6 It is still another schematic structural diagram of a display panel provided by an embodiment of the present invention; Figure 7 It is yet another schematic structural diagram of a display panel provided by an embodiment of the present invention; Figure 8 It is yet another schematic structural diagram of a display panel provided by an embodiment of the present invention; Figure 9 It is yet another schematic structural diagram of a display panel provided by an embodiment of the present invention; Figure 10 It is yet another schematic structural diagram of a display panel provided by an embodiment of the present invention; Figure 11 It is yet another schematic structural diagram of a display panel provided by an embodiment of the present invention; Figure 12 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 13 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 14 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 15 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 16 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 17 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 18 Another schematic diagram of the film layer structure of the display panel provided by the embodiment of the present invention; Figure 19 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 20 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 21 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 22 A top view of the conductive part provided by the embodiment of the present invention; Figure 23 Another schematic diagram of the film layer structure of the display panel provided by the embodiment of the present invention; Figure 24 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 25 Another schematic diagram of the film layer structure of the display panel provided by the embodiment of the present invention; Figure 26 Another schematic structural diagram of the display panel provided by the embodiment of the present invention; Figure 27 Another schematic diagram of the film layer structure of the display panel provided by the embodiment of the present invention; Figure 28 A schematic structural diagram of the display device provided by the embodiment of the present invention. Detailed implementation manners

[0010] In order to better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0011] It should be clear that the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0012] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0013] It should be understood that the term " / and" used herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0014] Before elaborating on the technical solutions provided by the embodiments of the present invention, the present invention first explains the problems existing in the related technologies.

[0015] In the related technologies, as Figure 1 shown, Figure 1 FIG. is a schematic structural diagram of a display panel in the related technology. The display panel includes a display area 101 and a non-display area 102. Among them, the display area 101 includes a first display area 103 and a second display area 104. An optical component such as a camera is correspondingly provided at the first display area 103, and the second display area 104 is a conventional display area surrounding the first display area 103.

[0016] The display panel further includes a cathode layer 105 and a cathode trace 106. The cathode layer 105 is a whole film layer covering the display area 101. The cathode trace 106 is located in the non-display area 102, and the cathode layer 105 is overlapped with the cathode trace 106 through an overlapping metal 107.

[0017] Currently, in order to further improve the transmittance of the first display area 103, generally, the density of the light-emitting elements in the first display area 103 is set to be less than the density of the light-emitting elements in the second display area 104. In this structure, in order to weaken the brightness difference between the first display area 103 and the second display area 104 and optimize the display uniformity of the entire display area 101, the light-emitting elements in the first display area 103 need to emit brighter light. At this time, the data voltage corresponding to the pixel circuit connected to the light-emitting elements in the first display area 103 needs to be lower, so that the pixel circuit can provide a larger output current, and the cathode voltage on the cathode layer 105 in the first display area 103 is also required to reach a lower level.

[0018] However, based on the above structure, the cathode signal received by the cathode layer 105 in the first display area 103 comes from the cathode layer 105 in the surrounding second display area 104. Coupled with the fact that the first display area 103 is often located at the top of the display area 101, this will cause a large voltage drop in the cathode signal on the cathode layer 105 in the first display area 103, making it difficult to meet the display requirements of the first display area 103.

[0019] For example, the current cathode voltage is negative, such as -3V. When the cathode signal on the cathode trace 106 is transmitted to the cathode layer 105 in the first display area 103 through the cathode layer 105 in the second display area 104, a large voltage drop will occur, resulting in the voltage of the cathode signal actually received by the cathode layer 105 in the first display area 103 not being as negative, such as becoming -2V. As a result, it is difficult for the cathode voltage corresponding to the first display area 103 to meet the brightness requirements of the light-emitting elements.

[0020] In response to this, the embodiment of the present invention provides a display panel. By adjusting the structure of the cathode layer, the cathode voltage corresponding to the first display area can meet its display requirements.

[0021] As Figure 2 shown, Figure 2 FIG. 13 is a schematic structural diagram of a display panel provided by an embodiment of the present invention. The display panel includes a display area 1 and a non-display area 2. Among them, the display area 1 includes a first display area 3 and a second display area 4 surrounding the first display area 3. The transmittance of at least part of the area in the first display area 3 is greater than that of the second display area 4.

[0022] In the embodiment of the present invention, optical components such as a camera are correspondingly arranged at the first display area 3. At least part of the area in the first display area 3 is a high-transmittance area. External ambient light enters the optical components below the screen through the high-transmittance area in the first display area 3, enabling the optical components to complete the acquisition of external light, and further enabling the display panel to implement functions such as camera shooting. The second display area 4 is a conventional display area surrounding the first display area 3.

[0023] In a more specific structure, referring to Figure 2 , the first display area 3 includes a first sub-display area 5 and a second sub-display area 6.

[0024] Among them, the first sub-display area 5 is a high-transmittance area, and the transmittance of the first sub-display area 5 is greater than that of the second display area 4. Moreover, the density of the light-emitting elements in the first sub-display area 5 can be less than the density of the light-emitting elements in the second display area 4.

[0025] The second sub-display area 6 is a transition area. To further improve the transmittance of the first sub-display area 5, the pixel circuits connected to the light-emitting elements in the first sub-display area 5 can be arranged in the second sub-display area 6. The relationship between the pixel circuits and the light-emitting elements in the second sub-display area 6 can be one-to-one, that is, one pixel circuit is only connected to one light-emitting element, or it can also be one-to-many, that is, one pixel circuit is connected to at least two light-emitting elements. Moreover, the density of the light-emitting elements in the second sub-display area 6 can be between the density of the light-emitting elements in the first sub-display area 5 and the density of the light-emitting elements in the second display area 4.

[0026] As Figure 3 and Figure 4 shown, Figure 3 This is another schematic structural diagram of the display panel provided by the embodiment of the present invention. Figure 4 This is a cross-sectional view of the display panel provided by the embodiment of the present invention. The display panel further includes a substrate 7, and the substrate 7 can be a rigid substrate such as glass or a flexible substrate such as polyimide.

[0027] The display panel further includes a light-emitting device layer 8, and the light-emitting device layer 8 includes a cathode layer 9. The cathode layer 9 includes a first cathode portion 10 and a second cathode portion 11. The first cathode portion 10 and the second cathode portion 11 are arranged in the same layer. The first cathode portion 10 is at least located in the first display area 3, and the second cathode portion 11 is located in the second display area 4. Moreover, there is a gap between the first cathode portion 10 and the second cathode portion 11.

[0028] Among them, the fact that there is a gap between the first cathode portion 10 and the second cathode portion 11 specifically means that the first cathode portion 10 and the second cathode portion 11 are not connected and are disconnected from each other.

[0029] The display panel further includes a first cathode trace 12. The first cathode trace 12 is located in the non-display area 2, and the first cathode trace 12 is electrically connected to the first cathode portion 10 through a first connection line 13. In the embodiment of the present invention, the first cathode trace 12 can be only used to provide a cathode signal to the first cathode portion 10, and the first cathode trace 12 is not connected to the second cathode portion 11.

[0030] In an embodiment of the present invention, the cathode layer 9 is divided into a first cathode portion 10 corresponding to the first display area 3 and a second cathode portion 11 corresponding to the second display area 4, and the two cathode portions are independent of each other. Among them, the first cathode portion 10 is separately connected to a first cathode trace 12 through a first connection line 13. In this way, after the signal pin provides the cathode signal to the end of the first cathode trace 12, the cathode signal is only transmitted from the left and right borders to the vicinity of the upper border, and then transmitted to the first cathode portion 10 through the first connection line 13. This cathode signal does not need to flow through the second cathode portion 11, so the cathode signal on the first cathode portion 10 will not be affected by the voltage drop of the signal on the second cathode portion 11, and the cathode voltage on the first cathode portion 10 can reach a more negative value, thus better meeting the brightness requirements of the first display area 3 and improving the display uniformity of the display panel.

[0031] In a feasible implementation manner, as Figure 5 shown, Figure 5 is another schematic diagram of the film layer structure of the display panel provided by the embodiment of the present invention. The display panel further includes an array layer 14, and the array layer 14 is located between the substrate 7 and the light-emitting device layer 8. The array layer 14 includes a first metal layer 15.

[0032] Among them, the first connection line 13 is located in the first metal layer 15.

[0033] The array layer 14 is a film layer in the display panel for setting various circuits and traces. The array layer 14 usually includes multiple metal layers. The first connection line 13 is located in the array layer 14, and the selection flexibility of the film layer position where the first connection line 13 is located is higher. For example, a new metal layer can be added to the array layer 14 as the first metal layer 15 to arrange the first connection line 13, or according to the wiring conditions of each metal layer in the array layer 14, an original metal layer can be used as the first metal layer 15 to arrange the first connection line 13.

[0034] Regarding the first metal layer 15, in a feasible implementation manner, see Figure 5 , the array layer 14 further includes a circuit layer 16, and the circuit layer 16 includes a transistor 17.

[0035] The first metal layer 15 is located between the substrate 7 and the circuit layer 16. The first metal layer 15 further includes a shielding portion 18. In the direction perpendicular to the plane where the substrate 7 is located, the shielding portion 18 overlaps with the channel of the transistor 17 to prevent external light from irradiating into the channel of the transistor 17, avoid affecting the carrier concentration of the transistor 17, and improve the device stability.

[0036] The above structure uses the original shielding metal layer for setting the shielding portion 18 in the array layer 14 as the first metal layer 15, so that there is no need to add other film layers for the first connection line 13. Correspondingly, there is no need to add other mask plates in the manufacturing process of the display panel, saving the manufacturing cost.

[0037] Moreover, compared with other metal layers, the wiring in the shielding metal layer is relatively simple, and there will be more space to accommodate the first connection line 13. The design of the arrangement direction and quantity of the first connection line 13 will be more flexible. In other words, when the first connection line 13 is located in the shielding metal layer, the influence of the first connection line 13 on the original other wirings in the array layer 14 can also be reduced.

[0038] In the embodiment of the present invention, referring to Figure 10 , when the first display area 3 includes a first sub-display area 5 and a second sub-display area 6, since the pixel circuit connected to the light-emitting element in the first sub-display area 5 is located in the second sub-display area 6, therefore, the shielding portion 18 in the first display area 3 can be only located in the second sub-display area 6, rather than in the first sub-display area 5. And, the shape, area, arrangement density, etc. of the shielding portion 18 in the second sub-display area 6 and the shape, area, arrangement density, etc. of the shielding portion 18 in the second display area 4 can be the same or different, and can be specifically adjusted according to the layout design of the pixel circuits in the two areas.

[0039] In a feasible implementation manner, as Figure 6 and Figure 7 shown, Figure 6 is another schematic structural diagram of the display panel provided by the embodiment of the present invention, Figure 7 is another schematic structural diagram of the display panel provided by the embodiment of the present invention, and, as Figure 8 and Figure 9 shown, Figure 8 is another schematic structural diagram of the display panel provided by the embodiment of the present invention, Figure 9 is another schematic structural diagram of the display panel provided by the embodiment of the present invention. The second display area 4 includes a first sub-area 20 and a second sub-area 21 located on opposite sides of the first display area 3. The first connection line 13 penetrates through the first sub-area 20, and the extending direction of the first connection line 13 is the same as the arrangement direction of the first sub-area 20 and the second sub-area 21.

[0040] The first metal layer 15 further includes a first signal line 19 for receiving a first constant voltage signal. The first signal line 19 includes a first trace 22 located in the first sub-area 20. The first trace 22 extends in the same direction as the first connection line 13, and at least part of the adjacent first traces 22 includes the first connection line 13.

[0041] Taking Figure 7Taking the example that the upper and lower sides of the first display area 3 shown include the first sub-area 20 and the second sub-area 21, the first connecting line 13 runs through the first sub-area 20, which means that the first cathode part 10 is connected to the first cathode wiring 12 on the upper side or the lower side through the first connecting line 13 extending longitudinally. When the first metal layer 15 also includes the first signal line 19 receiving the constant voltage signal, in order to match the arrangement of the first connecting line 13 in the first sub-area 20, the first signal line 19 in the first sub-area 20 can be designed to include a plurality of first wirings 22 extending longitudinally, and the first connecting line 13 is interspersed between the first wirings 22. In this way, the first wiring 22 in the first sub-area 20 and the first connecting line 13 extend in the same direction, and the two can be reasonably arranged. Figure 9 The left and right sides of the first display area 3 shown include a first sub-area 20 and a second sub-area 21 , which will not be described in detail here.

[0042] For further information, see Figure 5 The array layer 14 further includes a circuit layer 16, and the circuit layer 16 includes a transistor 17. The first metal layer 15 is located between the substrate 7 and the circuit layer 16, and the first metal layer 15 further includes a shielding portion 18, and the shielding portion 18 overlaps with the channel of the transistor 17 in a direction perpendicular to the plane where the substrate 7 is located.

[0043] like Figure 10 As shown, Figure 10 This is another structural schematic diagram of a display panel provided by an embodiment of the present invention, in which the first signal line 19 is connected to the shielding portion 18.

[0044] In this structure, the first metal layer 15 where the first connecting line 13 is located is a shielding metal layer, and the first signal line 19 is a signal line connected to the shielding part 18. The first signal line 19 transmits a constant voltage signal to the shielding part 18, which can prevent the shielding part 18 from floating, thereby preventing static electricity from accumulating on the shielding part 18.

[0045] When the first signal line 19 is a signal line connected to the shielding portion 18, the first signal line 19 generally has a grid-like structure that crosses horizontally and vertically. In the embodiment of the present invention, in order to achieve the rational wiring of the first signal line 19 and the first connecting line 13 in the first sub-area 20, the first signal line 19 originally in a grid shape in the first sub-area 20 is longitudinally separated, and then the first connecting line 13 is interspersed in the longitudinally separated position. However, in the area other than the first sub-area 20 in the second display area 4, the first signal line 19 can still have a grid-like structure.

[0046] In one possible implementation, see Figures 6 - 9, the non-display area 2 further includes a constant voltage line 23 electrically connected to the first signal line 19, and the constant voltage line 23 is used to provide a first constant voltage signal to the first signal line 19. To facilitate the first trace 22 in the first sub-region 20 to receive the first constant voltage signal, the first trace 22 can be connected to the constant voltage line 23 on the side of the first sub-region 20 away from the first display area 3. For example, the first trace 22 directly extends longitudinally to the upper border and is connected to the constant voltage line 23 within the upper border.

[0047] In an embodiment of the present invention, the above-mentioned constant voltage line 23 may include a power supply line for supplying a power signal to the pixel circuit, or may include a reset line for supplying a reset signal to the pixel circuit, etc.

[0048] In a feasible implementation manner, as Figure 11 and Figure 12 shown, Figure 11 is another structural schematic diagram of the display panel provided by the embodiment of the present invention, Figure 12 is another structural schematic diagram of the display panel provided by the embodiment of the present invention. The first signal line 19 further includes a second trace 24 located in the first display area 3 and a third trace 25 located at least in the second sub-region 21.

[0049] Among them, when the first display area 3 includes a first sub-display area 5 and a second sub-display area 6, the second trace 24 is only located in the second sub-display area 6 and not in the first sub-display area 5, so as to avoid blocking light in the first sub-display area 5.

[0050] The first metal layer 15 further includes a second connection line 26, and the second connection line 26 extends at least along the edge of the first display area 3 close to the second sub-region 21. And at least part of the second trace 24 is connected to the third trace 25 through the second connection line 26.

[0051] In the above setting method, at least part of the second trace 24 can directly extend to the second connection line 26, and its end is connected to the second connection line 26, and then a connection with the third trace 25 is established through the second connection line 26 to receive the first constant voltage signal transmitted by the third trace 25. Exemplarily, refer to Figure 11 , when the first sub-region 20 and the second sub-region 21 are located on the upper and lower sides of the first display area 3, the second traces 24 located on the left and right sides of the first sub-display area 5 in the first display area 3 are directly connected to the second connection line 26 at the lower end.

[0052] This design can make the wiring method of the second trace 24 and the third trace 25 more flexible. For example, still taking Figure 11For example, the second trace 24 extends longitudinally, and the third trace 25 is in a grid shape. When at least a part of the second trace 24 is connected to the third trace 25 through the second connection line 26, whether the longitudinally extending parts of the second trace 24 and the third trace 25 are aligned or not, it does not affect the connection between the second trace 24 and the third trace 25. Further, when the first signal line 19 is a signal line connected to the shielding part 18, the arrangement of the second trace 24 is more flexible, which means that the design of the shielding part 18 and the pixel circuit in the first display area 3 will be more free.

[0053] In an embodiment of the present invention, to improve the connection reliability, the line width of the second connection line 26 can be greater than the line widths of the second trace 24 and the third trace 25. Moreover, in an embodiment of the present invention, when the second connection line 26 extends at least along the edge of the first display area 3 close to the second sub-area 21, the second connection line 26 can be Figure 11 and Figure 12 in the stepped shape as shown, or can also be in a smooth arc shape.

[0054] In a feasible implementation manner, as Figure 13 and Figure 14 shown, Figure 13 is another schematic structural diagram of the display panel provided by the embodiment of the present invention. Figure 14 is another schematic structural diagram of the display panel provided by the embodiment of the present invention. In the direction perpendicular to the plane where the substrate 7 is located, the projection of the second connection line 26 surrounds the projection of the first cathode part 10, that is, the second connection line 26 is located outside the first cathode part 10.

[0055] The first display area 3 includes a first sub-display area 5 and a second sub-display area 6 surrounding the first sub-display area 5. The transmittance of the first sub-display area 5 is greater than the transmittance of the second display area 4. The second trace 24 is located in the second sub-display area 6, wherein the second trace 24 includes a plurality of first sub-traces 27 extending in the same direction.

[0056] Among them, the first sub-trace 27 includes a first type of first sub-trace 28, and the end of the first type of first sub-trace 28 is connected to the second connection line 26.

[0057] The first sub-trace 27 further includes a second type of first sub-trace 29. At least a part of the second type of first sub-trace 29 is located between the first sub-display area 5 and the first sub-area 20. Among them, referring to Figure 13 , the end of at least one second type of first sub-trace 29 is connected to the first trace 22, and / or, referring to Figure 14, at least one first sub-trace 29 of the second type is electrically connected to the first trace 22 or the first sub-trace 28 of the first type through a third connecting line 30, wherein the third connecting line 30 is located on the first metal layer 15, and the extending direction of the third connecting line 30 intersects with the extending direction of the first sub-trace 27.

[0058] In the embodiment of the present invention, when the first sub-trace 29 of the second type is electrically connected to the first trace 22 through the third connecting line 30, it may include at least the following two cases.

[0059] In the first case, at least one first sub-trace 29 of the second type is directly connected to the first trace 22 through the third connecting line 30. That is, a certain first sub-trace 29 of the second type is directly connected to the third connecting line 30, and the third connecting line 30 is directly connected to the first trace 22.

[0060] In the second case, at least one first sub-trace 29 of the second type is indirectly connected to the first trace 22 through the third connecting line 30. For example, a certain first sub-trace 29 of the second type is connected to the third connecting line 30, and the third connecting line 30 is indirectly connected to the first trace 22 through another first sub-trace 29 of the second type and another third connecting line 30.

[0061] Similarly, the first sub-trace 29 of the second type is electrically connected to the first sub-trace 28 of the first type through the third connecting line 30, which will not be elaborated here.

[0062] In the above structure, the second connecting line 26 is located on the periphery of the first cathode portion 10. To avoid short-circuiting between the second connecting line 26 and the first connecting line 13, the second connecting line 26 only surrounds a part of the edge of the first cathode portion 10.

[0063] Taking Figure 13 the first sub-region 20 shown in the figure is located above the first display region 3 as an example. Furthermore, this part of the first sub-trace 27 on the left and right sides of the first sub-display region 5 in the first display region 3 can be directly connected to the second connecting line 26, and this part of the first sub-trace 27 can be used as the first sub-trace 28 of the first type mentioned above. This part of the first sub-trace 27 between the first sub-display region 5 and the first sub-region 20 in the first display region 3 is not convenient to be directly connected to the second connecting line 26. Therefore, it can be set to be directly connected to the first trace 22, or connected to the first trace 22 or the first sub-trace 28 of the first type through the third connecting line 30. This part of the first sub-trace 27 can be used as the first sub-trace 29 of the second type mentioned above. Such a setting can facilitate the first sub-trace 27 in the first display region 3 to receive the first constant voltage signal.

[0064] Or, in another feasible embodiment, as Figure 15 shown in the figure, Figure 15Another schematic structural diagram of the display panel provided by the embodiment of the present invention. In the direction perpendicular to the plane where the substrate 7 is located, the projection of the second connection line 26 is located within the projection of the first cathode portion 10. The second connection line 26 extends along the edge of the first cathode portion 10 and has a closed structure, and all the second trace lines 24 are connected to the second connection line 26.

[0065] Taking the case where the first sub-region 20 and the second sub-region 21 are arranged longitudinally as an example, in the above structure, the projection of the second connection line 26 is located within the projection of the first cathode portion 10. The second connection line 26 can avoid the first trace line 22 and the first connection line 13, and thus has a closed structure extending along the edge of the first cathode portion 10. In this structure, all the second trace lines 24 can be connected to the second connection line 26, and the connection is more convenient.

[0066] In a feasible implementation manner, as Figure 16 and Figure 17 shown, Figure 16 Another schematic structural diagram of the display panel provided by the embodiment of the present invention, Figure 17 Another schematic structural diagram of the display panel provided by the embodiment of the present invention. The circuit layer 16 includes data lines 31, and the data lines 31 extend along the first direction x.

[0067] On the opposite sides of the first display region 3 in the first direction x, there are a first sub-region 20 and a second sub-region 21, and / or, on the opposite sides of the first display region 3 in the second direction y, there are a first sub-region 20 and a second sub-region 21. The second direction y intersects with the first direction x.

[0068] When the upper and lower sides of the first display region 3 include the first sub-region 20 and the second sub-region 21, the first cathode portion 10 is connected to the first cathode trace line 12 through the first connection line 13 on the upper or lower side of the first display region 3; when the left and right sides of the first display region 3 include the first sub-region 20 and the second sub-region 21, the first cathode portion 10 is connected to the first cathode trace line 12 through the first connection line 13 on the left or right side of the first display region 3.

[0069] In the embodiment of the present invention, the first display region 3 can include the first sub-region 20 and the second sub-region 21 only on the two sides in the first direction x, or can include the first sub-region 20 and the second sub-region 21 only on the two sides in the second direction y, or can include the first sub-region 20 and the second sub-region 21 on the two sides in the first direction x and also include the first sub-region 20 and the second sub-region 21 on the two sides in the second direction y.

[0070] In a feasible implementation manner, refer to Figure 16 and Figure 17, the second display area 4 includes a first sub-area 20 and a second sub-area 21 located on opposite sides of the first display area 3, and the first connection line 13 passes through the first sub-area 20. Among them, the distance between the first display area 3 and the outer edge of the display panel on one side of the first sub-area 20 is less than the distance between the first display area 3 and the outer edge of the display panel on one side of the second sub-area 21, so as to shorten the extension distance of the first connection line 13 and further reduce the voltage drop of the cathode signal received by the first cathode portion 10.

[0071] In a feasible implementation manner, as Figure 18 shown, Figure 18 is a schematic diagram of another film layer structure of the display panel provided by the embodiment of the present invention. The light-emitting device layer 8 further includes an anode 32, a pixel definition layer 33, a light-emitting layer 34, and a light-emitting functional layer 35. Among them, the light-emitting functional layer 35 includes film layers such as a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer.

[0072] The first cathode portion 10 is electrically connected to the first connection line 13 through at least one conductive portion 36. Among them, the conductive portion 36 includes a first conductive portion 37 provided on the same layer as the anode 32.

[0073] The light-emitting device layer 8 includes a first opening 38 that penetrates the pixel definition layer 33 and the light-emitting functional layer 35. The first opening 38 exposes the first conductive portion 37, and the first cathode portion 10 overlaps with the first conductive portion 37 at the first opening 38. Among them, the first opening 38 can be removed by laser.

[0074] When the first connection line 13 is located in the first metal layer 15 of the array layer 14, the first cathode portion 10 and the first connection line 13 are longitudinally spaced far apart, and at least one conductive portion 36 is used as an intermediate connecting metal between the two, which can improve the connection reliability between the two.

[0075] Among them, the first conductive portion 37 is provided on the same layer as the anode 32 and is the conductive portion 36 closest to the first cathode portion 10. By providing a first opening 38 that penetrates the pixel definition layer 33 and the light-emitting functional layer 35 in the light-emitting device layer 8, the first cathode portion 10 directly overlaps with the first conductive portion 37 within the first opening 38, which can increase the contact area between the first cathode portion 10 and the first conductive portion 37 and make the connection between the first cathode portion 10 and the first connection line 13 more stable.

[0076] In the embodiment of the present invention, to optimize the layout design, the shape of the first conductive portion 37 can be the same as the shape of the anode 32. For example, as Figure 19 shown, Figure 19 is a schematic diagram of another structure of the display panel provided by the embodiment of the present invention. When the anode 32 is circular, the first conductive portion 37 can also be circular.

[0077] Moreover, in the embodiments of the present invention, one or more first conductive parts 37 may be provided in one light-emitting repeating unit period according to the space.

[0078] For example, referring to Figure 19 , the display panel includes a plurality of light-emitting repeating units 60. The light-emitting repeating unit 60 includes a first light-emitting element group 40, a second light-emitting element group 41, a third light-emitting element group 42, and a fourth light-emitting element group 43 that are alternately arranged in sequence along the second direction y. Among them, the first light-emitting element group 40 and the third light-emitting element group 42 respectively include a red light-emitting element 39-R and a blue light-emitting element 39-B arranged along the first direction x, and the red light-emitting element 39-R in the first light-emitting element group 40 and the blue light-emitting element 39-B in the third light-emitting element group 42 are aligned. The second light-emitting element group 41 and the fourth light-emitting element group 43 respectively include green light-emitting elements 39-G arranged along the first direction x, and the green light-emitting element 39-G in the second light-emitting element group 41 and the green light-emitting element 39-G in the fourth light-emitting element group 43 are aligned.

[0079] In a feasible implementation manner, the first conductive part 37 is located between the anodes 32 of the red light-emitting element 39-R and the blue light-emitting element 39-B in the first light-emitting element group 40 of the light-emitting repeating unit 60, or between the anodes 32 of the two green light-emitting elements 39-G in the second light-emitting element group 41 of the light-emitting repeating unit 60, or between the anodes 32 of the blue light-emitting element 39-B and the red light-emitting element 39-R in the third light-emitting element group 42 of the light-emitting repeating unit 60, or between the anodes 32 of the two green light-emitting elements 39-G in the fourth light-emitting element group 43 of the light-emitting repeating unit 60.

[0080] In a feasible implementation manner, in combination with Figure 18 , as Figure 20 and Figure 21 shown, Figure 20 is another structural schematic diagram of the display panel provided by the embodiments of the present invention. Figure 21 is another structural schematic diagram of the display panel provided by the embodiments of the present invention. The first cathode part 10 is electrically connected to the first connection line 13 through at least one conductive part 36. The conductive part 36 includes a first conductive part 37 closest to the first cathode part 10, and this first conductive part 37 may be the conductive part 36 provided on the same layer as the anode 32 described above.

[0081] Among them, at least two first connection lines 13 are connected and communicated to the same first conductive part 37. The drawings in the embodiments of the present invention are all schematically shown with two first connection lines 13 connected to the same first conductive part 37. In other cases, three or more first connection lines 13 may also be connected to the same first conductive part 37.

[0082] Compared with the case where a first conductive part 37 is provided for each first connection line 13, the above structure can reduce the number of the first conductive parts 37 and vias, saving the overlapping space between the first cathode part 10 and the first connection line 13.

[0083] In a feasible implementation manner, referring again to Figure 20 and Figure 21 , the first cathode part 10 is electrically connected to the first connection line 13 through at least one conductive part 36. The conductive part 36 includes a first conductive part 37 closest to the first cathode part 10, and the first conductive part 37 can be the conductive part 36 provided on the same layer as the anode 32 described above.

[0084] To optimize the arrangement of the first conductive parts 37, a plurality of first conductive parts 37 can be arranged along the edge of the first display area 3. For example, the connection line of the plurality of first conductive parts 37 can be in an arc shape.

[0085] In a feasible implementation manner, combining Figure 18 and Figure 22 , Figure 22 is a top view of a conductive part 36 provided by an embodiment of the present invention. The first cathode part 10 is electrically connected to the first connection line 13 through a plurality of stacked conductive parts 36, and adjacent conductive parts 36 are electrically connected through a first via 44.

[0086] Among them, the two first vias 44 corresponding to adjacent three conductive parts 36 do not overlap in the direction perpendicular to the plane of the substrate 7. Among the three first vias 44 corresponding to adjacent four conductive parts 36, two of the first vias 44 overlap in the direction perpendicular to the plane of the substrate 7.

[0087] It should be noted that the two first vias 44 corresponding to adjacent three conductive parts 36 refer to the first via 44 between the first conductive part 36 and the second conductive part 36, and the first via 44 between the second conductive part 36 and the third conductive part 36. The three first vias 44 corresponding to adjacent four conductive parts 36 refer to the first via 44 between the first conductive part 36 and the second conductive part 36, the first via 44 between the second conductive part 36 and the third conductive part 36, and the first via 44 between the third conductive part 36 and the fourth conductive part 36.

[0088] In the above setting method, on the one hand, the layout space occupied by the vias between a plurality of conductive parts 36 can be saved, and on the other hand, the connection between the conductive parts 36 can be made more stable, enhancing the bearing capacity and anti-deformation ability of the whole structure, improving the connection strength between the first cathode part 10 and the first connection line 13, and more evenly dispersing the stress between the two metal layers to avoid stress concentration.

[0089] In a feasible implementation manner, as Figure 23 shown, Figure 23 This is another schematic diagram of the film layer structure of the display panel provided by the embodiment of the present invention. The first cathode part 10 is electrically connected to the first connection line 13 through at least one conductive part 36.

[0090] The conductive part 36 includes a second conductive part 45. The second conductive part 45 is electrically connected to the first connection line 13 through a through second via hole 46 and a third via hole 47. Among them, the third via hole 47 is located on the side of the second via hole 46 away from the substrate 7, and the area of the orthographic projection of the third via hole 47 on the substrate 7 is larger than the area of the orthographic projection of the second via hole 46 on the substrate 7.

[0091] The second conductive part 45 is the conductive part 36 closest to the first connection line 13. A sleeve hole design is adopted between the second conductive part 45 and the first connection line 13, and the upper hole (the second via hole 46) has a larger aperture. The larger aperture of the upper hole enables more space to fill the connection material during connection, increasing the contact area and connection strength of the connection. The smaller aperture of the lower hole (the third via hole 47) can better control the connection depth and precision on the basis of ensuring the connection, making the connection between the second conductive part 45 and the first connection line 13 more stable and reliable, and reducing the risk of failure caused by loose connection.

[0092] Moreover, in the sleeve hole design with different apertures, the larger upper hole can buffer and disperse the stress generated by external forces to a certain extent, while the smaller lower hole can transfer the remaining stress more evenly to the underlying first connection line 13, avoiding stress concentration at a certain point or area, thereby improving the stability of the metal structure under stress and reducing the possibility of cracks or fractures.

[0093] In addition, referring again to Figure 23 , the conductive part 36 may further include a third conductive part 48, and the third conductive part 48 is located between the first conductive part 37 and the second conductive part 45. Among them, at least one third conductive part 48 includes a metal material, and / or at least one third conductive part 48 includes an Indium Tin Oxide (ITO) material.

[0094] In a feasible implementation manner, as Figure 24 and Figure 25 shown, Figure 24 This is another structural schematic diagram of the display panel provided by the embodiment of the present invention. Figure 25It is another schematic diagram of the film layer structure of the display panel provided by the embodiment of the present invention. The display panel further includes a blocking structure 49, and the blocking structure 49 is located between the first cathode portion 10 and the second cathode portion 11, and can be disposed around the first cathode portion 10, for example.

[0095] The blocking structure 49 is used to separate the first cathode portion 10 and the second cathode portion 11, ensure the isolation of the cathode signals between the first cathode portion 10 and the second cathode portion 11, and further ensure that the cathode signal received by the first cathode portion 10 does not flow through the second cathode portion 11, so that the cathode signal on the first cathode portion 10 has a smaller voltage drop.

[0096] In a feasible implementation manner, referring again to Figure 3 , the first cathode trace 12 surrounds the display area 1, so that no matter what position the first display area 3 is located in the display area 1, it is convenient for the first cathode portion 10 to lead out the first connection line 13 to be connected to the first cathode trace 12.

[0097] In the embodiment of the present invention, the first cathode trace 12 can be a single-layer metal or a stacked metal structure. For example, in order to make the first cathode trace 12 have a smaller load, the first cathode trace 12 can be a stacked metal structure of titanium-aluminum-titanium.

[0098] In a feasible implementation manner, the line width of the first cathode trace 12 is greater than or equal to 30 μm and less than or equal to 70 μm, so as to have a sufficient width and avoid an excessive load on the first cathode trace 12.

[0099] In a feasible implementation manner, as Figure 26 shown, Figure 26 It is another schematic diagram of the structure of the display panel provided by the embodiment of the present invention. The non-display area 2 further includes a second cathode trace 50, and the second cathode portion 11 is electrically connected to the second cathode trace 50. Among them, the second cathode trace 50 and the first cathode trace 12 can be disposed on the same layer or on different layers.

[0100] In the embodiment of the present invention, as Figure 27 shown, Figure 27 It is another schematic diagram of the film layer structure of the display panel provided by the embodiment of the present invention. The second cathode portion 11 is connected to the second cathode portion 11 through at least one overlapping metal 51, and at least one of the at least one overlapping metals 51 can be on the same layer as at least one of the conductive portions 36.

[0101] In the direction perpendicular to the plane of the substrate 7, the projection of the first cathode trace 12 is located on the side of the projection of the second cathode trace 50 away from the display area 1.

[0102] Compared with the first display area 3, the second display area 4 has a larger area, and the number of light-emitting elements provided therein is larger, which has a greater impact on the display effect. Therefore, by choosing to set the second cathode trace 50 closer to the display area 1, it is also possible to reduce the voltage drop of the cathode signal received by the second cathode portion 11 while taking this into account.

[0103] Based on the same inventive concept, an embodiment of the present invention further provides a display device, as Figure 28 shown Figure 28 is a schematic structural diagram of the display device provided by the embodiment of the present invention. The display device includes the above-mentioned display panel 100. Of course, Figure 28 the display device shown is only for illustrative purposes. The display device may be any electronic device having a display function, such as a mobile phone, a tablet computer, a laptop computer, an e-reader, or a television.

[0104] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

[0105] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that: include: A display area and a non-display area, wherein the display area includes a first display area and a second display area surrounding the first display area, and the transmittance of at least a part of the first display area is greater than the transmittance of the second display area; substrate; a light emitting device layer, comprising a cathode layer, the cathode layer comprising at least a first cathode portion located in the first display area and a second cathode portion located in the second display area, wherein a gap is provided between the first cathode portion and the second cathode portion; The first cathode wiring is located in the non-display area, and the first cathode wiring is electrically connected to the first cathode part through a first connecting line.

2. The display panel according to claim 1, characterized in that: The display panel further comprises an array layer, the array layer is located between the substrate and the light emitting device layer, and the array layer comprises a first metal layer; The first connecting line is located in the first metal layer.

3. The display panel according to claim 2, characterized in that: The array layer further comprises a circuit layer, and the circuit layer comprises transistors; The first metal layer is located between the substrate and the circuit layer. The first metal layer further includes a shielding portion. In a direction perpendicular to a plane where the substrate is located, the shielding portion overlaps with a channel of the transistor.

4. The display panel according to claim 2, characterized in that: The first metal layer further includes a first signal line for receiving a first constant voltage signal; The second display area includes a first sub-area and a second sub-area located at two opposite sides of the first display area, the first connection line runs through the first sub-area, and an extending direction of the first connection line is the same as an arrangement direction of the first sub-area and the second sub-area; The first signal line includes a first routing line located in the first sub-area, the first routing line and the first connecting line extend in the same direction, and at least part of the first adjacent routing lines includes the first connecting line.

5. The display panel according to claim 4, characterized in that: The array layer further comprises a circuit layer, and the circuit layer comprises transistors; The first metal layer is located between the substrate and the circuit layer, and the first metal layer further includes a shielding portion, and in a direction perpendicular to a plane where the substrate is located, the shielding portion overlaps with a channel of the transistor; Wherein, the first signal line is connected to the shielding portion.

6. The display panel according to claim 4, characterized in that: The non-display area further includes a constant voltage line electrically connected to the first signal line, and the first wiring is connected to the constant voltage line at a side of the first sub-area away from the first display area.

7. The display panel according to claim 4, characterized in that: The first signal line further includes a second line located in the first display area and a third line located at least in the second sub-area; The first metal layer further includes a second connecting line, which extends at least along an edge of the first display area on a side close to the second sub-area, and at least part of the second wiring is connected to the third wiring through the second connecting line.

8. The display panel according to claim 7, characterized in that: In a direction perpendicular to the plane where the substrate is located, the projection of the second connecting line surrounds the projection of the first cathode part; The first display area includes a first sub-display area and a second sub-display area surrounding the first sub-display area, and the transmittance of the first sub-display area is greater than the transmittance of the second display area; The second routing line is located in the second sub-display area, wherein the second routing line includes a plurality of first sub-routing lines extending in the same direction; Wherein, the first sub-routing includes a first type of first sub-routing and a second type of first sub-routing; The end of the first sub-wire of the first type is connected to the second connecting wire; At least part of the second-type first sub-routing is located between the first sub-display area and the first sub-area, wherein an end of at least one of the second-type first sub-routing is connected to the first routing, and / or at least one of the second-type first sub-routing is electrically connected to the first routing or the first-type first sub-routing through a third connecting line, wherein the third connecting line is located in the first metal layer, and an extension direction of the third connecting line intersects with an extension direction of the first sub-routing.

9. The display panel according to claim 7, characterized in that: In a direction perpendicular to the plane of the substrate, the projection of the second connecting line is located within the projection of the first cathode part, the second connecting line extends along the edge of the first cathode part and has a closed structure, and the second wirings are all connected to the second connecting line.

10. The display panel according to claim 4, characterized in that: The array layer further comprises a circuit layer, the circuit layer comprises data lines, and the data lines extend along a first direction; The opposite side of the first display area in the first direction includes the first sub-area and the second sub-area, and / or the opposite side of the first display area in the second direction includes the first sub-area and the second sub-area, and the second direction intersects with the first direction.

11. The display panel according to claim 1, characterized in that: The second display area includes a first sub-area and a second sub-area located at two opposite sides of the first display area, and the first connecting line runs through the first sub-area; The distance between the first display area on one side of the first sub-area and the outer edge of the display panel is smaller than the distance between the first display area on one side of the second sub-area and the outer edge of the display panel.

12. The display panel according to claim 1, characterized in that: The light emitting device layer further comprises an anode, a pixel definition layer, a light emitting layer and a light emitting functional layer; The first cathode part is electrically connected to the first connecting line through at least one conductive part, the conductive part includes a first conductive part arranged in the same layer as the anode, the light-emitting device layer includes a first opening that passes through the pixel definition layer and the light-emitting function layer, the first opening exposes the first conductive part, and the first cathode part overlaps the first conductive part at the first opening.

13. The display panel according to claim 1, characterized in that: The first cathode portion is electrically connected to the first connection line through at least one conductive part, and the conductive part includes a first conductive part closest to the first cathode portion, wherein at least two of the first connection lines are connected to the same first conductive part.

14. The display panel according to claim 1, characterized in that: The first cathode portion is electrically connected to the first connection line through at least one conductive portion, the conductive portion includes a first conductive portion closest to the first cathode portion, and a plurality of the first conductive portions are arranged along an edge of the first display area.

15. The display panel according to claim 1, characterized in that: The first cathode portion is electrically connected to the first connection line through a plurality of stacked conductive parts, and adjacent conductive parts are electrically connected through first vias; Among them, two of the first vias corresponding to three adjacent conductive parts do not overlap in a direction perpendicular to the plane where the substrate is located, and among the three first vias corresponding to four adjacent conductive parts, two of the first vias overlap in a direction perpendicular to the plane where the substrate is located.

16. The display panel according to claim 1, characterized in that: The first cathode portion is electrically connected to the first connection line through at least one conductive portion, the conductive portion includes a second conductive portion, and the second conductive portion is electrically connected to the first connection line through a second via hole and a third via hole; The third via hole is located on a side of the second via hole away from the substrate, and an area of ​​an orthographic projection of the third via hole on the substrate is larger than an area of ​​an orthographic projection of the second via hole on the substrate.

17. The display panel according to claim 1, characterized in that: The display panel further includes a blocking structure located between the first cathode portion and the second cathode portion.

18. The display panel according to claim 1, characterized in that: The first cathode wiring surrounds the display area.

19. The display panel according to claim 1, characterized in that: The line width of the first cathode wiring is greater than or equal to 30 μm and less than or equal to 70 μm.

20. The display panel according to claim 1, characterized in that: The non-display area further includes a second cathode wiring, and the second cathode portion is electrically connected to the second cathode wiring; In a direction perpendicular to the plane where the substrate is located, the projection of the first cathode wiring is located on a side of the projection of the second cathode wiring away from the display area.

21. A display device, characterized in that: Comprising a display panel as described in any one of claims 1 to 20.

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