Display panel and display device

Abstract

The present invention provides a display panel and a display device. The display panel includes: a substrate substrate, the substrate substrate is divided into a first display area, a second display area and a third display area, the second display area is located between the first display area and the third display area, and the first display area is arranged corresponding to the under-screen camera; a plurality of first light-emitting devices, the plurality of first light-emitting devices are located in the first display area of ​​the substrate substrate; a plurality of first pixel circuits, the plurality of first pixel circuits are located in the second display area of ​​the substrate substrate; a second pixel circuit distributed in an array, the second pixel circuit is located in the third display area, a connecting line, the connecting line is located on the side of the first pixel circuit away from the substrate substrate, and is used to electrically connect the first pixel circuit and the first light-emitting device; a compensation line, the compensation line is located in the third display area. Therefore, by setting the compensation line, the uniformity of the display effect of the display panel can be effectively improved.

Description

Technical Field

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

[0002] Compared with traditional liquid crystal displays (LCDs), organic light-emitting diodes (OLEDs) have the advantages of self-luminescence, wide color gamut, high contrast, and thinness. At the same time, organic light-emitting diodes are also widely used in flexible wearable fields such as smartphones. Due to its ultra-high screen-to-body ratio and better user experience, it has gradually become the mainstream form of mobile phones. With the continuous advancement of technology, under-screen cameras are one of the development trends of full-screen phones in the future. However, the display device of the under-screen camera still has many problems that need to be improved. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, one object of the present invention is to provide a display panel, which, when used in a display device of an under-screen camera, can effectively improve the uniformity of the display effect of the display panel or ensure good transmittance of the display panel.

[0004] In one aspect of the present invention, the present invention provides a display panel. According to an embodiment of the present invention, the display panel includes: a substrate, the substrate is divided into a first display area, a second display area and a third display area, the second display area is located between the first display area and the third display area, and the first display area is arranged corresponding to the under-screen camera; a plurality of first light-emitting devices, the plurality of first light-emitting devices are located in the first display area of ​​the substrate; a plurality of first pixel circuits, the plurality of first pixel circuits are located in the second display area of ​​the substrate; a second pixel circuit distributed in an array, the second pixel circuit is located in the third display area, a connecting line, the connecting line is located on the side of the first pixel circuit away from the substrate, and is used to electrically connect the first pixel circuit and the first light-emitting device; a compensation line, the compensation line is located in the third display area. Therefore, by setting the compensation line, the uniformity of the display effect of the display panel can be effectively improved.

[0005] According to an embodiment of the present invention, the display panel also includes: a first insulating layer, which is located between the first pixel circuit and the first light-emitting device; and a second insulating layer, which is located between the first insulating layer and the first light-emitting device, wherein the connecting line is located between the first insulating layer and the second insulating layer, and the connecting line is electrically connected to the first pixel circuit through a first via hole penetrating the first insulating layer, and is electrically connected to the first light-emitting device through a second via hole penetrating the second insulating layer.

[0006] According to an embodiment of the present invention, the line width of the compensation line is 20-30 micrometers.

[0007] According to an embodiment of the present invention, the compensation line is disposed in the same layer as the connection line, or the compensation line is disposed in the same layer as a source-drain electrode layer in the second pixel circuit.

[0008] According to an embodiment of the present invention, at least two rows or two columns of the second pixel circuits are arranged between two adjacent compensation lines.

[0009] According to an embodiment of the present invention, at least one of the compensation lines includes a plurality of sub-compensation lines arranged at intervals.

[0010] According to an embodiment of the present invention, one compensation line is arranged between the second pixel circuits in two adjacent rows or columns.

[0011] According to an embodiment of the present invention, the spacing between adjacent sub-compensation lines is 5-10 microns.

[0012] According to an embodiment of the present invention, the compensation line has a hole, and an orthographic projection of the hole on the base substrate has no overlapping area with an orthographic projection of a metal layer in the second pixel circuit on the base substrate.

[0013] According to an embodiment of the present invention, the metal layer is at least one of a gate electrode layer, a source-drain electrode layer, and an electrode layer of a storage capacitor of the second pixel circuit.

[0014] In another aspect of the present invention, the present invention provides a display device. According to an embodiment of the present invention, the display device includes the display panel and the under-screen camera described above, and the orthographic projection of the under-screen camera on the display panel has an overlapping area with the first display area. Therefore, the display effect of the display device is better, and those skilled in the art can understand that the display device has all the features and advantages of the display panel described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 is a plan view of a display panel in one embodiment of the present invention;

[0017] Figure 2 is a plan view schematically showing a display panel in another embodiment of the present invention;

[0018] Figure 3 is a structural schematic diagram of a display panel in another embodiment of the present invention;

[0019] Figure 4 is a structural schematic diagram of a display panel in another embodiment of the present invention;

[0020] Figure 5 is a schematic diagram of the structural position relationship between a second pixel circuit and a compensation line in a display panel in an embodiment;

[0021] Figure 6 is a schematic diagram of the structural position relationship between a second pixel circuit and a compensation line in a display panel in an embodiment;

[0022] Figure 7 is a schematic diagram of the structural position relationship between a second pixel circuit and a compensation line in a display panel in an embodiment;

[0023] Figure 8 is a schematic diagram of the structural position relationship between a second pixel circuit and a compensation line in a display panel in an embodiment;

[0024] Fig. 9 is a structural schematic diagram of a display panel in another embodiment of the present invention;

[0025] Fig.10 It is a schematic structural diagram of a display device in another embodiment of the present invention. DETAILED DESCRIPTION

[0026] The scheme of the present invention will be explained below in conjunction with embodiments. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. Where specific techniques or conditions are not indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are followed.

[0027] In one aspect of the present invention, the present invention provides a display panel. According to an embodiment of the present invention, referring to Figure 1 and Figure 2 The display panel includes: a base substrate 10, the base substrate 10 is divided into a first display area 11, a second display area 12 and a third display area 13, the second display area 12 is located between the first display area 11 and the third display area 13, and the first display area 11 is arranged in correspondence with the under-screen camera. It should be noted that the first display area 11 is arranged in correspondence with the under-screen camera, which means that the first display area and the area of ​​the orthographic projection of the under-screen camera on the back of the display panel have an overlapping area. In some specific embodiments, such as Figure 2 As shown in (A) in FIG. 1 , the first display area 11 overlaps with the orthographic projection A of the under-screen camera on the display panel; in other embodiments, as shown in FIG. Figure 2 As shown in (B) in FIG. 1 , the first display area 11 is covered by the orthographic projection A of the under-screen camera on the display panel; in some other embodiments, as shown in FIG. Figure 2As shown in (C) in FIG. 1 , the orthographic projection A of the under-screen camera on the display panel is covered by the first display area 11 (as shown in FIG. Figure 1 The under-screen functional area refers to the area corresponding to the under-screen functional layer, that is, the back of the display panel corresponding to the under-screen functional area is used to place the under-screen functional layer (such as the under-screen camera). Since the first display area has a high light transmittance aperture ratio, it can meet the under-screen camera's requirements for light intake, while greatly improving the screen-to-body ratio of the display panel.

[0028] According to an embodiment of the present invention, referring to Figure 1 and Figure 2 , the second display area 12 is arranged at the outer edge of the first display area 11, that is, the second display area 12 is arranged outside the first display area 11, or the second display area 12 is arranged around the first display area 11. In addition, there is no special requirement for the specific setting position of the first display area a, and those skilled in the art can flexibly select it according to the actual design requirements of the under-screen functional area. For example, the second display area can be the center of the display panel, or a corner of the display panel, or Figure 1 The image is shown located near the border and centered on the display panel.

[0029] Moreover, there are no special requirements for the specific shape of the first display area 11. Technical personnel in this field can flexibly select according to the actual situation such as the specific shape of the under-screen camera. For example, the shape of the first display area 11 includes but is not limited to a circle, an ellipse, a quadrilateral, a pentagon, a hexagon or other polygonal or irregular shapes.

[0030] According to an embodiment of the present invention, referring to Figure 3 The display panel further includes: a plurality of first light emitting devices 41, the plurality of first light emitting devices 31 are located in the first display area 11 of the substrate 10; a plurality of first pixel circuits 21, the plurality of first pixel circuits 21 are located in the second display area 12 of the substrate; second pixel circuits 22 distributed in an array, the second pixel circuits 22 are located in the third display area 13, connecting lines 30, the connecting lines 30 are located on the side of the first pixel circuits 21 away from the substrate 10, and are used to electrically connect the first pixel circuits 21 and the first light emitting devices 41; and compensation lines 50, the compensation lines 50 are located in the third display area 13. Therefore, by setting the compensation lines 50, the uniformity of the display effect of the display panel can be effectively improved.

[0031] Among them, the connection line 30 is used to electrically connect the first pixel circuit 21 and the first light-emitting device 41, so that the first pixel circuit 21 drives the first light-emitting device 41 to emit light, that is, the first pixel circuit 21 that drives the first light-emitting device 41 in the first display area to emit light is located in the second display area 12, and is not arranged in the first display area, thereby greatly improving the light transmittance aperture ratio of the first display area 11 to ensure a good photo effect of the under-screen camera. However, the inventor found that the setting of the connection line will make the display effect of the second display area and the third display area uneven, thereby reducing the display quality of the entire display panel. To solve this technical problem, the inventor found that a compensation line can be set in the third display area, thereby effectively improving the uniformity of the display effect of the display panel.

[0032] According to an embodiment of the present invention, referring to Figure 3 The display panel further includes: a first insulating layer 63, the first insulating layer 63 is located between the first pixel circuit 21 and the first light emitting device 41; a second insulating layer 64, the second insulating layer 64 is located between the first insulating layer 63 and the first light emitting device 41, wherein the connecting wire 30 is located between the first insulating layer 63 and the second insulating layer 64, and the connecting wire is electrically connected to the first pixel circuit 21 through a first via hole 631 penetrating the first insulating layer 63, and is electrically connected to the first light emitting device 41 through a second via hole 641 penetrating the second insulating layer 64. Thus, the electrical connection between the first pixel circuit 21 and the first light emitting device 41 is easily achieved.

[0033] According to an embodiment of the present invention, referring to Figure 3 There is no special requirement for the specific structure of the first pixel circuit 21, and those skilled in the art can flexibly select it according to the actual situation. In some embodiments, the first pixel circuit 21 is a 7T1C circuit (i.e., seven transistors and one capacitor) structure, for example, including a driving transistor, a data writing transistor, a storage capacitor, a threshold compensation transistor, a first reset transistor, a second reset transistor, a first light emission control transistor, and a second light emission control transistor. There is no special requirement for the vertical structure of the first pixel circuit 11. In some embodiments, refer to Figure 3 The first pixel circuit 21 includes an active layer 211, a gate 212, a source-drain electrode 213 and other structures, wherein the active layer 211 is arranged on one side of the substrate 10, the gate insulating layer 61 covers the active layer 211, the gate 212 is arranged on the surface of the gate insulating layer 61 away from the substrate, the interlayer dielectric layer 62 is arranged on the side of the gate insulating layer 61 away from the substrate and covers the gate 212, and the source-drain electrode layer 213 is arranged on the side of the interlayer dielectric layer 62 away from the substrate, wherein the source-drain electrode 213 is electrically connected to the active layer through a via penetrating the gate insulating layer and the interlayer dielectric layer. Figure 3As shown, the electrical connection between the wiring 30 and the first pixel circuit 21 is achieved by electrically connecting the wiring 30 to the source-drain electrode 213 .

[0034] Also, refer to Figure 3 The second pixel circuit 22 includes an active layer 221, a gate 222, a source-drain electrode layer 223 and other structures, wherein the active layer 221 is arranged on one side of the substrate 10, the gate insulating layer 61 covers the active layer 221, the gate 222 is arranged on the surface of the gate insulating layer 61 away from the substrate, the interlayer dielectric layer 62 is arranged on the side of the gate insulating layer 61 away from the substrate and covers the gate 222, and the source-drain electrode layer 223 is arranged on the side of the interlayer dielectric layer 62 away from the substrate, wherein the source-drain electrode layer 223 is electrically connected to the active layer through a via penetrating the gate insulating layer and the interlayer dielectric layer.

[0035] In addition, refer to Figure 3 The first light-emitting device 41 includes an anode 411, a light-emitting layer 412 and a cathode 413, wherein the anode 411 in the first light-emitting device is electrically connected to the connecting line 30 through a second via 641 that penetrates the second insulating layer 64. Furthermore, the first light-emitting device 41 may also include at least one of a hole transport layer, a hole injection layer, an electron transport layer and an electron injection layer. Those skilled in the art may flexibly select according to actual design requirements. The light-emitting unit corresponding to the second pixel circuit is provided with a light-emitting device ( Figure 3 (not shown), consistent with a normal light-emitting unit (i.e., including both a pixel circuit and a light-emitting device) to ensure normal display of the display panel. Figure 3 The display panel further includes a pixel defining layer 65, which is disposed on a surface of the second insulating layer 64 away from the base substrate and defines a plurality of openings, wherein all light emitting devices in the display panel are disposed in the openings.

[0036] It should be noted that those skilled in the art can choose whether to set a compensation line in the first display area according to actual needs. Since the compensation line is made of metal materials such as aluminum, silver, molybdenum, titanium, copper, and neodymium, the compensation line is opaque or has poor light transmittance. Therefore, if the first display area is required to have a high light transmittance aperture ratio, it is possible to choose not to set a compensation line in the first display area; if the display effect of the entire display panel is selected to have better uniformity, it is possible to choose to set a compensation line in the first display area. In addition, according to an embodiment of the present invention, the compensation line does not need to be electrically connected to other conductive layers or conductive lines, and its function is only to compensate for and improve the display uniformity problem of the display panel; of course, the compensation line can also be electrically connected to a conductive layer according to actual needs, so as to facilitate a more convenient connection method for the circuit, and at the same time ensure the effect of the compensation line in improving the display uniformity of the display panel.

[0037] According to an embodiment of the present invention, the line width of the compensation line is 20 to 30 microns, such as 20 microns, 22 microns, 24 microns, 25 microns, 26 microns, 28 microns or 30 microns. Therefore, the compensation line with the above width is similar to the width of the connection line, which can more effectively improve the actual uniformity of the display panel.

[0038] In some embodiments, Figure 3 As shown, the compensation line 50 and the connecting line 30 are arranged in the same layer, that is, the compensation line and the connecting line are prepared by the same process; in other embodiments, referring to Figure 4 The compensation line 50 is disposed in the same layer as the source-drain electrode layer 223 in the second pixel circuit 22. Thus, the uniformity of the display effect can be improved, and the compensation line and the connecting line or the source-drain electrode layer can be formed synchronously, thereby simplifying the process steps.

[0039] According to the embodiments of the present invention, the inventors found in the process of research that if compensation lines are set in each row or column of pixels, the light transmittance aperture ratio of the third display area will also be reduced, thereby affecting the display quality or affecting other sensing elements located in the third display area (such as fingerprint recognition sensing elements). Based on this technical problem, through a series of research, the inventors provide the following three solutions:

[0040] In some embodiments, reference Figure 6 , at least two rows or two columns of second pixel circuits 21 are arranged between two adjacent compensation lines 50. Thus, the number of compensation lines is appropriately reduced, so that the light transmittance aperture ratio of the display panel and the uniformity of the display effect can be ensured at the same time. In some specific embodiments, two rows of second pixel circuits 21 are arranged between two adjacent compensation lines 50, which is more convenient than the technical solution in which one compensation line is arranged for each row of second pixel circuits 21 (such as Figure 5 As shown), the technical solution of the present invention can increase the light transmission aperture ratio of the third display area of ​​the display panel from 14.82% to 15.13%.

[0041] In other embodiments, reference Figure 7 , at least one compensation line 50 includes a plurality of sub-compensation lines 51 arranged at intervals. Figure 5 In the technical solution, within the compensation line of the same length, the compensation line is arranged into a plurality of sub-compensation lines arranged at intervals, and the number of specific sub-compensation lines or the spacing between adjacent sub-compensation lines can be flexibly adjusted by those skilled in the art in combination with practical issues such as the uniformity of the actual effect and the light transmission aperture ratio of the display panel to obtain a suitable number of sub-compensation lines. In some specific embodiments, the spacing between adjacent sub-compensation lines is 5 to 10 microns. In some specific embodiments, such as Figure 7As shown, a compensation line is arranged between the second pixel circuits of two adjacent rows or columns, and the spacing between adjacent sub-compensation lines is 5 microns. In this way, it can be ensured that the display panel has good display uniformity and high light transmittance aperture ratio. According to the test results, compared with Figure 5 technical solutions, Figure 7 A technical solution in which a compensation line is arranged between the second pixel circuits of two adjacent rows or columns can increase the light transmission aperture ratio of the third display area of ​​the display panel from 14.82% to 15.09%.

[0042] In some other embodiments, reference Figure 8 and Fig. 9 , the compensation line 50 has a cavity 51, and the orthographic projection of the cavity 51 on the base substrate 10 has no overlapping area with the orthographic projection of the metal layer in the second pixel circuit 21 on the base substrate. The metal layer is at least one of the gate 222, the source-drain electrode layer 223, and the electrode layer of the storage capacitor of the second pixel circuit 21. Therefore, the position of the metal layer is not transparent, so at least part of the area corresponding to the compensation line and the correction of the metal layer is provided with a cavity, and the part of the compensation line corresponding to the metal layer is retained. In this way, the light transmission aperture ratio of the third display area can be increased, and the display uniformity can be effectively improved.

[0043] According to the embodiments of the present invention, those skilled in the art may also combine two or three of the above three technical solutions according to actual needs, as long as the opening transmittance and display uniformity of the display panel can be effectively guaranteed.

[0044] In another aspect of the present invention, the present invention provides a display device. According to an embodiment of the present invention, the display device includes the display panel 100 and the under-screen camera 200 described above, and the orthographic projection of the under-screen camera 200 on the display panel 100 has an overlapping area with the first display area 11. Therefore, the display effect of the display device is better, and those skilled in the art can understand that the display device has all the features and advantages of the display panel described above.

[0045] According to the embodiments of the present invention, there is no special requirement for the specific type of the display device, and those skilled in the art can flexibly select it according to actual needs. In some embodiments, the specific type of the display device includes but is not limited to mobile phones, notebooks, iPads, kindles, televisions, and other display devices with display and camera functions.

[0046] Those skilled in the art will understand that, in addition to the display panel described above, the display device also includes the necessary structures or components of a conventional display device. Taking a mobile phone as an example, in addition to the display panel described above, it also includes the necessary structures or components such as a glass cover, a battery back cover, a middle frame, a main board, a touch module, an audio module, and a camera module.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0048] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A display panel, characterized in that: include: A base substrate, wherein the base substrate is divided into a first display area, a second display area and a third display area, wherein the second display area is located between the first display area and the third display area, and the first display area is arranged corresponding to the under-screen camera; A plurality of first light emitting devices, wherein the plurality of first light emitting devices are located in the first display area of ​​the base substrate; A plurality of first pixel circuits, wherein the plurality of first pixel circuits are located in the second display area of ​​the base substrate; second pixel circuits distributed in an array, the second pixel circuits being located in the third display area, A connecting line, the connecting line is located at a side of the first pixel circuit away from the base substrate, and is used to electrically connect the first pixel circuit and the first light-emitting device; a compensation line, the compensation line being located in the third display area, The compensation line is arranged in the same layer as the connection line, or the compensation line is arranged in the same layer as the source-drain electrode layer in the second pixel circuit. The compensation line is formed of a metal material.

2. The display panel according to claim 1, characterized in that: Also includes: a first insulating layer, wherein the first insulating layer is located between the first pixel circuit and the first light emitting device; a second insulating layer, the second insulating layer being located between the first insulating layer and the first light emitting device, The connecting line is located between the first insulating layer and the second insulating layer, and is electrically connected to the first pixel circuit through a first via hole penetrating the first insulating layer, and is electrically connected to the first light-emitting device through a second via hole penetrating the second insulating layer.

3. The display panel according to claim 1 or 2, characterized in that: The line width of the compensation line is 1 to 20 microns.

4. The display panel according to claim 1, characterized in that: At least two rows or two columns of the second pixel circuits are arranged between two adjacent compensation lines.

5. The display panel according to claim 1 or 4, characterized in that: At least one of the compensation lines includes a plurality of sub-compensation lines arranged at intervals.

6. The display panel according to claim 5, characterized in that: One compensation line is arranged between the second pixel circuits in two adjacent rows or columns.

7. The display panel according to claim 5, characterized in that: The spacing between adjacent sub-compensation lines is 5-10 microns.

8. The display panel according to claim 1 or 4, characterized in that: The compensation line has a hole, and an orthographic projection of the hole on the base substrate has no overlapping area with an orthographic projection of a metal layer in the second pixel circuit on the base substrate.

9. The display panel according to claim 8, characterized in that: The metal layer is at least one of a gate electrode layer, a source-drain electrode layer, and an electrode layer of a storage capacitor of the second pixel circuit.

10. A display device, characterized in that: include: The display panel according to any one of claims 1 to 9; An under-screen camera, wherein the orthographic projection of the under-screen camera on the display panel has an overlapping area with the first display area.

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