Display panel and display device

Abstract

Embodiments of the present invention provide a display panel and a display device, relating to the field of display technology, for improving the positional stability of support pillars in a display panel and ensuring the mechanical strength of the display panel. The display panel includes: a substrate; an array layer located on one side of the substrate, the array layer including a pixel driving circuit and a plurality of signal lines electrically connected to the pixel driving circuit, the array layer including a first surface away from the substrate, the first surface including a first region and a second region, the flatness of the first surface located in the first region being greater than the flatness of the first surface located in the second region; a display layer located on a side of the array layer away from the substrate; the display layer including a light-emitting device electrically connected to the pixel driving circuit; a support pillar located on a side of the array layer away from the substrate; the orthographic projection of the support pillar on the plane of the display panel being located within the first region.

Description

[0001] This application is a divisional application with the application date of April 9, 2021, application number 202110384524.5, and invention name “Display panel and display device”.

Technical field

[0002] The present invention relates to the field of display technology, and in particular to a display panel and a display device. [Background Technology]

[0003] With the continuous advancement of display technology, consumers' demands for displays are constantly increasing. Currently, various display types, including LCDs and organic light-emitting diodes, are emerging one after another and experiencing rapid development. On this basis, display technologies such as 3D displays, touch displays, curved displays, ultra-high-resolution displays, and anti-peeping displays are constantly emerging.

[0004] However, based on the structure of existing display panels, the support columns in the display panel will be displaced or broken to varying degrees of damage when the display panel is subjected to external forces, which will cause poor display and affect the mechanical strength of the display panel. [Summary of the invention]

[0005] In view of this, embodiments of the present invention provide a display panel and a display device to improve the position stability of support columns in the display panel and ensure the display effect and mechanical strength of the display panel.

[0006] In one aspect, an embodiment of the present invention provides a display panel, including:

[0007] substrate;

[0008] an array layer located on one side of the substrate, the array layer comprising a pixel driving circuit and a plurality of signal lines electrically connected to the pixel driving circuit, the array layer comprising a first surface away from the substrate, the first surface comprising a first region and a second region, the flatness of the first surface in the first region being greater than or equal to the flatness of the first surface in the second region;

[0009] A display layer is located on a side of the array layer away from the substrate; the display layer includes a light-emitting device electrically connected to the pixel driving circuit;

[0010] A support column is located on a side of the array layer away from the substrate; an orthographic projection of the support column on the plane where the display panel is located is located within the first area.

[0011] Optionally, the pixel driving circuit includes a storage capacitor; the storage capacitor includes a first electrode and a second electrode arranged opposite to each other along the thickness direction of the display panel; the second electrode is located on a side of the first electrode away from the substrate;

[0012] The orthographic projection of the second electrode on the plane where the display panel is located is located in the first area; the second area at least partially surrounds the first area;

[0013] The supporting column includes a first supporting column, and the orthographic projection of the first supporting column on the plane where the display panel is located is located within the orthographic projection of the second electrode on the plane where the display panel is located.

[0014] Optionally, the signal line includes a power supply voltage signal line; the orthographic projection of the power supply voltage signal line on the plane where the display panel is located is located within the first area;

[0015] The supporting column includes a second supporting column, and the orthographic projection of the second supporting column on the plane where the display panel is located is located within the orthographic projection of the power supply voltage signal line on the plane where the display panel is located.

[0016] Optionally, the signal line further includes a scan line and a data line; the width of the power supply voltage signal line is greater than the width of the scan line; the width of the power supply voltage signal line is greater than the width of the data line.

[0017] Optionally, the array layer includes a plurality of stacked metal layers, and the power voltage signal line and the data line are located in different metal layers.

[0018] Optionally, the array layer includes a plurality of stacked metal layers, and the power supply voltage signal line and the data line are located in the same metal layer.

[0019] Optionally, the orthographic projection of the support column on the plane where the display panel is located does not overlap with the orthographic projection of the scanning line on the plane where the display panel is located;

[0020] The orthographic projection of the support column on the plane where the display panel is located does not overlap with the orthographic projection of the data line on the plane where the display panel is located.

[0021] Optionally, the display layer includes a pixel definition layer, the pixel definition layer includes a plurality of openings; the light emitting device includes a light emitting layer, and the light emitting layer is located in the openings;

[0022] The shortest distance between the support pillar and the opening is greater than or equal to 4 μm.

[0023] Optionally, the support pillars are formed in the pixel definition layer.

[0024] Optionally, the display panel includes a plurality of support columns, wherein at least some of the support columns are equidistant from a preset base point.

[0025] Optionally, the density of the support column is greater than or equal to 1.5%.

[0026] Optionally, the shape of the orthographic projection of the support column on the plane where the display panel is located includes any one of a polygon, an ellipse, and a circle.

[0027] On the other hand, an embodiment of the present invention provides a display device including the above-mentioned display panel.

[0028] The display panel and display device provided by the embodiments of the present invention set the support column to correspond to the first area, that is, the orthographic projection of the support column on the plane where the display panel is located is located within the first area. Because the flatness of the first surface in the first area is greater than or equal to the flatness of the first surface in the second area, after the support column is set to correspond to the first area with higher flatness, the positional stability of the support column can be improved, avoiding the problem of the support column being unstable or easily collapsed due to the unevenness of the bottom of the support column. Such a setting can ensure the stability of the support column. On the one hand, it can prevent the debris of the support column from affecting the light output of the light-emitting layer after the collapse of the support column, thereby ensuring the display effect of the display panel; on the other hand, it can also ensure that the display panel has high mechanical strength.

Brief Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic top view of a display panel provided by an embodiment of the present invention;

[0031] Figure 2 A schematic cross-sectional view of a display panel provided by an embodiment of the present invention;

[0032] Figure 3 A circuit diagram of a display unit in a display panel provided by an embodiment of the present invention;

[0033] Figure 4 for Figure 3 A wiring diagram of a pixel driving circuit shown in FIG.

[0034] Figure 5 A schematic top view of another display panel provided by an embodiment of the present invention;

[0035] Figure 6 A schematic top view of another display panel provided by an embodiment of the present invention;

[0036] Figure 7 for Figure 6 A schematic cross-sectional view of a fingerprint recognition area of ​​a display panel is shown;

[0037] Figure 8 A schematic diagram of a display device provided by an embodiment of the present invention. [Specific implementation method]

[0038] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] It should be understood that the embodiments described are only a portion of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0040] 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", "an", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0041] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0042] It should be understood that although the terms "first," "second," "third," etc. may be used to describe support pillars in embodiments of the present invention, the support pillars should not be limited to these terms. These terms are merely used to distinguish support pillars from one another. For example, a first support pillar may also be referred to as a second support pillar, and similarly, a second support pillar may also be referred to as a first support pillar without departing from the scope of embodiments of the present invention.

[0043] During implementation of the present invention, the inventors discovered that during reliability testing of display panels, dark spots and dark spots may occur. This failure is attributed to the poor flatness of the film layer beneath the support pillars of existing display panels. This allows the support pillars to easily shift and collapse when subjected to forces. The resulting debris from the collapsed support pillars affects the light output of the light-emitting devices and reduces the mechanical strength of the display panel.

[0044] In view of this, an embodiment of the present invention provides a display panel, such as Figure 1 、 Figure 2 and Figure 3 As shown, Figure 1 A schematic top view of a display panel provided by an embodiment of the present invention is shown. Figure 2 A cross-sectional schematic diagram of a display panel provided by an embodiment of the present invention, Figure 3 A circuit diagram of a display unit in a display panel provided by an embodiment of the present invention is provided. Figure 4 for Figure 3 1 is a wiring diagram of a pixel driving circuit, wherein the display panel includes a plurality of display units 10. The display unit 10 is located on one side of a substrate 1. The display unit 10 includes a light emitting device 11 and a pixel driving circuit 12 that are electrically connected.

[0045] like Figure 2 As shown, the display panel includes an array layer 2 and a display layer 3. Along the thickness direction of the display panel, the array layer 2 is located between the display layer 3 and the substrate 1. The pixel driving circuit 12 is provided in the array layer 2 of the display panel. The light emitting device 11 is provided in the display layer 3 of the display panel.

[0046] In the embodiment of the present invention, the pixel driving circuit 12 includes a storage capacitor 121 and at least two thin film transistors T. Figure 3 and Figure 4 In the figure, the pixel driving circuit 12 is designed as a 7T1C circuit including 7 thin film transistors and 1 storage capacitor. It can be understood that Figure 3 and Figure 4 The structure of the pixel driving circuit shown is only for illustration. In the embodiment of the present invention, the pixel driving circuit can also be designed in other forms. For example, the pixel driving circuit 12 can be designed as a 2T1C form including two thin film transistors and one storage capacitor, etc. The embodiment of the present invention does not limit the specific structure of the pixel driving circuit 12. Figure 2 The cross-sectional schematic diagram only shows one thin film transistor T connected to the light emitting device 11 for illustration.

[0047] In the embodiment of the present invention, the array layer 2 is further provided with a plurality of signal lines electrically connected to the pixel driving circuit. According to the specific configuration of the pixel driving circuit, there are also various specific configurations of the signal lines. Figure 3 Taking the pixel driving circuit shown in FIG. 1 as an example, the pixel driving circuit 12 includes a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6 and a seventh transistor T7. Figure 3 and Figure 4As shown, the signal lines include a power voltage signal line PVDD, a scan line, and a data line Data; illustratively, the scan lines include a first scan line S1, a second scan line S2, and a light-emission control signal line E. The control terminal of the first transistor T1 is electrically connected to the light-emission control signal line E, and the first terminal of the first transistor T1 is electrically connected to the power voltage signal line PVDD; the control terminal of the second transistor T2 is electrically connected to the second scan line S2, and the first terminal of the second transistor T2 is electrically connected to the data line Data; the control terminal of the fourth transistor T4 is electrically connected to the second scan line S2; the control terminal of the fifth transistor T5 is electrically connected to the first scan line S1; the control terminal of the sixth transistor T6 is electrically connected to the light-emission control signal line E; and the control terminal of the seventh transistor T7 is electrically connected to the second scan line S2.

[0048] In the embodiment of the present invention, the array layer 2 includes multiple sub-film layers. The different structures of the above-mentioned signal lines, thin film transistors in the pixel driving circuit and storage capacitors are formed by different sub-film layers in the array layer 2. Figure 2 As shown, the array layer 2 includes a buffer layer 201, a semiconductor layer 202, a first insulating layer 203, a first metal layer 204, a second insulating layer 205, a second metal layer 206, a third insulating layer 207, a third metal layer 208 and a passivation layer 209, which are stacked in sequence along the thickness direction of the display panel. Among them, the channel structure of the thin film transistor T is formed in the semiconductor layer 202. The gate of the thin film transistor T is formed in the first metal layer 204. The source and drain of the thin film transistor T are formed in the third metal layer 208. The above-mentioned signal lines including the power supply voltage signal line PVDD, the scan line and the data line Data, and the storage capacitor 121 can be arranged in at least two layers of the above-mentioned first metal layer 204, the second metal layer 206 and the third metal layer 208 according to different design requirements. As shown in FIG. Figure 2 As shown, the storage capacitor 121 includes a first electrode 1211 and a second electrode 1212 disposed opposite each other along the thickness direction of the display panel. The second electrode 1212 is located on a side of the first electrode 1211 away from the substrate 1. The first electrode 1211 is formed on the first metal layer 204, and the second electrode 1212 is formed on the second metal layer 206.

[0049] During the manufacturing process of the display panel, the above-mentioned multiple sub-film layers including the buffer layer 201, the semiconductor layer 202, the first insulating layer 203, the first metal layer 204, the second insulating layer 205, the second metal layer 206, the third insulating layer 207, the third metal layer 208, and the passivation layer 209 are sequentially formed. In addition, according to the characteristics of the structure to be formed in the sub-film layer, it is necessary to adopt a patterning process including exposure and etching processes on some of the sub-film layers so that the corresponding sub-film layers form a specific pattern. Figure 2As shown, the conductive film layers in the array layer 2, including the semiconductor layer 202, the first metal layer 204, the second metal layer 206, and the third metal layer 208, all need to be patterned. After patterning, the edges of these conductive film layers form a step-like uneven structure. When forming the insulating film layers including the first insulating layer 203, the second insulating layer 205, the third insulating layer 207, and the passivation layer 209, deposition processes such as chemical vapor deposition are usually used. These insulating film layers cannot fill the above uneven structure. After multiple sub-film layers are accumulated, as shown in FIG. Figure 2 As shown, a plurality of uneven structures 20 are formed on the first surface B1 of the array layer 2 away from the substrate 1. The first surface B1 is the surface of the array layer 2 away from the substrate 1. The uneven structures 20 are formed on the first surface B1 of the array layer 2 away from the substrate 1. Figure 2 In addition, when preparing the array layer 2, if the thickness of some sub-layers is abnormal at some locations, resulting in uneven thickness of the entire sub-layer, it will also cause an uneven structure to form on the surface of the array layer 2 away from the substrate 1.

[0050] like Figure 2 As shown, the first surface B1 of the array layer 2 includes a first area A1 and a second area A2. The flatness of the first surface B1 in the first area A1 is greater than or equal to the flatness of the first surface B1 in the second area A2. For example, the first surface B1 in the second area A2 may include uneven portions such as the uneven structure 20 described above. The first surface B1 in the first area A1 may not include uneven portions such as the uneven structure 20 described above.

[0051] like Figure 2 As shown, the display layer 3 including the light emitting device 11 is located on the side of the array layer 2 away from the substrate 1. The light emitting device 11 includes a first electrode 111, a second electrode 112, and a light emitting layer 110 arranged along the thickness direction of the display panel. The light emitting layer 110 is located between the first electrode 111 and the second electrode 112.

[0052] like Figure 1 and Figure 2 As shown, the display panel also includes support columns 4, which are located on the side of the array layer 2 away from the substrate 1. During the display panel fabrication process, support columns 4 can be formed first, followed by the aforementioned light-emitting layer 110. During the fabrication of light-emitting layer 110, support columns 4 can be used to support the mask used for vapor deposition of light-emitting layer 110. Furthermore, after the display panel is fabricated, the support columns can support the display panel when subjected to pressure, thereby ensuring its compressive strength.

[0053] In the embodiment of the present invention, Figure 2As shown, the orthographic projection of the support column 4 on the plane where the display panel is located is located in the first area A1.

[0054] In the display panel provided by an embodiment of the present invention, the support column 4 is arranged corresponding to the first area A1, that is, the orthographic projection of the support column 4 on the plane where the display panel is located is located within the first area A1. Because the flatness of the first surface B1 within the first area A1 is greater than or equal to the flatness of the first surface B1 of the second area A2, after the support column 4 is arranged corresponding to the first area A1 with higher flatness, the positional stability of the support column 4 can be improved, avoiding the problem of the support column being unstable or easily collapsed due to the unevenness of the bottom of the support column 4. Such an arrangement can ensure the stability of the support column 4. On the one hand, it can prevent the debris of the support column 4 from affecting the light emission of the light-emitting layer 110 after the collapse, thereby ensuring the display effect of the display panel; on the other hand, it can also ensure that the display panel has high mechanical strength.

[0055] For example, Figure 2 As shown, the orthographic projection of the second electrode 1212 in the storage capacitor 121 on the plane where the display panel is located is located within the first area A1; the second area A2 at least partially surrounds the first area A1. The support column 4 includes a first support column 41, and the orthographic projection of the first support column 41 on the plane where the display panel is located is located within the orthographic projection of the second electrode 1212 on the plane where the display panel is located. Compared with other conductive structures in the array layer 2, the area of ​​the storage capacitor 121 is relatively large, and the side of the second electrode 1212 of the storage capacitor 121 close to the substrate 1 includes multiple sub-film layers such as the first insulating layer 203, the first metal layer 204, and the second insulating layer 205. The total thickness of these sub-film layers is approximately 700nm. The flatness of the first surface B1 at the location of the storage capacitor 121 is greater than or equal to the flatness at other locations. In this embodiment of the present invention, by arranging the first support column 41 corresponding to the second electrode 1212 of the storage capacitor 121, the stability of the first support column 41 can be improved, the collapse of the first support column 41 can be avoided, and the display effect and high mechanical strength of the display panel can be ensured.

[0056] It should be understood that in Figure 2 The sizes of the first electrode 1211 and the second electrode 1212 are for illustration only. In practice, the area of ​​the first electrode 1211 may be set larger, or the area of ​​the second electrode 1212 may be set larger. This is not limited in the embodiment of the present invention.

[0057] Optionally, in embodiments of the present invention, the geometric center of the orthographic projection of the first support column 41 onto the plane where the display panel resides can coincide with the geometric center of the orthographic projection of the second electrode 1212 onto the plane where the display panel resides, thereby creating a greater distance between the first support column 41 and the edge of the second electrode 1212. This arrangement ensures that even if the first support column 41 is slightly displaced, it will not move to the edge of the second electrode 1212. Furthermore, it ensures that the first support column 41 will not move to uneven areas such as the edge of the second electrode 1212 away from the geometric center, thereby further ensuring the display quality and mechanical strength of the display panel.

[0058] For example, Figure 3 As shown, the width of the power voltage signal line PVDD is greater than the width of the first scan line S1; the width of the power voltage signal line PVDD is greater than the width of the second scan line S2; the width of the power voltage signal line PVDD is greater than the width of the light-emitting control signal line E; and the width of the power voltage signal line PVDD is greater than the width of the data line Data. By designing the width of the power voltage signal line PVDD to be larger, the voltage drop of the power voltage signal on the power voltage signal line PVDD can be reduced, thereby improving the uniformity of the power voltage signal received by the pixel driving circuits at different locations.

[0059] In the embodiment of the present invention, the orthographic projection of the power voltage signal line PVDD on the plane where the display panel is located is located in the first area A1. Figure 3 As shown, support column 4 includes a second support column 42. The orthographic projection of second support column 42 on the plane where the display panel resides is located within the orthographic projection of power supply voltage signal line PVDD on the plane where the display panel resides. In this embodiment of the present invention, by aligning second support column 42 with the wider power supply voltage signal line PVDD, the stability of second support column 42 is improved, preventing collapse of second support column 42, and ensuring the display quality and high mechanical strength of the display panel.

[0060] In the embodiment of the present invention, the array layer 2 includes a plurality of stacked metal layers. Figure 2The metal layers include a first metal layer 204, a second metal layer 206, and a third metal layer 208 as an example. In an embodiment of the present invention, the power voltage signal line PVDD and the data line 213 can be set in different metal layers. For example, in an embodiment of the present invention, the data line 213 can be set in the third metal layer 208. When the extension direction of the power voltage signal line PVDD is set to be parallel to the extension direction of the data line 213, the embodiment of the present invention can add a fourth metal layer different from the above-mentioned first metal layer 204, second metal layer 206, and third metal layer 208 to form the power voltage signal line PVDD in the fourth metal layer. Such a setting can provide a larger design space for the position of the power voltage signal line PVDD. On the one hand, the width of the power voltage signal line PVDD can be set larger and will not short-circuit with other wirings, thereby reducing the voltage drop of the power voltage signal; on the other hand, the stability of the second support column 42 can be further improved.

[0061] Alternatively, the embodiment of the present invention can also make the power voltage signal line PVDD and the data line Data be located on the same metal layer, so that Figure 2 and Figure 4 For example, an embodiment of the present invention can make the power voltage signal line PVDD and the data line 213 both located in the third metal layer 208. This configuration can use the same process to simultaneously form the power voltage signal line PVDD and the data line Data, which can reduce the production process of the display panel and reduce the process cost of the display panel.

[0062] For example, Figure 4 As shown, the orthographic projection of the support column 4 on the plane where the display panel is located does not overlap with the orthographic projection of the scanning line on the plane where the display panel is located; Figure 4 In the figure, the scan lines are set to a plurality of signal lines including the first scan line S1, the second scan line S2 and the light-emitting control line E as an illustration. In addition, the orthographic projection of the support column 4 on the plane where the display panel is located does not overlap with the orthographic projection of the data line Data on the plane where the display panel is located. This arrangement can avoid placing the support column above the position with thinner signal lines. Because the trace width of the scan line and the data line is relatively thin, if the support column is placed above these positions, it will easily move to the position of the corresponding trace edge after the position of the support column is slightly moved. The flatness of these positions is poor, which will cause the stability of the support column to be greatly affected. The embodiment of the present invention can further ensure the position stability of the support column and reduce the probability of collapse of the support column by avoiding the placement of the support column at the position with thinner traces, thereby further ensuring the display effect and mechanical strength of the display panel.

[0063] For example, Figure 4As shown, the support column 4 also includes a third support column 43, and the orthographic projection of the third support column 43 on the plane where the display panel is located does not overlap with the orthographic projection of the conductive structure in the array layer 2 on the plane where the display panel is located. Exemplarily, the conductive structure in the array layer 2 includes the gate, source, drain and semiconductor layer of the above-mentioned thin film transistor, and also includes the above-mentioned signal line, and the above-mentioned storage capacitor. As mentioned above, in the preparation process of the display panel, the formation of the above-mentioned conductive structure needs to be formed by performing a patterning process including exposure and etching processes on the sub-film layer where the conductive structure is located, and the edges of these conductive structures will form a step-like uneven structure. The embodiment of the present invention can further ensure the positional stability of the third support column 43 by placing the third support column 43 away from the conductive structure, reduce the probability of collapse of the third support column 43, and further ensure the display effect and mechanical strength of the display panel.

[0064] For example, Figure 2 As shown, the display layer 3 also includes a pixel definition layer 30, which includes a plurality of openings 300. The light-emitting layer 110 is located within the openings 300. The shortest distance D between the support pillars 4 and the openings 300 is greater than or equal to 4 μm. By setting the shortest distance D between the support pillars 4 and the openings 300 to be greater than or equal to 4 μm, the embodiment of the present invention ensures that the support pillars 4 do not block the light emitted by the light-emitting layer 110 while supporting the mask used for vapor deposition of the light-emitting layer 110 and supporting the display panel, thereby ensuring the luminous intensity of the display panel. Furthermore, by setting the shortest distance D between the support pillars 4 and the openings 300 to be greater than or equal to 4 μm, the embodiment of the present invention ensures that the support pillars 4 do not enter the openings 300 even if the position of the support pillars 4 is slightly moved. Optionally, when the support pillars 4 are positioned corresponding to the storage capacitors 121, because the storage capacitors 121 are farther away from the openings 300, there is ample space for the placement of the support pillars 4, which increases the flexibility of the support pillar 4 placement.

[0065] Optionally, in an embodiment of the present invention, when preparing the support pillars 4, the support pillars 4 and the pixel definition layer 30 can be formed using the same process, so that the support pillars 4 are formed on the pixel definition layer 30. Specifically, the support pillars 4 and the pixel definition layer 30 can be made of organic materials. During preparation, an organic layer is first formed on the side of the array layer 2 away from the substrate 1. Then, the organic layer is patterned to simultaneously form the support pillars 4 and the above-mentioned openings 300 on the side of the organic layer away from the substrate 1. The organic layer surrounding the openings 300 serves as the pixel definition layer 30. This arrangement can reduce the production steps of the display panel and reduce the process cost of the display panel.

[0066] For example, Figure 2As shown, the display panel provided by the embodiment of the present invention further includes a planarization layer 8. The planarization layer 8 is located between the pixel definition layer 30 and the array layer 2.

[0067] For example, in an embodiment of the present invention, the display panel includes a plurality of support columns 4. When arranging the plurality of support columns 4, the support columns 4 may be arranged irregularly. Alternatively, at least some of the support columns 4 may be at equal distances from the preset base point C. Figure 1 As shown, two circles indicated by dotted lines are shown, in which part of the support columns 4 are located on the first circle 51 with a larger area, and part of the support columns 4 are located on the second circle 52 with a smaller area. The center of the first circle 51 is the preset base point C mentioned above, and the radius is r1. The center of the second circle 52 is the preset base point C mentioned above, and the radius is r2. In the embodiment of the present invention, by making at least part of the support columns 4 at equal distances from the preset base point C, the support columns 4 can be arranged in a regular pattern with equal spacing around the preset base point C as the center. When supporting the display panel, the force applied to the display panel can be evenly dispersed on the support columns located around the preset base point C with the position of the preset base point C as the center, so as to improve the mechanical strength of the display panel.

[0068] Optionally, when designing the display panel, the position of the preset base point C can be reasonably designed according to different usage requirements of the display panel. For example, the preset base point C can be set at a position where the display panel is subjected to greater force.

[0069] For example, in an embodiment of the present invention, the density of the support columns is greater than or equal to 1.5%. It should be noted that the density of the support columns refers to the ratio of the area of ​​the support columns' orthographic projection on the plane where the display panel resides to the area of ​​the display panel. By ensuring that the density of the support columns is greater than or equal to 1.5%, the embodiment of the present invention can ensure the stability of the support columns under external forces and improve the display panel's ability to withstand external forces.

[0070] Optionally, the shape of the orthographic projection of the support column 4 on the plane where the display panel is located includes any one of a polygon, an ellipse, and a circle.

[0071] It should be noted that Figure 1 The shape, area and arrangement of the display units in the embodiment are only for illustration purposes. In fact, the display units may also be arranged according to other rules in the embodiment of the present invention. Figure 5 As shown, Figure 5 A top view schematic diagram of another display panel provided in an embodiment of the present invention, wherein two adjacent columns of display units 10 are arranged to be staggered with each other in a first direction x, and / or two adjacent rows of display units 10 are arranged to be staggered with each other in a second direction y. As long as the support columns are arranged in a relatively flat first area, the embodiment of the present invention does not limit the arrangement of the display units.

[0072] like Figure 6 and Figure 7 As shown, Figure 6 A schematic top view of another display panel provided by an embodiment of the present invention is shown. Figure 7 for Figure 6 The figure shows a cross-sectional schematic diagram of the fingerprint recognition area of ​​a display panel. The display panel provided by an embodiment of the present invention also includes a fingerprint recognition area 6, which includes a fingerprint recognition module 7. During fingerprint recognition, light emitted by a fingerprint recognition light source reaches a finger 701. The light is reflected by the finger 701 and then illuminates a fingerprint recognition unit 702 provided in the display panel. The fingerprint recognition unit 702 determines the valleys and ridges of the fingerprint based on the received light to realize fingerprint recognition of the user. Here, the fingerprint recognition light source can be implemented using a light-emitting device 11 within the display panel.

[0073] In the fingerprint recognition area 6, the first area A1 includes a first sub-area A11 and a second sub-area A12. Regarding the array layer 2, the flatness of the first surface B1 in the first sub-area A11 is greater than or equal to the flatness of the first surface B1 in the second area A2. The flatness of the first surface in the second sub-area A12 is greater than or equal to the flatness of the first surface in the second area A2. Furthermore, the light transmittance of the first sub-area A11 is greater than the transmittance of the second sub-area A12.

[0074] Continue to refer Figure 7 The fingerprint recognition area 6 includes a fourth support column 44, the orthographic projection of which on the plane where the display panel is located is located in the second sub-area A12. This arrangement improves the positional stability of the fourth support column 44 and prevents the fourth support column 44 from being unstable or collapsing due to the unevenness of the bottom of the fourth support column 44. At the same time, when the display panel performs fingerprint recognition, if the fourth support column 44 interferes with the light reflected from the finger, causing the fingerprint recognition area to display bright lines, the interfering light can be blocked by the shading structure located below the fourth support column 44 during its propagation toward the backlight side of the display panel, thereby avoiding the problem of obvious vertical lines in the fingerprint recognition area and ensuring the accuracy of fingerprint recognition. The above-mentioned shading structure includes the first electrode 1211 and the second electrode 1212 of the storage capacitor 121 in the array layer 2, as well as the metal structures such as the above-mentioned signal lines.

[0075] The embodiment of the present invention further provides a display device, such as Figure 8 As shown, Figure 8 Schematic diagram of a display device provided by an embodiment of the present invention, the display device includes the above-mentioned display panel 100. The specific structure of the display panel 100 has been described in detail in the above embodiment and will not be repeated here. Figure 8The display device shown is for illustrative purposes only. The display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a laptop computer, an e-reader, or a television.

[0076] The specific structure of the display panel 100 has been described in detail in the above embodiments and will not be repeated here. Figure 8 The display device shown is for illustrative purposes only. The display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a laptop computer, an e-reader, or a television.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A display panel, characterized in that: include: substrate; an array layer located on one side of the substrate, the array layer comprising a pixel driving circuit and a plurality of signal lines electrically connected to the pixel driving circuit, the pixel driving circuit comprising at least two thin film transistors; the array layer comprising a first surface remote from the substrate, the first surface comprising a first region and a second region, the flatness of the first surface in the first region being greater than the flatness of the first surface in the second region; A display layer is located on a side of the array layer away from the substrate; the display layer includes a light-emitting device electrically connected to the pixel driving circuit; a support column located on a side of the array layer away from the substrate; an orthographic projection of the support column on the plane where the display panel is located is located within the first area; in, In the display panel, the pixel driving circuit includes a storage capacitor; the storage capacitor includes a first electrode and a second electrode arranged opposite to each other along the thickness direction of the display panel; the second electrode is located on a side of the first electrode away from the substrate; the orthographic projection of the second electrode on the plane where the display panel is located is located within the first region; the second region at least partially surrounds the first region; the support column includes a first support column, the orthographic projection of the first support column on the plane where the display panel is located is located within the orthographic projection of the second electrode on the plane where the display panel is located; or, In the display panel, the signal line includes a power supply voltage signal line; the orthographic projection of the power supply voltage signal line on the plane where the display panel is located is located within the first area; the support column includes a second support column, and the orthographic projection of the second support column on the plane where the display panel is located is located within the orthographic projection of the power supply voltage signal line on the plane where the display panel is located.

2. The display panel according to claim 1, wherein: The signal line further comprises a scan line and a data line; the width of the power supply voltage signal line is greater than the width of the scan line; the width of the power supply voltage signal line is greater than the width of the data line.

3. The display panel according to claim 2, wherein: The array layer includes a plurality of stacked metal layers, and the power supply voltage signal line and the data line are located in different metal layers.

4. The display panel according to claim 2, wherein: The array layer includes a plurality of stacked metal layers, and the power supply voltage signal line and the data line are located in the same metal layer.

5. The display panel according to claim 2, wherein: The orthographic projection of the support column on the plane where the display panel is located does not overlap with the orthographic projection of the scanning line on the plane where the display panel is located; The orthographic projection of the support column on the plane where the display panel is located does not overlap with the orthographic projection of the data line on the plane where the display panel is located.

6. The display panel according to claim 1, wherein: The display layer includes a pixel definition layer, and the pixel definition layer includes a plurality of openings; the light emitting device includes a light emitting layer, and the light emitting layer is located in the openings; The shortest distance between the support pillar and the opening is greater than or equal to 4 μm.

7. The display panel according to claim 6, wherein: The supporting pillars are formed on the pixel definition layer.

8. The display panel according to claim 1, wherein: The display panel includes a plurality of support columns, wherein at least some of the support columns are equidistant from a preset base point.

9. The display panel according to claim 1, wherein: The density of the support column is greater than or equal to 1.5%.

10. The display panel according to claim 1, wherein The shape of the orthographic projection of the support column on the plane where the display panel is located includes any one of a polygon, an ellipse, and a circle.

11. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 10.

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