Display panel and display device

Abstract

The application discloses a display panel and a display device. The display panel comprises a power line, a light-emitting sub-pixel, and a preset support column. The power line comprises first and second power signal lines arranged in different layers and electrically connected. The light-emitting sub-pixel is arranged on the power line and comprises first and second color sub-pixels arranged at intervals. The power line is electrically connected to the light-emitting sub-pixel. The preset support column is arranged on the power line between adjacent first and second color sub-pixels and formed before the second color sub-pixel. In the thickness direction of the display panel, the projection of the first color sub-pixel adjacent to the preset support column does not overlap with the projection of the first power signal line and overlaps with the projection of the second power signal line. The application can solve the problem of dark spots of the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to display technology, and more particularly to a display panel and a display device. Background Art

[0002] With the development of display technology, the application of display panels is becoming more and more extensive, and correspondingly, the requirements for display panels are becoming higher and higher.

[0003] However, existing display panels may have dark spots during display, resulting in poor display effects. Summary of the Invention

[0004] The present invention provides a display panel and a display device to prevent dark spots from appearing on the display panel during display.

[0005] In a first aspect, an embodiment of the present invention provides a display panel, comprising:

[0006] The power line includes a first power signal line and a second power signal line provided in different layers, and the first power signal line is electrically connected to the second power signal line;

[0007] Light-emitting sub-pixels are provided on the power line, the light-emitting sub-pixels include: first color sub-pixels and second color sub-pixels that are spaced apart, and the power line is electrically connected to the light-emitting sub-pixels;

[0008] A preset support column is provided on the power line and is located between adjacent first color sub-pixels and second color sub-pixels, and the first color sub-pixels are formed before the second color sub-pixels;

[0009] Along the thickness direction of the display panel, the projection of the first color sub-pixel adjacent to the preset supporting column does not overlap with the projection of the first power signal line, but overlaps with the projection of the second power signal line.

[0010] Optionally, the display panel includes: a first flat layer and a second flat layer stacked together; the light-emitting sub-pixel is provided on a side of the second flat layer away from the first flat layer;

[0011] The first planar layer covers the first power signal line, and the second planar layer covers the second power signal line; or the first planar layer covers the second power signal line, and the second planar layer covers the first power signal line.

[0012] Optionally, a through hole is provided on a side surface of the first flat layer close to the second flat layer, and the second power signal line is connected to the second power signal line through the through hole.

[0013] Optionally, the first power signal line is disconnected at a position corresponding to the first color sub-pixel adjacent to the preset supporting column.

[0014] Optionally, the first power signal line detours at a position corresponding to the first color sub-pixel adjacent to the preset support column;

[0015] Preferably, at the detour, the first power signal line has at least one branch line, and the branch line surrounds a portion of the pixel edge of the first color sub-pixel.

[0016] Optionally, a width of a portion of the second power signal line corresponding to a disconnected or bypassed portion of the first power signal line is greater than a width of a non-disconnected portion of the second power signal line corresponding to the first power signal line.

[0017] Optionally, along the thickness direction of the display panel, the projection of the first color sub-pixel that is not adjacent to any of the preset supporting pillars overlaps with the projections of the first power signal line and the second power signal line.

[0018] Optionally, the display panel further comprises: a driving layer, provided on a side of the power line away from the light-emitting sub-pixel;

[0019] an anode, provided between the power line and the light-emitting sub-pixel, and connected to the light-emitting sub-pixel;

[0020] The pixel definition layer is arranged on a side of the power line away from the driving layer. The pixel definition layer has a sub-pixel opening corresponding to the light-emitting sub-pixel, and the anode is exposed in the sub-pixel opening.

[0021] In a second aspect, an embodiment of the present invention further provides a display device, comprising the display panel described in the first aspect.

[0022] The technical solution of an embodiment of the present invention utilizes a display panel in which the first color sub-pixel is formed before the second color sub-pixel. By providing a predetermined support column between adjacent first and second color sub-pixels, the area corresponding to the first color sub-pixel contains only the second power signal line, without the first power signal line. This reduces the thickness of the area corresponding to the first color sub-pixel. After the mask corresponding to the second color sub-pixel is placed on the predetermined support column, the mask is farther away from the light-emitting layer corresponding to the first color sub-pixel, and the probability of the mask adhering to the light-emitting layer is also lower. This prevents a short circuit between the subsequently fabricated cathode and anode electrodes, and thus prevents the generation of dark spots. Furthermore, since the second power signal line runs through the bottom of the light-emitting sub-pixel, the color shift effect is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a schematic structural diagram of a display panel in the prior art;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the display panel when evaporating sub-pixels;

[0025] Figure 3 A schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0026] Figure 4 for Figure 3 Cross-section along direction A1A2;

[0027] Figure 5 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0028] Figure 6 for Figure 5 Cross-section along direction A1A2;

[0029] Figure 7 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0030] Figure 8 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0031] Figure 9 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0032] Figure 10 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0034] As mentioned in the background art, existing display panels may have dark spot problems during display. After careful research, the inventors found that the cause of this technical problem is: Figure 1 Schematic diagram of the structure of a display panel in the prior art. Figure 2 for Figure 1 Schematic diagram of the structure of the display panel when evaporating sub-pixels, refer to Figure 1 and Figure 2The display panel includes a first color sub-pixel 11', a second color sub-pixel 12', a third color sub-pixel 13' and a preset support column 14'. The preset support column 14' is set between the first color sub-pixel 11' and the second color sub-pixel 12', for example, on the center line connecting the first color sub-pixel 11' and the second color sub-pixel 12'. Figure 2 As shown, the first color sub-pixel 11' is evaporated before the second color sub-pixel 12'. When the second color sub-pixel 12' is evaporated, since the organic light-emitting material corresponding to the first color sub-pixel 11' already exists in the pixel opening 111' corresponding to the first color sub-pixel 11', the mask 20' required for evaporating the second color sub-pixel 12' does not have an opening at the position corresponding to the first color sub-pixel 11', and since the preset support column 14' is located on the center line connecting the first color sub-pixel and the second color sub-pixel, the mask around the preset support column is greatly deformed under the action of the magnetic force of the magnetic plate, and the thickness of the display panel corresponding to the first color sub-pixel is also thicker, so that the mask adheres to the organic light-emitting material corresponding to the first color sub-pixel. When the cathode is subsequently made, since there is no light-emitting material in the opening corresponding to the first color sub-pixel, the cathode and the anode are in contact, causing a short circuit, and finally forming a dark spot when the display is displayed.

[0035] In view of the above technical problems, the present invention proposes the following solutions:

[0036] Figure 3 A schematic structural diagram of a display panel provided by an embodiment of the present invention is shown in FIG. Figure 4 for Figure 3 Cross-section along the A1A2 direction, combined with Figure 3 and Figure 4 The display panel includes: a power line, including a first power signal line 16 and a second power signal line 17 arranged in different layers, and the first power signal line 16 is electrically connected to the second power signal line 17; a light-emitting sub-pixel, provided on the power line, and the light-emitting word pixel includes: a first color sub-pixel 11 and a second color sub-pixel 12 arranged at intervals, and the power line is electrically connected to the light-emitting word pixel; a preset support column 14, provided on the power line and located between adjacent first color sub-pixels 11 and second color sub-pixels 12, and the first color sub-pixel 11 is formed before the second color sub-pixel 12; along the thickness direction of the display panel, the projection of the first color sub-pixel 11 adjacent to the preset support column 14 does not overlap with the projection of the first power signal line 16, and overlaps with the projection of the second power signal line 17.

[0037] Specifically, the display panel may include multiple layers, such as Figure 4As shown, it may include a substrate 21, a buffer layer 22, a driving layer (specifically including an active layer 23, a gate insulating layer 24, a first metal layer 25, a first interlayer insulating layer 26, a second metal layer 27 and a second interlayer insulating layer 28), a third metal layer, a first flat layer 29, a fourth metal layer, a second flat layer 20, an anode (not shown), a pixel defining layer 15 and a preset support column 14; wherein the driving layer is arranged on the side of the power line away from the light-emitting sub-pixel; the anode is arranged between the power line and the light-emitting sub-pixel, and connects the light-emitting sub-pixel; the pixel definition layer 15 is arranged on the side of the power line away from the driving layer, and the pixel definition layer 15 has a sub-pixel opening corresponding to the light-emitting sub-pixel, and the anode is exposed in the sub-pixel opening.The display panel includes a plurality of light-emitting sub-pixels and a pixel driving circuit corresponding to the plurality of light-emitting sub-pixels. The pixel driving circuit is used to drive the corresponding light-emitting sub-pixels to emit light. The pixel driving circuit includes a plurality of transistors (such as a driving transistor and a switching transistor). A typical pixel driving circuit includes two transistors and one capacitor, which is also often referred to as a 2T1C pixel driving circuit in the art. The other includes seven transistors and one capacitor, which is also often referred to as a 7T1C pixel driving circuit in the art. The first metal layer 25 is used to set the gate electrode of the transistor, and the second metal layer 27 is used to set the plate of the capacitor in the pixel driving circuit (the other plate of the capacitor can be set on the first metal layer). layer); the pixel driving circuit requires multiple signal lines to drive, such as data lines, scan lines, initialization signal lines, high-level power signal lines and low-level power signal lines, etc. In this embodiment, the first power signal line and the second power signal line are used to provide a high-level power signal (VDD) for the pixel driving circuit; the first power signal line 16 and the second power signal line 17 are electrically connected, thereby reducing resistance and improving brightness uniformity; one of the first power signal line and the second power signal line is located in the third metal layer, and the other is located in the fourth metal layer. The third metal layer can be, for example, a metal layer for setting a data line, and the fourth metal layer is used to set a power line; the display panel typically may include a first The color sub-pixel 11, the second color sub-pixel 12 and the third color sub-pixel 13 have different luminous colors. For example, the first color sub-pixel 11 is a blue sub-pixel, the second color sub-pixel 12 is a red sub-pixel, and the third color sub-pixel 13 is a green sub-pixel. The order in which the three are formed on the display panel is also different. It should be noted that the formation order described in this embodiment is the formation order of the luminous layers of different color sub-pixels. Each color sub-pixel is formed by evaporating the corresponding luminous layer through a mask. For example, the first color sub-pixel is formed before the second color sub-pixel 11, which means that the luminous layer of the first color sub-pixel is formed first, and then the second color sub-pixel 12 is formed. The light-emitting layer of the first color sub-pixel 11 is first evaporated using the first mask, and then the light-emitting layer of the second color sub-pixel 12 is evaporated using the second mask. The preset support column 14 is used to support the mask, that is, before evaporation, the mask needs to be supported by the preset support column 14. There are many ways to arrange sub-pixels in the display panel, and there are also many ways to set the position of the preset support column 14. When the preset support column 14 is set between the adjacent first color sub-pixel 11 and the second color sub-pixel 12, because the area where the first-formed sub-pixel (the first color sub-pixel) is located is thicker, the first-formed sub-pixel is easily damaged by the mask corresponding to the later-formed sub-pixel. Therefore, in this embodiment, only the second power signal line 17 can be set in the area corresponding to the first color sub-pixel, and the first power signal line 16 is not set, so that the thickness of the area corresponding to the first color sub-pixel 11 is smaller.After placing the mask corresponding to the second color sub-pixel 12 on the preset support column 14, since the mask is far away from the light-emitting layer corresponding to the first color sub-pixel, the probability of the mask sticking to the light-emitting layer is also low, so that the cathode electrode and the anode electrode produced subsequently will not be short-circuited, and therefore no dark spots will be generated.

[0038] It should be noted that the display panel contains multiple support columns, and not all of them may be located between adjacent first and second color sub-pixels. The pre-set support columns in the above embodiment refer only to support columns located on the line connecting the centers of the adjacent first and second color sub-pixels. For support columns not located on the line connecting the centers of the first and second color sub-pixels (which can be defined as ordinary support columns), the deformed portion of the mask is farther from the first color sub-pixel, and the probability of damage to the light-emitting layer is also lower. Therefore, the special limitations of the above embodiment are not required for this part of the structure. In addition, overlapping the projection of the first color sub-pixel and the projection of the second power signal line can improve color shift.

[0039] In the display panel used, the first color sub-pixel is formed before the second color sub-pixel. By providing a predetermined support column between adjacent first and second color sub-pixels, the area corresponding to the first color sub-pixel contains only the second power signal line, without the first power signal line. This reduces the thickness of the area corresponding to the first color sub-pixel. After the mask corresponding to the second color sub-pixel is placed on the predetermined support column, the mask is farther away from the light-emitting layer corresponding to the first color sub-pixel, reducing the probability of the mask adhering to the light-emitting layer. This prevents short-circuiting the cathode and anode electrodes subsequently fabricated, and thus prevents dark spots. Furthermore, because the second power signal line runs underneath the light-emitting sub-pixel, the color shift effect is also improved.

[0040] Alternatively, as Figure 4 As shown, the first planar layer 29 and the second planar layer 20 are stacked; the light-emitting sub-pixel is located on the side of the second planar layer 20 away from the first planar layer 29; the first planar layer 29 covers the second power signal line 17, and the second planar layer 20 covers the first power signal line 16. In other words, the layer where the first power signal line 16 is located is located between the layer where the second power signal line 17 is located and the layer where the preset support column 14 is located. In other words, the first power signal line 16 is located on the fourth metal layer, and the second power signal line 17 is located on the third metal layer; of course, in some other embodiments, Figure 5 A schematic structural diagram of another display panel provided by an embodiment of the present invention is shown. Figure 6 for Figure 5In the cross-sectional view along direction A1A2, in this embodiment, the first planar layer 29 covers the first power signal line 16, and the second planar layer 20 covers the second power signal line 17. In other words, the layer where the second power signal line 17 is located is located between the layer where the first power signal line 16 is located and the layer where the predetermined support pillar 14 is located. In other words, the first power signal line 16 is located in the third metal layer, and the second power signal line 17 is located in the fourth metal layer. Both the first power signal line 16 and the second power signal line 17 can be made of titanium-aluminum-titanium alloy.

[0041] Optionally, combined Figures 3 to 6 In the above embodiment, the first power signal line 16 is disconnected at the location corresponding to the first color sub-pixel adjacent to the predetermined support pillar. This arrangement simplifies the design and facilitates achieving a higher pixel density. Regarding the method of disconnecting the first power signal line 16, it is preferable that the layer where the second power signal line 17 is located is located between the layer where the first power signal line 16 is located and the layer where the support pillar 14 is located. In this case, the inorganic layer is located below the first power signal line 16, making it easier to etch the first power signal line, with a lower probability of residue and a higher success rate.

[0042] Of course, if Figure 7 As shown, Figure 7 A structural schematic diagram of another display panel provided in an embodiment of the present invention. In this embodiment, the first power signal line 16 detours at a position corresponding to the first color sub-pixel 11 adjacent to the preset support column 14; specifically, it can detour along the pixel edge of the first color sub-pixel 11. At the detour, the first power signal line 16 has at least one branch line 161, which surrounds part of the pixel edge of the first color sub-pixel 11. Figure 7 The first power signal line 16 has a branch line 161 that detours along the two left pixel edges. For example, this branch line can detour along the pixel-defining layer between corresponding sub-pixels to avoid overlapping with the sub-pixels. This, in turn, prevents the area where the first color sub-pixels are located from being thicker, thereby preventing the first color sub-pixels from being damaged by the mask and causing dark spots. Furthermore, this detour reduces the overall resistance of the first and second power signal lines 16 and 17 compared to disconnecting them, thereby improving brightness uniformity.

[0043] Optionally, Figure 8 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Figure 8 The first power signal line 16 detours at a position corresponding to the first color sub-pixel 11 adjacent to the preset support column 14. Figure 8The first power signal line 16 in the image is divided into two branches 161 that run along the edge of the pixel, forming a U-shaped structure. Specifically, in this embodiment, the first power signal line 16 is arranged in a grid pattern at the position corresponding to the first color sub-pixel adjacent to the preset support column, and the rest of the first power signal line 16 is designed to penetrate the sub-pixels (first color sub-pixel and second color sub-pixel). On the one hand, the grid pattern can further reduce the resistance of the first power signal line, thereby reducing the overall resistance of the first power signal line and the second power signal line, thereby improving brightness uniformity. On the other hand, the design of penetrating sub-pixels is also conducive to improving color shift. Of course, the entire first power signal line can also be arranged in a grid structure.

[0044] Optionally, Figure 9 A structural schematic diagram of another display panel provided in an embodiment of the present invention. In this embodiment, the width of the portion of the second power signal line 17 corresponding to the disconnected or bypassed portion of the first power signal line 16 is greater than the width of the non-disconnected portion of the second power signal line corresponding to the first power signal line 16.

[0045] Specifically, in the part where the first power signal line 16 is disconnected or bypassed, the overall equivalent resistance of the first power signal line and the second power signal line is relatively large, and the voltage drop generated by the signal in this part is also relatively large. Correspondingly, the brightness difference between the sub-pixels in this part and the surrounding sub-pixels is also relatively large; therefore, the width of the second power signal line 17 in this part can be set to be larger, thereby reducing the resistance of the second power signal line in this part, that is, reducing the overall equivalent resistance of the first power signal line and the second power signal line in this part, reducing the voltage drop generated by the signal in this part, and correspondingly reducing the brightness difference between the sub-pixels in this part and the surrounding sub-pixels, so that no abrupt bright and dark dividing point will be generated, and the display effect is better.

[0046] Optionally, refer to Figures 3 to 9 Along the thickness direction of the display panel, the projection of the first color sub-pixel that is not adjacent to any preset support column 14 overlaps with the projection of the first power signal line 16 and the second power signal line 17.

[0047] Specifically, in this embodiment, except for the part of the first power signal line corresponding to the first sub-pixel adjacent to the preset support column, the other parts all run through the sub-pixels in the same column, and the second power signal line runs through all the sub-pixels in the same column. With this arrangement, compared with the grid-like power signal line, the anode of each sub-pixel will be flatter, which is beneficial to reduce color deviation.

[0048] Alternatively, as Figure 4As shown, a through hole is provided on a side of the first planar layer 29 near the second planar layer 20, and the second power signal line 17 is connected to the first power signal line 16 through the through hole. Specifically, the via hole can be provided in the display area or the non-display area, as long as it can connect the first power signal line and the second power signal line. The via holes can be evenly distributed along the first power signal line.

[0049] Optionally, the sub-pixels in the display panel are arranged in a diamond arrangement or a tripod arrangement.

[0050] Specifically, in both the diamond arrangement and the tripod arrangement display panels, there are some support columns arranged on the center connection line between the first color sub-pixel and the second color sub-pixel, which means that dark spot problems will occur. Therefore, this embodiment can be used for the differentiated arrangement of the metal first power signal line and the second power signal line of the display panel with diamond arrangement or tripod arrangement; the specific arrangement methods of diamond arrangement and tripod arrangement are well known to those skilled in the art and will not be repeated here.

[0051] The experiment proved that Figure 1 and Figure 2 The corresponding display panel has a dark point rate of 2% because both the first power signal line and the second power signal line pass through the sub-pixels, while the display panel corresponding to this solution has a dark point rate of 0%.

[0052] The embodiment of the present invention further provides a display device, such as Figure 10 As shown, Figure 10 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. The display device includes the display panel provided in any embodiment of the present invention. The display device can be, for example, a mobile phone, tablet computer, smart watch, MP3, MP4, smart helmet, or other wearable device. Since it includes the display panel provided in any embodiment of the present invention, it also has the same beneficial effects, and no further details are given here.

[0053] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: The display panel includes: The power line includes a first power signal line and a second power signal line provided in different layers, and the first power signal line is electrically connected to the second power signal line; Light-emitting sub-pixels are provided on the power line, the light-emitting sub-pixels include: first color sub-pixels and second color sub-pixels that are spaced apart, and the power line is electrically connected to the light-emitting sub-pixels; A preset support column is provided on the power line and is located between adjacent first color sub-pixels and second color sub-pixels, and the first color sub-pixels are formed before the second color sub-pixels; Along the thickness direction of the display panel, the projection of the first color sub-pixel adjacent to the preset supporting column does not overlap with the projection of the first power signal line, but overlaps with the projection of the second power signal line.

2. The display panel according to claim 1, wherein: include: A first flat layer and a second flat layer are stacked; the light-emitting sub-pixel is arranged on a side of the second flat layer away from the first flat layer; The first planar layer covers the first power signal line, and the second planar layer covers the second power signal line; or the first planar layer covers the second power signal line, and the second planar layer covers the first power signal line.

3. The display panel according to claim 2, wherein: A through hole is provided on a side surface of the first flat layer close to the second flat layer, and the second power signal line is connected to the first power signal line through the through hole.

4. The display panel according to claim 1, wherein: The first power signal line is disconnected at a position corresponding to the first color sub-pixel adjacent to the preset supporting column.

5. The display panel according to claim 1, wherein: The first power signal line detours at a position corresponding to the first color sub-pixel adjacent to the preset supporting column.

6. The display panel according to claim 5, wherein: At the detour, the first power signal line has at least one branch line, and the branch line surrounds a portion of the pixel edge of the first color sub-pixel.

7. The display panel according to claim 4, wherein: The width of the disconnected portion of the second power signal line corresponding to the first power signal line is greater than the width of the non-disconnected portion of the second power signal line corresponding to the first power signal line.

8. The display panel according to claim 1, wherein: Along the thickness direction of the display panel, the projection of the first color sub-pixel that is not adjacent to any of the preset supporting pillars overlaps with the projections of the first power signal line and the second power signal line.

9. The display panel according to claim 1, wherein: Also includes: A driving layer is provided on a side of the power line away from the light-emitting sub-pixel; an anode, provided between the power line and the light-emitting sub-pixel, and connected to the light-emitting sub-pixel; The pixel definition layer is arranged on a side of the power line away from the driving layer. The pixel definition layer has a sub-pixel opening corresponding to the light-emitting sub-pixel, and the anode is exposed in the sub-pixel opening.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 9.

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