Display panel, display module and display device

Abstract

This invention provides a display panel, a display module, and a display device. The display panel includes a display area and a non-display area disposed on at least one side of the display area; the non-display area includes a bending area and a bonding area disposed on the side of the bending area away from the display area; the bonding area is provided with a plurality of pads; the non-display area is provided with a first power line and a second power line extending through the bending area to the bonding area, the first power line and the second power line being electrically connected to the plurality of pads in the bonding area respectively; both the first power line and the second power line include a first end located in the bending area and a second end electrically connected to the pads; wherein the distance between the second ends of the first power line and the second power line is greater than the distance between the first ends of the first power line and the first ends of the second power line. By employing the solution of this invention, the mutual influence of different voltages between the first power line and the second power line can be reduced or even avoided, ensuring voltage stability and improving the brightness uniformity during light emission display.

Description

Technical Field

[0001] This invention relates to a display panel, a display module, and a display device, belonging to the field of display technology. Background Technology

[0002] OLED (Organic Light-Emitting Diode) has a series of advantages such as self-illumination, wide viewing angle, light weight, thinness, high brightness, low power consumption and fast response. Therefore, OLED display panels have become very popular display devices at home and abroad, with broad application prospects.

[0003] In OLED display panels, the stability of the cathode and anode voltages of the OLED device is a crucial factor directly affecting the display performance and lifespan of the OLED device. The OLED cathode and anode are electrically connected to a flexible printed circuit board (FPC) via negative power lines (Emitting Layer Voltage Series, ELVSS) and positive power lines (Emitting Layer Voltage Device, ELVDD), respectively, and voltage control is based on the FPC. In existing solutions, the design of the positive and negative power lines is flawed, leading to voltage instability and resulting in poor brightness uniformity during OLED light emission. Summary of the Invention

[0004] This invention provides a display panel, a display module, and a display device to solve the problem of poor brightness uniformity in OLED devices caused by unreasonable design of positive and negative power lines, which leads to voltage instability.

[0005] In a first aspect, embodiments of the present invention provide a display panel, which includes a display area and a non-display area disposed on at least one side of the display area; the non-display area includes a bending area and a binding area disposed on the side of the bending area away from the display area;

[0006] The bonding area is provided with a plurality of pads; the non-display area is provided with a first power line and a second power line extending through the bending area to the bonding area, and the first power line and the second power line are respectively electrically connected to the plurality of pads in the bonding area;

[0007] Both the first power line and the second power line include a first end located in the bending area and a second end electrically connected to the pad; wherein the distance between the second end of the first power line and the second end of the second power line is greater than the distance between the first end of the first power line and the first end of the second power line.

[0008] Based on the above display panel, optionally, the first power line includes a first sub-line, a second sub-line and a third sub-line, the first sub-line includes a first end of the first power line, and the first sub-line is electrically connected to the third sub-line through the second sub-line, and the third sub-line is electrically connected to a plurality of pads in the bonding area;

[0009] The first sub-line is parallel to the third sub-line.

[0010] Based on the above display panel, optionally, the distance from the third sub-line to the second power line is greater than the distance from the first sub-line to the second power line.

[0011] Based on the above display panel, optionally, the second power line includes a fourth sub-line, a fifth sub-line, and a sixth sub-line. The fourth sub-line includes a first end of the second power line, and the fourth sub-line is electrically connected to the sixth sub-line through the fifth sub-line. The sixth sub-line is electrically connected to a plurality of pads in the bonding area.

[0012] The line width of the fifth sub-line is greater than that of the fourth sub-line.

[0013] Based on the above display panel, optionally, the pads include a plurality of first pads connected to the first power line, a plurality of second pads connected to the second power line, and a third pad disposed between the second pads and the first pads, the third pad being used to provide a detection signal to the display panel.

[0014] Based on the above display panel, optionally, the third pad includes a screen detection pad and / or a touch detection pad, wherein the screen detection pad is used to provide a screen detection signal and the touch detection pad is used to provide a touch detection signal.

[0015] Based on the above display panel, optionally, the line width of the second end of the first power line is greater than the line width of the first end, and / or, the line width of the second end of the second power line is greater than the line width of the first end.

[0016] Based on the above display panel, optionally, the first power line is a negative power line, the second power line is a positive power line, and the line width of the second end of the second power line is greater than the line width of the second end of the first power line.

[0017] Optionally, the number of pads connected to the second power line is greater than the number of pads connected to the first power line.

[0018] Secondly, embodiments of the present invention also provide a display module, which includes the display panel described in any of the above-mentioned claims.

[0019] Thirdly, embodiments of the present invention also provide a display device, which includes the display module described above.

[0020] The display panel, display module, and display device provided by this invention include a display area and a non-display area disposed on at least one side of the display area; the non-display area includes a bending area and a bonding area disposed on the side of the bending area away from the display area; the bonding area is provided with multiple pads; the non-display area is provided with a first power line and a second power line extending through the bending area to the bonding area, the first power line and the second power line being electrically connected to the multiple pads of the bonding area respectively; both the first power line and the second power line include a first end located in the bending area and a second end electrically connected to the pads; wherein the distance between the second ends of the first power line and the second power line is greater than the distance between the first ends of the first power line and the first ends of the second power line. This configuration, by making the distance between the second ends of the first power line and the second power line greater than the distance between the first ends of the first power line and the first ends of the second power line, increases the distance between the pads connected to the first power line and the pads connected to the second power line, thereby reducing or even avoiding the mutual influence of different voltages between them, ensuring voltage stability, and thus improving the brightness uniformity of the OLED device during light emission, and improving the display effect. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. Furthermore, these drawings and textual descriptions are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the concept of the invention to those skilled in the art by reference to specific embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of an existing display panel;

[0023] Figure 2 This is a schematic diagram of the structure of a display panel provided in one embodiment of the present invention;

[0024] Figure 3 for Figure 2 A magnified view of region P in the middle;

[0025] Figure 4 for Figure 1 Enlarged schematic diagram of the middle pad area;

[0026] Figure 5 for Figure 2 Enlarged schematic diagram of the middle pad area;

[0027] Figure 6 This is a schematic diagram of the structure of a display device provided in one embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Display area; 2-Non-display area; 21-Bending area; 22-Bonding area; 30-Pad; 301-First pad; 302-Second pad; 303-Third pad; 304-Invalid pad; 31-First power line; 31a-First end of the first power line; 31b-Second end of the first power line; 311-First sub-line; 312-Second sub-line; 313-Third sub-line; 32-Second power line; 32a-First end of the second power line; 32b-Second end of the second power line; 321-Fourth sub-line; 322-Fifth sub-line; 323-Sixth sub-line. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] Application Overview

[0032] Reference Figure 1 , Figure 1 This is a schematic diagram of a conventional display panel. The display panel includes a display area 1 and a non-display area 2 disposed on at least one side of the display area 1. The display area 1 includes a plurality of sub-pixels (not shown in the figure) arranged in an array for emitting light and displaying light. The non-display area 2 includes a bending area 21 and a bonding area 22 disposed on the side of the bending area 21 away from the display area 1. The bonding area 22 is provided with a plurality of pads 30. The plurality of pads 30 are electrically connected to circuit devices (not shown in the figure) in the display area 1 and the non-display area 2 through traces. The traces include a first power line 31 and a second power line 32, which are used to provide positive and negative voltages, respectively. Figure 1 In the corresponding embodiment, the first power line 31 is a negative power line, mainly distributed at the edge of the display panel, and is used to provide negative voltage. The second power line 32 is a positive power line, mainly distributed inside the display panel, and is used to provide positive voltage.

[0033] To achieve the narrow bezel design, during the manufacturing of the display module, the display panel is bent at the bending area 21, causing the bonding area 22 to bend towards the backlight side of the display panel, thus achieving the narrow bezel. The driver chip and FPC are then bonded to their respective pads 30, thereby establishing electrical connection between the driver chip and FPC and the circuitry of the display panel.

[0034] During testing and actual use, the inventors discovered that voltage instability was a common problem, leading to poor brightness uniformity in the OLED device. Through research, the inventors found that this was mainly due to a significant voltage difference between the first power line 31 and the second power line 32, and their small distance apart. Therefore, they easily interfered with each other after power was applied, resulting in voltage instability.

[0035] To address the aforementioned problems, this invention provides an improved solution. Without altering the wiring in other locations, it optimizes the design of sections where positive and negative power lines are prone to mutual interference, thereby improving the problem of poor uniformity in light emission caused by voltage instability. The following examples and embodiments illustrate the specific implementation scheme in a non-limiting manner.

[0036] Exemplary display panel

[0037] Reference Figure 2 , Figure 2 This is a schematic diagram of the structure of a display panel provided in one embodiment of the present invention. Figure 2 As shown, with Figure 1 The corresponding display panel is similar. The display panel in this embodiment includes a display area 1 and a non-display area 2 disposed on at least one side of the display area 1. The non-display area 2 includes a bending area 21 and a bonding area 22 disposed on the side of the bending area 21 away from the display area 1. The bonding area 22 is provided with a plurality of pads 30. The non-display area 2 is provided with a first power line 31 and a second power line 32 extending through the bending area 21 to the bonding area 22. The first power line 31 and the second power line 32 are respectively electrically connected to the plurality of pads 30 of the bonding area 22.

[0038] Based on this, both the first power line 31 and the second power line 32 include a first end located in the bending area 21 and a second end electrically connected to the pad 30; wherein, the distance between the second end 31b of the first power line and the second end 32b of the second power line is greater than the distance between the first end 31a of the first power line and the first end 32a of the second power line.

[0039] First, it should be noted that, unless otherwise specified, "multiple" in the embodiments of the present invention refers to at least two.

[0040] Secondly, in this embodiment, the first power line 31 is a negative power line and the second power line 32 is a positive power line. However, it is understood that in other embodiments, the two can be interchanged, that is, the first power line 31 can be a positive power line and the second power line 32 can be a negative power line.

[0041] Based on the above design, relative to Figure 1In the existing display panel shown, it is evident that the distance between the second end 31b of the first power line and the second end 32b of the second power line is larger. Consequently, the distance between the pads 30 connected to the first power line 31 and the second power line 32 also increases accordingly. Since the voltage interference between the first power line 31 and the second power line 32 is more likely to occur at the connection points with the pads 30, increasing the distance between the pads 30 connected to the first power line 31 and the second power line 32 can reduce or even completely eliminate the voltage interference between the first power line 31 and the second power line 32, thereby improving the uniformity of the display panel's brightness.

[0042] Based on the above plan, and referring to Figure 3 , Figure 3 for Figure 2 A magnified view of region P in the middle. (See image below.) Figure 3 As shown, in some embodiments, the first power line 31 includes a first sub-line 311, a second sub-line 312, and a third sub-line 313 connected sequentially. The first sub-line 311 includes a first end 31a of the first power line, and the third sub-line 313 is electrically connected to a plurality of pads 30 of the bonding area 22. Furthermore, the first sub-line 311 and the third sub-line 313 are parallel. This design, with the first sub-line 311 and the third sub-line 313 parallel, facilitates planning the routing direction of the first power line 31 and its adjacent traces, and also facilitates the actual etching process to obtain the first power line 31. Moreover, in existing display panels, the first power line 31 also has a similar structure including a first sub-line 311, a second sub-line 312, and a third sub-line 313, and the first sub-line 311 portion and the third sub-line 313 portion are also parallel. Therefore, this design requires minimal modification to the etching process, making it easy to implement.

[0043] Furthermore, continue to refer to Figure 3 In some embodiments, the distance from the third sub-line 313 to the second power line 32 is greater than the distance from the first sub-line 311 to the second power line 32. That is, the distance from the third sub-line 313 to the second power line 32 is smaller than the distance from the first sub-line 311 to the second power line 32. This is equivalent to the first power line 31 gradually moving away from the second power line 32 as it extends from the first end to the second end. This design can better ensure that the distance between the second end 31b of the first power line and the second end 32b of the second power line is greater than the distance between the first end 31a of the first power line and the first end 32a of the second power line. At the same time, it can also make the routing of the third sub-line 313 more compact with the adjacent traces connecting other pads 30.

[0044] It should be noted that when calculating the distance from the third sub-line 313 and the first sub-line 311 to the second power line 32, a sub-line segment parallel to the third sub-line 313 and the first sub-line 311 can be selected from the second power line 32 and the calculation can be based on this segment.

[0045] In addition, continue to refer to Figure 3 Similar to the first power line 31, in some embodiments, the second power line 32 includes a fourth sub-line 321, a fifth sub-line 322, and a sixth sub-line 323 connected in sequence. The fourth sub-line 321 includes a first end 32a of the second power line, and the sixth sub-line 323 is electrically connected to a plurality of pads 30 of the bonding area 22. Furthermore, the fourth sub-line 321 and the sixth sub-line 323 are parallel. Also, further, in some embodiments, the distance from the sixth sub-line 323 to the first power line 31 is greater than the distance from the fourth sub-line 321 to the first power line 31. The reasons and purposes for the aforementioned design are similar to those for the first power line 31, and therefore will not be repeated.

[0046] In addition, continue to refer to Figure 2 and 3 In some embodiments, the linewidth of the fifth sub-line 322 is greater than the linewidth of the fourth sub-line 321. Based on this, since a larger linewidth results in a smaller impedance, when the linewidth of the fifth sub-line 322 is greater than the linewidth of the fourth sub-line 321, the impedance is lower. Figure 1 The second power line 32 shown is equivalent to partially increasing the line width of the second power line 32, which helps to reduce the impedance of the second power line 32 and thus improve the stability of the power supply.

[0047] Similarly, in some embodiments, the line width of the sixth sub-line 323 can be set to be greater than the line width of the fourth sub-line 321, or, while the line width of the fifth sub-line 322 is greater than the line width of the fourth sub-line 321, the line width of the sixth sub-line 323 is also greater than the line width of the fourth sub-line 321. This reduces the impedance of the second power line 32 and improves the stability of the power supply.

[0048] In addition, similar to the second power line 32, the line width of the second sub-line 312 and / or the third sub-line 313 can be appropriately increased relative to the line width of the first sub-line 311, provided that space permits, thereby improving the stability of power supply.

[0049] Furthermore, in some embodiments, the linewidth of the second end 31b of the first power line can be set to be greater than the linewidth of the first end, and / or, the linewidth of the second end 32b of the second power line can be greater than the linewidth of the first end. For example, the linewidth of the first power line 31 gradually increases as it extends from the first end to the second end; the linewidth of the second power line 32 gradually increases as it extends from the first end to the second end. Specifically, since the edge of the display panel has fewer components than the internal device structure, the edge of the display panel has more space for routing compared to the interior. That is, the area where the second ends of the first and second power lines are located has more space for routing than the first end. Therefore, by increasing the width of the second ends of the first and second power lines, the overall linewidth of the first and second power lines can be increased, thereby reducing the impedance of the first and second power lines and improving voltage stability.

[0050] Furthermore, in some embodiments, when the first power line 31 is a negative power line and the second power line 32 is a positive power line, the line width of the second end 32b of the second power line can be set to be greater than the line width of the second end 31b of the first power line. That is, the line width of the end of the positive power line connected to the pad 30 is greater than the line width of the end of the negative power line connected to the pad 30. Thus, since the positive voltage end has higher requirements for the strength and stability of the voltage signal than the negative voltage end, by making the line width of the second end 32b of the second power line relatively large, the number of pads 30 connected to the second power line 32 can be increased while keeping the size of the pads 30 unchanged. This results in a greater number of pads 30 connected to the second power line 32 than the number of pads 30 connected to the first power line 31, thereby providing a more sufficient positive voltage signal to the display panel.

[0051] Of course, it is understandable that in other embodiments, the line width of the second end 31b of the first power line could also be increased, thereby increasing the number of pads 30 connected to the first power line 31, so that the negative voltage signal provided to the display panel is more sufficient. However, the space of the bonding area 22 is limited, so trade-offs need to be made, and the better solution should be selected as much as possible. For example, the inventors found through research that the positive power line has higher requirements for signal than the negative power line, so when making adjustments, the design scheme that is more conducive to the sufficient signal of the positive power line is given priority.

[0052] In addition, refer to Figure 1 As mentioned earlier, due to the significant voltage difference between the first power line 31 and the second power line 32, the distance between the second ends 31b and 32b of the first and second power lines cannot be too small; otherwise, there will be a significant mutual interference. Based on this, referring to... Figure 4 , Figure 4 for Figure 1An enlarged schematic diagram of the middle pad 30 shows that in existing display panel designs, a small number (e.g., one or two) of invalid pads 304 are usually set between the first pad 301 connected to the first power line 31 and the second pad 302 connected to the second power line 32. Since the number of these invalid pads 304 is small, they cannot be used in practice. Therefore, the invalid pads 304 do not actually effectively connect any circuit devices, but only serve to separate the first pad 301 and the second pad 302, increasing the distance between the first pad 301 and the second pad 302, thereby avoiding mutual interference between the voltage signals transmitted by the first power line 31 and the second power line 32.

[0053] However, as described in the foregoing embodiments, in this embodiment, by making the distance between the second end 31b of the first power line and the second end 32b of the second power line greater than the distance between the first end 31a of the first power line and the first end 32a of the second power line, the distance between the pad 30 connected to the first power line 31 and the first pad 301 and the second pad 302 connected to the second power line 32 can be increased. Therefore, more pads 30 can be provided on the first pad 301 and the second pad 302 (relative to the number of existing invalid pads 304). Based on this, as... Figure 5 As shown, Figure 5 for Figure 2 An enlarged schematic diagram of the middle pad 30 section. (See diagram below.) Figure 5 As shown, in some embodiments, a plurality of third pads 303 are disposed between the second pad 302 and the first pad 301, and the plurality of third pads 303 are used to provide detection signals to the display panel. In this way, equivalent to a conventional display panel, the number of effective pads can be increased, thereby providing more sufficient signal transmission.

[0054] Furthermore, the third pad 303 includes a CellTest (CT) pad and / or a Touch (TP) detection pad, which can be selected and configured according to actual needs. The CellTest pad is used to provide a CellTest signal, and the TouchDetection pad is used to provide a TouchDetection signal. Thus, it is possible to enhance the CellTest signal, enhance the TouchDetection signal, or enhance both the CellTest signal and the TouchDetection signal simultaneously, depending on actual needs.

[0055] In addition, it should be noted that, besides the structures mentioned in the above embodiments, the display panel also includes other structures necessary to realize its functions, but the present invention does not need to improve them, so they will not be described one by one.

[0056] Exemplary display module

[0057] This invention also provides a display module, which includes the display panel described in any of the above embodiments. The display module may further include a cover plate, an optical adhesive layer and a polarizer disposed on the light-emitting side of the display panel, as well as a support film, composite tape and protective sealant disposed on the backlight side of the display panel.

[0058] Exemplary display device

[0059] This invention also provides a display device, which includes the display panel or display module described in any of the above embodiments. Figure 6 As shown, Figure 6 This is a schematic diagram of a display device provided in one embodiment of the present invention. The display device can be a smartphone, tablet computer, digital camera, etc.

[0060] This document describes exemplary embodiments with reference to plan views as idealized exemplary drawings. In the drawings, the sizes of the areas are enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as limited to the shapes of the areas shown herein, but rather include shape deviations caused, for example, by manufacturing processes. For example, etched areas shown as rectangular would typically have curved features. Therefore, the areas shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0061] Unless otherwise defined, the technical or scientific terms used in the embodiments of this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in the embodiments of this invention do not indicate any order, quantity, or importance, but are merely used to avoid confusion of the constituent elements.

[0062] Unless the context otherwise requires, throughout this specification, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of this specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples," etc., are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

Claims

1. A display panel, characterized in that, It includes a display area and a non-display area disposed on at least one side of the display area; the non-display area includes a bending area and a binding area disposed on the side of the bending area away from the display area; The bonding area is provided with a plurality of pads; the non-display area is provided with a first power line and a second power line extending through the bending area to the bonding area, and the first power line and the second power line are respectively electrically connected to the plurality of pads in the bonding area; Both the first power line and the second power line include a first end located in the bending area and a second end electrically connected to the pad; wherein the distance between the second end of the first power line and the second end of the second power line is greater than the distance between the first end of the first power line and the first end of the second power line. The line width at the second end of the first power line is greater than the line width at the first end, and / or the line width at the second end of the second power line is greater than the line width at the first end.

2. The display panel according to claim 1, characterized in that, The first power line includes a first sub-line, a second sub-line, and a third sub-line. The first sub-line includes a first end of the first power line, and the first sub-line is electrically connected to the third sub-line through the second sub-line. The third sub-line is electrically connected to a plurality of pads in the bonding area. The first sub-line is parallel to the third sub-line.

3. The display panel according to claim 2, characterized in that, The distance from the third sub-line to the second power line is greater than the distance from the first sub-line to the second power line.

4. The display panel according to claim 1, characterized in that, The second power line includes a fourth sub-line, a fifth sub-line, and a sixth sub-line. The fourth sub-line includes a first end of the second power line, and the fourth sub-line is electrically connected to the sixth sub-line through the fifth sub-line. The sixth sub-line is electrically connected to a plurality of pads in the bonding area. The line width of the fifth sub-line is greater than that of the fourth sub-line.

5. The display panel according to claim 1, characterized in that, The pads include a plurality of first pads connected to the first power line, a plurality of second pads connected to the second power line, and a third pad disposed between the second pads and the first pads, the third pad being used to provide a detection signal to the display panel.

6. The display panel according to claim 5, characterized in that, The third pad includes a screen detection pad and / or a touch detection pad, wherein the screen detection pad is used to provide screen detection signals and the touch detection pad is used to provide touch detection signals.

7. The display panel according to claim 1, characterized in that, The first power line is a negative power line, the second power line is a positive power line, and the line width of the second end of the second power line is greater than the line width of the second end of the first power line.

8. The display panel according to claim 7, characterized in that, The number of pads connected to the second power line is greater than the number of pads connected to the first power line.

9. A display module, characterized in that, Includes the display panel as described in any one of claims 1-8.

10. A display device, characterized in that, Includes the display module as described in claim 9.

Images