Display panel, detection method thereof, detection jig and display device

Abstract

The application provides a display panel and a detection method, a detection jig and a display device thereof, and relates to the technical field of display, and is used for effectively improving the detection effect of the manufacturing quality of the connecting line. The display panel comprises a substrate, a signal line, a connecting electrode and a connecting line. The substrate comprises a first surface and a second surface opposite to each other and a first side surface connected between the first surface and the second surface. The signal line is located on the first surface. The connecting electrode is located on the first surface and is electrically connected with the signal line. The connecting line is electrically connected with the connecting electrode and comprises a side edge wire part located on the first side surface. The connecting electrode comprises a first connecting electrode. The first connecting electrode comprises a first region and a second region. The first connecting electrode is connected with the connecting line in the first region. And / or, the position of the first connecting electrode connected with the connecting line is located in a non-middle region of the first connecting electrode.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display panel and its testing method, testing fixture, and display device. Background Technology

[0002] In one related design of a display panel, signal lines on the front side of the substrate extend to the lower edge and connect to a connection electrode. Connecting lines are attached to the connection electrode and extend from the front and sides of the substrate to the back side, where they are electrically connected to driving structures such as driver chips and printed circuit boards. This structure helps to achieve ultra-narrow bezels or bezel-less designs in display panels.

[0003] To address the issue of low yield rates in connector manufacturing, short circuits and open circuits in the connectors are typically tested before the display panel leaves the factory.

[0004] Currently, the common method involves additionally setting two shorted first test electrodes on the front side of the substrate. Test connection lines are attached to each of these first test electrodes, extending to the back side of the substrate and electrically connecting to two second test electrodes. During testing, a testing fixture inserts pins into the second test electrodes on the back side. By measuring parameters such as contact resistance, the connection status of the test connection lines is determined, thereby estimating the overall fabrication quality of the connection lines. However, this testing method has poor detection efficiency, significantly limiting the detection of defective lines. Summary of the Invention

[0005] This invention provides a display panel and its testing method, testing fixture, and display device, which effectively improve the testing effect on the quality of connecting wire manufacturing.

[0006] In a first aspect, embodiments of the present invention provide a display panel, comprising: The substrate includes opposing first and second surfaces, and a first side surface connected between the first and second surfaces; The signal line is located on the first surface; A connecting electrode is located on the first surface and electrically connected to the signal line; The connecting line is electrically connected to the connecting electrode and includes a side trace portion located on the first side. The connecting electrode includes a first connecting electrode, which includes a first region and a second region. The first connecting electrode is connected to the connecting line in the first region, and / or the position of the first connecting electrode connected to the connecting line is located in a non-middle region of the first connecting electrode.

[0007] Secondly, based on the same inventive concept, embodiments of the present invention also provide a method for detecting a display panel, applied to the aforementioned display panel, comprising: A testing fixture is provided, the testing fixture including a first testing point, a second testing point, a first probe electrically connected to the first testing point, and a second probe electrically connected to the second testing point; The display panel is placed face up in the testing fixture. The first probe is positioned on one side of the first surface and in contact with the second area of ​​the first connecting electrode. The second probe is positioned on one side of the second surface and provides a detection voltage to the connecting line. The connection status of the connecting line is determined based on the resistance between the first detection point and the second detection point.

[0008] Thirdly, based on the same inventive concept, embodiments of the present invention also provide a testing fixture for testing the aforementioned display panel, including: First and second testing points; A first probe electrically connected to a first detection point and a second probe electrically connected to a second detection point, wherein the first probe is used to contact the second area of ​​the first connecting electrode in the display panel, and the second probe is used to apply a detection voltage to the connecting line in the display panel.

[0009] Fourthly, based on the same inventive concept, embodiments of the present invention also provide a display device, including the aforementioned display panel.

[0010] The technical solution provided by the embodiments of the present invention has the following beneficial effects: In this embodiment of the invention, the connecting electrode includes a first connecting electrode. Only a portion (first region) of the first connecting electrode is used to connect with the connecting wire, while a portion (second region) remains unused. This unused portion provides a contact point for the probe when detecting the connection of the connecting wire. When detecting the connection status of the connecting wire, the probe is inserted into the second region of the first connecting electrode to detect the connection status of the connecting wire corresponding to the first connecting electrode. This structure allows for individual detection of multiple connecting wires, accurately determining the connection status of each wire. This enables targeted remediation of connecting wires with connection problems, resulting in a superior detection effect for the display panel. Furthermore, this structure prevents the probe from damaging the connecting wire during detection, thus avoiding damage to the connecting wire and ensuring reliable connection with the first connecting electrode. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of a display panel provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the front of a display panel provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the back of a display panel provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of a detection method for a display panel provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of another structure of the display panel provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of a pixel circuit structure provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of a connecting electrode provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of another structure of the connecting electrode provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of another structure of the connecting electrode provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of another structure of the display panel provided in an embodiment of the present invention; Figure 11 This is another schematic diagram of the back of the display panel provided in an embodiment of the present invention; Figure 12 This is another schematic diagram of the back of the display panel provided in an embodiment of the present invention; Figure 13 This is yet another schematic diagram of the back of the display panel provided in an embodiment of the present invention; Figure 14 This is a top view of the first connecting electrode provided in an embodiment of the present invention; Figure 15 for Figure 14 A sectional view along the A1-A2 direction; Figure 16 This is a cross-sectional schematic diagram of a display panel provided in an embodiment of the present invention; Figure 17 This is another structural schematic diagram of the front of the display panel provided in an embodiment of the present invention; Figure 18 This is a schematic diagram of another structure of the display panel provided in an embodiment of the present invention; Figure 19 This is a schematic diagram of another structure of the connecting electrode provided in an embodiment of the present invention; Figure 20 This is yet another schematic diagram of the back of the display panel provided in an embodiment of the present invention; Figure 21 This is a schematic diagram of a display device provided in an embodiment of the present invention; Figure 22 This is another structural schematic diagram of the display device provided in an embodiment of the present invention. Detailed Implementation

[0013] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0014] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0016] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0017] This invention provides a display panel, which can be a light-emitting diode (LED) or organic light-emitting diode (OLED) type display panel, such as a mini LED or micro LED display panel.

[0018] Figure 1 This is a schematic diagram of a display panel provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the front of a display panel provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the back side of a display panel provided in an embodiment of the present invention. Figures 1-3As shown, the display panel provided in this embodiment of the invention includes a substrate 1. The substrate 1 includes a first surface 2 and a second surface 3 facing each other, and a first side surface 4 connecting the first surface 2 and the second surface 3. The first surface 2 and the second surface 3 are disposed opposite each other in the thickness direction of the display panel. The first surface 2 is the surface of the substrate 1 near the light-emitting side of the display panel, that is, the front side of the substrate 1, and the second surface 3 is the surface of the substrate 1 away from the light-emitting side of the display panel, that is, the back side of the substrate 1.

[0019] The display panel also includes signal lines 5 and connecting electrodes 6, both located on the first surface 2. Signal lines 5 may include various types of traces used to drive the display, such as data lines, power lines, and reset lines; connecting electrodes 6 are electrically connected to signal lines 5 and are located close to the first side surface 4.

[0020] The display panel also includes a connecting line 7 electrically connected to the connecting electrode 6. The connecting line 7 includes a side trace portion 8 located on the first side surface 4. Specifically, the connecting line 7 overlaps with the connecting electrode 6 on the first surface 2, extends from the first surface 2 and the first side surface 4 to the second surface 3, and is electrically connected to driving structures (not shown in the figure) such as driving chips and printed circuit boards on the second surface 3 to establish a signal transmission path between the driving structure and the signal line 5.

[0021] The connecting electrode 6 includes the first connecting electrode 9.

[0022] The first connecting electrode 9 includes a first region 10 and a second region 11. The first connecting electrode 9 is connected to the connecting line 7 in the first region 10. That is, the first connecting electrode 9 is in contact with the connecting line 7 in the first region 10, but not in contact with the connecting line 7 in the second region 11.

[0023] And / or, the position in the first connecting electrode 9 that connects to the connecting line 7 is located in a non-central region of the first connecting electrode 9. That is, the position in the first connecting electrode 9 that connects to the connecting line 7 is offset from the central axis of the first connecting electrode 9. For example, see... Figure 1 The position of the first connecting electrode 9 connected to the connecting line 7 is slightly to the left of the first connecting electrode 9, thus leaving a portion of the right side of the first connecting electrode 9 that does not contact the connecting line 7; or, the position of the first connecting electrode 9 connected to the connecting line 7 is slightly to the right of the first connecting electrode 9, thus leaving a portion of the left side of the first connecting electrode 9 that does not contact the connecting line 7.

[0024] In this embodiment of the invention, the connecting electrode 6 includes a first connecting electrode 9. Only a portion of the first connecting electrode 9 is used to connect with the connecting line 7, while a portion of the portion is left unused. This unused portion is used to provide a contact point for the probe when the connecting line is being tested.

[0025] Figure 4 This is a schematic diagram of a detection method for a display panel provided in an embodiment of the present invention, combined with... Figures 2-4 When testing the connection status of the connecting cable, firstly, the display panel 100 is placed in the testing fixture 200. The testing fixture 200 has a first testing point 300, a second testing point 400, a first probe 500 electrically connected to the first testing point 300, and a second probe 600 electrically connected to the second testing point 400. Then, the first probe 500 is inserted into the second region 11 of the first connecting electrode 9, and a testing voltage is applied to the connecting cable 7 using the second probe 600. Based on information such as the resistance between the first testing point 300 and the second testing point 400, the connection status of the connecting cable 7 is determined to be normal.

[0026] Using the display panel provided in this embodiment of the invention, the second region 11 of the first connecting electrode 9 provides a contact point for the probe. When detecting the connection status of the connecting lines, the probe is inserted into the second region 11 of the first connecting electrode 9, thereby detecting the connection status of the connecting line 7 corresponding to the first connecting electrode 9. This structure can realize the individual detection of multiple connecting lines 7, accurately determine the connection status of each connecting line 7, and then provide targeted remediation for connecting lines 7 with connection problems. This display panel can have a better detection effect. Moreover, this structure does not affect the connecting line 7 when performing detection, avoiding damage to the connecting line 7 by the probe and affecting the reliability of the connection with the first connecting electrode 9.

[0027] Furthermore, during testing, this type of structure uses pins on both sides of the display panel, combined with... Figure 4 The display panel is placed face up in the testing fixture, with the first probe 500 piercing the front and the second probe 600 piercing the back. The display panel does not need to be flipped to face up, thus avoiding structural damage caused by the flipping process.

[0028] Figure 5 This is a schematic diagram of another structure of the display panel provided in an embodiment of the present invention. In one feasible implementation, such as Figure 5 As shown, the display panel also includes a pixel circuit 12 and a data line D. The data line D is electrically connected to the pixel circuit 12 and is used to provide data voltage to the pixel circuit 12.

[0029] The display panel also includes multiple gating units 13, each with an input terminal and multiple output terminals. The input terminal is electrically connected to the source signal line 14, and the multiple output terminals are electrically connected to multiple data lines D. Specifically, each gating unit 13 includes multiple gating transistors. The gates of the multiple gating transistors are connected to multiple control lines, the first terminals of the multiple gating transistors are electrically connected to the same source signal line 14, and the second terminals of the multiple gating transistors are electrically connected to multiple data lines D. During the driving process, the multiple control lines provide enable levels in a time-division manner, controlling the multiple gating switches in the gating unit 13 to be turned on in a time-division manner, thereby transmitting the data signals in the source signal line 14 to the connected data lines D in a time-division manner.

[0030] The signal line 5 includes a source signal line 14, and at least a portion of the first connecting electrode 9 is electrically connected to the source signal line 14.

[0031] The display panel employs a gated design for the data lines D, which significantly reduces the number of connection electrodes 6 required in the display panel. For example, if the display panel has 720 data lines D, these 720 data lines D would originally require 720 corresponding connection electrodes 6. However, by introducing a 1-to-3 gated design, only 240 connection electrodes are needed for the 240 source signal lines 14, greatly reducing the number of connection electrodes 6 in the display panel.

[0032] Reducing the number of connecting electrodes 6 frees up a significant amount of space. This space can be used to widen the connecting electrodes 6, giving them independent connecting line overlap areas (first region 19) and probe contact areas (second region 11). This means more connecting electrodes 6 can serve as first connecting electrodes 9, enabling individual detection of the connecting lines 7. In other words, the significant reduction in the number of connecting electrodes 6 allows for the design of larger first connecting electrodes 9, with a wider second region 11 for probe contact, reducing probe alignment difficulty and consequently simplifying the design and manufacturing of the detection fixture.

[0033] Furthermore, see again Figure 5 The pixel circuit 12 includes a pulse width modulation (PWM) module 15 and a pulse amplitude modulation (PAM) module 16. Accordingly, the data line D includes a first data line D1 electrically connected to the pulse width modulation module 15 and a second data line D2 electrically connected to the pulse amplitude modulation module 16.

[0034] The pulse width modulation module 15 is configured to adjust brightness by changing the duty cycle of the pulse signal, and the pulse amplitude modulation module 16 is configured to adjust brightness by changing the amplitude of the pulse signal. The pixel circuit 12 adopts a PWM+PAM design to achieve more precise brightness adjustment, thereby enabling the display panel to achieve more accurate color performance.

[0035] The first data line D1 is electrically connected to the gating unit 13.

[0036] In the relevant design, the first data line D1 corresponding to the pulse width modulation module 15 is directly driven by the driver chip. That is, each first data line D1 needs to correspond to a connection electrode 6, and then be connected to the driver chip through the connection line 7. Because the resolution of the current display panel is relatively high, the number of first data lines D1 is very large, for example, up to more than 1,000, which in turn leads to a large number of connection electrodes 6.

[0037] By electrically connecting the first data line D1 to the gating unit 13 and adopting a gating design for the first data line D1, the number of connecting electrodes 6 in the display panel can be greatly reduced, thereby freeing up more space to meet the widening requirements of the connecting electrodes 6, so that more connecting electrodes 6 can be widened, or the connecting electrodes 6 can achieve a greater degree of widening and have a larger area to contact the probe.

[0038] Figure 6 This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention. The following is an example of such a circuit. Figure 6 Taking the structure shown as an example, the circuit structure of pixel circuit 12 will be illustrated.

[0039] The pixel circuit 12 includes a pulse width modulation module 15 and a pulse amplitude modulation module 16.

[0040] The pulse width modulation module 15 may include: First driving transistor M1.

[0041] The first gate reset transistor M2 has its gate electrically connected to the first scan line PWM-S1, its first terminal electrically connected to the first reset signal line PWM-REF, and its second terminal electrically connected to the gate of the first drive transistor M1.

[0042] The first data writing transistor M3 has its gate electrically connected to the second scan line PWM-S2, its first terminal electrically connected to the first data line D1, and its second terminal electrically connected to the first terminal of the first driving transistor M1.

[0043] The first compensation transistor M4 has its gate electrically connected to the second scan line PWM-S2, its first terminal electrically connected to the second terminal of the first driving transistor M1, and its second terminal electrically connected to the gate of the first driving transistor M1.

[0044] The first capacitor C1 has its first plate electrically connected to the sweep frequency signal line SWEEP, and its second plate electrically connected to the gate of the first driving transistor M1.

[0045] The first light-emitting control transistor M5 has its gate electrically connected to the first light-emitting control signal line PWM-EM, its first terminal electrically connected to the first fixed potential signal line PWM-vdd, and its second terminal electrically connected to the first terminal of the first driving transistor M1.

[0046] The gate of the second light-emitting control transistor M6 is electrically connected to the first light-emitting control signal line PWM-EM, and the first terminal is electrically connected to the second terminal of the first driving transistor M1.

[0047] The pulse amplitude modulation module 16 may include: The gate of the second driving transistor M7 is electrically connected to the second electrode of the second light-emitting control transistor M6.

[0048] The second gate reset transistor M8 has its gate electrically connected to the third scan line PAM-S1, its first terminal electrically connected to the second reset signal line PAM-REF, and its second terminal electrically connected to the gate of the second drive transistor M7.

[0049] The second data writing transistor M9 has its gate electrically connected to the fourth scan line PAM-S2, its first terminal electrically connected to the second data line D2, and its second terminal electrically connected to the first terminal of the second driving transistor M7.

[0050] The second compensation transistor M10 has its gate electrically connected to the fourth scan line PAM-S2, its first terminal electrically connected to the second terminal of the second driving transistor M7, and its second terminal electrically connected to the gate of the second driving transistor M7.

[0051] The anode reset transistor M11 has its gate electrically connected to the fourth scan line PAM-S2, its first electrode electrically connected to the second reset signal line PAM-REF, and its second electrode electrically connected to the light-emitting element 50.

[0052] The third light-emitting control transistor M12 has its gate electrically connected to the second light-emitting control transistor PAM-EM, its first terminal electrically connected to the second fixed potential signal line PAM-vdd, and its second terminal electrically connected to the first terminal of the second driving transistor M7.

[0053] The fourth light-emitting control transistor M13 has its gate electrically connected to the second light-emitting control transistor PAM-EM, its first electrode electrically connected to the second electrode of the second driving transistor M7, and its second electrode electrically connected to the light-emitting element 50.

[0054] The second capacitor C2 has its first plate electrically connected to the second fixed potential signal line PAM-vdd, and its second plate electrically connected to the gate of the second driving transistor M7.

[0055] It should be noted that, Figure 6 This is only a schematic diagram of one circuit structure for the pixel circuit 12. In other optional embodiments of the present invention, the pixel circuit 12 may also adopt other circuit structures.

[0056] In one feasible implementation, see Figure 1 The first side 4 is located on one side of the display panel in the first direction x, and the first area 10 and the second area 11 in the first connecting electrode 9 are arranged along the second direction y, which intersects with the first direction x. That is, the first side 4 is located on one side of the display panel in the vertical direction, and the first area 10 and the second area 11 in the first connecting electrode 9 are arranged in the horizontal direction.

[0057] See Figure 1 The connecting electrode 6 includes a first side and a second side in the first direction x. The end of the signal line 5 extends from the first side of the connecting electrode 6 to connect with the connecting electrode 6, and the connecting line 7 is led out from the second side of the connecting electrode 6 and extends to the first side 4. In the first connecting electrode 9, the first region 10 and the second region 11 are arranged along the second direction y. The position of the second region 11 does not conflict with the position of the end of the signal line 5 and the lead-out position of the connecting line 7, making it easier to contact the probe.

[0058] It should be noted that the boundary between the first side and the first surface can be seen in some top views.

[0059] Figure 7 This is a schematic diagram of a connection electrode 6 provided in an embodiment of the present invention. In one feasible implementation, such as... Figure 7 As shown, the length of the first connecting electrode 9 in the second direction y is L1, and the length d of the portion of the connecting line 7 located on the first surface 2 in the second direction y is... For example, L1 is twice or more than d.

[0060] And / or, in the first connecting electrode 9, the length L12 of the second region 11 in the second direction y is greater than or equal to the length L11 of the first region 10 in the second direction y.

[0061] Explanation of the lengths of Zone 10 and Zone 11 in the second direction y: See Figure 7 The first connecting electrode 9 includes a first edge 01 and a second edge 02 opposite to each other in the second direction y. The first edge 01 is the edge of the first region 10, and the distance between the connecting line 7 and the first edge 01 is d1.

[0062] There is a dividing line 00 between the first zone 10 and the second zone 11. Of course, this dividing line 00 does not actually exist. It is just a fictitious line used to divide the positions of the first zone 10 and the second zone 11. The distance between the dividing line 00 and the connecting line 7 is also d1.

[0063] Of course, the distance between this dividing line 00 and the outer edge of the first zone 10 on the side opposite to the connecting line 7 will not be less than the width of the connecting line in the second direction y.

[0064] The distance between the dividing line 00 and the first edge 01 can be considered as the length L11 of the first sub-region in the second direction y, and the distance between the dividing line 00 and the second edge 02 can be considered as the length L12 of the second sub-region in the second direction y.

[0065] When the first connecting electrode 9 meets the above-mentioned size design, the first connecting electrode 9 can be considered as being at least twice as wide as the original size of the connecting electrode. The second region of the first connecting electrode 9 has a larger lateral dimension, providing a larger probe contact area and reducing the difficulty of probe alignment. This design is more suitable for panel structures with the aforementioned gate unit 13. In this panel structure with a gate design, the number of connecting electrodes 6 is very small, and the first connecting electrode 9 can more easily meet the above-mentioned size design requirements.

[0066] In one feasible implementation, see Figure 7 The length of the first connecting electrode 9 in the second direction y is L1, where L1 > 3 μm.

[0067] The line width of the connecting line 7 can be above 2μm, and L1>3μm. Under the premise of ensuring a complete overlap width with the connecting line 7, a sufficiently wide blank area can be left as the second area 11 to provide enough contact points for the probe, reduce the difficulty of probe alignment, and avoid inaccurate probe alignment that could damage the connecting line 7.

[0068] In this embodiment of the invention, the specific value of L1 can be related to the actual line width of the connecting line 7. As mentioned above, L1 can be 1.5 times or more than the line width d of the connecting line 7. For example, when the actual line width of the connecting line 7 is 30 μm, L1 can be designed to be 54 μm or more.

[0069] In one feasible implementation, see Figure 7 The length of the first connecting electrode 9 in the second direction y is L1, and the length of the first connecting electrode 9 in the first direction x is L2. .

[0070] When the ratio of the horizontal and vertical dimensions of the first connecting electrode 9 meets the above range, the horizontal dimension of the first connecting electrode 9 is larger, and the first connecting electrode 9 has a probe contact area with sufficient area, which reduces the difficulty of probe alignment and avoids inaccurate probe alignment from damaging the connecting wire 7.

[0071] In this embodiment of the invention, the length L2 of the first connecting electrode 9 in the first direction x can be greater than 5 μm, so that the first connecting electrode 9 and the connecting line 7 have sufficient overlap length in the first direction x to ensure connection strength. The specific value of L2 can be related to the space that the display panel can provide for the connecting electrode 6 at its lower edge. If there is enough space at the lower edge of the display panel to accommodate the connecting electrode 6 in the first direction x, then the length L2 of the first connecting electrode 9 in the first direction x can reach tens or hundreds of micrometers, for example, L2 can be 100 μm.

[0072] And, see also Figure 7 The spacing L3 between adjacent connecting electrodes 6 can be greater than 3 μm to ensure sufficient interval between them. This prevents short circuits between the connecting line 7 and adjacent connecting electrodes 6 due to process errors or other factors, and also prevents probes from sticking to adjacent connecting electrodes 6 due to alignment accuracy issues. The specific value of L3 can be related to the number of connecting electrodes 6. When the number of connecting electrodes 6 is small, L3 can be larger, for example, reaching tens of micrometers, such as 50 μm. When the number of connecting electrodes 6 is large, L3 can be smaller.

[0073] Figure 8 This is a schematic diagram of another structure of the connecting electrode 6 provided in an embodiment of the present invention. In one feasible implementation, such as Figure 8 As shown, the connecting electrode 6 also includes a second connecting electrode 17, the length of which in the second direction y is less than the length of which in the second direction y is the length of which ... the first connecting electrode 9 in the second direction y.

[0074] For example, in one configuration, the second connecting electrode 17 is a connecting electrode with its original dimensions and not widened, i.e., see [link to configuration]. Figure 8The distance between the two opposite edges of the second connecting electrode 17 in the second direction y and the connecting line 7 is d1.

[0075] In this structure, only the connecting electrodes 6 corresponding to some signal lines 5 used for transmitting more important signals can be widened, thereby enabling individual detection of the connecting lines 7 corresponding to these connecting electrodes 6, ensuring the reliability of important signal transmission. Furthermore, the connection status of the connecting lines 7 corresponding to the second connecting electrode 17 can be predicted based on the connection status of these connecting lines 7.

[0076] This configuration allows for widening only a portion of the connecting electrodes 6, meaning that only a portion of the connecting electrodes 6 can be used as the first connecting electrode 9, thus alleviating the pressure on the overall lateral space occupied by the connecting electrodes 6.

[0077] In one configuration, the length of the second connecting electrode 17 in the second direction y is L4, and the length of the first connecting electrode 9 in the second direction y is L1, where L1 ≥ For example, L1 is twice or more than L4.

[0078] Figure 9 This is a schematic diagram of another structure of the connecting electrode 6 provided in an embodiment of the present invention. Alternatively, in another feasible embodiment, such as Figure 9 As shown, the length L12 of the second region 11 in the second direction y is less than the length L11 of the first region 10 in the second direction y, and / or, the length L12 of the second region 11 in the second direction y is less than the length d of the portion of the connecting line 7 located on the first surface 2 in the second direction y.

[0079] The explanation of the lengths of the first region 10 and the second region 11 in the second direction y has been described in the above embodiments and will not be repeated here.

[0080] In the first connecting electrode 9 of this structure, the second region 11 is narrower. The slightly narrower design of the second region 11, while ensuring normal contact with the probe, can alleviate the pressure on the overall lateral space occupied by the connecting electrode 6. This design is more suitable for panel structures with a large number of connecting electrodes 6.

[0081] Figure 10 This is another structural schematic diagram of the display panel provided in an embodiment of the present invention. In one feasible implementation, such as... Figure 10 As shown, in the signal line 5 electrically connected to the first connecting electrode 9, the end of the signal line 5 is connected to the first connecting electrode 9 at the second region 11.

[0082] The first connecting electrode 9 has a signal line 5 placed on it at the second region 11, which can improve the structural support of the first connecting electrode 9 and increase the strength when the probe is pressed. Moreover, with this structure, the detection point during detection starts directly from the end of the signal line 5, avoiding the overlapping area between the first connecting electrode 9 and the connecting line 7, and can provide more direct detection of the signal line 5.

[0083] In one feasible implementation, see Figure 3 The display panel also includes a bonding electrode 18, which is located on the second surface 3 and electrically connected to the connecting line 7. The bonding electrode 18 is also used to connect to the pins of driving structures such as driver chips and printed circuit boards.

[0084] In one detection method, combined with Figure 3 and Figure 4 When testing the connection status of the connecting wire, the second probe 600 of the testing fixture 200 is attached to the binding electrode 18, and the second probe 600 applies a testing voltage to the connecting wire 7 through the binding electrode 18.

[0085] However, considering that directly inserting the second probe 600 onto the bonding electrode 18 may damage the bonding electrode 18, which in turn may affect the subsequent bonding of the bonding electrode 18 to the driving structure.

[0086] In this regard, the present invention further proposes that, in a feasible implementation, some detection electrodes electrically connected to the bonding electrode 18 can be added.

[0087] Figure 11 This is another schematic diagram of the back of the display panel provided in an embodiment of the present invention. Figure 12 This is another schematic diagram of the back of the display panel provided in an embodiment of the present invention. Figure 11 and Figure 12 As shown, the display panel also includes a detection electrode 19, which is located on the second surface 3 and electrically connected to the bonding electrode 18. The detection electrode 19 is not connected to the pins of the driving structure and is used to contact the probe during detection.

[0088] Based on the above structure, during the detection process, the second probe 600 of the detection fixture 200 can be attached to the detection electrode 19, and a detection voltage is applied to the connecting line 7 through the detection electrode 19. In this way, the probe does not need to contact the bonding electrode 18, thus avoiding damage to the bonding electrode 18 and affecting the reliability of the connection with the drive structure.

[0089] Furthermore, since the detection electrode 19 is not connected to the pins of the driving structure, its design parameters are not limited by the pin design parameters in the driving structure, allowing for greater flexibility. For example, see again... Figure 11 and Figure 12The distance between adjacent detection electrodes 19 is greater than the distance between adjacent binding electrodes 18, and / or the area of ​​detection electrode 19 is greater than the area of ​​binding electrode 18. This reduces the difficulty of aligning the second probe 600, thereby reducing the difficulty of designing and manufacturing the detection fixture.

[0090] In one feasible implementation, see again Figure 11 and Figure 12 The detection electrode 19 is located on the side of the bonding electrode 18 away from the first side 4, thereby avoiding conflict between the wiring positions of the detection electrode 19 and the connecting line 7, and avoiding conflict between the wiring positions of the connection between the detection electrode 19 and the bonding electrode 18 and the connecting line 7.

[0091] Figure 13 This is yet another schematic diagram of the back of the display panel provided in an embodiment of the present invention. Alternatively, in another feasible embodiment, such as Figure 13 As shown, the display panel also includes a bonding electrode 18, which is located on the second surface 3 and electrically connected to the connecting line 7. The bonding electrode 18 includes a third region 20 and a fourth region 21, and the bonding electrode 18 is connected to the pin of the driving structure in the third region 20.

[0092] In this structure, the bonding electrode 18 is only used to contact the pins of the driving structure in a certain area, with a portion of the area left unused. This unused area is used to provide contact points for the probe when testing the connection line. During the testing process, the second probe 600 of the testing fixture 200 is attached to the fourth area 21 of the bonding electrode 18. The second probe 600 does not contact the position where it connects to the pins of the driving structure, thus avoiding affecting the reliability of the connection between the bonding electrode 18 and the driving structure.

[0093] Figure 14 This is a top view of the first connecting electrode 9 provided in an embodiment of the present invention. Figure 15 for Figure 14 A sectional view along the A1-A2 direction. Figure 16 This is a cross-sectional schematic diagram of a display panel provided in an embodiment of the present invention. In one feasible implementation, such as... Figures 14-16 As shown, the first connecting electrode 9 in the first region 10 includes at least two stacked first metal portions 22, with adjacent first metal portions 22 electrically connected through vias. The first connecting electrode 9 in the second region 11 includes at least two stacked second metal portions 23, with adjacent second metal portions 23 electrically connected through vias. Each of the at least two first metal portions 22 is connected to a second metal portion 23 on the same layer.

[0094] For example, the display panel includes a first metal layer m1, a second metal layer m2, a third metal layer m3, and a fourth metal layer m4 stacked along a direction away from the substrate 1. The first connection electrode 9 includes four first metal portions 22 in the first region 10, which are respectively located in the four metal layers; the first connection electrode 9 includes four second metal portions 23 stacked in the second region 11, which are respectively located in the four metal layers.

[0095] Theoretically, the first connecting electrode 9 is provided with only one second metal part 23 in the second region 11, and the second metal part 23 is connected to the first connecting part, so that the second region 11 and the connecting line 7 can be connected, thereby enabling the second region 11 to undertake the detection function.

[0096] However, in this embodiment of the invention, the first connecting electrode 9 includes a plurality of second metal parts 23 in the second region 11, and at least two of the second metal parts 23 are connected to the first metal parts 22 in the same layer. This arrangement can improve the connection strength between the metals inside the first connecting electrode 9 and reduce the overall load on the first connecting electrode 9.

[0097] Furthermore, see again Figure 14 and Figure 15 The first metal part 22 includes a first sub-metal part 24, which is the uppermost metal part of the first connecting electrode 9 and can be located in the fourth metal layer m4. The first sub-metal part 24 overlaps with the connecting line 7. The first sub-metal part 24 is connected to the second metal part 23 in the same layer, so that the uppermost metal of the first connecting electrode 9 is connected into one piece in the first region 10 and the second region 11.

[0098] The first metal portion 22 includes a second sub-metal portion 25. The second sub-metal portion 25 and the signal line 5 electrically connected to the first connecting electrode 9 are on the same layer. The second sub-metal portion 25 may be located in the second metal layer m2. The second sub-metal portion 25 and the second metal portion 23 on the same layer are connected, thereby making the metal on the same layer as the signal line 5 in the first connecting electrode 9 connected in the first region 10 and the second region 11, reducing the load on this part of the metal and improving the signal transmission quality.

[0099] Figure 17 This is another structural schematic diagram of the front of the display panel provided in an embodiment of the present invention. Figure 18 This is a schematic diagram of another structure of the display panel provided in an embodiment of the present invention. In one feasible implementation, such as Figure 17 and Figure 18 As shown, the display panel also includes a first trace 26, which is located on the first surface 2 and electrically connected to the connecting electrode 6. The first trace 26 is located on the side of the connecting electrode 6 near the first side 4 and its end is exposed at the edge of the display panel.

[0100] In the first connecting electrode 9 and the first trace 26 of the electrical connection, the first trace 26 is located on the side of the connecting electrode 6 in the first region 10 near the first side 4.

[0101] Regarding the first trace 26, in one scenario, during the manufacturing process of the display panel, the connecting electrode 6 extends a trace below to the outside of the cutting line to introduce external signals for conducting some tests during the process. After the tests are completed, the display panel is cut along the cutting line. The portion of this trace outside the cutting line is cut off, while the portion inside the cutting line is retained in the display panel. This retained portion is the aforementioned first trace 26.

[0102] The first trace 26 is located on the side of the first connecting electrode 9 in the first region 10 near the first side 4. When the connecting line 7 extends toward the first side 4, it will contact the end of the first trace 26, thereby improving the connection strength between the connecting line 7 and the first connecting electrode 9.

[0103] Figure 19 This is a schematic diagram of another structure of the connecting electrode 6 provided in an embodiment of the present invention. In one feasible implementation, such as Figure 19 As shown, the first side 4 is located on one side of the display panel in the first direction x.

[0104] The display panel has a first central axis 04 extending along a first direction x. In the first connecting electrodes 9 located on both sides of the first central axis 04, the first regions 10 of each first connecting electrode 9 are all located on the side of the second region 11 closer to the first central axis 04, or the first regions 10 of each first connecting electrode 9 are all located on the side of the second region 11 farther from the first central axis 04. In this case, the first connecting electrodes 9 on both sides of the first central axis 04 are symmetrically designed, which is more convenient and aesthetically pleasing.

[0105] Further, see Figure 19 The display panel may also include a dummy electrode 27, which is arranged along the second direction y with the connecting electrode 5. This dummy electrode 27 acts as a virtual pad and is not connected to the signal line 5, the first trace 26, or the connecting line 7. It is used to prevent etching abnormalities during the manufacturing process to ensure process stability. Furthermore, the dummy electrode 27 can be located in the center of the panel, overlapping the first central axis 04. The first connecting electrode 9 on the left and right sides of the dummy electrode 27 exhibits the aforementioned symmetrical design. This results in a more regular distribution of electrodes at the lower edge of the display panel and a more aesthetically pleasing trace distribution.

[0106] Figure 20 This is yet another schematic diagram of the back of a display panel provided in an embodiment of the present invention. In one possible implementation, such as Figure 20As shown, the first side 4 is located on one side of the display panel in the first direction x.

[0107] The second surface 3 includes a fan-out region 28 and a non-fan-out region 29. The portion of the connecting line 7 located on the second surface 3 is in the fan-out region 28, and the non-fan-out region 29 is located on at least one side of the fan-out region 28 in the second direction y, which intersects with the first direction x. The non-fan-out region 29 includes a second trace 30.

[0108] As the connecting line 7 extends from the first side surface 4 to the second surface 3, it converges at the location of the bonding electrode 18 in the fan-out region 28. The connecting line 7 is only distributed locally on the second surface 3. By setting some second traces 30 in the blank area on one side of the fan-out region 28, the etching uniformity of this area can be improved during the process.

[0109] In one configuration, the second surface 3 includes a fan-out region 28 and two non-fan-out regions 29, with the two non-fan-out regions 29 located on either side of the fan-out region 28 in the second direction y.

[0110] Based on the same inventive concept, embodiments of the present invention also provide a method for detecting a display panel, which is applied to the aforementioned display panel.

[0111] Combination Figures 1-4 The detection method includes: providing a detection fixture 200, the detection fixture 200 including a first probe 500 electrically connected to a first detection point 300, a second detection point 400, and a second probe 600 electrically connected to the second detection point 400.

[0112] The testing fixture 200 has a space for accommodating the display panel, the first probe 500 is a top probe located on the upper side of the space, and the second probe 600 is a bottom probe located on the lower side of the space.

[0113] The detection method further includes: placing the display panel 100 face up in the detection fixture, positioning the first probe 500 on one side of the first surface 2 and contacting the second area 11 of the first connecting electrode 9, positioning the second probe 600 on one side of the second surface 3 and providing a detection voltage to the connecting line 7, and judging the connection status of the connecting line 7 based on the resistance between the first detection point 300 and the second detection point 400.

[0114] Using the technical solution provided in this embodiment of the invention, the second region 11 of the first connecting electrode 9 provides a contact point for the probe. When detecting the connection status of the connecting wires, the probe is inserted into the second region 11 of the first connecting electrode 9, thereby detecting the connection status of the connecting wire 7 corresponding to the first connecting electrode 9. This structure can realize the individual detection of multiple connecting wires 7, accurately determine the connection status of each connecting wire 7, and then provide targeted remediation for connecting wires 7 with connection problems, resulting in a better detection effect for the display panel. Moreover, this structure does not affect the connecting wires 7 during detection, avoiding damage to the connecting wires 7 by the probe and affecting the reliability of the connection with the first connecting electrode 9.

[0115] Furthermore, during testing, this type of structure uses pins on both sides of the display panel, combined with... Figure 4 The display panel is placed face up in the testing fixture, with the first probe 500 piercing the front and the second probe 600 piercing the back. The display panel does not need to be flipped to face up, thus avoiding structural damage caused by the flipping process.

[0116] Further, see Figure 4 The testing fixture 200 may also include a flexible pad 700, on which the display panel is placed when it is placed in the testing fixture 200, thereby protecting the display panel from damage.

[0117] Furthermore, combined Figure 11 and Figure 12 The display panel also includes a bonding electrode 18 and a detection electrode 19. The bonding electrode 18 is located on the second surface 3 and is electrically connected to the connecting line 7. The detection electrode 19 is located on the second surface 3 and is electrically connected to the bonding electrode 18.

[0118] When the display panel is placed in the testing fixture, the second probe 600 contacts the testing electrode 19, and a testing voltage is applied to the connecting line 7 through the testing electrode 19.

[0119] In this way, the probe does not need to contact the bonding electrode 18, thus avoiding damage to the bonding electrode 18 and affecting the reliability of the connection with the drive structure.

[0120] Moreover, since the detection electrode 19 is not connected to the pins of the driving structure, the design parameters of the detection electrode 19 are not limited by the design parameters of the pins in the driving structure, which makes it more flexible. This reduces the difficulty of aligning the second probe 600, and thus reduces the design and manufacturing difficulty of the detection fixture 200.

[0121] Based on the same inventive concept, this embodiment of the invention also provides a testing fixture for testing the aforementioned display panel.

[0122] Combination Figures 2-4 The testing fixture 200 includes a first testing point 300, a second testing point 400, a first probe 500 electrically connected to the first testing point 300, and a second probe 600 electrically connected to the second testing point 400. The first probe 500 is used to contact the second area 11 of the first connecting electrode 9 in the display panel 100, and the second probe 600 is used to apply a testing voltage to the connecting line 7 in the display panel 100.

[0123] During the testing process, the connection status of the connecting line 7 can be determined based on information such as the resistance between the first testing point 300 and the second testing point 400.

[0124] Based on the foregoing analysis, when the aforementioned display panel 100 is tested using this testing fixture 200, the display panel has pins inserted on both sides. The display panel is placed directly face up in the testing fixture, with the first probe 500 inserting pins on the front and the second probe 600 inserting pins on the back. The display panel does not need to be flipped to face up, thus avoiding structural damage caused by the flipping process.

[0125] Based on the same inventive concept, embodiments of the present invention also provide a display device, such as... Figure 21 and Figure 22 As shown, Figure 21 This is a schematic diagram of a display device provided in an embodiment of the present invention. Figure 22 This is another structural schematic diagram of a display device provided in an embodiment of the present invention, which includes the above-described display panel 100.

[0126] The display device provided in this embodiment of the invention may be Figure 21 Examples shown include electronic devices such as mobile phones, tablets, laptops, e-readers, or televisions. Alternatively, it could be... Figure 22 The outdoor large screen and other splicing display devices shown include at least two display panels.

[0127] 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 within the scope of protection of the present invention.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized by, include: The substrate includes opposing first and second surfaces, and a first side surface connected between the first and second surfaces; The signal line is located on the first surface; A connecting electrode is located on the first surface and electrically connected to the signal line; The connecting line is electrically connected to the connecting electrode and includes a side trace portion located on the first side. The connecting electrode includes a first connecting electrode, which includes a first region and a second region. The first connecting electrode is connected to the connecting line in the first region, and / or the position of the first connecting electrode connected to the connecting line is located in a non-middle region of the first connecting electrode.

2. The display panel of claim 1, wherein, The display panel also includes: Pixel circuit and data line electrically connected to said pixel circuit; Multiple gating units, each gating unit including an input terminal and multiple output terminals, wherein the input terminal is electrically connected to the source signal line, and the multiple output terminals are respectively electrically connected to multiple data lines; The signal line includes a source signal line, and at least a portion of the first connecting electrode is electrically connected to the source signal line.

3. The display panel according to claim 2, characterized in that, The pixel circuit includes a pulse width modulation module and a pulse amplitude modulation module. The data line includes a first data line and a second data line. The first data line is electrically connected to the pulse width modulation module, and the second data line is electrically connected to the pulse amplitude modulation module. The first data line is electrically connected to the gating unit.

4. The display panel according to claim 1, characterized in that, The first side is located on one side in a first direction of the display panel; In the first connecting electrode, the first region and the second region are arranged along a second direction, which intersects with the first direction.

5. The display panel according to claim 4, characterized in that, A length of the first connection electrode in the second direction is L1, and a length of a portion of the connection line located on the first surface in the second direction is d, ; And / or, in the first connecting electrode, the length of the second region in the second direction is greater than or equal to the length of the first region in the second direction.

6. The display panel according to claim 4, characterized in that, The length of the first connecting electrode in the second direction is L1, where L1 > 3 μm.

7. The display panel according to claim 4, characterized in that, A length of the first connection electrode in the second direction is L1, and a length of the first connection electrode in the first direction is L2. .

8. The display panel according to claim 4, characterized in that, The connecting electrode further includes a second connecting electrode, the length of which in the second direction is less than the length of which in the second direction is the first connecting electrode.

9. The display panel according to claim 4, characterized in that, The length of the second region in the second direction is less than the length of the first region in the second direction; And / or, the length of the second region in the second direction is less than the length of the portion of the connecting line located on the first surface in the second direction.

10. The display panel of claim 1, wherein, The display panel also includes: A bonding electrode is located on the second surface and electrically connected to the connecting wire; The detection electrode is located on the second surface and is electrically connected to the bonding electrode.

11. The display panel according to claim 10, characterized in that, The detection electrode is located on the side of the bonding electrode away from the first side.

12. The display panel according to claim 10, characterized in that, The distance between adjacent detection electrodes is greater than the distance between adjacent bonding electrodes, and / or the area of ​​the detection electrode is greater than the area of ​​the bonding electrode.

13. The display panel according to claim 1, characterized in that, The display panel further includes a bonding electrode, which is located on the second surface and electrically connected to the connecting line; The bonding electrode includes a third region and a fourth region, and the bonding electrode is connected to the pin of the drive structure in the third region.

14. The display panel according to claim 1, characterized in that, The first connecting electrode includes at least two stacked first metal portions in the first region, and the first connecting electrode includes at least two stacked second metal portions in the second region, wherein the at least two first metal portions are respectively connected to the second metal portions in the same layer.

15. The display panel according to claim 14, characterized in that, The first metal part includes a first sub-metal part, which overlaps with the connecting line, and the first sub-metal part is connected to a second metal part at the same layer. The first metal part includes a second sub-metal part, the second sub-metal part and the signal line electrically connected to the first connecting electrode are on the same layer, and the second sub-metal part and the second metal part on the same layer are connected.

16. The display panel according to claim 1, characterized in that, The display panel further includes a first trace, which is located on the first surface and electrically connected to the connection electrode. The first trace is located on the side of the connection electrode closer to the first side and its end is exposed at the edge of the display panel. In the first connecting electrode and the first trace in the electrical connection, the first trace is located on the side of the connecting electrode in the first region near the first side.

17. The display panel according to claim 1, characterized in that, The first side is located on one side in a first direction of the display panel; The display panel has a first central axis extending along the first direction. In the first connecting electrodes located on both sides of the first central axis, the first area of ​​the first connecting electrode is located on the side of the second area closer to the first central axis, or the first area of ​​the first connecting electrode is located on the side of the second area away from the first central axis.

18. The display panel according to claim 1, characterized in that, The first side is located on one side in a first direction of the display panel; The second surface includes a fan-out area and a non-fan-out area. The portion of the connecting line located on the second surface is located in the fan-out area. The non-fan-out area is located on at least one side of the fan-out area in a second direction. The non-fan-out area includes a second trace. The second direction intersects the first direction.

19. The display panel according to claim 1, characterized in that, In the signal line electrically connected with the first connecting electrode, an end of the signal line is connected with the first connecting electrode at the second area.

20. A method of detecting a display panel, the method comprising: applying a voltage to a display panel; and detecting a change in a current flowing through the display panel. The display panel according to any one of claims 1-19, comprising: A detection jig is provided, and the detection jig comprises a first detection point, a second detection point, a first probe electrically connected with the first detection point, and a second probe electrically connected with the second detection point; The display panel is placed in the detection jig with the front face upward, the first probe is positioned on one side of the first surface and in contact with the second area of the first connecting electrode, and the second probe is positioned on one side of the second surface and provides a detection voltage to the connecting line; and the connection state of the connecting line is determined according to the resistance between the first detection point and the second detection point.

21. The display panel detection method of claim 20, wherein The display panel further comprises a binding electrode and a detection electrode, the binding electrode is located on the second surface and electrically connected with the connecting line, and the detection electrode is located on the second surface and electrically connected with the binding electrode; When the display panel is placed in the detection jig, the second probe is in contact with the detection electrode, and the detection voltage is applied to the connecting line through the detection electrode.

22. An inspection fixture, comprising: A detection jig for detecting the display panel according to any one of claims 1-19, comprising: a first detection point and a second detection point; a first probe electrically connected with the first detection point and a second probe electrically connected with the second detection point, wherein the first probe is used to contact the second area of the first connecting electrode in the display panel, and the second probe is used to apply a detection voltage to the connecting line in the display panel.

23. A display device comprising: The display panel according to any one of claims 1-19.

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