Display panel and display device

Abstract

The utility model discloses a display panel and a display device. The display panel binding area is provided with a plurality of binding terminals, the test area is provided with a plurality of test terminals, the cutting channel area is provided with connecting wires, the connecting wires are connected with the binding terminals and the test terminals, the connecting wires comprise two power supply wire groups and a plurality of signal wires, each power supply wire group comprises a plurality of power supply wires, and each signal wire group comprises a plurality of signal wires. The binding terminals comprise first binding terminals and second binding terminals, the test terminals comprise first test terminals and second test terminals, one power supply wiring group corresponds to one first binding terminal and one first test terminal, and each power supply wiring group is respectively connected with the corresponding first binding terminal and the corresponding first test terminal. The display panel disclosed by the utility model can effectively prevent a breaking point from appearing outside the cutting channel area, and avoid the problem that the function of the display panel is influenced due to increased line impedance caused by stripping of line metal outside the cutting channel area.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to a display panel and a display device. Background Art

[0002] During the manufacturing process of a display panel, lighting detection is performed to detect defects such as dark dots, bright dots, dark lines, and bright lines in the display panel. After the lighting detection is completed, cutting is performed along the MDL (Module) cutting line on the display panel to cut off the area where the test terminals are located.

[0003] Metal connection traces are provided in the cutting channel area for connecting the test terminals and the circuit board bonding terminals. When cutting along the cutting line, the metal connection traces in the cutting channel area are not easily broken during the cutting process. However, under the action of the cutting force, the breaking points of the metal connection traces are prone to uneven distribution, and even the breaking points may appear outside the cutting channel area, resulting in situations such as metal peeling off of the circuit outside the cutting channel area. After peeling off, the lack of metal will cause too large line impedance and affect the function of the display panel. Summary of the Utility Model

[0004] The utility model provides a display panel and a display device to solve the problem that when cutting along the cutting channel area in the prior art, the line impedance increases due to the metal peeling off of the circuit outside the cutting channel area, affecting the function of the display panel.

[0005] According to one aspect of the utility model, a display panel is provided. The display panel is divided into a display area, a bonding area located on one side of the display area, a cutting channel area located on the side of the bonding area away from the display area, and a test area located on the side of the cutting channel area away from the bonding area. The bonding area is provided with a plurality of bonding terminals, the test area is provided with a plurality of test terminals, and the cutting channel area is provided with connection traces. The connection traces connect the bonding terminals and the test terminals;

[0006] The connection traces include two groups of power trace groups and a plurality of signal traces. Each group of power trace groups includes a plurality of power traces. The bonding terminals include a first bonding terminal and a second bonding terminal, and the test terminals include a first test terminal and a second test terminal. One group of power trace groups corresponds to one first bonding terminal and one first test terminal. Each group of power trace groups is respectively connected to the corresponding first bonding terminal and the corresponding first test terminal. One signal trace corresponds to one second bonding terminal and one second test terminal. Each signal trace is respectively connected to the corresponding second bonding terminal and the corresponding second test terminal. The two groups of power trace groups are respectively located on both sides of the plurality of signal traces;

[0007] Optionally, in the direction along the thickness of the display panel, the display panel sequentially includes a glass substrate, a buffer layer, a first insulating layer, a first metal layer, and a second insulating layer which are stacked. In the bonding area and the testing area of the display panel, there are further a second metal layer disposed on the second insulating layer away from the first metal layer, a third insulating layer disposed on the second metal layer away from the second insulating layer, and a planarization layer disposed on the third insulating layer away from the second metal layer. The second metal layer extends to the edge of the dicing channel area, the third insulating layer extends into the dicing channel area and covers the side of the second metal layer and the second insulating layer, and the planarization layer extends to the edge of the dicing channel area. The bonding terminals, the testing terminals, and the connection traces are all located on the first metal layer.

[0008] Optionally, the line width of the signal trace is less than the width of the second bonding terminal or the second testing terminal.

[0009] Optionally, the connection trace is formed by a plurality of patterned units connected end to end in a diagonal line.

[0010] Optionally, the patterned unit is one or more of a rectangular wire frame, a diamond wire frame, an elliptical wire frame, or a polygonal wire frame.

[0011] Optionally, the width of the second bonding terminal or the second testing terminal is 10 - 30 μm, and the line width of the signal trace is 5 - 10 μm.

[0012] Optionally, the line width of the power supply trace is less than or equal to 30 μm.

[0013] Optionally, the distance between two adjacent connection traces is 10 - 20 μm.

[0014] Optionally, the width of the dicing channel area is 100 μm.

[0015] According to another aspect of the present invention, a display device is provided, including the display panel described in any one of the above.

[0016] The technical solution of the embodiment of the present invention, by splitting a wider power supply trace into multiple narrower power supply traces, on the basis of not changing the total line width of the power supply trace, the narrower power supply traces are more likely to break under the action of the cutting force, which can effectively avoid the break point from appearing outside the dicing channel area and avoid the problem that the increase in line impedance caused by the metal peeling of the circuit outside the dicing channel area affects the function of the display panel.

[0017] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 FIG. 1 is a schematic structural diagram of a display panel in the related art;

[0020] Figure 2 FIG. 2 is a schematic structural diagram of a display panel provided by an embodiment of the present utility model;

[0021] Figure 3 FIG. 3 Figure 2 is a sectional view along the dashed line aa' in FIG. 2;

[0022] Figure 4 FIG. 4 is a schematic structural diagram of a connection trace provided by an embodiment of the present utility model;

[0023] Figures 5A - 5D FIG. 5 is an example diagram of the force when the connection trace provided by the embodiment of the present utility model is cut along the scribe line area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to enable those skilled in the art to better understand the solution of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of the present utility model are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] Figure 1 is a schematic structural diagram of a display panel in the related art, as Figure 1 shown, the display panel is divided into a display area AA', a bonding area BB' located on one side of the display area, a scribe line area CC' located on the side of the bonding area BB' away from the display area AA', and a test area DD' located on the side of the scribe line area CC' away from the bonding area BB'. The bonding area BB' is provided with a plurality of bonding terminals 20', the test area DD' is provided with a plurality of test terminals 30', the scribe line area CC' is provided with connection traces 40', and the connection traces 40' connect the bonding terminals 20' and the test terminals 30'. The connection traces 40' include two power traces 41' and a plurality of signal traces 42'. The bonding terminals 20' include a first bonding terminal 21' and a second bonding terminal 22'. The test terminals 30 include a first test terminal 31' and a second test terminal 32'. One power trace 41' corresponds to a first bonding terminal 21' and a first test terminal 31', and each power trace 41' is respectively connected to the corresponding first bonding terminal 21' and the corresponding first test terminal 31'. One signal trace 42' corresponds to a second bonding terminal 22' and a second test terminal 32', and each signal trace 42' is respectively connected to the corresponding second bonding terminal 22' and the corresponding second test terminal 32'. The two power traces 41' are respectively located on both sides of the plurality of signal traces 42'. In the related art, the width of the power trace 41' in the scribe line area CC' is relatively wide, usually more than 200 μm. When cutting along the scribe line, the cutting force acts on the side of the glass substrate away from the buffer layer. When the cutting force penetrates into the power trace 41' along the thickness direction of the display panel, the relatively wide power trace 41' is not easily broken. The power trace 41' is easily pulled and broken under the action of the cutting force, and the distribution of break points is uneven, and even the break points appear outside the scribe line area CC', resulting in situations such as metal peeling of the circuit outside the scribe line area. After peeling, the metal loss will cause an increase in the circuit impedance and affect the function of the display panel.

[0027] Based on the above technical problems, an embodiment of the present utility model provides a display panel. The display panel is divided into a display area, a bonding area located on one side of the display area, a dicing channel area located on the side of the bonding area away from the display area, and a test area located on the side of the dicing channel area away from the bonding area. The bonding area is provided with a plurality of bonding terminals, the test area is provided with a plurality of test terminals, and the dicing channel area is provided with connection traces. The connection traces connect the bonding terminals and the test terminals. The connection traces include two groups of power traces and a plurality of signal traces. Each group of power traces includes a plurality of power traces. The bonding terminals include a first bonding terminal and a second bonding terminal. The test terminals include a first test terminal and a second test terminal. One group of power traces corresponds to a first bonding terminal and a first test terminal. Each group of power traces is respectively connected to the corresponding first bonding terminal and the corresponding first test terminal. One signal trace corresponds to a second bonding terminal and a second test terminal. Each signal trace is respectively connected to the corresponding second bonding terminal and the corresponding second test terminal. The two groups of power traces are respectively located on both sides of the plurality of signal traces.

[0028] Adopting the above technical solution, the single power trace with a relatively wide width in the dicing channel area is split into a plurality of power traces with relatively narrow widths. The power traces with relatively narrow widths are more likely to break under the action of the dicing force, which can effectively avoid the break point from appearing outside the dicing channel area and avoid the problem that the line impedance increases due to the metal peeling of the line outside the dicing channel area, affecting the function of the display panel.

[0029] The above is the core idea of this application. Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] Figure 2 A schematic structural diagram of a display panel provided by an embodiment of the present utility model Figure 3 is Figure 2 a cross-sectional view along the dotted line aa' in Figure 2 and Figure 3, the display panel 10 is divided into a display area AA, a bonding area BB on one side of the display area AA, a scribe line area CC on the side of the bonding area BB away from the display area AA, and a test area DD on the side of the scribe line area CC away from the bonding area BB. The bonding area BB is provided with a plurality of bonding terminals 20, the test area DD is provided with a plurality of test terminals 30, and the scribe line area CC is provided with connection traces 40. The connection traces 40 connect the bonding terminals 20 and the test terminals 30. The connection traces 40 include two groups of power traces 41 and a plurality of signal traces 42. Each group of power traces 41 includes a plurality of power traces 411. The bonding terminals 20 include a first bonding terminal 21 and a second bonding terminal 22. The test terminals 30 include a first test terminal 31 and a second test terminal 32. One group of power traces 41 corresponds to a first bonding terminal 21 and a first test terminal 31. Each group of power traces 41 is respectively connected to the corresponding first bonding terminal 21 and the corresponding first test terminal 31. One signal trace 42 corresponds to a second bonding terminal 22 and a second test terminal 32 respectively. Each signal trace 42 is respectively connected to the corresponding second bonding terminal 22 and the corresponding second test terminal 32. The two groups of power traces 41 are respectively located on both sides of the plurality of signal traces 42.

[0031] Specifically, the connection traces 40 are made of a metal material. Preferably, the material of the connection traces 40 may include molybdenum (Mo). The connection traces 40 are used to connect the test terminals and the circuit board bonding terminals during detection processes such as lighting detection, and break under the action of the force along the scribe line area during cutting after the detection is completed, so as to cut off the area where the test terminals are located. In the embodiment of the present invention, by setting each group of power traces 41 to include a plurality of power traces 411, one group of power traces 41 corresponds to a first bonding terminal 21 and a first test terminal 31, and each group of power traces 41 is respectively connected to the corresponding first bonding terminal 21 and the corresponding first test terminal 31, the relatively wide power traces in the display panel are split into multiple power traces with a relatively narrow width. Without changing the total width of the power traces, the power traces with a relatively narrow width are more likely to break under the action of the cutting force, which can effectively avoid the break point from appearing outside the scribe line area and avoid the problem that the line impedance increases due to the metal peeling of the line outside the scribe line area, affecting the function of the display panel. Optionally, in other embodiments, the line width of the power traces 411 is less than or equal to 30 μm. It is easy to understand that Figure 3 The number of power traces 411 shown in each group of power traces 41 is only for illustrative purposes and is not a limitation on the number of power traces in the power trace group. In other embodiments, each group of power trace groups may include other numbers of power traces, and this embodiment does not limit this.

[0032] The display panel provided by the embodiment of the present utility model is divided into a display area, a bonding area located on one side of the display area, a dicing channel area located on the side of the bonding area away from the display area, and a test area located on the side of the dicing channel area away from the bonding area. The bonding area is provided with a plurality of bonding terminals, the test area is provided with a plurality of test terminals, and the dicing channel area is provided with connection traces. The connection traces connect the bonding terminals and the test terminals. The connection traces include two groups of power traces and a plurality of signal traces. Each group of power traces includes a plurality of power traces. The bonding terminals include a first bonding terminal and a second bonding terminal. The test terminals include a first test terminal and a second test terminal. One group of power traces corresponds to a first bonding terminal and a first test terminal. Each group of power traces is respectively connected to the corresponding first bonding terminal and the corresponding first test terminal. One signal trace corresponds to a second bonding terminal and a second test terminal. Each signal trace is respectively connected to the corresponding second bonding terminal and the corresponding second test terminal. The two groups of power traces are respectively located on both sides of the plurality of signal traces. By splitting the relatively wide power traces into multiple power traces with a relatively narrow width, the display panel provided by the embodiment of the present utility model can effectively avoid the break point from appearing outside the dicing channel area and avoid the problem that the line impedance increases due to the metal peeling of the line outside the dicing channel area, which affects the function of the display panel, on the basis of not changing the total width of the power traces.

[0033] Continue to refer to Figure 2 , in the direction along the thickness of the display panel 10, the display panel 10 sequentially includes a glass substrate 11, a buffer layer 12, a first insulating layer 13, a first metal layer 14, and a second insulating layer 15 which are stacked. In the bonding area BB and the test area DD of the display panel 10, it further includes a second metal layer 16 disposed on the second insulating layer 15 away from the first metal layer 14, a third insulating layer 17 disposed on the second metal layer 16 away from the second insulating layer 15, and a planarization layer 18 disposed on the third insulating layer 17 away from the second metal layer 16. The second metal layer 16 extends to the edge of the dicing channel area CC. The third insulating layer 17 extends into the dicing channel area CC and covers the side of the second metal layer 16 and the second insulating layer 15. The planarization layer 18 extends to the edge of the dicing channel area CC. The bonding terminals 20, the test terminals 30, and the connection traces 40 are all located on the first metal layer 14.

[0034] Continue to refer to Figure 3, on the basis of the above embodiments, the line width of the signal trace 42 is smaller than the width of the second bonding terminal 22 or the second test terminal 32. Optionally, the line width of the signal trace 42 is 5 - 10 μm, and the width of the second bonding terminal 22 or the second test terminal 32 is 10 - 30 μm. By setting the line width of the signal trace to be smaller than the width of the second bonding terminal or the second test terminal, the signal trace is more likely to break under the action of the cutting force, which can effectively avoid the break point from appearing outside the scribe lane area, avoid the peeling of the line metal outside the scribe lane area, and avoid the short circuit of the signal line caused by the lapping of the peeled metal wire between the signal lines of the display panel, thus avoiding the problem of affecting the function of the display panel.

[0035] Figure 4 A schematic structural diagram of a connection trace provided by an embodiment of the present invention is shown together with Figure 2 and Figure 3 , the connection trace 40 is formed by a plurality of patterned units 400 connected end to end by diagonals. Optionally, the patterned unit 400 is a rectangular wire frame.

[0036] Figures 5A - 5D An example diagram of the force on the connection trace when it is cut along the scribe lane area provided by an embodiment of the present invention is shown with reference to Figure 5A , when cutting along the cutting line L in Figure 5A , the connection trace will be subjected to a pulling force extending along the direction of the connection trace at the cutting line, Figure 5A Taking the force with the direction towards the test terminal 30 and the magnitude of √2a when cutting along the cutting line L as an example for illustration, Figure 5B and Figure 5D show the schematic diagrams of the magnitude and direction of the pulling force at the cutting line when the same magnitude and direction of force act on different cutting positions of the connection trace as shown in Figure 4 , which are shown together with reference to Figure 4 , Figure 5B and Figure 5D , when cutting along the cutting line L1, the direction of the total pulling force at the cutting line of the connection trace is towards the test terminal 30, and the magnitude is √2a. Then, the cutting force at the cutting line L1 will be decomposed along the sides of the patterned unit 400, and the magnitude of the force on one of the sides of the patterned unit 400 after decomposition is a, Figure 5C shows Figure 5BSchematic diagram of the magnitude and direction of the force after the cutting force is decomposed again at the turning point of the patterning unit 400, that is, the cutting force received at the cutting line L1 will be decomposed along the edge of the patterning unit 400, and then the force will be decomposed again at the turning point of the patterning unit 400, and the magnitude of the decomposed force will gradually decrease. That is, it is formed by arranging the connecting traces 40 with a plurality of diagonal lines connected end to end. When cutting along the cutting line L1, the force received by the connecting trace 40 at the cutting line L1 is the largest. In the direction away from the cutting line L1, the force received by the connecting trace 40 will gradually decrease with the turning of the patterning unit 400. Therefore, the connecting trace 40 is more likely to break at the cutting line L1, which can effectively prevent the break point from appearing outside the cutting channel area, avoid the metal peeling of the line outside the cutting channel area, and the metal loss after peeling will cause an increase in the line impedance, or avoid the short circuit of the signal line caused by the metal wire after peeling overlapping between the display panel signal lines, which affects the function of the display panel.

[0037] It is easy to understand that Figure 4 An exemplary embodiment of the patterning unit being a rectangular wire frame is given. In other embodiments, the patterning unit can be one or more of a rectangular wire frame, a diamond wire frame, an elliptical wire frame, or a polygonal wire frame.

[0038] Optionally, based on the above embodiment, the distance between two adjacent connecting traces 40 is 10 - 20 μm. By reasonably setting the distance between the connecting traces, it is possible to reduce the size of the display panel on the basis of preventing signal interference or short circuit between the connecting traces.

[0039] Optionally, based on the above embodiment, the width of the cutting channel area CC is 100 μm.

[0040] Based on the same concept, the embodiment of the present invention also provides a display device. The display device includes the display panel described in any embodiment of the present invention. Therefore, the display device provided by the embodiment of the present invention has the corresponding beneficial effects of the display panel provided by the embodiment of the present invention, which will not be elaborated here. Exemplarily, the display device can be an electronic device such as a mobile phone, a computer, a smart wearable device (for example, a smart watch), and a vehicle-mounted display device, etc. The embodiment of the present invention does not limit this.

[0041] It should be understood that various forms of the processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0042] The above specific embodiments do not constitute a limitation on the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A display panel, characterized in that, The display panel is divided into a display area, a bonding area located on one side of the display area, a dicing channel area located on the side of the bonding area away from the display area, and a test area located on the side of the dicing channel area away from the bonding area. A plurality of bonding terminals are provided in the bonding area, a plurality of test terminals are provided in the test area, and connection traces are provided in the dicing channel area. The connection traces connect the bonding terminals and the test terminals; The connection traces include two sets of power traces and a plurality of signal traces. Each set of power traces includes a plurality of power traces. The bonding terminals include a first bonding terminal and a second bonding terminal. The test terminals include a first test terminal and a second test terminal. One set of power traces corresponds to one first bonding terminal and one first test terminal. Each set of power traces is respectively connected to the corresponding first bonding terminal and the corresponding first test terminal. One signal trace corresponds to one second bonding terminal and one second test terminal. Each signal trace is respectively connected to the corresponding second bonding terminal and the corresponding second test terminal. The two sets of power traces are respectively located on both sides of the plurality of signal traces.

2. The display panel according to claim 1, wherein In the direction along the thickness of the display panel, the display panel sequentially includes a glass substrate, a buffer layer, a first insulating layer, a first metal layer, and a second insulating layer which are stacked. In the bonding area and the test area of the display panel, a second metal layer provided on the second insulating layer away from the first metal layer, a third insulating layer provided on the second metal layer away from the second insulating layer, and a planarization layer provided on the third insulating layer away from the second metal layer are further included. The second metal layer extends to the edge of the dicing channel area. The third insulating layer extends into the dicing channel area and covers the side of the second metal layer and the second insulating layer. The planarization layer extends to the edge of the dicing channel area. The bonding terminals, the test terminals, and the connection traces are all located on the first metal layer.

3. The display panel according to claim 1, characterized in that, The line width of the signal trace is smaller than the width of the second bonding terminal or the second test terminal.

4. The display panel according to claim 1, characterized in that, The connection traces are formed by a plurality of patterned units connected end to end diagonally.

5. The display panel according to claim 4, wherein The patterned unit is one or more of a rectangular wire frame, a diamond wire frame, an elliptical wire frame, or a polygonal wire frame.

6. The display panel according to claim 3, wherein The width of the second bonding terminal or the second test terminal is 10 - 30 μm, and the line width of the signal trace is 5 - 10 μm.

7. The display panel according to claim 1, wherein The line width of the power trace is less than or equal to 30 μm.

8. The display panel according to claim 1, wherein The distance between two adjacent connection traces is 10 - 20 μm.

9. The display panel according to claim 1, wherein The width of the dicing channel area is 100 μm.

10. A display device, characterized in that, Including the display panel according to any one of claims 1 - 9.

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