Display panel

Abstract

The application discloses a display panel, which comprises a display area and a non-display area, the non-display area comprises a fan-out area and a bending area, the display panel comprises a substrate and an active layer arranged on the substrate, and further comprises a fan-out wire, at least one detection wire, a plurality of first connecting lines and at least one second connecting line. The detection wire comprises a first wire segment and a second wire segment, the second wire segment is located between the substrate and a film layer where the active layer is located, and the first wire segment and the second wire segment are electrically connected. The film layer where the first connecting line is located is located above the film layer where the fan-out wire is located, the first connecting line and the fan-out wire are electrically connected through a first connecting part penetrating between the first connecting line and the fan-out wire. The film layer where the second connecting line is located is located above the film layer where the first wire segment is located, and the second connecting line and the second wire segment are electrically connected through a second connecting part penetrating between the second connecting line and the second wire segment.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display panel. Background Technology

[0002] In the relevant solution, the display panel needs to undergo reliability testing after production. Due to the large pressure difference between the crack detection traces and the adjacent fan-out traces of the display panel, when the temperature and humidity of the working environment for reliability testing of the display panel are too high, moisture will enter the display panel, causing electrochemical corrosion of the crack detection traces in the display panel and resulting in electrical failure of the crack detection traces. Summary of the Invention

[0003] Embodiments of this application provide a display panel to improve the problem of electrical failure of the detection traces in the display panel.

[0004] In a first aspect, embodiments of this application provide a display panel, the display panel including a display area and a non-display area, the non-display area including a fan-out area and a bent area, the bent area being located on the side of the fan-out area away from the display area;

[0005] The display panel includes a substrate and an active layer disposed on the substrate, and the display panel further includes:

[0006] Multiple fan-out traces are provided in the fan-out area, and the film layer where the fan-out traces are located is located above the film layer where the active layer is located.

[0007] At least one detection trace, at least a portion of which is disposed in the fan-out area, the detection trace includes a first trace segment and a second trace segment, the first trace segment being located on a film layer above the active layer, the second trace segment being located between the substrate and the active layer, the first trace segment and the second trace segment being electrically connected, and in a top view of the display panel, the second trace segment partially overlaps with the fan-out trace;

[0008] Multiple first connecting lines, at least a portion of which are disposed in the bending region, the film layer containing the first connecting lines being located above the film layer containing the fan-out traces, and the first connecting lines and the fan-out traces being electrically connected via a first connecting portion penetrating between the first connecting lines and the fan-out traces; and

[0009] At least one second connecting line, at least a portion of which is disposed in the bending area, the film layer on which the second connecting line is located is located above the film layer on which the first trace segment is located, and the second connecting line and the second trace segment are electrically connected by a second connecting portion passing through the second connecting line and the second trace segment.

[0010] Furthermore, the display panel also includes a shielding metal layer, a first metal layer and a second metal layer disposed on the substrate. The film layer in which the shielding metal layer is located is below the film layer in which the active layer is located, the film layer in which the first metal layer is located is above the film layer in which the active layer is located, and the film layer in which the second metal layer is located is above the film layer in which the first metal layer is located.

[0011] The second trace segment is located in the film layer where the shielding metal layer is located, and the first trace segment is located in the film layer where the first metal layer or the second metal layer is located.

[0012] Furthermore, the display panel also includes a third metal layer, and the film layer containing the third metal layer is located on top of the film layer containing the second metal layer;

[0013] The second connecting line is located in the film layer where the third metal layer is located. The second connecting line is electrically connected to the second trace segment by segment through a first via in the film layer between the third metal layer and the shielding metal layer.

[0014] Furthermore, the first connecting line is located in the film layer where the third metal layer is located, the fan-out trace is located in the film layer where the first metal layer is located, and the first connecting line is electrically connected to the fan-out trace through a second via penetrating the film layer between the third metal layer and the first metal layer.

[0015] Furthermore, the first connecting line is located in the film layer where the third metal layer is located, the fan-out trace is located in the film layer where the second metal layer is located, and the first connecting line is electrically connected to the fan-out trace through a third via penetrating the film layer between the third metal layer and the second metal layer.

[0016] Furthermore, the first trace segment is located in the film layer where the first metal layer is located, and the first trace segment is electrically connected to the second trace segment through a fourth via that penetrates the film layer between the first metal layer and the shielding metal layer.

[0017] Furthermore, the first trace segment is located in the film layer where the second metal layer is located, and the first trace segment is electrically connected to the second trace segment through a fifth via that penetrates the film layer between the second metal layer and the shielding metal layer.

[0018] Furthermore, the second trace segment is located in the fan-out area.

[0019] Furthermore, the angle between the straight line containing the second routing segment and the straight line containing the fan-out routing is less than or equal to 45 degrees.

[0020] Furthermore, the voltage value of the signal transmitted by the second connecting line is different from the voltage value of the signal transmitted by the first connecting line.

[0021] The beneficial effects of this application are:

[0022] This application provides a display panel in which the detection trace includes a first trace segment and a second trace segment. The film layer containing the first trace segment is located above the film layer containing the active layer, and the second trace segment is located between the substrate and the film layer containing the active layer. The first trace segment and the second trace segment are electrically connected. At least a portion of the second connecting line is disposed in the bending area, and the film layer containing the second connecting line is located above the film layer containing the first trace segment. The second connecting line and the second trace segment are electrically connected through a second connecting portion penetrating between the second connecting line and the second trace segment. This allows the inorganic layer above the film layer of the second trace segment to act as a barrier against moisture, reducing the amount of moisture entering the water-absorbing organic planarization layer from the bending area and into the shielding metal layer. This improves the problem of electrochemical corrosion of the detection trace in the metal layer under the organic planarization layer due to the large pressure difference between the detection trace and the adjacent fan-out trace, which leads to the breakage of the detection trace and the electrical failure of the detection trace. Attached Figure Description

[0023] Figure 1 This is a top view of the display panel of this application;

[0024] Figure 2 This is a schematic diagram of the display panel of this application being infiltrated by moisture;

[0025] Figure 3 yes Figure 1 A schematic diagram of position A on the display panel shown;

[0026] Figure 4 yes Figure 3 A cross-sectional view of the non-display area BB′ of the display panel shown;

[0027] Figure 5 yes Figure 3 An enlarged view of position C in the non-display area of ​​the display panel shown;

[0028] Figure 6 yes Figure 5The cross-sectional view of position DD′ or EE′ in position C of the non-display area of ​​the display panel shown.

[0029] 100 - Display area; 200 - Non-display area; 210 - Fan-out area; 220 - Bending area; 300 - Fan-out trace; 400 - Detection trace; 410 - First trace segment; 420 - Second trace segment; 500 - First connecting line; 600 - Second connecting line.

[0030] 01-Substrate; 02-First insulating layer; 03-First barrier layer; 04-Shielding metal layer; 05-Second barrier layer; 06-Buffer layer; 07-Second insulating layer; 08-First metal layer; 09-Third insulating layer; 010-Second metal layer; 011-First interlayer insulating layer; 012-Fourth insulating layer; 013-Second interlayer insulating layer; 014-Third metal layer; 015-First planarization layer; 016-Second planarization layer.

[0031] 10 - Polarizing film layer; 20 - UV adhesive protective layer; 30 - Inorganic film layer; 40 - Organic planarization layer; 50 - Metal layer. Detailed Implementation

[0032] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. The technical solutions described below are for illustrative purposes only and should not be construed as limiting the scope of protection of this application.

[0033] Furthermore, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different technical features. The terms "multiple" and similar words indicate two or more unless otherwise expressly specified.

[0034] refer to Figure 1 An embodiment of this application provides a display panel, which includes a display area 100 and a non-display area 200. The non-display area 200 includes a fan-out area 210 and a bending area 220, with the bending area 220 located on the side of the fan-out area 210 away from the display area 100.

[0035] refer to Figure 2When the temperature and humidity of the working environment during reliability testing of the display panel are too high, the polarizing film layer 10 of the display panel shrinks, causing gaps to appear at the edges of the polarizing film layer 10 and the UV adhesive protective layer 20. This allows external moisture to enter the display panel through these gaps. Furthermore, the inorganic film layer 30 near the bending area 220 of the display panel is affected by the bending of the panel, causing changes in its film composition. The moisture entering the bending area 220 then permeates through the inorganic film layer 30 into the water-absorbing organic planarization layer 40. Simultaneously, this affects the panel crack detection (PCD, PanelCrack). The detection trace 400 of the crack detection circuit is located in the fan-out region 210 and also near the bend region 220. The second connection line 600 of the detection trace 400 of the crack detection circuit is a high potential voltage signal, while the adjacent fan-out trace 300 connected to the first connection line 500 is a low potential voltage signal. As a result, there is a large voltage difference between the detection trace 400 and the adjacent fan-out trace 300. The detection trace 400 located in the metal layer 50 under the organic planarization layer 40 undergoes electrochemical corrosion, causing the electrical failure of the crack detection trace 400.

[0036] refer to Figure 3 In this embodiment, the display panel includes a substrate 01 and an active layer disposed on the substrate 01. The display panel also includes a fan-out trace 300, at least one detection trace 400, multiple first connection lines 500 and at least one second connection line 600.

[0037] Specifically, the fan-out trace 300 is disposed in the fan-out region 210, and the film layer on which the fan-out trace 300 is located is above the film layer on which the active layer is located; at least a portion of the detection trace 400 is disposed in the fan-out region 210, and the detection trace 400 includes a first trace segment 410 and a second trace segment 420. The film layer on which the first trace segment 410 is located is above the film layer on which the active layer is located, and the second trace segment 420 is located between the substrate and the film layer on which the active layer is located. The first trace segment 410 and the second trace segment 420 are electrically connected. In the top view of the display panel, the second trace segment 420 partially overlaps with the fan-out trace 300; At least a portion of a connecting line 500 is disposed in the bending region 220. The membrane layer on which the first connecting line 500 is located is above the membrane layer on which the fan-out routing line 300 is located. The first connecting line 500 and the fan-out routing line 300 are electrically connected through a first connecting portion passing through the first connecting line 500 and the fan-out routing line 300. At least a portion of a second connecting line 600 is disposed in the bending region 220. The membrane layer on which the second connecting line 600 is located is above the membrane layer on which the first routing segment 410 is located. The second connecting line 600 and the second routing segment 420 are electrically connected through a second connecting portion passing through the second connecting line 600 and the second routing segment 420.

[0038] The detection trace 400 includes a first trace segment 410 and a second trace segment 420. The first trace segment 410 is located on a film layer above the active layer, and the second trace segment 420 is located between the substrate 01 and the active layer. The first trace segment 410 and the second trace segment 420 are electrically connected. At least a portion of the second connecting line 600 is located in the bending region 220. The film layer of the second connecting line 600 is located above the film layer of the first trace segment 410. The second connecting line 600 and the second trace segment 420 are connected by a through-type second connecting line. The second connection between line 600 and the second wiring segment 420 is electrically connected, so that the inorganic layer above the membrane layer of the second wiring segment 420 can block water vapor, reducing the amount of water vapor entering from the bending area 220 into the water-absorbing organic planarization layer and into the shielding metal layer 04. This improves the problem of the large pressure difference between the detection line 400 and the adjacent fan-out line 300, which causes electrochemical corrosion of the detection line 400 in the metal layer under the organic planarization layer, resulting in the breakage of the detection line 400 and the electrical failure of the detection line 400.

[0039] In this embodiment, one end of the fan-out trace 300 is electrically connected to the first connecting line 500, and the other end of the fan-out trace 300 is connected to the GOA circuit in the non-display area.

[0040] In this embodiment, the detection trace 400 is a crack detection trace.

[0041] In this embodiment, the active layer is made of molybdenum (Mo).

[0042] In this embodiment, in the top view of the display panel, the second connecting line 600 does not overlap with the first connecting line 500.

[0043] refer to Figures 3-6 In this embodiment, the display panel further includes a shielding metal layer 04, a first metal layer 08, and a second metal layer 010 disposed on the substrate 01. The film layer where the shielding metal layer 04 is located is below the film layer where the active layer is located, the film layer where the first metal layer 08 is located is above the film layer where the active layer is located, and the film layer where the second metal layer 010 is located is above the film layer where the first metal layer 08 is located. The second trace segment 420 is located on the film layer where the shielding metal layer 04 is located, and the first trace segment 410 is located on the film layer where the first metal layer or the second metal layer 010 is located.

[0044] refer to Figures 3-6In this embodiment, the display panel further includes a first insulating layer 02 and a first barrier layer 03. The first insulating layer 02 is disposed on the substrate 01, and the first barrier layer 03 is disposed on a surface of the first insulating layer 02 away from the substrate 01. By providing the first barrier layer 03, the first barrier layer 03 can block moisture and prevent moisture from entering the second trace segment 420 of the shielding metal layer 04, thereby further improving the problem of broken lines in the detection trace 400.

[0045] In this embodiment, the display panel further includes a second barrier layer 05, which is disposed on the first barrier layer 03 and covers the second trace segment 420. By setting the second barrier layer 05, the second barrier layer 05 can block moisture and prevent moisture from entering the second trace segment 420 of the shielding metal layer 04, thereby further improving the problem of broken wires in the detection trace 400.

[0046] In this embodiment, the first barrier layer 03 and the second barrier layer 05 are inorganic layers.

[0047] In this embodiment, the display panel further includes a buffer layer 06 and a second insulating layer 07. The buffer layer 06 is disposed on a surface of the second barrier layer 05 away from the substrate, and the second insulating layer 07 is disposed on a surface of the buffer layer 06 away from the substrate 01. The first metal layer 08 is disposed on a surface of the second insulating layer 07 away from the substrate 01.

[0048] In this embodiment, the display panel further includes a third insulating layer 09, which is disposed on a surface of the first metal layer 08 away from the substrate 01; wherein, the second metal layer 010 is disposed on a surface of the third insulating layer 09 away from the substrate 01.

[0049] refer to Figures 3-6 In this embodiment, the display panel further includes a third metal layer 014, the film layer on which the third metal layer 014 is located is located on the film layer on which the second metal layer 010 is located; the second connecting line 600 is located on the film layer on which the third metal layer 014 is located, and the second connecting line 600 is electrically connected to the second trace segment 420 through a first via penetrating the film layer between the third metal layer 014 and the shielding metal layer 04.

[0050] In this embodiment, the display panel further includes a first interlayer insulating layer 011, a fourth insulating layer 012, and a second interlayer insulating layer 013. The first interlayer insulating layer 011 covers the second metal layer 010. The fourth insulating layer 012 is disposed on a surface of the first interlayer insulating layer 011 away from the substrate, and the second interlayer insulating layer 013 is disposed on a surface of the fourth insulating layer 012 away from the substrate. A third metal layer 014 is disposed on a surface of the second interlayer insulating layer 013 away from the substrate 01.

[0051] refer to Figure 3 , Figure 4 and Figure 6 In this embodiment, the first connecting line 500 is located in the film layer where the third metal layer 014 is located, and the fan-out trace 300 is located in the film layer where the first metal layer 08 is located. The first connecting line 500 is electrically connected to the fan-out trace 300 through a second via that penetrates the film layer between the third metal layer 014 and the first metal layer 08.

[0052] refer to Figure 3 , Figure 4 and Figure 6 In this embodiment, the first connecting line 500 is located in the film layer where the third metal layer 014 is located, and the fan-out trace 300 is located in the film layer where the second metal layer 010 is located. The first connecting line 500 is electrically connected to the fan-out trace 300 through a third via that penetrates the film layer between the third metal layer 014 and the second metal layer 010.

[0053] In this embodiment, the first trace segment 410 is located in the film layer where the first metal layer 08 is located, and the first trace segment 410 is electrically connected to the second trace segment 420 through a fourth via that penetrates the film layer between the first metal layer 08 and the shielding metal layer 04.

[0054] In this embodiment, the first trace segment 410 is located in the film layer where the second metal layer 010 is located, and the first trace segment 410 is electrically connected to the second trace segment 420 through a fifth via that penetrates the film layer between the second metal layer 010 and the shielding metal layer 04.

[0055] In this embodiment, the second trace segment 420 is located in the fan-out area 210.

[0056] In this embodiment, the angle between the straight line containing the second routing segment 420 and the straight line containing the fan-out routing 300 is less than or equal to 45 degrees.

[0057] In this embodiment, the voltage value of the signal transmitted by the second connection line 600 is different from the voltage value of the signal transmitted by the first connection line 500.

[0058] In this embodiment, the signal transmitted by the second connecting line 600 is a high-potential voltage signal, and the signal transmitted by the first connecting line 500 is a low-potential voltage signal.

[0059] refer to Figure 4 or Figure 6 In this embodiment, the display panel further includes a first planarization layer 015 and a second planarization layer 016. The first planarization layer 015 is disposed on a surface of the third metal layer 014 away from the substrate 01, and the second planarization layer 016 is disposed on a surface of the first planarization layer 015 away from the substrate 01.

[0060] The specific technical solution of this application is as follows:

[0061] When the temperature and humidity of the working environment during reliability testing of the display panel are too high, the polarizing film layer 10 of the display panel shrinks, causing gaps to appear at the edges of the polarizing film layer 10 and the UV adhesive protective layer 20. This allows external moisture to enter the display panel through these gaps. Furthermore, the inorganic film layer 30 near the bending area of ​​the display panel is affected by the bending of the display panel, causing changes in the film quality of the inorganic film layer 30. The moisture entering the bending area then permeates through the inorganic film layer into the water-absorbing organic planarization layer 40, namely the first planarization layer 015 and the second planarization layer 016 of this application. Simultaneously, panel crack detection (PCD) is performed on the display panel. The detection trace 400 of the crack detection circuit is located in the fan-out region 210 and also near the bending region 220. The second connection line 600 of the detection trace 400 of the crack detection circuit is a high potential voltage signal, and the adjacent fan-out trace 300 connected to the first connection line 500 is a low potential voltage signal. As a result, there is a large voltage difference between the detection trace 400 and the adjacent fan-out trace 300. Since the metal layer 50 under the organic planarization layer 40, i.e. the third metal layer 014 of the technical solution of this application, is mainly composed of aluminum, the detection trace 400 in the metal layer 50 under the organic planarization layer 40 undergoes electrochemical corrosion, causing the detection trace 400 to break. At the same time, bulging also occurs between the metal layer 50 and the organic planarization layer 40.

[0062] Therefore, this solution replaces a portion of the detection trace 400 in the fan-out area 210, namely the second trace segment 420 of the detection trace 400, with the shielding metal layer 04. This allows the inorganic film layer above the shielding metal layer 04 to act as a water barrier, thereby preventing moisture from entering the detection trace 400 of the crack detection circuit and preventing the detection trace 400 from breaking due to electrochemical corrosion, which would cause electrical failure of the detection trace 400.

[0063] The specific embodiments of this application have been described in detail above. The embodiments disclosed above are merely preferred embodiments of this application. Those skilled in the art can make many modifications and improvements without departing from the concept of this application. All such modifications and improvements fall within the scope of protection defined by the claims of this application.

Claims

1. A display panel, characterized in that, The display panel includes a display area and a non-display area. The non-display area includes a fan-out area and a bent area. The bent area is located on the side of the fan-out area away from the display area. The display panel includes a substrate and an active layer disposed on the substrate, and the display panel further includes: Multiple fan-out traces are provided in the fan-out area, and the film layer where the fan-out traces are located is located above the film layer where the active layer is located. At least one detection trace, at least a portion of which is disposed in the fan-out area, the detection trace includes a first trace segment and a second trace segment, the first trace segment being located on a film layer above the active layer, the second trace segment being located between the substrate and the active layer, the first trace segment and the second trace segment being electrically connected, and in a top view of the display panel, the second trace segment partially overlaps with the fan-out trace; Multiple first connecting lines, at least a portion of which are disposed in the bending region, the film layer containing the first connecting lines being located above the film layer containing the fan-out traces, and the first connecting lines and the fan-out traces being electrically connected via a first connecting portion penetrating between the first connecting lines and the fan-out traces; and At least one second connecting line, at least a portion of the second connecting line is disposed in the bending area, the film layer in which the second connecting line is located is located above the film layer in which the first trace segment is located, and the second connecting line and the second trace segment are electrically connected through a second connecting portion passing through the second connecting line and the second trace segment; The voltage value of the signal transmitted by the second connecting line is different from the voltage value of the signal transmitted by the first connecting line. The signal transmitted by the second connecting line is a high-potential voltage signal, while the signal transmitted by the first connecting line is a low-potential voltage signal. The detection trace is a crack detection trace.

2. The display panel according to claim 1, characterized in that, The display panel further includes a shielding metal layer, a first metal layer, and a second metal layer disposed on the substrate. The film layer containing the shielding metal layer is located below the film layer containing the active layer, the film layer containing the first metal layer is located above the film layer containing the active layer, and the film layer containing the second metal layer is located above the film layer containing the first metal layer. The second trace segment is located in the film layer where the shielding metal layer is located, and the first trace segment is located in the film layer where the first metal layer or the second metal layer is located.

3. The display panel according to claim 2, characterized in that, The display panel further includes a third metal layer, and the film layer containing the third metal layer is located on the film layer containing the second metal layer; The second connecting line is located in the film layer where the third metal layer is located. The second connecting line is electrically connected to the second trace segment by segment through a first via in the film layer between the third metal layer and the shielding metal layer.

4. The display panel according to claim 3, characterized in that, The first connecting line is located in the film layer where the third metal layer is located, and the fan-out trace is located in the film layer where the first metal layer is located. The first connecting line is electrically connected to the fan-out trace through a second via that penetrates the film layer between the third metal layer and the first metal layer.

5. The display panel according to claim 3, characterized in that, The first connecting line is located in the film layer where the third metal layer is located, and the fan-out trace is located in the film layer where the second metal layer is located. The first connecting line is electrically connected to the fan-out trace through a third via that penetrates the film layer between the third metal layer and the second metal layer.

6. The display panel according to claim 2, characterized in that, The first trace segment is located in the film layer where the first metal layer is located, and the first trace segment is electrically connected to the second trace segment through a fourth via that penetrates the film layer between the first metal layer and the shielding metal layer.

7. The display panel according to claim 2, characterized in that, The first trace segment is located in the film layer where the second metal layer is located, and the first trace segment is electrically connected to the second trace segment through a fifth via that penetrates the film layer between the second metal layer and the shielding metal layer.

8. The display panel according to claim 1, characterized in that, The second trace segment is located in the fan-out area.

9. The display panel according to claim 1, characterized in that, The angle between the straight line containing the second routing segment and the straight line containing the fan-out routing is less than or equal to 45 degrees.

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