CN111862811A

CN111862811A - Display panel and display device

Info

Publication number: CN111862811A
Application number: CN202010693900.4A
Authority: CN
Inventors: 程江坤
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2020-10-30
Also published as: WO2022011918A1

Abstract

The application provides a display panel, including crack detection circuitry with by the detection layer, crack detection circuitry includes: a test end; the first metal routing comprises a first end and a second end which are connected with the testing end and a first metal routing body, and the first metal routing body is connected between the first end and the second end; the second metal routing is arranged on the first metal routing, and comprises a third end, a fourth end and a second metal routing body, and the second metal routing body is connected between the third end and the fourth end; the detected layer is located between the first metal wire and the second metal wire.

Description

Display panel and display device

Technical Field

The application relates to the technical field of display panels, in particular to a display panel and a display device.

Background

As people enter the information interconnection era, the demand of human-computer interaction is increased explosively, and the flat panel display technology is the most widely applied human-computer information exchange mode at present. The display panel has a multi-layer structure including inorganic material layers, metal material layers, and the like, and the inorganic layers are prone to stress concentration and micro cracks (cracks) which may cause line breakage in the display panel when the cracks are enlarged during coating, packaging, cutting, assembling, transporting, and the like in the manufacturing process of the display panel. Particularly, with the development of flexible and bendable display technology, the risk of breaking the lines in the display panel is increasingly prominent, and how to detect micro cracks in the inorganic material layer before the lines are broken is the primary task of preventing the lines from breaking.

Disclosure of Invention

The embodiment of the application provides a display panel provided with a crack detection circuit, which can detect micro cracks in a detected layer in the display panel, in particular micro cracks in an inorganic material layer.

The application provides a display panel, including crack detection circuitry and detected layer, crack detection circuitry includes:

a test end;

the first metal wire comprises a first end and a second end which are connected with the testing end and a first metal wire body, and the first metal wire body is connected between the first end and the second end; and

the second metal routing is arranged on the first metal routing line and comprises a third end, a fourth end and a second metal routing body, and the second metal routing body is connected between the third end and the fourth end; wherein the detected layer is located between the first metal trace and the second metal trace.

In the display panel of the present application, the ductility of the detected layer is weaker than the first metal trace and the second metal trace.

In the display panel of the present application, the first metal routing body and the second metal routing body surround the display area of the display panel.

In the display panel of the present application, the layer to be detected includes an inorganic layer.

In the display panel of the present application, the crack detection circuit is located in a non-display area of the display panel.

In the display panel of the present application, the test terminal includes a first input terminal, a first output terminal, a second input terminal, and a second output terminal, wherein the first input terminal is used for inputting a first input signal to the first terminal, the first output terminal is used for receiving a first output signal through the second terminal, the second input terminal is used for inputting a second input signal to the third terminal, the second output terminal is used for receiving a second output signal through the fourth terminal, and the first output signal and the second output signal are used for detecting whether the detected layer has a crack.

In the display panel of the present application, the test terminal includes a chip or a test point.

In the display panel of the present application, the display panel includes a substrate, and an orthogonal projection of the first metal routing body perpendicular to the substrate is at least partially overlapped with an orthogonal projection of the second metal routing body perpendicular to the substrate.

In the display panel of the present application, the first metal routing body and the second metal routing body are made of the same or different materials.

The application also provides a display device which comprises any one of the display panels.

The beneficial effect of this application does: the display panel is provided with a crack detection circuit, the crack detection circuit comprises a first metal wire, a second metal wire and a detected layer clamped between the first metal wire and the second metal wire, a capacitor is formed between the first metal wire and the second metal wire, detection signals are respectively applied to the first metal wire and the second metal wire, the state of a channel between the two metal wires and the state of a capacitance value are detected, whether fine cracks exist in the detected layer in the display panel can be judged, and the display panel with the cracks is screened in advance to avoid flowing into a user side.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic top view of a display panel according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of a crack detection circuit according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a display device according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1 and fig. 2, fig. 2 is a cross-sectional view of an AB broken line in fig. 1, an embodiment of the present application provides a display panel 100, including a crack detection circuit 80 and a layer to be detected 30, where the crack detection circuit 80 includes: a test end 90; a first metal trace 10, the first metal trace 10 including a first end 12 and a second end 13 connected to the test end 90 and a first metal trace body 11, the first metal trace body 11 being connected 13 between the first end 12 and the second end; the second metal wire 20 is arranged on the first metal wire 10, the second metal wire 20 comprises a third end 22, a fourth end 23 and a second metal wire body 21, and the second metal wire body 21 is connected between the third end 22 and the fourth end 23; wherein, the detected layer 30 is located between the first metal trace 10 and the second metal trace 20.

The embodiment of the application sets up crack detection circuit 80 at display panel 100, crack detection circuit 80 includes that first metal walks line 10 and second metal and walks line 20 to and press from both sides and locate detected layer 30 between first metal walks line 10 and second metal and walk line 20, form the electric capacity between first metal walks line 10 and second metal and walk line 20, walk line 10 and second metal and walk line 20 and exert the detected signal respectively, the route state between two metal walks, the capacitance value situation, thereby can judge whether there is tiny crackle by detected layer 30 in the display panel, screen out the display panel who has the crackle in advance and avoid flowing into the user side.

Specifically, referring to fig. 1 and fig. 2, in some embodiments, the display panel 100 includes a display area 110 and a non-display area 120, the crack detection circuit 80 is disposed on the display panel 100, the crack detection circuit 80 includes a first metal trace 10, a second metal trace 20, a detected layer 30 and a test end 90, the test end 90 is disposed in the non-display area 120, and the detected layer 30 is sandwiched between the first metal trace 10 and the second metal trace 20. The first metal trace 10 includes a first end 12 and a second end 13 connected to or extended from the testing end 90, and a first metal trace body 11, wherein the first metal trace body 11 is connected between the first end 12 and the second end 13; the second metal trace 20 is disposed on the first metal trace 10, the second metal trace 20 includes a third end 22, a fourth end 23 and a second metal trace body 21, and the second metal trace body 21 is connected between the third end 22 and the fourth end 23.

In some embodiments, the ductility of the detected layer 30 is weaker than the first metal trace 10 and the second metal trace 20. When the first metal trace 10, the detected layer 30, and the second metal trace 20 are stacked, since the ductility of the detected layer 30 is weaker than that of the first metal trace 10 and the second metal trace 20, the detected layer 30 will crack or break before the first metal trace 10 and the second metal trace 20, and thus the first metal trace 10 and the second metal trace 20 can detect the crack or break in the detected layer 30.

In some embodiments, referring to fig. 1, the first metal trace body 11 and the second metal trace body 21 surround the display area 110 of the display panel 100. For example, the first metal routing body 11 and the second metal routing body 21 are disposed in the non-display area 120, and disposed around the display area 110 of the display panel 100, and connected or extended to the testing terminal 90 at a frame position of the display panel 100.

In some embodiments, the detected layer 30 includes an inorganic layer, which is a brittle material, has poor ductility, is prone to crack and fracture, and can cause various metal lines in the display panel 100 to fracture when the crack and fracture are enlarged, thereby causing poor display, and the crack and fracture in the inorganic layer can be detected in time by the crack detection circuit 80, so as to prevent the crack and fracture from extending or spreading to the metal lines, thereby preventing the defective product from flowing out. The microcracks 70 are illustrated in fig. 2, and the presence of the microcracks 70 is detected and the microcracks 70 are prevented from propagating into the lines in the display panel 100. In some embodiments, the inorganic layer included in the detected layer 30 may extend from the display area 110 to the non-display area 120, and when the detected layer 30 detects a crack in the crack detection circuit 80, it shows that the reliability of the display panel 100 has been reduced, not only the crack in the crack detection circuit 80 will propagate to the display area 110, but also the inorganic layer in the display area 110 has cracks at a high probability, and the display panel 100 whose crack is detected needs to be screened out in advance to avoid flowing into the user terminal.

In some embodiments, referring to fig. 1, the crack detection circuit 80 is located in the non-display area 120 of the display panel 100, so as to prevent the crack detection circuit 80 from occupying the area of the display area.

In some embodiments, the test terminal 90 includes a first input terminal for inputting a first input signal to the first terminal, a first output terminal for receiving a first output signal through the second terminal, a second input terminal for inputting a second input signal to the third terminal, and a second output terminal for receiving a second output signal through the fourth terminal, wherein the first output signal and the second output signal are used for detecting whether the detected layer has cracks. Specifically, for example, the first terminal 12 may be a first input terminal or a first input terminal near the first terminal 12, the second terminal 13 may be a first output terminal or a first output terminal near the second terminal 13, the third terminal 22 may be a second input terminal or a second input terminal near the third terminal 22, and the fourth terminal 23 may be a second output terminal or a second output terminal near the fourth terminal 23, but is not limited thereto. The capacitance is formed between the first metal wire 10 and the second metal wire 20, the detection signals are respectively input through the first input end and the second input end, and the detection signals are respectively output through the first output end and the second output end, so that the path state and the capacitance value condition between the first metal wire 10 and the second metal wire 20 can be detected, whether fine cracks exist in the detected layer 30 in the display panel 100 can be judged, and the display panel with cracks is screened in advance to avoid flowing into a user end.

In some embodiments, test terminal 90 includes a chip 160 or a test point. Specifically, the manner of inputting the signals at the test terminal 90 to the first input terminal and the second input terminal may be the chip 160 or the test point, the manner of outputting the signals at the test terminal 90 to the first output terminal and the second output terminal may be the chip 160 or the test point, and the test point may be in the form of a pad, a test metal block, or the like, but is not limited thereto.

In some embodiments, referring to fig. 2, the display panel 100 includes a substrate 60, and an orthogonal projection of the first metal trace body 11 perpendicular to the substrate 60 and an orthogonal projection of the second metal trace body 21 perpendicular to the substrate 60 at least partially overlap. The first metal trace body 11 and the second metal trace body 21 have partial positive opposite portions, or the first metal trace body 11 and the second metal trace body 21 have all positive opposite portions.

In some embodiments, the display panel 100 includes a substrate 60, an orthogonal projection of the first metal routing body 11 perpendicular to the substrate 60 and an orthogonal projection of the second metal routing body 21 perpendicular to the substrate 60 may not overlap, for example, the orthogonal projection of the first metal routing body 11 perpendicular to the substrate 60 and the orthogonal projection of the second metal routing body 21 perpendicular to the substrate 60 are adjacent but do not overlap, at this time, a capacitor may also be formed between the first metal routing body 11 and the second metal routing body 21, a detection signal is respectively applied to the first metal routing 10 and the second metal routing 20, a state of a path between the two metal routing and a state of a capacitance are detected, so as to determine whether a detected layer 30 in the display panel has a fine crack, and the display panel with cracks is screened in advance to avoid flowing into a user terminal.

In some embodiments, the width of the first metal trace body 11 is equal to the width of the second metal trace body 21. In some embodiments, the width of the first metal trace body 11 is not equal to the width of the second metal trace body 21, for example, the width of the first metal trace body 11 is greater than the width of the second metal trace body 21.

In some embodiments, the layer 30 to be detected may include two or more inorganic layers.

In some embodiments, the inspected layer 30 may also include an organic layer, for example, the inspected layer 30 includes an organic layer and an inorganic layer, and the organic layer may be a transparent resin of a flat layer.

In some embodiments, referring to fig. 2, the materials of the first metal trace body 11 and the second metal trace body 21 are the same or different. Whether the materials of the first metal trace body 11 and the second metal trace body 21 are the same or not is not limited herein, and whether the ductility of the materials of the first metal trace body 11 and the second metal trace body 21 are the same or not is not limited herein. For example, the material of the first metal trace body 11 is Mo, the material of the second metal trace body 21 is Mo, for example, the material of the first metal trace body 11 is Mo, and the material of the second metal trace body 21 is Al.

In some embodiments, the display area 110 includes a gate driving trace and a data driving trace, the first metal trace body 11 and the gate driving trace are formed of the same layer of metal, and the second metal trace body 21 and the data driving trace are formed of the same layer of metal.

In some embodiments, the display region 110 includes a gate driving trace and an anode metal layer, the first metal trace body 11 and the gate driving trace are formed of the same layer of metal, and the second metal trace body 21 and the anode metal layer are formed of the same layer of metal.

In some embodiments, referring to fig. 2, other layer structures may be further included between the first metal trace 10 and the substrate, for example, the layer structure 40 is an inorganic layer or other layer structures. Other layer structures may be further included on the second metal trace 20, for example, the layer structure 50 is an organic layer or other layer structures, but is not limited thereto.

Referring to fig. 3, the display device 1000 includes any one of the display panels 100, and the display device 1000 may further include other portions 600, such as a driving system, a housing, and the like.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above embodiments of the present application are described in detail, and specific examples are applied in the present application to explain the principles and implementations of the present application, and the description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A display panel comprising a crack detection circuit and a layer to be detected, the crack detection circuit comprising:

a test end;

2. The display panel of claim 1, wherein the detected layer is less malleable than the first metal trace and the second metal trace.

3. The display panel of claim 1, wherein the first metal trace body and the second metal trace body surround a display area of the display panel.

4. The display panel of claim 2, wherein the detected layer comprises an inorganic layer.

5. The display panel of claim 1, wherein the crack detection circuit is located in a non-display area of the display panel.

6. The display panel of claim 1, wherein the test terminal comprises a first input terminal for inputting a first input signal to the first terminal, a first output terminal for receiving a first output signal through the second terminal, a second input terminal for inputting a second input signal to the third terminal, and a second output terminal for receiving a second output signal through the fourth terminal, wherein the first output signal and the second output signal are used for detecting whether the layer under test has a crack.

7. The display panel of claim 1, wherein the test terminals comprise chips or test points.

8. The display panel of claim 1, wherein the display panel comprises a substrate, and an orthogonal projection of the first metal trace body perpendicular to the substrate at least partially overlaps an orthogonal projection of the second metal trace body perpendicular to the substrate.

9. The display panel of claim 1, wherein the first metal trace body and the second metal trace body are made of the same or different materials.

10. A display device comprising the display panel according to any one of claims 1 to 9.