Display panel and display device

Abstract

The utility model provides a display panel and a display device. Comprising an integrated circuit at least arranged in the non-display area and an electrostatic protection circuit arranged in the non-display area. The electrostatic protection circuit comprises a test terminal and a one-way conduction device, the integrated circuit comprises an input terminal and an output terminal, one end of the one-way conduction device is electrically connected with the test terminal, and the other end of the one-way conduction device is electrically connected with the output terminal of the integrated circuit. When the display panel is detected in the manufacturing process of the display panel, the input end and the output end of a provided detection signal can respectively provide different positive and negative voltages, and when the positive detection voltage is connected with the positive end of the one-way conduction device, normal detection can be carried out, and instantaneous charges generated in the detection process can be effectively avoided; and when the positive detection voltage is connected with the negative end of the conduction device, the electrostatic protection circuit does not work so as to avoid formation of static electricity. Therefore, the influence of static electricity generated during detection on the performance of the panel is effectively avoided.

Description

Technical Field

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

[0002] With the continuous development and improvement of display technology, people have put forward higher requirements on the display quality and effects of display panels to enhance the user experience.

[0003] The display industry is developing rapidly, and new display panels and display mode devices are constantly emerging. The traditional liquid crystal display panel (Liquid Crystal Display, LCD) industry has become increasingly saturated and the development speed has gradually slowed down. However, the organic light-emitting diode display panel (Organic Light-Emitting Diode, OLED) has occupied most of the high-end products in the small size field and has developed rapidly. In the process of preparing the OLED display panel, it is necessary to go through a variety of different processes to ensure the product's quality rate. Common processing procedures include detection and lighting processes, and the connectivity of the internal circuit of the panel is detected during the process to avoid defective products from flowing into the back stage and increasing the number of defective products. In the prior art, by setting an array substrate detection (array test, AT) circuit, a test signal is connected to the detection circuit. In the process of connecting the test signal, a large amount of charge is easily accumulated in the panel. These accumulated charges will be transmitted to the display panel along the signal routing, such as to the control chip or other components of the panel, thereby causing electrostatic damage to the control chip and increasing the defective rate of the product.

[0004] In summary, during the inspection and lighting process of existing display panels, it is easy to cause charge accumulation inside the panel when it is inspected, which in turn leads to the risk of explosion of components inside the panel, reducing the quality stability of the panel. Utility Model Content

[0005] The embodiments of the utility model provide a display panel and a display device, which can effectively improve the problem in the prior art that charge accumulation is easy to occur during the detection and lighting process of the panel, thereby causing the risk of explosion of components inside the panel.

[0006] In order to solve the above technical problems, a first aspect of an embodiment of the utility model provides a display panel, including a display area and a non-display area arranged on one side of the display area, including:

[0007] An integrated circuit input terminal is arranged in the non-display area;

[0008] an integrated circuit output terminal, disposed in the non-display area, the integrated circuit output terminal being located on a side of the integrated circuit input terminal close to the display area; and

[0009] An electrostatic protection circuit is arranged in the non-display area;

[0010] The electrostatic protection circuit at least includes a test terminal and a unidirectional conductive device, one end of the unidirectional conductive device is electrically connected to the test terminal, and the other end of the unidirectional conductive device is electrically connected to the integrated circuit output terminal.

[0011] According to an embodiment of the utility model, the unidirectional conducting device includes a first connection end and a second connection end, the first connection end is electrically connected to the integrated circuit output terminal, and the second connection end is electrically connected to the test terminal.

[0012] According to an embodiment of the utility model, the electrostatic protection circuit further includes a test trace, the test terminal is electrically connected to the second connection end through the test trace, and the test terminal is arranged on one side of the unidirectional conductive device.

[0013] According to an embodiment of the present invention, the first connection end is set as a positive electrode, and the second connection end is set as a negative electrode.

[0014] According to an embodiment of the present invention, the unidirectional conductive device is disposed between the output terminal and the input terminal, and the test terminal and the unidirectional conductive device are disposed side by side.

[0015] According to an embodiment of the present invention, the unidirectional conducting device includes any one of a diode and a unidirectional switch.

[0016] According to an embodiment of the present invention, the display panel further includes a plurality of electrostatic shielding units, the electrostatic shielding units are disposed on a side of the test circuit close to the display area, and the electrostatic shielding units are electrically disposed on the signal traces.

[0017] According to an embodiment of the present invention, in the non-display area, the unidirectional conductive device further includes:

[0018] A substrate, a semiconductor layer arranged on the substrate, a test trace arranged on a side of the semiconductor layer away from the substrate, a first metal layer arranged on both sides of the semiconductor layer and away from the substrate, and a planarization layer arranged on the first metal layer, and the first metal layer is electrically connected to the semiconductor layer and the test trace.

[0019] According to an embodiment of the present invention, in the display area, the display panel further includes an active layer, and the semiconductor layer of the unidirectional conductive device is arranged in the same layer as the active layer.

[0020] According to a second aspect of the embodiment of the utility model, a display device is further provided, and the display device includes the display panel provided in the embodiment of the utility model.

[0021] Beneficial effects of the embodiments of the utility model: Compared with the prior art, the embodiments of the utility model provide a display panel and a display device. The display panel includes an integrated circuit at least arranged in a non-display area, and an electrostatic protection circuit arranged in the non-display area. Among them, the electrostatic protection circuit includes a test terminal and a unidirectional conductive device, and the integrated circuit includes an input terminal and an output terminal, one end of the unidirectional conductive device is electrically connected to the test terminal, and the other end is electrically connected to the integrated circuit output terminal. Since the unidirectional conductive device is provided in the utility model, when the display panel is detected in the process, the input end and the output end of the provided detection signal can provide different positive and negative voltages respectively, and when the positive detection voltage is connected to the positive end of the unidirectional conductive device, it can be detected normally and effectively avoid the instantaneous charge generated during the detection process, and when the positive detection voltage is connected to the negative end of the conductive device, the electrostatic protection circuit does not work and thus avoids the formation of static electricity. Thereby effectively avoiding the influence of static electricity generated when the panel is detected on the performance of the panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic plan view of a display panel provided in an embodiment of the utility model

[0024] Figure 2 In the embodiment of the utility model Figure 1 The enlarged schematic diagram of the area A corresponding to the lower frame area of ​​the display panel provided in

[0025] Figure 3 Schematic diagram of the arrangement of the electrostatic protection circuit provided in the embodiment of the utility model

[0026] Figure 4 A schematic diagram of the structure of the diode in the lower frame area provided in the embodiment of the utility model

[0027] Figure 5A schematic diagram of the structure of a display device provided in an embodiment of the utility model;

[0028] Figure 6 A schematic structural diagram of a display device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0029] In the following detailed description, only certain embodiments of the present invention are shown and described simply by way of illustration. As will be appreciated by those skilled in the art, the embodiments described herein may be modified in various ways without departing from the spirit or scope of the present invention.

[0030] In the drawings, the thickness of layers, films, panels, regions, etc. may be exaggerated for clarity and for better understanding and ease of description. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on another element," it can be directly on the other element or intervening elements may also be present.

[0031] In addition, unless explicitly described to the contrary, the word "comprise" and its variations like "include" or "contain" will be understood to imply the inclusion of the discussed elements, but not necessarily the exclusion of other elements. Further, in the specification, the word "on..." refers to placement above or below an object part, and does not necessarily mean placement on the upper side of an object part based on the direction of gravity.

[0032] It will be understood that, although the terms "first", "second", etc. may be used herein to describe various components, these components should not be limited by these terms. These components are only used to distinguish one component from another component.

[0033] The utility model provides a display panel and a display device in an embodiment, wherein an electrostatic protection circuit is set in a non-display area of ​​the display panel, thereby effectively avoiding the problem that static electricity is likely to occur during panel testing and thus affects the performance of the panel.

[0034] like Figure 1 As shown, Figure 1 It is a plan view of a display panel provided in an embodiment of the utility model. The display panel includes a display area 20 and a non-display area 21, wherein the non-display area 21 is arranged on at least one side of the display area 20. In the following embodiments, the non-display area 21 is arranged around the display area 20. In this case, the non-display area 21 may be a border area of ​​the display panel. And the border area may include an upper frame area and a lower frame area arranged at the upper and lower positions of the display area 20, and a left frame and a right frame area arranged at the left and right positions of the display area 20. Optionally, the lower frame area may be a binding area of ​​the display panel, and the binding of the panel is realized through the binding area.

[0035] Furthermore, when preparing the lower border area corresponding to the non-display area 21, during the preparation process, a detection circuit AT (array test) 101 and a lighting test circuit CT (cell test) 103 are usually provided in the lower border area. The connectivity of the internal components of the panel can be detected with the help of the above-mentioned detection and test circuits to avoid the occurrence of defective products.

[0036] In the embodiment of the utility model, by improving the circuit structure in the lower frame area, the risk of electrostatic charge being easily transmitted to the panel and causing device explosion during the detection and testing of the display panel can be effectively avoided.

[0037] like Figure 2 As shown, Figure 2 In the embodiment of the utility model Figure 1 An enlarged schematic diagram of the area A corresponding to the lower frame area of ​​the display panel provided in .

[0038] Combination Figure 1 When the display panel is provided, the display panel at least includes a plurality of signal lines 104 arranged in the lower frame area. Optionally, the plurality of signal lines 104 may extend from the display area of ​​the display panel, or extend from the left frame area and the right frame area on both sides to the lower frame area. At the same time, a test circuit 103, an electrostatic shielding unit 102, an integrated circuit 30, and an electrostatic protection circuit 401 are also provided in the lower frame area.

[0039] Specifically, the test circuit 103 can be arranged on a side close to the display area, and the test circuit 103 includes a plurality of terminals. When it is necessary to test it in the process, such as a connectivity test or a lighting test, the external signal is connected to the corresponding terminal in the lighting test circuit to provide a test signal and implement the panel test. At the same time, an electrostatic shielding unit 102 is also arranged on the side of the test circuit 103 away from the display area. In the embodiment of the utility model, the electrostatic shielding unit 102 can be set to multiple, such as multiple resistors, and the multiple resistors can be directly arranged on each signal wiring 104, or arranged on one side of the signal wiring 104 and electrically connected to the signal wiring. When static electricity is generated during the test process, the excess static electricity can be directly transmitted to the shielding resistor, thereby avoiding the accumulation of static charge in the circuit.

[0040] Further, the integrated circuit 30 is arranged on a side of the test circuit 103 away from the display area, and the integrated circuit 30 may include multiple input terminals 301 and multiple output terminals 302. The output terminal 302 is arranged on a side close to the display area, and the input terminal 301 is arranged on a side of the output terminal 302 away from the display area. Optionally, the multiple input terminals 301 can be arranged in at least one row or multiple rows and arranged at intervals, and the multiple output terminals 302 can be arranged in at least one row or multiple rows and arranged at intervals. In the final product, each terminal of the integrated circuit 30 is electrically connected to the input terminal 301 and the output terminal 302 to form a normally working integrated circuit 30.

[0041] At the same time, when setting, the integrated circuit 30 is electrically connected to the corresponding signal trace 104. For example, the signal trace 104 is connected to the input terminal 301 or the output terminal 302 to achieve the purpose of electrical conduction and signal transmission. In the embodiment of the present application, in the subsequent process, other components need to be set on the input terminal 301 and the output terminal 302 to obtain a complete structure.

[0042] Furthermore, in the embodiment of the present invention, the electrostatic protection circuit 401 is electrically connected to the integrated circuit, and the electrostatic protection circuit 401 is correspondingly disposed at a reserved position between the input terminal 301 and the output terminal 302 of the integrated circuit 30 .

[0043] like Figure 3 As shown, Figure 3 The following is a schematic diagram of the arrangement of the electrostatic protection circuit provided in the embodiment of the utility model. Figure 2 In the structure of the utility model, in the embodiment of the present invention, the electrostatic protection circuit 401 at least includes a test trace 500, a test terminal 402 and a unidirectional conductive device 403, and the unidirectional conductive device 403 is electrically connected to the output terminal 302 of the integrated circuit through the test trace 500.

[0044] Specifically, when the one-way conducting device 403 is provided, it includes a first connection end 4031 and a second connection end 4032. The first connection end 4031 is provided on a side close to the display area, and the second connection end 4032 is provided on a side of the first connection end 4031 away from the display area. When provided, the first connection end and the second connection end may be provided on the same straight line, such as a line connecting the first connection end 4031 and the second connection end 4032 and the second direction Y are parallel to each other. Figure 3 The second direction Y may be a vertical direction, and the first direction X may be a horizontal direction. Both the vertical and horizontal directions are defined and limited with reference to the plane where the display area is located.

[0045] Furthermore, the first connection end 4031 is electrically connected and conducted with the output terminal 302 of the integrated circuit through the test trace 500. Meanwhile, when the unidirectional conductive device 403 is provided, the unidirectional conductive device 403 can be provided at a corresponding position between two adjacent output terminals 302 in the second direction, thereby optimizing the arrangement space of the components in the lower frame area.

[0046] In an embodiment of the present application, when setting a test line between the first connection terminal 4031 and the integrated circuit output terminal 302, it may include a first line segment 501 and a second line segment 502. In order to achieve the setting of a narrow-border panel as much as possible and reduce the impedance of the panel line, in an embodiment of the present application, the first line segment 501 can be set parallel to the second direction Y, and the second line segment can be set parallel to the first direction X, thereby optimizing the arrangement structure of the test line and improving the performance of the panel.

[0047] In the embodiment of the utility model, the multiple test terminals 402 of the electrostatic protection circuit 401 are correspondingly arranged on one side of the unidirectional conductive device 403. Optionally, the test terminals 402 are all correspondingly arranged on the same side as the unidirectional conductive device 403, and the test terminals 402 can be arranged on the left side of the unidirectional conductive device 403, or according to different product structures, the test terminals 402 are arranged at the corresponding position below the unidirectional conductive device 403 and arranged side by side. In this way, after the setting is completed, the test terminals 402 and the corresponding unidirectional conductive devices 403 are arranged in sequence in the lower frame area. In the embodiment of the utility model, by limiting the arrangement mode and arrangement position of the test terminals 402 and the unidirectional conductive device 403, the problem of mutual influence between different components is avoided, and at the same time, it can also effectively save space and realize the narrow frame design of the panel.

[0048] Further, when multiple test terminals 402 are provided, the length of the test terminals 402 is greater than the length of the corresponding unidirectional conductive device 403. At the same time, in order to improve the connection efficiency and stability during the test, in the embodiment of the utility model, the ratio between the length and the width of the test terminal 402 is set to 1-2, such as the length of the test terminal 402 is twice the width. In this way, while ensuring the normal arrangement of multiple test terminals 403, the area of ​​the test terminal 403 can be increased as much as possible, and by increasing the area of ​​the test terminal 403, the impedance during the test process can be reduced, and the stability of the signal transmission during the test process can be improved. Optionally, the length of the test terminal 403 can be set to other numerical ratios relative to the width, and its different design schemes are all within the protection scope of the utility model.

[0049] In the embodiment of the utility model, in the process of preparing the display panel, when the display panel is tested or lit, the external signal is connected to the test terminal 402 in the electrostatic protection circuit, and the test terminal 402 is electrically connected to the second connection end 4032 of the unidirectional conductive device 403 through the test wiring 500, so that the external signal will continue to be transmitted to the unidirectional conductive device 403. In the example of the utility model, the unidirectional conductive device 403 only allows a specific current to pass.

[0050] Specifically, during the process detection, when the external test signal provided is a negative voltage, the test signal is electrically connected to the second connection terminal 4032, and when the external test signal is a positive voltage, the test signal is connected to the first connection terminal 4031. Correspondingly, when the first connection terminal of the unidirectional conductive device 403 is connected to a positive voltage, the unidirectional conductive device 403 can be normally turned on, and when the first connection terminal is connected to a negative voltage, the unidirectional conductive device 403 cannot be turned on, so that through its unidirectional conductive characteristic, on the one hand, the normal conduction of its test can be guaranteed, and on the other hand, the influence of the test signal connection error on the panel during the test can be avoided.

[0051] At the same time, due to its unidirectional conductivity, during the test process, the unidirectional conductive device 403 can also intercept and prevent the instantaneous charge generated inside the circuit, thereby reducing the accumulation of instantaneous charge during the test process and avoiding the problem of charge being transmitted to the inside of the panel and causing damage to the device.

[0052] Furthermore, the unidirectional conductive device 403 may include any one of a diode, a unidirectional switch or a unidirectional conductive resistor, and the unidirectional conductive effect of the current is achieved through the above components. In the following embodiments, the unidirectional conductive device 403 is set as a diode, and its first connection terminal 4031 is the positive end of the diode, that is, the positive pole, and the second connection terminal 4032 is the negative end of the diode, that is, the negative pole. In this way, when the external signal is positive and connected to the first connection terminal 4031, the electrostatic protection circuit and the internal components of the panel can be connected, and the purpose of normal testing can be achieved, otherwise the detection cannot be performed. At the same time, through the unidirectional conductivity of the diode, the problem of access error during the detection process can be effectively avoided, and the instantaneous charge generated during the detection process can be effectively intercepted by the diode, thereby ensuring the stability and reliability of the panel during testing.

[0053] Further, such as Figure 4 As shown, Figure 4 for Figure 3 In the embodiment of the present application, an electrostatic protection circuit is provided, and a diode is provided accordingly. The corresponding circuit is shown in Figure 4In the circuit, the lower end of the transistor corresponds to the test terminal 402 in the present application. When voltages of different polarities are connected to the corresponding terminals, the diode can be driven to work normally only under the correct electrical correspondence, thereby ensuring stability during testing and avoiding the influence of static electricity.

[0054] In an embodiment of the utility model, when setting the diode, the width of the diode can be set to be greater than or equal to 2 microns. In this way, while ensuring the performance of the diode, the purpose of saving arrangement space is achieved, thereby realizing the preparation of small-size integrated circuits and narrow-border panels.

[0055] Further, such as Figure 5 As shown, Figure 5 The schematic diagram of the structure of the diode in the lower frame area provided in the embodiment of the utility model. Figure 1 The planar structure of the panel in the embodiment of the present invention, when setting the display panel, the display panel includes an array substrate respectively arranged in the display area and the non-display area, and in the display area, the array substrate includes a substrate 601 and a plurality of thin film transistors arranged on the substrate, and the thin film transistors may include an active layer, a source-drain metal layer and a gate layer, and the above-mentioned thin film transistors and their corresponding electrode structures may be arranged according to the existing structure, specifically, the active layer is arranged on the substrate 601, the gate insulation is arranged on the active layer, and the source-drain metal layer is arranged on the active layer and is electrically connected to the active layer through vias. This example is generally Figure 5 Only the film layer structure of the array substrate in the non-display area is illustrated.

[0056] See Figure 5 In the embodiment, when setting the diode structure in the non-display area, the diode includes a substrate 601, an insulating layer 602, a semiconductor layer 608, a first metal layer 610, a second metal layer 609, and a first dielectric layer 603 and a second dielectric layer 604 arranged between the functional layers, and a first planarization layer 606 and a second planarization layer 607 arranged on the first metal layer 610.

[0057] Combination Figure 3Specifically, the first metal layer 610 of the diode is also electrically connected to the semiconductor layer 608 below through the corresponding vias, and the second metal layer 609 is insulated and arranged above the semiconductor layer 608. In the embodiment of the utility model, the semiconductor layer 608 of the diode can be arranged in the same layer as the active layer of the thin film transistor in the display area of ​​the display panel, and the same material is used, thereby simplifying the preparation process of the panel. At the same time, the first metal layer 610 of the diode can be arranged in the same layer as the source and drain metal layer of the thin film transistor in the display area of ​​the display panel. In the embodiment of the utility model, the second metal layer 609 and the scanning signal line in the display area can be prepared and formed in the same layer, that is, the second metal layer 609 is actually a test trace 500 of a unidirectional conductive device, and the signal transmission is realized through the second metal layer 609.

[0058] Furthermore, in the embodiment of the present invention, when making a connection, one of the first metal layers 610 of the diode is electrically connected to the second connection terminal 4032, and another electrode in the first metal layer 610 of the diode is electrically connected to the first connection terminal 4031. For example, the source of the diode is electrically connected to the second connection terminal 4032, and the drain of the diode is electrically connected to the first connection terminal 4031. Thus, the diode structure provided in the embodiment of the present invention is prepared, the preparation process is simplified, and the normal transmission of the test signal is ensured during the test process.

[0059] like Figure 6 As shown, Figure 6 The present invention is a schematic diagram of the structure of a display device provided in an embodiment of the present invention, wherein the display device includes a frame 200 and a display module 100, wherein the display module 100 is disposed on the frame 200, and the display module 100 may include a display panel provided in any of the above embodiments, and the display device may be, but is not limited to, display devices such as smart phones, smart watches, desktop computers, laptop computers, and televisions.

[0060] In summary, the display panel and display device provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present invention. Although the present invention is disclosed as above in the preferred embodiments, the above preferred embodiments are not used to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is based on the scope defined by the claims.

Claims

1. A display panel, characterized in that: The display panel includes a display area and a non-display area arranged on one side of the display area, and the display panel further includes: An integrated circuit input terminal is arranged in the non-display area; an integrated circuit output terminal, disposed in the non-display area, the integrated circuit output terminal being located on a side of the integrated circuit input terminal close to the display area; and An electrostatic protection circuit is arranged in the non-display area; The electrostatic protection circuit at least includes a test terminal and a unidirectional conductive device, one end of the unidirectional conductive device is electrically connected to the test terminal, and the other end of the unidirectional conductive device is electrically connected to the integrated circuit output terminal.

2. The display panel according to claim 1, characterized in that: The unidirectional conducting device includes a first connection end and a second connection end, wherein the first connection end is electrically connected to the integrated circuit output terminal, and the second connection end is electrically connected to the test terminal.

3. The display panel according to claim 2, characterized in that: The electrostatic protection circuit further includes a test trace, the test terminal is electrically connected to the second connection end through the test trace, and the test terminal is arranged on one side of the unidirectional conductive device.

4. The display panel according to claim 2, characterized in that: The first connection end is set as a positive electrode, and the second connection end is set as a negative electrode.

5. The display panel according to claim 1, characterized in that: The one-way conducting device is arranged between the output terminal and the input terminal, and the test terminal and the one-way conducting device are arranged side by side.

6. The display panel according to claim 1, characterized in that: The unidirectional conducting device includes any one of a diode and a unidirectional switch.

7. The display panel according to claim 1, characterized in that: The display panel further includes a plurality of electrostatic shielding units, wherein the electrostatic shielding units are arranged on a side of the test circuit away from the display area, and the electrostatic shielding units are electrically arranged on the signal wiring.

8. The display panel according to claim 1, characterized in that: In the non-display area, the unidirectional conductive device further includes: A substrate, a semiconductor layer arranged on the substrate, a test trace arranged on a side of the semiconductor layer away from the substrate, a first metal layer arranged on both sides of the semiconductor layer and away from the substrate, and a planarization layer arranged on the first metal layer, and the first metal layer is electrically connected to the semiconductor layer and the test trace.

9. The display panel according to claim 8, characterized in that: In the display area, the display panel further includes an active layer, and the semiconductor layer of the unidirectional conductive device is arranged in the same layer as the active layer.

10. A display device, characterized in that: The invention comprises a display panel as claimed in any one of claims 1 to 9.

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